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Polymer viscosity stabilizer

A viscosity stabilizer, polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of large polymer viscosity loss, oil recovery rate decline, viscosity reduction, etc. The effect of increasing seepage resistance and improving viscosity stability

Active Publication Date: 2014-03-26
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problem of polymer flooding technology is that the viscosity of the polymer is greatly lost due to mechanical degradation and biodegradation during the distribution process, and the viscosity stability of the polymer aqueous solution directly affects its oil displacement effect. Reduced viscosity leads to reduced oil recovery

Method used

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  • Polymer viscosity stabilizer
  • Polymer viscosity stabilizer
  • Polymer viscosity stabilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0013] 40% thiourea, 20% sodium sulfite, 10% EDTA, and the remaining water. Heat the water to 50-60°C, add other components, and stir for 30 minutes to obtain a polymer viscosity stabilizer.

Embodiment 2

[0015] 50% thiourea, 30% sodium sulfite, 5% EDTA, and the rest of water. Heat the water to 50-60°C, add other components, and stir for 30 minutes to obtain a polymer viscosity stabilizer.

Embodiment 3

[0017] 45% thiourea, 25% potassium sulfite, 10% EDTA, and the remaining water. Heat the water to 50-60°C, add other components, and stir for 30 minutes to obtain a polymer viscosity stabilizer.

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Abstract

The present invention provides a polymer viscosity stabilizer, which comprises, by mass, 40-50% of thiourea, 20-30% of sulfite, 5-10% of EDTA, and the balance of water, wherein the sulfite is sodium sulfite, potassium sulfite or ammonium sulfite, and the polymer viscosity stabilizer is prepared by using a mixing stirring process, and is applied in the polymer flooding tertiary oil recovery process. With the polymer viscosity stabilizer, viscosity stability of the sewage polymer solution can be improved, the viscosity stabilizing time is long, the seepage resistance of the sewage polymer solution can be increased, the rheology control capability of the sewage polymer solution can be improved, and the polymer flooding oil increase effect can be increased.

Description

technical field [0001] The invention belongs to the field of polymer stabilizers, in particular to a polymer viscosity stabilizer. Background technique [0002] Viscosity stabilizer is a kind of stabilizer used in polymer flooding technology in the field of tertiary oil recovery. The basic principle of using polymer injection technology to enhance oil recovery is to inject polymer into the oil layer according to the difference in the mobility ratio of oil and water in the rock formation. The viscosity of the polymer is very high, which can block large pores and prevent formation water from flowing to the oil well. , and can drive and carry crude oil to the bottom of the well, thereby enhancing the recovery of crude oil. At present, the problem of polymer flooding technology is that the viscosity of the polymer is greatly lost due to mechanical degradation and biodegradation during the distribution process, and the viscosity stability of the polymer aqueous solution directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/588
CPCC09K8/588
Inventor 胡玉国梁海臣李靖张冠洲张有强肖劲松赵兴君
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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