CN116218494B - Composite auxiliary agent, deep profile control crosslinking agent, preparation method and application thereof - Google Patents
Composite auxiliary agent, deep profile control crosslinking agent, preparation method and application thereof Download PDFInfo
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- CN116218494B CN116218494B CN202111482521.1A CN202111482521A CN116218494B CN 116218494 B CN116218494 B CN 116218494B CN 202111482521 A CN202111482521 A CN 202111482521A CN 116218494 B CN116218494 B CN 116218494B
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- 239000003431 cross linking reagent Substances 0.000 title claims abstract description 122
- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 68
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 52
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims abstract description 26
- 235000002906 tartaric acid Nutrition 0.000 claims abstract description 26
- 239000011975 tartaric acid Substances 0.000 claims abstract description 26
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 claims abstract description 24
- 229910001863 barium hydroxide Inorganic materials 0.000 claims abstract description 24
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 claims abstract description 23
- 229920001732 Lignosulfonate Polymers 0.000 claims abstract description 23
- 229940050410 gluconate Drugs 0.000 claims abstract description 23
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims abstract description 22
- 239000004202 carbamide Substances 0.000 claims abstract description 22
- 239000001632 sodium acetate Substances 0.000 claims abstract description 22
- 235000017281 sodium acetate Nutrition 0.000 claims abstract description 22
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 21
- 239000004971 Cross linker Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 23
- 239000003921 oil Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 20
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 14
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 11
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 10
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 claims description 10
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 8
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 8
- 229920002866 paraformaldehyde Polymers 0.000 claims description 8
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 239000000295 fuel oil Substances 0.000 claims description 3
- 230000005465 channeling Effects 0.000 abstract description 7
- 230000035484 reaction time Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 5
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000000499 gel Substances 0.000 description 44
- 230000000694 effects Effects 0.000 description 23
- 229920002401 polyacrylamide Polymers 0.000 description 20
- 230000035699 permeability Effects 0.000 description 11
- 238000010276 construction Methods 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 238000011049 filling Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 6
- 230000002411 adverse Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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Classifications
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Medicinal Preparation (AREA)
Abstract
The invention particularly relates to a composite additive, a deep profile control cross-linking agent, a preparation method and application thereof, belonging to the technical field of petroleum exploitation, wherein the cross-linking agent comprises the following components in mass percent: 0.06% -0.1% of a first cross-linking agent body; 0.005% -0.012% of a second crosslinker body; dimethyl sulfoxide 0.01% -0.03%; carbonate 0.008% -0.012%; tartaric acid 0.02% -0.05%; 0.03% -0.05% of lignosulfonate and/or gluconate; sodium acetate and/or urea 0.01% -0.03%; barium hydroxide 0.008-0.01%; thiourea 0.01% -0.02%; the balance being water; by introducing the composite auxiliary agent, the reaction time can be controlled, the deep profile control and channeling sealing are facilitated, more effective products are obtained, and the dosage of the medicament is reduced. Meanwhile, the water solubility of the product can be improved, and the performance stability of the product can be prolonged.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a composite additive, a deep profile control crosslinking agent, a preparation method and application thereof.
Background
The cross-linking agent is one of the chemical agents commonly used for improving the recovery ratio of the oil field, can be acted with polyacrylamide polymers to generate gels with different forms, and is applied to profile control, water shutoff and displacement technologies of the oil field. The polyacrylamide crosslinking agent commonly used at present mainly comprises high-valence metal ions and organic synthesis. As a crosslinking agent for polyacrylamide, it is necessary to have good water solubility, high crosslinking activity and good storage stability. However, the existing cross-linking agent cannot be stored for a long time, and the popularization and application of the cross-linking agent in the oilfield site are directly affected.
The cross-linking agent prepared by the prior art has the technical problems of relatively large molecular mass and poor storage stability of the product, namely the cross-linking agent product must be produced before use, and insoluble matters are formed and the cross-linking activity is lost when the cross-linking agent product is placed for a long time. At present, the conventional crosslinking agent has high toxicity, strong pungent smell and high cost. Meanwhile, the gel formed by the reaction with the polymer is too fast, so that the deep profile control of the oil field is not facilitated when the polymer is applied to profile control and water shutoff of the oil field.
