CN111350474B - Plugging method of secondary cross-linked interpenetrating network gel capable of realizing deep profile control and flooding - Google Patents
Plugging method of secondary cross-linked interpenetrating network gel capable of realizing deep profile control and flooding Download PDFInfo
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- CN111350474B CN111350474B CN202010155257.XA CN202010155257A CN111350474B CN 111350474 B CN111350474 B CN 111350474B CN 202010155257 A CN202010155257 A CN 202010155257A CN 111350474 B CN111350474 B CN 111350474B
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- 238000000034 method Methods 0.000 title claims abstract description 21
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- 239000012530 fluid Substances 0.000 claims abstract description 38
- 229920000642 polymer Polymers 0.000 claims abstract description 28
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 25
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 230000015271 coagulation Effects 0.000 claims abstract description 5
- 238000005345 coagulation Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 56
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 44
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims description 44
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 44
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 39
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 27
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 claims description 27
- 239000001632 sodium acetate Substances 0.000 claims description 27
- 235000017281 sodium acetate Nutrition 0.000 claims description 27
- 229910021556 Chromium(III) chloride Inorganic materials 0.000 claims description 26
- 229960000359 chromic chloride Drugs 0.000 claims description 26
- 239000007864 aqueous solution Substances 0.000 claims description 22
- 230000007062 hydrolysis Effects 0.000 claims description 21
- 238000006460 hydrolysis reaction Methods 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 18
- 238000004132 cross linking Methods 0.000 claims description 15
- 238000006136 alcoholysis reaction Methods 0.000 claims description 14
- 238000006116 polymerization reaction Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000013522 chelant Substances 0.000 claims description 4
- 230000002431 foraging effect Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 5
- 239000000499 gel Substances 0.000 description 97
- 238000003756 stirring Methods 0.000 description 15
- 239000003921 oil Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
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- 230000009471 action Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910001510 metal chloride Inorganic materials 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229920006322 acrylamide copolymer Polymers 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 150000003754 zirconium Chemical class 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
The invention discloses a plugging method of secondary cross-linked interpenetrating network gel capable of realizing deep profile control, which comprises the following steps: s1, pumping clear water in advance, and cleaning the near wellbore zone; s2, uniformly mixing the polymer system, the cross-linking agent system and water, wherein the solution is just in a fisheye shape, and forming a fluid solution; s3, after the fluid solution is prepared, pumping the fluid solution into the well bore through a pump, and pumping the fluid solution into the stratum through the well bore; s4, when the fluid is pumped, the fluid is continuously filled with clear water to be replaced into the deep part of the stratum, and then the fluid is shut in for coagulation to form gel; and S5, the fluid to be pumped is formed into gel after being coagulated and then is developed by water flooding. The plugging method has simple process, the plugged fluid gel has low cost, the shearing damage of the polymer in the seepage of a low-permeability reservoir can be relieved, and the deep plugging and profile control of the polymer gel are realized.
Description
Technical Field
The invention relates to a plugging method of secondary cross-linking interpenetrating network gel capable of realizing deep profile control, which is particularly suitable for working conditions that low-permeability heterogeneous reservoirs have serious gel shearing damage and polymer gel deep plugging is difficult to realize.
Background
Due to perennial water injection development of oil reservoirs, the reservoir heterogeneity is serious, and the problems of ineffective circulating water injection, high oil well water production rate and the like generally occur. In recent years, a weak gel system serving as a deep profile control agent and an oil displacement agent is widely applied to a heterogeneous oil reservoir to improve a water injection profile, improve the recovery rate of crude oil and obtain better effect in a high-permeability oil reservoir in the east. The low-permeability reservoir has different geological characteristics and reservoir physical properties from the medium-high permeability reservoir, and is particularly characterized by high formation water mineralization, serious heterogeneity, small pore channel radius, rough pore inner surface layer, high oil layer bound water saturation and the like, so that weak gel is seriously influenced by actions of shearing, adsorption, dilution and the like in deep migration.
