CN112175595B - Temperature-resistant and salt-resistant profile control water shutoff agent - Google Patents
Temperature-resistant and salt-resistant profile control water shutoff agent Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 38
- 150000003839 salts Chemical class 0.000 title claims abstract description 24
- 229920000642 polymer Polymers 0.000 claims abstract description 30
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000005011 phenolic resin Substances 0.000 claims abstract description 17
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 17
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 9
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical group [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 26
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 18
- 235000019270 ammonium chloride Nutrition 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 9
- 230000033558 biomineral tissue development Effects 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 235000010265 sodium sulphite Nutrition 0.000 claims description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 5
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 5
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 5
- UJTPZISIAWDGFF-UHFFFAOYSA-N ethenylsulfonylbenzene Chemical compound C=CS(=O)(=O)C1=CC=CC=C1 UJTPZISIAWDGFF-UHFFFAOYSA-N 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 235000011054 acetic acid Nutrition 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 235000015110 jellies Nutrition 0.000 claims description 4
- 239000008274 jelly Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000003431 cross linking reagent Substances 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 11
- 239000010779 crude oil Substances 0.000 abstract 1
- -1 pH regulator Substances 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000000499 gel Substances 0.000 description 36
- 238000003756 stirring Methods 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 10
- 229920002401 polyacrylamide Polymers 0.000 description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 5
- 229910001424 calcium ion Inorganic materials 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 229910001425 magnesium ion Inorganic materials 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 229920002873 Polyethylenimine Polymers 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 229940018564 m-phenylenediamine Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 229920002866 paraformaldehyde Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- C09K8/5083—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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a temperature-resistant and salt-resistant profile control water plugging agent, and belongs to the technical field of chemical water plugging and profile control of oil fields in petroleum engineering. The temperature-resistant and salt-resistant profile control water shutoff agent comprises the following components: temperature-resistant polymer, water-soluble phenolic resin, reinforcing agent, pH regulator, heat stabilizer and water. The temperature-resistant and salt-resistant profile control water plugging agent provided by the invention has good thermal stability, can meet the plugging operation requirement of a high-temperature oil reservoir, and can remarkably improve the crude oil recovery rate.
Description
Technical Field
The invention belongs to the field of profile control and water shutoff of oil fields, and relates to a temperature-resistant salt-resistant profile control and water shutoff agent and a preparation method thereof.
Background
China is one of countries with a high proportion of water injection development oil fields in the world, the reserves for water drive account for more than 60% of the total reserves, and the water drive development oil field plays a significant role in oil development in China. As the water drive development enters the later stage, the invalid channeling of injected water along the large pore passage caused by the intensified heterogeneous reservoir stratum causes serious water drive development effect to further deteriorate, and a large amount of water is produced by an oil well, so that the stable production basis of the oil field becomes weak.
In the prior art, aiming at the problems of low efficiency and ineffective circulation of large-pore injected water, various researches on a plugging control system are developed in each oil field, and polymer gels are profile control water plugging agents which are used most at home and abroad and have the widest application. Among them, the polymer gel profile control agent having hydrolyzed polyacrylamide as a main agent is most used.
Such as: publication No. CN105860946A discloses a profile control and water shutoff system with controllable low-temperature gelling, which mainly comprises hydrolyzed polyacrylamide, paraformaldehyde, resorcinol and m-phenylenediamine.
The publication number CN106634907A discloses a polyethyleneimine profile enhancing and water plugging agent, which comprises partially hydrolyzed polyacrylamide, a crosslinking agent polyethyleneimine, a delayed gelling agent, a stabilizing agent and the like.
Publication No. CN 102816558A discloses a deep profile control water shutoff agent, which comprises the components of partially hydrolyzed polyacrylamide, potassium dichromate, sodium sulfite, hexamethylenetetramine, phenol and ammonium chloride.
The above-mentioned types of profile control agents have some drawbacks: 1. because the used hydrolyzed polyacrylamide anionic polymer generally has electronegativity in clay minerals in an oil reservoir, and the clay minerals have mutual repulsion, the formed gel is easy to desorb under the washing of injected water and loses the plugging effect; 2. after being dissolved, the common hydrolyzed polyacrylamide has high viscosity shear loss rate in the injection process, and the gelling performance and the strength are influenced; 3. the common hydrolyzed polyacrylamide has poor temperature resistance, the hydrolyzed polyacrylamide molecules can break chains and reduce viscosity at 100 ℃, and the gel has poor salt resistance and poor stability in a high-salt stratum.
