CN103396774A - Plugging agent and preparation method thereof - Google Patents

Plugging agent and preparation method thereof Download PDF

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Publication number
CN103396774A
CN103396774A CN2013103471609A CN201310347160A CN103396774A CN 103396774 A CN103396774 A CN 103396774A CN 2013103471609 A CN2013103471609 A CN 2013103471609A CN 201310347160 A CN201310347160 A CN 201310347160A CN 103396774 A CN103396774 A CN 103396774A
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water
polymkeric substance
hydrophobic associated
soluble hydrophobic
plugging agent
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CN103396774B (en
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郭拥军
罗平亚
张新民
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Southwest Petroleum University
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Southwest Petroleum University
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Priority to PCT/CN2014/074235 priority patent/WO2015018203A1/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention discloses a plugging agent and a preparation method thereof. The plugging agent comprises a composition of a water-soluble hydrophobic associated polymer or a water-soluble hydrophobic associated polymer. The preparation method of the plugging agent is a copolymerization cohydrolysis method or a copolymerization posthydrolysis method. The plugging agent easily enters a leakage layer and has good viscoelasticity, so that the plugging agent can pass a throat and expand to fill a leakage crack and a solution cave space, meanwhile, can automatically stop flowing in the leakage layer and is unlikely to mix with oil, gas and water, thus a gel 'slug' with high viscosity and gel strength, which is capable of separating fluid in formation from fluid in a shaft, is formed; and the slug has enough starting pressure difference greater than the difference between the pressure of a mud column and the pressure of the formation fluid so as to achieve the purpose of plugging. The plugging agent and the preparation method thereof can be used for effectively solving various serious leakage and have good application value and social value.

Description

Plugging agent and preparation method thereof
Technical field
The present invention relates to the drilling technique field, particularly a kind of plugging agent and preparation method thereof.
Background technology
Leakage is in the extraordinary borehole operation processes such as drilling well, well cementation, test or well workover, various working fluids, comprise mud, grout, well finishing liquid and other liquid etc., under the effect of pressure reduction, missing a kind of down hole problem into stratum, is one of the most general modal technical barrier in the engineering of down-hole.
Leakage can be divided into Pyatyi be little leakage, little leakage, middle leakage by leaking speed, leak greatly, pernicious leakage, wherein pernicious leakage be the most serious be also the most scabrous leakage problem, mainly betide the hydrocarbon-bearing pool down-hole that has Fractured, solution cavity, broken formation.Pernicious leakage main manifestations is to pump into oil well working fluid in well to have into without going out to completely lose circulation.Usually can have into the severe leakage without going out when bore meeting solution cavity and larger natural fracture, sometimes bore while meeting the low stratum of long well section bearing capacity and also may have into the severe leakage without going out.
Pernicious leakage is severe leakage in the drilling process leakage, it not only can expend rig time, loses a large amount of drilling muds, and likely causes the series of complex situations such as bit freezing, blowout, well slough, even cause well to be scrapped, cause heavy economic losses and serious social influence.
For solving the leakage problem, in existing technology, main thinking is to inject patching materials, shutoff drop ply to drop ply, thereby solve the leak stopping problem, wherein the performance of patching materials is the key that determines the plugging effect quality, for different patching materialss, because its characteristic is different, its using method also has difference.
at present, a variety of patching materialss and the corresponding technology of using this patching materials to carry out leak stopping have been developed both at home and abroad, as shear-thickening liquid leakage stopping technology, diesel oil-wilkinite-cement leakage stopping technology, diesel oil-bentonite slurry technology, package blocking agent down-hole mixing thickening method, accelerated cement, thixotroping cement, the dedicated water mud leakage stopping technologies such as foamed cement, the pocket type leakage stopping technology, the crosslinked plugging agent of the present invention of polymkeric substance (delay) and the strong drill sleeve packing of clear water technology, well head back-up sand technology, compound leak stoppage bag, the Nylon Bag leak stoppage tool, drop into the leak stopping material that forms with the water soluble shells body, circulation leak stopping method, grout advances stifled Lou Fa etc., but, for the severe leakage well, use the leak stopping success ratio of above-mentioned blocking method not high.
For example China Petrochemical Industry south branch office is in the emphasis prospect pit " golden pheasant 1 well " of Liangping County, Chongqing City deployment, this well is in wellbore construction, run into the special formations such as many places solution cavity, crack and underground underground river due to brill, serious pernicious leakage occurs, spud in to during August 20 from March 8th, 2005, fail to set up normal mud circulation, adopted once the method constructions such as the leak stopping of bridge slurry, lost circulation additive, grout leak stopping and foam mud leakproof 103 times, do not reach the purpose that blocks drop ply, due to leakage, this well is missed working fluid 73415.5m altogether 3, lose huge.
Wherein cause and use existing patching materials and blocking method to carry out leak stopping, the major cause that success ratio is not high is as follows:
1, the viscosity of patching materials is low: at first all patching materialss must be all fluids, if therefore patching materials viscosity is low, when patching materials runs into drop ply, also can miss in a large number, flow into the drop ply deep, and can not pile up near the drop ply entrance, form slug, also just can not play in ingress the leak stopping effect, be difficult to stitch hole and fill up fully.
2, the force of cohesion of plugging agent is low, easily by water, rushed rare: in general formation fracture solution cavity, water or mud are arranged, plugging agent is generally water base, both contacts, naturally mixed mutually, plugging agent must be rushed rare, can bring like this two direct results: [1] rushes rare plugging agent viscosity degradation that makes and more easily flows away, the more difficult delay of patching materials is accumulated near the interior entrance of drop ply, [2] plugging agent rush rare after, be difficult to condensation cure, or setting strength reduced greatly, compressive property descends, thereby the pressure that can't bear mud in well or working fluid makes the leak stopping failure.
In a word, existing plugging agent is easily rushed rare by water, is not easy to assemble at drop ply, is difficult for forming the required slug of leak stopping, therefore uses the plugging effect of existing plugging agent bad, and the leak stopping success ratio is low.
Summary of the invention
The invention provides the preparation method of a kind of plugging agent and this plugging agent thereof, this plugging agent, easily enter drop ply, having good visco-elasticity can cross venturi and splash and rise, be full of leakage crack, solution cavity space, and can automatically stop flowing in drop ply, and difficulty is mixed with oil, gas, water, formation can cut off the gel with high viscosity and gel strength " slug " of stratum internal flow and wellbore fluids, and make this slug have enough startup pressure reduction, reach the purpose of leak stopping with the difference greater than mud column pressure and formation fluid pressure.The invention also discloses a kind of blocking method of this plugging agent of application, this blocking method and plugging agent are mainly for large leakage, lose and to return, to return too little (leaks fast tens sides/hour more than) and the Fractured that the spray leakage coexists of output, solution cavity, broken formation and with insurmountable leakage problems of method such as bridging plug leak stopping, lost circulation additives, adopt this plugging agent and blocking method simply do not need to increase extra leak stopper and can effectively solve various pernicious leakages, have good using value and social value.