The secondary cross-linked gel profile control and oil displacement technology is characterized in that secondary cross-linked gel is utilized to respectively generate primary cross-linking on the ground and in the stratum, molecular groups grow after the primary cross-linking, the entry of the molecular groups into a low-permeability oil reservoir is limited, the low-permeability oil reservoir is prevented from being polluted, the entry of a reservoir with larger pores or higher permeability is facilitated, the secondary cross-linking starts after the reservoir with larger pores or higher permeability enters, the gel strength is increased, and therefore the effects of plugging and oil displacement are achieved.
Chinese patent publication No. CN 106047330a, published 2016, 10, and 26, discloses a secondary crosslinking water-based gel crosslinking agent and a preparation method thereof, which is characterized in that a metal chloride and an alkali are mixed and reacted in water, and then an organic acid is added into the reacted system for mixing and reacting, so as to obtain the secondary crosslinking water-based gel crosslinking agent, wherein the molar ratio of the metal chloride, the alkali and the organic acid is 1: 2.4-3.25: 1.2 to 1.75. The document "research on secondary cross-linked gel profile control system for fractured reservoir" (qiling et al, fine petrochemical evolution, 2008, 10) discloses a secondary cross-linked gel profile control system, and determines the optimal formula of the system: the mass ratio of KYPAM (salt-resistant comb-type polyacrylamide) with the concentration of 1500-2000 mg/L, KYPAM to Cr- (3+) crosslinking agent is 20: 1-40: 1, the concentration of BD (second crosslinking agent) is 800-1200 mg/L, the concentration of RW (heat stabilizer) is 5-10 mg/L, and the pH value of the system is 9.0. However, the above patent documents are developed mainly for plugging a high permeability reservoir, particularly a fractured reservoir, and avoiding entering a low permeability reservoir. The publication number is CN106867487A, and discloses a temporary plugging diverter for reservoir transformation and a preparation method thereof, wherein the temporary plugging diverter is characterized by comprising the following components in percentage by mass: 30-45% of high molecular polymer particles; 0-4% of a cross-linking agent; 5% -12% of an expanding agent; 0.1 to 1 percent of gel breaker; oil, the balance; wherein the high molecular polymer particles are at least one of polyvinyl alcohol particles, polyacrylamide particles and polyacrylamide derivative particles; the cross-linking agent is at least one of boric acid, water-soluble borate, water-soluble chromium salt, water-soluble aluminum salt, water-soluble titanium salt and water-soluble zirconium salt; the swelling agent is polyacrylamide cross-linked resin particles or acrylamide and acrylic acid copolymer cross-linked resin particles or a combination of the polyacrylamide cross-linked resin particles and the acrylic acid copolymer cross-linked resin particles; the gel breaker is persulfate, the polymer dry particles are pumped into a main action area of the stratum before being dissolved and are in a near-wellbore zone, the strength of the dry particles is utilized to form plugging in a shot hole or a crack which is pressed open at the early stage, the plugging is in the near-wellbore zone, and the application target is to press the stratum from a new direction by using fluid for the fracturing or acidizing stimulation operation. Therefore, the development of a plugging method for deep profile control and flooding fluid capable of relieving the degree of shear damage of polymer gel in the seepage process of a low-permeability reservoir and realizing the low-permeability reservoir is urgently needed.
Disclosure of Invention
In order to relieve the degree of shearing damage of polymer gel in the seepage process of a low-permeability reservoir, the invention provides a secondary cross-linked interpenetrating network gel plugging method capable of realizing deep profile control.
The realization process of the invention is as follows:
a blocking method of secondary cross-linking interpenetrating network gel capable of realizing deep profile control comprises the following steps:
s1, pumping clear water in advance, and cleaning the near wellbore zone;
s2, uniformly mixing the polymer system, the cross-linking agent system and water, wherein the solution is just in a fisheye shape, and forming a fluid solution; wherein, in percent by total mass of the fluid solution being formed, the polymer system: 0.05-5%, and the effective mass percentage in the crosslinking system is as follows: 0.01 to 1 percent of the total weight of the mixture, and the balance of water; wherein the polymer system consists of polyacrylamide and polyvinyl alcohol; the cross-linking agent system consists of a chromium acetate system and a glutaraldehyde cross-linking agent;
s3, after the fluid solution is prepared, pumping the fluid solution into the well bore through a pump, and pumping the fluid solution into the stratum through the well bore;
s4, when the fluid is pumped, the fluid is continuously filled with clear water to be replaced into the deep part of the stratum, and then the fluid is shut in for coagulation to form gel;
and S5, the fluid to be pumped is formed into gel after being coagulated and then is developed by water flooding.
