Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 121-128.doi: 10.12108/yxyqc.20190514

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Main controlling factors of productivity and reasonable development methods of low-rank coalbed methane in block M of Australia

SU Penghui1, XIA Zhaohui1, LIU Lingli1, DUAN Lijiang1, WANG Jianjun1, XIAO Wenjie2   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. College of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an 710300, China
  • Received:2019-03-10 Revised:2019-05-22 Online:2019-09-21 Published:2019-09-16

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Abstract: Low-rank CBM reservoir has rich resources and huge development value. Combined with the production characteristics of low-rank coalbed methane wells and geological model of gas field,a numerical model of lowrank coalbed methane wells was established,the sensitivity analysis of the factors affecting the productivity was carried out,and the main controlling factors affecting the productivity of coalbed methane wells were defined. Based on the division of reservoir physical properties,the optimization study of reasonable development methods of low-rank coalbed methane was conducted. The results show that the commingled producing well passing through JJ and TT two sets of coal seam groups longitudinally had high degree of vertical reservoir control and large drainage,which is helpful for pressure reduction and desorption. Therefore,the commingled wells greatly increased the average single well production. The main controlling factors affecting the productivity of low-rank coalbed methane wells are cumulative net thickness,permeability, gas content, well spacing and gas saturation. Through the optimization analysis of well spacing for six types of reservoir,for the reservoirs with buried depth less than 250 m,the optimal well spacing is 1 500 m;for the reservoirs with buried depth of 250-350 m,the optimal well spacing is 1 200 m;for the reservoirs with buried depth of 350-450 m,the optimal well spacing is 1 000 m;for the reservoirs with buried depth of 450-600 m,the optimal well spacing is 8 00 m; for the reservoirs with buried depth greater than 600 m,the optimal well spacing is 700 m. This study could provide theoretical basis and technical support for the selection and development optimization of favorable areas in gas fields.

Key words: low-rank coal, coalbed methane, main controlling factors of productivity, well spacing, Australia

CLC Number: 

  • TE122
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