CN117143579A - Formula and construction method of in-situ porous polymer gel - Google Patents
Formula and construction method of in-situ porous polymer gel Download PDFInfo
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- CN117143579A CN117143579A CN202311130935.7A CN202311130935A CN117143579A CN 117143579 A CN117143579 A CN 117143579A CN 202311130935 A CN202311130935 A CN 202311130935A CN 117143579 A CN117143579 A CN 117143579A
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 229920000642 polymer Polymers 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 title abstract description 5
- 238000009472 formulation Methods 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- 239000003921 oil Substances 0.000 claims abstract description 24
- 239000004530 micro-emulsion Substances 0.000 claims abstract description 21
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 15
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 7
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 6
- 239000000839 emulsion Substances 0.000 claims abstract description 5
- 238000009775 high-speed stirring Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 13
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 claims description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 10
- 239000004202 carbamide Substances 0.000 claims description 10
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical group C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims 2
- 235000016068 Berberis vulgaris Nutrition 0.000 claims 1
- 241000335053 Beta vulgaris Species 0.000 claims 1
- 150000001298 alcohols Chemical class 0.000 claims 1
- 150000001335 aliphatic alkanes Chemical class 0.000 claims 1
- 235000019270 ammonium chloride Nutrition 0.000 claims 1
- 229920000578 graft copolymer Polymers 0.000 claims 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims 1
- 230000007062 hydrolysis Effects 0.000 claims 1
- 238000006460 hydrolysis reaction Methods 0.000 claims 1
- 239000003350 kerosene Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 14
- 239000011148 porous material Substances 0.000 abstract description 3
- 239000000499 gel Substances 0.000 description 51
- 238000005303 weighing Methods 0.000 description 20
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 18
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 10
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 9
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 9
- 229940094933 n-dodecane Drugs 0.000 description 7
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 description 5
- 229930182555 Penicillin Natural products 0.000 description 5
- JGSARLDLIJGVTE-MBNYWOFBSA-N Penicillin G Chemical compound N([C@H]1[C@H]2SC([C@@H](N2C1=O)C(O)=O)(C)C)C(=O)CC1=CC=CC=C1 JGSARLDLIJGVTE-MBNYWOFBSA-N 0.000 description 5
- 239000002283 diesel fuel Substances 0.000 description 5
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 5
- 229940049954 penicillin Drugs 0.000 description 5
- IVKNZCBNXPYYKL-UHFFFAOYSA-N 2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO)C=C1 IVKNZCBNXPYYKL-UHFFFAOYSA-N 0.000 description 4
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 3
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 3
- 229960003237 betaine Drugs 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 235000015110 jellies Nutrition 0.000 description 2
- 239000008274 jelly Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-M Methanesulfonate Chemical compound CS([O-])(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-M ethenesulfonate Chemical compound [O-]S(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-M 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229940051250 hexylene glycol Drugs 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 229940113162 oleylamide Drugs 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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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)
- Oil, Petroleum & Natural Gas (AREA)
- Colloid Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention provides a formula of porous gel capable of spontaneously generating in an oil reservoir environment and a construction method thereof, and relates to the technical field of oilfield chemistry. The porous gel system consists of a polymer main agent, a cross-linking agent, an auxiliary agent, an in-situ gas production additive A, an in-situ gas production additive B, an emulsifying agent and low molecular hydrocarbon. The preparation method comprises the following steps: dissolving an in-situ gas-generating additive A in water, preparing oil external phase microemulsion by adding low molecular hydrocarbon and an emulsifying agent, and preparing multiple emulsion by adding an auxiliary agent, a polymer main agent, an in-situ gas-generating additive B and a water phase formed by a crosslinking agent into the microemulsion under the condition of high-speed stirring. The in-situ generated porous polymer gel provided by the invention can be suitable for stratum environment at 80-100 ℃, and a gel system with communicated pores can be generated in situ under the condition of oil reservoir, so that the gel system has higher gel strength and incomplete plugging. Partial plugging of the hypertonic layer can be realized, and damage to the reservoir layer caused by excessive plugging is avoided.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to an in-situ generated porous polymer gel system and a preparation method thereof.
