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Open AccessArticle

Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

1
School of Petrochemical and Energy, Zhejiang Ocean University, Zhoushan 316022, China
2
School of Energy Resources, China University of Geosciences, Beijing 100083, China
3
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(6), 1498; https://doi.org/10.3390/en13061498
Received: 12 February 2020 / Revised: 7 March 2020 / Accepted: 14 March 2020 / Published: 22 March 2020
(This article belongs to the Section Energy Sources)
Horizontal wells with multi-stage fractures have been widely used to improve coalbed methane (CBM) production from coalbed methane reservoirs. The main focus of this work is to establish a new semi-analytical method in the Laplace domain and investigate the transient pressure behavior in coalbed methane reservoirs. With the new semi-analytical method, flow regimes of a multi-fractured horizontal well in coalbed methane reservoirs were identified. In addition, the sensitivities of fracture conductivity, diffusion model, storability ratio, inter-porosity flow coefficient, adsorption index, fracture spacing, fracture asymmetry, non-planar angle, and wellbore storage were studied. Results indicate that six characteristic flow regimes can be identified for multi-fractured horizontal wells in coalbed methane reservoirs, which are bilinear flow, first linear flow, desorption-diffusion flow, first pseudo-radial flow, second linear flow, and second pseudo-radial flow. Furthermore, the sensitivity analysis shows that the early flow is mainly determined by the fracture conductivity, the asymmetry factor, the non-planar angle, and the wellbore storage; while the desorption-diffusion flow regime is mainly influenced by the diffusion model, the storability ratio, the inter-porosity flow coefficient, the adsorption index, and the fracture spacing. Our work can provide a deep insight into the fluid flow mechanism of multi-fractured horizontal wells in coalbed methane reservoirs. View Full-Text
Keywords: coalbed methane reservoir; finite conductivity fracture; multi-fractured horizontal well; desorption; diffusion coalbed methane reservoir; finite conductivity fracture; multi-fractured horizontal well; desorption; diffusion
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MDPI and ACS Style

Tian, Q.; Cui, Y.; Luo, W.; Liu, P.; Ning, B. Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs. Energies 2020, 13, 1498.

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