CN102504795A - Dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion - Google Patents
Dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion Download PDFInfo
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Abstract
The invention relates to a dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion. The pre-crosslinking gel particle for the profile control and the deep fluid flow diversion provided in the invention is a gel particle obtained by polymerizing and crosslinking a monomer, a stable crosslinking agent and an unstable crosslinking agent by an initiator to obtain a body gel, drying the gel and grinding the gel. The gel particle has a core-shell structure, wherein the stable crosslinking agent is polymerized and crosslinked with parts of the monomer to form the stable crosslinking core, and the unstable crosslinking agent is polymerized and crosslinked with parts of the monomer at the outside of the stable crosslinking gel core to form the unstable crosslinking gel coating shell. When the gel particle provided in the invention is applied to the oil reservoir exploitation, the dual effect of the profile control and the deep fluid flow diversion can be realized, and concentrations of the stable crosslinking agent and the unstable crosslinking agent can be adjusted to control the explosion time of the pre-crosslinking gel particle, so a purpose for controlling the working period can be reached.
Description
Technical field
The present invention relates to the gel particle that adopted in a kind of water-blocking operation of oil production, relate in particular to a kind of profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle, belong to technical field of petroleum extraction.
Background technology
Along with continually developing of oil field, the oil reservoir nonuniformity is more and more serious, injects water and washes away in a large number, and oil reservoir clay and cementing matter expand, corrosion, and fine migration shakes out to increase the weight of to wait and all can cause geology heterogeneous body situation further to worsen.Often show following problem on stream: horizontal contradiction is outstanding, and water is injected along the high permeability zone formation water channel of advancing by leaps and bounds in the plane; Interlayer contradiction is outstanding, produces that to inhale section inhomogeneous, has the individual layer phenomenon of advancing by leaps and bounds on vertically; Underground viscosity of crude is high, and oilwater viscosity ratio is big, and the viscous fingering phenomenon is serious etc.
At present, east oilfields has all got into high water-cut stage mostly, and the RF that how to improve high water-cut stage is an oil circle question of common concern.In recent years, though TOR measures such as polymer flooding have obtained good effect, also there are problems such as displacement of reservoir oil cost is high, the field conduct difficulty is big; Oil reservoir for serious heterogeneity, existence high infiltration band or " macropore "; Still exist partial wells to scurry and gather serious problem; Influenced to annotate and gathered effect; And, often do not reach intended purposes because the limitation of polymkeric substance itself makes its virtual viscosity loss in the stratum of high temperature, high salinity very big.The ternary composite driving technology also is widely used at maturing fields such as grand celebrations gradually; The effect that ternary composite driving utilizes tensio-active agent to reduce IT reduces capillary force significantly; Profit reaches mixed phase and flows, thereby starts the irreducible oil in the low-permeability oil deposit, but there is similar problem in the ternary composite driving technology with polymer flooding: shear shinning, influenced by reservoir condition; And polymer flooding and ternary composite driving all can pollute the oil-containing low infiltration layer, make follow-up water drive can not reach best effect.
The deep fluid diversion can overcome the deficiency of above-mentioned technology with amendment; At first amendment can macropore plugging and most permeable zone, forces to inject water and get into hyposmosis irreducible oil district, secondly along with the expansion of the profile control degree of depth; Can make and inject water entering surplus oil district, deep, start more surplus oil.Amendment commonly used at present has two types, and the one, gel-like, the 2nd, particulate species.
