CN105399895A - Resistance reducing agent, resistance reducing solution containing resistance reducing agent, and application of resistance reducing solution - Google Patents
Resistance reducing agent, resistance reducing solution containing resistance reducing agent, and application of resistance reducing solution Download PDFInfo
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- CN105399895A CN105399895A CN201410433259.5A CN201410433259A CN105399895A CN 105399895 A CN105399895 A CN 105399895A CN 201410433259 A CN201410433259 A CN 201410433259A CN 105399895 A CN105399895 A CN 105399895A
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Abstract
The invention provides a resistance reducing agent, a resistance reducing solution containing the resistance reducing agent, and an application of the resistance reducing solution, and belongs to the field of a gas well fracturing agent. The resistance reducing agent is prepared from acrylamide, an ester monomer A, and a cationic monomer B according to a molar ratio of (1-4):0.5:(0.5-1) through random copolymerization of inverse emulsion polymerization, wherein the ester monomer A is a specific esterification product prepared from methacrylic acid and/or acrylic acid and glycerol; the cationic monomer B is allyltrimethylammonium chloride or methacrylatoethyl trimethyl ammonium chloride; and the obtained copolymer has a viscosity average molecular weight being 5*10<5>-8*10<5>. The resistance reducing solution containing the resistance reducing agent is high in resistance reducing efficiency. The resistance reducing agent is degradable, thereby causing no damage to a reservoir stratum.
Description
Technical field
The present invention relates to a kind of for the friction reducer in gas well fracturing volume increase, comprise falling of this friction reducer and block water and apply.
Background technology
(unconventional reservoir, unconventional gas well are a kind of sayings of in recent years rising to the unconventional reservoir such as shale gas, tight gas, mainly refer to the reservoir that rate of permeation is low and gas well) become the focus of oil-gas exploration and development, practice shows, needs the volume fracturing carrying out extensive, high discharge capacity could realize benefit exploitation in the well development of the non-conventional gas such as tight sand, shale gas reservoir.In the U.S., volume fracturing is the Main Yield-increasing mode of shale gas reservoir, and the construction liquid measure of typical water horizontal well volume fracturing is at 20000 ~ 30000m
3.In Changning, Sichuan-and national shale gas demonstration area, Weiyuan, a bite vertical well fracture construction liquid measure is also at 1500 ~ 2500m
3, horizontal well 20000 ~ 30000m
3.Operational discharge capacity 10 ~ 14m
3/ min.Adopt conventional fracturing fluid system frictional resistance high, cost is high, large to the injury of reservoir, is difficult to the requirement meeting the exploitation of unconventional reservoir benefit, therefore usually adopt in the exploitation of unconventional reservoir and fall the fracturing liquid that blocks water and carry out stimulation work, wherein falling blocks water is also called slippery water.
US2009/0318313A1 discloses a kind of slippery water formula, by water, poly-propionic acid amide, stablize peroxide gel breaker, sterilant, clay stabilizer form, poly-propionic acid amide concentration is 0.001% ~ 5%, gathers the molecular weight 1 × 10 of propionic acid amide
3~ 2 × 10
7, even higher, peroxide breaker concentration is 0.001% ~ 20%.
Chinese patent literature CN102516975A and CN103275691A discloses and a kind of recyclablely falls the formula that blocks water, the emphasis of this formula be solution fall block water instant, recyclable.
Chinese patent literature CN103045226A disclose a kind of friction reducer and preparation method thereof with use this friction reducer the fracturing liquid and preparation method thereof that blocks water falls.
Above prior art solves falls the formula that blocks water, instant and fall the problem blocking water and recycle and reuse, but shortcoming is: the friction reducer falling the middle high molecular that blocks water residual after pressing crack construction cannot be degraded, and can cause certain injury to reservoir.
Summary of the invention
Goal of the invention
An object of the present invention is to provide a kind of friction reducer, resistance reducing effect is good, and degradable, to reservoir fanout free region.
Another object of the present invention is to provide and a kind ofly comprises falling of above-mentioned friction reducer and block water, and it is high that this falls resistance-reducing yield when being applied to unconventional gas well that blocks water, and to reservoir fanout free region.
