Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Patent
1984-05-04
1986-09-23
Leppink, James A.
Boring or penetrating the earth
With tool shaft detail
Means other than tool structure to induce fluent flow
175293, 175417, E21B 406
Patent
active
046130039
ABSTRACT:
A borehole excavation apparatus and method which employs a down-hole positive displacement pump to circulate the drilling fluid and lift the excavated rock to the surface through nonmetallic composite pipe. The excavation of rock occurs by use of apparatus which produces a combination of percussion impact, cavitation, and hydrostatic depressuring which utilizes the pore pressure and elastic energy stored within the rock to fracture the rock into small pieces. The down-hole positive displacement pump and the excavation tool are actuated by the axial oscillation of a weighted momentum unit which in turn is actuated by the axial oscillation of the nonmetallic composite pipe, which in turn is actuated by the oscillating motion of a rocker beam at the surface where the drilling fluid and excavated rock particles are discharged.
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Leppink James A.
Smith Matthew
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