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Viscosity Stabilizers for Polymer Flooding

A technology of viscosity stabilizer and polymer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of large viscosity loss, reduced viscosity, and decreased oil recovery of polymers, and achieve stable viscosity and high viscosity. Long-lasting and stability-enhancing effects

Active Publication Date: 2015-09-09
DAQING HUAYING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of polymer flooding technology is that the viscosity of the polymer loses a lot due to mechanical degradation and biodegradation during the delivery process. Since the viscosity stability of the polymer aqueous solution directly affects its oil displacement effect, the viscosity decrease in oil recovery
How to take appropriate measures to improve the viscosity stability of the polymer solution is of great significance to save a large amount of polymer resources and reduce the cost of oil recovery, but the current technology cannot meet this demand, and further technical updates are still needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 5% 2-mercaptobenzimidazole, 3% hydroquinone, 10% sodium thiosulfate, 15% isothiazolinone, 7% glutaraldehyde, 7% isopropanol, 1% EDTA, and the rest water. Heat the water to 50-60°C, add other components, and stir for 30 minutes to obtain a polymer stabilizer.

Embodiment 2

[0014] 6% 2-mercaptobenzimidazole, 2% hydroquinone, 12% sodium thiosulfate, 10% isothiazolinone, 10% glutaraldehyde, 10% isopropanol, 2% EDTA, and the rest water. Heat the water to 50-60°C, add other components, and stir for 30 minutes to obtain a polymer stabilizer.

Embodiment 3

[0016] 2-mercaptobenzimidazole 8%, hydroquinone 2.5%, sodium thiosulfate 15%, isothiazolinone 12%, glutaraldehyde 5%, isopropanol 6%, EDTA 1.5%, the rest water , heat the water to 50-60°C, add other components, and stir for 30 minutes to obtain a polymer stabilizer.

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PUM

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Abstract

A viscosity stabilizing agent used for polymer flooding is characterized by comprising components in percentage by mass as follows: 5%-8% of 2-mercapto benzimidazole, 2%-3% of hydroquinone, 10%-15% of sodium thiosulfate, 10%-15% of isothiazolinone, 5%-10% of glutaraldehyde, 6%-10% of isopropanol, 1%-2% of EDTA (ethylene diamine tetraacetic acid), and the balance of water. The viscosity stabilizing agent used for polymer flooding can improve viscosity stability of a polymer flooding system, the viscosity maintaining time is long, so that on the condition of oilfield wastewater preparation, the viscosity of the polymer flooding system maintains stable and is improved in a certain range, the field application effect of the polymer flooding is improved, the effect is remarkable, and the viscosity stabilizing agent is suitable for popularization and application.

Description

technical field [0001] The invention relates to a polymer stabilizer, in particular to a viscosity stabilizer for polymer flooding. Background technique [0002] Viscosity stabilizer is a kind of stabilizer used in polymer flooding technology in the field of tertiary oil recovery. At present, nearly one-third of wells in Daqing Oilfield are developed by polymer injection. The basic principle of EOR is to improve oil displacement efficiency, mainly through adsorption and viscosity. Polymer flooding is an important measure to increase production and stabilize production in the middle and late stages of oilfield development. Daqing Oilfield has implemented polymer flooding in blocks such as Xingyi, Xingsan and Xingshisan, and achieved good results in increasing oil production and stabilizing production. The problem of polymer flooding technology is that the viscosity of the polymer loses a lot due to mechanical degradation and biodegradation during the distribution process. Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/588
Inventor 孙志涛孙安顺
Owner DAQING HUAYING CHEM IND
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