For reaching above-mentioned purpose, technical scheme of the present invention specifically is achieved in that
A kind of plugging agent comprises:
The composition of water-soluble hydrophobic associated polymkeric substance or water-soluble hydrophobic associated polymkeric substance.
Preferably, described water-soluble hydrophobic associated polymkeric substance comprises:
Belong to by parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene the multipolymer that basic metal that unsaturated acid, monoene belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and any one or multiple copolymerization in the nonionic ethylenically unsaturated monomer form;
And/or, the multipolymer that any one in parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer and nonionic ethylenically unsaturated monomer or multiple copolymerization form, then the material that obtains with basic hydrolysis;
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance comprises:
The combination of one or more in the composition of the composition of the composition of the composition of the composition of the composition of water-soluble hydrophobic associated polymkeric substance and water, water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water, water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water, water-soluble hydrophobic associated polymkeric substance and linking agent and water, water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water and water-soluble hydrophobic associated polymkeric substance and cement and water.
Preferably, described parents' unsaturated monomer is included as alkyl dimethyl allyl group chlorination amine.
Preferably, described hydrophobicity ethylenically unsaturated monomer is included as the N-alkyl acrylamide.
Preferably, described nonionic ethylenically unsaturated monomer, comprise in acrylamide, Methacrylamide, N tert butyl acrylamide and N methacrylamide any one or multiple.
Preferably, described monoene belongs to unsaturated acid and comprises allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.5-5 part and 95-99.5 part water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and water, in mass fraction, comprising: 1.2 parts of water-soluble hydrophobic associated polymkeric substance and 98.8 parts of water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.01-3 part tensio-active agent and 92-99.79 part water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water, in mass fraction, comprising: 1 part of water-soluble hydrophobic associated polymkeric substance, 0.1 part of tensio-active agent and 98.9 parts of water.
Preferably, described tensio-active agent comprises: any one in C8-C18 alkyl sodium sulfonate, C8-C18 sodium alkyl benzene sulfonate and C8-C18 sodium alkyl sulfate or multiple.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.1-10 part water-swelling particle and 85-99.7 part water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water, in mass fraction, comprising: 1 part of water-soluble hydrophobic associated polymkeric substance, 3 parts of water-swelling particles and 96 parts of water.
Preferably, described water-swelling particle comprises: any one in water absorbing resin particle and water sucting rubber particle or multiple.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and linking agent and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.01-2 part linking agent, 93-99.79 part water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and linking agent and water, in mass fraction, comprising: 1 part of water-soluble hydrophobic associated polymkeric substance, 0.2 part of linking agent, 98.8 parts of water.
Preferably, described linking agent comprises: phenolic aldehyde, Cr 3+And Al 3+In any one or multiple.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 1-10 part bridging plug patching materials, 85-98.8 part water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water, in mass fraction, comprising: 1 part of water-soluble hydrophobic associated polymkeric substance, 5 parts of bridging plug patching materialss, 96 parts of water.
Preferably, described bridging plug patching materials comprises: any one in nut-shell, cotton seed hulls, rubber grain or multiple.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and cement and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.5-5 part, 166.7-250 part cement, 95.0-99.5 part water.
Preferably, the composition of described water-soluble hydrophobic associated polymkeric substance and cement and water, in mass fraction, comprising: 1 part of water-soluble hydrophobic associated polymkeric substance, 222 parts of cement, 99 parts of water.
Preferably, described cement comprises: any one in oil well cement, rapid hardening cement and fibrocement or multiple.
A kind of preparation method of plugging agent, the method comprise copolymerization co-hydrolysis and copolymerization co-hydrolysis:
1) copolymerization co-hydrolysis
, raw material is added wherein and the formation monomer solution that stirs than adding deionized water according to metering; Then pass into high pure nitrogen in monomer solution, and adopt the temperature (being polymerization temperature) of chilled brine or the thermal cycling water-bath hierarchy of control; Then add the initiator initiated polymerization in monomer solution; After polyreaction finishes, water-soluble hydrophobic associated polymeric colloid is ground into particle, adds sodium hydroxide or sodium carbonate to be hydrolyzed, and after drying, pulverizing and get final product.
Wherein, described comonomer comprise basic metal that parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene belong to unsaturated acid, monoene and belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and in the nonionic ethylenically unsaturated monomer any one or multiple, and further recommend the proportioning of each monomer to be (in mass fraction): 1-10 part parents' unsaturated monomer or hydrophobicity ethylenically unsaturated monomer, 20-35 part monoene belong to unsaturated acid and 79-55 part nonionic ethylenically unsaturated monomer.
Preferably, described parents' unsaturated monomer can be alkyl dimethyl allyl group chlorination amine, and wherein alkyl chain length can be C6-C22, recommends C12-C20, further is recommended as C14-C18.
Preferably, described hydrophobicity ethylenically unsaturated monomer can be the N-alkyl acrylamide.
Preferably, described nonionic ethylenically unsaturated monomer, can be in acrylamide, Methacrylamide, N tert butyl acrylamide and N methacrylamide any one or multiple.
Preferably, to belong to unsaturated acid can be allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid to described monoene; And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid.
Preferably, the total monomer concentration of described water-soluble hydrophobic associated polymer monomer solution is 15%-35%.
Preferably, described polymerization temperature scope is 5～50 ℃.
Preferably, described initiator is the composition of redox initiator and thermal initiator, and wherein oxygenant is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate; Reductive agent is one or more of S-WAT, sodium bisulfite, urea, trolamine; Thermal initiator is one or more of Diisopropyl azodicarboxylate, azo diisobutyl amidine hydrochloride, azo di-isopropyl imidazoline salt hydrochlorate and azo-bis-iso-dimethyl;
The concentration of described initiator is the 0.05-1% of hydrophobic monomer and non-ionic monomer total mass, and further is recommended as 0.2-0.5%;
Preferably, the dosage of sodium hydroxide or sodium carbonate is the 2-5% of water-soluble hydrophobic associated polymer latex weight.
