Gel water shut-off and profile control agent and preparation method thereof

A water profile control agent and gel technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance and salt resistance, short plugging validity period, high cost of profile control agent, and achieve sealing. The effect of long blocking period, low equipment requirements, and adjustable gel time

Inactive Publication Date: 2016-07-06
国能辽宁环保产业集团有限公司材料分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a gel water plugging profile control agent and its preparation method, which solves the problem of high cost of profile control agent, poor temperature and salt resistance performance in the actual production and application of existing profile control agents, and high temperature and high mine Technical problems of easy dehydration, poor stability, and short effective period of plugging under chemical conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1, Prepare a gel water plugging profile control agent, take each component according to the following weight percentage: nonionic polyacrylamide 0.4%, potassium dichromate 0.2%, sodium thiosulfate 0.1%, thiourea 0.1%, sodium bicarbonate 0.01%, the balance is water, the molecular weight of non-ionic polyacrylamide is 5 million to 8 million, and the degree of hydrolysis is 5%-10%; among them, potassium dichromate, sodium thiosulfate, and thiourea are used as cross-linking agents, and sodium bicarbonate Sodium hydroxide, potassium hydroxide or sodium carbonate can be substituted as regulators.

[0012] The steps of the preparation method are as follows: (a) according to the weight percentage of the above-mentioned components, first put the non-ionic polyacrylamide into the mixer with water added in advance and stir, and dissolve for 1 hour to form a polyacrylamide solution;

[0013] (b) Add crosslinking agent and regulator to polyacrylamide solution and dissolve f...

Embodiment 2

[0016] Example 2, Prepare a gel water plugging profile control agent, take each component according to the following weight percentage: nonionic polyacrylamide 0.6%, potassium dichromate 0.3%, sodium thiosulfate 0.15%, thiourea 0.15%, sodium bicarbonate 0.03%, the balance is water, the molecular weight of non-ionic polyacrylamide is 5 million to 8 million, and the degree of hydrolysis is 5%-10%; among them, potassium dichromate, sodium thiosulfate, and thiourea are used as cross-linking agents, and sodium bicarbonate Sodium hydroxide, potassium hydroxide or sodium carbonate can be substituted as regulators.

[0017] The steps of the preparation method are as follows: (a) according to the weight percentage of the above-mentioned components, first put the non-ionic polyacrylamide into the mixer with water added in advance and stir, and dissolve for 1 hour to form a polyacrylamide solution;

[0018] (b) Add crosslinking agent and regulator to polyacrylamide solution and dissolv...

Embodiment 3

[0021] Example 3, Prepare a gel water plugging profile control agent, take each component according to the following weight percentage: nonionic polyacrylamide 0.8%, potassium dichromate 0.4%, sodium thiosulfate 0.2%, thiourea 0.2%, sodium bicarbonate 0.05%, the balance is water, the molecular weight of non-ionic polyacrylamide is 5 million to 8 million, and the degree of hydrolysis is 5%-10%; among them, potassium dichromate, sodium thiosulfate, and thiourea are used as cross-linking agents, and sodium bicarbonate Sodium hydroxide, potassium hydroxide or sodium carbonate can be substituted as regulators.

[0022] The steps of the preparation method are as follows: (a) according to the weight percentage of the above-mentioned components, first put the non-ionic polyacrylamide into the mixer with water added in advance and stir, and dissolve for 1 hour to form a polyacrylamide solution;

[0023] (b) Add crosslinking agent and regulator to polyacrylamide solution and dissolve ...

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PUM

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Abstract

The invention provides a gel water shut-off and profile control agent and a preparation method thereof and solves the technical problems that existing profile control agents are high in profile control cost and poor in temperature and salt resistance in actual production application and are prone to dewatering, poor in stability and short in shut-off valid period under a high-temperature and high-salinity condition. The gel water shut-off and profile control agent comprises, by weight percentage, 0.4-0.8% of nonionic polyacrylamide, 0.4-0.8% of crosslinking agent and 0.01-0.05% of modifier, wherein the crosslinking agent is the mixture of potassium dichromate, sodium thiosulfate and thiourea, the modifier is one of sodium hydroxide, potassium hydroxide, sodium carbonate or sodium bicarbonate, and the temperature is kept at 45-80 DEG C for 4-48 hours. The gel water shut-off and profile control agent is capable of lowering the use amount of chemical agents, low in cost, adjustable in gelation time, capable of achieving on-site continuous operation and sustainable pumping under high temperature, high in in heat and salt resistance stability under a high-temperature condition, and applicable to different types of profile control and water shut-off operations.

Description

technical field [0001] The invention relates to the technical field of oil field water plugging and profile control, in particular to a gel water plugging profile control agent and a preparation method thereof. Background technique [0002] Water plugging and profile control technology is an effective way to improve water injection effect and oil recovery in the oilfield field entering the high water cut stage. Domestic enterprises and scholars have conducted in-depth research on this aspect and developed a variety of water plugging and profile control agents. For example, the public The patent document No. CN103694977A describes a kind of anti-shear delay cross-linking organic profile control agent, which uses anionic polyacrylamide as the cross-linking main body. Because of the molecular group association and molecular arrangement, the base liquid Low viscosity, poor temperature and salt resistance, and high viscosity of the base fluid. In actual operation, there will be p...

Claims

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Application Information

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IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor刘金鹏王刚吴雄伟闫洪坤刘晓蒙
Owner国能辽宁环保产业集团有限公司材料分公司