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Method for stabilizing displacing fluid viscosity

A displacement fluid and viscosity technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor high temperature resistance and salt resistance, achieve good viscosity retention effect, reduce usage, and enhance viscosity The effect of stability

Active Publication Date: 2014-04-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for stabilizing the viscosity of the displacement fluid to solve the problems of poor high temperature resistance and salt resistance of the polymer solution in the prior art

Method used

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  • Method for stabilizing displacing fluid viscosity
  • Method for stabilizing displacing fluid viscosity
  • Method for stabilizing displacing fluid viscosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Molecular weight is 10 million and the degree of hydrolysis is the viscosity retention rate of polyacrylamide solution of 28%. Anionic polyacrylamide with a molecular weight of 10 million and a degree of hydrolysis of 28% and hexamethylenetetramine are selected as the medicament.

[0036] Specific experimental steps:

[0037] Prepare a polyacrylamide mother solution with a concentration of 5000mg / L with water at 2°C, stir for 4 hours, and let stand for 4 hours;

[0038] Use clear water to dilute the mother liquor into a polyacrylamide solution with a concentration of 1500mg / L, stir for 1 hour, and let it stand for 2 hours to make it mix evenly;

[0039] Add hexamethylenetetramine to the prepared solution so that the concentration of hexamethylenetetramine in the solution reaches 15mg / L, stir for 0.5 hours to fully dissolve;

[0040] The prepared samples were stored in a constant temperature water bath at 70°C, and the viscosity changes were regularly measured at 70°C....

Embodiment 2

[0042] Molecular weight is 10 million and the degree of hydrolysis is the viscosity retention rate of polyacrylamide solution of 28%. Anionic polyacrylamide with a molecular weight of 10 million and a degree of hydrolysis of 28% and hexamethylenetetramine are selected as the medicament. Concrete experimental procedure is the same as embodiment 1, but the concentration of hexamethylenetetramine reaches 75mg / L in the solution. See Table 1 for the experimental results.

Embodiment 3

[0044] Molecular weight is 10 million and the degree of hydrolysis is the viscosity retention rate of polyacrylamide solution of 28%. Anionic polyacrylamide with a molecular weight of 10 million and a degree of hydrolysis of 28% and hexamethylenetetramine are selected as the medicament. The specific experimental procedure is the same as in Example 1, but the concentration of hexamethylenetetramine in the solution reaches 150mg / L. See Table 1 for the experimental results.

[0045] Table 1

[0046] Hexamethylenetetramine concentration

[0047] Viscosity after 3 weeks

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Abstract

The invention discloses a method for stabilizing the displacing fluid viscosity, which comprises the following steps of: preparing polymer solution mother liquor; adding anionic polyacrylamide into water and fully dissolving the anionic polyacrylamide; adding sewage for diluting the polymer solution mother liquor; and adding hexamethylene tetramine and fully dissolving the hexamethylene tetramine. The method has the advantages that the viscosity stability of the polyacrylamide is improved, the consumption of the polyacrylamide is reduced, the cost is reduced, in addition, the addition quantity of the hexamethylene tetramine is small, the viscosity keeping effect is good, the high-temperature resistance performance and the salt resistance performance of the polyacrylamide are improved, and in addition, the viscosity stability of the displacing fluid is enhanced so that the viscosity retention rate of the displacing fluid is greatly improved.

Description

technical field [0001] The invention relates to the technical field of chemicals used in the petroleum industry, in particular to a method for stabilizing the viscosity of a displacement fluid. Background technique [0002] At present, domestic oilfields generally enter the stage of tertiary oil recovery. For oilfields with high water content, the viscosity of the displacement fluid is increased by injecting lye, surfactant or polymer solution, thereby reducing the mobility ratio of the displacement fluid and increasing the sweep coefficient. , by reducing the oil-water interfacial tension, improve the oil displacement efficiency, and increase the recovery factor of the oil field. However, the anionic polyacrylamide commonly used in oilfields is often affected by high temperature and high salinity, which is prone to degradation and has poor compatibility with sewage, which makes it difficult for polymer flooding to achieve the desired effect. [0003] The Chinese patent wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/58
Inventor 邢毅平春霞邢琳曹宗仑张英雄马友富
Owner CHINA PETROLEUM & CHEM CORP
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