Thickening agent for acid fracturing and preparation method thereof

A technology of acid fracturing and thickening agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that cannot fully meet the needs of deep well reservoir reconstruction, and achieve the effect of mild reaction conditions and meeting technical requirements

Pending Publication Date: 2020-06-09
克拉玛依中科恒信科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the current situation that the existing domestic deep acid fracturing fluid system cannot fully meet the deep well reservoir transformation under the high temperature and high pressure conditions of deep wells, the present invention provides a thickener with high temperature acid fracturing performance and corrosion resistance, With temperature resistance, salt resistance, shear resistance and corrosion resistance, it can meet the technical requirements of deep well reservoir stimulation under high temperature and high pressure conditions in deep wells

Method used

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  • Thickening agent for acid fracturing and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of thickener of the present invention is:

[0030] (1) Dissolve 2-acrylamide-2-methylpropanesulfonic acid in pure water, add NaOH, and adjust the pH value of the solution to 7; then acrylamide, N-vinylpyrrolidone, acetic acid and diethylenetriamine After dissolving in pure water, it can be miscible with 2-acrylamide-2-methylpropanesulfonic acid solution, add pure water and stir evenly to obtain standby solution Ⅰ; raw materials acrylamide, 2-acrylamide-2-methylpropanesulfonic acid , The weight ratio of N-vinylpyrrolidone, acetic acid and diethylenetriamine is 7:1:0.5:0.2:0.2;

[0031] (2) Take the spare solution I and inject it into the reaction container, under the protection of nitrogen, raise the temperature to 70°C, take ammonium persulfate and sodium bisulfite, add them to the spare solution I, continue to fill with nitrogen, airtight, and stir at 70°C 4.5h, the colloid was obtained; the weight ratio of ammonium persulfate to sodium bisulfit...

Embodiment 2

[0036] The preparation method of thickener of the present invention is:

[0037] (1) Dissolve 2-acrylamide-2-methylpropanesulfonic acid in pure water, add NaOH, and adjust the pH value of the solution to 7; then acrylamide, N-vinylpyrrolidone, acetic acid and diethylenetriamine After dissolving in pure water, it can be miscible with 2-acrylamide-2-methylpropanesulfonic acid solution, add pure water and stir evenly to obtain standby solution Ⅰ; raw materials acrylamide, 2-acrylamide-2-methylpropanesulfonic acid , The weight ratio of N-vinylpyrrolidone, acetic acid and diethylenetriamine is 7.5:3:1:0.4:0.4;

[0038] (2) Take the spare solution I and inject it into the reaction container, under the protection of nitrogen, heat up to 80°C, take ammonium persulfate and sodium bisulfite, add them to the spare solution I, and continue to fill with nitrogen, airtight, and stir at 80°C 3.5h, the colloid was obtained; the weight ratio of ammonium persulfate to sodium bisulfite was 1:1;...

Embodiment 3

[0043] The preparation method of thickener of the present invention is:

[0044] (1) Dissolve 2-acrylamide-2-methylpropanesulfonic acid in pure water, add NaOH, and adjust the pH value of the solution to 7; then acrylamide, N-vinylpyrrolidone, acetic acid and diethylenetriamine After dissolving in pure water, it can be miscible with 2-acrylamide-2-methylpropanesulfonic acid solution, add pure water and stir evenly to obtain standby solution Ⅰ; raw materials acrylamide, 2-acrylamide-2-methylpropanesulfonic acid , The weight ratio of N-vinylpyrrolidone, acetic acid and diethylenetriamine is 7.3:2:0.7:0.3:0.3;

[0045] (2) Take the spare solution I and inject it into the reaction container, under the protection of nitrogen, heat up to 75°C, take ammonium persulfate and sodium bisulfite, add them to the spare solution I, and continue to fill with nitrogen, airtight, and stir at 75°C 4h, the colloid was obtained; the weight ratio of ammonium persulfate to sodium bisulfite was 1:1;...

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Abstract

The invention relates to the technical field of petroleum, in particular to a thickening agent for acid fracturing and a preparation method thereof. The thickening agent is prepared by adding an initiator into raw materials including acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone, acetic acid and diethylenetriamine. The invention aims to solve the current situation thatthe existing domestic deep-layer acid fracturing fluid system cannot completely meet the requirement of deep-well reservoir transformation under the conditions of high temperature and high pressure of a deep well. The thickening agent provided by the invention has high-temperature acid fracturing performance and corrosion resistance, has temperature resistance, salt resistance, shearing resistance and corrosion resistance, and can meet the technical requirements of deep well reservoir reconstruction under the conditions of high temperature and high pressure of a deep well.

Description

technical field [0001] The invention relates to the field of petroleum technology, in particular to a thickener for acid fracturing and a preparation method thereof. Background technique [0002] With the improvement of my country's oil and gas resources development and exploration technology, the vertical development of oil and gas resources continues to deepen, the drilling depth is getting deeper and deeper, and the corresponding reservoir temperature is getting higher and higher, making development more and more difficult. The acidified fracturing fluid system puts forward higher requirements. Under the condition of high temperature and high pressure in deep wells, the existing deep acidification fracturing fluid system in China cannot fully meet the needs of deep well reservoir reconstruction, and the organic boron cross-linked fracturing fluid of the common vegetable gel thickener is only suitable for use at temperatures below 150°C At higher temperatures, the long cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/10C09K8/74
CPCC08F220/56C09K8/725C09K8/74
Inventor 杨鹏程祁红星石豫新
Owner 克拉玛依中科恒信科技有限责任公司
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