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Stabilizer of delayed cross-linked polymer for plugging and profile control and preparation method thereof

A stabilizer and polymer technology, which is applied in the field of time-delayed polymer cross-linking stabilizer for plugging and its preparation, can solve the effect of profile control and water plugging, reduce the cross-linking degree of cross-linked polymers, and loose spatial network structure and other issues to achieve the effect of reducing the number of re-constructions and saving costs

Inactive Publication Date: 2017-03-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, after the cross-linked polymer system commonly used in oilfield profile control and water plugging is injected into the formation, because the polymer used in it is generally low in viscosity and low in molecular weight, once the polymer is degraded by the influence of temperature, the cross-linking of the cross-linked polymer At the same time, the formed spatial network structure is easy to loose, resulting in a decrease in crosslinking strength and stability time, which affects the effect of profile control and water shutoff

Method used

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preparation example Construction

[0037] The preparation method of the delayed polymer crosslinking stabilizer for plugging of the present invention comprises the following steps:

[0038] (a) prepare the aqueous solution A of chelation exchange agent;

[0039] (b) In aqueous solution A, under stirring, add complexation stabilizer and antioxidant successively, until forming uniform aqueous solution B;

[0040] (c) Add an acid-base balance agent to the aqueous solution B, control the stirring speed, and stir for at least 30 minutes to obtain the product.

[0041] In one embodiment of the present invention, the stirring speed in the above step is 800-6000 rpm; preferably 1000-4000 rpm, more preferably 2000-4000 rpm.

[0042] In the present invention, unless otherwise stated, all parts or percentages are parts or percentages by weight.

[0043] In the present invention, the substances used are all known substances, which can be purchased or synthesized by known methods.

[0044] In the present invention, the d...

Embodiment 1

[0048] (a) Add 0.05kg edetate disodium calcium to 100kg deionized water to prepare its aqueous solution A;

[0049] (b) In aqueous solution A, under 2000rpm stirring, add 1kg urea and 0.2kg thiourea successively, until forming uniform aqueous solution B;

[0050] (c) In the aqueous solution B, add 1 kg of bicarbonate, control the stirring speed at 1000 rpm, and stir for 30 minutes to obtain the product.

Embodiment 2

[0052] (a) Add 1kg calcium disodium edetate to 100kg deionized water to prepare its aqueous solution A;

[0053] (b) In aqueous solution A, under 2000rpm stirring, add 3kg urea and 2kg thiourea successively, until forming uniform aqueous solution B;

[0054] (c) In the aqueous solution B, add 1.5 kg of bicarbonate, control the stirring speed at 1000 rpm, and stir for 30 minutes to obtain the product.

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PUM

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Abstract

The invention relates to a stabilizer of a delayed cross-linked polymer for plugging and profile control. the stabilizer is composed of the following ingredients (by weight): 100 parts of water, 0.001-5 parts of a chelating exchanger EDTA calcium disodium, 0.5-10 parts of a complexing stabilizer urea, 0.01-6 parts of an antioxidant, and 0.5-8 parts of an acid-base equilibrium agent alkali metal salt. The invention also relates to a preparation method of the stabilizer of the delayed cross-linked polymer for plugging and profile control. By the use of the stabilizer of the cross-linked polymer for plugging and profile control, strength and stability of the cross-linking system are greatly enhanced.

Description

technical field [0001] The invention relates to a time-delayed polymer cross-linking stabilizer for plugging and a preparation method thereof. Background technique [0002] At present, after the cross-linked polymer system commonly used in oilfield profile control and water plugging is injected into the formation, because the polymer used in it is generally low in viscosity and low in molecular weight, once the polymer is degraded by the influence of temperature, the cross-linking of the cross-linked polymer At the same time, the formed spatial network structure is easy to loose, resulting in a decrease in cross-linking strength and stability time, which affects the effect of profile control and water shutoff. In order to improve the thermal stability of the polymer system used for plugging, improve the cross-linking effect of the cross-linking system, and increase the effective time of water plugging and profile control, a thermal stabilizer for the cross-linked polymer sys...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/512
CPCC09K8/035C09K8/512
Inventor 王涛胡秋平田玉芹靳彦欣杨圣贤辛爱渊付琛朱妍婷张冬会李福军
Owner CHINA PETROLEUM & CHEM CORP
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