Gas production from coal seams has been highly successful due to the use of open-hole completion techniques in the high permeability fairway of the San Juan Basin (Colorado and New Mexico) Fruitland Formation. Based upon extensive formation evaluation data collected during Gas Research Institute funded research efforts, dynamic open-hole (cavity) completion production out-performed hydraulic fracture completion production regardless of the magnitude of natural fracture permeability due to lack of formation damage. This paper will illustrate four examples of the use of open-hole completion procedures that resulted in undamaged completions in reservoirs with absolute permeability ranging from 0.9 to 95 md. The formation evaluation data upon which the conclusions were based included open-hole logs, production logs, sonar logs, single well tests, and interference tests. The latest information has not been previously reported upon in the literature.

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