Acrylamide copolymer and its preparation method and use

A technology of acrylamide copolymer and acrylamide copolymerization, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of polymer use restrictions, small molecular weight of products, etc., and achieve low residual monomer content and high molecular weight , the effect of improving the viscoelasticity of the solution

Active Publication Date: 2015-05-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymers obtained by the above two methods have their own characteristics, and some properties such as temperature resistance, salt resistance, shear resistance and surface activity are indeed improved compared with traditional polyacrylamide, but the obtained products Small molecular weight (less than 20 million), resulting in limited use of the polymer

Method used

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  • Acrylamide copolymer and its preparation method and use
  • Acrylamide copolymer and its preparation method and use
  • Acrylamide copolymer and its preparation method and use

Examples

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preparation example Construction

[0030] The present invention also provides a method for preparing an acrylamide copolymer. The method includes the following steps. Under solution polymerization conditions and in the presence of an initiator, a monomer mixture is polymerized in water, wherein the The monomer mixture contains monomer E, monomer F, and monomer G. The monomer E is a monomer having a structure represented by formula (8), and the monomer F is a monomer having formula (9) to formula (12) At least one of the monomers of the structure shown, the monomer G is a monomer having the structure shown in formula (13), and the quality of the monomer E, the monomer F, and the monomer G The ratio is 1:0.001-3:0.001-0.5, preferably 1:0.01-1.5:0.01-0.2; the solution polymerization reaction conditions are such that the viscosity average molecular weight of the polymer obtained after the polymerization reaction is 27 million to 32 million, preferably 29 million-31 million,

[0031]

[0032] Where R 1 ’, R 2 ’, R 6 ’...

Embodiment 1

[0067] This example is used to illustrate the preparation method of acrylamide copolymer provided by the present invention

[0068] In the beaker, add 1000 grams of acrylamide, 10 grams of 2-acrylamido-2-methylpropanesulfonic acid, 10 grams of surface active functional monomer (n' is 10) and 4080 grams of the structure shown in formula (15) Deionized water, while stirring, use chilled brine to control the temperature of the solution to 5°C, and add sodium hydroxide to adjust the pH to 7. Transfer the monomer solution to a polymerization bottle, add 10.2 mg of 2,2'-azobisisobutylamidine dihydrochloride and 10.2 mg of N,N,N',N'-tetramethylethylenediamine. The high-purity nitrogen was deoxygenated for 0.5 hours, 10.2 mg of sodium bisulfite and 10.2 mg of ammonium persulfate were added, and nitrogen was continued until the thermocouple in the polymerization flask began to heat up, and the reaction time was 8 hours. The colloid is taken out and granulated into 4-6 mm copolymer colloi...

Embodiment 2

[0072] This example is used to illustrate the preparation method of acrylamide copolymer provided by the present invention

[0073] Add 1000 grams of acrylamide, 1000 grams of 2-acrylamido-2-methylpropanesulfonic acid, 100 grams of surface active functional monomer (n' is 10) and 4900 grams of the structure shown in formula (15) into the beaker Deionized water, while stirring, use chilled brine to control the temperature of the solution to 15°C, and add sodium hydroxide to adjust the pH to 7. Transfer the monomer solution to a polymerization bottle, add 1.05 g of 2,2'-azobisisobutylamidine dihydrochloride and 1.05 g of N,N,N',N'-tetramethylethylenediamine. The high-purity nitrogen gas was deoxygenated for 0.5 hours, and 1.05 g of sodium bisulfite and 1.05 g of ammonium persulfate were added, and the nitrogen was continued to flow until the thermocouple in the polymerization flask began to heat up, and the reaction time was 4 hours. The colloid is taken out and granulated into 4-...

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Abstract

The invention discloses an acrylamide copolymer. The acrylamide copolymer contains a structural unit A, a structural unit B and a structural unit C. The structural unit A has a structure shown in the formula (1). The structural unit B has at least one structure shown in the formulas (1), (2), (3), (4) or (5). The structural unit C has a structure shown in the formula (6). A mass ratio of the structural unit A, B to C is 1: 0.001-3: 0.001-0.5. The viscosity-average molecular weight of the acrylamide copolymer is in a range of 27 million to 32 million. The acrylamide copolymer has high molecular weight and apparent viscosity and can be used as a high-temperature high-salt oil reservoir tertiary recovery oil displacement agent.

Description

Technical field [0001] The invention relates to an acrylamide copolymer and its preparation method and application. Background technique [0002] Polymer flooding is mainly through injecting a certain scale of polymer solution to increase the viscosity of the displacement fluid and reduce the permeability of the water phase of the oil layer to reduce the mobility ratio and adjust the water absorption profile to achieve the purpose of increasing the volume of the displacement phase, thereby increasing recovery. rate. As the main polymer oil displacing agent, partially hydrolyzed polyacrylamide (HPAM) has been widely promoted and applied in conventional oil reservoir tertiary oil recovery (EOB) technology, which has played an important role in stabilizing and increasing oilfield production. With the reduction of conventional oil reservoir reserves, high-temperature and high-salt oil reservoirs make the application of HPAM face many problems, which are mainly reflected in the combi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/58C08F222/38C08F226/10C08F220/06C08F8/12C09K8/588
Inventor 伊卓张文龙赵方园林蔚然祝纶宇杜超刘希方昭
Owner CHINA PETROLEUM & CHEM CORP
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