CN113528103A - High-angle water channeling fracture profile control composition and high-angle water channeling fracture profile control agent - Google Patents
High-angle water channeling fracture profile control composition and high-angle water channeling fracture profile control agent Download PDFInfo
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- CN113528103A CN113528103A CN202010296222.8A CN202010296222A CN113528103A CN 113528103 A CN113528103 A CN 113528103A CN 202010296222 A CN202010296222 A CN 202010296222A CN 113528103 A CN113528103 A CN 113528103A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 147
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- 125000000129 anionic group Chemical group 0.000 claims description 20
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000005011 phenolic resin Substances 0.000 claims description 18
- 229920001568 phenolic resin Polymers 0.000 claims description 18
- 230000007062 hydrolysis Effects 0.000 claims description 13
- 238000006460 hydrolysis reaction Methods 0.000 claims description 13
- 229910021487 silica fume Inorganic materials 0.000 claims description 10
- -1 polyoxypropylene Polymers 0.000 claims description 8
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical group CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 7
- 239000005543 nano-size silicon particle Substances 0.000 claims description 6
- 229920001451 polypropylene glycol Polymers 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 150000001412 amines Chemical group 0.000 claims description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
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- 238000000034 method Methods 0.000 abstract description 4
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- 206010017076 Fracture Diseases 0.000 description 84
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- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 15
- 229910000280 sodium bentonite Inorganic materials 0.000 description 15
- 229940080314 sodium bentonite Drugs 0.000 description 15
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 12
- 239000000499 gel Substances 0.000 description 10
- 229910000281 calcium bentonite Inorganic materials 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
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- 238000012360 testing method Methods 0.000 description 7
- 235000015110 jellies Nutrition 0.000 description 5
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- 230000000694 effects Effects 0.000 description 4
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- 125000003368 amide group Chemical group 0.000 description 3
- 229940092782 bentonite Drugs 0.000 description 3
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- 239000003921 oil Substances 0.000 description 3
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- 239000005977 Ethylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract
The invention relates to a high-angle water channeling fracture profile control composition and a high-angle water channeling fracture profile control agent, and belongs to the technical field of profile control and water shutoff. The profile control composition comprises the following components in parts by weight: 0.4-0.6 part of polyacrylamide polymer, 0.3-0.5 part of cross-linking agent, 0.1-0.2 part of pH regulator and 1-2 parts of solid particle reinforcing agent. In the profile control composition, a polyacrylamide polymer and a cross-linking agent are subjected to chemical reaction under the action of a pH regulator to generate polymer gel with a stable three-dimensional network structure, and a solid particle reinforcing agent can not only enhance the strength of the three-dimensional network structure, but also improve the viscosity of the generated polymer gel, so that the fingering phenomenon cannot occur in a high-angle crack in the profile control process, the high-angle crack can be effectively filled with the solid particle reinforcing agent, the whole high-angle crack is blocked, and the problems of serious water channeling along the crack and difficult blocking of the high-angle crack of the injected water of a fractured compact reservoir are solved.
Description
Technical Field
The invention relates to a high-angle water channeling fracture profile control composition and a high-angle water channeling fracture profile control agent, and belongs to the technical field of profile control and water shutoff.
Background
Tight hypotonic reservoirs are subject to formation motion and the reservoir may squeeze or stretch, creating a large number of fractures, called high angle fractures, when the fracture angle is greater than 45 °. Under the influence of the fracture angle, when the density of the injection medium is greater than that of crude oil, the injection medium can be pointed along the bottom of the fracture, and when the density of the injection medium is less than that of the crude oil, the injection medium can be pointed along the top of the fracture. Therefore, the problem of serious water channeling often occurs in the process of water injection and energy supplement of the compact low-permeability fractured reservoir, injected water is in ineffective circulation in an oil-water well through high-angle fractures, and the water drive development effect is poor.