Disclosure of Invention
The invention aims to provide a composite additive, a deep profile control crosslinking agent, a preparation method and application thereof, and aims to solve the problem that the gel formation of the gel formed by the reaction of the conventional crosslinking agent and a polymer is too fast.
The embodiment of the invention provides a composite auxiliary agent, which comprises the following raw materials in mass:
dimethyl sulfoxide 0.01-0.03 weight portions;
carbonate 0.008-0.012 portions;
0.02-0.05 part of tartaric acid;
0.03-0.05 part of lignosulfonate and/or gluconate;
0.01-0.03 part of sodium acetate and/or urea;
0.008-0.01 part of barium hydroxide;
thiourea 0.01-0.02 parts.
Optionally, the carbonate comprises at least one of sodium carbonate and potassium carbonate.
Based on the same inventive concept, the embodiment of the invention also provides a deep profile control cross-linking agent, which comprises the following raw materials in mass:
0.06% -0.1% of a first cross-linking agent body;
0.005% -0.012% of a second crosslinker body;
dimethyl sulfoxide 0.01% -0.03%;
carbonate 0.008% -0.012%;
tartaric acid 0.02% -0.05%;
0.03% -0.05% of lignosulfonate and/or gluconate;
sodium acetate and/or urea 0.01% -0.03%;
barium hydroxide 0.008-0.01%;
thiourea 0.01% -0.02%;
the balance being water.
Optionally, the first crosslinker body comprises at least one of paraformaldehyde and urotropin.
Optionally, the second crosslinker body comprises at least one of resorcinol, phenol, catechol, and hydroquinone.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the depth profile control cross-linking agent, which comprises the following steps:
mixing a first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea into water to obtain a mixture;
and mixing the mixture, the second cross-linking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide to obtain the deep profile control cross-linking agent.
Optionally, the first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea are mixed in water to obtain a mixture, and the mixing stirring time is 20min-30min.
Optionally, the mixture, the second cross-linking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide are mixed to obtain the deep profile control cross-linking agent, wherein the mixing stirring time is 10min-20min.
Optionally, the first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea are mixed in water, and the adding sequence is that the first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea are added sequentially.
Optionally, the step of mixing the mixture, the second cross-linking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide to obtain the deep profile control cross-linking agent specifically includes:
and sequentially adding a second crosslinking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide into the mixture to obtain the deep profile control crosslinking agent.
Based on the same inventive concept, the embodiment of the invention also provides application of the depth profile control cross-linking agent, wherein the application comprises that the cross-linking agent is used for profile control and water shutoff of an oil reservoir.
Optionally, the reservoir comprises one of a thin oil reservoir, a high pour oil reservoir, or a normal heavy oil reservoir.
Optionally, the bottom layer temperature of the reservoir is below 120 ℃.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the deep profile control crosslinking agent provided by the embodiment of the invention comprises the following components in mass: 0.06% -0.1% of a first cross-linking agent body; 0.005% -0.012% of a second crosslinker body; dimethyl sulfoxide 0.01% -0.03%; carbonate 0.008% -0.012%; tartaric acid 0.02% -0.05%; 0.03% -0.05% of lignosulfonate and/or gluconate; sodium acetate and/or urea 0.01% -0.03%; barium hydroxide 0.008-0.01%; thiourea 0.01% -0.02%; the balance being water; by introducing the composite auxiliary agent and through the synergistic effect of the components and the proportion of the composite auxiliary agent, the purposes of delaying the gel forming time, improving the thermal stability and the anti-freezing capability are achieved, and finally, the gel with controllable gel forming time and adjustable plugging strength is formed, so that the deep profile control and channeling sealing of the stratum are realized. .
