Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1980-02-08
1981-11-10
Leppink, James A.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
166 50, 166308, 175 61, 175 73, 175107, 175256, E21B 402, E21B 704, E21B 708, E21B 47024, E21B 4326
Patent
active
042992958
ABSTRACT:
A process for drilling spaced horizontal boreholes in a coal or other mineral deposit in excess of 1500 feet in length in a pattern determined to maximize gas removal. Directional guidance is provided by a continuous downhole survey tool connected to data display devices by an internal drill rod cable system. Directional drilling control is provided by a positive displacement motor positioned at the end of the drill string and operated by a flow of drilling fluid through the drill string from the drilling rig. The mineral strata surrounding the borehole is periodically hydrofractured to permit effective removal of the gas. The hydrofractionation is effected without removal of the drill string or survey instruments from the borehole. Upon completion of the borehole, the drill string is removed and gas which enters the borehole from the surrounding deposit is withdrawn.
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"Bits Make Methane Drainage Economical", Coal Age, Nov. 1978.
Addison William G.
Kerr-McGee Coal Corporation
Leppink James A.
Suchfield George A.
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