Further, the effective mass ratio of the polyacrylamide to the polyvinyl alcohol is 5: 1-2: 1.
further, the polyacrylamide is partially hydrolyzed polyacrylamide, the molecular weight is 800-2000 ten thousand, and the hydrolysis degree is 20-40%; the polymerization degree of the polyvinyl alcohol is 1700, and the alcoholysis degree of the polyvinyl alcohol is 70-92%.
Further, the chromium acetate system is a chromium acetate chelate formed by sodium acetate and chromium trichloride; the glutaraldehyde crosslinking agent is a glutaraldehyde aqueous solution with the mass percentage of 25-40%.
Further, the preparation method of the chromium acetate system comprises the following steps: and (3) placing the aqueous solution of sodium acetate and the aqueous solution of chromium trichloride into a 100mL wide-mouth bottle, sealing, using nitrogen for protection, standing in an oven with constant temperature of 50 ℃ for aging for 32 hours to form a chromium acetate system.
Further, the mass ratio of the sodium acetate to the chromium trichloride is 10: 1-2: 1, the effective mass ratio of the chromium acetate system to the glutaraldehyde is 10: 1-4: 1.
the invention has the following positive effects:
(1) the method for realizing the blocking is formed by adopting five steps, the blocking process is simple, the formula of the secondary cross-linked gel fluid contains two polymers and two cross-linking agents, the method is favorable for fully mixing the two polymers and the two cross-linking agents, and the friction resistance is reduced after the polymers are mixed, so that the pumping is favorable.
(2) The invention comprises the following components in parts by weight: polymer system: 0.05 to 5 percent; crosslinker system: 0.01 to 1 percent, and the balance of water. The mode has simple formula, low cost and good gelling property. Such specific ratios are chosen because they are determined by several experiments: if the concentration is too low, the gel is not easily formed, and if the concentration is too high, the formed gel is easily dehydrated.
(3) In the invention, the polymer system consists of two polymers, namely polyacrylamide and polyvinyl alcohol, wherein the effective mass ratio of the polyacrylamide to the polyvinyl alcohol is 5: 1-2: 1. such specific ratios are chosen because they are determined by several experiments: the proportion of the polyvinyl alcohol is too high, gel is not easy to form, and the gel with the too high proportion of the polyacrylamide has a larger gel breaking degree under the seepage action in a low-permeability reservoir.
(4) The gel fluid can be used in the field of profile control operation of low-permeability reservoirs, in particular to the field of deep profile control operation of low-permeability reservoirs.
(5) In the invention, the polyacrylamide is partially hydrolyzed polyacrylamide, the molecular weight is 800-2000 ten thousand, and the degree of hydrolysis is 20-40%; the polymerization degree of the polyvinyl alcohol is 1700, and the alcoholysis degree of the polyvinyl alcohol is 70-92%. The molecular weight and the degree of hydrolysis of polyacrylamide are chosen so as to facilitate its solubility in water, and so the gel formation with the crosslinking agent is also good. The polyvinyl alcohol is chosen to be soluble in water and to have a good degree of alcoholysis, and the gel formed with the crosslinker is also good.
(6) In the invention, the crosslinking agent is chromium acetate and glutaraldehyde, wherein the chromium acetate can be crosslinked with polyacrylamide, and the glutaraldehyde can be crosslinked with polyvinyl alcohol, and because the crosslinking conditions of the chromium acetate and the polyacrylamide and the crosslinking conditions of the glutaraldehyde and the polyvinyl alcohol are different, the final time of the formed gel is longer than that of a common polyacrylamide gel system, which is the core characteristic of the patent.
(7) In the invention, the cross-linking agent system is as follows: chromium acetate systems and glutaraldehyde. The chromium acetate system is as follows: the chelate is formed by sodium acetate and chromium trichloride, and the mass ratio of the sodium acetate to the chromium trichloride is 10: 1-2: 1, preparing; the glutaraldehyde crosslinking agent is water solution containing 5-40% of glutaraldehyde. The effective mass ratio of the chromium acetate to the glutaraldehyde is 10: 1-4: 1. such specific ratios are chosen because they are determined by several experiments: the proportion of the chromium acetate system is too high, the shearing resistance of the gel system is greatly weakened, and the proportion of the glutaraldehyde is too high, so that gel is not easy to form.