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method provided by an embodiment of the present invention.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
according to an exemplary embodiment of the present invention, there is provided a deep profile control crosslinking agent, the crosslinking agent including, by mass:
0.06% -0.1% of a first cross-linking agent body;
0.005% -0.012% of a second crosslinker body;
dimethyl sulfoxide 0.01% -0.03%;
carbonate 0.008% -0.012%;
tartaric acid 0.02% -0.05%;
0.03% -0.05% of lignosulfonate and/or gluconate;
sodium acetate and/or urea 0.01% -0.03%;
barium hydroxide 0.008-0.01%;
thiourea 0.01% -0.02%;
the balance being water.
The reason why the mass fraction of the first cross-linking agent body is controlled to be 0.06% -0.1% and the mass fraction of the second cross-linking agent body is controlled to be 0.005% -0.012% is that gel with adjustable gel forming time and different plugging strength can be formed by adopting the first cross-linking agent body and the second cross-linking agent body with different concentrations to react with polyacrylamide, if the concentration is too high, the embrittlement stability of the gel with excessive gel forming is poor, the effective period is short, and if the concentration is too low, the effect of long-term effective plugging is difficult to realize due to the low gel forming strength;
the dimethyl sulfoxide can improve the intersolubility of the first crosslinking agent body and the second crosslinking agent body, has good heat stability and anti-freezing performance, can improve the temperature resistance of gel, and can not be frozen in winter construction agents, so that the construction is ensured to be carried out smoothly, and the applicant finds in the invention process: the mass fraction of the dimethyl sulfoxide is controlled to be 0.01-0.03%, so that the solubility, the thermal stability and the anti-freezing capability of the component can be fully exerted;
the carbonate can improve the solubility of each component of the deep profile control cross-linking agent and ensure the long-term stability of the cross-linking agent performance;
tartaric acid can control the reaction time of the cross-linking agent and meet the requirements of different types of oil reservoirs on the gel forming time;
the lignosulfonate and/or gluconate can be cooperated with tartaric acid to control the reaction time of the cross-linking agent and polyacrylamide, so as to realize the requirements of different types of oil reservoirs on the gel forming time;
sodium acetate and/or urea can cooperate with dimethyl sulfoxide, so that the heat stability and the anti-freezing performance of the cross-linking agent can be improved, the construction agent can not be frozen in winter, and the smooth construction is ensured;
the barium hydroxide can be cooperated with tartaric acid, lignosulfonate and/or gluconate to control the reaction time of the cross-linking agent and polyacrylamide, so as to realize the requirements of different types of oil reservoirs on the gel forming time;
the thiourea can improve the thermal stability of the gel, keep the gel forming performance effective for a long time and prolong the measure effect.
The cross-linking agent is introduced with the composite auxiliary agent, so that the reaction time can be controlled, the deep profile control and channeling sealing are facilitated, more effective products are obtained, and the dosage of the medicament is reduced. Meanwhile, the water solubility of the product can be improved, and the performance stability of the product can be prolonged.
In some embodiments, the first crosslinker body comprises at least one of paraformaldehyde and urotropin.
In some embodiments, the second crosslinker body comprises at least one of resorcinol, phenol, catechol, and hydroquinone.
In some embodiments, the carbonate comprises at least one of sodium carbonate and potassium carbonate.
According to another exemplary embodiment of the present invention, there is provided a composite auxiliary agent including, by mass:
dimethyl sulfoxide 0.01-0.03 weight portions;
carbonate 0.008-0.012 portions;
0.02-0.05 part of tartaric acid;
0.03-0.05 part of lignosulfonate and/or gluconate;
0.01-0.03 part of sodium acetate and/or urea;
0.008-0.01 part of barium hydroxide;
thiourea 0.01-0.02 parts.
According to another exemplary embodiment of the present invention, there is provided a method for preparing a depth profile control cross-linking agent as described above, the method comprising:
s1, mixing a first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea into water to obtain a mixture;
specifically, adding paraformaldehyde and/or urotropine, dimethyl sulfoxide, sodium carbonate and/or potassium carbonate, sodium acetate and/or urea and thiourea into water, mixing, and stirring to obtain a mixture;
in some embodiments, the time of mixing and stirring in step S1 is preferably 20 to 30 minutes.