The gel-like amendment comprises body gel, weak gel and colloidal dispersed gel.The function of body gel mainly is the HS water breakthrough passage of shutoff immediate vicinity of wellbore, because form is a semi-solid state, therefore can't go deep into the stratum, is applicable to crack, immediate vicinity of wellbore and most permeable zone shutoff; Weak gel is main with intramolecular crosslinking, and intermolecular cross-linking is auxilliary, forms the more weak three-dimensional net structure of crosslinking degree; Characteristics with dehydration of body gel have certain integrity, can flow; But the distance of going deep into the stratum is limited, can not reach the effect of deep fluid diversion; Colloidal dispersed gel is that because the concentration of polymkeric substance and linking agent is low, the intermolecular chance that bumps is few through the gelling system of the non-three-dimensional net structure of the polymkeric substance of lower concentration and linking agent formation; The tridimensional network of unlikely formation intermolecular cross-linking; The main colloidal particle that is made up of the polymer molecule ball of string of intramolecular crosslinking is dispersed in the water medium, forms the thermodynamic stable system with gel attribute and colloidal property, and this system does not have globality; Do not have shape, can flow.The characteristics of colloidal dispersed gel are: cost is low, and gelation time is long, is fit to the deep profile controlling and the displacement of reservoir oil, is not suitable for crack and macropore, and the suitable reservoir temperature limit is 94 ℃, clear water preparation, bad adaptability.
The particulate species gel comprises polymer microballoon, volume expansion grain, flexible particle and microcapsule etc., and it adopts the method for precrosslink to have good heat-resistant salt-resistant, shear-stable ability.The rate of expansion of polymer microballoon receives the influence of WS, and the median size of the microballoon after the expansion is tens nanometers, shut-off capacity a little less than; Volume expansion grain can carry out the particle diameter adjustment according to different reservoir conditions, and expansion multiple is influenced by WS, makes intensity influenced less, because the volume expansion grain particle diameter is bigger, so the deep fluid diversion is limited in one's ability.Flexible particle can be migrated in the duct; Distortion is passed through; Produce temporarily stifled dynamic resistance, pulsation phenomenon is arranged, can realize the deep fluid diversion; Flexible particulate proportion can be adjusted according to the proportion of oilfield injection water, and particle diameter can be regulated according to oil field stratum " macropore " and fissured size.Flexible particle can form dynamic plugging at oil deposit deep part; But wash away crack and the superelevation pervious course that causes owing to current HS for nearly well; Must use the stifled agent of HS to carry out the anti-channeling operation, can not be brought into play to greatest extent otherwise the compliance steer agent improves the effect of RF.
In sum, up to the present, profile control, deep fluid diversion can not carry out synchronously in the water plugging and profiling technology of oil production, and not seeing any prior art can address this problem.
Summary of the invention
For solving the problems of the technologies described above; The object of the present invention is to provide a kind of pre-crosslinked gel particle; This pre-crosslinked gel particle is that a kind of profile control and deep flow are changeed difunctional explosion type pre-crosslinked gel particle, is particularly suitable for improving the RF in the oil field of high water-cut stage.
For achieving the above object; The pre-crosslinked gel particle that the present invention at first provides a kind of profile control and deep fluid diversion to use, it is to be caused through initiator by monomer, labile cross linker and astable linking agent the gel particle that the resulting body gel of polymerization crosslinking forms through drying and grinding takes place.This gel particle has nucleocapsid structure; Wherein, Said labile cross linker and partial monosomy form behind polymerization and glue couplet has the kernel that stable glue joins, and said astable linking agent and partial monosomy join formation in the outside polymeric gel of stable gel kernel and have the gel coat shell that astable glue joins.
In above-mentioned pre-crosslinked gel particle provided by the invention; Preferably; The body gel is at first to use labile cross linker and monomer under the initiation of initiator, to carry out precrosslink to form stable cross-linked particles, uses astable linking agent to be cross-linked to form once more in formed stable cross-linked particles outside under the initiation of initiator that astable glue joins coated shell then and the body gel that obtains.The addition of adjusting astable linking agent can make the precrosslink microparticle under specific reservoir temperature; At the appointed time interior explosion becomes microparticle; Therefore to different reservoir medias; Adopt the astable linking agent of different concns, can make the hydrolysis time of pre-crosslinked gel particle and the temperature can in good time hydrolysis in the oil reservoir of correspondence.
