专利名称：Method for enhancing methane production
from coal seams
发明人：Robert Mark Bustin,Alexander Thomas
Rozak
申请号：US11006601申请日：20041208
公开号：US20050082058A1公开日：20050421
摘要：Discloses a three step process to stimulate well production of methane fromcoal seams, wherein step one provides for injection of a treating gas into a well boreintersecting a coal seam, step two includes a shut-in period and step three comprises theplacement of a propped fracture treatment. In step one, the injection of the treating gasphysically opens pre-existing paths of weakness in the coal. As the treating gas travelsalong these planes of weakness, it preferentially adsorbs onto the coal and displaces themethane. This displacement process induces shrinkage of the coal matrix, which furtherincreases the size of the intervening existing fractures. The second step, or shut-in period,allows time for this gas exchange process to substantially complete, thereby maximizingthe effect of matrix shrinkage and enhancement of the intervening fractures. The thirdstep provides for placement of a propped fracture treatment into this enhanced fracturesystem. Propping of the enhanced fractures ensures that they remain open, even asremoval of water and methane work to close the fractures by increasing effective stresswithin the coals. The result is a stimulated coal seam that maintains enhancedpermeability during production operations.
申请人：Robert Mark Bustin,Alexander Thomas Rozak
地址：Delta CA,Calgary CA
国籍：CA,CA
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