The profile control technology is an important technical measure for enlarging the wave and volume of injected water and improving the development effect of water flooding, and has been successfully applied to high-water-content oil fields at home and abroad. At present, most of chemical agents used in various profile control systems at home and abroad are polymer gel systems. For example, in the prior art, chinese patent document CN102559159A discloses a high temperature resistant phenolic resin weak gel profile control water shutoff agent, which is a profile control water shutoff agent formed by reacting partially hydrolyzed polyacrylamide with a cross-linking agent through an amide group thereof, wherein the profile control water shutoff agent comprises ethylene according to the following raw materials by mass percent: 0.25-1.2% of partially hydrolyzed polyacrylamide, 0.2-1% of cross-linking agent, 0.01-1% of additive and the balance of water; wherein the cross-linking agent is phenolic resin, and the additive is inorganic ammonium salt. The weak gel profile control water shutoff agent can realize deep profile control of an oil layer, but for an oil reservoir with high-angle fracture development, the profile control water shutoff agent is easy to finger into along the bottom of the fracture, and the upper part of the fracture cannot be filled with water, so that the high-angle fracture plugging effect is poor.
Disclosure of Invention
The invention aims to provide a profile control composition for high-angle water channeling cracks, which can solve the problem that the existing profile control agent has poor blocking effect on the high-angle water channeling cracks.
The invention also provides a profile control agent for the high-angle water channeling cracks, which can solve the problem that the existing profile control agent has poor blocking effect on the high-angle water channeling cracks.
In order to achieve the above object, the technical scheme adopted by the high-angle water channeling fracture profile control composition of the invention is as follows:
a high-angle water channeling fracture profile control composition comprises the following components in parts by weight: 0.4-0.6 part of polyacrylamide polymer, 0.3-0.5 part of cross-linking agent, 0.1-0.2 part of pH regulator and 1-2 parts of solid particle reinforcing agent.
The high-angle water channeling fracture profile control composition is suitable for a stratum at the temperature of 60-70 ℃, a polyacrylamide polymer and a cross-linking agent are subjected to chemical reaction under the action of a pH regulator at the temperature of the stratum to generate polymer jelly with a stable three-dimensional network structure, and a solid particle reinforcing agent can not only enhance the strength of the three-dimensional network structure, but also improve the viscosity of the generated polymer jelly, so that the fingering phenomenon cannot occur in high-angle fractures in the profile control process, the high-angle fractures can be effectively filled, the integral plugging of the high-angle fractures is realized, and the problems of serious water channeling of fractured compact reservoir water along the fractures and difficult plugging of the high-angle fractures are solved. The profile control agent prepared from the high-angle water channeling fracture profile control composition has the advantages of adjustable gelling time, high plugging strength and good long-term stability.
In order to reduce the cost, it is preferable that the polyacrylamide-based polymer is a polymer whose molecule contains the following repeating unit:
for example, the polyacrylamide polymer may be polyacrylamide, hydrophobically associating polyacrylamide, where polyacrylamide refers to one or any combination of nonionic polyacrylamide, anionic polyacrylamide, and cationic polyacrylamide. In order to ensure that the jelly meeting the viscosity requirement can be formed in a short time without increasing the cost too much, the polyacrylamide polymer is preferably anionic polyacrylamide. The molecular weight of the anionic polyacrylamide is 1500-1800 ten thousand. The degree of hydrolysis of the anionic polyacrylamide is 10-20%. The anionic polyacrylamide can meet the plugging requirement of a stratum with the temperature of 70 ℃ and the mineralization degree of 8-10 ten thousand milligrams per liter. More preferably, the degree of hydrolysis of the anionic polyacrylamide is 10 to 12%.
Of course, in order to improve the temperature resistance and salt resistance of the polyacrylamide polymer, some functional groups may be used to replace the hydrogen atoms bonded to the nitrogen atoms in the repeating units. The functional groupMay be methyl (-CH)3) Or ethyl (-C)2H5) And the like, and has the performance of increasing the stability of the polymer in high-temperature saline water or inhibiting the hydrolysis of the polymer in the high-temperature saline water.
Preferably, the solid particle reinforcing agent is a nano-micron grade solid particle, and the median particle diameter D50 is 30 nm-100 μm. Preferably, the solid particle reinforcing agent is bentonite and/or silica fume. The surfaces of the bentonite and the micro silicon powder are provided with hydroxyl groups, and hydrogen bonds can be formed between the hydroxyl groups and amide groups which are not bonded with the polymer, so that the strength of the formed polymer jelly is further enhanced. Generally, the finer the median particle size of the nano-micro particulate reinforcing agent, the better, but the smaller the particle size the higher the cost. For cost control, the solid particle reinforcing agent preferably has a median particle diameter D50 of 10 to 100 μm, for example, 10 to 50 μm. Preferably, the bentonite is sodium bentonite and/or calcium bentonite.