The preparatory glue of provided by the present invention pair of glue connection structure joins the preparatory glue couplet gel particle of the kernel (nuclear core) of gel particle for the stable glue connection of having of micron and submicron order structure; Externally secondary glue joins the gel coat shell that back formation has astable glue connection structure, and the particle diameter of gel shell can reach a millimeter rank.The preparatory glue of this geminus joins gel particle can realize two kinds of profile control mechanism synchronously; The i.e. superelevation pervious course in the shutoff oil reservoir at first; Explosion forms the micron-sized gel particle that stable glue joins that has under the reservoir temperature effect then, gets into oil deposit deep part, realizes two kinds of profile control mechanism synchronously.
Fig. 1 is the action principle synoptic diagram of pre-crosslinked gel particle of the present invention in oil reservoir.As can be seen from Figure 1; After pre-crosslinked gel particle injects oil reservoir; The expansible pre-crosslinked gel particle is at first macropore plugging and superelevation pervious course in the oil reservoir immediate vicinity of wellbore; Make and inject water entering low-permeability layer district's startup irreducible oil, the expansible pre-crosslinked gel particle keeps shape can under the reservoir temperature effect, be decomposed into micron order gel particle and nano level gel particle after for some time.This generated in-situ micron order and nano level gel particle can continue to move into oil deposit deep part; And owing to be under the oil reservoir environment and after specifying blasting time (blasting time control can reach through the adjustment gel component); Gel particle just can be degraded into micron order and nano level gel particle, and Fig. 2 is the mechanism synoptic diagram of the expansion and the decomposition of pre-crosslinked gel particle of the present invention.As can be seen from Figure 2, gel particle expands in local water solution, under certain FT and pH value condition, and astable crosslinked fracture, particle deformation becomes micron order and nano level gel particle, can improve sweep efficiency.This shows that pre-crosslinked gel particle provided by the present invention can be realized the combination of the function of immediate vicinity of wellbore most permeable zone shutoff and oil deposit deep part fluid diversion.
The monomer that pre-crosslinked gel particle adopted is preferably acrylic amide; Perhaps acrylic amide and vinylformic acid and/or other monomeric mixture; Wherein, when adopting acrylic amide to mix mutually with vinylformic acid, the mass ratio of the two may be controlled to 9: 1; When adopting other monomer, its addition is identical with vinylformic acid.In above-mentioned composition; With acrylic amide is main; A certain proportion of vinylformic acid that can add as required simultaneously and/or other monomer can with acrylic amide generation copolyreaction, can make gel keep temperature within a certain period of time, do not degrade, being kept perfectly property; Can avoid crosslinked like this, the astable linking agent problem that (being under the reservoir media) can degrade or decompose under the situation that lime carbonate exists because adopt astable linking agent to carry out.
According to concrete technical scheme of the present invention; Preferably, above-mentioned other monomer that adopts comprises one or more in 2-acrylamido-2-methyl propane sulfonic acid sodium salt (AMPS), methylacrylic acid (methacrylic acid), maleic acid (maleic acid), 2-vinylformic acid (2-Propenoic acid), sulfopropyl vinylformic acid (sulfopropyl acrylic acid), dimethylaminoethylacmethyl methyl chloride (dimethylaminoethylacrylate methyl chloride quaternary salt) and the dimethyl diallyl ammonium chloride (diallyldimethyl ammonium chloride) etc.
According to concrete technical scheme of the present invention; Preferably, the labile cross linker that pre-crosslinked gel particle adopted comprises one or more in 2-acrylamido-2-methyl propane sulfonic acid sodium salt, divinyl acid esters, TGM 1, vinylformic acid trimethyl propane trimethylammonium ester and the methene base bisacrylamide etc.
According to concrete technical scheme of the present invention; Preferably; The astable linking agent that pre-crosslinked gel particle adopted comprises polyethyleneglycol diacrylate (polyethylene glycol diacrylate), polyethylene glycol dimethacrylate (polyethylene glycol dimethacrylat), polyoxyethylene glycol, one or more in polypropylene glycol diacrylate (polypropylene glycol diacrylate), glycol diacrylate (ethylene glycol diacrylate), three methanol-based propane, three acrylic acid fat (trimethylopropane trimethacrylate), oxyethyl group tri methylol triacrylate (ethoxylated trimethylol triacrylate), oxyethyl group tetramethylol methane tetraacrylate (ethoxylated pentaerythritol tetracrylate) and their verivate etc.