Background
Most of the old oil fields in China enter a high water content stage, so that the economic benefit is greatly reduced. In order to improve the extraction rate and the water content of the extracted liquid, a profile control and water shutoff means is adopted to block a hypertonic layer, adjust the water absorption profile and improve the flow channel distribution at the same time, which is a common means in oil fields.
The polymer gel system has the characteristics of high plugging strength and good plugging effect, and is the most common system for oilfield plugging control in China. At present, a plurality of patents aiming at a polymer gel system exist, and the optimization is carried out from various directions such as temperature resistance, salt resistance, gel forming stability and the like. For example, patent CN116333704a discloses a gel system for rapid gel formation under high temperature and high salt conditions and a preparation method thereof. The system is an improved phenolic jelly system, and is applicable to oil reservoirs with the temperature of 150 ℃ and the mineralization degree of more than 200000 mg/L. While patent CN114634805a discloses a self-growing gel dispersion system suitable for hypotonic-tight reservoirs and a method for controlling the same. The main components of the gel composition are acrylamide/vinyl sulfonate/acrylamide methyl sulfonate polymer and a cross-linking agent, and the particle size of the gel composition can be regulated and controlled by adding a nano reinforcing agent. The patent CN111499797A discloses another high-temperature-resistant high-strength gel, which comprises the components of acrylamide/2-acrylamido-2-methylpropanesulfonic acid, and can realize high-strength blocking by adding an initiator, a cross-linking agent and a montmorillonite additive. The patent CN113249102A discloses a slow cross-linking gel for profile control of a medium-high temperature oil reservoir and a preparation method thereof, and the slow gel forming of an acrylamide polymer gel system under the medium-high temperature oil reservoir (90-110 ℃) can be realized by adding a stabilizer, an accelerator, a catalyst and the like, the gel forming time is within 72-168 hours, and the gel has high strength and good stability.
Although the current polymer gel system has been developed in various performance dimensions, if the gel system is excessively plugged in the plugging process, damage to a reservoir layer is caused, so that subsequent construction is difficult to perform. Therefore, the preparation of the porous gel meeting the strength requirement can realize moderate and effective plugging of the stratum and meet the oil reservoir requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the polymer gel system with communicating pores which is spontaneously generated in the stratum is provided, and the preparation method of the polymer gel system is provided, so that reservoir damage caused by excessive plugging possibly caused in the plugging process is avoided, meanwhile, the gel strength of the polymer gel system can ensure to realize plugging adjustment, thereby improving the sweep range of the reservoir and strengthening the matrix oil extraction effect. The self-generated communicating porous is brought by self-generated gas of an in-situ gas generating agent in a system in the gel forming process, the applicable temperature range is higher than the cloud point of the nonionic surfactant, so that the solubility of the nonionic surfactant is reduced, and meanwhile, the demulsification self-generated gas and polymer gel forming process is realized, so that the target gel is obtained.
In order to achieve the above object, the present invention provides an in-situ porous polymer gel system; the gel system consists of a polymer main agent, a cross-linking agent, an auxiliary agent, an in-situ gas production additive A, an in-situ gas production additive B, an emulsifying agent and low molecular hydrocarbon.
Preferably, the polymer main agent is an acrylamide/AMPS copolymer, and the molecular weight is 800w and above;
preferably, the crosslinking agent is urotropine, hydroquinone and N, N-methylene bisacrylamide;
preferably, the emulsifier is a combination of alkylphenol ethoxylates surfactant, betaine surfactant, span surfactant and sodium dodecyl sulfate;
preferably, the auxiliary agent is a combination of n-butanol and hexanediol, and the combination ratio is 1:1-3:1;
preferably, the in situ gas generating additive is nitrous acid (additive a) and urea (additive B);
preferably, the low molecular hydrocarbon is the combination of diesel oil and n-dodecane, and the combination ratio is 1:1-7:1;
the second aspect of the invention provides a method for preparing an in-situ generated porous gel system, which comprises the following steps:
(1) Adding the in-situ gas generating additive A of claim 4 into water, and uniformly stirring to obtain a water phase A;
(2) Mixing the water phase A with the oil phase in the claim 5 according to a required proportion, adding the auxiliary agent and the emulsifier in the claim 3, and uniformly stirring to prepare an oil external phase microemulsion;
(3) Adding the in-situ gas generating additive B and the polymer main agent in water, and stirring to obtain a water phase B;
(4) Adding the oil external phase microemulsion and the cross-linking agent into the water phase B under high-speed stirring to prepare multiple emulsion;
(5) And heating the multiple emulsion to form gel to obtain the in-situ porous polymer gel system.
