Method and device for recovering oil and gas reservoir rock mechanics underground in-situ model

Abstract

The invention provides a method and a device for recovering an oil and gas reservoir rock mechanics underground in-situ model. The method comprises the following steps of: measuring rock mechanics parameters of an oil and gas reservoir; counting rock mechanics property influence parameters of the oil and gas reservoir; calculating the anisotropy strength of the rock mechanics parameters; obtaining a correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir; obtaining a correlation between the rock mechanics property influence parameters and the anisotropy strength; and recovering the oil and gas reservoir rock mechanics underground in-situ model by adopting the rock mechanics parameters, the anisotropy strength of the rock mechanics parameters, the correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir and the correlation of the rock mechanics property influence parameters and the anisotropy strength. By the method, the effectiveness and the accuracy for recovering the oil and gas reservoir rock mechanics underground in-situ model can be improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a method for restoring an underground in-situ model of rock mass mechanics in an oil and gas reservoir, and a device for restoring an in-situ underground model of rock mass mechanics in an oil and gas reservoir. Background technique [0002] Oil and gas reservoir rock mass is a geological entity composed of a series of structural planes and structural bodies at a certain depth, at a certain temperature and pressure, and saturated with a certain amount of fluid by the porous medium material of the reservoir rock mass and its upper and lower surrounding rocks. Compared with near-surface engineering geology, it is generally buried deeper (the formation depth is generally several thousand meters), and it is under higher triaxial complex confining pressure (up to 200MPa), higher temperature (up to 200°C) and higher High pore pressure (up to 200Mpa) and multip...

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Problems solved by technology

[0003] For oil and gas reservoir rock mass with complex confining pressure, high temperature, high pore pressure, and multiphase fluids at depths of thousands of meters underground, the traditional static mechanical properties research is to drill cores under surface conditions and use triaxial stress A tester or an acoustic wave tester is used to conduct mechanical experiments on the cores taken out, such as taking the drilled cores to the ground laboratory at room temperature, normal pressure, and dry samples, or considering applying different confining pressures, or considering filling different saturated fluids for testing. Rock mechanics experiments, obviously, the rock mechanics parameters obtained by this prior art cannot fully represent the mechanical properties of oil and gas reservoirs under the conditions of underground high temperature, high pressure, high pore pressure, and multiphase saturated fluid, that is, it cannot guarantee Validity and accuracy of rock mass mechanical parameters in oil and gas reservoirs with complex confining pressure, high temperature, high pore pressure and multiphase fluids at depths of meters

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