According to concrete technical scheme of the present invention, the initiator that pre-crosslinked gel particle adopted is preferably vitriolate of tartar (K
2S
2O
8), in ammonium persulphate and Tetramethyl Ethylene Diamine (TMTDA) etc. one or more, more preferably ammonium persulphate.Above-mentioned initiator is used for monomer A M is inspired polyreaction, all is normal starter, and initiator concentration also can be a conventional amount used.In twice polymerization crosslinking process, said initiator and said monomeric mass ratio all may be controlled to 1 during polymerization crosslinking each time: 300-5000.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, labile cross linker and monomeric ratio are 1: 200-8000, this monomer are meant the monomer with this labile cross linker generation polymerization crosslinking.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, astable linking agent and monomeric mass ratio are 1: 300-3000, this monomer are meant the monomer with this astable linking agent generation polymerization crosslinking.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, initiator and monomeric mass ratio may be controlled to 1: 300.
According to concrete technical scheme of the present invention, preferably, the particle diameter of the pre-crosslinked gel particle that the present invention adopted is the 100-120 order, about 125-150 μ m.
The temperature range for hydrolysis of the pre-crosslinked gel particle that polymerization provided by the present invention obtains is bigger, to different oil reservoirs, can have different hydrolysis times.
The present invention also provides the preparation method of the pre-crosslinked gel particle that above-mentioned profile control and deep fluid diversion use, and it may further comprise the steps:
(1) acrylic amide (when adopting vinylformic acid with other monomer, can add in the lump) is added fully dissolving in the zero(ppm) water, obtaining mass percent is monomer first solution of 10%-50%;
(2) be that the solvent preparation obtains the labile cross linker solution that concentration is 0.01%-0.1% with zero(ppm) water;
(3) with (ratio of the two can be confirmed through labile cross linker and monomeric mass ratio in labile cross linker solution adding monomer first solution; Labile cross linker and with the monomeric mass ratio of its generation polymerization crosslinking be 1: 200-8000), obtain first mixing solutions;
(4) nitrogen injection purifies 15-60 minute in first mixing solutions;
(5) to adding initiator through in first mixing solutions of nitrogen purge, after stirring, the thermostat container of putting into 45-80 ℃ is incubated 5-12 hour, obtains gelatigenous gel piece;
(6) gel piece is cut into small pieces and dry, obtains stablizing the cross linked gel piece;
(7) acrylic amide (when adopting vinylformic acid with other monomer, can add in the lump) is added fully dissolving in the zero(ppm) water, obtaining mass percent is monomer second solution of 10%-50%;
(8) be the astable cross-linking agent solution of 0.1%-1% with zero(ppm) water for the solvent compound concentration;
(9) with (ratio of the two can be confirmed through astable linking agent and monomeric mass ratio in astable cross-linking agent solution adding monomer second solution; Astable linking agent and with the monomeric mass ratio of its generation polymerization crosslinking be 1: 200-8000), stir 2-4 hour even fully up to solution;
(10) nitrogen injection purifies 15-60 minute in solution;
(11) in solution, add the initiator of 0.1g, and stir 2-4 hour, form second mixing solutions up to fully evenly;
(12) will be exsiccant stablize the cross linked gel piece and grind to form particle, obtain stablizing the cross linked gel particle;
(13) will stablize second mixing solutions that the cross linked gel particle is put into step (11), leave standstill 24 hours;
(14) mixing solutions that step (13) is formed is put into 60 ℃ thermostat container insulation 24 hours, obtains the body gel, obtains profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle after the drying and grinding.
In above-mentioned preparation method provided by the invention, preferably, synthetic body gel repeats 3 expansions, purification, exsiccant process; To purge the impurity in the gel; Expansion can be carried out in zero(ppm) water, makes the body gel under 60 ℃, carry out drying then, and the dry body gel after the purification grinds to form small-particle; Obtain the exsiccant gel particle through behind the sieve series; This exsiccant gel particle adds in the astable cross linked gel solution and carries out secondary crosslinking then, and the astable gel that secondary crosslinking forms is crosslinked in the outside of stablizing cross-linked particles, thereby obtains the body gel.
