Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1985-10-08
1987-07-07
Leppink, James A.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175100, 175106, 175107, 175227, 415111, 415502, E21B 402, E21B 704
Patent
active
046780459
ABSTRACT:
A drill string is made flexible near the lower marginal end thereof, and a pneumatic turbine motor is located at the lower terminal end thereof. The pneumatic turbine is connected to a planetary gear reduction system for rotating a drill bit. The diameter and the length of the pneumatic turbine motor, gear reduction system, and bit is of a size which enables the entire assembly to negotiate a sharp bend in the borehole, so that the borehole can be formed to extend downwardly along a relatively straight vertical line towards a payzone, where the borehole then sharply bends laterally towards the payzone, and then continues in another relatively straight line horizontally through the payzone. The pneumatic turbine motor includes reaction ports arranged to force the drill bit against the formation being penetrated, and to counteract the bit torque. Part of the input gases pass through the pneumatic turbine and is exhausted through the bit while the remaining part of the input gases is exhausted through the reaction ports into the annular space, and serve as drilling fluid.
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Dang Hoang C.
Leppink James A.
Snead James E.
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