Influence of natural fractures on the propagation of hydraulic fractures in hot dry rock

被引：0
|
作者：
Xie Z. [1 ]
Huang Z. [1 ]
Xiong J. [2 ]
Wu X. [1 ]
Li G. [1 ]
Zou W. [1 ]
Long T. [1 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting//China University of Petroleum, Beijing
[2] Sinopec Jiangsu Oilfield Company, Yangzhou
来源：
Natural Gas Industry | 2022年 / 42卷 / 04期
关键词：
Fracture conductivity; Fracture propagation; Fracturing initiation pressure; Hot dry rock; Hydraulic fracture; Natural fracture; Permeability coefficient; True triaxial hydraulic fracturing;
D O I：
10.3787/j.issn.1000-0976.2022.04.006
中图分类号：
学科分类号：
摘要：
Geothermal energy is a clean and environmentally friendly renewable energy source and it is characterized by low carbon, environment protection, stability and high efficiency. Hydraulic fracturing is an important method to develop geothermal resources of hot dry rock (HDR) efficiently. At present, however, the influence of natural fractures on the propagation of hydraulic fractures during the hydraulic fracturing of high-temperature granite is not studied extensively and the propagation laws of hydraulic fractures are not clarified yet. Taking a common type of HDR (granite) as the research object, true-triaxial hydraulic fracturing experiments under high temperature in real time was conducted. The propagation characteristics and conductivity of fractures in two types of granites under different temperatures were analyzed, the propagation laws of hydraulic fractures in HDR under the influence of natural fractures were revealed, and the fracture conductivity after fracturing was evaluated. With the increase of granite temperature, the fracturing initiation pressure decreased, but the tortuosity of fracture surface increased and the propagation paths of hydraulic fractures got more random. The fracture conductivity after the fracturing of granite varied with temperatures. With the increase of granite temperature, the conductivity of hydraulic fractures also increased. Under the same situation, the fracturing initiation pressure of fractured granites was lower than that of tight granites and the fracture conductivity of fractured granites after fracturing was greatly higher than that of tight granites.
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页码：63 / 72
页数：9
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