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Preparation method of heat-resistant and salt-resistant polyacrylamide for oil field

A polyacrylamide, temperature-resistant and salt-resistant technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of slow viscosity degradation and other problems, and achieve low production cost, high viscosity retention rate, accurate and uniform degree of hydrolysis Effect

Active Publication Date: 2017-05-03
ANHUI JUCHENG FINE CHEM
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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 method for preparing temperature-resistant and salt-resistant polyacrylamide for oil fields. The product prepared by this method has stable quality, high viscosity, temperature resistance and salt resistance, and slow viscosity degradation in high temperature and high salinity environments. , and the dissolution speed is fast and the solubility is good, which solves the difficulties in the use of heat-resistant and salt-resistant polyacrylamide for oilfields in the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) at 13m 3 The volume dispensed in the batching tank is 11 m 3 solution, which contains 1.63T of acrylamide, 155kg of sodium acrylate, a solution with a pH value of 6.5 (concentration of 38-40%), 16kg of thiourea, and 2-acrylamide-2-methylpropanesulfonate sodium 1.5T solution with a pH value of 6.5 (concentration: 38-40%), replenish water to 11m³ with deionized water, fully mix the above raw materials, stir mechanically until the solution is clear, adjust the pH value to 7.1 with sodium carbonate, and obtain No solid insoluble homopolymer solution; according to mass ratio, azobisisoheptanonitrile: 3-methylaminopropionitrile: 4,4'- azobis(cyanovaleric acid): acetone: sodium hydroxide: pure water = 2.8: 2.1: 7: 2.2: 2: 45.7 Prepare 100 kg of a chain extender solution with a pH value of 7.5.

[0022] (2) After cooling the obtained homopolymer liquid to 1-1.5°C, pump it into the polymerization kettle, add 3.75kg of azobisisovaleronitrile, and after feeding high-purity n...

Embodiment 2

[0025] (1) at 13m 3 The volume dispensed in the batching tank is 11 m 3 A solution containing 1.57T of acrylamide, 60kg of sodium acrylate at a pH of 6.5, 16kg of dimethylamide, and 1.66T of 2-acrylamide-2-methylpropanesulfonate at a pH of 6.5 For a solution of 6.5, add water to 11m³ with deionized water, fully mix the above raw materials, mechanically stir until the solution is clear, adjust the pH value to 7.1 with sodium hydroxide, and obtain a homopolymer solution without solid insolubles; according to the mass ratio, even Azodiisoheptanonitrile: 3-methylaminopropionitrile: 4,4'-azobis(cyanovaleric acid): acetone: sodium hydroxide: pure water = 2.9: 2.1: 7: 2.2: 1: 45.7 Configure 100kg , A chain extender solution with a pH value of 7.5.

[0026] (2) After circulating and cooling the obtained homopolymer liquid to 1-1.5°C, pump it into the polymerization kettle, add 4kg of azobisisovaleronitrile, and after feeding high-purity nitrogen for 30 minutes, first add 8.8kg of th...

Embodiment 3

[0029] (1) at 13m 3 The volume dispensed in the batching tank is 11 m 3A solution containing 1.73T of acrylamide, 60kg of sodium acrylate with a pH of 6.5, 16kg of sodium salicylate, and 1.49T of 2-acrylamide-2-methylpropanesulfonate with a pH of 6.5 For a solution of 6.5, add water to 11m³ with deionized water, fully mix the above raw materials, stir until the solution is clear, adjust the pH value to 7.1 with sodium carbonate, and obtain a homopolymer solution without solid insolubles; according to the mass ratio, azo Diisoheptanonitrile: 3-methylaminopropionitrile: 4,4'-azobis(cyanovaleric acid): acetone: sodium hydroxide: pure water = 2.9: 2.1: 7: 2.3: 1: 45.6 configuration 100kg, Chain extender solution at pH 7.5.

[0030] (2) After cooling the obtained homopolymer liquid to 1-1.5°C, pump it into the polymerization kettle, add 4.2kg of azobisisovaleronitrile, and after feeding high-purity nitrogen for 30 minutes, first add 7.7kg evenly to prepare chain extender solutio...

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Abstract

The invention provides a preparing method for heat resistance and salt tolerance polyacrylamide used in an oil field. The preparing method comprises the following steps that acrylamide, 2- acrylamide-2-methyl sodium, sodium acrylate, aiding solvent and deionized water are mixed to be dissolved fully and uniformly, and alkali is used for adjusting a pH value to obtain a homopolymerisation solution; the homopolymerisation solution is pumped into a polymerizing pot after being cooled, 2,2'-azobis-(2-methylbutyronitrile) is added, nitrogen is introduced, chain extender is added at first, then solutions prepared by complexing agents, oxidizing agents, reducing agents and auxiliary reducing agents are added sequentially, after all the solutions are added, nitrogen continues to be introduced, the polymerization reaction is carried out, heat is preserved, and the aging reaction is carried out to obtain a polyacrylamide rubber block; the rubber block is taken out, cutting, pelleting, drying, smashing and screening are carried out on the rubber block to obtain high-hydrolysis-degree polyacrylamide. The polyacrylamide obtained through the method has the advantages of stable quality, high viscosity, heat resistance, salt tolerance, high dissolving speed and good solubility, the product energy consumption is low, and in the high-temperature and high-salinity environment, the viscosity is degraded slowly.

Description

technical field [0001] The invention relates to a preparation method of temperature-resistant and salt-resistant polyacrylamide for oil fields, belonging to the field of water-soluble polymer synthesis. Background technique [0002] Polyacrylamide is widely used in many fields, especially in the field of oil field exploitation. With the development of oilfield exploitation, most oilfields have entered the stage of tertiary oil recovery. The characteristics of polyacrylamide used in the third mining stage require high viscosity, low viscosity degradation rate at high temperature and high salinity, and can maintain high viscosity characteristics under high temperature and high salinity bottom conditions for a long time. At present, most of the temperature-resistant and salt-resistant polyacrylamides for oilfields on the market are modified by changing the polymerization process to a post-hydrolysis polymerization process, and adding a hydrolysis machine to perform secondary h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/06C09K8/588
Inventor 王林陆海段百军徐强赵鹏肖洋洋李梦旋杨金辉
Owner ANHUI JUCHENG FINE CHEM
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