CN111234799A - Carbon dioxide foam fracturing fluid with high sand carrying performance and preparation method thereof - Google Patents
Carbon dioxide foam fracturing fluid with high sand carrying performance and preparation method thereof Download PDFInfo
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- CN111234799A CN111234799A CN202010149558.1A CN202010149558A CN111234799A CN 111234799 A CN111234799 A CN 111234799A CN 202010149558 A CN202010149558 A CN 202010149558A CN 111234799 A CN111234799 A CN 111234799A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 90
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 90
- 239000012530 fluid Substances 0.000 title claims abstract description 73
- 239000006260 foam Substances 0.000 title claims abstract description 65
- 239000004576 sand Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 239000002086 nanomaterial Substances 0.000 claims abstract description 34
- 229920000867 polyelectrolyte Polymers 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000002562 thickening agent Substances 0.000 claims abstract description 20
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 19
- 239000004088 foaming agent Substances 0.000 claims abstract description 19
- 239000011780 sodium chloride Substances 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 73
- 238000003756 stirring Methods 0.000 claims description 26
- 229920002873 Polyethylenimine Polymers 0.000 claims description 21
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims description 20
- 238000003860 storage Methods 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 16
- 239000002105 nanoparticle Substances 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 12
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims description 11
- 239000003999 initiator Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims description 10
- 229940001584 sodium metabisulfite Drugs 0.000 claims description 10
- 235000010262 sodium metabisulphite Nutrition 0.000 claims description 10
- 229940006186 sodium polystyrene sulfonate Drugs 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 229920002907 Guar gum Polymers 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- 239000000665 guar gum Substances 0.000 claims description 6
- 229960002154 guar gum Drugs 0.000 claims description 6
- 235000010417 guar gum Nutrition 0.000 claims description 6
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 6
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- RSYUFYQTACJFML-DZGCQCFKSA-N afzelechin Chemical compound C1([C@H]2OC3=CC(O)=CC(O)=C3C[C@@H]2O)=CC=C(O)C=C1 RSYUFYQTACJFML-DZGCQCFKSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000012267 brine Substances 0.000 claims description 3
- -1 carboxymethyl hydroxypropyl Chemical group 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 7
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 abstract description 4
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 18
- 239000000047 product Substances 0.000 description 9
- 239000004568 cement Substances 0.000 description 3
- 238000005429 filling process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003079 shale oil Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- MBEVSMZJMIQVBG-UHFFFAOYSA-N 2-(hydroxymethyl)guanidine Chemical compound NC(N)=NCO MBEVSMZJMIQVBG-UHFFFAOYSA-N 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229960002796 polystyrene sulfonate Drugs 0.000 description 2
- 239000011970 polystyrene sulfonate Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/70—Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
- C09K8/703—Foams
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/665—Compositions based on water or polar solvents containing inorganic compounds
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Organic Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention provides a carbon dioxide foam fracturing fluid with high sand carrying performance and a preparation method thereof, wherein the carbon dioxide foam fracturing fluid comprises the following components in percentage by mass: 0.3-0.5% of thickening agent, 0.25-0.4% of polyelectrolyte composite nano material, 0.1-0.5% of cross-linking agent, 0.03-0.05% of foaming agent, 10-30% of saline water and the balance of liquid carbon dioxide. According to the invention, on the basis of the original guanidine gum fracturing fluid system, the polyelectrolyte composite nano material is added, so that the stability of foam is greatly improved, the service life is prolonged by more than 1 time, the fluid filtration rate is greatly reduced, the fracturing fluid fracture-making capability is improved, the fracturing fluid sand suspension and sand carrying performance is improved, and the fracturing yield-increasing effect is improved.
Description
Technical Field
The invention belongs to the technical field of oil and gas well production increase, and particularly relates to a carbon dioxide foam fracturing fluid with high sand carrying performance and a preparation method thereof.
Background
At present, unconventional oil and gas resources such as shale gas, tight sandstone gas, shale oil, tight oil and the like play an important role in the global energy structure, but the physical properties of reservoirs of the type are generally poor, and the reservoirs have the physical properties such as low porosity, low permeability, low pore throat radius and the like, and the flow resistance of oil and gas is much larger than that of conventional oil and gas reservoirs. The hydraulic fracturing technology is applied to exploitation of unconventional oil and gas reservoirs such as shale gas and dense gas, a series of problems such as water sensitivity and reservoir pollution can be caused, and the shortage of water resources is an important factor for restricting hydraulic fracturing.