The present invention also provides a kind of flooding method, and the method that its pre-crosslinked gel particle that is above-mentioned profile control of employing and deep fluid diversion are used carries out displacement of reservoir oil operation may further comprise the steps:
In the injection device of ground, use injection water (to inject water according to site operation equipment situation; Adopt return water or clear water) profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle are mixed with stabilizing solution; Strength of solution is confirmed according to the oil reservoir situation, then stabilizing solution is injected high watercut layer, wherein; In stabilizing solution; Profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle concentration confirm that according to the scale of down-hole macropore and most permeable zone preferably, the particulate mass percentage content is 0.1%-0.6%.After pre-crosslinked gel particle gets into high watercut layer; The at first macropore of shutoff immediate vicinity of wellbore and superelevation pervious course; Force injection water preferentially to get into low permeability layer irreducible oil district and start irreducible oil; Millimeter level pre-crosslinked gel particle explosion after the period that process under the effect of FT is set of shutoff immediate vicinity of wellbore becomes micron order and nano level small-particle, gets into oil deposit deep part, plays the effect of deep fluid diversion.
The pre-crosslinked gel particle that profile control provided by the invention and deep fluid diversion are used is when being used for the oil reservoir exploitation; Can realize the double effects of profile control and deep fluid diversion; Can control the blasting time of pre-crosslinked gel particle through the concentration of adjustment labile cross linker and astable linking agent simultaneously, thereby reach the control purpose of working cycle.
In the practice of construction of prior art; Usually need be before injecting amendment; Strong washing layer is carried out the anti-channeling operation, and improving follow-up deep fluid diversion efficiency of operation, and pre-crosslinked gel particle provided by the present invention combines the function of anti-channeling and polymer flooding; Can simplify complicated profile control and deep fluid diversion operation, practice thrift cost.
Description of drawings
Following accompanying drawing only is intended to the present invention is done schematic illustration and explanation, not delimit the scope of the invention.Wherein:
Fig. 1 is the action principle synoptic diagram of pre-crosslinked gel particle of the present invention in oil reservoir;
Fig. 2 is the mechanism synoptic diagram of the expansion and the decomposition of pre-crosslinked gel particle of the present invention;
Fig. 3 is the synoptic diagram of the three-dimensional oil reservoir physical model among the embodiment 4;
Fig. 4 is the pressure history in the oil displacement process;
Fig. 5 is the RF change curve in the oil displacement process.
Embodiment
To understand in order technical characterictic of the present invention, purpose and beneficial effect being had more clearly, with reference to Figure of description technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as qualification at present practical range of the present invention.
The pre-crosslinked gel particle that present embodiment provides a kind of profile control and deep fluid diversion to use has following raw material and forms:
Wherein, labile cross linker and monomeric ratio are 1: 3000, and astable linking agent and monomeric ratio are 1: 300.
The pre-crosslinked gel particle that profile control that present embodiment provides and deep fluid diversion are used prepares according to following steps:
30 gram acrylic amides are added fully dissolving in the 100 gram zero(ppm) water, obtain acrylamide soln, i.e. monomer first solution;
1g methene base bisacrylamide is added fully dissolving in the 100 gram zero(ppm) water, obtain methene base bisacrylamide solution, i.e. labile cross linker solution;
1g methene base bisacrylamide solution is added in the acrylamide soln, obtain first mixing solutions;
Nitrogen injection purifies 15 minutes in first mixing solutions;
In through first mixing solutions that purifies, adding 0.1g concentration is the ammonium persulfate solution of 1000ppm, then solution is put into 60 ℃ of thermostat container insulation reaction 5 hours, obtains the body gel;
Take out gelatigenous body gel, the stable cross linked gel piece that is cut into small pieces, and drying for standby;
After abundant dissolving in 0.1 gram polypropylene glycol diacrylate and 30 gram acrylic amides addings, the 69.9 gram zero(ppm) water, obtained adding monomer second solution of astable linking agent;
Nitrogen injection purifies 15 minutes in monomer second solution;
Add ammonium persulfate solution and fully stirring that 0.1g concentration is 1000ppm in monomer second solution after purifying, obtain second mixing solutions;
Exsiccant is stablized the cross linked gel particle grind to form micron particles, put into abundant immersion of second mixing solutions and left standstill 24 hours;
Containing after leaving standstill stablized cross linked gel particulate second mixing solutions put into 60 ℃ of thermostat container insulation reaction 24 hours, obtain the body gel, obtain the pre-crosslinked gel particle that profile control and deep fluid diversion are used after the drying and grinding.
