Oil-gas interface tension test method in porous medium

Abstract

The invention provides an oil-gas interface tension test method in a porous medium, comprising the following steps: A, performing a displacement experiment in a sample formed by the porous medium to obtain an oil-gas sample; and B, performing the chromatographic analysis on the obtained oil-gas sample to obtain an oil-gas chromatographic component and obtaining the oil-gas interface tension in the porous medium by the oil-gas chromatographic component. The oil-gas interface tension test method has the following advantages: 1, the natural porous medium is used as a test medium to really reflect the oil-gas interface interaction rule under the oil reservation condition; 2, a stratum oil dissolubility calculation formula is derived using the Peng-Robinson equation of state (PR-EOS) in combination with dissolubility theory in the calculation method and applied to the interface force tension calculation; 3, the direct, real interface tension data is provided to design and optimize a scheme of an oil reservation engineering project; and 4, the tension on different cross sections of the natural porous medium is researched to make it possible to research the change in the interface tension field in the natural porous medium from now.

Description

technical field [0001] The invention relates to the field of petroleum high-pressure physical property experiments, in particular to a method for testing the interfacial tension of oil and gas in porous media. Background technique [0002] With the continuous expansion of the field application scale of gas flooding technology at home and abroad, how to accurately and truly obtain the interfacial tension value of oil and gas in the reservoir has become the key for petroleum engineers to solve many technical problems of oil displacement. At present, the test method of interfacial tension of oil and gas is mainly the pendant drop test method. interfacial tension value. [0003] This method is similar to testing phase parameters such as bubble point and dew point in a PVT instrument, without the participation of porous media, the intermolecular force between oil and gas interfaces is different from the intermolecular force in porous media, and cannot be accurately measured. Re...

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Problems solved by technology

[0004] The present invention aims to provide a method for testing oil-gas interfacial tension in porous media to solve the problem that existing oil-gas interfacial tension testing methods cannot faithfully reflect the influence of porous media on oil-gas interfacial tension and cannot truly measure oil-gas under actual reservoir conditions. The question of interfacial tension value

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