Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1997-11-07
2000-04-18
Lillis, Eileen Dunn
Boring or penetrating the earth
Processes
Boring with specific fluid
176393, E21B 1018
Patent
active
060503521
ABSTRACT:
A method of forming boreholes using a cutting head having a low angle cutting face includes positioning orifices within the cutting head to direct pressurized streams of drilling fluid to impinge directly on the cutting face. The pressurized fluid streams clear excavated material away from the cutting face to increase the efficiency of the cutting head. In one embodiment, the orifices are positioned within the cutting face, while a second embodiment positions the orifices behind the cutting face. An alternative method provides for the stealthy formation of boreholes without disturbing the surrounding formation. The method includes positioning an orifice within the cutting head behind the cutting face to direct drilling fluid toward excavated material which has accumulated within the cutting head to a point behind the cutting face. The drilling fluid mixes with the excavated material to form a slurry while an interior pipe vacuums the slurry from the cutting head before the drilling fluid migrates to the surrounding formation.
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Lillis Eileen Dunn
Phillips John B.
Singh Sunil
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