Rotary Drilling Holes in Coalbeds for Degasification
Public Domain
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01/01/1975
Details
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Description:Coal is a soft and brittle material. Drilling rates in the Pittsburgh coalbed using a drag bit exceed 3 ft/min at 2,500-pound thrust. However, maintaining the bit on a horizontal trajectory or parallel to bedding planes to attain lengths of 1,000 feet i...
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NIOSHTIC Number:nn:na
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Main Document Checksum:urn:sha-512:ac6b95fd20cc528c6207e609c5d7d90f7d2a77c72cd434cbdc4dbd687d36fa3f8736d3041fac5e8970a3926b7b0f02592ffd1a39d8757392d7858501945c5476
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