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A method for improving the viscosity stability of sulfonated polyacrylamide solution

A technology of sulfonated polyacrylamide and sulfonated polyacrylamide, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor oil displacement effect, easy flocculation and degradation of polyacrylamide, and the like. The effect of high stability, low cost and wide source of raw materials

Inactive Publication Date: 2017-11-14
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for improving the viscosity stability of sulfonated polyacrylamide solution, which is used to solve the current problem of high temperature and high salinity oil reservoir conditions. Polyacrylamide is prone to flocculation and degradation, and the oil displacement effect is not good

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] This method of improving the viscosity stability of sulfonated polyacrylamide solution: the concentration of sulfonated polyacrylamide solution is 1000-3000mg / L, the temperature is 90°C, the degree of salinity is 150000mg / L, and the concentration of divalent metal ions Ca 2+ 1000pp, Mg 2+ Under the condition of 500ppmmg / L, add Ca to the sulfonated polyacrylamide solution 2+ and Mg 2+ Ionic compound complexing agent and viscosity stabilizer, the addition amount of the compound complexing agent is: 2g / L, the compound complexing agent is composed of triethanolamine and potassium succinate, the mass ratio of triethanolamine and potassium succinate 1:2, the dosage of viscosity stabilizer sodium sulfite is 5g / L, adding Ca 2+ and Mg 2+ After compounding complexing agent and viscosity stabilizer with ions, the viscosity retention rate of sulfonated polyacrylamide solution increases by 50─99%.

[0017] (1) Referring to the underground conditions of the Qinghai oil reservoir,...

Embodiment 2

[0023] The method for improving the viscosity stability of the sulfonated polyacrylamide solution: the concentration of the sulfonated polyacrylamide solution is 1000-3000mg / L, the temperature is 90°C, the degree of salinity is 100000mg / L, and the concentration of divalent metal ions Ca 2+ 1500pp, Mg 2+ Under the condition of 200ppmmg / L, add Ca to the sulfonated polyacrylamide solution 2+ and Mg 2+ Ionic compound complexing agent and viscosity stabilizer, the addition amount of the compound complexing agent is: 3g / L, the compound complexing agent is composed of sodium gluconate and potassium oxalate, and the mass ratio of sodium gluconate and potassium oxalate is 2 : 5, the dosage of viscosity stabilizer thiourea is 3g / L, adding Ca 2+ and Mg 2+ After compounding complexing agent and viscosity stabilizer with ions, the viscosity retention rate of sulfonated polyacrylamide solution increases by 50─99%.

[0024] Experiment 2: Containing Ca 2+ and Mg 2+ Experiment with simul...

Embodiment 3

[0031]The method for improving the viscosity stability of sulfonated polyacrylamide solution: the concentration of sulfonated polyacrylamide solution is 3000mg / L, the temperature is 80°C, the degree of salinity is 200000mg / L, and the concentration of divalent metal ion Ca 2+ 1000pp, Mg 2+ Under the condition of 500ppmmg / L, add Ca to the sulfonated polyacrylamide solution 2+ and Mg 2+ Ionic compound complexing agent and viscosity stabilizer, the addition amount of compound complexing agent is: 10g / L, compound complexing agent is made by ATMP . Na 4 Composite with sodium tripolyphosphate, ATMP . Na 4 The mass ratio of sodium tripolyphosphate and sodium tripolyphosphate is 1:10, the dosage of viscosity stabilizer sodium bisulfite is 0.5g / L, adding Ca 2+ and Mg 2+ After compounding complexing agent and viscosity stabilizer with ions, the viscosity retention rate of sulfonated polyacrylamide solution increases by 50─99%.

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Abstract

The present invention relates to a method for improving the viscosity stability of sulfonated polyacrylamide solution, the method for improving the viscosity stability of sulfonated polyacrylamide solution: the concentration of sulfonated polyacrylamide solution is 1000-3000mg / L, Add calcium and magnesium ion compound complexing agent and Viscosity stabilizer, reduce the concentration of Ca2+ and Mg2+ in the solution, reduce the content of dissolved oxygen in the solution, and increase the viscosity retention rate of sulfonated polyacrylamide solution by 50─99%; the amount of complexing agent added: 0.1─10g / L , The amount of viscosity stabilizer added is: 0.1─12g / L; the compound complexing agent is composed of organic complexing agent and inorganic complexing agent. The invention realizes the high viscosity and good stability of the sulfonated polyacrylamide solution through the coupling control function, and effectively realizes the purpose of improving the oil displacement of the sulfonated polyacrylamide solution.

Description

technical field [0001] The invention relates to a polymer polyacrylamide used for oil displacement in the field of oil recovery, in particular to a method for improving the viscosity stability of a sulfonated polyacrylamide solution. Background technique [0002] Petroleum is a valuable strategic resource of the country and also a non-renewable resource. It has the title of "industrial blood" and is of great significance to national security and sustainable economic development. With the rapid development of my country's economy, the demand for oil will continue to increase, resulting in a serious shortage of oil supply in my country. Considering the needs of energy strategy and security, how to improve oil recovery is the most important way to solve this contradiction. Polymer flooding is currently a large-scale industrialized tertiary oil recovery method. However, polymer flooding also has some problems. One is that the polymer dissolves slowly, and the other is that it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 陈彦广历娜宋华王永航张娇静范丹丹
Owner NORTHEAST GASOLINEEUM UNIV
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