In order to optimize the gel forming time and gel forming strength, preferably, the pH adjuster is an amine-type pH adjuster, such as a polyamine compound. Further preferably, the amine-based pH adjuster is tetramethylethylenediamine and/or polyoxypropylene triamine. The pH regulator is used for promoting the crosslinking reaction of the partially hydrolyzed polyacrylamide and the crosslinking agent, and can greatly shorten the gelling time. The gel forming time can be adjusted by adjusting the dosage of the pH regulator within a given range.
Any cross-linking agent conventionally used as a cross-linking agent for polyacrylamide may be used as the cross-linking agent in the profile control composition of the present invention. Preferably, the crosslinking agent is a water-soluble phenolic resin crosslinking agent. The amide group of the polyacrylamide can remove one molecule of water with hydroxymethyl in the phenolic resin to form-CH2-NH-CO-groups, to effect crosslinking. The number of methylol functional groups in the phenolic resin is a factor affecting the crosslinking time, with a higher number of methylol groups reflecting an apparent higher phenolic resin viscosity. More preferably, the viscosity of the water-soluble phenolic resin is 3 to 10 mPas.
The polymer gel is susceptible to failure after longer plugging times due to the higher temperatures of the formation for high angle fractures. For extended high angle fracture plugging pot life, it is preferred that the above high angle water channeling fracture profile control composition further comprises a high temperature stabilizer. The high-temperature stabilizer is preferably nano silicon dioxide and/or nano zirconium oxide. The temperature resistance and salt tolerance of the profile control agent can be improved by using the nano silicon dioxide and/or the nano zirconia as the high-temperature stabilizer, so that the effective period of the profile control agent for plugging high-angle cracks is remarkably prolonged. Preferably, the mass ratio of the high-temperature stabilizer to the anionic polyacrylamide is 0.2-0.3: 0.4-0.6. The median particle diameter D50 of the high-temperature stabilizer is preferably 10-30 nm.
The high-angle water channeling fracture profile control agent adopts the technical scheme that:
a high-angle water channeling fracture profile control agent consists of water and the high-angle water channeling fracture profile control composition.
Compared with the prior art, the high-angle water channeling fracture profile control agent is added with the solid particle reinforcing agent, so that the strength of forming polymer gel can be increased, and the strength requirement of plugging a high-angle fracture for a long time can be met; the viscosity of the system can be adjusted, and the profile control agent is prevented from entering the bottom of the high-angle crack, so that the crack fullness is improved, and the high-angle crack is effectively blocked.
The profile control agent for the high-angle water channeling fracture can be prepared by the following method: taking each component of the water and high-angle water channeling fracture profile control composition, dissolving polyacrylamide polymer in water to prepare polyacrylamide solution, and then uniformly mixing the residual components of the high-angle fracture profile control agent with the polyacrylamide solution to obtain the high-angle water channeling fracture profile control composition.
When the high-angle water channeling fracture profile control agent is used, the profile control agent is prepared on a construction site and then injected into a stratum for profile control.
Preferably, the mass ratio of water to the high-angle water channeling fracture profile control composition is 96.4-98: 2-3.6. By controlling the mass ratio of water to the profile control composition within the above range, a profile control agent having a viscosity of 170 to 300mPa · s before gelling can be obtained, which satisfies both the injection requirement and the plugging requirement for filling the crack.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Examples of high Angle Water channeling Profile control compositions
The water-soluble phenolic resin used in the examples of the high-angle water channeling fracture profile control composition was a commercially available product from Shandongdawi Petroleum technology, Inc., having a viscosity of 5.5 mPas and a solid content of 30%; the anionic polyacrylamide is a product sold in Shandong Baomo biological chemical industry Co.
Example 1
The high-angle water channeling fracture profile control composition of the embodiment consists of the following components in parts by weight: 0.4 part of polyacrylamide polymer, 0.3 part of cross-linking agent, 0.1 part of pH regulator, 0.2 part of high-temperature stabilizer and 1 part of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1500 ten thousand, and the degree of hydrolysis is 20%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is tetramethylethylenediamine; the adopted high-temperature stabilizer is nano silicon dioxide, and the median particle size D50 is 10 nm; the solid particle reinforcing agent adopted is sodium bentonite, and the median particle diameter D50 is 10 mu m.