The carbon dioxide foam fracturing has the characteristics of low filtration loss coefficient and small filtration loss. In addition, due to the unique structure of the foam in the system, the system can still make the sedimentation speed of the sand very small by depending on the self capacity under the condition of high sand ratio, and has good sand suspending and carrying performances. Because the fracturing fluid has less liquid phase content and less filtration loss, relatively less fluid permeates into the stratum. In addition, the fracturing fluid has the characteristics of rapid flowback and the like, so that the contact time of the fluid and a production layer is short, and the hydration and the migration of clay minerals are avoided to the maximum extent. The oil-gas well plugging agent is successfully applied to oil-gas wells of a plurality of oil fields in China at present, and has good application effect on shale gas, compact sandstone gas, shale oil and compact oil.
At present, there are many carbon dioxide foam fracturing fluids, for example, the invention of the publication No. CN105567213A discloses a high temperature resistant clean CO suitable for the development of unconventional oil and gas reservoirs2The foam fracturing fluid comprises a gas phase of carbon dioxide and a liquid phase of high-temperature-resistant clean fracturing fluid, and the foam quality is 52-75%; the high-temperature resistant clean fracturing fluid is prepared from 0.3-0.65 wt% of a thickening agent, 0.2-0.5 wt% of a viscosity synergist, 0.2-0.3 wt% of a pH value regulator, 0-0.2 wt% of a high-temperature stabilizer, 0.01-0.1 wt% of a gel breaker and water; the thickening agent is prepared from acrylamide, vinyl pyrrolidone, maleic acid, an anionic functional monomer, an initiator, inorganic salt and the like; the viscosity synergist is mainly an anionic surfactant; the pH regulator is mainly an organic acid. The foam fracturing fluid system does not perform targeted measures on the stability of foam, so that the foam has short service life and poor stability, and the fracturing fluid system has poor sand carrying performance and is difficult to meet the process design requirements.
The carbon dioxide foam fracturing fluid with high sand-carrying performance disclosed by the invention is added with the polyelectrolyte composite nano material on the basis of the original guanidine gum fracturing fluid system, so that the foam service life and the stability are obviously improved, the fluid filtration rate is greatly reduced, the fracturing fluid fracture-making capacity is improved, the sand-suspending and carrying performance of the fracturing fluid is improved, and the fracturing yield-increasing effect is greatly improved.
Disclosure of Invention
Aiming at the defects that the stability of foam is not pertinently measured by the existing carbon dioxide foam fracturing fluid system, the foam service life is short, the stability is poor, the sand carrying performance of the fracturing fluid system is poor and the like, the invention provides the carbon dioxide foam fracturing fluid with long foam service life and good stability and high sand carrying performance, and discloses the preparation method thereof, so that the fluid filtration rate is greatly reduced, the fracturing fluid fracture making capacity is improved, the sand suspension and carrying performance of the fracturing fluid are improved, and the fracturing yield-increasing effect is improved.
The technical scheme adopted by the invention is as follows:
a carbon dioxide foam fracturing fluid with high sand carrying performance is composed of the following components in percentage by mass: 0.3-0.5% of thickening agent, 0.25-0.4% of polyelectrolyte composite nano material, 0.1-0.5% of cross-linking agent, 0.03-0.05% of foaming agent, 10-30% of saline water and the balance of liquid carbon dioxide.
Further, the polyelectrolyte composite nano-material is prepared from the following raw materials in percentage by mass: 25-35% of polyethyleneimine, 20-30% of sodium polystyrene sulfonate, 15-20% of silica nanoparticles, 0.1-0.2% of initiator and the balance of deionized water.
Preferably, the initiator is formed by mixing tert-butyl hydroperoxide and sodium metabisulfite according to the weight percentage of 1 (1.5-3.0).
Preferably, the silica nanoparticles have a particle size of 100-180 nm.
Further, the preparation method of the polyelectrolyte composite nanomaterial comprises the following steps:
a, adding a formula amount of polyethyleneimine and deionized water into a reaction kettle to obtain a polyethyleneimine water solution;
b, adding sodium polystyrene sulfonate and silica nanoparticles in a formula amount into the polyethyleneimine aqueous solution, and stirring for 3-5 minutes to obtain a mixed solution;
c, respectively adding tert-butyl hydroperoxide and sodium metabisulfite with the formula ratio into the mixed solution, stirring for 10-15 minutes, heating to 40-60 ℃ under the protection of nitrogen, and standing for 5-8 hours to obtain a colloidal product;
and d, granulating, drying and crushing the colloidal product to obtain the polyelectrolyte composite nanomaterial.
