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Rotary drilling holes in coalbeds for degasification

Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.

Published Year

• 1970-1979 (2)

Subject

• Boring (2) *
• Coal mines and mining (1)
• Degassing of coal (1)
• Mine gases (1)
• Mine safety (1)
• Mine ventilation (1)

Author

• Fields, H. H. (2) *
• Aul, George N. (1)
• Cervik, Joseph. (1)
• Diamond, W. P. (1)
• Oyler, David C., (1)

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