Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent
1988-10-24
1989-11-28
Novosad, Stephen J.
Boring or penetrating the earth
With below-ground tool drive prime mover
Below-ground storage of motivating energy
175 96, 175106, 175414, 175417, 175296, E21B 406, E21B 414, E21B 416, E21B 1036
Patent
active
048831336
ABSTRACT:
A percussion drilling apparatus for drilling bore holes into subterranean formation in which a plurality of drill rods are arranged in concentric rows in a drill bit housing, each rod having an impact tooth at its lower ends and the rods arranged either to converge inwardly adjacent to the center of the housing or to diverge outwardly at progressively increased angles in each row toward the outermost row. The impact teeth are fired sequentially by concentric combustion chambers arranged above the drill rods and where the pattern and rate of firing can be controlled by cam operated intake and exhaust valves associated with the combustion chambers. The drill bit housing is arranged at the lower end of the drill string with an umbilical cord which carries all necessary cables and lines between the surface controls and the drill bit housing for the purpose of controlling combustion in each chamber and of carrying away the cuttings as the drilling operation proceeds.
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patent: 3870113 (1975-03-01), Slawson
Fletcher Gerald L.
Fletcher Gregory T.
Novosad Stephen J.
Reilly John E.
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