Another object of the present invention is to provide above-mentionedly falls the application blocked water in the construction of unconventional gas well volume fracturing.
In the present invention, described unconventional gas well refers to that rate of permeation is less than the gas well of 0.1mD (millidarcy).
Summary of the invention
Described friction reducer, by acrylamide, esters monomer A and cationic monomer B by 1 ~ 4): 0.5:(0.5 ~ 1) mol ratio obtain through inverse emulsion polymerization random copolymerization, wherein said esters monomer A is the carboxylate of methacrylic acid and/or vinylformic acid and glycerol, and structural formula is
Wherein, R1, R2 are H or-CH
3;
Described cationic monomer B is allyl group trimethyl ammonium chloride or MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and the viscosity-average molecular weight of gained multipolymer is 5 × 10
5~ 8 × 10
5.
The mol ratio of preferred acrylamide, esters monomer A and cationic monomer B is (1 ~ 2): 0.5:(0.5 ~ 1).
Preferred inverse emulsion polymerization condition is: temperature of reaction is 63 ~ 65 DEG C, and the reaction times is 4 ~ 5h, and initiator is azo diisobutyl amidine hydrochloride (hereinafter referred to as V50).
Above-mentioned inverse emulsion polymerization reaction gained direct product is the copolymer emulsion of acrylamide and esters monomer A, cationic monomer B, and wherein the mass percent concentration of effective constituent is 25% ~ 40%.The mass percent concentration of described effective constituent to be multiplied with reaction conversion ratio according to the monomer total mass added and to obtain, the testing method of described reaction conversion ratio is: take reacted emulsion and join in dehydrated alcohol or acetone, get solid after after abundant precipitation to dry and weigh, reaction conversion ratio is the ratio that quality and the reaction of drying adds monomer total mass.Described copolymer emulsion can directly be applied as friction reducer emulsion, applies after the effective constituent also can purified wherein again.When temperature is higher than 70 DEG C, the ester structure of friction reducer decomposes, thus is degraded into small molecules, and to reservoir fanout free region, recovery of core permeability is high, and resistance reducing effect is good simultaneously, and the resistance-reducing yield that blocks water that falls comprising this friction reducer reaches 73% ~ 78%.
Described falling blocks water, and comprises above-mentioned friction reducer.Fall the composition blocked water preferably to comprise by weight percentage
Friction reducer emulsion 0.02% ~ 0.08%
Transporting agent 0.5% ~ 1%
Wherein, described friction reducer emulsion comprises above-mentioned friction reducer, and effective constituent concentration is 25% ~ 40%, and described transporting agent is acid fiber by polylactic and/or ester fibrid, the staple length of described acid fiber by polylactic is 5-12mm, and the degradation temperature of described acid fiber by polylactic is 70-120 DEG C; The staple length of described ester fibrid is 5-12mm, and the degradation temperature of described ester fibrid is 70-120 DEG C.More preferably described ester fibrid is at least one in ethyl lactate fiber, ethyl acetate fiber, methyl acetate fiber.
As further preferred version, described falling blocks water to form and is by weight percentage
Surplus is water.
The mass percent of preferred described friction reducer emulsion is 0.02% ~ 0.05%.
Described cleanup additive, expansion-resisting agent, sterilant can select this area to commonly use material by consumption routinely.
Preferably, the mass percent of described cleanup additive consists of:
Surplus is water.
Described C7-C8 polyoxyethylene-type fluorocarbon surfactant is preferably FC-1010, and described C7-C9 fatty alcohol-polyoxyethylene ether is preferably peregal o-20.
Described expansion-resisting agent is preferably quaternary ammonium salt expansion-resisting agent.Be more preferably ammonium chloride and/or tetramethyl ammonium chloride.
Described sterilant is preferably glutaraldehyde and/or dazomet.
Fall the system that blocks water and adopt ordinary method configuration.Indoor preparation this fall when blocking water system, adopt mixed tune device, first friction reducer is added in mixed tune device, stirring velocity 800r/min-1000r/min, then cleanup additive is added, expansion-resisting agent, sterilant, after whole system stirs, slowly add transporting agent, initial 10s stirring velocity 1000r/min, then be at the uniform velocity reduced to 800r/min, be added to the water and stir 20-60s, it is even to fall the system of blocking water.
