Organic-inorganic composite gel plugging agent and its preparation method and application

A composite gel and plugging agent technology, which is applied in the field of drilling fluid plugging, can solve the problems of lack of toughness, high temperature resistant inorganic gel, etc., and achieve the effect of overcoming low strength, high gel strength and high temperature stability

Active Publication Date: 2020-06-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an organic-inorganic composite hybrid gel plugging agent and its preparation method and application in order to overcome the problems of the organic gel plugging agent not being resistant to high temperature and the lack of toughness of the inorganic gel in the prior art

Method used

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  • Organic-inorganic composite gel plugging agent and its preparation method and application
  • Organic-inorganic composite gel plugging agent and its preparation method and application
  • Organic-inorganic composite gel plugging agent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0084] The composition of the gel plugging agent is as follows: the content of the organic composite comonomer is 10%, the content of the organic composite crosslinking agent is 1.5%, the content of the initiator potassium persulfate is 0.08%, and the content of the inorganic polymer salt is 2%. , the content of latent alkali carbonamide is 1%, and the balance is water.

[0085] Wherein, the organic comonomers are acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and tert-butyl acrylate. Based on the total weight of the organic copolymerized composite monomer, the mass ratio of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and tert-butyl acrylate is 1:0.4:0.04.

[0086] Wherein, based on the total weight of the organic composite crosslinking agent, the mass ratio of N,N-methylenebisacrylamide to polyethyleneimine is 1:0.4.

[0087] Wherein, the inorganic polymer salt is a mixture of polyaluminum ferric sulfate and polyaluminum ferric chloride. Based on the total ...

Embodiment 2

[0091]Adopt the method identical with embodiment 1 to prepare gel plugging agent, difference is: the composition of gel plugging agent is: the content of organic composite comonomer is 12%, and the content of organic composite crosslinking agent is 0.5%, The content of initiator is 0.03%, the content of inorganic polymer salt is 5%, the content of ammonium carbamate is 3%, and the balance is water. The gel plugging agent A2 was obtained.

[0092] The initial apparent viscosity and initial elastic modulus test results of gel plugging agent solution A2 after gelling are shown in figure 1 and figure 2 shown. See Table 1 for the high-temperature plugging effect of gel plugging agent solution A2 after gelling.

Embodiment 3

[0094] The gel plugging agent was prepared by the same method as in Example 1, except that the mass ratio of acrylamide, monomers containing sulfonic acid groups, and organic ester monomers was 1:0.6:0.1. The gel plugging agent A3 was obtained.

[0095] For the initial apparent viscosity and initial elastic modulus test results of gel plugging agent solution A3, see figure 1 and figure 2 shown. See Table 1 for the high-temperature plugging effect of gel plugging agent solution A3 after gelling.

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Abstract

The invention relates to the field of drilling fluid plugging in high-temperature formations, and discloses an organic-inorganic composite gel plugging agent as well as its preparation method and application. The organic-inorganic composite gel plugging agent includes an organic composite comonomer, an organic composite crosslinking agent, an initiator, an inorganic polymer salt, a latent base and water. The organic-inorganic gel plugging agent has excellent gel strength and high-temperature stability, and has an excellent plugging effect on high-temperature fracture loss formations.

Description

technical field [0001] The invention relates to the field of drilling fluid plugging in high-temperature formations, in particular to an organic-inorganic composite gel plugging agent and its preparation method and application. Background technique [0002] Lost circulation is one of the most common downhole complex problems in the drilling process at present. It is an accident that seriously affects the safety of drilling engineering construction. It is a phenomenon that drilling fluid or other working fluids leak into the formation during drilling. It will not only prolong the drilling cycle, but also bring unnecessary losses to the construction unit. After the lost circulation occurs, it will also have a great negative impact on the exploration of underground oil and gas reservoir resources. Therefore, the leakage prevention and plugging of drilling fluid has always been a hot issue in the field of petroleum engineering at home and abroad. [0003] In view of the perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/42C08F220/56C08F220/58C08F220/18C08F222/38C08F212/14C08F218/08C08F220/14C08F283/00
CPCC08F220/56C08F283/00C09K8/03C09K8/426C08F220/585C08F220/1804C08F222/385C08F212/14C08F218/08C08F220/14
Inventor 白英睿孙金声吕开河王金堂刘敬平黄贤斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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