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Profile-control and water-plugging agent and profile-control and water-plugging method used for profile control and water plugging of high-temperature and high-salinity oil reservoir

A technology of profile control, water plugging and high salinity, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature and salt resistance of plugging agents, and achieve high plugging strength and long-term The effect of stability and high temperature resistance

Active Publication Date: 2016-05-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a plugging agent and a method for profile control and water plugging in high-temperature and high-salinity oil reservoirs, so as to solve the problem that the plugging agent in the prior art has poor temperature and salt resistance and is not suitable for Problems of Profile Control and Water Shutoff in High Temperature and High Salinity Reservoirs

Method used

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  • Profile-control and water-plugging agent and profile-control and water-plugging method used for profile control and water plugging of high-temperature and high-salinity oil reservoir
  • Profile-control and water-plugging agent and profile-control and water-plugging method used for profile control and water plugging of high-temperature and high-salinity oil reservoir
  • Profile-control and water-plugging agent and profile-control and water-plugging method used for profile control and water plugging of high-temperature and high-salinity oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The raw material formula of plugging agent is as follows:

[0050]

[0051] The plugging agent preparation process is as follows:

[0052] Add hydrolyzed polyacrylamide to the above-mentioned calcium ion-containing water while stirring, and obtain a polymer solution after aging; add a crosslinking agent and a stabilizer to the polymer solution while stirring, and form a transition solution after being dissolved; finally, add a transition solution to the transition solution Add inorganic particle inducer to form a mixed solution;

[0053] The above mixed solution is subjected to a cross-linking reaction at a temperature of 120°C to form an organic / inorganic composite gel, that is, to form a plugging agent.

[0054] The above-mentioned plugging agent was kept at 120°C for 60 days, and the colloid did not dehydrate, and the viscosity retention rate was 75.5%.

Embodiment 2

[0056] The raw material formula of plugging agent is as follows:

[0057]

[0058] The plugging agent preparation process is as follows:

[0059] Add hydrolyzed polyacrylamide to the above-mentioned calcium ion-containing water while stirring, and obtain a polymer solution after aging; add a crosslinking agent and a stabilizer to the polymer solution while stirring, and form a transition solution after being dissolved; finally, add a transition solution to the transition solution Add inorganic particle inducer to form a mixed solution;

[0060] The above mixed solution is subjected to a cross-linking reaction at a temperature of 120°C to form an organic / inorganic composite gel, that is, to form a plugging agent.

[0061] The above-mentioned plugging agent was kept at 120°C for 60 days, and the colloid did not dehydrate, and the viscosity retention rate was 87.0%.

Embodiment 3

[0063] The raw material formula of plugging agent is as follows:

[0064]

[0065] The plugging agent preparation process is as follows:

[0066] Add hydrolyzed polyacrylamide to the above-mentioned calcium ion-containing water while stirring, and obtain a polymer solution after aging; add a crosslinking agent and a stabilizer to the polymer solution while stirring, and form a transition solution after being dissolved; finally, add a transition solution to the transition solution Add inorganic particle inducer to form a mixed solution;

[0067] The above mixed solution is subjected to a cross-linking reaction at a temperature of 120°C to form an organic / inorganic composite gel, that is, to form a plugging agent.

[0068] The above-mentioned plugging agent was kept at 120°C for 60 days, and the colloid did not dehydrate, and the viscosity retention rate was 80.6%.

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Abstract

The invention discloses a profile-control and water-plugging agent and a profile-control and water-plugging method used for profile control and water plugging of high-temperature and high-salinity oil reservoir. The profile-control and water-plugging agent comprises the following raw materials, by weight, 0.3-0.6% of hydrolyzed polyacrylamide, 0.1-0.2% of a crosslinking agent, 0.1-0.2% of a stabilizer, 3.2-4.0% of an inorganic particle inducer, and 95-96.3% of water containing calcium ion. In the raw materials of the profile-control and water-plugging agent, the hydrolyzed polyacrylamide can be subjected to a crosslinking reaction under the effects of the crosslinking agent and the stabilizer to form a polymer gel which has excellent anti-salt performance; the inorganic particle inducer and the calcium ion are reacted to each other to form inorganic particles which have high temperature resistance. The profile-control and water-plugging agent composed of the polymer gel and the inorganic particles belongs to an inorganic / organic composite gel and has high plugging strength and long-period stability under a high-temperature and high-salinity condition.

Description

technical field [0001] The invention relates to the field of oilfield development, in particular to a plugging agent and a method for profile control and water shutoff in high temperature and high salinity oil reservoirs. Background technique [0002] During the development of oilfields, due to differences in formation fluid mobility, reservoir heterogeneity, and long-term water flooding that further intensifies heterogeneity, dominant water flow channels are formed in the formation, resulting in premature water breakthrough or water loss in oil wells. Flooding, inefficient or ineffective circulation of water flooding. Seriously affect the water flooding development effect, thereby affecting the recovery rate of the oil field. [0003] In order to solve the above problems, the profile control and water shutoff technology of oil layers has gradually been paid attention to and developed in oil field development. Profile control and water plugging are used to increase the swe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
Inventor 罗强宫兆波吴运强唐可汪进
Owner PETROCHINA CO LTD
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