(8) The gel is suitable for low-permeability oil reservoirs with stratum temperatures within the range of 50-120 ℃, and has a good gelling effect and deep plugging capability within the temperature range.
Detailed Description
The present invention will be further described with reference to the following examples.
The method mainly aims at the situation that in the later stage of low-permeability water injection development, due to the fact that the water content of produced liquid is too high, weak gel needs to be injected into a reservoir stratum to adjust the swept area of injected water, and the weak gel of the reservoir stratum is seriously influenced by actions of shearing, adsorption, dilution and the like in deep migration, and adopts secondary crosslinking to form interpenetrating network gel, so that the shearing damage of polymer gel in low-permeability pores is relieved, and the deep profile control and flooding purpose of the low-permeability reservoir stratum is achieved.
Example 1
The best mode of the invention is as follows:
s1: pumping a certain amount of clear water by using a pump truck to clean a near-wellbore area;
s2: uniformly mixing the polymer system and the cross-linking agent system, wherein the solution is just in a fisheye shape, and a fluid solution is formed; the apparatus used for mixing is not limited in any way, and any apparatus commonly used in the art, such as a stirring pump, may be used.
S3: after the fluid solution is prepared, the fluid solution is pumped into a shaft by a pump and pumped into the stratum through the shaft, the gel is not gelatinized under the surface temperature condition, and the gel is easy to pump because of low friction resistance of the mixed polymer, and is pumped according to the designed amount of a construction well.
S4: after the fluid is pumped, the fluid is continuously replaced into the deep part of the stratum with clean water, and then the fluid reaches the position required by the stratum, the well is closed for waiting for coagulation, and as the temperature of the stratum is far higher than the surface of the ground, the polymer starts to react with the cross-linking agent under the condition of the temperature of the stratum, and gel with higher strength is gradually formed.
S5: and after the fluid is pumped to wait for coagulation to form gel, the development is continued by water flooding.
In the step S2, the polymer system is: 0.05 to 5 percent; the effective mass percentage of the crosslinking system is as follows: 0.01 to 1 percent of the total weight of the mixture, and the balance of water;
the polymer system consists of two polymers, namely polyacrylamide and polyvinyl alcohol, wherein the effective mass ratio of the polyacrylamide to the polyvinyl alcohol is 5: 1-2: 1.
the polyacrylamide is partially hydrolyzed polyacrylamide, the molecular weight is 800-2000 ten thousand, and the hydrolysis degree is 20-40%; the polymerization degree of the polyvinyl alcohol is 1700, and the alcoholysis degree of the polyvinyl alcohol is 70-92%.
The effective components of the cross-linking agent system are as follows: chromium acetate systems and glutaraldehyde.
The chromium acetate system is as follows: the method comprises the following steps of putting a sodium acetate aqueous solution and a chromium trichloride aqueous solution into a 100mL wide-mouth bottle, sealing, using nitrogen for protection, standing in a constant-temperature oven at 50 ℃ for aging for 32 hours, wherein the sodium acetate and the chromium trichloride form a chelate, and the mass ratio of the sodium acetate to the chromium trichloride is 10: 1-2: 1, the concentration of the aqueous solution of sodium acetate is as follows, and the concentration of the aqueous solution of chromium trichloride is as follows; the glutaraldehyde crosslinking agent is a water solution containing 25-50% of glutaraldehyde, and the effective mass ratio of chromium acetate to glutaraldehyde is 10: 1-4: 1. the preparation process of the chromium acetate system in the method of the invention refers to documents (picnic, bear, Zhang Liang, Rotao, Liuguo weight, indoor research of low-temperature crosslinking weak gel system [ J ]. oil and gas field ground engineering, 2011.30(3):18-20.)
Raw materials and sources thereof:
polyacrylamide, molecular weight 1200 ten thousand, degree of hydrolysis 25%: beijing Hengji chemical industry group, Limited liability company.
Polyacrylamide, molecular weight 1600 ten thousand, degree of hydrolysis 30%: beijing Hengji chemical industry group, Limited liability company.