Preferably, in the step (1), the dosage of the in-situ gas generating additive A is 10-30%, and the stirring speed is 200-500 r/min.
Preferably, in the step (2), the oil-water ratio is 2:1-8:1; the ratio of the emulsifier to the auxiliary agent is 2:1-4:1; the total concentration of the emulsifying agent and the auxiliary agent is 20% -50%; the stirring speed is 200 r/min-400 r/min, and the stirring time is more than 30 minutes.
Preferably, in the step (3), the dosage of the in-situ gas generating additive B is 7% -45%; the dosage of the polymer main agent is 1% -8.5%.
Preferably, in the step (4), the amount of the cross-linking agent is 0.3-1%, and the amount of the microemulsion is 20-50%.
Preferably, in the step (4), the cross-linking agent is added first, and then the micro-emulsion is added after stirring at a low speed (200 r/min-500 r/min) for 1-5 min, and then the micro-emulsion is stirred at a high speed (1000 r/min-3000 r/min) for 1-5 min.
Preferably, in step (5), the heating temperature is from 85 ℃ to 95 ℃.
Compared with the prior art, the method has the following advantages:
(1) According to the in-situ self-generated porous gel system, communication pores are generated simultaneously when the gel spontaneously forms gel in the stratum, so that the gel can not completely block a hypertonic reservoir, but can be partially blocked. The occurrence of excessive blocking caused by factors such as construction, medicament types and the like is avoided, the pollution of a reservoir is avoided, and the liquid production capacity of the reservoir is protected.
(2) The in-situ self-generating porous gel system can realize spontaneous gas generation in a stratum, and the generation of the gas can generate a foam-like system so as to further improve the heterogeneity of a reservoir.
(3) The components such as the emulsifier, the auxiliary agent, the low molecular hydrocarbon and the like contained in the in-situ self-generated porous gel system can generate dilution and emulsification oil carrying effects with crude oil, play a role in improving the oil washing efficiency in a matrix, realize high-efficiency drainage and driving, and further improve the recovery ratio.
(4) The system disclosed by the invention is simple to prepare, can be kept stable for a long time after being prepared, and can be effectively simplified in production and transportation.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will readily appreciate that the present invention is well adapted to carry out the specific and specific applications disclosed herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all without departing from the spirit of the Bei Liben invention. Before the embodiments of the invention are explained in further detail, it is to be understood that the invention is not limited in its scope to the particular embodiments described below; it is also to be understood that the terminology used in the examples of embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. Where numerical ranges are provided, it is understood that unless otherwise stated, any number at the end of each range and within is optional.
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. It should be noted that the raw materials mentioned in the present invention are all common raw materials on the market, and the sources are not particularly limited.
Example 1:
the gel system comprises the following raw materials: polyacrylamide, urotropine, hydroquinone, span80, SDS, OP-10, n-butanol, n-dodecane, nitrous acid and urea.
The preparation method comprises the following specific preparation steps:
(1) 30g of nitrous acid is weighed and added into 70mL of water, and stirred for 3min at the speed of 200r/min to obtain a water phase A;
(2) Weighing 20mL of water phase A and 50mL of n-dodecane, adding into a beaker, stirring at the speed of 300r/min for 1min, weighing 5.31g Span80,3.55g SDS,1.15g OP-10 and 4.92g of n-butanol, adding into the beaker, and continuously stirring at the same speed for 5min to obtain an oil external phase microemulsion;
(3) Weighing 5g of urea and 1g of polymer, adding into water, and stirring for 60min at a stirring speed of 300r/min to obtain a water phase B;
(4) Weighing 0.3g urotropine and 0.3g hydroquinone, adding into 80mL water phase B, and stirring for 3min at 300 r/min; weighing 20g of microemulsion, adding the microemulsion into the water phase B, and stirring for 5min at a stirring speed of 1500 r/min;
(5) Pouring the gel system into a penicillin bottle for sealing, and placing the penicillin bottle into a 80 ℃ kettle for gel forming.