Example 2
The high-angle water channeling fracture profile control composition of the embodiment comprises the following components in parts by weight: 0.45 part of polyacrylamide polymer, 0.35 part of cross-linking agent, 0.15 part of pH regulator, 0.25 part of high-temperature stabilizer and 1.5 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1600 ten thousand, and the degree of hydrolysis is 15%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is polyoxypropylene triamine; the adopted high-temperature stabilizer is nano silicon dioxide, and the median particle size D50 is 15 nm; the solid particle reinforcing agent is calcium bentonite, and the median particle diameter D50 is 20 μm.
Example 3
The high-angle water channeling fracture profile control composition of the embodiment consists of the following components in parts by weight: 0.5 part of polyacrylamide polymer, 0.4 part of cross-linking agent, 0.2 part of pH regulator, 0.3 part of high-temperature stabilizer and 2 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1700 ten thousand, and the degree of hydrolysis is 12%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is tetramethylethylenediamine; the adopted high-temperature stabilizer is nano zirconia, and the median particle size D50 is 20 nm; the solid particle reinforcing agent is silica fume, and the median particle diameter D50 is 50 μm.
Example 4
The high-angle water channeling fracture profile control composition of the embodiment comprises the following components in parts by weight: 0.55 part of polyacrylamide polymer, 0.45 part of cross-linking agent, 0.15 part of pH regulator, 0.25 part of high-temperature stabilizer and 1.5 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1800 ten thousand, and the degree of hydrolysis is 10 percent; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is polyoxypropylene triamine; the adopted high-temperature stabilizer is nano zirconia, and the median particle size D50 is 30 nm; the solid particle reinforcing agent adopted is sodium bentonite, and the median particle diameter D50 is 100 mu m.
Example 5
The high-angle water channeling fracture profile control composition of the embodiment comprises the following components in parts by weight: 0.6 part of polyacrylamide polymer, 0.5 part of cross-linking agent, 0.2 part of pH regulator, 0.3 part of high-temperature stabilizer and 2 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1600 ten thousand, and the degree of hydrolysis is 15%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is tetramethylethylenediamine; the adopted high-temperature stabilizer is nano silicon dioxide, and the median particle size D50 is 20 nm; the adopted solid particle reinforcing agent is sodium bentonite and calcium bentonite, and the mass ratio of the sodium bentonite to the calcium bentonite is 1: 1; the median particle diameter D50 of the sodium bentonite was 50 μm, and the median particle diameter D50 of the calcium bentonite was 50 μm.
Example 6
The high-angle water channeling fracture profile control composition of the embodiment comprises the following components in parts by weight: 0.5 part of polyacrylamide polymer, 0.45 part of cross-linking agent, 0.15 part of pH regulator, 0.2 part of high-temperature stabilizer and 1.5 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1600 ten thousand, and the degree of hydrolysis is 15%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is tetramethylethylenediamine; the adopted high-temperature stabilizer is nano zirconia, and the median particle size D50 is 20 nm; the adopted solid particle reinforcing agent comprises sodium bentonite and silica fume, the mass ratio of the sodium bentonite to the silica fume is 1:0.5, the median particle diameter D50 of the sodium bentonite is 50 μm, and the median particle diameter D50 of the silica fume is 50 μm.
Example 7
The high-angle water channeling fracture profile control composition of the embodiment comprises the following components in parts by weight: 0.4 part of polyacrylamide polymer, 0.4 part of cross-linking agent, 0.2 part of pH regulator, 0.3 part of high-temperature stabilizer and 1 part of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1600 ten thousand, and the degree of hydrolysis is 15%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is polyoxypropylene triamine; the adopted high-temperature stabilizer is nano zirconia, and the median particle size D50 is 20 nm; the adopted solid particle reinforcing agent comprises sodium bentonite and silica micropowder, the mass ratio of the sodium bentonite to the silica micropowder is 1:1, the median particle diameter D50 of the sodium bentonite is 50 μm, and the median particle diameter D50 of the silica micropowder is 50 μm.
