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Preparation method of high salt resistant polyacrylamide oil displacement agent

A polyacrylamide oil displacing agent and acrylamide technology, which are applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that polyacrylamide has poor temperature resistance, salt resistance and shear resistance, and common polymers are difficult to Realize, can not realize the problem of effective oil displacement, etc., to achieve the effect of good effect, fast dissolution speed, and enhanced chain link strength

Inactive Publication Date: 2018-07-06
TIANJIN BO HONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary polyacrylamide for oil displacement has poor temperature resistance, salt resistance, and shear resistance. Therefore, it cannot maintain good viscosity-increasing ability and achieve effective oil displacement under harsh reservoir conditions.
Second, in order to protect the environment, the oil field began to prepare polymers with sewage, especially with such ultra-high salinity sewage, which is difficult for ordinary polymers to achieve.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of an anti-high-salt polyacrylamide oil displacement agent, comprising the steps of:

[0018] (1) Add 36 parts of granular alkali to 530 parts of pure water, dissolve evenly and slowly add 178 parts of 2-acrylamide-2-methylpropanesulfonic acid, and add 19 parts of vinylpyrrolidone in a constant temperature water bath to keep below 15°C , after stirring evenly, add 149 parts of refined acrylamide monomer;

[0019] (2) Cool the solution obtained in step (1) to -5°C, transfer it into a Dewar flask, use 99.999% or more high-purity nitrogen to remove oxygen for 10 minutes, add 0.025 parts of EDTA, and add azobisisoheptane after removing oxygen for 20 minutes Nitrile 0.28 part, continue to deoxygenate for 20 minutes, add 0.001 part of initiator tert-butyl hydroperoxide, add reducing agent ferrous ammonium sulfate 0.005 part after 2 minutes, continue to pass nitrogen until the solution becomes viscous, seal it, and wait for the temperature of the solution ...

Embodiment 2

[0022] A preparation method of an anti-high-salt polyacrylamide oil displacement agent, comprising the steps of:

[0023] (1) Add 38 parts of granular alkali to 540 parts of pure water, dissolve evenly and slowly add 181 parts of 2-acrylamide-2-methylpropanesulfonic acid, and add 21 parts of vinylpyrrolidone in a constant temperature water bath to keep below 15°C , after stirring evenly, add 153 parts of refined acrylamide monomer;

[0024] (2) Cool the solution obtained in step (1) to -5°C, transfer it into a Dewar flask, use 99.999% or more high-purity nitrogen to remove oxygen for 10 minutes, add 0.031 parts of EDTA, add azobisisoheptane after removing oxygen for 20 minutes Nitrile 0.25 parts, continue to deoxygenate for 20 minutes, then add 0.0015 parts of initiator tert-butyl hydroperoxide, add reducing agent ferrous ammonium sulfate 0.008 parts after 2 minutes, continue to pass nitrogen until the solution becomes viscous, seal it, and wait for the temperature of the solu...

Embodiment 3

[0027] A preparation method of an anti-high-salt polyacrylamide oil displacement agent, comprising the steps of:

[0028] (1) Add 37 parts of granular alkali to 535 parts of pure water, dissolve evenly and slowly add 180 parts of 2-acrylamide-2-methylpropanesulfonic acid, and add 20 parts of vinylpyrrolidone in a constant temperature water bath to keep below 15°C , after stirring evenly, add 150 parts of refined acrylamide monomer;

[0029] (2) Cool the solution obtained in step (1) to -5°C, transfer it into a Dewar flask, use 99.999% or more high-purity nitrogen to remove oxygen for 10 minutes, add 0.03 parts of EDTA, and add azobisisoheptane after removing oxygen for 20 minutes Nitrile 0.25 part, continue to deoxygenate for 20 minutes, add 0.001 part of initiator tert-butyl hydroperoxide, add reducing agent ferrous ammonium sulfate 0.006 part after 2 minutes, continue to pass nitrogen until the solution becomes viscous, seal it, and wait for the temperature of the solution t...

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Abstract

The invention discloses a high salt resistant polyacrylamide oil displacement agent. The high salt resistant polyacrylamide oil displacement agent is formed by polymerization of 149-153 parts of acrylamide, 178-181 parts of 2-acrylamide-2-methylpropane sulfonic acid, 19-21 parts of vinylpyrrolidone, and 0.025-0.031 part of EDTA under the action of a redox-azo compound initiation system, and the redox-azo compound initiation system is composed of 0.28-0.25 part of azo-azobisisoheptonitrile, 0.001-0.0015 part of tert-butyl peroxide and 0.005-0.008 part of ammonium ferrous sulfate.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, in particular to a preparation method of a polyacrylamide oil displacement agent. Background technique [0002] Oil, known as the black "blood" of the modern economy, is related to economic development, social stability and people's lives. Petroleum is so important, but it is indeed a non-renewable resource. At present, my country's oilfield exploitation has entered the middle and late stages. In order to improve crude oil recovery, the current oilfield exploitation mainly adopts polymer flooding technology, and polyacrylamide (PAM) is the most common in the market. Oil displacement products. Now it has been used on a large scale in my country's Daqing Oilfield, Shengli Oilfield, Liaohe Oilfield, Xinjiang Oilfield and other large oilfields. However, ordinary polyacrylamide for oil displacement has poor temperature resistance, salt resistance, and shear resistance. Therefore, it ca...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/56C08F226/10C09K8/588
CPCC08F220/58C08F220/585C09K8/588C08F220/56C08F226/10
Inventor 李元军刘存辉李雷振王欢庞玉山胡良义郑伟刘洁孙凤萍石昀范翠杰崔萌陈芝娟张宇赵东旭马亮王伟霍艳玲蓝海宽李玉亮毛艳妮
Owner TIANJIN BO HONG CHEM
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