Boring or penetrating the earth – With below-ground tool drive prime mover – Electric
Patent
1989-11-29
1991-10-29
Dang, Hoang C.
Boring or penetrating the earth
With below-ground tool drive prime mover
Electric
174 47, 175215, 175320, 175324, 439194, E21B 404, E21B 1700
Patent
active
050607375
ABSTRACT:
A drilling system comprises a drill string (1) incorporating inbuilt tubular conductors (25), a mud supply passage, and passages for protective or other fluids. The drill string can be advanced by selectively actuable pistons (51,60) exposed to drilling mud flow, by electrically driven traction units (71,74) engaging the drill hole wall or by a linear electric motor element (82) co-operating with a drill hole casing (24), which can be moved thereby relative to the drill string. The drill bit (106) of the drill unit is driven rotatably by an electric motor (111,112) or reciprocably by a linear electric motor (125). The drill unit can be of two relatively slidable parts, with fluid pressure, which may be generated within the unit (189) axially loading the drill bit. Drilling forms can be resisted by clamps (129) clamping the unit and/or the drill string to the drill hole wall. The drilling direction can be adjusted by use of these clamps.
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Dang Hoang C.
Framo Developments (UK) Limited
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