The hydrolysis test
Test procedure: the pre-crosslinked gel particle that the profile control and the deep fluid diversion of embodiment 1 preparation used is dissolved in the NaCl solution of concentration as 1wt% and obtains mixing solutions; Observe the hydrolysis situation of gel particle; Wherein, In mixing solutions, the concentration of gel particle is 2000ppm, and the temperature of mixing solutions is respectively 80 ℃, 60 ℃, 45 ℃;
Test result: when the temperature of mixing solutions was 80 ℃, pre-crosslinked gel particle is hydrolyzed into micron particles solution needed 12 days, and the micron particles soltion viscosity that obtains after the hydrolysis is 170cp; When the temperature of mixing solutions was 60 ℃, the pre-crosslinked gel particle complete hydrolysis needed 80 days, and the micron particles soltion viscosity that obtains after the hydrolysis is 290cp; When the temperature of mixing solutions was 45 ℃, pre-crosslinked gel particle did not yet have complete hydrolysis after half a year; Wherein, when the temperature of mixing solutions was 80 ℃, 60 ℃, the difference of resulting micron particles soltion viscosity was that the main chain instability at high temperature owing to polymer molecule ruptures and causes.Through above-mentioned test specification, the pre-crosslinked gel particle that present embodiment provides has good hydrolysis property, can adapt to the requirement of oil well depth profile control operation, and its blasting time can be controlled, thereby controls working cycle.
The seepage flow test
Have three pressure transmitters, length is that 52cm, diameter are 5cm
2Back-up sand rock core model on carry out the seepage flow experiment of the gel particle that embodiment 1 provides.
Experimental procedure: 40 order silica sands are inserted in the sandpipe model, and compacting vacuumized 8 hours, saturation simulation local water, record cast volume of voids; Inject water, measure injection pressure and calculate water phase permeability; Compound concentration is the pre-crosslinked gel particle solution of 0.2wt% then, and leaves standstill 15 days at 80 ℃, after the complete hydrolysis, injects sandpipe model (IR (volume) is 0.1 times of total pore size volume), the pressure change along 3 pressure taps of journey in the record injection process.After gelating soln inject to be accomplished, continue water filling (IR is 1 times of total pore size volume), in the record the injecting process along the pressure change of each pressure tap of journey.Calculate the RF of each section of sand-packed model according to the pressure change of each point in the gel injection process, according to the residual resistance factor of each section of pressure change computation model of each point in the water drive process of back.
Experimental result (as shown in table 1) shows: the RF of gel particle and residual resistance factor have all reached design requirements.
Table 1 one-dimensional model seepage flow experimental result
The pre-crosslinked gel particle that present embodiment provides a kind of profile control and deep fluid diversion to use has following raw material and forms:
Wherein, labile cross linker and monomeric ratio are 1: 3000, and astable linking agent and monomeric ratio are 1: 300.
The preparation process of the pre-crosslinked gel particle that profile control that present embodiment provides and deep fluid diversion are used can reference implementation example 1, other are all identical except the consumption of raw material and additive.
The pre-crosslinked gel particle that present embodiment provides a kind of profile control and deep fluid diversion to use has following raw material and forms:
Wherein, labile cross linker and monomeric ratio are 1: 3000, and astable linking agent and monomeric ratio are 1: 300.