Preferably, described hydrolysis temperature is 75-95 ℃, and hydrolysis time is 2～4 hours.
Preferably, described drying temperature is 90-110 ℃, and be 2～4 hours time of drying.
2) copolymerization co-hydrolysis
, raw material is added wherein and the formation monomer solution that stirs than adding deionized water according to metering; Add again sodium hydroxide or the sodium carbonate of certain mass, stir; Then pass into high pure nitrogen in monomer solution, and adopt the temperature (being polymerization temperature) of chilled brine or the thermal cycling water-bath hierarchy of control; Then add the initiator initiated polymerization in monomer solution; After polyreaction finishes, water-soluble hydrophobic associated polymeric colloid is ground into particle, and after drying, pulverizing and get final product.
Wherein, described comonomer comprise basic metal that parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene belong to unsaturated acid, monoene and belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and in the nonionic ethylenically unsaturated monomer any one or multiple, and further recommend the proportioning of each monomer to be (in mass fraction): 1-10 part parents' unsaturated monomer or hydrophobicity ethylenically unsaturated monomer, 20-35 part monoene belong to unsaturated acid and 79-55 part nonionic ethylenically unsaturated monomer.
Preferably, described parents' unsaturated monomer can be alkyl dimethyl allyl group chlorination amine, and wherein alkyl chain length can be C6-C22, recommends C12-C20, further is recommended as C14-C18.
Preferably, described hydrophobicity ethylenically unsaturated monomer can be the N-alkyl acrylamide.
Preferably, described nonionic ethylenically unsaturated monomer, can be in acrylamide, Methacrylamide, N tert butyl acrylamide and N methacrylamide any one or multiple.
Preferably, to belong to unsaturated acid can be allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid to described monoene; And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid.
Preferably, the total monomer concentration of described water-soluble hydrophobic associated polymer monomer solution is 15%-35%.
Preferably, described initiator is the composition of redox initiator and thermal initiator, and wherein oxygenant is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate; Reductive agent is one or more of S-WAT, sodium bisulfite, urea, trolamine; Thermal initiator is one or more of Diisopropyl azodicarboxylate, azo diisobutyl amidine hydrochloride, azo di-isopropyl imidazoline salt hydrochlorate and azo-bis-iso-dimethyl;
The concentration of described initiator is the 0.05-1% of hydrophobic monomer and non-ionic monomer total mass, and further is recommended as 0.2-0.5%;
Preferably, the dosage of sodium hydroxide or sodium carbonate is the 8-20% of each monomer total mass.
Preferably, described polymerization temperature scope is 5～50 ℃.
Preferably, described drying temperature is 90-110 ℃, and be 2～4 hours time of drying.
After obtaining water-soluble hydrophobic associated polymkeric substance, the method further comprises:
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added to the water, and stirs 2-3 hour.
Preferably, described obtain water-soluble hydrophobic associated polymkeric substance after, the method further comprises:
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance tensio-active agent, and stir 2-3 hour.
Preferably, described obtain water-soluble hydrophobic associated polymkeric substance after, the method further comprises:
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance the water-swelling particle, and stir 2-3 hour.
Preferably, described obtain water-soluble hydrophobic associated polymkeric substance after, the method further comprises:
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance linking agent, and stir 2-3 hour.
Preferably, described obtain water-soluble hydrophobic associated polymkeric substance after, the method further comprises:
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance the bridging plug patching materials, and stir 2-3 hour.
Preferably, after described stirring 2-3 hour, the method further comprises:
Add cement, and stirred 1 hour.
A kind of blocking method of applying above-mentioned plugging agent, the method comprises:
Described plugging agent is just being clamp-oned the leakage stratum;
After described plugging agent just being clamp-oned the leakage stratum, again to described leakage stratum, inject plugging agent, make the plugging agent that injects for the first time be ejected drilling tool fully, and keep the drop ply of described plugging agent and the nearly bore hole annulus on drop ply top to be full of described plugging agent;
Fill up described nearly bore hole annulus to space between well head, and standing more than 5 hours.
Preferably, for the first time described and timed interval that plugging agent is just being clamp-oned between described leakage bottom for the second time is 5-10 minute.
Preferably, describedly fill up described nearly bore hole annulus to space between well head, comprising:
Use mud or water is counter pours into described nearly bore hole annulus to space between well head.
As seen from the above technical solution, this plugging agent of the present invention, adopt the composition of water-soluble hydrophobic associated polymkeric substance or water-soluble hydrophobic associated polymkeric substance, water-soluble hydrophobic associated polymkeric substance is a kind of water base fluid, but the force of cohesion of himself is from far away greater than the avidity between it and oil, gas, water, so it and oil, gas, water etc. are difficult to mutually mix while meeting, and respectively have an independently phase of one's own, simultaneously water be difficult to mix with it and rush rare it.
Secondly, this plugging agent of the present invention has very high viscosity and good shear thinning property, shearing dilution, and wherein, apparent viscosity is greater than 10000mPa.s (7.34s -1); Gel strength was more than or equal to 15Pa in 1 minute.Terraced (as 300-1000S at higher speed -1) under have lower viscosity (100-200mPa.s), therefore, mobility is preferably arranged in transfer lime, more low viscosity is higher but high viscosity and speed ladder are arranged very under the low speed ladder, for example the speed ladder is at 7.34s -1The time, its viscosity has 5-10 ten thousand mPa.s or higher.
And this plugging agent of the present invention has good visco-elasticity, and elastic proportional is high, can fully arrange and drive resident fluid, effectively occupies or is full of underground drop ply seam, space, hole, thereby be easy to can form the slug of layer fluid and pit shaft fully isolator in stratum.
In addition, the standing rear generation internal structure of this plugging agent of the present invention and can strengthening in time, wanting makes it to recover to flow must add larger stress to overcome this gel strength.
Have again, this plugging agent of the present invention can with other solid material, as bridging plug particle, cement, remove the mixing and do not affect above-mentioned characteristic such as soil.
finally, the formed slug of this plugging agent of the present invention has certain quiet yielding stress and elasticity, and very high trigger pressure gradient is arranged, by this plugging agent is replaced in well, allow its leakage enter crack, because it and water are difficult for mixing, shipwreck is rare with Jiang Qichong, it has again good visco-elasticity and high viscosity simultaneously, and very large stream core arranged, can form the piston-like movement expelling water in crack and be full of whole crack, along with the plugging agent on the stratum of bleeding increases, leaking speed slows down, fluid increases rapidly in the crack medium viscosity, therefore Lou speed further slowed down, promote again that viscosity increases rapidly, so circulation, with make the fluid that enters drop ply enter the drop ply depths certain apart from the time, automatically stop flowing, and form the slug of complete compartment stratum and pit shaft.
