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A functional temperature-resistant and salt-resistant plugging regulator and its preparation method

A temperature-resistant and salt-resistant, functional technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of affecting formation stability and validity period, affecting the final oil recovery factor of oilfields, and obtaining the overall performance of the gel. Guarantee, etc.

Inactive Publication Date: 2021-04-09
华鼎鸿基采油技术服务(北京)有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

In short, high temperature or high salt will make the overall performance of the gel not guaranteed, which will affect its stability and validity period in the formation, and affect the ultimate recovery of the oil field.

Method used

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  • A functional temperature-resistant and salt-resistant plugging regulator and its preparation method
  • A functional temperature-resistant and salt-resistant plugging regulator and its preparation method
  • A functional temperature-resistant and salt-resistant plugging regulator and its preparation method

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preparation example Construction

[0061] The present invention also provides a preparation method of the above-mentioned functional acrylamide prepolymer, comprising: mixing acrylamide, the compound represented by formula (A) and the compound represented by formula (B) in water, adding an initiator , after the reaction, it is hydrolyzed to obtain a functional acrylamide prepolymer; the mass ratio of the acrylamide, the compound described in formula (A) and the compound represented by formula (B) is (30-70): (17 ~38): (3~13);

[0062]

[0063] m is an integer from 1 to 5;

[0064] R 1 Alkyl group selected from C1~C3;

[0065] R 2 Selected from alkylsulfonate groups, the number of carbon atoms of the alkyl group in the alkylsulfonate group is 1-2;

[0066] R 3 Selected from alkyl alcohol hydroxyl groups, the number of carbon atoms of the alkyl group in the alkyl alcohol hydroxyl group is 1-3;

[0067] R 4 selected from alkyl carboxylate groups; the number of carbon atoms in the alkyl group in the alkyl...

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Abstract

The invention provides a functional temperature-resistant and salt-resistant plugging agent, comprising: a functional acrylamide prepolymer, a crosslinking agent, a stabilizer, a performance regulator, an oxygen scavenger and water; the functional acrylamide The quasi-prepolymer is shown in formula (I). The functional temperature-resistant and salt-resistant plugging agent of the present invention has low ground injection viscosity, controllable gelation time, high gelation strength and stable performance, excellent temperature-resistant and salt-resistant performance, and acts on high temperature (90-140°C) or high temperature Salt (40000‑260000mg·L ‑1 , Ca 2+ , Mg 2+ >3886mg·L ‑1 ) reservoirs, the effective stability period is long, and good plugging strength can be maintained for a long time without obvious signs of dehydration, which significantly improves the oilfield development effect and provides reliable technical support for the comprehensive management of precipitation and oil increase in high water-cut oilfields in my country .

Description

technical field [0001] The invention belongs to the technical field of enhanced oil recovery, and in particular relates to a functional temperature-resistant and salt-resistant plugging regulating agent and a preparation method thereof. Background technique [0002] In recent years, most oilfields in my country have been in the stage of high water cut and low output. The secondary pores produced by long-term water flooding have changed the rock framework structure, reduced the cement content, and increased the permeability by 10 to 15 times compared with the original permeability. Strong injection exacerbates this contradiction, even if the radius of plugging treatment is enlarged, the application effect will be significantly worse. At the same time, excessive water production has also caused a series of problems such as a decrease in oil well production, an increase in the cost of producing liquid treatment, excessive energy consumption, corrosion of wellbore pipelines, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/02C09K8/512
CPCC08F220/56C09K8/512C09K8/887C08F220/585C08F226/02
Inventor 张宁郭晓光杨雪张久海
Owner 华鼎鸿基采油技术服务(北京)有限公司
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