Volume 46 Issue 5
Oct.  2018
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WU Guodai, GUO Dongxin, CHENG Lijun, CHENG Jun, ZHU Changsheng, XIE Qingming, LIU Daixi, WANG Kaiwen. Characteristics and revelation of pressure drop of reservoir during combined CBM production of multi-coal seams in Songzao mining area[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 123-128. DOI: 10.3969/j.issn.1001-1986.2018.05.019
Citation: WU Guodai, GUO Dongxin, CHENG Lijun, CHENG Jun, ZHU Changsheng, XIE Qingming, LIU Daixi, WANG Kaiwen. Characteristics and revelation of pressure drop of reservoir during combined CBM production of multi-coal seams in Songzao mining area[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 123-128. DOI: 10.3969/j.issn.1001-1986.2018.05.019
shu

Characteristics and revelation of pressure drop of reservoir during combined CBM production of multi-coal seams in Songzao mining area

  • 1. National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China;

  • 2. Key Laboratory of Shale Gas Exploration, Ministry of Land and Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China;

  • 3. Chongqing Engineering Research Center of Shale Gas Resource & Exploration, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China

Funds: 

Science and Technology Plan of Chongqing Land Resource and House Administration(KJ-2015017,KJ-2018030)

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  • Received Date: June 14, 2018
  • Published Date: October 24, 2018
    Graphical Abstract
    • Abstract
  • Coalbed methane exploration and development of Late Permian Longtan Formation in Southwest China has achieved good results, and weak aquifer in this region restricts the drainage of coalbed methane. In order to reveal the pressure drop characteristics of different reservoirs in the coal seam group, based on the plane radial seepage theory, using the geological engineering data of well Q1 in Songzao mining area, based on the comprehensive analysis of the bottom hole flow pressure, the set pressure, the daily water production and the daily gas output data, the mathematical model of the bottom hole flow pressure of different reservoirs was established vertically, and the pressure drop of different reservoirs features was analyzed. The results show that the initial gas production time of coal seams M6, M7 and M8 was 45 d, 162 d and 217 d. The reservoir pressure and permeability controlled the reservoir feeding capacity, leading to the decrease of pressure drop effect as the layer lowered, and the critical desorption pressure of the reservoir(4.07 MPa) and the low water production(0.23 m3) affected the combined CBM extraction effect of multiple coal seams. It is an important work direction to strengthen the comprehensive study of the selected layers, the analysis of the characteristics of water production and the study of the timing of water injection, to carry out research and development of progressive production-related process equipment and engineering exploration.
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    • References (27)
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