Reservoir dynamic evolution and drainage optimization in deep saturated coalbed methane of Shenfu Block
4 affiliations
- 1School of Energy Resources, China University of Geosciences (Beijing), Beijing, China
- 2China United Coalbed Methane Corp., Ltd., Beijing, China
- 3Researh Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an, China
- 4Shanxi Coal Geological Investigation and Research Institute CO., Ltd., Taiyuan, China
Abstract
China possesses vast deep coalbed methane (CBM) resources, However, the dynamic evolution of reservoir pressure and permeability during the production process remains unclear, which restricts their efficient development. This study conducted to reveal the dynamic evolution of coal reservoir pressure and permeability under different production rates and its influence on the productivity of deep saturated CBM wells, so as to provide a theoretical basis for efficient development. Based on actual production data from deep saturated CBM vertical wells in the Shenfu Block, and considering positive and negative effects on coal reservoirs during drainage, this study utilizes reservoir pressure and permeability prediction models and derives from production dynamics to characterize the variations of reservoir pressure and permeability under different drainage rates, and analyzes their impacts on well productivity. The gas production curves of deep saturated CBM wells in the Shenfu Block can be classified into two types: decline type and stable type. The results show that the initial pressure drop rate is the key factor leading to productivity differentiation. Stable-type wells exhibit a lower initial pressure drop rate, a wider propagation range of reservoir pressure, and a permeability improvement of 5.4%, enabling sustained and efficient CBM production. In contrast, decline-type wells experience an excessively rapid initial pressure drop rate, resulting in slow reservoir pressure decline, limited permeability enhancement of only 0.9%, and a significant drop in productivity at later stages. To achieve high and stable production of deep saturated CBM wells, a strategy of “slow drainage and controlled pressure” should be adopted. It is recommended to control the bottomhole flowing pressure drop rate within 160 kPa/d during the initial production stage; appropriately increase the rate by 50–100 kPa/d during the gas production increase stage to promote gas desorption; and adjust it back to around 50 kPa/d during the later decline stage to maintain production.
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BibTeX
@article{wang2026reservoir,
title = {{Reservoir dynamic evolution and drainage optimization in deep saturated coalbed methane of Shenfu Block}},
author = {Ya juan Wang and Hao Xu and Yi nan Liu and Yan cheng Liu and Heng Wu and Ding Liu and Xiao zhuo Wu and Yu Dong and Xue jing Song and Jin wei Wang},
journal = {PLOS One},
year = {2026},
month = oct,
doi = {10.1371/journal.pone.0360289},
url = {https://doi.org/10.1371/journal.pone.0360289},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Reservoir dynamic evolution and drainage optimization in deep saturated coalbed methane of Shenfu Block
AU - Ya juan Wang
AU - Hao Xu
AU - Yi nan Liu
AU - Yan cheng Liu
AU - Heng Wu
AU - Ding Liu
AU - Xiao zhuo Wu
AU - Yu Dong
AU - Xue jing Song
AU - Jin wei Wang
PY - 2026
DA - 2026/10/14
JO - PLOS One
DO - 10.1371/journal.pone.0360289
UR - https://doi.org/10.1371/journal.pone.0360289
AB - China possesses vast deep coalbed methane (CBM) resources, However, the dynamic evolution of reservoir pressure and permeability during the production process remains unclear, which restricts their efficient development. This study conducted to reveal the dynamic evolution of coal reservoir pressure and permeability under different production rates and its influence on the productivity of deep saturated CBM wells, so as to provide a theoretical basis for efficient development. Based on actual production data from deep saturated CBM vertical wells in the Shenfu Block, and considering positive and negative effects on coal reservoirs during drainage, this study utilizes reservoir pressure and permeability prediction models and derives from production dynamics to characterize the variations of reservoir pressure and permeability under different drainage rates, and analyzes their impacts on well productivity. The gas production curves of deep saturated CBM wells in the Shenfu Block can be classified into two types: decline type and stable type. The results show that the initial pressure drop rate is the key factor leading to productivity differentiation. Stable-type wells exhibit a lower initial pressure drop rate, a wider propagation range of reservoir pressure, and a permeability improvement of 5.4%, enabling sustained and efficient CBM production. In contrast, decline-type wells experience an excessively rapid initial pressure drop rate, resulting in slow reservoir pressure decline, limited permeability enhancement of only 0.9%, and a significant drop in productivity at later stages. To achieve high and stable production of deep saturated CBM wells, a strategy of “slow drainage and controlled pressure” should be adopted. It is recommended to control the bottomhole flowing pressure drop rate within 160 kPa/d during the initial production stage; appropriately increase the rate by 50–100 kPa/d during the gas production increase stage to promote gas desorption; and adjust it back to around 50 kPa/d during the later decline stage to maintain production.
SN - 1932-6203
ER -