Since 1984, the Gas Research Institute has been conducting field evaluations of coalbed methane technology at the Rock Creek Project site near Birmingham, Alabama. This paper presents and discusses preliminary conclusions based on initial reservoir engineering analysis of data gathered from field experiments performed at Rock Creek.

Major conclusions from the analysis performed to date are 1) post shut-in methane production is not significantly reduced by water influx during normal shut-in periods, 2) long-term methane recovery from a well is not a function of initial water pumping rate, provided the initial rate is above the minimum required to initiate desorption, and 3) well-to-well interference is the primary mechanism for efficient recovery of coalbed methane.

Ongoing reservoir engineering analysis will provide further insights toward characterizing methane production from multi-zone completion wells and establishing a rationale for dewatering coalbed methane wells.

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