Method and device for restoring underground in-situ model of rock mass mechanics in oil and gas reservoirs

Abstract

The invention provides a synchronous measurement method and apparatus for dynamic and static rock mechanical parameters changing with confining pressure, pore pressure, temperature and fluid. The method comprises the following steps: acquiring static rock mechanical parameters by using a static measuring method and acquiring dynamic rock mechanical parameters by using a dynamic measuring method, wherein the static rock mechanical parameters and the dynamic rock mechanical parameters are obtained through synchronous measurement; calculating a dynamic-static difference ratio of rock mechanical parameters based on the static rock mechanical parameters and the dynamic rock mechanical parameters; and restoring a rock mechanical underground in situ model for an oil and gas reservoir based on the static rock mechanical parameters, the dynamic rock mechanical parameters and the dynamic-static difference ratio of the rock mechanical parameters. With the method and apparatus provided by the invention, effectiveness and accuracy of restoration of the rock mechanical underground in situ model for the oil and gas reservoir 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 depth of the formation 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 Under the conditions of high pore pre...

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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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