Because plugging agent of the present invention is a kind ofly can completely cut off the plugging agent slug of the present invention that contacts between resident fluid and pit shaft fully, it is the very large structural fluid of moving resistance, because it has very strong quiet structural strength, it is started must have enough pressure to promote.Required pressure drop when therefore (if P mud-P leaks) re-moves (namely continuing leakage) less than this plugging agent slug plugging agent of the present invention, leak stopping success.
In well during positive pressure differential, the drop ply leakage pressure that it is equivalent to increase; If pressure reduction is less than its leak stopping success, leak stopping is unsuccessful if pressure reduction is greater than it, but has increased the upper limit of ' Safe Density Windows.When Negative Pressure Difference, the reservoir pressure that it has been equivalent to reduce, namely equal to push down the reduction value (namely having reduced the lower limit of security window) of the required mud density of this resident fluid.Therefore it not only may directly block this pernicious leakage, and it has irreplaceable effect for enlarging the ' Safe Density Windows that is formed by " leaking-spray ".
This slug can make existing multiple plugging agent and leakage stopping technology play a role.Because it has good carrying capacity; And it can stop very soon on request automatically after entering drop ply; And can with oil, gas, water, not mix, be difficult for being rushed by water rare yet; Resident fluid can be arranged drive in the depths, stratum fully, take whole leakage space; Form and to cut off the plugging agent slug of the present invention that stratum and pit shaft contact fully.This is existing various plugging agents and leakage stopping technology greatest drawback and weakness just, for example, mostly leak stopping be incessantly fixed with the normal reason that lost efficacy of grout and rushed rarely by water, so it and other present multiple plugging agent and leakage stopping technology unite use, may receive better effect.
Plugging agent of the present invention and blocking method are specially adapted to prevent or stop the pernicious leakage of Fractured (fracture width is greater than 1mm) and the underground work liquid of broken brittle formation in drilling well and other borehole operation processes, and the blowout of the oil gas high pressure formation that causes thus.This blocking method also is applicable to the plugging operations under the other field conditions of similarity.
Description of drawings
Fig. 1 is the blocking method schema of the embodiment of the present invention.
Fig. 2 is the blocking method schematic diagram of the embodiment of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The embodiment of the present invention provides a kind of plugging agent, and its main component is the composition of water-soluble hydrophobic associated polymkeric substance or water-soluble hydrophobic associated polymkeric substance.
Wherein, described water-soluble hydrophobic associated polymkeric substance comprises:
Belong to by parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene the multipolymer that basic metal that unsaturated acid, monoene belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and any one or multiple copolymerization in the nonionic ethylenically unsaturated monomer form;
And/or, the multipolymer that any one in parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer and nonionic ethylenically unsaturated monomer or multiple copolymerization form, then the material that obtains with basic hydrolysis;
Wherein, the composition of described water-soluble hydrophobic associated polymkeric substance comprises:
The combination of one or more in the composition of the composition of the composition of the composition of the composition of the composition of water-soluble hydrophobic associated polymkeric substance and water, water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water, water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water, water-soluble hydrophobic associated polymkeric substance and linking agent and water, water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water and water-soluble hydrophobic associated polymkeric substance and cement and water.
Preferably, described parents' unsaturated monomer can be alkyl dimethyl allyl group chlorination amine, and wherein alkyl chain length can be C6-C22, recommends C12-C20, preferably C14-C18.
Preferably, described hydrophobicity ethylenically unsaturated monomer can be the N-alkyl acrylamide.
Preferably, described nonionic ethylenically unsaturated monomer, can be in acrylamide, Methacrylamide, N tert butyl acrylamide and N methacrylamide any one or multiple.
Preferably, to belong to unsaturated acid can be allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid to described monoene; And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid.
If plugging agent adopts the composition of described water-soluble hydrophobic associated polymkeric substance and water,, in mass fraction, can be the water-soluble hydrophobic associated polymkeric substance of 0.5-5 part and 95-99.5 part water.Preferably 1.2 parts of water-soluble hydrophobic associated polymkeric substance and 98.8 parts of water, such proportioning gets through experiment, the excessive concentration of water-soluble hydrophobic associated polymkeric substance, high cost, solution preparation and injection difficulty, the concentration of water-soluble hydrophobic associated polymkeric substance is low, can not get the performance that needs, so experiment draws this proportioning, can access the balance of over-all properties.
Wherein, the clean-up performance of water is any, can be that common tap water also can the local use Oil-well Reservior Water.
If plugging agent adopts the composition of described water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water,, in mass fraction, can be the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.01-3 part tensio-active agent and 92-99.79 part water.1 part of water-soluble hydrophobic associated polymkeric substance preferably, 0.1 part of tensio-active agent and 98.9 parts of water.
Optimum ratio obtains according to experiment, and through experiment, the intensity of plugging agent is along with the increase of surfactant concentration first increases rear reduction, and while adding 0.1 part, intensity is maximum, adds greater than the intensity range of decrease after 3 parts larger.
Wherein, tensio-active agent can be in C8-C18 alkyl sodium sulfonate, C8-C18 sodium alkyl benzene sulfonate, C8-C18 sodium alkyl sulfate any one or multiple, recommend C12-C16 alkyl sodium sulfonate, C12-C16 sodium alkyl benzene sulfonate and C12-C16 sodium alkyl sulfate.
If plugging agent adopts the composition of described water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water,, in mass fraction, can be the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.1-10 part water-swelling particle and 85-99.7 part water.1 part of water-soluble hydrophobic associated polymkeric substance preferably, 3 parts of water-swelling particles and 96 parts of water.
Optimum ratio obtains according to experiment, through experiment, and after adding the water-swelling particle, due to the particle suction, the plugging agent strength increase, after particle was increased to 3 parts, because the plugging agent inclusion granule is more, the visco-elasticity of plugging agent started variation.
Wherein said water-swelling particle can be in water absorbing resin particle and water sucting rubber particle any one or multiple.
If plugging agent adopts the composition of described water-soluble hydrophobic associated polymkeric substance and linking agent and water,, in mass fraction, can be the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.01-2 part linking agent, 93-99.79 part water.
1 part of water-soluble hydrophobic associated polymkeric substance preferably, 0.2 part of linking agent and 98.8 parts of water.
