A viscosity-reducing oil displacement agent and oil displacement system suitable for heavy oil reservoirs

A technology of viscous oil displacement agent for heavy oil reservoirs, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of poor anti-calcium and magnesium ions, large amount of surfactants, limitations, etc., and achieve improvement Oil displacement efficiency, good salt resistance, and the effect of reducing viscosity
CN109135709BActive Publication Date: 2020-10-13CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2020-10-13

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Abstract

The invention discloses a viscosity-reducing oil-displacing agent applicable to thick oil reservoirs. The viscosity-reducing oil-displacing agent is prepared from a nonionic surfactant, a cationic oligomeric surfactant, C1-C6 organic micromolecular alcohol and water. The cationic oligomeric surfactant is selected from a compound shown in a structural formula (I), wherein R refers to C4-C18 alkyl,and X is selected from one or more of F<->, Cl<->, Br<-> and I<->. The invention further discloses viscosity-reducing oil-displacing agent-polymer system applicable to the thick oil reservoirs. The system comprises the viscosity-reducing oil-displacing agent, polyacrylamide in molecular weight of 8,000,000-2000,000,0 and water. The viscosity-reducing oil-displacing agent is capable of remarkably reducing oil-water interfacial tension and has great viscosity reducing and emulsifying effects on thick oil. The viscosity-reducing oil-displacing agent-polymer system is capable of improving a water-oil mobility ratio, sharply reducing viscous force of the thick oil in rock pores, effectively improving oil displacing efficiency and improving thick oil recovery efficiency.
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Description

technical field

[0001] The invention relates to a viscosity-reducing oil-displacement agent and an oil-displacement system suitable for heavy oil reservoirs, in particular to a viscosity-reducing oil-displacement agent and an oil-displacement system containing a specific cationic oligomeric surfactant. Background technique

[0002] As the demand for oil continues to rise, marginal heavy oil and bitumen reservoirs that were previously thought to have no exploitation value have become effective resources with economic value. Heavy oil contains more colloids and asphaltenes, has high viscosity, poor fluidity, is difficult to mine, and has a low recovery factor.

[0003] Polymer flooding is a commonly used recovery technology for heavy oil reservoirs. This technology increases the viscosity of the water phase by dissolving polymers in water, thereby reducing the mobility ratio and increasing the water flooding sweep coefficient. Although polymer flooding has a significant oil-i...

Claims

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