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A kind of physical adsorption type selective water blocking agent and its synthesis method

A technology of physical adsorption and water blocking agent, applied in chemical instruments and methods, drilling composition, etc., can solve the problems of incapable formation rock surface adsorption, poor oil-water selectivity, poor scour resistance, etc., to improve compression resistance and plugging. Water effect, good blocking ability, innovative effect

Inactive Publication Date: 2016-10-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. At present, the commonly used polyacrylamide selective water blocking agent has a short action time, cannot be adsorbed on the rock surface of the formation for a long time, and has poor erosion resistance
[0004] 2. The actual oil-water selectivity of the commonly used selective water blocking agent is relatively poor, and it also has a certain sealing performance for oil while blocking water

Method used

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  • A kind of physical adsorption type selective water blocking agent and its synthesis method
  • A kind of physical adsorption type selective water blocking agent and its synthesis method
  • A kind of physical adsorption type selective water blocking agent and its synthesis method

Examples

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Comparison scheme
Effect test

example 1

[0022] Example 1: Proportioning the following materials according to the molar ratio:

[0023]

[0024] After mixing according to the above ratio, it is realized through the following steps:

[0025] Under stirring, dissolve acrylic acid (AA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in deionized water, and continue stirring until the mixed solution is transparent. NaOH aqueous solution was slowly added dropwise to adjust the pH to 6; an aqueous solution of acrylamide (AM) and methacryloyloxyethyltrimethylammonium chloride (DMC) was added to the mixture. Add the initiator system oxidant ((NH4)2S208) and reducing agent NaHS03 under the condition of nitrogen protection, carry out the polymerization reaction at 45°C for 4 hours to obtain a colloidal product; the obtained product is sheared and granulated, dried and pulverized at 70°C to obtain Powdered polymer with a viscosity average molecular weight of 7.57 million.

example 2

[0026] Example 2: Proportion the following materials according to the following molar numbers:

[0027]

[0028]

[0029] After mixing according to the above ratio, it is realized through the following steps:

[0030] Under stirring, dissolve acrylic acid (AA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in deionized water, and continue stirring until the mixed solution is transparent. NaOH aqueous solution was slowly added dropwise to adjust the pH to 6; an aqueous solution of acrylamide (AM) and methacryloyloxyethyltrimethylammonium chloride (DMC) was added to the mixture. Add the initiator system oxidant ((NH4)2S208) and reducing agent NaHS03 under the condition of nitrogen protection, carry out the polymerization reaction at 45°C for 4 hours to obtain a colloidal product; the obtained product is sheared and granulated, dried and pulverized at 70°C to obtain Powdered polymer with a viscosity-average molecular weight of 11.96 million.

example 3

[0031] Example 3: Proportioning the following materials according to the following parts by weight:

[0032]

[0033] After mixing according to the above ratio, it is realized through the following steps:

[0034] Under stirring, dissolve acrylic acid (AA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in deionized water, and continue stirring until the mixed solution is transparent. NaOH aqueous solution was slowly added dropwise to adjust the pH to 6; an aqueous solution of acrylamide (AM) and methacryloyloxyethyltrimethylammonium chloride (DMC) was added to the mixture. Add the initiator system oxidant ((NH4)2S208) and reducing agent NaHS03 under the condition of nitrogen protection, carry out the polymerization reaction at 45°C for 4 hours to obtain a colloidal product; the obtained product is sheared and granulated, dried and pulverized at 70°C to obtain Powdered polymer with a viscosity average molecular weight of 8 million.

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Abstract

The invention discloses a physical adsorption type selective water blocking agent and a synthesis method thereof. The water blocking agent is composed of the following components in molar fractions: 8 parts of acrylamide, 1-5 parts of acrylic acid, 2-acrylamide 0.15-0.6 parts of ‑2‑methylpropanesulfonic acid, 0.15‑0.6 parts of methacryloxyethyltrimethylammonium chloride, 0.1% of the mass of the four polymerization monomers of initiator A and initiator B -0.5%. The water shutoff agent can be adsorbed in large quantities on the gravel and cemented to form a three-dimensional network structure consolidated body, which can greatly improve the compression resistance and water shutoff effect, and has good plugging ability, oil-water selectivity and erosion resistance.

Description

technical field [0001] The invention relates to a water shutoff agent and a synthesis method thereof, in particular to a water shutoff agent used in shallow oil reservoir layers and a synthesis method thereof in the technical field of petroleum and natural gas exploitation. Background technique [0002] With the extension of oilfield development time, most of my country's oilfield production has entered the middle and late stage of water flooding, and the production decline is getting faster and faster, but the underground recoverable reserves are still relatively large. Therefore, how to improve the production efficiency in the middle and late stage of oilfield development It has become a focus of attention of the oil industry. More than 80% of my country's onshore oil is developed by water injection. For oil fields developed by water flooding, water production from oil wells is a common problem. Therefore, "stabilizing oil and controlling water" is the only way to control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F220/34C08F4/40C09K8/42C09K8/588
Inventor 李良川吴均张宏玉周燕刘怀珠彭通路海伟杨昊孙蓉郑淑媛魏金霞朱昆伦
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)