In order to realize the full dissolution of each component, ensure stable performance and control the stirring time to be 20-30 minutes, the adverse effect of the overlarge mixing time is that the stirring and shearing for a long time can reduce the effect of each component, the gelling performance is influenced, and the adverse effect of overlarge mixing time is that the dissolution cannot be uniformly realized, and the performance stability is influenced.
S2, mixing the mixture, a second cross-linking agent body, tartaric acid, lignin sulfonate and/or gluconate and barium hydroxide to obtain the deep profile control cross-linking agent.
Specifically, resorcinol and/or phenol and/or catechol and/or hydroquinone, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide are added into the mixture, and the deep profile control crosslinking agent is obtained by stirring.
The stirring time is controlled to be 10-20 minutes to realize the sufficient dissolution of each component and ensure the stable performance, and the adverse effect of the excessive mixing time is that the effect of each component can be reduced by long-time stirring and shearing, the gelling performance is influenced, and the adverse effect of the excessive mixing time is that the components cannot be uniformly dissolved, and the performance stability is influenced.
The applicant found that: the stability of the deep profile control cross-linking agent can be improved by controlling the addition sequence of the components, in the embodiment, step S1 sequentially adds paraformaldehyde and/or urotropine, dimethyl sulfoxide, sodium carbonate and/or potassium carbonate, sodium acetate and/or urea and thiourea; step S2, resorcinol and/or phenol and/or catechol and/or hydroquinone, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide are sequentially added into the mixture.
The deep profile control and flooding cross-linking agent provided by the embodiment of the application can be applied to profile control and water shutoff measures of oil reservoirs such as thin oil, high-freezing oil and common heavy oil, and specifically, the deep profile control and flooding cross-linking agent and a polymer react to generate a gel profile control and flooding agent with excellent performance, the gel profile control and flooding agent is injected into a stratum below 120 ℃, the long-term deep shutoff effect is achieved, and the production effect of a measure well is improved.
The composite auxiliary agent, the depth profile control cross-linking agent, the preparation method and the application thereof are described in detail below with reference to examples, comparative examples and experimental data.
Example 1
A deep profile control crosslinking agent, comprising, by mass: 0.08% of paraformaldehyde, 0.01% of resorcinol, 0.02% of dimethyl sulfoxide, 0.009% of sodium carbonate, 0.04% of tartaric acid, 0.035% of lignosulfonate, 0.02% of sodium acetate, 0.01% of barium hydroxide, 0.018% of thiourea and the balance of water.
The preparation method comprises the following steps:
s1, adding paraformaldehyde, dimethyl sulfoxide, sodium carbonate, sodium acetate and thiourea into water, mixing, and stirring for 30 minutes to obtain a mixture;
s2, adding resorcinol, tartaric acid, lignosulfonate and barium hydroxide into the mixture, and stirring for 20 minutes to obtain the deep profile control crosslinking agent.
Example 2
A deep profile control crosslinking agent, comprising, by mass: urotropine 0.1%, phenol 0.008%, dimethyl sulfoxide 0.015%, potassium carbonate 0.008%, tartaric acid 0.03%, gluconate 0.03%, urea 0.015%, barium hydroxide 0.009%, thiourea 0.013% and the balance water.
The preparation method comprises the following steps:
s1, adding urotropine, dimethyl sulfoxide, potassium carbonate, urea and thiourea into water, mixing, and stirring for 25 minutes to obtain a mixture;
s2, adding phenol, tartaric acid, gluconate and barium hydroxide into the mixture, and stirring for 20 minutes to obtain the deep profile control crosslinking agent.
Comparative example 1
A crosslinking agent, the crosslinking agent comprising, by mass: 0.08% of paraformaldehyde, 0.01% of resorcinol and the balance of water.
