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Cross-linked polymer system heat stabilizer for water shutoff and profile control, and preparation method and application thereof

A technology of cross-linked polymers and heat stabilizers, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the effects of profile control and water plugging, the reduction of cross-linking strength and stability time, and the difficulty of spatial network structure. Loose and other problems, to achieve the effect of reducing the number of re-construction and saving costs

Inactive Publication Date: 2013-05-22
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 in it will degrade under the influence of temperature, the formed spatial network structure is easy to loose, resulting in the decrease of cross-linking strength and stability time, making the adjustment The water blocking effect is affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Accurately weigh raw materials (kg): sodium thiosulfate 5; polyethylene glycol 40; urea 20; formaldehyde 3; deionized water 1000.

[0025] Preparation:

[0026] (a) adding thiourea or sodium thiosulfate to deionized water at room temperature, stirring evenly to prepare aqueous solution A;

[0027] (b) Weigh urea at room temperature and add to solution A, and stir evenly at 500 rpm to obtain solution B;

[0028] (c) Add polyethylene glycol to solution B at room temperature, and stir at a stirring speed of 1000 rpm to obtain solution C;

[0029] (d) Formaldehyde was added dropwise to solution C, and stirred and reacted for 90 minutes at a stirring speed of 1000 rpm to obtain the product.

Embodiment 2

[0031] Accurately weigh raw materials (kg): sodium thiosulfate 4; polyethylene glycol 36; urea 15; formaldehyde 2; deionized water 900.

[0032] Preparation:

[0033] (a) adding thiourea or sodium thiosulfate to deionized water at room temperature, stirring evenly to prepare aqueous solution A;

[0034] (b) Weigh urea at room temperature and add to solution A, stir evenly at 200 rpm to obtain solution B;

[0035] (c) Polyethylene glycol was added to solution B at room temperature, and stirred at a stirring speed of 800 rpm to obtain solution C;

[0036] (d) Formaldehyde was added dropwise to the solution C, and stirred and reacted for 60 minutes at a stirring speed of 500 rpm to obtain the product.

Embodiment 3

[0038] Accurately weigh raw materials (kg): sodium thiosulfate 6; polyethylene glycol 42; urea 25; formaldehyde 4; deionized water 1100.

[0039] Preparation:

[0040] (a) adding thiourea or sodium thiosulfate to deionized water at room temperature, stirring evenly to prepare aqueous solution A;

[0041] (b) Weigh urea at room temperature and add to solution A, and stir evenly at 500 rpm to obtain solution B;

[0042] (c) Add polyethylene glycol to solution B at room temperature, and stir at a stirring speed of 1000 rpm to obtain solution C;

[0043] (d) Formaldehyde was added dropwise to solution C, and stirred and reacted for 30 minutes at a stirring speed of 1000 rpm to obtain the product.

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PUM

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Abstract

The invention discloses a cross-linked polymer system heat stabilizer for water shutoff and profile control, and a preparation method and application thereof, wherein the heat stabilizer is composed of the following components in parts by weight: 2-8 parts of sodium thiosulfate, 30-50 parts of polyethylene glycol, 10-30 parts of urea, 1-5 parts of formaldehyde and 800-1200 parts of de-ionized water. All of the components are evenly mixed to obtain the heat stabilizer which is used as a cross-linked polymer system common in water shutoff and profile control or profile control and displacement of the oil field; and the cross-linked polymer system is composed of polyacrylamide aqueous solution and a phenolic resin cross-linking agent or organic chromium cross-linking agent. The thiourea or sodium thiosulfate of the heat stabilizer provided by the invention serves as the deoxidant, the polyethylene glycol or the urea serves as the complexing stabilizer, and the formaldehyde serves as the complexing stabilizer and the bactericide; the method for preparing the cross-linked polymer system heat stabilizer is simple and the use cost is also low; therefore, the strength and the stability of the cross-linked system both can be well improved.

Description

technical field [0001] The invention relates to an oilfield chemical agent and its preparation method and application, in particular to a cross-linked polymer system heat stabilizer for plugging and its preparation method and application. 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 in it will degrade under the influence of temperature, the formed spatial network structure is easy to loose, resulting in the decrease of cross-linking strength and stability time, making the adjustment The water blocking effect is affected. In order to improve the thermal stability of the cross-linked system, improve the cross-linking effect of the cross-linked system, and increase the effective time of water plugging and profile control, a thermal stabilizer for the cross-linked polymer system was invented. Invention content: [0003] The techni...

Claims

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Application Information

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IPC IPC(8): C08L33/26C08L71/08C08K5/405C08K3/30C08K5/07C08K5/21C09K8/44C09K8/588
Inventor 刘承杰胡秋平靳彦欣王涛韦雪李潇菲李福军徐鹏姜阿娜付琛
Owner CHINA PETROLEUM & CHEM CORP
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