Optimum ratio obtains according to experiment, and through experiment, plugging agent intensity increases along with the increase of crosslinker concentration, but can produce excessively crosslinkedly when crosslinker concentration is excessive, makes the gel elastomer variation, the stability reduction.
Wherein, described linking agent can be phenolic aldehyde, 3 valency chromium ion Cr 3+With 3 valency aluminum ion Al 3+In any one or multiple.
If plugging agent adopts the composition of described water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water,, in mass fraction, can be the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 1-10 part bridging plug patching materials and 85-98.8 part water.1 part of water-soluble hydrophobic associated polymkeric substance preferably, 5 parts of bridging plug patching materialss, 96 parts of water.
Optimum ratio obtains according to experiment, because plugging agent of the present invention is without the solid phase plugging agent, after adding bridging plug solid phase patching materials, enter bridging plug particle in the drop ply process at plugging agent and play bridging action, if thereby but the bridging plug particle uses the too high gel continuity of can destroying that visco-elasticity is reduced.
Wherein, described bridging plug patching materials can be in nut-shell, cotton seed hulls, rubber grain any one or multiple.
If plugging agent adopts the composition of described water-soluble hydrophobic associated polymkeric substance and cement and water,, in mass fraction, can be the water-soluble hydrophobic associated polymkeric substance of 0.5-5 part, 166.7-250 part cement, 95.0-99.5 part water.1 part of water-soluble hydrophobic associated polymkeric substance preferably, 222 parts of cement, 99 parts of water.
Optimum ratio obtains according to experiment, and this ratio has guaranteed that namely the intrinsic viscous-elastic behaviour of plugging agent has guaranteed again the characteristic of cement solidification.
Wherein, described cement can be in oil well cement, rapid hardening cement and fibrocement any one or multiple.
For preparing above-mentioned plugging agent, the embodiment of the present invention one also provides a kind of preparation method's (copolymerization co-hydrolysis) of plugging agent, and the method comprises the steps:
1) copolymerization co-hydrolysis
, raw material is added wherein and the formation monomer solution that stirs than adding deionized water according to metering; Then pass into high pure nitrogen in monomer solution, and adopt the temperature (being polymerization temperature) of chilled brine or the thermal cycling water-bath hierarchy of control; Then add the initiator initiated polymerization in monomer solution; After polyreaction finishes, water-soluble hydrophobic associated polymeric colloid is ground into particle, adds sodium hydroxide or sodium carbonate to be hydrolyzed, and after drying, pulverizing and get final product.
Wherein, described comonomer comprise basic metal that parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene belong to unsaturated acid, monoene and belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and in the nonionic ethylenically unsaturated monomer any one or multiple, and further recommend the proportioning of each monomer to be (in mass fraction): 1-10 part parents' unsaturated monomer or hydrophobicity ethylenically unsaturated monomer, 20-35 part monoene belong to unsaturated acid and 79-55 part nonionic ethylenically unsaturated monomer.
Preferably, described parents' unsaturated monomer can be alkyl dimethyl allyl group chlorination amine, and wherein alkyl chain length can be C6-C22, recommends C12-C20, further is recommended as C14-C18.
Preferably, described hydrophobicity ethylenically unsaturated monomer can be the N-alkyl acrylamide.
Preferably, described nonionic ethylenically unsaturated monomer, can be in acrylamide, Methacrylamide, N tert butyl acrylamide and N methacrylamide any one or multiple.
Preferably, to belong to unsaturated acid can be allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid to described monoene; And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid.
Preferably, the total monomer concentration of described water-soluble hydrophobic associated polymer monomer solution is 15%-35%.
Preferably, described polymerization temperature scope is 5～50 ℃.
Preferably, described initiator is the composition of redox initiator and thermal initiator, and wherein oxygenant is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate; Reductive agent is one or more of S-WAT, sodium bisulfite, urea, trolamine; Thermal initiator is one or more of Diisopropyl azodicarboxylate, azo diisobutyl amidine hydrochloride, azo di-isopropyl imidazoline salt hydrochlorate and azo-bis-iso-dimethyl;
The concentration of described initiator is the 0.05-1% of hydrophobic monomer and non-ionic monomer total mass, and further is recommended as 0.2-0.5%;
Preferably, the dosage of sodium hydroxide or sodium carbonate is the 2-5% of water-soluble hydrophobic associated polymer latex weight.
Preferably, described hydrolysis temperature is 75-95 ℃, and hydrolysis time is 2～4 hours.
Preferably, described drying temperature is 90-110 ℃, and be 2～4 hours time of drying.
Embodiment two,
If any one in described water-soluble hydrophobic associated polymer monomer employing parents unsaturated monomer, hydrophobicity ethylenically unsaturated monomer and nonionic ethylenically unsaturated monomer or multiple.Its preparation method can also, for the copolymerization co-hydrolysis, comprise the steps:
, raw material is added wherein and the formation monomer solution that stirs than adding deionized water according to metering; Add again sodium hydroxide or the sodium carbonate of certain mass, stir; Then pass into high pure nitrogen in monomer solution, and adopt the temperature (being polymerization temperature) of chilled brine or the thermal cycling water-bath hierarchy of control; Then add the initiator initiated polymerization in monomer solution; After polyreaction finishes, water-soluble hydrophobic associated polymeric colloid is ground into particle, and after drying, pulverizing and get final product.
Wherein, described comonomer comprise basic metal that parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene belong to unsaturated acid, monoene and belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and in the nonionic ethylenically unsaturated monomer any one or multiple, and further recommend the proportioning of each monomer to be (in mass fraction): 1-10 part parents' unsaturated monomer or hydrophobicity ethylenically unsaturated monomer, 20-35 part monoene belong to unsaturated acid and 79-55 part nonionic ethylenically unsaturated monomer.
Preferably, described parents' unsaturated monomer can be alkyl dimethyl allyl group chlorination amine, and wherein alkyl chain length can be C6-C22, recommends C12-C20, further is recommended as C14-C18.
Preferably, described hydrophobicity ethylenically unsaturated monomer can be the N-alkyl acrylamide.
Preferably, described nonionic ethylenically unsaturated monomer, can be in acrylamide, Methacrylamide, N tert butyl acrylamide and N methacrylamide any one or multiple.
Preferably, to belong to unsaturated acid can be allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid to described monoene; And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid; And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid.
Preferably, the total monomer concentration of described water-soluble hydrophobic associated polymer monomer solution is 15%-35%.