Comparative example 2
A crosslinking agent, the crosslinking agent comprising, by mass: urotropine 0.1%, phenol 0.008% and water in balance.
Experimental example
Preparing polyacrylamide into 0.25% aqueous solution, adding 0.2%, 0.3%, 0.4%, 0.5%, 0.6% and 0.8% of the cross-linking agent provided in example 1 and the cross-linking agent provided in comparative example 1 respectively, stirring uniformly, filling into a 200mL high-temperature bottle, putting into a constant-temperature water bath at 85 ℃ for a certain time, taking out, observing gel flowability with the same cross-linking agent, and measuring initial viscosity of gel at 6r/min by using a Brookfield rheometer at an LV rotor. The experimental results are shown in the following table:
according to the table, by introducing the composite auxiliary agent into the cross-linking agent provided by the method provided by the embodiment of the invention, more effective products are obtained, the glue forming degree can still reach more than 15000mPa.s after the dosage of the agent is reduced from 0.8% to 0.5% on the basis of unchanged cost, the glue forming time is more than 3 days, and the maximum time can be more than 10 days, so that the deep plugging requirement of high-temperature high-pressure oil reservoirs is met.
The thermal stability of the deep profile control crosslinking agent prepared in the example 1 and polyacrylamide gel formation is tested, and the specific method is as follows: the gel prepared in example 1 and prepared by reacting 0.5% deep profile control crosslinking agent with 0.25% polyacrylamide is kept warm at 85 ℃ for a long time, and the gel strength is tested periodically; the results are shown in the following table:
| aging time | For 30 days | For 60 days | 180 days |
| Viscosity of the mixture | 14500mPa·s | 10200mPa·s | 6850mPa·s |
The gel viscosity has a general trend of gradually weakening with time under the condition of constant temperature of 85 ℃, but the viscosity reduction amplitude gradually reduces and tends to be stable, and the gel has stronger plugging capability, thereby meeting the requirement of the field on profile control and water plugging viscosity higher than 3000 mPa.s.
And testing the plugging performance of the deep profile control crosslinking agent and polyacrylamide under the high-temperature condition after the deep profile control crosslinking agent and the polyacrylamide are glued. The experimental equipment used included: quartz sand (median particle size 0.15mm-0.30 mm), sand filling pipe (phi 25mm multiplied by 500 mm), horizontal pump, pressure gauge, electronic balance, deep profile control channeling sealing agent. The experimental method comprises the following steps: filling quartz sand into a sand filling pipe to prepare an artificial simulated rock core, measuring the pore volume of the rock core by a weighing method, and measuring the original permeability of the rock core; 3 groups of cores are connected in parallel, gel 0.2PV after 0.5% concentration deep profile control crosslinking agent prepared in the embodiment 1 reacts with 0.25% concentration polyacrylamide is introduced, the gel is subjected to waiting solidification at 85 ℃ for 72 hours, and the permeability after plugging of each core is measured respectively; the results are shown in the following table:
as can be seen from the above table, the gel prepared in example 1 can achieve a blocking rate of 87% or more at a high temperature of 85 ℃. And the original permeability, the permeability after plugging, the resistance factor and the plugging rate of the core 1 are higher than those of the core 2 and the core 3, and the corresponding plugging effect is better than that of the other two cores, which indicates that the gel formed by the deep profile control crosslinking agent and the polyacrylamide has better plugging effect on the high-permeability core.
Polyacrylamide is prepared into 0.25% aqueous solution, then 0.2%, 0.3%, 0.4%, 0.5%, 0.6% and 0.8% of the cross-linking agent provided in example 2 and the cross-linking agent provided in comparative example 2 are respectively added, stirred uniformly, filled into a 200mL high-temperature bottle, placed into a constant-temperature water bath at 85 ℃ for a certain time, taken out for observing gel flowability with the same amount of the cross-linking agent, and the initial viscosity of the gel is measured at 6r/min by a Brookfield rheometer on an LV rotor. The experimental results are shown in the following table:
according to the table, by introducing the composite auxiliary agent into the cross-linking agent provided by the method provided by the embodiment of the invention, more effective products are obtained, the glue forming degree can still reach more than 13000mPa.s after the dosage of the agent is reduced from 0.8% to 0.5% on the basis of unchanged cost, the glue forming time is more than 3 days, and the maximum time can be more than 10 days, so that the deep plugging requirement of high-temperature high-pressure oil reservoirs is met.
