Mining Publication: Evaluation of Alternative Placement of Longwall Gob Gas Ventholes for Optimum Performance

Original creation date: January 1994

Authors: WP Diamond, PW Jeran, MA Trevits

Report of Investigations - January 1994

NIOSHTIC2 Number: 10005159

Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9500, 1994 Jan; :1-14

In this U.S. Bureau of Mines study, production trends have been analyzed for 82 gob gas ventholes on 7 longwall panels in the Lower Kittanning Coalbed, Pennsylvania. The variability of gas production from individual holes can be attributed to several factors, including completion practices and problems, the extent of fracture development in the strata above the extracted panel, water production, and location on the panel. Of particular significance is hole location. Holes on the ends of the panels, where overburden strata are in tension because of the support of the surrounding pillars, were generally the highest and longest producers.

Image of publication Evaluation of Alternative Placement of Longwall Gob Gas Ventholes for Optimum Performance
Report of Investigations - January 1994

NIOSHTIC2 Number: 10005159

Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9500, 1994 Jan; :1-14


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