Experimental Study on Fiber Strain Evolution Induced by Multi-Fracture Propagation in Hydraulic Fracturing
The propagation morphology of fractures in hydraulic fracturing process with optical fiber monitoring remains unclear.In this regard,a physical simulation test method for hydraulic fracturing based on fiber strain moni-toring was presented.A distributed optical fiber demodulator based on optical frequency domain reflectometer(OFDR)was combined with large-scale true triaxial fracturing physical simulation test to perform physical simulation test of optical fiber real-time monitoring on hydraulic fracturing of artificial and shale samples.The test results show that the distributed optical fiber sensing technology based on OFDR can monitor the evolution of strain with fine spa-tial resolution and high precision,and the strain data of the optical fiber can clearly reflect the initiation,expansion,and closure of fractures.Moreover,a hydraulic fracture morphology discrimination criterion based on fiber strain sensing was presented based on the test results,which can determine the types of some fractures based on the fiber strain evolution information.The research conclusions can efficiently guide the interpretation of on-site distributed fi-ber data,can providing reference for large-scale field application of optical fiber monitoring of fracturing.
万方数据
维普