Disclosure of Invention
The invention aims to provide a profile control water shutoff agent which can overcome the defects of the prior art, is resistant to temperature and salt, has high gelling strength and can be suitable for high-temperature oil reservoirs.
The purpose of the invention is realized by the following technical scheme: a temperature-resistant and salt-resistant profile control water shutoff agent is prepared from the following raw materials: based on the total mass of the raw materials, 0.15-0.75% of temperature-resistant polymer, 0.08-1% of water-soluble phenolic resin, 0.05-0.2% of reinforcing agent, 0.01-0.15% of pH regulator, 0.05-0.15% of heat stabilizer and the balance of water; the structural formula of the temperature-resistant polymer is as follows:
wherein x, y and z are polymerization degrees, and x: y: z is (11-25): (8-20): (2-15) viscosity average molecular weight 8X 10 6 ～1.2×10 7 。
The reinforcing agent is ammonium chloride.
The pH regulator is as follows: one or more of formic acid, acetic acid, oxalic acid and citric acid.
The heat stabilizer is as follows: one or a mixture of more of thiourea, sodium sulfite and sodium bisulfite.
The mass percent of the temperature-resistant polymer is 0.25% -0.65%, preferably 0.30% -0.55%; the molecular weight of the temperature-resistant polymer is 800-1200 ten thousand.
0.08-0.80% of water-soluble phenolic resin, preferably 0.10-0.60%; the mass percent of the reinforcing agent is 0.05-0.10%, preferably 0.06-0.08%; the pH regulator comprises the following components in percentage by mass: 0.01% -0.10%, preferably 0.02% -0.06%; the mass percentage of the heat stabilizer is 0.05-0.10%, preferably 0.05-0.08%.
The invention provides a preparation method of a temperature-resistant and salt-resistant profile control water shutoff agent, which comprises the following steps: preparing a temperature-resistant polymer aqueous solution, adding a water-soluble phenolic resin cross-linking agent, a heat stabilizer, a reinforcing agent and a pH regulator into the aqueous solution, and gelling to obtain the temperature-resistant salt-resistant jelly profile control water shutoff agent.
The gelling temperature is 120-180 ℃, and the gelling time is 8-240 h and can be adjusted.
The preparation method of the temperature-resistant polymer comprises the following steps: uniformly mixing three monomers of acrylamide, dimethyl diallyl ammonium chloride and phenyl vinyl sulfone in water, and adding an initiator for polymerization reaction to obtain a temperature-resistant polymer; the mass ratio of the acrylamide to the dimethyl diallyl ammonium chloride to the phenyl vinyl sulfone is (50-80): (30-50): (5-20).
The temperature-resistant and salt-resistant gel profile control water shutoff agent provided by the invention can be used at the temperature of not higher than 180 ℃ and the mineralization degree of not higher than 2.5 multiplied by 10 5 mg/L oil deposit, profile control and water shutoff.
The invention has the advantages that rigid groups are introduced into the molecular structure of the polymer, and the polymer has excellent temperature resistance. Meanwhile, the cationic group in the polymer can strongly react with negatively charged rocks, so that the effective period of plugging is prolonged, and in addition, the jelly has excellent salt resistance, so that the strength of the formed jelly is high, and the gelling time is controllable; the performance is stable under high mineralization degree.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the content of the present invention is not limited to the following examples.