Above-mentioned fall block water can be used for unconventional gas well volume fracturing construction.
Effect of the present invention is
(1) adopt after transporting agent, fall block water in form reticulated structure, significantly reduce the settling velocity of propping agent, improve fall block water take grittiness energy;
(2) transporting agent degradable in crack returns and discharges ground, does not affect the flow conductivity in crack, to reservoir fanout free region after pressure break;
(3) transporting agent and the present invention preferably fall and block water in other additive there is excellent compatibility, do not affect the resistance-reducing performance falling and block water;
(4) fall to block water and return discharge opeing and can reuse after treatment;
(5) fall the resistance-reducing yield that blocks water high, resistance-reducing yield 73%-78%, when temperature is higher than 70 DEG C, friction reducer is degraded into small molecules, and to reservoir fanout free region, recovery of core permeability is high;
(6) friction reducer can be applied to salinity and is less than or equal to 2 × 10
5in the concentrated water of mg/L.
Accompanying drawing explanation
Fig. 1 is that falling of preparing after embodiment 1 volume fracturing returns discharge opeing process blocks water and fall the resistance-reducing performance comparison diagram that blocks water with newly preparing.
Embodiment
Below further the present invention will be described by specific embodiment.
In following examples involved testing method and treatment process as follows:
Viscosity-average molecular weight testing method: with reference to GB/T265-88 test method, record the kinematic viscosity of liquid, then calculate molecular weight.Present method is under a certain constant temp, and the liquid measuring certain volume flows through the time of the glass capillary tube viscometer that has been demarcated under gravity, and the capillary constant of viscometer and the product of flowing time, measure the kinematic viscosity of liquid under being this temperature.
Kinematic viscosity testing method: with reference to GB/T10247 Viscosity Measurement Methods, record the kinematic viscosity of liquid, probe temperature 30 DEG C.
Static sand setting measuring method falls to block water by formula be positioned in static sand sediment pipe by what prepare, after falling in static sand sediment pipe blocks water and is warmed up to 95 DEG C, add 40-70 object and grasp positive ceramsite propping agent, the settling height of record 1min propping agent draws settling velocity.
Resistance-reducing yield measuring method: carry out following test according to Chinese patent ZL01320092441X " a kind of fracturing liquid pipeline frictional resistance determinator " described apparatus and method: the clear water adding test aequum in circulation container for storing liquid, the rotating speed of slow adjustment power-driven pump, makes whole test pipeline be full of test liquid.Open temperature control heating system, setting probe temperature, motivation of adjustment revolution speed reaches setting linear velocity or Reynolds number, after the discharge capacity on liquid meter and the temperature reading on temperature detector are stablized, reads the pressure reduction of clear water this linear velocity or Reynolds number from computer.Then fall to block water according to same program test and flow through the pressure reduction of this pipeline.Probe temperature can adopt room temperature or fall the use temperature that blocks water, tubing internal diameter >=8mm during experiment, house line speed >=10m/s (Reynolds number >=80000, shearing rate >=10000).Resistance-reducing yield is calculated according to SY/T5107-2005 " aqueous fracturing fluid method of evaluating performance ".
Recovery of core permeability testing method: reference standard SY/T5107-2005 " aqueous fracturing fluid performance evaluation ".
Return discharge opeing treatment process: return discharge opeing from well head out after, enter in equalizing tank, in equalizing tank, pH adjusting agent can be added in advance as required, sterilant etc.Then entering retort utilizes chemical precipitation method to remove the high valent cationic (calcium, magnesium, iron etc.) returned in discharge opeing, then makes throw out with flucculation process and suspended solids is agglomerating, rapid subsidence.Refilter the suspended solids and aqueous phase that are separated and return in discharge opeing.Discharge opeing of returning after filtration is left in water tank, if after testing on falling block-water performance without impact, and can direct reuse without scaling tendency.
