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Viscosity adjustable crosslinked polymer displacement agent and preparation method thereof

A technology of cross-linked polymers and preparation methods, which is applied in the field of viscosity-adjustable cross-linked polymer oil displacement agents, and can solve the problem of poor temperature resistance and salt resistance of polymers, affecting the formation flow of cross-linked polymer solutions, and failure to achieve flooding. Oil and other issues

Inactive Publication Date: 2011-07-20
BEIJING HAIEN RUNDE CHEM SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, polymer flooding has been used on a large scale in oil field production to improve oil recovery, but polymer flooding has disadvantages such as polymer temperature resistance, poor salt resistance, and easy mechanical shearing. Therefore, due to external Factors can easily make polymer flooding effect worse; in addition, how to reduce the amount of polymer used, thereby reducing injection costs is also a matter of great concern to oil fields
[0003] Chinese patent application CN 1105417A discloses a cross-linked polymer oil displacing agent and its preparation method. The cross-linking agent chromium lactate is used to convert the polymer into a cross-linked polymer, thereby solving the problem of poor salt resistance and mechanical shearing of the polymer. problem, the concentration of the polyacrylamide aqueous solution in this patent is preferably 800-8000mg / L, and the best dosage of the crosslinking agent chromium lactate is 300-3000mg / L. The disadvantage of this technical solution is: the usage amount of the crosslinking agent is relatively Big
The viscosity of the cross-linked polymer formed by cross-linking polyacrylamide with a chromium cross-linking agent is not easy to control, and the dosage of the drug is not properly controlled. The injection of the liquid solution and the flow in the formation, or even block the formation, fail to achieve the purpose of oil displacement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First prepare polyacrylamide into a solution of 5000mg / L, take a part of it and dilute it with prepared water, then add a dilute solution of cross-linking agent, the solution concentration is 1-5%. 1% is preferred. The smaller the concentration of the crosslinking agent, the easier it is to quickly mix and evenly mix with polyacrylamide. The concentration of polyacrylamide in the mixture of polyacrylamide solution and cross-linking agent dilute solution is 800 mg / L, and the concentration of cross-linking agent is 80 mg / L. Stir evenly. The viscosity of the cross-linked polymer solution was determined to be 76.0 mpa.s at a temperature of 45° C. and a shear rate of 6 r / min. After storage at 45°C for 1 day, the viscosity is 54000mpa.s, after 10 days storage, the viscosity is 2300mpa.s, after 30 days storage, the viscosity is 308mpa.s.

Embodiment 2

[0017] First prepare polyacrylamide into a solution of 5000mg / L, then dilute to a certain concentration and then add cross-linking agent and viscosity modifier to dilute solution with prepared water, wherein the concentration of cross-linking agent solution is 1-5%. 1% is preferred. After mixing, in the mixed solution, that is, the viscosity-adjustable cross-linked polymer oil displacement agent, the concentration of polyacrylamide is 800 mg / L, that of cross-linking agent is 70 mg / L, and that of viscosity modifier is 3 mg / L. Stir evenly, the viscosity of the cross-linked polymer solution measured at a temperature of 45°C and a shear rate of 6r / min is 46.8mpa.s. After being stored at 45°C for 1 day, the viscosity is 522mpa.s, and after being stored for 10 days, the viscosity is 365mpa. s, after storage for 30 days, the viscosity is 296mpa.s.

Embodiment 3

[0019] First prepare polyacrylamide into a solution of 5000mg / L, then dilute to a certain concentration and then add cross-linking agent dilute solution, the concentration is 1-5%. 1% is preferred. Stir for 8 minutes, then add the dilute solution diluted with prepared water for the viscosity regulator, after mixing, in the mixed solution, that is, the viscosity-adjustable cross-linked polymer oil displacement agent, the polyacrylamide solution is 800 mg / L, and the cross-linking agent solution The concentration of the viscosity modifier is 90mg / L, and the concentration of the viscosity modifier is 3mg / L. Stir evenly, the viscosity of the cross-linked polymer solution measured at a temperature of 45°C and a shear rate of 6r / min is 62.8mpa.s. After storage at 45°C for 1 day, the viscosity is 2000mpa.s, and after 10 days of storage, the viscosity is 1150mpa. s, after storage for 30 days, the viscosity is 820mpa.s.

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Abstract

The invention discloses a viscosity adjustable crosslinked polymer displacement agent and a preparation method thereof. The displacement agent comprises polymer, a crosslinking agent, a viscosity regulator and water for preparation, wherein the concentration of the polymer in the prepared crosslinked polymer displacement agent is 500-1,000mg / L; the concentration of the crosslinking agent is 30-120mg / L; the concentration of the viscosity regulator is 0-8mg / L; and the pH value of the water for preparation is 7.5-8.5. The preparation method comprises the following steps of: adding solution of crosslinking agent into solution of polymer, and uniformly stirring; adding solution of viscosity regulator and uniformly stirring; and regulating the viscosity of the crosslinked polymer displacement agent by regulating the using amount of the crosslinking agent and a crosslinking aid. Experiments show that: compared with 1,200mg / L polymer solution contrast, the displacement agent can improve the recovery ratio by 0 to 5 percent, and saves raw material cost by 10 to 20 percent.

Description

technical field [0001] The invention relates to a viscosity-adjustable cross-linked polymer oil displacement agent used in the petroleum field and a preparation method thereof. Background technique [0002] At present, polymer flooding has been used on a large scale in oil field production to improve oil recovery, but polymer flooding has disadvantages such as polymer temperature resistance, poor salt resistance, and easy mechanical shearing. Therefore, due to external Factors can easily make polymer flooding effect worse; in addition, how to reduce the amount of polymer used, thereby reducing injection costs is also a matter of great concern to oilfields. [0003] Chinese patent application CN 1105417A discloses a cross-linked polymer oil displacing agent and its preparation method. The cross-linking agent chromium lactate is used to convert the polymer into a cross-linked polymer, thereby solving the problem of poor salt resistance and mechanical shearing of the polymer. ...

Claims

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Application Information

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IPC IPC(8): C09K8/588
Inventor 高雁鸣刘兴玉
Owner BEIJING HAIEN RUNDE CHEM SCI & TECH
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