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XU Ang，SANG Shuxun，ZHOU Xiaozhi，et al. Optimal design of coalbed methane wells in mining area with thin to medium thick coal seam group[J]. Coal Science and Technology，2025，53（3）：383−396. DOI: 10.12438/cst.2024-1461
Citation: XU Ang，SANG Shuxun，ZHOU Xiaozhi，et al. Optimal design of coalbed methane wells in mining area with thin to medium thick coal seam group[J]. Coal Science and Technology，2025，53（3）：383−396. DOI: 10.12438/cst.2024-1461
shu

Optimal design of coalbed methane wells in mining area with thin to medium thick coal seam group

  • 1.

    Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, Ministry of Education, Xuzhou, 221008, China

  • 2.

    School of Mineral Resource and Geoscience, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

  • 3.

    Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China

  • 4.

    Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, , Xuzhou, 221008, China

  • 5.

    Guizhou Research Center of Shale Gas and CBM Engineering Technology, Guiyang 550081, China

  • 6.

    Guizhou Panjiang Coalbed MethaneDevelopment and Utilization Co., Ltd., Guiyang 550081, China

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  • Available Online: March 20, 2025
    Graphical Abstract
    • Abstract

  • In mining areas, utilizing coalbed methane (CBM) wells to extract stress relief coalbed methane from adjacent coal seams is an efficient strategy. To enhance CBM extraction, it is vital to reveal the dynamics of stress and fracture fields evolution and optimization well locations and structure. Taking No. 221015 coalface in Shanjiaoshu coal mine as the study area. By integrating geo-engineering models and engineering data, the stress distribution within and between the overburden was elucidated, the distribution of fracture and the permeability increased zone in the overburden were elucidated, and the well location, structures and enhancement measures were designed. The research demonstrates that: The frequent alternation of lithological properties in the coal measure strata in the study area enhanced the mining influence on overburden. As the key strata progressively fail, the zone located 5～20 meters above the coalface were the fracture zones, in which a large amount of free methane can be migrated and produced across layers, serving as the primary gas source zone of CBM well. The 20～45 meters interval above the coalface belonged to the microfracture zone in the bending subsidence zone, possessing a gas production potential of nearly 2000 m3/d from adjacent coal seams within a single layer. In this area, stress relief CBM primarily migrates intra-strata and accumulates methane originating from the fracture zone. Optimal well site locations was enclosed by tangential line of the compaction zone along the direction of the coalface and the center line between tangential line of the compaction zone and the return airway, and boundary lines around fractured zones. Meanwhile, the two - or three-stages structure wells with high strength cement cementing and using reaming or screen suspended completion have good stability, which can guarantee long-term extraction work of CBM well. The optimized extraction well scheme provides technical support for achieving a gas production breakthrough of 35000 m3/d from in mining areas of Qianxi region, significantly mitigating the risk of gas outbursts at the coalface. Based on the geological characteristics of multi-layered superimposed CBM systems, the "multi-usage" mode of the vertical well of “multi-layer fracturing and drainage + mining induced stress relief CBM extraction” can serve as a key development direction of “increasing production and efficiency”.

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