Environment-friendly high strength profile control water shut-off agent and preparation method thereof

A profile control water blocking agent, high-strength technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as human hazards, environmental pollution, profile control agent pollution, etc., to achieve good stability and environmental friendliness , Improve the effect of section ability and plugging ability

Inactive Publication Date: 2014-07-23
浙江仁智股份有限公司
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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 environment-friendly high-strength profile control and water shutoff agent and its preparation method in view of the problems that existing profile control agents are polluted, and long-term use will cause environmental pollution and harm to the human body.

Method used

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  • Environment-friendly high strength profile control water shut-off agent and preparation method thereof
  • Environment-friendly high strength profile control water shut-off agent and preparation method thereof
  • Environment-friendly high strength profile control water shut-off agent and preparation method thereof

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Embodiment 1

[0034] In the profile control and water blocking agent of this embodiment, the mass concentration of polymer polyacrylamide is 6000mg / L, and the molecular weight of polyacrylamide is 10 million; The mass ratio of the polymer to the cross-linking agent is 4:1, that is, the mass percentage of the cross-linking agent polyethylene is 2500mg / L; the catalyst is acetic acid, and the mass percentage of acetic acid in the profile control and water shutoff agent is 0.01%; The mass percentage of the antioxidant sodium metabisulfite in the profile control water shutoff agent is 0.02%. The gelling time of the profile control and water shutoff agent in this embodiment is 24 hours, and the final setting strength reaches the G grade.

[0035] Preparation method: Weigh each component according to the proportion, add part of water to polyacrylamide, stir evenly to prepare a polyacrylamide solution with a mass concentration of 6000 mg / l, and mature at room temperature for 3 to 4 hours to obtain ...

Embodiment 2

[0037] In the profile control and water blocking agent of this embodiment, the mass concentration of polymer polyacrylamide is 8000mg / L, and the molecular weight of polyacrylamide is 10 million; The mass ratio of polymer to crosslinking agent is 6:1; the catalyst is acetic acid, and the mass percentage of acetic acid in the profile control and water shutoff agent is 0.01%; the mass percentage of antioxidant sodium metabisulfite in the profile control and water shutoff agent is 0.02% . The gelling time of the profile control and water shutoff agent in this embodiment is 40 hours, and the final setting strength reaches grade D.

[0038] Preparation method: Weigh each component according to the proportion, add part of water to polyacrylamide, stir evenly to prepare a polyacrylamide solution with a mass concentration of 6000 mg / l, and mature at room temperature for 3 to 4 hours to obtain the mature mother liquor. Then add the catalyst and the remaining water to the aging mother l...

Embodiment 3

[0040] In the profile control and water blocking agent of this embodiment, the mass concentration of polymer polyacrylamide is 8000mg / L, and the molecular weight of polyacrylamide is 10 million; The mass ratio of polymer to crosslinking agent is 8:1; the catalyst is citric acid, and the mass percentage of acetic acid in the profile control and water shutoff agent is 0.01%; the mass percentage of antioxidant sodium metabisulfite in the profile control and water shutoff agent is 0.02 %. The gelling time of the profile control and water shutoff agent in this embodiment is 40 hours, and the final setting strength reaches grade D.

[0041] Preparation method: Weigh each component according to the proportion, add part of water to polyacrylamide, stir evenly to prepare a polyacrylamide solution with a mass concentration of 6000 mg / l, and mature at room temperature for 3 to 4 hours to obtain the mature mother liquor. Then add the catalyst and the remaining water to the aging mother l...

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Abstract

The invention discloses an environment-friendly high strength profile control water shut-off agent and a preparation method thereof, and aims to solve the problems that conventional water shut-off agents are pollutant, and long-term use of the conventional water shut-off agent will pollute the environment and harm the human body. The water shut-off agent is composed of high polymers, a cross-linking agent, a catalyst, an antioxidant, and water. Through the organic cooperation among high polymers, a cross-linking agent, and a catalyst, a high strength, environment-friendly, and non-toxic profile control water shut-off agent is prepared, and the water shut-off agent can be widely applied to water shut-off operations of various oil reservoir profile controls. Polyaziridine is taken as the cross-linking agent, and the prepared gel has the advantages of deeper processing ground layer, higher strength, better stability, environment-friendliness, and no toxicity. Experiment results have proven that the water shut-off agent can well improve the profile performance and the water shut-off performance, is capable of being applied to the oil fields, and can improve the development effect of oil field water injection. The water shut-off agent is compounded by high polymers, a cross-linking agent, an antioxidant, and the like, and can be widely applied to water shut-off operations of various oil reservoir profile controls.

Description

technical field [0001] The invention relates to the field of chemical industry, especially the field of oil field recovery, and specifically relates to an environment-friendly high-strength profile control and water shutoff agent and a preparation method thereof. Background technique [0002] During the long-term development of the oil field, the energy of the formation gradually decays, and water injection must be used for production. Due to long-term water injection production, a large amount of scour during water injection leads to swelling and dissolution of oil layer clay and cement, and migration of particles, resulting in more and more serious formation heterogeneity. Due to the heterogeneity of the reservoir and the unfavorable oil-water mobility ratio, the injected water advances unevenly along the high-permeability layer and the high-permeability zone, forming a single-layer intrusion in the vertical direction and fingering in the lateral direction, and finally cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512C09K8/5045C09K8/506C09K8/5083
Inventor 张军何志强冉汶鑫陈蔚立熊俊李伟强杨智彭啟强
Owner 浙江仁智股份有限公司
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