Preferably, described initiator is the composition of redox initiator and thermal initiator, and wherein oxygenant is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate; Reductive agent is one or more of S-WAT, sodium bisulfite, urea, trolamine; Thermal initiator is one or more of Diisopropyl azodicarboxylate, azo diisobutyl amidine hydrochloride, azo di-isopropyl imidazoline salt hydrochlorate and azo-bis-iso-dimethyl;
The concentration of described initiator is the 0.05-1% of hydrophobic monomer and non-ionic monomer total mass, and further is recommended as 0.2-0.5%;
Preferably, the dosage of sodium hydroxide or sodium carbonate is the 8-20% of each monomer total mass.
Preferably, described polymerization temperature scope is 5～50 ℃.
Preferably, described drying temperature is 90-110 ℃, and be 2～4 hours time of drying.
In addition, after preparing water-soluble hydrophobic associated polymkeric substance, can also further add other materials to form the composition of water-soluble hydrophobic associated polymkeric substance.
For example, described obtain water-soluble hydrophobic associated polymkeric substance after, in 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added to the water, and stirs 2-3 hour, obtain the composition of water-soluble hydrophobic associated polymkeric substance and water.Polymer beads is fully dissolved.
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance tensio-active agent, and stir 2-3 hour, obtain the composition of water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water.
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance the water-swelling particle, and stir 2-3 hour, obtain the composition of water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water.
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance linking agent, and stir 2-3 hour, obtain the composition of water-soluble hydrophobic associated polymkeric substance and linking agent and water.
In 10～20 minutes, described water-soluble hydrophobic associated polymkeric substance is added in the water that is mixed with in advance the bridging plug patching materials, and stir 2-3 hour, obtain the composition of water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water.
Perhaps, after the composition of the water-soluble hydrophobic associated polymkeric substance that obtains and water, further add cement, and stirred 1 hour, obtain the composition of water-soluble hydrophobic associated polymkeric substance and cement and water.
In addition, for realizing leak stopping, the embodiment of the present invention also provides a kind of and applies above-mentioned plugging agent and carry out the method for leak stopping, and as shown in Figure 1 and Figure 2, the method comprises:
Step 301, with described plugging agent just clamp-oning the leakage stratum; The consumption of plugging agent can be 50-200m 3(according to oil gas leakage speed, fracture width, the far-reaching degree in crack, determine.Speed is large, crack is wide, crack is more far-reaching if leak, and recommends to use plugging agent 100-200m 3Speed is medium, crack is wider, crack is more far-reaching, can use plugging agent 50-100m if leak 3Plugging agent should be missed and enter more to this process soon, in a large number.
Step 302, described plugging agent is just being clamp-oned the leakage stratum after, again to described leakage stratum, inject plugging agent, make the plugging agent that injects for the first time be ejected drilling tool fully, and keep the drop ply of described plugging agent and the nearly bore hole annulus on drop ply top to be full of described plugging agent;
Can hang down discharge capacity (deceleration) (the medium strokes per minute of slush pump) and just clamp-on again plugging agent 20-50m 3Allow it eject the plugging agent that injects for the first time in drilling tool fully, and keep the plugging agent liquid level to surpass drop ply, and occupy the nearly bore hole annulus part on drop ply top, for example by just clamp-oning former mud (or clear water), allow it eject the plugging agent that injects for the second time in drilling tool fully, thereby make plugging agent all occupy drop ply and nearly bore hole annulus part thereof.
Step 303, fill up described nearly bore hole annulus to space between well head, and standing more than 5 hours.
After step 302, if underfilling mud between nearly bore hole annulus topmost and well head can be filled with former mud (or clear water) is anti-, annular space is full of.
Wherein, for the first time described and timed interval that for the second time plugging agent is just being clamp-oned between described leakage bottom is preferably 5-10 minute.Subsequently, if will pull out of hole, connect drill bit, can fill former mud by every 3 columns, utilize the trip-out time, make plugging agent quiet stifled more than 5 hours, make it fully form structure, shear force, intensity, elasticity etc.Under degree of creeping into want suitably, intoo drastic, first disturbance on earth, slow turn on pump pushes up again, after normal circulation (or drilling), has mud to return out, and pump pressure and discharge capacity constant (normally), moreover after the operations such as disturbance, pressure testing, the limited pressure of spraining, annulus liquid level is constant or lose and leak, and shows the leak stopping success.
Below lift some application examples.
Example 1,
Formula: 1.2 parts of polymkeric substance+98.8 part H 2O, viscosity 35800mPa.s, gel strength 19.0Pa; Applicable elements: shallow well, temperature low (in 70 ℃), pressure (poor) are less than 3MPa.
Rig-site utilization
When Liu67-72Jing is drilled into 1629 meters leakage occurs, the mud density 1.02-1.03g/cm of employing 3, maximum 200 meters of leakage liquid level, adopt bridge crutch bridge material particle diameter 3-5mm, and nine leak stopping of cementing plug are failure all.Elicite 29 meters of liquid levels, lower polish drill rod to 1500 meter, pump into plugging agent 34m of the present invention 3, inject subsequently clear water 12m 3, tripping out drilling tool and be drilled into shaft bottom under after standing 6 hours, it is normal that turn on pump returns discharge capacity outward.Circulate after 15 minutes, 150KN+65rpm creeps into 8 meters, and the pump pressure discharge capacity is all normal, the leak stopping success.
Example 2
Formula: 1 part of polymkeric substance+0.1 part tensio-active agent+98.9 parts of H 2O, plugging agent viscosity 43600mPa.s of the present invention, gel strength 20.5Pa, applicable elements: shallow well, temperature low (in 70 ℃), pressure (poor) are less than 3MPa.
Rig-site utilization
Win 407 wells and be drilled into 187 meters generation leakages of well depth, with bridge blinding type leak stopping slurry (comprehensive plugging agent+list envelope+native powder) leak stopping, success.Just annotating the plugging agent 20m of the invention described above 3, pump into 10m 3The time well head return out plugging agent leak stopping of the present invention slurry, close well head, inject 1.5m 3Plugging agent of the present invention, pump pressure is 3MPa, is down to 1MPa after termination of pumping.Quiet stifled 4 hours, the leak stopping success.Occur while being drilled into 324 meters of well depths to lose to return leakage, with bridge blinding type leak stopping slurry (comprehensive plugging agent+list envelope+native powder) leak stopping, successful.Just annotating plugging agent 40m 3, quiet stifled 4 hours, under be drilled into shaft bottom and spud in, return slurry normal, the leak stopping success.
Example 3
Formula: 1 part of polymkeric substance+3 part water-swelling particle+96 part water,
Applicable elements: shallow well, temperature low (in 70 ℃), pressure (poor) are less than 5MPa.
