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Acrylamide copolymer, as well as preparation method and application thereof

A technology of acrylamide copolymer and acrylamide copolymerization, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve good viscosity-increasing effect, high molecular weight, and the effect of improving salt resistance

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

AI Technical Summary

Problems solved by technology

However, a study titled "High-temperature Hydrolysis of Water-Soluble AM / AA / AMPS Copolymer" (Zhu Linyong, Applied Chemistry, 2000, 17, 2) found that at a high temperature of 90 ° C, molecules adjacent to the acrylic acid (AA) unit With internal catalysis, the AMPS unit also undergoes hydrolysis reaction. Although the proportion of acrylic acid structural units in the copolymer increases with the hydrolysis reaction, which improves its temperature sensitivity and salt sensitivity performance, but because AMPS is prone to hydrolysis at high temperature, it is limited. The application of this type of polymer under high temperature and high salt conditions above the hydrolysis temperature

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

[0029]The present invention also provides a method for preparing an acrylamide copolymer, the method comprising: polymerizing a monomer mixture under solution polymerization conditions in the presence of an initiator; wherein, the monomer mixture contains the formula ( 5) The monomer with the structure shown in and the monomer with the structure shown in formula (6); based on the total moles of monomers in the monomer mixture, the content of the monomer with the structure shown in formula (5) is 30 -99 mol%, the content of the monomer with the structure shown in formula (6) is 1-70 mol%; preferably, the content of the monomer with the structure shown in formula (5) is 50-97.5 mol%, the formula (6) The monomer content of the shown structure is 2.5-50 mole %; the conditions of the solution polymerization reaction make the viscosity-average molecular weight of the polymer obtained after the polymerization reaction be 31 million-37 million, preferably 32 million-36 million,

[003...

Embodiment 1

[0080] This example is used to illustrate the acrylamide copolymer provided by the present invention and its preparation method.

[0081] (1) Preparation of monomers with structures shown in formula (6)

[0082] Add 1060 kg of acrylonitrile into a temperature-controlled glass reactor, add 200 kg of concentrated sulfuric acid with a concentration of 98% dropwise under stirring, cool the mixture to -5°C, and after stirring evenly, add α-methylbenzene dropwise Sodium ethylene sulfonate is 440 kg, and the temperature of the reaction system is maintained below 10°C. After reacting for 1 hour, add an appropriate amount of water, continue to react for 4 hours under normal temperature conditions, further adjust the pH value of the system with sodium hydroxide to be 7, obtain pure monomer through filtration, washing and drying, and the yield of the product is 93.9%. The monomer is the monomer of the structure shown in formula (6) (wherein, M 1 ’ and M 2 ’ are all sodium).

[0083]...

Embodiment 2

[0088] (1) Preparation of monomers with structures shown in formula (6)

[0089] Add 636 kg of acrylonitrile into the temperature-controlled glass reactor, add 107.8 kg of concentrated sulfuric acid with a concentration of 98% dropwise under stirring, cool the mixture to 5°C, and after stirring evenly, add α-methylstyrene dropwise Potassium sulfonate is 236 kg, and the temperature of the reaction system is maintained below 10°C. After reacting for 1 hour, add an appropriate amount of water, continue to react at normal temperature for 6 hours, adjust the pH value of the system to 7 with potassium hydroxide, obtain pure monomer through filtration, washing and drying, and the yield of the product is 95.5 %. The monomer is the monomer of the structure shown in formula (6) (wherein, M 1 ’ and M 2 ’ are all potassium).

[0090] (2) Preparation of acrylamide polymer

[0091] Add 1108.85 kilograms of acrylamide, 170 kilograms of monomers with the structure shown in formula (6) an...

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Abstract

The invention provides an acrylamide copolymer, as well as a preparation method and an application thereof. The acrylamide copolymer comprises a structural unit as shown in a formula (1) and a structural unit as shown in a formula (2), wherein R1 and R2 are respectively hydrogen or alkyl of C1-C4 independently, R3 is alkyl of C1-C8, and M1 and M2 are respectively at least one of hydrogen, potassium and sodium independently; based on the total mole number of the structural units in the acrylamide copolymer, the content of the structural unit as shown in the formula (1) is 30-99 molar percent, the content of the structural unit as shown in the formula (2) is 1-70 molar percent; and the viscosity-average molecular weight of the acrylamide copolymer is 31-37 millions. A temperature-resistance salt-resistance product prepared from 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. [0003] 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C09K8/588
Inventor 伊卓刘希方昭张文龙赵方园林蔚然祝纶宇杜超
Owner CHINA PETROLEUM & CHEM CORP
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