Polyvinyl alcohol, degree of polymerization 1700, degree of alcoholysis 88%: chengdu Kelong chemical engineering Co.
Polyvinyl alcohol, degree of polymerization 1700, degree of alcoholysis 92%: chengdu Kelong chemical engineering Co.
Sodium acetate: chengdu Kelong chemical engineering Co.
Chromium trichloride: chengdu Kelong chemical engineering Co.
Glutaraldehyde 25% aqueous solution: chengdu Kelong chemical engineering Co.
Test performance and test method:
viscosity: viscosity measurements were performed for different periods of time using a brookfield viscometer.
And (3) testing the shearing resistance: shearing the mixture by a rotary shearing machine at the rotating speed of 3000 rpm for 5 minutes, then placing the mixture at a constant temperature of 80 ℃, and measuring the strength of the plugging agent of the profile control agent at intervals.
Example 2
As another preferred embodiment of the invention, the components and mass ratio are as follows: 0.3 percent of polyacrylamide (with the molecular weight of 1200 ten thousand and the hydrolysis degree of 25 percent) and 0.1 percent of polyvinyl alcohol (with the polymerization degree of 1700 and the alcoholysis degree of 88 percent), 0.05 percent of chromium acetate with effective mass (the mass ratio of sodium acetate to chromium trichloride is 10: 1), 0.008 percent of glutaraldehyde with effective mass and the balance of water, and the gelling temperature is 60 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of 60 ℃. Compared with a conventional gel formula which only contains polyacrylamide crosslinked gel, the gel of the invention has the advantages that 0.3 percent of polyacrylamide (with the molecular weight of 1200 ten thousand and the hydrolysis degree of 25 percent) and 0.05 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 10: 1), the gelling temperature is 60 ℃, and the evaluation experiment results are as follows. The rest is the same as example 1.
Viscosity of gels at different time periods
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 3257mPa.s | 3687mPa.s | 4038mPa.s | 4875mPa.s |
| Conventional gels | 3395mPa.s | 4125mPa.s | 4057mPa.s | 3897mPa.s |
Viscosity of gel at different time periods after shearing
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 587mPa.s | 1567mPa.s | 2365mPa.s | 3854mPa.s |
| Conventional gels | 575mPa.s | 855mPa.s | 1544mPa.s | 1839mPa.s |
Example 3
As another preferred embodiment of the invention, the components and mass ratio are as follows: 0.3 percent of polyacrylamide (with the molecular weight of 1600 ten thousand and the hydrolysis degree of 30 percent) and 0.1 percent of polyvinyl alcohol (with the polymerization degree of 1700 and the alcoholysis degree of 92 percent), 0.05 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 5: 1), 0.01 percent of glutaraldehyde and the balance of water, and the gelling temperature is 70 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of 70 ℃. Compared with a conventional gel formula which only contains polyacrylamide crosslinked gel, the gel of the invention has the advantages that 0.3 percent of polyacrylamide (with the molecular weight of 1600 ten thousand and the hydrolysis degree of 30 percent) and 0.05 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 5: 1), the gelling temperature is 70 ℃, and the evaluation experiment results are as follows. The rest is the same as example 1.
Viscosity of gels at different time periods
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 5574mPa.s | 6985mPa.s | 7253mPa.s | 7625mPa.s |
| Conventional gels | 5485mPa.s | 5897mPa.s | 6234mPa.s | 6375mPa.s |
Viscosity of gel at different time periods after shearing
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 1524mPa.s | 2864mPa.s | 4218mPa.s | 4765mPa.s |
| Conventional gels | 1325mPa.s | 1875mPa.s | 2158mPa.s | 2687mPa.s |
Example 4
As another preferred embodiment of the invention, the components and mass ratio are as follows: 0.03 percent of polyacrylamide (with the molecular weight of 1200 ten thousand and the hydrolysis degree of 25 percent) and 0.02 percent of polyvinyl alcohol (with the polymerization degree of 1700 and the alcoholysis degree of 92 percent), 0.05 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 5: 1), 0.01 percent of glutaraldehyde and the balance of water, and the gelling temperature is 80 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of 80 ℃. Compared with a conventional gel formula which only contains polyacrylamide crosslinked gel, the gel of the invention has the advantages that 0.03 percent of polyacrylamide (with the molecular weight of 1200 ten thousand and the hydrolysis degree of 25 percent) and 0.05 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 5: 1), the gelling temperature is 80 ℃, and the evaluation experiment results are as follows. The rest is the same as example 1.
