Rock compression coefficient calculation method

Abstract

The invention provides a rock compression coefficient calculation method. The rock compression coefficient calculation method comprises the following steps of: measuring the permeability of rock underdifferent effective overburden pressures, and calculating the porosities of rock samples under the corresponding effective overburden pressures; calculating the pore volumes of the rock samples underthe corresponding effective overburden pressures; and calculating the compression coefficients of the rock samples under the corresponding effective overburden pressures. According to the method, therock compression coefficients are calculated according to the measurement results of the rock permeability under different effective overburden pressures, the calculated rock compression coefficientsare close to the actually measured rock compression coefficients, the calculation result is reliable, and the method can solve the problem that an existing actually measured compression coefficient method is affected by the skin effect.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas engineering, and in particular relates to a calculation method for rock compressibility coefficient. Background technique [0002] The compressibility coefficient of rock reflects the amount of elastic energy contained in the rock. Accurately determining the compressibility coefficient of reservoir rock in oil and gas reservoirs is an important prerequisite for accurately evaluating the elastic energy of oil and gas reservoirs. [0003] At present, the methods for determining rock compressibility include laboratory measurement method, elastic modulus method, empirical formula method and dynamic analysis method. Due to the large number of pores on the surface of the rock sample, the skin effect will occur in the process of determining the rock compressibility coefficient in the laboratory, resulting in generally high measurement results. The elastic modulus method is a method to calculate ...

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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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