Preparation method of heat-resistance and salt-tolerance anionic polyacrylamide for oil displacement

A polyacrylamide, anionic technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems that the temperature resistance and salt resistance can not meet the requirements of tertiary oil recovery, the preparation process or method is complicated, etc. Chain growth, precise and controllable hydrolysis reaction, stable reaction effect

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the polymer preparation process or method in the prior art is relatively complicated, and the temperature-resistan...

Method used

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  • Preparation method of heat-resistance and salt-tolerance anionic polyacrylamide for oil displacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] First add 125g of acrylamide (AM) into 352g of deionized water, stir and dissolve evenly, adjust the pH value to 8 with 5% NaOH solution, and cool the water bath to 15°C, then start to pass high-purity nitrogen gas into it. After nitrogen for 30 min, 10 g of 1.25% aqueous urea solution, 10 g of 0.9% disodium ethylenediaminetetraacetic acid (EDTA-disodium) aqueous solution, 1 g of 1.25% N,N-dimethylaminoethyl methacrylate (DMAEMA) aqueous solution were added successively, 1.25% potassium persulfate aqueous solution 1g, 1% sodium bisulfite aqueous solution 1g, after 1 hour, the reaction temperature was gradually raised to 40 ° C, after 4 hours of reaction, a gel-like polymer product was obtained, after cutting the gel, add 10% NaOH aqueous solution 140g, hydrolyzed at 90°C for 2 hours, then vacuum-dried at 75°C for 6h, crushed and sieved with a pulverizer, then sampled for analysis.

[0014] According to GB / T12005.2-89 polyacrylamide solid content determination method, th...

Embodiment 2

[0016] First add 125g of acrylamide (AM) into 370g of deionized water, stir and dissolve evenly, adjust the pH value to 8 with 5% NaOH solution, and cool the water bath to 15°C, then start to pass high-purity nitrogen gas into it. After nitrogen for 30 min, add 1.25% thiourea aqueous solution 1g, 0.81% ethylenediaminetetraacetic acid disodium (EDTA-disodium) aqueous solution 1g, 125% β-dimethylaminopropionitrile aqueous solution 1g, 1.25% sodium persulfate aqueous solution 1g, 1g of 1.69% potassium sulfite aqueous solution, after 1 hour, the reaction temperature was gradually raised to 40°C, and after 4 hours of reaction, a gel-like polymer product was obtained. After the gel was cut, 140g of 10% NaOH aqueous solution was added, and the reaction was hydrolyzed at 90°C for 2 hours, then vacuum-dried at 75°C for 6 hours, crushed and sieved with a pulverizer, and then sampled for analysis.

[0017]According to GB / T12005.2-89 polyacrylamide solid content determination method, the ...

Embodiment 3

[0019] First add 125g of acrylamide (AM) into 370g of deionized water, stir and dissolve evenly, adjust the pH value to 8 with 5% NaOH solution, and cool the water bath to 15°C, then start to pass high-purity nitrogen gas into it. After nitrogen for 30min, add 1.38% urea aqueous solution 1g, 0.33% ethylenediaminetetraacetic acid disodium (EDTA-disodium) aqueous solution 1g, 0.99% N, N-dimethyl diallyl ammonium chloride aqueous solution 1g, 1.25 % ammonium persulfate aqueous solution 1g, 2.63% potassium sulfite aqueous solution 1g, after 1 hour, the reaction temperature was gradually raised to 40°C, and after 4 hours of reaction, a gel-like polymer product was obtained, and 140g of 10% NaOH aqueous solution was added after cutting the glue, It was hydrolyzed at 90°C for 2 hours, then vacuum-dried at 75°C for 6 hours, crushed and sieved with a pulverizer, and then sampled for analysis.

[0020] According to GB / T12005.2-89 polyacrylamide solid content determination method, the so...

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Abstract

The invention relates to a preparation method of heat-resistance and salt-tolerance anionic polyacrylamide for oil displacement and mainly solves the problems of low molecular weight and poor heat resistance as well as salt tolerance of polymers in the prior art. With the combination of a complex initiation system composition and a post-hydrolysis technology, the method provided by the invention comprises the following steps of: carrying out aqueous solution polymerization on acrylamide, crushing gel slug, mixing with a certain concentration of alkali lye for hydrolysis reaction, drying and crushing to obtain fine granular anionic polyacrylamide. The technical scheme greatly solves the problems and can be used in the industrial production of heat-resistance and salt-tolerance anionic polyacrylamide for oil displacement.

Description

technical field [0001] The invention relates to a preparation method of temperature-resistant and salt-resistant anionic polyacrylamide for oil displacement. Background technique [0002] With the rapid development of the world economy, the demand for energy, especially oil, continues to increase. Therefore, enhanced oil recovery (EOR) in oil fields has increasingly become an important part of the international oil companies' business planning. [0003] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Tertiary oil recovery refers to the development method of tailings oil recovery using new physical, chemical and biological technologies after using natural energy for mining and traditional artificial energy supplementation (water injection, gas injection). Mainly through the injection of chemical substances, steam, gas (misci...

Claims

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Application Information

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IPC IPC(8): C08F20/56C08F8/12C08F4/00C09K8/588
Inventor 夏燕敏宋晓芳陈安猛蔡红
Owner CHINA PETROLEUM & CHEM CORP
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