Producer raw materials used in following examples and model as follows:
Glycerol dimethacrylate: the purple chemical reagent work in Shanghai, purity 90%
Fatty alcohol-polyoxyethylene ether peregal o-20: purchased from Hai'an, Jiangsu petroleum chemical plant
Octanol: purchased from Qilu Petrochemical
Fluorocarbon surfactant FC-1010: purchased from Qingdao Ke Mo Chemical Co., Ltd.
EDETATE SODIUM (disodium ethylene diamine tetraacetate): Cologne, Chengdu chemical reagent factory, analytical pure
Initiator V50: Chemical Reagent Co., Ltd., Sinopharm Group, analytical pure
Span-80 (sorbitan monooleate): Cologne, Chengdu chemical reagent factory, analytical pure
Span-85 (Witconol AL 69-66): Zhejiang Province Long Youxian gathers emerging grain and oil medication chemistry company limited
(embodiment 1)
To participate in the raw material total mass of inverse emulsion polymerization for benchmark, by following concrete steps synthesis friction reducer emulsion:
1) preparation of aqueous phase: 40.17g glycerol dimethacrylate, 47.73g allyl group trimethyl ammonium chloride, 25g acrylamide are dissolved in distilled water water, and add 0.15gEDTA disodium, adds 0.045g initiator V50 before emulsification, be uniformly dissolved.
2) preparation of oil phase: the white oil 64g and emulsifying agent Span-80 (4%, 12.8g), the span85 (1%, 3.2g) that take mass ratio 20%.
3) emulsification: drip aqueous phase, stirring velocity 2000r/min during dropping under logical smart nitrogen (namely purity is the nitrogen of 99.99%) condition, time for adding is 65-75min.30min is stirred again after dropwising.
4) react: control heat-up rate, be warmed up to 63 ~ 65 DEG C, reaction 4 ~ 5h stopped reaction.
Get the mixed tune device that 495.125ml distilled water is placed in 1000ml volume, add 0.35g friction reducer emulsion (molecular weight of copolymer 550,000 successively, glycerol dimethacrylate: allyl group trimethyl ammonium chloride: acrylamide=0.5:1:1, effective constituent concentration 33.8%), stirring velocity 800r/min, stir 10s, add 1g cleanup additive (mass percent consists of: 1% fluorocarbon surfactant FC-1010+0.8% butyl glycol ether+3.8% octanol+10% peregal o-20+84.4% distilled water) again, 0.025g sterilant (mixture of 50% glutaraldehyde+50% dazomet), 0.5g tetramethyl ammonium chloride, finally add 2.5g acid fiber by polylactic (staple length: 7mm, degradation temperature 100 DEG C), initial 10s stirring velocity 1500r/min, then slowly 800r/min is reduced to, stirring 20s mixes to make to fall and blocks water.
Test result: falling the kinematic viscosity blocked water is 2.3mm
2/ s, falls the resistance-reducing yield 78% (normal temperature, caliber 8mm, linear velocity 10m/s) blocked water, falls the static sand setting speed 0.1mm/s that blocks water, recovery of core permeability 99.8%.
Above-mentioned falling blocked water after the application and construction of national shale gas demonstration area, Changning-Weiyuan, to returning discharge opeing, (kinematic viscosity is 0.73mm
2/ s, salinity 4.2 × 10
5mg/L) process.Return discharge opeing in equalizing tank, add pH adjusting agent sodium hydroxide (0.5%), citric acid (1%), sterilant glutaraldehyde (0.1%) carries out initial stage process to returning discharge opeing; Then entering retort utilizes sodium carbonate to remove the high valent cationic (calcium, magnesium etc.) returned in discharge opeing, then gathers propionic acid amide flocculation agent with negatively charged ion and makes throw out and suspended solids is agglomerating, rapid subsidence, refilter removal suspended solids.With returning the water that discharge opeing replaces in formula after process, being mixed with to fall by original formulation and blocking water, resistance-reducing yield 78% (normal temperature, caliber 8mm, linear velocity 10m/s).
