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室内水力压裂模拟实验是认识裂缝压裂机理、获取水力压裂信号的有效手段,可为进一步提高水力压裂技术在页岩气等非常规油气资源开发方面的应用提供技术支持.本文根据野外水力压裂施工工艺和微压裂地震信号监测的特点,设计并制造了大模型水力压裂模拟装置,该装置包括真三轴围压系统、水压裂系统和微压裂信号采集系统,可以实现相同或不同围压状态下的水力压裂试验,并对裂缝产生、裂缝扩展的整个物理过程进行水力压力信号和岩石压裂破裂信号的采集,形成了一套完整的微压裂实验技术.通过水力压裂实验,首次在实验室内获得了真三轴围压下大模型的水利压力和水力压裂信号的关系,为水力压裂信号的分析和压裂裂缝的定位提供了基础.
Indoor hydraulic fracturing simulation experiment is an effective way to recognize fracture fracturing mechanism and obtain hydraulic fracturing signals, which can provide technical support for further improving the application of hydraulic fracturing in unconventional oil and gas resources development such as shale gas. Hydraulic fracturing construction technology and the characteristics of micro-fractured seismic signal monitoring, a large model hydrofracturing simulation device has been designed and manufactured. The device includes a true triaxial confining pressure system, a water fracturing system and a micro fracturing signal acquisition system, which can The hydraulic fracturing test under the same or different confining pressure was carried out. The whole physical process of crack generation and crack propagation was collected with hydraulic pressure signals and fracturing signals of rock fractures, forming a complete set of micro-fracturing experimental techniques. Through the hydraulic fracturing experiment, the relationship between hydraulic pressure and hydraulic fracturing signals of the true model under true triaxial compression is obtained for the first time in the laboratory, which provides a basis for the analysis of hydraulic fracturing signals and the location of fracturing fractures.