Further, the thickening agent is one or more of hydroxypropyl guar gum, hydroxymethyl guar gum or carboxymethyl hydroxypropyl guar gum.
Further, the cross-linking agent is one or more of zirconium oxychloride, titanium tetrachloride, chromium potassium sulfate, potassium dichromate and titanium tetrachloride.
Further, the blowing agent is a nonionic alcohol blowing agent.
Preferably, the mass concentration of NaCl in the brine is 1% -4%.
A preparation method of carbon dioxide foam fracturing fluid with high sand carrying performance comprises the following steps:
s1, slowly adding the thickening agent with the formula amount into the saline water with the formula amount under the stirring condition, and stirring for 15-30min to completely dissolve the thickening agent;
s2, adding the polyelectrolyte composite nano-material with the formula amount into the dissolved thickening agent, stirring uniformly, and injecting into a carbon dioxide storage tank;
s3, adding a foaming agent with a formula amount into a carbon dioxide storage tank, and injecting liquid carbon dioxide with a formula amount into the carbon dioxide storage tank by using a carbon dioxide filling machine to prepare carbon dioxide foam base liquid;
and S4, adding a cross-linking agent in a formula amount into the carbon dioxide foam base solution obtained in the step S3 according to the construction sand ratio to obtain the carbon dioxide foam fracturing fluid with high sand carrying performance.
According to the invention, by innovatively adding the polyelectrolyte composite nanomaterial and optimizing the fracturing fluid preparation process, the sand carrying effect of the fracturing fluid is greatly improved, and the fracturing fluid has the following specific beneficial effects:
the invention has the following beneficial effects:
1. the apparent viscosity of the carbon dioxide foam fracturing fluid with high sand carrying performance is increased along with the increase of the using concentration (0.3-0.5%) of the thickening agent, and can reach higher apparent viscosity under the condition of less using amount of the thickening agent, and the viscosity is not lower than 200mPa.s (shown in figure 1) after a shearing experiment;
2. the fracturing fluid prepared by the invention is easy to degrade and break gel, the content of residues is lower than 0.5%, and the comprehensive damage rate of a rock core is lower than 4%;
3. the carbon dioxide foam fracturing fluid with high sand carrying performance disclosed by the invention has the advantages that the polyelectrolyte composite nano material is added on the basis of the original guanidine gum fracturing fluid system, so that the stability of foam is greatly improved, the service life is prolonged by more than 1 time, the instantaneous maximum sand ratio of the fracturing fluid can reach 55%, and the average sand ratio of fracturing is higher than 30%.
4. The carbon dioxide foam fracturing fluid has the advantages of stable foam performance, strong sand carrying performance, strong temperature resistance and shearing resistance, wide application temperature range, low residue content, good flowback performance and the like, has little damage to a reservoir and obviously improves the transformation effect of a water-locking water-sensitive reservoir and a compact reservoir.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Figure 1 is a viscosity temperature test curve for a carbon dioxide foam fracturing fluid.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
The invention relates to a carbon dioxide foam fracturing fluid with high sand carrying performance, which consists of the following components in percentage by mass: 0.3-0.5% of thickening agent, 0.25-0.4% of polyelectrolyte composite nano material, 0.1-0.5% of cross-linking agent, 0.03-0.05% of foaming agent, 10-30% of saline water and the balance of liquid carbon dioxide.
Further, the polyelectrolyte composite nano-material is prepared from the following raw materials in percentage by mass: 25-35% of polyethyleneimine, 20-30% of sodium polystyrene sulfonate, 15-20% of silica nanoparticles, 0.1-0.2% of initiator and the balance of deionized water.
Preferably, the initiator is formed by mixing tert-butyl hydroperoxide and sodium metabisulfite according to the weight percentage of 1 (1.5-3.0).
Further, the preparation method of the polyelectrolyte composite nanomaterial comprises the following steps:
a, adding a formula amount of polyethyleneimine and deionized water into a reaction kettle to obtain a polyethyleneimine water solution;
b, adding sodium polystyrene sulfonate and silica nanoparticles in a formula amount into the polyethyleneimine aqueous solution, and stirring for 3-5 minutes to obtain a mixed solution;
c, respectively adding tert-butyl hydroperoxide and sodium metabisulfite with the formula ratio into the mixed solution, stirring for 10-15 minutes, heating to 40-60 ℃ under the protection of nitrogen, and standing for 5-8 hours to obtain a colloidal product;
and d, granulating, drying and crushing the colloidal product to obtain the polyelectrolyte composite nanomaterial.
