Crack-containing shale stability evaluation device and method

Abstract

A crack-containing shale stability evaluation device mainly comprises a kettle, a temperature control assembly connected with the kettle, a pressure assembly connected with the kettle, a back pressure control assembly, a gas source supply control assembly, a liquid medium assembly connected with the kettle, a core deformation measuring assembly connected with the kettle, and a data measuring and collecting assembly, wherein the kettle is used for fixing a core and simulating the environment around the core; the temperature control assembly is controlled to heat the core, control the temperature and simulate the actual temperature of a stratum; the pressure assembly is used for exerting confining pressure, required by experiments, on the core to simulate stratum burden pressure; the back pressure control assembly is used for back pressure control of the core; the gas source supply control assembly is used for providing a constant-pressure gas source on a core inlet end; the liquid medium assembly is used for providing clean water or slurry for the core and simulating the pressure action of drilling fluid circulation; the core deformation measuring assembly is used for measuring core deformation; the data measuring and collecting assembly is connected with the assemblies and used for obtaining expansion strain, the crack core pore pressure propagation rule and pressure penetration period monitoring results.

Description

technical field [0001] The invention belongs to the technical field of well wall stability in the process of petroleum exploration and development, and relates to a device and method for evaluating the stability of mud shale with fractures. Background technique [0002] Wellbore stability in shale has always been a major difficulty in oil exploration and development. At present, with the acceleration of the strategy of exploration and development of shale gas resources in my country, researchers pay more attention to the study of the basic physical and mechanical properties of mud shale. Because the mud shale borehole stability problems and fractured mud shale leakage problems encountered in the process of shale gas exploration and development are all related to the occurrence of mud shale in the geological environment, formation fluid distribution, in-situ stress and engineering factors. The physical and mechanical properties of shale are inseparable. At present, the indo...

AI Technical Summary

Problems solved by technology

However, this simulator cannot simulate important factors affecting wellbore stability, such as the expansion strain caused by the water absorption and expansion of fractured shale in the formation environment, and the pore pressure penetration law of fractured formations.

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