Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1425-1430.doi: 10.13278/j.cnki.jjuese.20180204

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Experimental Study on Hydraulic Fracturing Physics Simulation, Crack Initiation and Propagation in Hot Dry Rock Geothermal Reservoir in Gonghe Basin, Qinghai

Zhou Zhou1, Jin Yan1, Zeng Yijin2, Zhang Xudong2, Zhou Jian2, Wang Wenzhi1, Meng Han1   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China
  • Received:2018-07-27 Published:2019-10-10
  • Supported by:
    Supported by National Key R & D Program of China (2018YFB1501802-03) and Research Foundation of China University of Petroleum (Beijing) (2462016YJRC017)

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Abstract: Hydraulic fracturing is one of the most important technical challenges in the development of hot dry rock geothermal reservoirs in Gonghe basin, Qinghai. Based on the advanced large-scale true triaxial hydraulic fracturing simulation experimental system, the authors studied the hydraulic fracture initiation and propagation in hot dry rock geothermal formations with high temperature and high pressure. The samples were from the outcrop core of Gonghe basin. According to the experimental result, the hydraulic fracture initiation and pressure could be predicted by the crack initiation model proposed in this paper. The propagation in the hot dry rock matrix has a simple extension along only with the direction of the maximum horizontal stress. The hydraulic fractures, however, are affected by natural fractures to achieve larger stimulation reservoir volume. Therefore, it is suggested that in the field, the hydraulic fracturing treatment should be in the formations rich in natural fractures so as to get a complex fracture network for geothermal energy extracting.

Key words: hot dry rock, hydraulic fracturing, initiation model, fracture propagation, Gonghe basin, reservoirs, geotherm

CLC Number: 

  • P314.9
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