Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1990-09-24
1992-03-10
Melius, Terry Lee
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 76, 1753253, E21B 0708
Patent
active
050943049
ABSTRACT:
A selectively adjustable double bend positive positioning directional drilling system for kickoff from a main well bore to change the directiion of drilling. The tool is selectively adjustable to facilitate running into the vertical well bore and subsequently to provide an aggressive build rate upon kickoff. The tool string incorporates a pair of kickoff pads--a lower fixed pad and an upper rotatively adjustable pad. As the tool is run into the well bore the adjustable pad is oriented away from the bend in the motor housing. Once in the hole, the string would be rotated relative to the adjustable pad by the reactive torque of the downhole motor and locked in the desired orientation. The adjustable pad incorporates an internal slot system to guide rotation and lock the pad in position. Alternatively, a single arm underreamer-type assembly could be used as the upper kickoff pad.
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Drilex Systems, Inc.
Melius Terry Lee
Sutherland Malcolm L.
Zarins Edgar A.
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