Phase Behavior of Fluid Composition in Coalbed Methane Wells Pre- and Post-Workover: An Examination of the Panzhuang Block, Qinshui Basin, Shanxi, China
Source abstract
Abstract
Workover operations significantly impact the service life and gas production capacity of coalbed methane (CBM) wells and are crucial for optimizing resource exploitation. To investigate workover operations’ impact on coal seam reservoirs, the authors designed a series of experiments and obtained the following results: (1) The workover operation induced a phase transition in the solid-liquid composition produced by the CBM well, indicating changes in the coal reservoir’s internal structure. (2) During the stable production stage before and after the workover, the proportion of Na+, Cl−, Ca2+, and Total Dissolved Solids (TDS) in the water samples showed a downward trend as a whole, while the HCO3−; after the workover, the Na+, Cl−, Ca2+, and TDS all increased suddenly, while the HCO3− decreased. (3) While inorganic minerals predominated in the precipitation material during the stable production stage pre-workover, their proportion decreased post-workover, with a noticeable shift in their qualitative composition. (4) It is an indisputable fact that workover operations cause physical and chemical damage to coal seam reservoirs. During workover operation, how to avoid damage and conduct benign reconstruction to the reservoir will be the direction of our future efforts. The experimental results provide valuable insights that can guide the optimization of CBM workover operations and inform the strategic planning of subsequent drainage activities.
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Research context
OpenAlex topics: Coal Properties and Utilization · Hydrocarbon exploration and reservoir analysis · Hydraulic Fracturing and Reservoir Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Jinshui East Road No. 136, Zhengzhou 450045, China
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Research Center for Strategy of Global Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Funding
Geology and Mineral Resources Survey Project · Basic Science Center Project for National Natural Science Foundation of China · General Project of Henan Natural Science Foundation
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