Development and application of a real-time high-temperature and high-stress true triaxial fracturing test system
GUO Wuhao1, 2, GUO Yintong1, 2, CHANG Xin1, 2, WU Mingyang1, 2, HE Yuting1, 2, BI Zhenhui1, 2, ZHANG Xinao1, 2, TENG Shilong1, 2, WANG Lei1, 2, YANG Chunhe1, 2
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract： To investigate the initiation and propagation of fractures in deep oil, gas, and geothermal energy reservoir stimulation, an independently developed real-time high-temperature and high-stress true triaxial fracturing test system was created. This system bridges the gap between laboratory fracturing simulations and actual deep reservoir conditions. It is designed to simulate the fracturing and fracture propagation behavior of 300 mm cubic rock samples under in-situ deep reservoir conditions. The system monitors and processes parameters such as stress, displacement, pump pressure, flow rate, and acoustic emission signals during fracture propagation. The maximum stress in the X, Y, and Z directions can reach 88 MPa, and the internal temperature of the sample can be heated to 350 ℃. The intelligent temperature control mode ensures uniform heating of the entire sample, and the maximum pump pressure is 210 MPa when slickwater is used as the fracturing medium (120 MPa with supercritical CO2). The system has successfully conducted hydraulic fracturing tests of shale and supercritical CO2 fracturing tests of granite under high-temperature and high-stress conditions. The test results demonstrate high accuracy and good stability. Under high-stress conditions, post-peak fluctuations in the pump pressure curve are intensified. High temperatures reduce breakdown pressure and increase fracture complexity. When supercritical CO2 is used as the fracturing medium, the breakdown pressure of granite significantly decreases, the number and energy level of acoustic emission signals weaken, and fracture complexity increases. These findings provide theoretical and technical support for optimizing deep reservoir reconstruction technology.
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2025, Vol. 44 