Preferably, the silica nanoparticles have a particle size of 100-180 nm.
Further, the thickening agent is one or more of hydroxypropyl guar gum, hydroxymethyl guar gum or carboxymethyl hydroxypropyl guar gum.
Further, the cross-linking agent is one or more of zirconium oxychloride, titanium tetrachloride, chromium potassium sulfate, potassium dichromate and titanium tetrachloride.
Further, the foaming agent is a nonionic alcohol foaming agent, such as an ethanol foaming agent, a propanol foaming agent, etc., produced by Wanhua chemical group company.
Preferably, the mass concentration of NaCl in the brine is 1% -4%.
A preparation method of carbon dioxide foam fracturing fluid with high sand carrying performance comprises the following steps:
s1, slowly adding the thickening agent with the formula amount into the saline water with the formula amount under the stirring condition, and stirring for 15-30min to completely dissolve the thickening agent;
s2, adding the polyelectrolyte composite nano-material with the formula amount into the dissolved thickening agent, stirring uniformly, and injecting into a carbon dioxide storage tank;
s3, adding a foaming agent with a formula amount into a carbon dioxide storage tank, and injecting liquid carbon dioxide with a formula amount into the carbon dioxide storage tank by using a carbon dioxide filling machine (the pressure in the storage tank is adjusted in the filling process to ensure that the carbon dioxide is in a liquid state), so as to prepare carbon dioxide foam base liquid;
and S4, adding a cross-linking agent in a formula amount into the carbon dioxide foam base solution obtained in the step S3 according to the construction sand ratio (the sand ratio is in positive correlation with the addition amount of the cross-linking agent), and thus obtaining the carbon dioxide foam fracturing fluid with high sand carrying performance.
TABLE 1 comparison table of performance parameters of different fracturing fluid systems
Example 1
The embodiment relates to a carbon dioxide foam fracturing fluid with high sand carrying performance, which consists of the following components in percentage by mass: 0.4% of hydroxypropyl guar gum, 0.3% of polyelectrolyte composite nano material, 0.3% of zirconium oxychloride, 0.04% of nonionic alcohol foaming agent, 20% of saline with the mass concentration of 2%, and the balance of liquid carbon dioxide.
Further, the polyelectrolyte composite nano-material is prepared from the following raw materials in percentage by mass: 30.0% of polyethyleneimine, 25.0% of sodium polystyrene sulfonate, 18.0% of silica dioxide nanoparticles, 0.2% of initiator and the balance of deionized water. Further, the initiator consists of tert-butyl hydroperoxide and sodium metabisulfite, and the weight percentage of the tert-butyl hydroperoxide and the sodium metabisulfite is 1: 1.5.
Further, the preparation method of the polyelectrolyte composite nanomaterial comprises the following steps:
a, adding a formula amount of Polyethyleneimine (PEI) and deionized water into a reaction kettle to obtain a polyethyleneimine water solution;
b, adding sodium polystyrene sulfonate (PSS) and silica nanoparticles (the particle size of the silica nanoparticles is 140 nanometers) in a formula amount into the polyethyleneimine water solution, and stirring for 5 minutes to obtain a mixed solution;
c, respectively adding tert-butyl hydroperoxide and sodium metabisulfite with the formula ratio into the mixed solution, stirring for 15 minutes, heating to 55 ℃ under the protection of nitrogen, and standing for 6 hours to obtain a colloidal product;
and d, granulating, drying and crushing the colloidal product to obtain the polyelectrolyte composite nano-material powder.
The preparation method of the carbon dioxide foam fracturing fluid with high sand carrying performance comprises the following steps:
s1, slowly adding hydroxypropyl guar gum in the formula amount into saline water in the formula amount under the stirring condition, and stirring for 15-30min to completely dissolve the hydroxypropyl guar gum;
s2, continuously adding the polyelectrolyte composite nano material with the formula amount, uniformly stirring, and injecting into a carbon dioxide storage tank;
s3, adding a foaming agent with a formula amount into a carbon dioxide storage tank, and injecting liquid carbon dioxide with a formula amount into the carbon dioxide storage tank by using a carbon dioxide filling machine (the carbon dioxide is ensured to be in a liquid state by adjusting the pressure in the storage tank in the filling process), so as to prepare carbon dioxide foam base liquid;
and S4, adding zirconium oxychloride in a formula amount into the carbon dioxide foam base solution obtained in the step S3 according to the construction sand ratio to obtain the carbon dioxide foam fracturing fluid with high sand carrying performance.
