A rapid indoor evaluation method for oil removal effect of oil displacing agent

Abstract

The invention relates to a method for quickly evaluating the oil washing effect of an oil displacement agent indoors. The method is used for evaluating the oil washing effect of the oil displacement agent on crude oil of a target oil reservoir, and comprises the following steps: selecting quartz sand or natural sand in the corresponding grain size range according to the reservoir permeability Ka of the target oil reservoir; measuring the added value of the oil washing efficiency of the oil displacement agent on oil sand which is prepared by mixing the crude oil or simulated oil of the target oil reservoir and the quartz sand or natural sand; and evaluating the oil washing effect of the oil displacement agent on the target oil reservoir according to the added value of the oil washing efficiency. According to the method for quickly evaluating the oil washing effect of the oil displacement agent indoors, provided by the invention, the oil washing efficiency of the oil displacement agent in the oil reservoir can be evaluated quickly and accurately.

Description

technical field [0001] The invention relates to an indoor rapid evaluation method for the oil washing effect of an oil displacement agent, which belongs to the technical field of petrochemical industry. Background technique [0002] As the most important technology for tertiary oil recovery, chemical composite flooding has been shown to greatly enhance oil recovery by domestic and foreign research. The three-component compound flooding is now being popularized and applied, and the two-component compound flooding has entered the pilot test stage of the mine. While popularizing ASP flooding, major domestic oil companies have also deployed a number of binary flooding test blocks. It is urgent to evaluate and screen out surfactants with excellent performance for ASP flooding. The separate evaluation of oil washing efficiency, especially lacks a quick and feasible evaluation method. [0003] In chemical compound flooding, the oil washing performance of surfactants is directly r...

AI Technical Summary

Problems solved by technology

In the previous methods and standards, the oil displacement effect of the oil displacement agent was evaluated by the physical simulation experiment of the core to determine the oil displacement efficiency. Each set of experiments took a long time, and the price of the Bailey core with good homogeneity (imported from the United States) was high, which was inconvenient. Comparative Experiment

[0004] Due to the lack of oil washing efficiency indicators in the industry standards of various domestic oil companies, each oilfield uses its own different evaluation indicators and evaluation methods to screen the surfactants for composite flooding, and lacks a unified and standardized rapid evaluation method, which leads to field tests. The quality control of surfactant products is difficult to be effective, which seriously restricts the promotion and smooth development of field tests

Domestic scholars Yao Tongyu and others reported in their research papers that by measuring the contact angle, interfacial tension and adhesion work of the oil displacement agent, the parameters such as the adhesion work factor, the interfacial tension factor and the wettability factor were calculated to indirectly evaluate the oil displacement agent. This method creatively proposes the concept of three factors, but as a method to evaluate the oil removal effect of oil displacement agents, the test is relatively troublesome, and it is an indirect method, and the effect level has not been systematically explored and stipulated.

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