The preparation process of the pre-crosslinked gel particle that profile control that present embodiment provides and deep fluid diversion are used can reference implementation example 1, other are all identical except the consumption of raw material and additive.
1, model
Geologic information according to the zone, oil field is set up three-dimensional non-homogeneous model; Model volume 500mm * 500mm * 150mm; In model, arrange 30 differential pressure pickups and 31 saturation ratio measuring probes, 30 differential pressure pick-ups, on the branch in following three layers of distribution; Every layer of 10 differential pressure pick-up that distributes, three layers of differential pressure pick-up are respectively 2.5mm, 7.5mm, 12.5mm apart from the distance bottom the model; Two diagonal angles of model are arranged a copper pipe that vertically connects model respectively as injecting well and recovery well, and the long 10cm of well, perforation density are 4 of perforations on the cross section of every 1cm, and angle 90 degree between two holes wrap gauze.The synoptic diagram of above-mentioned three-dimensional oil reservoir physical model is seen Fig. 3.
2, displacement of reservoir oil step:
In model, inject local water and make it saturated, the water phase permeability of measurement model and volume of voids in this process;
Inject crude oil and make it saturated to model, write down saturated former oil mass, saturated altogether former oil mass is 7652mL;
Carry out water drive and reach 95% up to water ratio, the salinity of the employed injection water of water drive is 5000ppm, and injection speed is 0.5mL/min;
After water drive is accomplished, inject the pre-crosslinked gel particle that the embodiment 1 of 0.1PV provides with the speed of 0.5mL/min;
After the pre-crosslinked gel particle that injection embodiment 1 provides, continue water drive 1PV again, closing well is heated to 80 ℃ then, keeps 3 months, drives a well then, and water drive to water ratio is 95%.
The basic physical-property parameter of model is seen table 2, and dispersion gel particle injection parameter is seen table 3.
Table 2 three-dimensional physical model physical-property parameter
Table 3 injection parameter
| Type | Form | Inject volume | Injection speed |
| I type dispersion gel granular system | Body gel before the explosion | 0.05PV | 0.1mL/min |
3, interpretation of result
The first time pressure-stabilisation during water drive about 10KPa, pressure rises to 1.5MPa rapidly when injecting gel particle, when carrying out water drive once more, pressure drops to 1MPa; In the continuation water drive process after closing well keeps 80 ℃ to drive a well again, injection pressure drops to 600KPa and keeps stable, and Fig. 4 is the pressure history in the oil displacement process.Oil recovery factor has improved 3% after injecting gel particle, under reservoir temperature, keeps recovering water drive after 3 months, improves RF 6%, always improves RF 9%.Fig. 5 is the RF change curve in the oil displacement process.
Claims (10)
1. the pre-crosslinked gel particle used of profile control and deep fluid diversion; It causes the gel particle that the resulting body gel of generation polymerization crosslinking forms through drying and grinding by monomer, labile cross linker and astable linking agent through initiator; This gel particle has nucleocapsid structure; Wherein, Said labile cross linker and partial monosomy form behind polymerization and glue couplet has the kernel that stable glue joins, and said astable linking agent and partial monosomy form at the outside polymeric gel couplet of the gel kernel of stablizing the glue couplet has the gel coat shell that astable glue joins.
2. pre-crosslinked gel particle according to claim 1; Wherein, Said body gel is at first to use labile cross linker and monomer under the initiation of initiator, to carry out precrosslink to form stable cross-linked particles, uses astable linking agent to be cross-linked to form once more in formed stable cross-linked particles outside under the initiation of initiator that astable glue joins coated shell then and the body gel that obtains.
3. pre-crosslinked gel particle according to claim 1 and 2, wherein, said monomer is acrylic amide or acrylic amide and vinylformic acid and/or other monomeric mixture.