(embodiment 2)
To participate in the raw material total mass of inverse emulsion polymerization for benchmark, by following concrete steps synthesis friction reducer emulsion:
1) preparation of aqueous phase: 40.17g glycerol dimethacrylate, 23.87g allyl group trimethyl ammonium chloride, 37.53g acrylamide are dissolved in distilled water water, and add 0.15gEDTA disodium, adds 0.05g initiator V50 before emulsification, be uniformly dissolved.
2) preparation of oil phase: take mass ratio 20% white oil 64g and emulsifying agent Span-80 (4%, 12.8g), span85 (1%, 3.2g).
3) emulsification: drip aqueous phase, stirring velocity 2000r/min during dropping under logical smart nitrogen condition, time for adding is 65-75min.30min is stirred again after dropwising.
4) react: control heat-up rate, be warmed up to 63 ~ 65 DEG C, reaction 4.5h stopped reaction.
Get the mixed tune device that 492.35ml distilled water is placed in 1000ml volume, add 0.25g friction reducer emulsion (molecular weight of copolymer 750,000 successively, glycerol dimethacrylate: allyl group trimethyl ammonium chloride: acrylamide=0.5:0.5:1.5, effective constituent concentration 34.5%), stirring velocity 800r/min, stir 10s, add 1.5g cleanup additive (mass percent consists of: 1% fluorocarbon surfactant FC-1010+0.8% butyl glycol ether+3.8% octanol+10% peregal o-20+84.4% distilled water) again, 0.4g sterilant (mixture of 75% glutaraldehyde+25% dazomet), 1.5g expansion-resisting agent (mass percent consists of: 75% tetramethyl ammonium chloride+25% ammonium chloride), finally add 4g ethyl acetate fiber (staple length: 9mm, degradation temperature 120 DEG C), initial 10s stirring velocity 1500r/min, then slowly comparatively 800r/min is low to moderate, stirring 20s mixes to make to fall and blocks water.
Test result: falling the kinematic viscosity that blocks water is 2.5mm
2/ s, falls the resistance-reducing yield 75% (normal temperature, caliber 8mm, linear velocity 10m/s) blocked water, falls the static sand setting speed 0.18mm/s that blocks water, recovery of core permeability 99.5%.
Above-mentioned falling blocked water after the application and construction of national shale gas demonstration area, Changning-Weiyuan, to returning discharge opeing, (kinematic viscosity is 0.81mm
2/ s, returns discharge opeing salinity 4.5 × 10
5mg/L) process.Return discharge opeing in equalizing tank, add pH adjusting agent sodium hydroxide (1%), citric acid (1%), sterilant glutaraldehyde (0.05%), dazomet (0.05%) carry out initial stage process to returning discharge opeing; Then entering retort utilizes sodium carbonate to remove the high valent cationic (calcium, magnesium etc.) returned in discharge opeing, then gathers propionic acid amide flocculation agent with negatively charged ion and makes throw out and suspended solids is agglomerating, rapid subsidence, refilter removal suspended solids.With returning the water that discharge opeing replaces in formula after process, being mixed with to fall by original formulation and blocking water, resistance-reducing yield 74% (normal temperature, caliber 8mm, linear velocity 10m/s).
(embodiment 3)
To participate in the raw material total mass of inverse emulsion polymerization for benchmark, by following concrete steps synthesis friction reducer emulsion:
1) preparation of aqueous phase: 40.17g glycerol dimethacrylate, 73.11g MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, 37.53g acrylamide are dissolved in distilled water, and add 0.15gEDTA disodium, add 0.53g initiator V50 before emulsification, be uniformly dissolved.
2) preparation of oil phase: take mass ratio 20% white oil 64g and emulsifying agent Span-80 (4%, 12.8g), span85 (1%, 3.2g).
3) emulsification: circulation oil phase, under logical smart nitrogen condition, drip aqueous phase, stirring velocity 2000r/min during dropping, time for adding is 65-75min, stirs 30min again after dropwising.
4) react: control heat-up rate, be warmed up to 63 ~ 65 DEG C, reaction 4.5h stopped reaction.