Viscosity of gels at different time periods
Viscosity of gel at different time periods after shearing
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 1244mPa.s | 2432mPa.s | 3895mPa.s | 4384mPa.s |
| Conventional gels | 985mPa.s | 1475mPa.s | 1868mPa.s | 2257mPa.s |
Example 5
As another preferred embodiment of the invention, the components and mass ratio are as follows: 0.2 percent of polyacrylamide (with a molecular weight of 1600 ten thousand and a hydrolysis degree of 30 percent) and 0.1 percent of polyvinyl alcohol (with a polymerization degree of 1700 and an alcoholysis degree of 88 percent), 0.04 percent of chromium acetate (with a mass ratio of sodium acetate to chromium trichloride of 5: 1), 0.01 percent of glutaraldehyde (with a mass ratio of 35 percent of glutaraldehyde aqueous solution) and the balance of water, wherein the gelling temperature is 90 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of a temperature of 90 ℃. Compared with a conventional gel formula which only contains polyacrylamide crosslinked gel, the gel of the invention has the advantages that 0.2 percent of polyacrylamide (with the molecular weight of 1600 ten thousand and the hydrolysis degree of 30 percent) and 0.04 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 5: 1), the gelling temperature is 90 ℃, and the evaluation experiment results are as follows. The rest is the same as example 1.
Viscosity of gels at different time periods
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 2657mPa.s | 4157mPa.s | 5287mPa.s | 5685mPa.s |
| Conventional gels | 2449mPa.s | 3682mPa.s | 4215mPa.s | 4255mPa.s |
Viscosity of gel at different time periods after shearing
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 455mPa.s | 1687mPa.s | 2687mPa.s | 3244mPa.s |
| Conventional gels | 437mPa.s | 785mPa.s | 1254mPa.s | 1544mPa.s |
Example 6
As another preferred embodiment of the invention, the components and mass ratio are as follows: 2 percent of polyacrylamide (with the molecular weight of 800 ten thousand and the hydrolysis degree of 40 percent) and 1 percent of polyvinyl alcohol (with the polymerization degree of 1700 and the alcoholysis degree of 88 percent), 0.1 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 4: 1) with effective mass, 0.05 percent of glutaraldehyde (with the mass ratio of 5 percent of glutaraldehyde aqueous solution) with the balance of water, and the gelling temperature is 80 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of 80 ℃. Compared with a conventional gel formula which only contains polyacrylamide crosslinked gel, 2% of polyacrylamide (with the molecular weight of 800 ten thousand and the hydrolysis degree of 30%) and 0.1% of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride being 4: 1) have the gelling temperature of 80 ℃, and the evaluation experiment results show that the gel has a long-time tackifying effect and has strong viscosity recovery after shearing. The rest is the same as example 1.
Viscosity of gels at different time periods
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 1025mPa.s | 1574mPa.s | 3547mPa.s | 5475mPa.s |
| Conventional gels | 1154mPa.s | 1254mPa.s | 2584mPa.s | 2635mPa.s |
Viscosity of gel at different time periods after shearing
| Time | 24 hours | 48 hours | 72 hours | 96 hours |
| Gels of the invention | 265mPa.s | 854mPa.s | 1585mPa.s | 3244mPa.s |
| Conventional gels | 223mPa.s | 423mPa.s | 547mPa.s | 1025mPa.s |
Example 7
As another preferred embodiment of the invention, the components and mass ratio are as follows: 0.5 percent of polyacrylamide (with the molecular weight of 800 ten thousand and the hydrolysis degree of 20 percent) and 0.1 percent of polyvinyl alcohol (with the polymerization degree of 1700 and the alcoholysis degree of 70 percent), 0.9 percent of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 2: 1), 0.1 percent of glutaraldehyde (with the mass ratio of 40 percent of glutaraldehyde aqueous solution) and the balance of water, and the gelling temperature is 80 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of 80 ℃. Compared with a conventional gel formula, namely the gel only contains polyacrylamide crosslinked gel, the gel has the advantages that 0.5% of polyacrylamide (with the molecular weight of 800 ten thousand and the hydrolysis degree of 20%) and 0.9% of chromium acetate (with the mass ratio of sodium acetate to chromium trichloride of 2: 1), the gelling temperature is 80 ℃, the gel has a long-time tackifying effect, and the viscosity is recovered after shearing.
