Application of dimethyl ether and process and device employing dimethyl ether to assist production of heavy oil

Abstract

The invention discloses application of dimethyl ether and a process and a device employing the dimethyl ether to assist the production of heavy oil. The dimethyl ether is used as a heavy oil production assistant agent for assisting the process for producing the heavy oil. The process comprises the following steps of: selecting the heavy oil production assistant agent; injecting the dimethyl ether; collecting crude oil; separating the dimethyl ether; liquefying and recovering the dimethyl ether; and recycling the dimethyl ether in a closed mode. In the process, the dimethyl ether is selected as the heavy oil production assistant agent, has extensive sources, causes no damage to a production layer, does not influence the quality of the crude oil, does not cause pollutions to the environment, can be recycled, and has high economic benefit; by injecting the dimethyl ether liquid to reduce the viscosity of the heavy oil, the efficiency of an oil pumping unit can be significantly improved, and the heavy oil recovery ratio is improved; and the process employing the dimethyl ether to assist the production of the heavy oil has convenient equipment installation, not only can be used for an individual well and an oil production platform but also can be used for an oil production block, and has very strong technology feasibility and suitability.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to the application of dimethyl ether and a process and device for assisting the exploitation of heavy oil by using dimethyl ether. Background technique [0002] As we all know, heavy oil is crude oil with high asphaltene and colloid content and high viscosity. Heavy oil refers to the viscosity of greater than 50 mPa·s under formation conditions, or the viscosity of degassed crude oil at the reservoir temperature is Heavy crude oil with a high viscosity of 1000-10000 mPa·s. Because of its high density, heavy oil is also called heavy oil. The exploitation of heavy oil is a recognized technical problem in the petroleum industry. Compared with light crude oil, the content of colloid, asphaltene and wax in heavy oil is higher, and the content of hydrocarbons is even lower than 50%, which makes the crude oil form a relatively stable oil. colloidal dispersion system. Ther...

AI Technical Summary

Problems solved by technology

[0004] The use of oil reservoir heating consumes a lot of energy and is poor in economy; the source of thin oil is limited, especially in heavy oil blocks, and there is no thin oil available; the active aqueous solution is injected into the well, and the active aqueous solution is mixed with the heavy oil in the well by mechanical action to form Unstable, low-viscosity oil-in-water emulsion, complicated process, and increased follow-up processing workload

These techniques have obvious defects, thus limiting the development and application

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