Example 2:
the gel system comprises the following raw materials: polyacrylamide/2-acrylamido-2-methylpropanesulfonic acid, urotropine, N, N-methylenebisacrylamide, hydroquinone, span80, SDS, oleylamide allyl betaine, hexylene glycol, diesel oil, N-dodecane, nitrous acid, urea.
The preparation method comprises the following specific preparation steps:
(1) 30g of nitrous acid is weighed and added into 70mL of water, and stirred for 3min at the speed of 200r/min to obtain a water phase A;
(2) Weighing 20mL of water phase A,10mL of diesel oil and 40mL of n-dodecane, adding into a beaker, stirring at the speed of 300r/min for 1min, weighing 3.78g Span80,2.19g SDS,2.31g oil-based amide allyl betaine and 5.63g of hexanediol, adding into the beaker, and continuously stirring at the same speed for 5min to obtain an oil external phase microemulsion;
(3) Weighing 5g of urea and 1g of polymer, adding into water, and stirring for 60min at a stirring speed of 300r/min to obtain a water phase B;
(4) Weighing 0.3g urotropine, 0.3g hydroquinone and 0.2g N, N-methylene bisacrylamide, adding into 80mL water phase B, and stirring for 3min at 300 r/min; weighing 20g of microemulsion, adding the microemulsion into the water phase B, and stirring for 5min at a stirring speed of 1500 r/min;
(5) Pouring the gel system into a penicillin bottle for sealing, and putting into a 90 ℃ kettle for gel forming.
Example 3:
the gel system comprises the following raw materials: polyacrylamide/2-acrylamido-2-methylpropanesulfonic acid, urotropine, N, N-methylenebisacrylamide, hydroquinone, span80, SDS, hexanediol, diesel oil, N-dodecane, nitrous acid, urea.
The preparation method comprises the following specific preparation steps:
(1) 30g of nitrous acid is weighed and added into 70mL of water, and stirred for 3min at the speed of 200r/min to obtain a water phase A;
(2) Weighing 20mL of water phase A,10mL of diesel oil and 40mL of n-dodecane, adding into a beaker, stirring at the speed of 300r/min for 1min, weighing 6.26g Span80,4.19g SDS and 4.48g of hexanediol, adding into the beaker, and continuously stirring at the same speed for 5min to obtain an oil external phase microemulsion;
(3) Weighing 5g of urea and 1g of polymer, adding into water, and stirring for 60min at a stirring speed of 300r/min to obtain a water phase B;
(4) Weighing 0.3g urotropine, 0.3g hydroquinone and 0.2g N, N-methylene bisacrylamide, adding into 80mL water phase B, and stirring for 3min at 300 r/min; weighing 20g of microemulsion, adding the microemulsion into the water phase B, and stirring for 5min at a stirring speed of 1500 r/min;
(5) Pouring the gel system into a penicillin bottle for sealing, and putting into 100 ℃ for gel forming.
Example 4:
the gel system comprises the following raw materials: polyacrylamide, urotropine, hydroquinone, span80, SDS, OP-10, n-butanol, n-dodecane, nitrous acid and urea.
