E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
E21C 41/16 (2006.01) E21B 43/29 (2006.01) E21C 41/24 (2006.01) E21C 45/04 (2006.01)
Patent
CA 2064395
ABSTRACT An extendable, retractable, erectable arm assembly for housing and supporting a water conduit which extends outward from a tool located in a borehole, to a nozzle to produce a high pressure water cutting jet, said arm assembly comprising a plurality of interlocking arm segments for housing, supporting and moving the conduit through an angle of about 90° from a stowed position to an operating position said arm segments comprising integral, separable hinges having interlocking means such that pivotal movement is possible along any side thereof, and having mating apertures therethrough to accommodate the conduit; erecting means at an upper portion of the arm segments to provide compression on the segments giving the arm rigidity during movement in any direction; alignment means at a lower portion of the arm segments to keep the arm segments aligned when the arm is deflected; means for applying tension to the erecting means whereby the arm may be held erect in a cantilever position allowing the nozzle to remain in close proximity to a surface at which the high pressure water cutting jet is directed; launching means to turn and lift the arm so that the arm may be extended and retracted at any angle and position; and means for moving the arm within the tool from one position to another along the longitudinal axis of the borehole whereby the arm is extended and retracted and hence travels from operating to stowed positions. The arm assembly has particular application with a mining tool located in a substantially vertical borehole with the water cutting jet directed at a mining surface and being capable of operation in a water or air filled cavity. The assembly may be used to extract minerals or mineral bearing ore, such as bitumen from subterranean deposits such as tar sands. Also disclosed is an apparatus and a method of borehole mining.
Knoke Gerald S.
Mcdonald Michael
Paul Raj
Theimer Kenneth J.
Borden Ladner Gervais Llp
Esso Resources Canada Ltd
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