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

Active Publication Date: 2020-10-13
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The oil displacement systems mentioned above all use conventional anionic or nonionic surfactants or a combination of the two. The ability of calcium and magnesium ions is relatively poor, which is limited in the application of heavy oil reservoirs

Method used

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

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with embodiment. However, the scope of the present invention is not limited to the following examples. Those skilled in the art can understand that various changes and modifications can be made in the present invention without departing from the spirit and scope of the present invention.

[0024] The instruments, reagents, materials, etc. involved in the following examples, unless otherwise specified, are conventional instruments, reagents, materials, etc. in the prior art, and can be obtained through formal commercial channels. The experimental methods, detection methods, etc. involved in the following examples, unless otherwise specified, are conventional experimental methods, detection methods, etc. in the prior art.

[0025] Embodiment Viscosity-reducing oil displacement agent and its application

[0026] The nonionic surfactant, cationic oligomeric surfactant, C 1 ~C 6 The organic small molecu...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 曹绪龙秦冰石静高敏祝仰文乔富林于群江建林王红艳潘斌林
Owner CHINA PETROLEUM & CHEM CORP
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