Abstract
Development of Coalbed Methane (CBM) has boomed in USA since late eighties. Many petroleum technologies has been applied for recovering the CBM economically. In spite of many efforts, not all the projects have succeeded, because of the differences of reservior properties between coal seam and conventional natural gas formation. This paper summarizes the present technologies for developing the CBM and CBM related properties of coal seams. The followings are reported; world resource estimation of CBM, gas storage characteristics of coal seam, gas and water flow pattern in the coal seam, well drilling method, well completion method, stimuation methods, simulation technology and the related environmental problems.
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