Example 1
To 99.56g of deionized water, 0.25g of polymer was added
(wherein x: y: z is 11 6 ) Continuously stirring until the mixture is completely dissolved, then adding 0.08g of water-soluble phenolic resin, 0.05g of ammonium chloride, 0.01g of formic acid and 0.05g of thiourea to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 200h, the gel strength of the formed gel can reach grade F by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 2
To 97.75g of deionized water, 0.75g of polymer was added
(wherein x: y: z is 25 6 ) And continuously stirring until the mixture is completely dissolved, then adding 1.00g of water-soluble phenolic resin, 0.2g of ammonium chloride, 0.15g of oxalic acid and 0.15g of thiourea to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 8h, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 3
To 98.45g of deionized water, 0.65g of polymer was added
(wherein x: y: z is 25 6 ) Continuously stirring until the mixture is completely dissolved, then adding 0.60g of water-soluble phenolic resin, 0.1g of ammonium chloride, 0.10g of oxalic acid and 0.10g of thiourea to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 48h, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 4
To 99.47g of deionized water, 0.30g of polymer was added
(wherein x: y: z is 25 6 ) And continuously stirring until the mixture is completely dissolved, then adding 0.10G of water-soluble phenolic resin, 0.06G of ammonium chloride, 0.02G of acetic acid and 0.05G of sodium sulfite to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 190h, the gel strength of the formed gel can reach G grade by adopting an visual code method, and the formed gel is not dehydrated for 180 days.
Example 5
To 98.76g of deionized water, 0.45g of polymer was added
(wherein x: y: z is 5 7 ) Continuously stirring until the mixture is completely dissolved, then adding 0.60g of water-soluble phenolic resin, 0.07g of ammonium chloride, 0.04g of citric acid and 0.08g of sodium bisulfite to obtain the profile control water shutoff agent, wherein the gelling time of the system at 180 ℃ is 144h, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 6
The total mineralization at 97.75g was 2.5X 10 5 In mg/L saline (wherein the total of calcium ions and magnesium ions is 2X 10) 5 mg/L), 0.75g of polymer was added
(wherein x: y: z is 11 7 ) And continuously stirring until the mixture is completely dissolved, then adding 1.00g of water-soluble phenolic resin, 0.2g of ammonium chloride, 0.15g of oxalic acid and 0.15g of thiourea to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 24 hours, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 7
The total mineralization at 99.56g is 2.5X 10 5 In mg/L saline (wherein the total of calcium ions and magnesium ions is 2X 10) 5 mg/L), 0.25g of polymer was added
(wherein x: y: z is 20 7 ) And continuously stirring until the mixture is completely dissolved, then adding 0.08G of water-soluble phenolic resin, 0.05G of ammonium chloride, 0.01G of formic acid and 0.05G of thiourea to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 240h, the gel strength of the formed gel can reach G grade by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 8
The total degree of mineralization at 98.45g is 2.5X 10 5 In mg/L saline (wherein the total of calcium ions and magnesium ions is 2X 10) 5 mg/L), 0.65g of polymer was added
(wherein x: y: z is 23 6 ) And continuously stirring until the mixture is completely dissolved, then adding 0.60g of water-soluble phenolic resin, 0.1g of ammonium chloride, 0.10g of oxalic acid and 0.10g of thiourea to obtain the profile control water plugging agent, wherein the gelling time of the system at 180 ℃ is 73h, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the gel is not dehydrated within 180 days.
Example 9
The total mineralization at 99.47g is 2.5X 10 5 In mg/L saline (wherein the total of calcium ions and magnesium ions is 2X 10) 5 mg/L), 0.30g of polymer was added
(wherein x: y: z is 11 6 ) Continuously stirring until the mixture is completely dissolved, then adding 0.10g of water-soluble phenolic resin, 0.06g of ammonium chloride, 0.02g of acetic acid and 0.05g of sodium sulfite to obtain the profile control water plugging agent, wherein the system forms gel at 180 ℃ for 216h, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the formed gel is not dehydrated for 180 days.
Example 10
The total mineralization at 98.76g is 2.5X 10 5 In mg/L saline (wherein the total of calcium ions and magnesium ions is 2X 10) 5 mg/L), 0.45g of polymer was added
(wherein x: y: z is 25 7 ) Continuously stirring until the mixture is completely dissolved, then adding 0.60g of water-soluble phenolic resin, 0.07g of ammonium chloride, 0.04g of citric acid and 0.08g of sodium bisulfite to obtain the profile control water shutoff agent, wherein the gelling time of the system at 180 ℃ is 144h, the gel strength of the formed gel can reach grade I by adopting an visual code method, and the formed gel is not dehydrated for 180 days.
