Geological adaptability of deep CBM fractured horizontal well in SLN block

Fu, Yutong; Yuan, Weilin; Xu, Zhao‐Dong; Zhao, Ruosi; Wu, Yue; Zheng, Huaiping; Wang, Xianqing; Guo, Xudong; Gou, Shiyong; Ma, Chunlan

doi:10.3389/feart.2023.1127995

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Moreover, the gas saturation is 1.4 times higher, the coal reservoir pressure is 2.6 times greater, and the permeability is 2 orders of magnitude lower than that of the middle-shallow coal seam. Deep coal reservoirs boast high gas content and saturation, 26 coupled with characteristics such as high temperature, high pressure, ultralow permeability, 27 and robust coal structure.…”

Section: Geological Setting and Development Status Of The Dj Blockmentioning

confidence: 99%

Dynamic Production Characteristics of Deep Coalbed Methane: A Case Study of Daning-Jixian Block

Zhang,

Lai,

Meng

et al. 2024

Energy Fuels

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The Daning-Jixian block, located in the eastern margin of the Ordos Basin, is abundant in deep coalbed methane (CBM) resources and serves as a pilot test block for deep CBM development in China. Currently, the exploration and development of a deep CBM are in the early stages. The production characteristics and development laws across different production stages are not fully elucidated, leading to uncertainties in discharge and production control measures as well as the optimization of the production system. This study addresses these challenges by analyzing actual production data from deep CBM wells. It establishes a classification standard for deep CBM wells and a production stage model diagram. Based on this, it compares and analyzes the production characteristics of deep CBM wells with middle and shallow CBM wells as well as the variations among different types of deep CBM wells. The findings reveal the following key points: (1) gas wells are categorized as low-, medium-and high-production wells based on average daily gas production of 1500 and 3000 m 3 /d, respectively; (2) deep CBM production is delineated into four stages: gas production rise, gas production decline, stable gas production, and gas production depletion; (3) in contrast to middle and shallow CBM wells, deep CBM wells predominantly produce free gas in the early stage, characterized by rapid and high gas production; and (4) the production capacity of deep CBM wells is mainly influenced by reservoir stress characteristics, the effectiveness of fracturing, and the continuity of production. This study provides a valuable reference for the formulation of deep CBM drainage and production systems and development strategies.

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Section: Geological Setting and Development Status Of The Dj Blockmentioning

confidence: 99%

Dynamic Production Characteristics of Deep Coalbed Methane: A Case Study of Daning-Jixian Block

Zhang,

Lai,

Meng

et al. 2024

Energy Fuels

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Investigation into Enhancing Methane Recovery and Sequestration Mechanism in Deep Coal Seams by CO2 Injection

Sun,

Wang,

Gong

et al. 2024

Energies

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Injecting CO2 into coal seams to enhance coal bed methane (ECBM) recovery has been identified as a viable method for increasing methane extraction. This process also has significant potential for sequestering large volumes of CO2, thereby reducing the concentration of greenhouse gases in the atmosphere. However, for deep coal seams where formation pressure is relatively high, there is limited research on CO2 injection into systems with higher methane adsorption equilibrium pressure. Existing studies, mostly confined to the low-pressure stage, fail to effectively reveal the impact of factors such as temperature, high-pressure CO2 injection, and coal types on enhancing the recovery and sequestration of CO2-displaced methane. Thus, this study aims to investigate the influence of temperature, pressure, and coal types on ECBM recovery and CO2 sequestration in deep coal seams. A series of CO2 core flooding tests were conducted on various coal cores, with CO2 injection pressures ranging from 8 to 18 MPa. The CO2 and methane adsorption rates, as well as methane displacement efficiency, were calculated and recorded to facilitate result interpretation. Based on the results of these physical experiments, numerical simulation was conducted to study multi-component competitive adsorption, desorption, and seepage flow under high temperature and high pressure in a deep coal seam’s horizontal well. Finally, the optimization of the total injection amount (0.7 PV) and injection pressure (approximately 15.0 MPa) was carried out for the plan of CO2 displacement of methane in a single well in the later stage.

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Geological adaptability of deep CBM fractured horizontal well in SLN block

Cited by 2 publications

References 21 publications

Dynamic Production Characteristics of Deep Coalbed Methane: A Case Study of Daning-Jixian Block

Dynamic Production Characteristics of Deep Coalbed Methane: A Case Study of Daning-Jixian Block

Investigation into Enhancing Methane Recovery and Sequestration Mechanism in Deep Coal Seams by CO2 Injection

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