Thermophysical and Mechanical Properties of Granite and Its Effects on Borehole Stability in High Temperature and Three-Dimensional Stress

摘要: When exploiting the deep resources, surrounding rock readily undergoes hole shrinkage, borehole collapse, and loss of circulation under high temperature pressure. A series experiments were conducted to discuss compressional wave velocity, triaxial strength, permeability granite cored from 3500 meters three-dimensional stress. In light coupling temperature, fluid, stress, we get thermo-fluid-solid model governing equation. ANSYS-APDL was also used stimulate influence on elastic modulus, Poisson ratio, uniaxial compressive permeability. results, establish a temperature-fluid-stress illustrate granite’s stability. The velocity decrease as rises, while poisson ratio increase. threshold pressure are 15 MPa 200°C, respectively. affects fracture more than collapse pressure, but both parameters rise with increase temperature. thermo-fluid-solid, greatly impacting stability, proves be good method analyze similar problems other formations.