Composition for water shutoff and profile control, water-shutoff profile-control agent containing same and preparation methods

A technology of water plugging profile control and water profile control agent, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature and salt resistance, limited application, environmental pollution, etc., achieve complete reaction, improve Conversion rate, source-rich effects

Active Publication Date: 2014-01-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional polyacrylamide water shutoff and profile control agent has limited its application in oilfield plugging adjustment operations due to its poor temperature and salt resistance, easy degradation, and damage to formations and oil layers to varying degrees.
In recent years, the emergence of various cross-linked polyacrylamide systems and various polyacrylamide graft copolymers has improved the temperature resistance and salt resistance of polyacrylamide to a certain extent, but the inorganic cross-linking agent used Such as chromium salts, aluminum salts, etc. and organic crosslinking agents such as phenol, thiourea, etc., will cause different degrees of pollution to the environment

Method used

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  • Composition for water shutoff and profile control, water-shutoff profile-control agent containing same and preparation methods
  • Composition for water shutoff and profile control, water-shutoff profile-control agent containing same and preparation methods

Examples

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Embodiment 1

[0044]This embodiment provides a composition for water plugging and profile modification. In terms of weight percentage, its raw material composition includes: 3% corn starch, 6% acrylamide, 0.4% composite initiator, 0.8% sodium hydroxide and the balance of water ; Wherein said composite initiator is mixed with mass ratio 1:1 by the hydrogen peroxide of ammonium persulfate composite initiator and mass concentration 50%, and described ammonium persulfate composite initiator comprises the ammonium persulfate that mass ratio is 1:3 and urea.

[0045] The preparation method of the composition for water plugging and profile control comprises the following steps:

[0046] Dissolving cornstarch in water with 60% of the total weight of raw material water to obtain an aqueous solution of cornstarch;

[0047] dissolving acrylamide in water with a total weight of 20% of the raw material water to obtain an aqueous solution of acrylamide;

[0048] The composite initiator is mixed with th...

Embodiment 2

[0055] This embodiment provides a composition for water plugging and profile modification. In terms of weight percentage, its raw material composition includes: 4% corn starch, 7% acrylamide, 0.8% composite initiator, 1% sodium hydroxide and the balance of water ; Wherein said composite initiator is mixed with mass ratio 1:3 by the hydrogen peroxide of ammonium persulfate composite initiator and mass concentration 50%, and described ammonium persulfate composite initiator comprises the ammonium persulfate that mass ratio is 1:3 and urea.

[0056] The preparation method of the composition for water plugging and profile control comprises the following steps:

[0057] Dissolving cornstarch in water with 60% of the total weight of raw material water to obtain an aqueous solution of cornstarch;

[0058] dissolving acrylamide in water with a total weight of 20% of the raw material water to obtain an aqueous solution of acrylamide;

[0059] The composite initiator is mixed with the...

Embodiment 3

[0066] This embodiment provides a composition for water plugging and profile modification. In terms of weight percentage, its raw material composition includes: 3.5% corn starch, 6.5% acrylamide, 0.6% composite initiator, 0.9% sodium hydroxide and water balance ; Wherein said composite initiator is mixed with mass ratio 1:2 by ammonium persulfate composite initiator and the hydrogen peroxide of mass concentration 50%, and described ammonium persulfate composite initiator comprises the ammonium persulfate that mass ratio is 1:3 and urea.

[0067] The preparation method of the composition for water plugging and profile control comprises the following steps:

[0068] Dissolving cornstarch in water with 60% of the total weight of raw material water to obtain an aqueous solution of cornstarch;

[0069] dissolving acrylamide in water with a total weight of 20% of the raw material water to obtain an aqueous solution of acrylamide;

[0070] The composite initiator is mixed with the ...

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Abstract

The invention provides a composition for water shutoff and profile control, a water-shutoff profile-control agent containing same and preparation methods of the composition and the agent. The composition for water shutoff and profile control comprises the raw materials in percents by weight: 3-4% of a starch matrix, 6-7% of acrylamide, 0.4-0.8% of a composite initiator, 0.8-1.0% of sodium hydroxide and the balance water. The preparation method of the composition for water shutoff and profile control comprises: polymerizing starch matrix and acrylamide under the effect of the composite initiator, and hydrolyzing the obtained polymer under the effect of sodium hydroxide to obtain the composition for water shutoff and profile control. The water-shutoff profile-control agent comprises the raw materials: the composition for water shutoff and profile control and phenolic resin. The preparation method of the water-shutoff profile-control agent comprises: uniformly mixing the composition for water shutoff and profile control and phenolic resin and reacting to obtain the water-shutoff profile-control agent. The composition and the water-shutoff profile-control agent containing the composition have the characteristics of salt tolerance, heatproofness, no environmental pollution and the like.

Description

technical field [0001] The invention relates to a composition for water plugging and profile control and a preparation method thereof, as well as a water plugging and profile control agent containing the composition and a preparation method thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] With the continuous development of water flooding oilfields in my country, the comprehensive water content of oilfields is also increasing. At present, the average water content of oil wells has reached more than 80%, which makes water plugging and profile control operations face many problems, and plugging adjustment is becoming more and more difficult. [0003] The traditional polyacrylamide water shutoff and profile control agent has limited its application in oilfield plugging adjustment operations because of its poor temperature and salt resistance, easy degradation, and damage to formations and oil layers to varying degrees. In recent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C09K8/588C08F251/00C08F220/56C08F8/12
CPCC08F251/00C09K8/5045C09K8/5083C09K8/512C09K8/514C08F220/56
Inventor 张洪君王浩郑猛梁凌熏张群刘晶晶柳燕丽李艳艳赵峰刘明涛王斐邵恒玉周勇邓依峰夏楠刘树军
Owner PETROCHINA CO LTD
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