4. pre-crosslinked gel particle according to claim 3; Wherein, said other monomer comprises one or more in 2-acrylamido-2-methyl propane sulfonic acid sodium salt, methylacrylic acid, maleic acid, 2-vinylformic acid, sulfopropyl vinylformic acid, dimethylaminoethylacmethyl methyl chloride and the dimethyl diallyl ammonium chloride.
5. pre-crosslinked gel particle according to claim 1 and 2; Wherein, Said labile cross linker comprises one or more in 2-acrylamido-2-methyl propane sulfonic acid sodium salt, divinyl acid esters, TGM 1, vinylformic acid trimethyl propane trimethylammonium ester and the methene base bisacrylamide; Preferably, said labile cross linker and said monomeric mass ratio are 1: 200-8000, said monomer are meant the monomer with said labile cross linker generation polymerization crosslinking.
6. pre-crosslinked gel particle according to claim 1 and 2; Wherein, said astable linking agent comprises one or more in polyethyleneglycol diacrylate, polyethylene glycol dimethacrylate, polyoxyethylene glycol, polypropylene glycol diacrylate, glycol diacrylate, three methanol-based propane, three acrylic acid fat, oxyethyl group tri methylol triacrylate, oxyethyl group tetramethylol methane tetraacrylate and their verivate; Preferably, said astable linking agent and said monomeric mass ratio are 1: 300-3000, said monomer are meant the monomer with said astable linking agent generation polymerization crosslinking.
7. pre-crosslinked gel particle according to claim 1 and 2; Wherein, Said initiator is one or more in vitriolate of tartar, ammonium persulphate and the Tetramethyl Ethylene Diamine; Preferably, in twice polymerization crosslinking process, said initiator and said monomeric mass ratio are 1 during polymerization crosslinking each time: 300-5000.
8. pre-crosslinked gel particle according to claim 1 and 2, wherein, the particle diameter of said profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle is the 100-120 order.
9. the preparation method of the pre-crosslinked gel particle of using according to each described profile control of claim 1-8 and deep fluid diversion, it may further comprise the steps:
(1) acrylic amide is added fully dissolving in the zero(ppm) water, obtaining mass percent is monomer first solution of 10%-50%;
(2) be that the solvent preparation obtains the labile cross linker solution that concentration is 0.01%-0.1% with zero(ppm) water;
(3) labile cross linker solution is added in monomer first solution, obtain first mixing solutions;
(4) nitrogen injection purifies 15-60 minute in first mixing solutions;
(5) to adding initiator through in first mixing solutions of nitrogen purge, after stirring, the thermostat container of putting into 45-80 ℃ is incubated 5-12 hour, obtains gelatigenous gel piece;
(6) gel piece is cut into small pieces and dry, obtains stablizing the cross linked gel piece;
(7) acrylic amide is added fully dissolving in the zero(ppm) water, obtaining mass percent is monomer second solution of 10%-50%;
(8) be the astable cross-linking agent solution of 0.1%-1% with zero(ppm) water for the solvent compound concentration;
(9) astable cross-linking agent solution is added in monomer second solution, stir 2-4 hour even fully up to solution;
(10) nitrogen injection purifies 15-60 minute in solution;
(11) in solution, add the initiator of 0.1g, and stir 2-4 hour, form second mixing solutions up to fully evenly;
(12) will be exsiccant stablize the cross linked gel piece and grind to form particle, obtain stablizing the cross linked gel particle;
(13) will stablize second mixing solutions that the cross linked gel particle is put into step (11), leave standstill 24 hours;
(14) mixing solutions that step (13) is formed is put into 60 ℃ thermostat container insulation 24 hours, obtains the body gel, obtains said profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle after the drying and grinding.
10. flooding method, it is the method that pre-crosslinked gel particle of adopting claim each described profile control of 1-8 and deep fluid diversion to use carries out displacement of reservoir oil operation, may further comprise the steps:
In the injection device of ground, use injection water that said profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle are mixed with stabilizing solution; Then stabilizing solution is injected high watercut layer; Wherein, In stabilizing solution, the mass percentage content of said profile control and the difunctional explosion type of deep fluid diversion pre-crosslinked gel particle is 0.1%-0.6%.
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