Progress and development directions of shale oil reservoir stimulation technology of China National Petroleum Corporation

LEI Qun,WENG Dingwei,XIONG Shengchun,LIU Hanbin,GUAN Baoshan,DENG Qiang,YAN Xuemei,LIANG Hongbo,MA Zeyuan

Table 1 Monitoring methods and results used by shale oil and gas field laboratory test in North American.

Project name Monitoring methods Understandings HFTS DFIT for 4 wells, wall coring, core analysis, proppant tracer for 3 wells, fracturing fluid tracer for 8 wells, micro-seismic, inclinometer, bottom hole pressure gauge, coring of large deviation well at 182 m (1) The fracture complexity beyond that of current numerical simulation modeling. (2) Tensile fractures and shear fractures coexist; the support fractures are only about 10 m high. (3) There is a large amount of unbroken small-grain quartz sand on the fracture surface of the core. Large fractures 0.5 to 1.0 cm wide filled with quartz sand are commonly present in the cores. (4) Energy spectrum logging analysis indicates that more than 90% of the clusters are stimulated MSEEL Well wall coring, core analysis, micro-seismic monitoring, DTS/DAS, production logging, vertical well coring at 34 m (1) Cores taken from vertical wells have natural fractures, induced fractures, and horizontal bedding; (2) A large amount of slow slips occur during the fracturing process; (3) DTS shows that the temperature of the fractured stage would rapidly recover to the reservoir temperature Conoco-Phillips Eagle Ford pilot test Dual well micro-seismic, DTS/DAS, bottom hole pressure gauge, tracer, radioactive proppant, coring from Well S2 at 61 m, coring from Well S3 at 110 m (1) There are a large number of hydraulic fractures, far exceeding the number of perforation clusters; the fracture complexity is related to the cluster spacing; beddings and weak surfaces, etc. affect the fracture complexity. (2) DTS/DAS show that all clusters contain fluid, but not uniform in volume. (3) Density of fractures in core is not directly related to micro-seismic events. (4) DAS shows that some of the fractures are 457 m long, and the fractures extend upward to the Buda Formation and downward to the Austin Formation.