The thermal stability of the deep profile control crosslinking agent prepared in example 2 and polyacrylamide gel formation is tested, and the specific method is as follows: the gel prepared in example 2 and prepared by reacting 0.5% deep profile control crosslinking agent with 0.25% polyacrylamide is kept warm at 85 ℃ for a long time, and the gel strength is tested periodically; the results are shown in the following table:
| aging time | For 30 days | For 60 days | 180 days |
| Viscosity of the mixture | 11020mPa·s | 8500 mPa·s | 5690mPa·s |
The gel viscosity has a general trend of gradually weakening with time under the condition of constant temperature of 85 ℃, but the viscosity reduction amplitude gradually reduces and tends to be stable, and the gel has stronger plugging capability, thereby meeting the requirement of the field on profile control and water plugging viscosity higher than 3000 mPa.s.
And testing the plugging performance of the deep profile control crosslinking agent and polyacrylamide under the high-temperature condition after the deep profile control crosslinking agent and the polyacrylamide are glued. The experimental equipment used included: quartz sand (median particle size 0.15mm-0.30 mm), sand filling pipe (phi 25mm multiplied by 500 mm), horizontal pump, pressure gauge, electronic balance, deep profile control channeling sealing agent. The experimental method comprises the following steps: filling quartz sand into a sand filling pipe to prepare an artificial simulated rock core, measuring the pore volume of the rock core by a weighing method, and measuring the original permeability of the rock core; 3 groups of cores are connected in parallel, gel 0.2PV after 0.5% concentration deep profile control crosslinking agent prepared in the embodiment 2 reacts with 0.25% concentration polyacrylamide is introduced, the gel is subjected to waiting solidification at 85 ℃ for 72 hours, and the permeability after plugging of each core is measured respectively; the results are shown in the following table:
as can be seen from the above table, the gel prepared in example 2 can achieve a blocking rate of 86% or more at a high temperature of 85 ℃. The original permeability, the permeability after plugging, the resistance factor and the plugging rate of the core 4 are higher than those of the core 5 and the core 6, and the corresponding plugging effect is better than that of the other two cores, which indicates that the gel formed by the deep profile control cross-linking agent and the polyacrylamide has better plugging effect on the high-permeability core
The Liaohe oilfield three-zone H well has uneven water absorption and serious water channeling phenomenon, high permeability channels exist in stratum, and the production effect is poor year by year. In order to effectively control adverse effects of water channeling, the profile control agent prepared from the deep profile control cross-linking agent and the polymer provided in the embodiment 2 is used for implementing a plugging control measure on the well, so that the production effect is improved, and the use level is improved. The concrete construction process comprises the following steps: the treatment radius is designed to be 49m, the profile control dosage is 5850m3, and the displacement is 3-5m3/h. The initial injection construction pressure is 7.5MPa, and the construction pressure is slowly increased in the whole process.
