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Acrylamide copolymer, as well as preparation method and application thereof

An acrylamide-based, copolymer technology, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limited use of polymers and small molecular weight of products, and achieves low residual monomer content, high molecular weight, increased molecular weight, etc. The effect of relaxation time

Active Publication Date: 2015-05-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 the traditional polyacrylamide, but the obtained product molecular weight Small (no more than 20 million), making the use of polymers limited

Method used

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  • Acrylamide copolymer, as well as preparation method and application thereof
  • Acrylamide copolymer, as well as preparation method and application thereof
  • Acrylamide copolymer, as well as preparation method and application thereof

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preparation example Construction

[0033] The present invention also provides a method for preparing an acrylamide-based copolymer. The preparation 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 monomer mixture contains monomer E, monomer F and monomer G, the monomer E is a monomer having a structure shown in formula (9), and the monomer F is a monomer having a formula (10) - formula ( 13) At least one of the monomers with the structure shown in the formula (14), and the monomer E, the monomer F and the monomer G The mass ratio is 1: 0.001-3: 0.001-0.5, preferably 1: 0.01-1.5: 0.01-0.2; the solution polymerization conditions make the viscosity-average molecular weight of the polymer obtained after the polymerization reaction 30 million-35 million, Preferably 32 million-34 million,

[0034]

[0035] Among them, R 1 ’, R 2 ’, R 6 ’, R 7 ’, R 10 ’ and R 11 ' each independently hydro...

Embodiment 1

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

[0073] Add 1000 grams of acrylamide, 10 grams of 2-acrylamido-2-methylpropanesulfonic acid and 10 grams of silicon-containing surface-active functional monomers with the structure shown in formula (17), 4080 grams of deionized water, and stir In the state, the temperature of the solution was controlled at 5°C with frozen saline, and the pH was adjusted to 7 by adding sodium hydroxide. Transfer the monomer solution to the polymerization bottle, add 10.2 mg of 2,2'-azobisisobutylamidine dihydrochloride and 10.2 mg of N,N,N',N'-tetramethylethylenediamine, pass High-purity nitrogen was deoxygenated for 0.5 hour, 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 bottle began to heat up, and the reaction time was 8 hours. The colloid is taken out and granul...

Embodiment 2

[0077] This embodiment is used to illustrate the preparation method of the acrylamide copolymer provided by the present invention

[0078] Add 1,000 grams of acrylamide, 1,000 grams of 2-acrylamido-2-methylpropanesulfonic acid, 100 grams of silicon-containing surface-active functional monomers with the structure shown in formula (17), and 4,900 grams of deionized water in a beaker, stirring The temperature of the solution was controlled at 15°C with frozen brine, and the pH was adjusted to 7 by adding sodium hydroxide. Transfer the monomer solution to the polymerization bottle, add 1.05 grams of 2,2'-azobisisobutylamidine dihydrochloride and 1.05 grams of N,N,N',N'-tetramethylethylenediamine, and pass High-purity nitrogen was deoxygenated for 0.5 hour, 1.05 grams of sodium bisulfite and 1.05 grams of ammonium persulfate were added, and nitrogen was continued until the thermocouple in the polymerization bottle began to heat up, and the reaction time was 4 hours. The colloid is...

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Abstract

The invention provides an acrylamide copolymer, as well as a preparation method and an application thereof. The copolymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a unit having a structure as shown in a formula (1), the structural unit B is at least one unit having a structure as shown in formulae from (2) to (5), and the structural unit C is a unit having a structure as shown in a formula (6); the mass ratio of the structural unit A to structural unit B to structural unit C is 1:(0.001-3):(0.001-0.5); and the viscosity-average molecular weight of the acrylamide copolymer is 30-35 millions. A temperature-endurance salt-resistance product of the acrylamide copolymer has the characteristic of high molecular weight; and the acrylamide copolymer has an advantage of greatly thickening, and can be used as an oil-displacing agent for tertiary recovery of a high temperature and high salinity reservoir.

Description

technical field [0001] The invention relates to an acrylamide copolymer and its preparation method and application. Background technique [0002] Polymer flooding mainly injects a certain scale of polymer solution, increases the viscosity of the displacement fluid, and reduces the water phase permeability 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 improving the recovery. Rate. As the main polymer oil displacement agent, partially hydrolyzed polyacrylamide (HPAM) has been popularized and applied on a large scale in conventional oil reservoir EOB technology, and has played an important role in stabilizing and increasing oilfield production. With the reduction of reserves in conventional oil reservoirs, the application of HPAM in high-temperature and high-salt reservoirs faces many difficulties, mainly reflected in the combined effect of high temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F230/08C08F222/38C08F226/10C09K8/588
Inventor 伊卓张文龙林蔚然赵方园刘希方昭祝纶宇杜超
Owner CHINA PETROLEUM & CHEM CORP
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