Rig-site utilization
Chuan207Jing is drilled into well depth 1872m, occurs to lose to return leakage, stops boring the plugging agent 60m of preparation the invention described above 3, lower polish drill rod, to shaft bottom, closes blowout preventer and clamp-ons 45m 3, voltage stabilizing 0.5MPa, 10min does not fall.Open blowout preventer, return and tell 2m 3Under be drilled into shaft bottom and spud in normally, the leak stopping success.
Example 4
0.01 part-2 parts of linking agents, 99.79 parts of-93 parts of water, recommend 1 part of polymkeric substance, 0.2 part of linking agent, and 98.8 parts of water,
Applicable elements: deep-well, temperature high (50-140 ℃), pressure (poor) are less than 5MPa.
Rig-site utilization
Chuan024Jing bores while meeting Jurassic systerm three rooms group stratum, and the leakage of Fractured only import but no export occurs, 2495 meters of leakage well depths, and the leakage stratum is J2S, lithology is the greyish-green siltstone.Stop boring the above-mentioned plugging agent 80m of preparation the present invention 3, lower drilling rod, to shaft bottom, is starched plugging agent of the present invention with leak stopping and is just being clamp-oned fast leakage stratum 50m 3, and then low discharge capacity (deceleration) is just being clamp-oned plugging agent 30m more subsequently 3, and then just clamp-oning former mud, allow it eject fully in drilling tool and inject for the second time plugging agent, quiet stifled 5 hours of plugging agent.Make it fully form structure, shear force, intensity, elasticity etc.Subsequently, discharge capacity in lower brill drilling well circulation, pump pressure are normal, the leak stopping success.
Example 5
Formula: 1 part of polymkeric substance+5 part patching materials+96 parts of water,
Applicable elements: middle low temperature (in 90 ℃), pressure (poor) are less than 8MPa
Rig-site utilization:
When ground 104 wells are drilled into 2178 meters, pump pressure decline/wellhead slurry loses and returns, and the discovery leakage stops to bore immediately, joins thick slurry 60m 3, pumping in well, 3 minutes mud of turn on pump returns out, and discharge capacity only has 1/4 of normal amount, transfers after drill bit to 2178 meters mud, and well head loses and returns.Successively leak stopping 7 times (table cover subscript cement 1 time, shaft bottom cementing 5 times, bridging plug leak stopping 1 time), all not success, determine new polymers plugging agent of the present invention+bridging plug patching materials leak stopping.Clear water preparation 50m 3, 1 part of polymkeric substance adds 5 parts of bridging plug patching materialss, stirs after 2 hours; Lower polish drill rod is to shaft bottom, and turn on pump pumps into 43m 3After plugging agent, well head returns out drilling fluid; Close blowout preventer and clamp-on plugging agent 5m 3, static leak stopping 5 hours, lower brill creeps into, and it is normal that well head returns slurry, the leak stopping success.
Example 6
Formula: 1 part of plugging agent+H of the present invention 2After dissolving in O, then press water cement ratio 0.45, calculate cement amount, directly add in the plugging agent system of the present invention for preparing, after stirring, recording its presetting period is 2-3 hour.
Applicable elements: each condition all can
Rig-site utilization:
Occur when Chuan204Jing is drilled into 2011 meters to lose the property returned leakage, adopt 13 carclazyte bridging plug leak stopping slurry accelerated cement all can not form effective cement plug, the well filling sidetracking.Get into 2013 meters mistakes after sidetracking is gone out and return, use carclazyte bridging plug leak stopping slurry to have no and return out all the time, change plugging agent of the present invention into and add the cement leak stopping, preparation 60m 3Plugging agent, inject 45m 3The time, mud returns out and is tending towards normal, closes blowout preventer and clamp-ons 10m 3Plugging agent, closing well are after 12 hours, and leak stopping is successful.
Example 7
Formula: above-mentioned various formulas plugging agent of the present invention is hot on the trail of cement.
Applicable elements: each condition all can
Rig-site utilization
(1) two mausoleums, northeast, river 1 well, three open after, from 2083-3573.01m, must family what, Lei Koupo, Jia Lingjiang River totally six leak source: 3483m(lose return), 3448m(loses and returns), 3436m(loses and returns), 2769m, 2749m, 2231m; Bearing capacity 1.70-1.80.1.60g/cm 3Mud normally creeps into: be drilled into the 3573m high-pressure gas reservoir, to be 1.90(△ P be-0.2 to P gas): the weighted mud drop ply leakage of layer of calming the anger forms strong blowout; When speedily carrying out rescue work, kill-job must first block the pernicious leakage of " having into nothing ".Leak stopping was approximately gone through two months, and existing the whole bag of tricks leak stopping is invalid, determined cementing plug envelope gas-bearing formation: be to guarantee the cementing plug success, 3483m, 3446m, the 3436m(that must effectively block deep is to lose and returns) three drop plies.For this reason, pump into altogether 70m for three drop plies respectively 3(1%) plugging agent of the present invention; Cement 25m in hot pursuit 3, once success, cement return high 2355m, and the plugging agent of the present invention of 100m is arranged on cement plug.The kill-job shutoff is success once, and guaranteeing speedily carries out rescue work completes smoothly.
9 wells of calling together of brill hold in (2) 40595 drill crews, are positioned at Wushen Banner crow and examine and call together, and this well creeps into that (stratum: Buddhist monk's ditch) miss, after being drilled into 2265 meters of well depths, lower polish drill rod, to 2120 meters of well depths, pumps into the new polymers plugging agent (25m of configuration to 2220 meters of well depths 3Clear water+350kg plugging agent of the present invention) 20m 3, closing well is clamp-oned 20m 3Rear Cementing success.
The continent 24-25 well of brill holds in (3) 40619 drill crews, is positioned at Mizhi County Du Jiashigouzhen, and this well is drilled into 1803 meters of well depths and misses, and after being drilled into 1958 meters of well depths, the lower polish drill rod that pulls out of hole, to 1780 meters of well depths, pumps into the new polymers plugging agent (25m of configuration 3Clear water+350kg plugging agent of the present invention) 16.5m 3, closing well is clamp-oned 20m 3, after and then Cementing success.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (9)

1. a plugging agent, is characterized in that, described plugging agent comprises: the composition of water-soluble hydrophobic associated polymkeric substance or water-soluble hydrophobic associated polymkeric substance.
