3D Fracture Propagation Simulation and Pressure Decline Analysis Research for I-Shaped Fracture of Coalbed

Chengwang Wang, Zixi Guo (), Lifeng Zhang, Yunwei Kang, Zhenjiang You, Shuguang Li, Yubin Wang and Huaibin Zhen
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Chengwang Wang: PetroChina Coalbed Methane Company Limited, Chaoyang, Beijing 100028, China
Zixi Guo: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Lifeng Zhang: PetroChina Xinjiang Oilfield Company Development Company, Karamay 834000, China
Yunwei Kang: School of Sciences, Southwest Petroleum University, Chengdu 610500, China
Zhenjiang You: Centre for Sustainable Energy and Resources, Edith Cowan University, Joondalup, WA 6027, Australia
Shuguang Li: PetroChina Coalbed Methane Company Limited, Chaoyang, Beijing 100028, China
Yubin Wang: PetroChina Coalbed Methane Company Limited, Chaoyang, Beijing 100028, China
Huaibin Zhen: PetroChina Coalbed Methane Company Limited, Chaoyang, Beijing 100028, China

Energies, 2022, vol. 15, issue 16, 1-20

Abstract: After hydraulic fracturing, some treatments intended for production enhancement fail to yield predetermined effects. The main reason is the insufficient research about the fracture propagation mechanism. There is compelling evidence that I-shaped fracture, two horizontal fractures at the junction of coalbed and cover/bottom layer, and one vertical fracture in the coalbed have formed in part of the coalbed after hydraulic fracturing. Therefore, this paper aims at I-shaped fracture propagation simulation. A novel propagation model is derived on the basis of a three-dimensional (3D) model, and the coupling conditions of vertical fracture and horizontal fractures are established based on the flow rate distribution and the bottom-hole pressure equality, respectively. Moreover, an associated PDA (pressure decline analysis of post-fracturing) model is established. Both models complement with each other and work together to guide fracturing treatment. Finally, a field case is studied to show that the proposed models can effectively investigate and simulate fracture initiation/propagation and pressure decline.

Keywords: I-shaped fracture; fracture propagation model; pressure decline analysis; coupling conditions; numerical method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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