Pore-scale mechanisms and hysteresis effect during multi-cycle injection and production process in underground hydrogen storage reservoir

Gao, Jidong; Kong, Debin; Peng, Yingfeng; Zhou, Yunzhu; Liu, Yuwei; Zhu, Weiyao

doi:10.1016/j.energy.2023.129007

Cited by 12 publications

(1 citation statement)

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“…However, the focus of CBM development is primarily on the high-rank and middle-rank seams. A prime example of a high-rank CBM field is located in the southern Qinshui Basin of Shanxi Province (Bustin, 1997;Chen et al, 2016;Gao et al, 2023b;Qiu et al, 2023). In recent years, scholars have conducted comprehensive research on the geological background, physical properties of CBM reservoirs, resource evaluation, reservoir formation mechanisms, and production potential in the Qinshui Basin.…”

Section: Introductionmentioning

confidence: 99%

Production characteristics and influencing factors of coalbed methane wells: a case study of the high-ranking coal seam in the southeastern Qinshui Basin, China

Chen,

Gao,

Wang

2024

Front. Earth Sci.

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This study focuses on coalbed methane (CBM) wells in high-ranking coal seam as the research subject. Considering the influence of effective stress and matrix shrinkage, a comprehensive permeability calculation model for CBM reservoirs is established. Based on this model, the variations in pressure and permeability during well production are quantified. By integrating static geological parameters, a finely classified classification of CBM wells is achieved using self-organizing map (SOM) neural network. Subsequently, an analysis of production dynamic characteristics and productivity differences among different types of CBM wells is performed, followed by providing drainage optimization suggestions. The results of SOM analysis show that 7,000 m3/d and 1,500 m3/d can be used as the production boundaries for the wells with different productivity in Block P. The daily gas production of exceptional well exceeds 7,000 m3/d, and the permeability remains relatively stable throughout the drainage process of this well. The daily gas production of the potential well ranges from 1,500 to 7,000 m3/d, and the permeability exhibits a significant decrease during the drainage process. The daily gas production of Inefficient well is consistently below 1,500 m3/d with moderate permeability variation. In addition to well location and structural geology, production variability is also influenced by the matching of reservoir conditions and drainage systems. This is primarily manifested in discontinuous drainage systems and rapid decline in bottom hole pressure (BHP) during early production. The analysis of drainage parameters indicates that in order to achieve optimal production from CBM wells, the BHP should exhibit an initial rapid decline followed by a slowly decrease during the early production period, with an average pressure drop ranging from 0.005 to 0.02 MPa/d. The research findings can offer technical guidance for the future advancement of CBM in the P Block.

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Section: Introductionmentioning

confidence: 99%