E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
189/15, 255/24
E21B 4/04 (2006.01) E21B 4/00 (2006.01) E21B 4/18 (2006.01) E21B 7/06 (2006.01) E21B 17/00 (2006.01) E21B 17/18 (2006.01) E21B 47/12 (2006.01)
Patent
CA 1327789
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 means of these clamps.
541052
Cassan Maclean
Framo Engineering A.s.
LandOfFree
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