Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (4): 9-11.doi: 10.3969/j.issn.1673-8926.2011.04.002

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Research on the flow mechanism of coalbed methane

LI Chuanliang1，PENG Chaoyang2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China； 2. Coalbed Methane Co. Ltd.， PetroChina， Beijing 100082， China
  • Online:2011-08-20 Published:2011-08-20

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Abstract:

Coalbed methane is an unconventional natural gas resource of self-generating and self-preserving. In order to develop the gas properly, it is necessary to study deeply the flowmechanismof coalbed methane. Coalbed methane is stored in the cheats of coalbed and pores of coal matrix, which is in the form of adsorption and coexists with formation water in coals. Coalbed methane must be desorbed from the pore wall before developed. Production of water from coalbed results in the drop of pressure, which leads to the desorption of coalbed methane to free gas. The coalbed methane desorbed flows to well bottomalong cheats in coals and then is developed to ground surface. The development of coalbed methane can be divided into three stages: degassing, desorption and flowing. Diffusion is not a part of flow mechanismof coalbed methane.

Key words: Feixianguan Formation, tectonic origin, fracture prediction, Huanglongchang structure, northeastern Sichuan Basin

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