CN-121991285-A - Active polymer, preparation method thereof and profile control agent

Abstract

The application relates to an active polymer, a preparation method thereof and a profile control agent, and belongs to the technical field of oilfield profile control. The active polymer comprises a main body monomer and a hydrophobic association monomer, wherein the main body monomer is used as a basic framework structure of the active polymer, and the main body monomer is 20-30 parts by weight, and the hydrophobic association monomer is 14-23 parts by weight. The main body monomer is used as a basic skeleton structure of the active polymer; the main monomer and the hydrophobic association monomer can be polymerized to obtain the active polymer with hydrophobic association, the active polymer is associated with molecules in aqueous solution, the aqueous solution shows the characteristic of high viscosity on the macroscopic scale, and the hydrophobic group is introduced to the molecular chain of the active polymer, so that a multi-stage complex structure, namely a reversible solution space structure, is formed in the solution through the reversible association of weak non-covalent bond force, and the active polymer realizes the high-efficiency viscosity increasing of the aqueous solution.

Inventors

• CHEN XIAOKAI
• LIU JIAN
• QI YINGAN
• YANG JIE
• XIE JIAXI
• WANG XIAOHUI
• WANG HENG
• ZENG SHUANGHONG
• CHEN LEI
• MA CHANGMING
• LIU QIANG
• YANG KAI
• XI CHUNTING
• CHEN DANQI
• JIA XIAOMING
• XU BAOZHU

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (10)

1. 1. A living polymer, the living polymer comprising, as raw materials: The main body monomer is used as a basic framework structure of the active polymer, wherein the main body monomer comprises a main body monomer and a hydrophobic association monomer, wherein the main body monomer is used as a basic framework structure of the active polymer, 20-30 Parts of main body monomer and 14-23 parts of hydrophobic association monomer.
2. 2. The living polymer according to claim 1, wherein the hydrophobically associating monomer comprises a cationic hydrophobically associating monomer and a nonionic hydrophobically associating monomer.
3. 3. The living polymer according to claim 2, wherein the cationic hydrophobically associating monomer comprises at least one of alkyl dimethyl allyl ammonium chloride, cetyl dimethyl allyl ammonium chloride, and/or, The nonionic hydrophobically associating monomer comprises at least one of higher alcohol acrylate, higher alcohol methacrylate and N-alkyl acrylamide.
4. 4. A living polymer according to claim 2 or 3, wherein the weight ratio of the cationic hydrophobically associating monomer to the nonionic hydrophobically associating monomer is (10-15): 4-8.
5. 5. The living polymer according to claim 1, wherein the host monomer contains an acrylamide structural unit.
6. 6. The living polymer according to claim 1, wherein the starting material for the living polymer further comprises a sulfonic acid group-containing monomer.
7. 7. The living polymer according to claim 6, wherein the monomer containing sulfonic acid group comprises at least one of 2-acrylamido-2-methylpropanesulfonic acid, sodium acrylate.
8. 8. The living polymer according to claim 6 or 7, wherein the sulfonic acid group-containing monomer is 5 parts to 10 parts by weight.
9. 9. A method of preparing a living polymer according to any one of claims 1 to 8, the method comprising: Mixing the raw materials with a solvent to obtain a mixed solution; under the action of an initiator, the mixed solution is polymerized to obtain a living polymer, wherein, The technological parameters of the polymerization reaction comprise that the reaction pH is 6-7, and the reaction temperature is 45-60 ℃.
10. 10. A profile control agent, the profile control agent comprising the living polymer of any one of claims 1-8 as a raw material.

Description

Active polymer, preparation method thereof and profile control agent Technical Field The application relates to the technical field of oil field profile control, in particular to an active polymer, a preparation method thereof and a profile control agent. Background The thin oil, high-freezing oil and common heavy oil reservoirs of Liaohe oil field are commonly developed by water injection, the water flooding control reserves reach 10.19 hundred million tons, the water flooding control reserves enter the middle and later high water content stage of development, the water flooding, side water invasion or bottom water coning influence is caused, and the average comprehensive water content of the current deep flooding main force regulating block reaches 88%. At present, the water flooding development effect is improved by adopting technologies such as profile control, water shutoff, deep profile control, flooding and the like. The weak gel deep profile control technology is one of the most widely used deep profile control (driving) liquid flow steering technologies, and the more mature cross-linked polymer is mainly polyacrylamide and xanthan gum weak gel profile control technology. The polyacrylamide body weak gel profile control (flooding) agent is most widely applied to the current deep profile control liquid flow diversion treatment of high-water-content oil fields. The partially Hydrolyzed Polyacrylamide (HPAM) used in the polyacrylamide body weak gel profile control (flooding) agent can lead the solution viscosity loss rate to reach as high as 70 percent due to shearing chain scission, the HPAM can be degraded due to the increase of temperature, and in addition, the polymer viscosity is low due to the too high mineralization degree of stratum water, in particular to the influence of Ca 2+、Mg2+ divalent cations, and the polymer can be precipitated. In order to achieve improved fluidity ratio, the viscosity loss has to be compensated by increasing the use concentration of the polymer, and the increase of the chemical dosage increases the cost of profile control. Disclosure of Invention The application provides an active polymer, a preparation method thereof and a profile control agent, which are used for solving the technical problem of how to improve the tackifying performance of the polymer. In a first aspect, the present application provides a living polymer, the living polymer comprising: The main body monomer is used as a basic framework structure of the active polymer, wherein the main body monomer comprises a main body monomer and a hydrophobic association monomer, wherein the main body monomer is used as a basic framework structure of the active polymer, 20-30 Parts of main body monomer and 14-23 parts of hydrophobic association monomer. Optionally, the hydrophobically associating monomer comprises a cationic hydrophobically associating monomer and a nonionic hydrophobically associating monomer. Optionally, the cationic hydrophobically associating monomer comprises at least one of alkyl dimethyl allyl ammonium chloride, cetyl dimethyl allyl ammonium chloride, and/or, The nonionic hydrophobically associating monomer comprises at least one of higher alcohol acrylate, higher alcohol methacrylate and N-alkyl acrylamide. Optionally, the weight ratio of the cationic hydrophobic association monomer to the nonionic hydrophobic association monomer is (10-15): 4-8. Optionally, the host monomer contains an acrylamide building block. Optionally, the raw materials of the active polymer also comprise monomers containing sulfonic acid groups. Optionally, the monomer containing sulfonic acid group comprises at least one of 2-acrylamide-2-methylpropanesulfonic acid and sodium acrylate. Optionally, the monomer containing the sulfonic acid group is 5-10 parts by weight. In a second aspect, the present application provides a process for the preparation of a living polymer according to any one of the first aspects, the process comprising: Mixing the raw materials with a solvent to obtain a mixed solution; under the action of an initiator, the mixed solution is polymerized to obtain a living polymer, wherein, The technological parameters of the polymerization reaction comprise that the reaction pH is 6-7, and the reaction temperature is 45-60 ℃. In a third aspect, the present application provides a profile control agent, the profile control agent comprising a living polymer according to any one of the first aspects. Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: The active polymer provided by the embodiment of the application comprises a main body monomer and a hydrophobic association monomer, wherein the main body monomer is used as a basic framework structure of the active polymer, and the main body monomer is 20-30 parts by weight and the hydrophobic association monomer is 14-23 parts by weight. The main body monomer is used as a basic mon