Process for use in degasification of subterranean mineral deposi

Details Process for use in degasification of subterranean mineral deposi Process for use in degasification of subterranean mineral deposi

1980-02-08

1981-06-16

Leppink, James A.

Wells

Valves, closures or changeable restrictors

166 50, 175 45, 175 61, 175 62, 175105, E21B 708, E21B 47022, E21B 4325

Patent

active

042731933

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. Apparatus is provided to permit the passage of said cable system through the interior of a rotatable drill chuck assembly comprising a part of a drilling apparatus for drilling said boreholes. The apparatus supports the cable such that the cable is maintained in a substantially nonrotating position within the drill chuck assembly. 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. Upon completion of the borehole, the drill string is removed and gas which enters the borehole from the surrounding deposit is withdrawn.

REFERENCES:
patent: 3823787 (1974-07-01), Haworth et al.
patent: 3934649 (1976-01-01), Pasini et al.
patent: 4043395 (1977-08-01), Every et al.
patent: 4051456 (1977-09-01), Hellbecker et al.
patent: 4143721 (1979-03-01), Zuvela et al.
patent: 4153120 (1979-05-01), Zuvela et al.
"Bits Make Methane Drainage Economical," Coal Age, Nov. 1978.

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