Coal rock secondary hydraulic fracturing test method in true triaxial state

The invention discloses a coal-bed gas well secondary fracturing test method in a true triaxial state. The method comprises the following steps: preparation of a test piece, installation of a simulated shaft, installation of a test piece, loading, primary hydraulic fracturing, primary data collection, secondary hydraulic fracturing, and secondary data collection. The invention relates to the fieldof exploration, and provides the coal-bed gas well secondary fracturing test method in the true triaxial state. The method overcomes deficiencies of existed simulation methods, the secondary fracturing process is more accurately simulated and crack form of secondary fracturing is predicated, the method improves reconstruction efficiency of domestic coal-bed gas wells, gas well production power isimproved, and draining cost is reduced. 本文公布了种真三轴状态下的煤层气井二次压裂试验方法，包括如下步骤：准备试件、安装模拟井筒、安装试件、加载、初次水力压裂、初次采集数据、二次水力压裂和二次采集数据。本文涉及勘探领域，提供了种真三轴状态下的煤层气井二次压裂试验方法，克服现存的模拟方法的不足，更为准确地模拟二次压裂过程并预测二次压裂的裂缝形态，有助于提高国内煤层气井的改造效率，提高气井产能，降低排采成本。