Get the mixed tune device that 488.5ml distilled water is placed in 1000ml volume, add 1.5g friction reducer emulsion (molecular weight of copolymer 600,000 successively, glycerol dimethacrylate: MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride: acrylamide=0.5:1:1.5, effective constituent concentration 34.5%), stirring velocity 800r/min, stir 10s, add 2.5g cleanup additive (mass percent consists of: 1% fluorocarbon surfactant FC-1010+0.8% butyl glycol ether+3.8% octanol+10% peregal o-20+84.4% distilled water) again, 0.5g sterilant (mass percent consists of: the mixture of 75% glutaraldehyde+25% dazomet), 2.0g expansion-resisting agent (75% tetramethyl ammonium chloride+25% ammonium chloride), finally add 5.0g ethyl acetate fiber (staple length: 9mm, degradation temperature 120 DEG C), initial 10s stirring velocity 1500r/min, then slowly comparatively 800r/min is low to moderate, stirring 20s mixes to make to fall and blocks water.
Test result: falling the kinematic viscosity that blocks water is 2.3mm
2/ s, falls the resistance-reducing yield 77.5% (normal temperature, caliber 8mm, linear velocity 10m/s) blocked water, falls the static sand setting speed 0.15mm/s that blocks water, recovery of core permeability 99.5%.
Above-mentioned falling blocked water after the application and construction of national shale gas demonstration area, Changning-Weiyuan, to returning discharge opeing, (kinematic viscosity is 0.78mm
2/ s, returns discharge opeing salinity 9.5 × 10
5mg/L) process.Return discharge opeing in equalizing tank, add pH adjusting agent sodium hydroxide (1%), citric acid (1%), sterilant dazomet (1%) carries out initial stage process to returning discharge opeing; Then entering retort utilizes sodium carbonate to remove the high valent cationic (calcium, magnesium etc.) returned in discharge opeing, then gathers propionic acid amide flocculation agent with negatively charged ion and makes throw out and suspended solids is agglomerating, rapid subsidence, refilter removal suspended solids.With returning the water that discharge opeing replaces in formula after process, being mixed with to fall by original formulation and blocking water, resistance-reducing yield 77.3% (normal temperature, caliber 8mm, linear velocity 10m/s).
(embodiment 4)
(on-the-spot formation water salinity is: 20 × 10 to get the on-the-spot local water of 490.25ml
5mg/L) the mixed tune device of 1000ml volume is placed in, add 2.5g friction reducer emulsion (embodiment 3 gained friction reducer emulsion) successively, stirring velocity 800r/min, stir 10s, add cleanup additive 1.5g (mass percent consists of: 1% fluorocarbon surfactant FC-1010+0.8% butyl glycol ether+3.8% octanol+10% peregal o-20+84.4% distilled water) again, 0.25g sterilant (mass percent consists of: the mixture of 75% glutaraldehyde+25% dazomet), 1.5g expansion-resisting agent (75% tetramethyl ammonium chloride+25% ammonium chloride), finally add 4.0g ethyl acetate fiber (staple length: 9mm, degradation temperature 120 DEG C), initial 10s stirring velocity 1500r/min, then slowly comparatively 800r/min is low to moderate, stirring 20s mixes to make to fall and blocks water.
Test result: falling the kinematic viscosity that blocks water is 2.5mm
2/ s, measures and falls the resistance-reducing yield 77.8% (normal temperature, caliber 8mm, linear velocity 10m/s) blocked water, recovery of core permeability 99.8%.
Claims (11)
1. a friction reducer, it is characterized in that, by acrylamide, esters monomer A and cationic monomer B by (1 ~ 4): 0.5:(0.5 ~ 1) mol ratio obtain through inverse emulsion polymerization random copolymerization, wherein said esters monomer A is the carboxylate of methacrylic acid and/or vinylformic acid and glycerol, and structural formula is
Wherein, R1, R2 are H or-CH
3;
Described cationic monomer B is allyl group trimethyl ammonium chloride or MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and the viscosity-average molecular weight of gained multipolymer is 5 × 10
5~ 8 × 10
5.
2. friction reducer as claimed in claim 1, it is characterized in that, the temperature of reaction of described inverse emulsion polymerization is 63 ~ 65 DEG C, and the reaction times is 4 ~ 5h, and initiator is azo diisobutyl amidine hydrochloride.