In the above embodiment, the temperature-resistant polymer is obtained by uniformly mixing three monomers of acrylamide, dimethyldiallylammonium chloride and phenyl vinyl sulfone in water, and adding an initiator for polymerization reaction.
Claims (10)
1. A temperature-resistant and salt-resistant profile control water shutoff agent is characterized by being prepared from the following raw materials: based on the total mass of the raw materials, 0.15-0.75% of temperature-resistant polymer, 0.08-1% of water-soluble phenolic resin, 0.05-0.2% of reinforcing agent, 0.01-0.15% of pH regulator, 0.05-0.15% of heat stabilizer and the balance of water; the structural formula of the temperature-resistant polymer is as follows:
wherein x, y and z are polymerization degrees, and x: y: z is (11-25): (8-20): (2-15) viscosity average molecular weight 8X 10 6 ～1.2×10 7 。
2. The temperature and salt resistant profile control water shutoff agent according to claim 1, wherein the reinforcing agent is ammonium chloride.
3. The temperature-resistant and salt-resistant profile control water shutoff agent according to claim 1, characterized in that the pH regulator is: one or more of formic acid, acetic acid, oxalic acid and citric acid.
4. The temperature-resistant and salt-resistant profile control water shutoff agent according to claim 1, which is characterized in that the heat stabilizer is: thiourea, sodium sulfite and sodium bisulfite or a mixture of a plurality of the thiourea, the sodium sulfite and the sodium bisulfite.
5. The temperature-resistant and salt-resistant profile control water shutoff agent according to claim 1, wherein the mass percent of the temperature-resistant polymer is 0.30-0.55%.
6. The temperature-resistant and salt-resistant profile control water shutoff agent according to claim 1, wherein the water-soluble phenolic resin is 0.10-0.60%; the mass percent of the reinforcing agent is 0.06% -0.08%; the pH regulator comprises the following components in percentage by mass: 0.02% -0.06%; the mass percentage of the heat stabilizer is 0.05-0.08%.
7. The preparation method of the temperature-resistant and salt-resistant profile control water shutoff agent according to claim 1, which is characterized by comprising the following steps: preparing a temperature-resistant polymer aqueous solution, adding a water-soluble phenolic resin cross-linking agent, a heat stabilizer, a reinforcing agent and a pH regulator into the aqueous solution, and gelling to obtain the temperature-resistant salt-resistant jelly profile control water shutoff agent.
8. The method for preparing the temperature-resistant and salt-resistant profile control water shutoff agent according to claim 7, wherein the gelling temperature is 120-180 ℃ and the gelling time is 8-240 h.
9. The preparation method of the temperature-resistant and salt-resistant profile control water shutoff agent according to claim 7, which is characterized in that the preparation method of the temperature-resistant polymer comprises the following steps: uniformly mixing three monomers of acrylamide, dimethyl diallyl ammonium chloride and phenyl vinyl sulfone in water, and adding an initiator for polymerization reaction to obtain a temperature-resistant polymer; the mass ratio of the acrylamide to the dimethyl diallyl ammonium chloride to the phenyl vinyl sulfone is (10-30): (6-25): (2 to 24).
10. The temperature-resistant and salt-resistant profile control water shutoff agent according to claim 1, which is characterized in that the temperature is not higher than 180 ℃ and the degree of mineralization is not higher than 2.5 x 10 5 The method is applied to the profile control and water shutoff of the oil reservoir of mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591092.8A CN112175595B (en) | 2019-07-02 | 2019-07-02 | Temperature-resistant and salt-resistant profile control water shutoff agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591092.8A CN112175595B (en) | 2019-07-02 | 2019-07-02 | Temperature-resistant and salt-resistant profile control water shutoff agent |
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| Publication Number | Publication Date |
|---|---|
| CN112175595A CN112175595A (en) | 2021-01-05 |
| CN112175595B true CN112175595B (en) | 2022-12-27 |
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| CN113249103B (en) * | 2021-06-01 | 2023-06-23 | 中国石油大学(华东) | A seawater-based polyacrylamide high temperature jelly profile control system |
| CN116004201A (en) * | 2021-10-21 | 2023-04-25 | 中国石油化工股份有限公司 | A high-temperature resistant production fluid sediment profile control and water shutoff agent and its preparation method |
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