Example 2
The embodiment relates to a carbon dioxide foam fracturing fluid with high sand carrying performance, which consists of the following components in percentage by mass: 0.35% of hydroxymethyl guanidine gum, 0.35% of polyelectrolyte composite nano material, 0.4% of zirconium oxychloride, 0.03% of nonionic alcohol foaming agent, 25% of saline with the mass concentration of 2%, and the balance of liquid carbon dioxide.
Further, the polyelectrolyte composite nano-material is prepared from the following raw materials in percentage by mass: 30.0% of polyethyleneimine, 25.0% of sodium polystyrene sulfonate, 20.0% of silica dioxide nanoparticles, 0.2% of initiator and the balance of water.
Further, the preparation method of the polyelectrolyte composite nanomaterial comprises the following steps:
adding 200 ml of deionized water into a reaction kettle, then adding the polyethyleneimine with the formula amount, and stirring to obtain a polyethyleneimine water solution;
b, adding sodium polystyrene sulfonate (PSS) and silica nanoparticles (the particle size of the silica nanoparticles is 180 nanometers) in a formula amount into the polyethyleneimine water solution, and stirring for 5 minutes to obtain a mixed solution;
c, respectively adding tert-butyl hydroperoxide (namely 0.15 g of tert-butyl hydroperoxide) and sodium metabisulfite (namely 0.35 g of sodium metabisulfite) into the mixed solution according to the formula ratio, stirring for 20 minutes, heating to 50 ℃ under the nitrogen protection atmosphere, and standing for 7 hours to obtain a colloidal product;
and d, granulating, drying and crushing the colloidal product to obtain the polyelectrolyte composite nano-material powder.
A preparation method of carbon dioxide foam fracturing fluid with high sand carrying performance comprises the following steps:
s1, preparing 200 milliliters of saline with the mass concentration of 2%;
s2, slowly adding the hydroxymethyl guar gum (namely 4 g of hydroxypropyl guar gum) into the saline water with the formula amount under the stirring condition, and stirring for 15-30min to completely dissolve the hydroxymethyl guar gum;
s3, preparing a polyelectrolyte composite nano material, adding the polyelectrolyte composite nano material with the formula amount into the completely dissolved hydroxymethyl guanidine gum, uniformly stirring, and injecting into a carbon dioxide storage tank;
s3, adding a foaming agent with a formula amount into a carbon dioxide storage tank, and injecting liquid carbon dioxide with a formula amount into the carbon dioxide storage tank by using a carbon dioxide filling machine (the carbon dioxide is ensured to be in a liquid state by adjusting the pressure in the storage tank in the filling process), so as to prepare carbon dioxide foam base liquid;
and S4, adding zirconium oxychloride in a formula amount into the carbon dioxide foam base obtained in the step S3 according to the construction sand ratio to obtain the carbon dioxide foam fracturing fluid with high sand carrying performance.
Example 3
(1) Performing on-site fracturing construction, and configuring 100 parts of saline water with the mass concentration of 2% by using a water tank;
(2) sucking 2000 kg of hydroxypropyl guar gum into a water tank by using a material sucking funnel, and circulating for 30min by using a cement truck to completely dissolve the guar gum;
(3) sucking 1800 kg of polyelectrolyte composite nano material into a water tank by using a material sucking funnel, and circulating for 20min by using a cement truck to completely dissolve the polyelectrolyte composite nano material;
(4) using a foaming agent with the formula amount of a cement handlebar to suck the foaming agent into a water tank, and circulating for 5 minutes to prepare carbon dioxide foam base liquid;
(5) preparing 2 parts of zirconium oxychloride solution by using a square tank, wherein the effective concentration is 20%, and preparing a cross-linking agent;
(6) preparing a carbon dioxide tank car 20, and filling liquid carbon dioxide into the tank car to 400 degrees;
(7) the water tank, the square tank and the carbon dioxide tank car are connected in parallel by using a sand mixer truck, and the base fluid, the cross-linking agent and the liquid carbon dioxide are injected into the stratum.
Performance test experiments:
according to the standard of SY/T5107-2005 water-based fracturing fluid performance test method, an RS6000 rheometer is used for carrying out temperature resistance and shear resistance tests on the high sand-carrying performance carbon dioxide foam fracturing fluid at 60 ℃, and the test results are shown in figure 1.
Specifically, the carbon dioxide foam fracturing fluid can be selectively added with a gel breaker during the use process, and the type and the amount of the gel breaker depend on the type of an oil reservoir.
