Mining Publication: Commercial-Quality Gas From a Multipurpose Borehole Located in the Pittsburgh Coalbed
This report describes a multipurpose borehole used for both degasification and the production of commercial-quality gas. The multipurpose borehole was drilled into a barrier pillar, and seven horizontal degasification holes and one pressure point hole were drilled radially out from its perimeter. This study indicates that horizontal boreholes drilled into a coalbed from the bottom of any shaft will effectively remove gas from the Pittsburgh coalbed.
Report of InvestigationsJanuary - 1975
NIOSHTIC2 Number: 10000665
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8025, 1975 Jan; :1-14