Mining Publication: Geology and Gas Content of Coalbeds in Vicinity of Bureau of Mines, Bruceton, Pa.
Original creation date: January 1977
Authors: CH Elder, MC Irani
Two degasification test boreholes were drilled to depths of 1,238 and 1,212 feet on Bureau of Mines property at Bruceton, Pennsylvania, as part of the Bureau of Mines long-range coal degasification program. The holes provided detailed geologic information and geologic sections, which were correlated with regional stratigraphic cross sections prepared by the Pennsylvania geological survey. Gas content determinations and coal analyses were made on the Upper Freeport, Middle Kittanning, Clarion, Brookville, and Mercer coalbeds; gas content of the coalbeds ranged from 53 to 165 cubic feet per ton. Formation pressure and gas flow tests were conducted on selected coalbed intervals in borehole 1; formation pressures ranged from 292 to 473 psig. The middle Kittanning coalbed was hydraulically stimulated using very heavy gelled water, but gas production remained low because gel residue and formation water inhibited the flow of gas. Gas contents in the Clarion, Upper Brookville, and Mercer coalbeds were anomalously low owing to the proximity of porous sandstones which act as reservoirs for gas migrating from coalbeds.
- The Composition of Coalbed Gas
- Evaluation of Alternative Placement of Longwall Gob Gas Ventholes for Optimum Performance
- Gas Sorption and Transport in Coals: A Poroelastic Medium Approach
- Geologic Factors Influencing the Gas Content of Coalbeds in Southwestern Pennsylvania
- Geological Factors Affecting Methane in the Beckley Coalbed
- Geology and Methane Content of the Upper Freeport Coalbed in Fayette County, Pa.
- History of the Mining Program
- Improved Methods for Monitoring Production From Vertical Degasification Wells
- The Modified Direct Method: A Solution for Obtaining Accurate Coal Desorption Measurements
- Optically Powered Remote Gas Monitor