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Heat-resistant and salt-resistant polymer thickening agent and preparation method thereof

A temperature-resistant, salt-resistant and thickener technology, applied in the field of polymers, can solve the problems of sewage solution stability, inability to adapt to temperature resistance of 90°C, and decline in temperature-resistant and salt-resistant performance, and achieves uncompromising synthesis conditions and high production efficiency. High efficiency and improved stability

Active Publication Date: 2011-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance evaluation results show that the effect is better than HPAM only in low-temperature and low-salt environments. The main problems include: ① solubility problems caused by hydrophobic groups; ② temperature and salt resistance due to intramolecular association problems; ③solution injection problems; ④sewage solution stability problems
[0009] However, the existing oil displacement polymers, including HPAM series products and MO series polymers, cannot meet the requirements of Type II and III oil reservoirs with a temperature resistance of 90°C, a salt resistance of 30,000 mg / L, and a divalent ion resistance of 800 mg / L.

Method used

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  • Heat-resistant and salt-resistant polymer thickening agent and preparation method thereof
  • Heat-resistant and salt-resistant polymer thickening agent and preparation method thereof
  • Heat-resistant and salt-resistant polymer thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 180 parts by mass of acrylamide (AM) and 20 parts of N-acetoxymaleimide shown in structural formula 1 were dissolved in 1000 parts of water under stirring.

[0034] [Structural formula 1]

[0035]

[0036] At room temperature, the aqueous solution was purged with nitrogen gas for 30 minutes, then the pH value of the solution was adjusted to 9.2, and 0.02 parts of initiator 2,2-azobis(2-methylpropionamidine) hydrochloride (AIBA) was added under stirring. React at a constant temperature of 60° C. under normal pressure for 6 hours to obtain a colloidal polymer solution product. The product is dried, granulated and pulverized to obtain a heat-resistant and salt-resistant thickener product.

Embodiment 2

[0038] 120 parts by mass of acrylamide (AM), 60 parts of acrylic acid and 20 parts of N-hydroxymaleimide shown in structural formula 2 were dissolved in 1000 parts of water under stirring.

[0039] [Structural formula 2]

[0040]

[0041] At room temperature, after 30 minutes of deoxygenating the aqueous solution with nitrogen, adjust the pH value of the solution to 9, add 0.01 part of ammonium persulfate and 0.01 part of sodium bisulfite under stirring as a redox initiator system, and react at a constant temperature of 30 ° C under normal pressure After 7 hours, a gummy polymer solution product was obtained. The product is dried, granulated and pulverized to obtain a heat-resistant and salt-resistant thickener product.

Embodiment 3

[0043] 150 parts by mass of acrylamide (AM), 100 parts of N-vinylpyrrolidone (NVP) and 20 parts of N-ethylsulfonate sodium maleimide shown in structural formula 3 were dissolved under stirring In 1000 parts of water.

[0044] [Structural formula 3]

[0045]

[0046]At room temperature, after deoxygenating the aqueous solution with nitrogen gas for 30 minutes, adjust the pH value of the solution to 8.9 and add 0.015 parts of initiator 2,2-azobis(2-methylpropionamidine) hydrochloride (AIBA) under stirring. The reaction was carried out at a constant temperature of 50° C. under normal pressure for 6 hours to obtain a colloidal polymer solution product. The product is dried, granulated and pulverized to obtain a heat-resistant and salt-resistant thickener product.

[0047] Thickener product performance test

[0048] Comparing the performance of the obtained temperature-resistant and salt-resistant thickener product with traditional polyacrylamide under the same conditions, th...

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Abstract

The invention relates to a heat-resistant and salt-resistant polymer thickening agent and a preparation method thereof. The thickening agent is generated by copolymerization of water-soluble compound with olefin groups and maleimide compound. The thickening agent has high viscosity in water body with high mineralized degree and positive divalent ion concentration and has better viscosity maintaining performance under the conditions of high temperature, high shear strength and high shear frequency, thus meeting the technical requirements for the thickening agent under the conditions of high temperature and high salinity in tertiary oil recovery at present, and improving the recovery ratio of a II or III type of oil reservoir in the tertiary oil recovery.

Description

technical field [0001] The invention relates to a polymer, in particular to a polymer used as a thickener for tertiary oil recovery fluid for enhancing oil recovery and a preparation method thereof. Background technique [0002] Tertiary oil recovery is one of the main measures to enhance oil recovery, among which polymer flooding plays an important role. At present, the polymer used in EOR is mainly partially hydrolyzed polyacrylamide (HPAM). As my country's major oilfields enter the late stage of water flooding and begin to produce reserves of low-grade oil reservoirs, new situations and new problems have emerged in the use of polymers for oil displacement, and new requirements have also been put forward for their research and development and application. [0003] Type II and III oil reservoir resources, which account for more than half of the total resources, have a formation temperature of 70-95°C, a formation salinity of 10,000-30,000 mg / L, and a divalent ion of 800 mg...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F220/56C08F222/40C08F220/06C08F226/10C08F220/54
Inventor 祝纶宇李勇魏小林杜凯计文希刘晓光伊卓赵方园
Owner CHINA PETROLEUM & CHEM CORP
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