Example 8
As another preferred embodiment of the invention, the components and mass ratio are as follows: 0.04 percent of polyacrylamide (molecular weight of 2000 ten thousand, hydrolysis degree of 40 percent) and 0.01 percent of polyvinyl alcohol (polymerization degree of 1700 and alcoholysis degree of 70 percent), 0.009 percent of chromium acetate (mass ratio of sodium acetate to chromium trichloride is 2: 1), 0.001 percent of glutaraldehyde (mass ratio of 40 percent of glutaraldehyde aqueous solution) and the balance of water, and the gelling temperature is 80 ℃. Dissolving chromium acetate and glutaraldehyde into an aqueous solution according to a set mass, then dissolving polyvinyl alcohol into water under a stirring condition, continuously dissolving polyacrylamide into water under the stirring condition after the polyvinyl alcohol is dissolved, and testing the viscosity change at different times under the condition of 80 ℃. Compared with a conventional gel formula, namely the gel only contains polyacrylamide crosslinked gel, the gel has the advantages that 0.04 percent of polyacrylamide (the molecular weight is 2000 ten thousand, the hydrolysis degree is 40 percent) and 0.009 percent of chromium acetate (the mass ratio of sodium acetate to chromium trichloride is 2: 1), the gelling temperature is 80 ℃, the gel has a long-time tackifying effect, and the viscosity is recovered after shearing.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and is not intended to limit the invention to the particular forms disclosed. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. A blocking method of secondary cross-linking interpenetrating network gel capable of realizing deep profile control is characterized by comprising the following steps:
s1, pumping clear water in advance, and cleaning the near wellbore zone;
s2, uniformly mixing the polymer system, the cross-linking agent system and water, wherein the solution is just in a fisheye shape, and forming a fluid solution; wherein, in percent by total mass of the fluid solution being formed, the polymer system: 0.05-5%, and the effective mass percentage in the crosslinking system is as follows: 0.01 to 1 percent of the total weight of the mixture, and the balance of water; wherein the polymer system consists of polyacrylamide and polyvinyl alcohol; the cross-linking agent system consists of a chromium acetate system and a glutaraldehyde cross-linking agent;
s3, after the fluid solution is prepared, pumping the fluid solution into the well bore through a pump, and pumping the fluid solution into the stratum through the well bore;
s4, when the fluid is pumped, the fluid is continuously filled with clear water to be replaced into the deep part of the stratum, and then the fluid is shut in for coagulation to form gel;
s5, developing by water flooding after the fluid to be pumped is coagulated to form gel;
wherein the effective mass ratio of the polyacrylamide to the polyvinyl alcohol is 5: 1-2: 1;
the polyacrylamide is partially hydrolyzed polyacrylamide, the molecular weight is 800-2000 ten thousand, and the hydrolysis degree is 20-40%; the polymerization degree of the polyvinyl alcohol is 1700, and the alcoholysis degree of the polyvinyl alcohol is 70-92%;
the chromium acetate system is a chromium acetate chelate formed by sodium acetate and chromium trichloride; the glutaraldehyde crosslinking agent is a glutaraldehyde aqueous solution with the mass percentage of 25-40%.
2. The plugging method of the secondary cross-linked interpenetrating network gel capable of realizing deep profile control according to claim 1, characterized in that: the preparation method of the chromium acetate system comprises the following steps: and (3) placing the aqueous solution of sodium acetate and the aqueous solution of chromium trichloride into a 100mL wide-mouth bottle, sealing, using nitrogen for protection, standing in an oven with constant temperature of 50 ℃ for aging for 32 hours to form a chromium acetate system.
