Method for measuring pore compression coefficient of fractured medium

Abstract

The invention discloses a method for measuring a pore compression coefficient of a fractured medium, which relates to the field of oil and gas resource development, and comprises the following steps of sampling at a fracture wall surface, and measuring axial strain delta and transverse strain delta'of a fracture sample as well as axial stress sigma corresponding to the axial strain; calculating the Young modulus Es according to the measured axial strain delta of the crack sample and the axial stress sigma corresponding to the axial strain, calculating the Poisson's ratio v according to the measured axial strain delta and transverse strain delta 'of the crack sample, and measuring the porosity of the crack surface, according to the measured and calculated porosity Young modulus Es of the crack surface and the Poisson's ratio v, calculating a pore compression coefficient. According to the method, the pore compression coefficient in the large-scale fracture deformation process can be calculated according to the compression deformation characteristics of the large-scale fracture, and good conditions are created for effective development of fracture-vug type oil and gas reservoirs. And the technical blank of the method for testing the pore compression coefficient of the large-scale fractured medium at present is filled.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a method for measuring and calculating the pore compressibility coefficient of large-scale fractured media in the development process of fracture-cavity oil and gas reservoirs. Background technique [0002] Due to the huge geological reserves, the effective development of fracture-vuggy oil and gas reservoirs can improve my country's energy structure and supplement the shortage of conventional oil and gas reservoirs in terms of geographical distribution and supply in my country. Since the pore size of the fractured media in the fractured-cavity reservoir is relatively large, usually at the millimeter level, it is basically impossible to obtain a good core sampling rate, and it is also difficult to test the pore parameters of the fractured media experimentally. However, the pore compressibility of fractured media can directly determine the elastic en...

AI Technical Summary

Problems solved by technology

However, for the pore compressibility coefficient of large-scale fractured media, neither experimental measurement nor theoretical calculation method for pore compressibility exists.

The research on the calculation of the pore compressibility coefficient of large-scale fractured media is still in the exploration aspect. No scholar has conducted experimental research, and there is no method to calculate the pore compressibility coefficient of large-scale fractured media.

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