E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/56 (2006.01) E21B 7/20 (2006.01) E21B 10/32 (2006.01) E21B 10/40 (2006.01) E21B 10/66 (2006.01)
Patent
CA 2074076
2074076 9110805 PCTABS00006 A drilling tool for percussive and rotary drilling in advance of a trailing casing tube (20) has a reamer (15) pivotally journalled on an eccentric shaft (12) rearwardly of a centric pilot bit (11). The reamer (15) has an eccentric portion (32) carrying axially directed hard metal button inserts (36-40) grouped within an acute angle (V) of a circle sector centered on the drilling axis (C). The inserts comprise primary inserts (36-38) with a radial reach defining the full diameter of the drilled hole and inner secondary inserts (39, 40) closer to the shaft (12). The reamer (15) is pivotable on the shaft (12) between a projected and a retracted position. When projected, the group of button inserts (36-40) ream up the hole from the diameter drilled by the pilot bit (11) to the full diameter of the hole enabling the casing tube (20) to advance. In the retracted position the drilling tool (10) can pass through the casing tube (20). A duality of inserts (36, 39) leading in the rotational direction act jointly to break the rock in said direction substantially tangentially relative to the shaft (12). The rock cuttings from the button inserts (36-40) are subjected to enhanced flushing action. Optionally such flushing action is further supported by a groove (52) on the rotationally leading flank of the reamer (15). A cutting edge (54) on the groove (52) is reinforced by stellite and improves drilling of claybound ground.
Lof Stig Uno
Stjernstrom Karl-Axel
Fetherstonhaugh & Co.
Uniroc Aktiebolag
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