3. The plugging method of the secondary cross-linked interpenetrating network gel capable of realizing deep profile control according to claim 2, characterized in that: the mass ratio of the sodium acetate to the chromium trichloride is 10: 1-2: 1, the effective mass ratio of the chromium acetate system to the glutaraldehyde is 10: 1-4: 1.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475667A (en) * | 2009-01-23 | 2009-07-08 | 成都理工大学 | Temperature-resistant salt-resistant efficient gel, and preparation and use thereof |
| CN101787864A (en) * | 2010-03-15 | 2010-07-28 | 中国石油集团川庆钻探工程有限公司 | Method for plugging water from oil reservoir fractured water logging oil well developed by injecting water into low-permeable reservoir stratum |
| CN103361039A (en) * | 2013-08-02 | 2013-10-23 | 中国石油集团川庆钻探工程有限公司 | Blocking method adopting fluid gel for producing blocking valve by formation temperature to block gas reservoir |
| CN103468230A (en) * | 2013-08-12 | 2013-12-25 | 中国石油天然气股份有限公司 | Secondary crosslinking, profile modification and profile control agent, and preparation method and application thereof |
| CN104479653A (en) * | 2014-12-11 | 2015-04-01 | 西安石油大学 | Retarding-swelling salt-tolerant high-viscoelasticity particles with interpenetrating network structure and preparation method thereof |
| CN105275440A (en) * | 2015-11-02 | 2016-01-27 | 中庆能源工程技术有限公司 | Oilfield profile and drive control blocking system, method and slug composition for blocking |
| CN109666469A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | Multi net voting type single dispersed polyacrylamide quasi polymer gel micro-ball and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9090812B2 (en) * | 2011-12-09 | 2015-07-28 | Baker Hughes Incorporated | Self-inhibited swell packer compound |
| US9976390B2 (en) * | 2015-03-30 | 2018-05-22 | Baker Hughes, A Ge Company, Llc | Drilling fluids with leakoff control and drill cuttings removal sweeps |
| CN110484225A (en) * | 2019-09-17 | 2019-11-22 | 新疆克拉玛依市采丰实业有限责任公司 | A kind of organic composite type oily sludge gel and preparation method thereof |
| CN110565392A (en) * | 2019-09-25 | 2019-12-13 | 长安大学 | Preparation method of geotextile material capable of adjusting temperature change |
-
2020
- 2020-03-09 CN CN202010155257.XA patent/CN111350474B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475667A (en) * | 2009-01-23 | 2009-07-08 | 成都理工大学 | Temperature-resistant salt-resistant efficient gel, and preparation and use thereof |
| CN101787864A (en) * | 2010-03-15 | 2010-07-28 | 中国石油集团川庆钻探工程有限公司 | Method for plugging water from oil reservoir fractured water logging oil well developed by injecting water into low-permeable reservoir stratum |
| CN103361039A (en) * | 2013-08-02 | 2013-10-23 | 中国石油集团川庆钻探工程有限公司 | Blocking method adopting fluid gel for producing blocking valve by formation temperature to block gas reservoir |
| CN103468230A (en) * | 2013-08-12 | 2013-12-25 | 中国石油天然气股份有限公司 | Secondary crosslinking, profile modification and profile control agent, and preparation method and application thereof |
| CN104479653A (en) * | 2014-12-11 | 2015-04-01 | 西安石油大学 | Retarding-swelling salt-tolerant high-viscoelasticity particles with interpenetrating network structure and preparation method thereof |
| CN105275440A (en) * | 2015-11-02 | 2016-01-27 | 中庆能源工程技术有限公司 | Oilfield profile and drive control blocking system, method and slug composition for blocking |
| CN109666469A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | Multi net voting type single dispersed polyacrylamide quasi polymer gel micro-ball and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| HPAM_wy_316乳酸铬凝胶体系的室内研究;杨鸿剑等;《新疆石油天然气》;20101215;第6卷(第4期);第86-88页 * |
| 低温交联弱凝胶体系的室内研究;胡艾国等;《油气田地面工程》;20110320;第30卷(第3期);第18-20页 * |
| 有机铬_活性酚醛树脂交联聚合物弱凝胶及其在濮城油田调驱中的应用;蒲万芬等;《油田化学》;20040930;第21卷(第3期);第260-263页 * |
| 调剖驱油技术中弱凝胶体系研究进展;许定佳等;《化工进展》;20150505;第34卷(第5期);第1323-1330页 * |
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