A Calculation Method of Rock Compressibility Coefficient

Abstract

The invention provides a rock compressibility coefficient calculation method, comprising the following steps of measuring the permeability of rocks under different effective overlying pressures, calculating the porosity of rock samples corresponding to effective overlying pressures; calculating the porosity of rock samples corresponding to effective overlying pressures Pore ​​volume; calculate the compressibility coefficient of the rock sample corresponding to the effective overburden pressure. The present invention calculates the rock compressibility coefficient according to the measurement results of rock permeability under different effective overlying pressures, the calculated rock compressibility coefficient is close to the measured rock compressibility coefficient, and the calculation result is reliable, and the method of the present invention can solve the problem that the current measured compressibility coefficient method is affected by the skin problem of effects.

Description

Technical field [0001] The present invention belongs to the field of oil and gas engineering, particularly to a rock compressibility coefficient calculation method. Background technique [0002] Rock Compressibility size reflects how much elastic energy of rock reserves, to accurately determine the compression factor reservoir reservoir rock is an important prerequisite for accurate assessment of the size of the elastic energy reservoirs. [0003] Currently, the method for determining rock compressibility assay laboratories, the elastic modulus method, empirical formula and dynamic analysis. Due to large surface pores of rock samples, rock compressibility measurement process produces skin effect, thereby resulting in generally high in the laboratory measurement results. The Elastic Modulus is a method of rock elastic modulus and Poisson's ratio calculating rock compression factor, this method can not calculate the compressibility factor under different effective rock overburden p...

AI Technical Summary

Problems solved by technology

The empirical formula method is an empirical relational formula established by statistical methods based on laboratory measurement data. Since there are many factors affecting the rock compressibility coefficient, the empirical formula method does not have universal applicability.

The dynamic analysis method is based on the dynamic monitoring data in the production process, using the relational formula established by the principle of material balance. This method is highly dependent on the dynamic monitoring data, and its scope of application is limited.

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