Example 8
The high-angle water channeling fracture profile control composition of the embodiment comprises the following components in parts by weight: 0.5 part of polyacrylamide polymer, 0.3 part of cross-linking agent, 0.15 part of pH regulator, 0.25 part of high-temperature stabilizer and 2 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1600 ten thousand, and the degree of hydrolysis is 15%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is polyoxypropylene triamine; the adopted high-temperature stabilizer is nano zirconia, and the median particle size D50 is 20 nm; the adopted solid particle reinforcing agents comprise sodium bentonite, calcium bentonite and silica fume, the mass ratio of the sodium bentonite to the calcium bentonite to the silica fume is 1:0.5:0.5, the median particle size D50 of the sodium bentonite is 50 mu m, the median particle size D50 of the calcium bentonite is 50 mu m, and the median particle size D50 of the silica fume is 50 mu m.
Example 9
The high-angle water channeling fracture profile control composition of the embodiment consists of the following components in parts by weight: 0.5 part of polyacrylamide polymer, 0.4 part of cross-linking agent, 0.2 part of pH regulator and 2 parts of solid particle reinforcing agent;
the adopted polyacrylamide polymer is anionic polyacrylamide, the molecular weight is 1700 ten thousand, and the degree of hydrolysis is 12%; the adopted cross-linking agent is water-soluble phenolic resin; the pH regulator is tetramethylethylenediamine; the solid particle reinforcing agent is silica fume, and the median particle diameter D50 is 50 μm.
Examples of high Angle Water channeling fracture Profile control Agents
Example 10
The high-angle water channeling fracture profile control agent of the embodiment consists of the high-angle water channeling fracture profile control composition of the embodiment 1 and water, and the mass ratio of the high-angle water channeling fracture profile control composition to the water is 2: 98.
The preparation method of the profile control agent for the high-angle water channeling fracture comprises the following steps:
1) adding water into a container, slowly adding partially hydrolyzed polyacrylamide under stirring, and stirring for 1h to fully dissolve the partially hydrolyzed polyacrylamide to obtain a partially hydrolyzed polyacrylamide solution;
2) and then sequentially adding a cross-linking agent, a pH regulator, a high-temperature stabilizer and a solid particle reinforcing agent into the partially hydrolyzed polyacrylamide solution, and uniformly stirring to obtain the high-angle water channeling fracture profile control agent.
Example 11
The high-angle water channeling fracture profile control agent of the embodiment consists of the high-angle water channeling fracture profile control composition of the embodiment 2 and water, and the mass ratio of the high-angle water channeling fracture profile control composition to the water is 2.7: 97.3.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 12
The high-angle water channeling profile control agent of the embodiment consists of the high-angle water channeling profile control composition of the embodiment 3 and water, and the mass ratio of the high-angle water channeling profile control composition to the water is 3.4: 96.6.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 13
The high-angle water channeling fracture profile control agent of the embodiment consists of the high-angle water channeling fracture profile control composition of the embodiment 4 and water, and the mass ratio of the high-angle water channeling fracture profile control composition to the water is 2.9: 97.1.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 14
The high-angle water channeling profile control agent of the embodiment consists of the high-angle water channeling profile control composition of the embodiment 5 and water, and the mass ratio of the high-angle water channeling profile control composition to the water is 3.6: 96.4.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 15
The high-angle water channeling profile control agent of the present example consists of the high-angle water channeling profile control composition of example 6 and water, and the mass ratio of the high-angle water channeling profile control composition to the water is 2.8: 97.2.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 16
The high-angle water channeling profile control agent of the present example consists of the high-angle water channeling profile control composition of example 7 and water, and the mass ratio of the high-angle water channeling profile control composition to the water is 2.3: 97.7.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 17
The high-angle water channeling profile control agent of the embodiment consists of the high-angle water channeling profile control composition of the embodiment 8 and water, and the mass ratio of the high-angle water channeling profile control composition to the water is 3.2: 96.8.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Example 18
The high-angle water channeling profile control agent of the embodiment consists of the high-angle water channeling profile control composition of the embodiment 9 and water, and the mass ratio of the high-angle water channeling profile control composition to the water is 3.1: 96.9.
The high angle water channeling fracture profile control agent of this example was prepared as in example 10.