After measures are taken, the water injection pressure of the well rises by 3.6MPa, the average water content is reduced from 92.6% to 80.5%, the average daily oil production of the well group rises from 5.8t to 8.6t, the accumulated oil increase is 856.5t, and the oil increase effect is remarkable.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) The depth profile control crosslinking agent provided by the embodiment of the invention has good pumping performance, the initial viscosity of the depth profile control crosslinking agent is lower than 10mPa.s, the pumping performance is good, and the original pipe column can be utilized for construction injection;
(2) The gelling time of the deep profile control cross-linking agent provided by the embodiment of the invention can be prolonged to 7 to 10 days, the requirement of long-distance migration in a high-pressure oil reservoir is met (the conventional cross-linking time is about 3 days at present), and deep profile control can be realized;
(3) The deep profile control crosslinking agent provided by the embodiment of the invention has good temperature resistance. The gel formed by the depth profile control crosslinking agent and the polymer can better maintain the strength within a certain time and temperature range, and meets the requirement of plugging a high-temperature oil reservoir;
(4) The plugging performance of the depth profile control crosslinking agent provided by the embodiment of the invention is controllable. The depth profile control crosslinking agent has good blocking effect on cores with different permeability, the blocking rate reaches more than 85%, and the depth profile control crosslinking agent has better blocking effect on cores with high permeability;
(5) The deep profile control crosslinking agent provided by the embodiment of the invention has obvious oil and water increasing and reducing effects when being applied to profile control water shutoff construction. In construction operation, the gel formed by the deep profile control cross-linking agent and the polymer has good temperature resistance and high plugging strength, can effectively plug high-permeability channels and large pore canals, and has obvious yield increasing effect.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (11)
1. The composite auxiliary agent is characterized by comprising the following raw materials in mass:
dimethyl sulfoxide 0.01-0.03 weight portions;
carbonate 0.008-0.012 portions;
0.02-0.05 part of tartaric acid;
0.03-0.05 part of lignosulfonate and/or gluconate;
0.01-0.03 part of sodium acetate and/or urea;
0.008-0.01 part of barium hydroxide;
thiourea 0.01-0.02 parts.
2. The composite aid of claim 1, wherein the carbonate comprises at least one of sodium carbonate and potassium carbonate.
3. The deep profile control crosslinking agent is characterized by comprising the following raw materials in mass:
0.06% -0.1% of a first cross-linking agent body;
0.005% -0.012% of a second crosslinker body;
dimethyl sulfoxide 0.01% -0.03%;
carbonate 0.008% -0.012%;
tartaric acid 0.02% -0.05%;
0.03% -0.05% of lignosulfonate and/or gluconate;
sodium acetate and/or urea 0.01% -0.03%;
barium hydroxide 0.008-0.01%;
thiourea 0.01% -0.02%;
the balance being water;
wherein the first crosslinker body comprises at least one of paraformaldehyde and urotropine, and the second crosslinker body comprises at least one of resorcinol, phenol, catechol, and hydroquinone.
4. A method of preparing the depth profile control cross-linking agent of claim 3, comprising:
mixing a first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea into water to obtain a mixture;
and mixing the mixture, the second cross-linking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide to obtain the deep profile control cross-linking agent.
5. The method for preparing the deep profile control cross-linking agent according to claim 4, wherein the first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea are mixed in water to obtain a mixture, and the mixing stirring time is 20min-30min.
6. The method for preparing the deep profile control cross-linking agent according to claim 4, wherein the mixing time of the mixture, the second cross-linking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide is 10min-20min.
7. The method for preparing the deep profile control cross-linking agent according to claim 4, wherein the first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea are mixed in water, and the adding sequence is the first cross-linking agent body, dimethyl sulfoxide, carbonate, sodium acetate and/or urea and thiourea.
8. The method for preparing the deep profile control cross-linking agent according to claim 4, wherein the step of mixing the mixture, the second cross-linking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide to obtain the deep profile control cross-linking agent specifically comprises the following steps:
and sequentially adding a second crosslinking agent body, tartaric acid, lignosulfonate and/or gluconate and barium hydroxide into the mixture to obtain the deep profile control crosslinking agent.
9. Use of a depth profile control cross-linking agent according to claim 3, wherein said use comprises using said cross-linking agent for profile control and water shutoff of a reservoir.
10. The use of the deep profile control cross-linking agent of claim 9, wherein the reservoir comprises one of a thin oil reservoir, a high pour oil reservoir, or a normal heavy oil reservoir.
11. The use of a depth profile control cross-linking agent according to claim 9, wherein the bottom layer temperature of the reservoir is below 120 ℃.
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