Method for synchronous measurements on dynamic and static elastic parameters of rocks

Abstract

The invention provides a method and a device for synchronous measurements on dynamic and static elastic parameters of rocks by using a rock triaxial anti-compression testing device. The method comprises: sealing a test rock sample in a triaxial autoclave filled with hydraulic oil, applying an oil pressure by an axial pressure control system, applying a confining pressure by a confining pressure control system, and applying a pore pressure by a pore pressure control system; acquiring propagation speeds of longitudinal waves and transverse waves in the test rock sample by a computer acquisition and control system, and calculating the dynamic Young modulus and the dynamic Poisson ratio according to the propagation speeds; and acquiring deformation parameters of the test rock sample during a loading process by the computer acquisition and control system, and calculating the static Young modulus and the static Poisson ratio according to the deformation parameters. The method and the device can ensure validity and accuracy of hydrocarbon reservoir rock mechanical parameter measurements in thousands of meters deep underground and under the conditions of complex confining pressure, high temperature, high pore pressure and polyphase fluid.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a method for synchronously measuring rock dynamic and static elastic parameters by using a rock triaxial compression test device. 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 pressure (up to 200Mpa) and multiphase fluid saturation (oil, gas, water). This is v...

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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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