E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/31
E21B 4/04 (2006.01)
Patent
CA 1181739
ABSTRACT OF THE DISCLOSURE The present invention relates to the provision of a system for providing forward thrust for a fluid immersed boring tool. More particularly, the invention provides the necessary thrust, a dynamic force, for the operation of a rotary boring tool in situations, such as the drilling of generally horizontal bore holes, where the force of gravity does not act effectively to provide forward thrust. The invention is especially efficaceous with flexible drill pipe or conduit such as may be used in drilling bore holes having a small radius of curvature. Thus this specification discloses a rotary drilling tool which includes a fluid passage extending through a boring means mounted at the end of a hollow shaft for discharge of fluid and a marine screw propeller fixed to the shaft in a manner such that rotation of the propeller generates forward thrust along the axis of the shaft. The arrangement is such that the energy carried by the fluid in the passage is converted to a force causing rotation of the shaft carrying the propeller, whereby the propeller causes forward motion of the conduit and boring means.
423180
Dismukes Newton B.
Gowling Lafleur Henderson Llp
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