Examples of the experiments
The following performance tests were performed on the high-angle water channeling fracture profile control agents of examples 10 to 18, respectively:
1) and (3) viscosity testing:
the viscosity of the high-angle water channeling fracture profile control agent prepared in examples 10 to 18 was measured by a rheometer, and the measurement results are shown in table 1.
2) And (3) testing the strength:
100g of the high-angle water channeling crack profile control agent obtained in the embodiment 10-18 is placed in a sample bottle and sealed, then the sample bottle is placed in a constant-temperature oven at 70 ℃ and aged for 72 hours to form a polymer gel plugging agent, an elasticity model test is carried out on the formed polymer gel plugging agent by using a rheometer, and the test results are shown in table 1.
3) And (3) testing the plugging performance:
the high-angle water channeling fracture profile control agents of examples 10 to 18 were injected into the vertically placed fracture models respectively by using advection pumps, the injection was stopped when the profile control agent flowed out of the outlet ends of the fracture models, and the fracture models were placed in a 70 ℃ constant temperature oven for aging for 72 hours after both ends were sealed. Then, the water flooding is continued until the pressure is stable, and the breakthrough pressure is tested, wherein the test result is shown in table 1.
4) And (3) stability testing:
respectively injecting the high-angle water channeling fracture profile control agent obtained in the embodiment 10-18 into a vertically placed fracture model by using a constant flow pump, stopping injecting after the profile control agent flows out of the outlet end of the fracture model, sealing two ends of the fracture model, and then placing the fracture model in a constant temperature oven at 70 ℃ for aging for 180 days. Then, the water flooding is continued until the pressure is stable, and the breakthrough pressure is tested, wherein the test result is shown in table 1.
TABLE 1 high Angle Water channeling fracture Profile control agent Performance test results
As can be seen from Table 1, the viscosity of the high-angle water channeling fracture profile control agent is 172-298mPa · s before gelling, so that the injection requirement and the plugging requirement of filling the fracture are met. The high-angle water channeling fracture profile control agent has the strength of 14.2-20Pa and is strong jelly glue. Particularly, after the high-temperature stabilizer is adopted, the bursting pressure gradient after the crack is plugged is more than 5MPa/m, and the strength requirement of crack plugging is met. The breakthrough pressure gradient is still larger than 4.5MPa after the temperature is kept for 180 days, the strength retention rate is more than 88 percent, and the profile control agent for the high-angle water channeling fracture has good stability.
Claims (10)
1. A high-angle water channeling fracture profile control composition is characterized in that: the paint comprises the following components in parts by weight: 0.4-0.6 part of polyacrylamide polymer, 0.3-0.5 part of cross-linking agent, 0.1-0.2 part of pH regulator and 1-2 parts of solid particle reinforcing agent.
2. The high angle water channeling fracture profile control composition of claim 1, wherein: the polyacrylamide polymer is anionic polyacrylamide; the molecular weight of the anionic polyacrylamide is 1500-1800 ten thousand, and the hydrolysis degree is 10-20%.
3. The high angle water channeling profile control composition according to claim 1 or 2, wherein: the solid particle reinforcing agent is bentonite and/or silica fume.
4. The high angle water channeling fracture profile control composition of claim 1, wherein: the pH regulator is amine pH regulator.
5. The high angle water channeling fracture profile control composition of claim 4, wherein: the amine pH regulator is tetramethylethylenediamine and/or polyoxypropylene triamine.
6. The high angle water channeling profile control composition according to claim 1 or 2, wherein: the cross-linking agent is a water-soluble phenolic resin cross-linking agent.
7. The high angle water channeling profile control composition according to claim 1 or 2, wherein: also comprises a high-temperature stabilizer; the high-temperature stabilizer is nano silicon dioxide and/or nano zirconium oxide.
8. The high angle water channeling fracture profile control composition of claim 7, wherein: the mass ratio of the high-temperature stabilizer to the anionic polyacrylamide is 0.2-0.3: 0.4-0.6.
9. A high-angle water channeling fracture profile control agent is characterized in that: consisting of water and the high angle water channeling profile control composition of claim 1.
10. The high angle water channeling fracture profile control agent as recited in claim 9, wherein: the mass ratio of water to the high-angle water channeling fracture profile control composition is 96.4-98: 2-3.6.
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| CN116042205A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Channeling sealing agent for oxygen reduction air flooding of fractured tight oil reservoir |
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Application publication date: 20211022 |