In conclusion, the invention is suitable for water-lock water-sensitive reservoirs and unconventional oil and gas resource reservoirs such as shale gas, tight sandstone gas, shale oil and tight oil.
The carbon dioxide foam fracturing fluid is added with the polyelectrolyte composite nano material on the basis of the original guanidine gum fracturing fluid system, so that the foam service life and the stability are obviously improved, the fluid filtration rate is greatly reduced, the fracturing fluid joint making capacity is improved, the sand suspending and carrying performance of the fracturing fluid is improved, and the fracturing yield-increasing effect is greatly improved.
The methods and structures described in the above embodiments are not part of the common general knowledge in the industry and need not be described in detail herein. Related materials or finished products are sold in the market.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. The carbon dioxide foam fracturing fluid with high sand carrying performance is characterized by comprising the following components in percentage by mass: 0.3-0.5% of thickening agent, 0.25-0.4% of polyelectrolyte composite nano material, 0.1-0.5% of cross-linking agent, 0.03-0.05% of foaming agent, 10-30% of saline water and the balance of liquid carbon dioxide.
2. The carbon dioxide foam fracturing fluid with high sand carrying capacity according to claim 1, wherein the polyelectrolyte composite nano material is prepared from the following raw materials in percentage by mass: 25-35% of polyethyleneimine, 20-30% of sodium polystyrene sulfonate, 15-20% of silica nanoparticles, 0.1-0.2% of initiator and the balance of deionized water.
3. The carbon dioxide foam fracturing fluid with high sand carrying capacity of claim 2, which is characterized in that: the initiator is prepared by mixing tert-butyl hydroperoxide and sodium metabisulfite according to the weight percentage of 1 (1.5-3.0).
4. The carbon dioxide foam fracturing fluid with high sand carrying capacity of claim 2, which is characterized in that: the particle size of the silica nano-particles is 100-180 nm.
5. The carbon dioxide foam fracturing fluid with high sand carrying capacity according to claim 2, wherein the preparation method of the polyelectrolyte composite nano material comprises the following steps:
a, adding a formula amount of polyethyleneimine and deionized water into a reaction kettle to obtain a polyethyleneimine water solution;
b, adding sodium polystyrene sulfonate and silica nanoparticles in a formula amount into the polyethyleneimine aqueous solution, and stirring for 3-5 minutes to obtain a mixed solution;
c, respectively adding initiators with the formula amount into the mixed solution, stirring for 10-15 minutes, heating to 40-60 ℃ under the nitrogen protection atmosphere, and standing for 5-8 hours to obtain a colloidal product;
and d, granulating, drying and crushing the colloidal product to obtain the polyelectrolyte composite nanomaterial.
6. The carbon dioxide foam fracturing fluid with high sand carrying capacity of claim 1, which is characterized in that: the thickening agent is one or more of hydroxypropyl guar gum, hydroxymethyl guar gum or carboxymethyl hydroxypropyl guar gum.
7. The carbon dioxide foam fracturing fluid with high sand carrying capacity of claim 1, which is characterized in that: the cross-linking agent is one or more of zirconium oxychloride, titanium tetrachloride, chromium potassium sulfate, potassium dichromate and titanium tetrachloride.
8. The carbon dioxide foam fracturing fluid with high sand carrying capacity of claim 1, which is characterized in that: the foaming agent is a nonionic alcohol foaming agent.
9. The carbon dioxide foam fracturing fluid with high sand carrying capacity of claim 1, which is characterized in that: the mass concentration of NaCl in the brine is 1-4%.
10. A method for preparing a sand-carrying carbon dioxide foam fracturing fluid according to any one of claims 1 to 9, comprising the following steps:
s1, slowly adding the thickening agent with the formula amount into the saline water with the formula amount under the stirring condition, and stirring for 15-30min to completely dissolve the thickening agent;
s2, adding the polyelectrolyte composite nano-material with the formula amount into the dissolved thickening agent, stirring uniformly, and injecting into a carbon dioxide storage tank;
s3, adding a foaming agent with a formula amount into a carbon dioxide storage tank, and injecting liquid carbon dioxide with a formula amount into the carbon dioxide storage tank by using a carbon dioxide filling machine to prepare carbon dioxide foam base liquid;
and S4, adding a cross-linking agent in a formula amount into the carbon dioxide foam base solution obtained in the step S3 according to the construction sand ratio to obtain the carbon dioxide foam fracturing fluid with high sand carrying performance.
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