3. one kind is fallen and blocks water, and this falls the friction reducer blocking water and comprise described in claim 1 or 2.
4. fall as claimed in claim 3 and block water, it is characterized in that, its composition comprises by weight percentage
Friction reducer emulsion 0.02% ~ 0.08%
Transporting agent 0.5% ~ 1%
Wherein, described friction reducer emulsion comprises the friction reducer described in claim 1 or 2, and effective constituent concentration is 25% ~ 40%, and described transporting agent is acid fiber by polylactic and/or ester fibrid, the staple length of described acid fiber by polylactic is 5-12mm, and the degradation temperature of described acid fiber by polylactic is 70-120 DEG C; The staple length of described ester fibrid is 5-12mm, and the degradation temperature of described ester fibrid is 70-120 DEG C.
5. friction reducer as claimed in claim 4, it is characterized in that, described ester fibrid is at least one in ethyl lactate fiber, ethyl acetate fiber, methyl acetate fiber.
6. falling as described in claim 4 or 5 blocks water, and it is characterized in that, its composition is by weight percentage
Surplus is water.
7. fall as claimed in claim 6 and block water, it is characterized in that, the mass percent of described cleanup additive consists of:
Surplus is water.
8. fall as claimed in claim 6 and block water, it is characterized in that, described expansion-resisting agent is quaternary ammonium salt expansion-resisting agent.
9. fall as claimed in claim 8 and block water, it is characterized in that, described expansion-resisting agent is ammonium chloride and/or tetramethyl ammonium chloride.
10. fall as claimed in claim 6 and block water, it is characterized in that, described sterilant is glutaraldehyde and/or dazomet.
Fall the application blocked water in unconventional gas well volume fracturing construction according to any one of 11. claim 3-10, described unconventional gas well refers to that rate of permeation is less than the gas well of 0.1mD.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106876002A (en) * | 2017-03-03 | 2017-06-20 | 北京兴天通电讯科技有限公司 | It is a kind of from conductivity type macromolecular scaffold friction reducer and its production method |
| CN107057675A (en) * | 2017-05-19 | 2017-08-18 | 中国石油集团川庆钻探工程有限公司 | Suitable for the high salt tolerant reversed-phase emulsion friction reducer of shale reservoir fracturing reform |
| CN109135712A (en) * | 2018-08-01 | 2019-01-04 | 四川省威沃敦化工有限公司 | A kind of shale gas fracturing fluid instant water-in-water emulsion friction reducer and preparation method thereof |
| CN112503064A (en) * | 2020-12-09 | 2021-03-16 | 鞍钢集团矿业有限公司 | Drag reducer for ore pulp pipeline transportation and preparation method and application thereof |
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| US6187839B1 (en) * | 1999-03-03 | 2001-02-13 | Halliburton Energy Services, Inc. | Methods of sealing compositions and methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876002A (en) * | 2017-03-03 | 2017-06-20 | 北京兴天通电讯科技有限公司 | It is a kind of from conductivity type macromolecular scaffold friction reducer and its production method |
| CN106876002B (en) * | 2017-03-03 | 2019-04-05 | 北京兴天通电讯科技有限公司 | A kind of self-conductive type macromolecular scaffold friction reducer and its production method |
| CN107057675A (en) * | 2017-05-19 | 2017-08-18 | 中国石油集团川庆钻探工程有限公司 | Suitable for the high salt tolerant reversed-phase emulsion friction reducer of shale reservoir fracturing reform |
| CN109135712A (en) * | 2018-08-01 | 2019-01-04 | 四川省威沃敦化工有限公司 | A kind of shale gas fracturing fluid instant water-in-water emulsion friction reducer and preparation method thereof |
| CN112503064A (en) * | 2020-12-09 | 2021-03-16 | 鞍钢集团矿业有限公司 | Drag reducer for ore pulp pipeline transportation and preparation method and application thereof |
| CN112503064B (en) * | 2020-12-09 | 2022-06-14 | 鞍钢集团矿业有限公司 | Drag reducer for ore pulp pipeline transportation and preparation method and application thereof |
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| CN105399895B (en) | 2017-06-06 |
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