Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs
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 met...
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| Format: | Article |
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MDPI AG
2020-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/6/1498 |
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| author | Qing Tian Yudong Cui Wanjing Luo Pengcheng Liu Bo Ning |
| author_facet | Qing Tian Yudong Cui Wanjing Luo Pengcheng Liu Bo Ning |
| author_sort | Qing Tian |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T19:57:05Z |
| format | Article |
| id | doaj.art-d430dad163e444e8a7b7efe7f4ae6680 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-12T19:57:05Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d430dad163e444e8a7b7efe7f4ae66802022-12-22T03:18:37ZengMDPI AGEnergies1996-10732020-03-01136149810.3390/en13061498en13061498Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane ReservoirsQing Tian0Yudong Cui1Wanjing Luo2Pengcheng Liu3Bo Ning4School of Petrochemical and Energy, Zhejiang Ocean University, Zhoushan 316022, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaSchool of Energy Resources, China University of Geosciences, Beijing 100083, ChinaResearch Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, ChinaHorizontal 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.https://www.mdpi.com/1996-1073/13/6/1498coalbed methane reservoirfinite conductivity fracturemulti-fractured horizontal welldesorptiondiffusion |
| spellingShingle | Qing Tian Yudong Cui Wanjing Luo Pengcheng Liu Bo Ning Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs Energies coalbed methane reservoir finite conductivity fracture multi-fractured horizontal well desorption diffusion |
| title | Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs |
| title_full | Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs |
| title_fullStr | Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs |
| title_full_unstemmed | Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs |
| title_short | Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs |
| title_sort | transient flow of a horizontal well with multiple fracture wings in coalbed methane reservoirs |
| topic | coalbed methane reservoir finite conductivity fracture multi-fractured horizontal well desorption diffusion |
| url | https://www.mdpi.com/1996-1073/13/6/1498 |
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