The preparation method comprises the following specific preparation steps:
(1) 30g of nitrous acid is weighed and added into 70mL of water, and stirred for 3min at the speed of 200r/min to obtain a water phase A;
(2) Weighing 20mL of water phase A and 50mL of n-dodecane, adding into a beaker, stirring at the speed of 300r/min for 1min, weighing 5.31g Span80,3.55g SDS,1.15g OP-10 and 4.92g of n-butanol, adding into the beaker, and continuously stirring at the same speed for 5min to obtain an oil external phase microemulsion;
(3) Weighing 5g of urea and 1g of polymer, adding into water, and stirring for 60min at a stirring speed of 300r/min to obtain a water phase B;
(4) Weighing 0.3g urotropine and 0.3g hydroquinone, adding into 80mL water phase B, and stirring for 3min at 300 r/min; weighing 20g of microemulsion, adding the microemulsion into the water phase B, and stirring for 5min at a stirring speed of 1500 r/min;
(5) Pouring the gel system into a penicillin bottle for sealing, and putting into a 90 ℃ kettle for gel forming.
The strength and blocking effect of the jelly prepared in each example are shown in Table 1.
Table 1 gel time, strength and blocking ratio of each example
It can be seen that the four systems can be glued within a certain time, the glue forming strength is high, the requirements of oil field application are met, and profile control and water shutoff can be realized. And the plugging rate of the four systems at different temperatures is about 70%, which is different from the plugging rate of the traditional gel system at least 95%, and the plugging rate is obviously reduced after the communication is porous, but the plugging can also be realized.
Claims (11)
1. The in-situ porous polymer gel system is characterized by comprising a polymer main agent, a cross-linking agent, an auxiliary agent, an in-situ gas production additive A, an in-situ gas production additive B, an emulsifying agent and low molecular hydrocarbon.
2. A gel system according to claim 1, wherein the polymer base is an acrylamide polymer, including but not limited to polyacrylamides and acrylamide modified graft polymers of varying degrees of hydrolysis.
3. The gel system of claim 1, wherein the cross-linking agent is urotropin cross-linking agent and amide cross-linking agent; the emulsifier is oil-soluble emulsifier, beet alkaline emulsifier, water-soluble emulsifier and their combination; the auxiliary agent is micromolecular alcohols and a combination thereof.
4. A gel system according to claim 1, wherein the in situ gas generating additive is a water soluble in situ gas generating additive including, but not limited to, nitrous acid (additive a) and urea (additive B), nitrous acid (additive a) and ammonium chloride (additive B) and the like.
5. The gel system according to claim 1, wherein the low molecular hydrocarbons are one or more of diesel, kerosene, low molecular alkanes, and the like.
6. The method for preparing the in-situ porous polymer gel system as claimed in claims 1 to 5, which is characterized by comprising the following steps:
(1) Adding the in-situ gas generating additive A of claim 4 into water, and uniformly stirring to obtain a water phase A;
(2) Mixing the water phase A with the oil phase in the claim 5 according to a required proportion, adding the auxiliary agent and the emulsifier in the claim 3, and uniformly stirring to prepare an oil external phase microemulsion;
(3) Adding the in-situ gas generating additive B, the polymer main agent and the crosslinking agent into water, and stirring to obtain a water phase B;
(4) Adding the oil external phase microemulsion into the water phase B under high-speed stirring to prepare multiple emulsion;
(5) And heating the multiple emulsion to form gel to obtain the in-situ porous polymer gel system.
7. The method for preparing a gel system according to claim 6, wherein the amount of the in-situ gas-generating additive A in the step (1) is 5% -50%; the stirring speed is 100 r/min-2000 r/min.
8. The method for preparing a gel system according to claim 6, wherein the oil-water ratio in the step (2) is 1:1-9:1; the ratio of the emulsifier to the auxiliary agent is 1:1-4:1; the total concentration of the emulsifying agent and the auxiliary agent is 10% -70%; the stirring speed is 100 r/min-500 r/min.
9. The method for preparing a gel system according to claim 6, wherein the amount of the in-situ gas generating additive B in the step (3) is 5% -50%; the dosage of the polymer main agent is 0.4% -10%; the dosage of the cross-linking agent is 0.1-1%.
10. The method for preparing a gel system according to claim 6, wherein the high-speed stirring speed in the step (4) is 1000r/min to 3000r/min.
11. The method for preparing a gel system according to claim 6, wherein the heating temperature in the step (5) is 80 ℃ to 100 ℃.
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