2. require described plugging agent according to right 1, it is characterized in that, described water-soluble hydrophobic associated polymkeric substance belongs to by parents' unsaturated monomer, hydrophobicity ethylenically unsaturated monomer, monoene the multipolymer that basic metal that unsaturated acid, monoene belong to unsaturated acid, ammonium salt that monoene belongs to unsaturated acid and any one or multiple copolymerization in the nonionic ethylenically unsaturated monomer form;
Wherein, described parents' unsaturated monomer comprises: alkyl dimethyl allyl group chlorination amine, and the alkyl carbon atoms number is 6-22;
Described hydrophobicity ethylenically unsaturated monomer comprises: the N-alkyl acrylamide;
Described monoene belongs to unsaturated acid and comprises: allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid;
And/or, the basic metal of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid;
And/or, the ammonium salt of allyl sulphonic acid, styrene sulfonic acid, vinyl sulfonic acid;
Described nonionic ethylenically unsaturated monomer comprises:
Acrylamide, Methacrylamide, N tert butyl acrylamide and N-methacryloyl in amine any one or multiple.
3. plugging agent according to claim 2, is characterized in that, described water-soluble hydrophobic associated polymkeric substance comprises:
In mass fraction, 1-10 part parents' unsaturated monomer or hydrophobicity ethylenically unsaturated monomer;
20-35 part monoene belongs to unsaturated acid, or monoene belongs to the basic metal of unsaturated acid, or monoene belongs to the ammonium salt of unsaturated acid;
79-55 part nonionic ethylenically unsaturated monomer.
4. plugging agent according to claim 1, is characterized in that, the composition of described water-soluble hydrophobic associated polymkeric substance comprises:
The combination of one or more in the composition of the composition of the composition of the composition of the composition of the composition of water-soluble hydrophobic associated polymkeric substance and water, water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water, water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water, water-soluble hydrophobic associated polymkeric substance and linking agent and water, water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water and water-soluble hydrophobic associated polymkeric substance and cement and water.
5. plugging agent according to claim 4, is characterized in that,
The composition of described water-soluble hydrophobic associated polymkeric substance and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.5-5 part and 95-99.5 part water;
The composition of described water-soluble hydrophobic associated polymkeric substance and tensio-active agent and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.01-3 part tensio-active agent and 92-99.79 part water; Tensio-active agent comprises: any one in C8-C18 alkyl sodium sulfonate, C8-C18 sodium alkyl benzene sulfonate and C8-C18 sodium alkyl sulfate or multiple;
The composition of described water-soluble hydrophobic associated polymkeric substance and water-swelling particle and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.1-10 part water-swelling particle and 85-99.7 part water; The water-swelling particle comprises: any one in water absorbing resin particle and water sucting rubber particle or multiple;
The composition of described water-soluble hydrophobic associated polymkeric substance and linking agent and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 0.01-2 part linking agent, 93-99.79 part water; Described linking agent comprises: phenolic aldehyde, Cr 3+And Al 3+In any one or multiple;
The composition of described water-soluble hydrophobic associated polymkeric substance and bridging plug patching materials and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.2-5 part, 1-10 part bridging plug patching materials, 85-98.8 part water; Described bridging plug patching materials comprises: any one in nut-shell, cotton seed hulls, rubber grain or multiple;
The composition of described water-soluble hydrophobic associated polymkeric substance and cement and water, in mass fraction, comprising: the water-soluble hydrophobic associated polymkeric substance of 0.5-5 part, 166.7-250 part cement, 95.0-99.5 part water; Described cement comprises: any one in oil well cement, rapid hardening cement and fibrocement or multiple.
6. the preparation method of a plugging agent claimed in claim 2, is characterized in that, comprising:
, raw material is added wherein and the formation monomer solution that stirs than adding deionized water according to metering; Then pass into nitrogen in monomer solution, and adopt chilled brine or thermal cycling water-bath to control polymerization temperature; Then add the initiator initiated polymerization in described monomer solution, form water-soluble hydrophobic associated polymeric colloid; After polyreaction finishes, described water-soluble hydrophobic associated polymeric colloid is ground into particle, adds sodium hydroxide or sodium carbonate to be hydrolyzed, and after drying, pulverizing and get final product;
Wherein, the total monomer concentration of described monomer solution is 15%-35%;
Described polymerization temperature scope is 5～50 ℃;
Described initiator is the composition of redox initiator and thermal initiator, and wherein oxygenant is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate; Reductive agent is one or more of S-WAT, sodium bisulfite, urea, trolamine; Thermal initiator is one or more of Diisopropyl azodicarboxylate, azo diisobutyl amidine hydrochloride, azo di-isopropyl imidazoline salt hydrochlorate and azo-bis-iso-dimethyl;
The concentration of described initiator is the 0.05-1% of comonomer total mass;
The dosage of described sodium hydroxide or sodium carbonate is the 2-5% of colloid quality;
The temperature of described hydrolysis is 75-95 ℃, and hydrolysis time is 2～4 hours;
Described drying temperature is 90-110 ℃, and be 2～4 hours time of drying.
7. the preparation method of plugging agent according to claim 6, is characterized in that, comprising:
The concentration of described initiator is the 0.2-0.5% of comonomer total mass.
8. the preparation method of a plugging agent claimed in claim 2, is characterized in that, according to metering,, than adding deionized water, raw material added wherein and the formation monomer solution that stirs; Add again sodium hydroxide or sodium carbonate, stir; Then pass into nitrogen in monomer solution, and adopt chilled brine or thermal cycling water-bath to control polymerization temperature; Then add the initiator initiated polymerization in monomer solution; After polyreaction finishes, water-soluble hydrophobic associated polymeric colloid is ground into particle, and after drying, pulverizing and get final product;
Wherein, the total monomer concentration of described monomer solution is 15%-35%;
Described polymerization temperature scope is 5～50 ℃;
Described initiator is the composition of redox initiator and thermal initiator, and wherein oxygenant is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate; Reductive agent is one or more of S-WAT, sodium bisulfite, urea, trolamine; Thermal initiator is one or more of Diisopropyl azodicarboxylate, azo diisobutyl amidine hydrochloride, azo di-isopropyl imidazoline salt hydrochlorate and azo-bis-iso-dimethyl;
The concentration of described initiator is the 0.05-1% of comonomer total mass;
The dosage of described sodium hydroxide or sodium carbonate is the 8-20% of comonomer total mass;
The temperature of described drying is 90-110 ℃, and be 2～4 hours time of drying.
9. the preparation method of plugging agent according to claim 8, is characterized in that, the concentration of described initiator is the 0.2-0.5% of comonomer total mass.
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