Boring or penetrating the earth – Tool shaft advanced relative to guide insertable in... – Tool telescopes over guide having surface set at angle in hole
Patent
1989-11-30
1991-05-07
Dang, Hoang C.
Boring or penetrating the earth
Tool shaft advanced relative to guide insertable in...
Tool telescopes over guide having surface set at angle in hole
175 81, 175 83, E21B 708
Patent
active
050128779
ABSTRACT:
Apparatus and method for deflecting the drilling direction of a rotary drill string and drill bit through a borehole wall include an anchor, a housing, and a chute. The anchor anchors the apparatus in the borehole. The housing is connectable to the anchor and has an uphole end, a downhole end, a sidewall extending between the uphole end and the downhole end, and a passageway extending through the housing. The passageway has an entrance through the uphole end of the housing and an exit through the sidewall of the housing. The chute is slidably disposed in the housing passageway and has an uphole end, a downhole end, a sidewall extending between the uphole end and the downhole end, and a passageway extending through the chute from the uphole end through the downhole end. The chute passageway passes the drill bit and drill string through the chute. The chute is movable between a retracted position in which the chute is retracted into the housing passageway and an extended position in which the chute is extended through the housing passageway exit to the borehole wall. The apparatus is inserted into a borehole and anchored, the chute is released to extend into contact with the borehole wall, and the drill bit and drill string are deflectingly passed through the chute.
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"Pack-Stock" sales brochure by A-Z International Tool Company.
Bailey, Thomas F. "The Pack-Stock: An Economic Method of Sidetracking Through a Cased Hole", Drilex Technical Bulletin 8807.
Burton Michael B.
Winters Warren J.
Amoco Corporation
Brown Scott H.
Dang Hoang C.
Hook Fred E.
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