Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1989-05-23
1991-11-26
Melius, Terry L.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, 175 75, 175 76, E21B 708
Patent
active
RE0337510
ABSTRACT:
A system and method for controlled directional drilling utilizes a system approach to design the hardware for drilling according to the well plan. The bend angle of a bent housing, connected between the bit and downhole motor, the diameter of a plurality of stabilizers and placement of the stabilizers with respect to the drill bit are selected and predetermined on the basis of the desired well plan. With the use of an MWD, the direction of the progressing borehole is tracked from the surface. Direction changes as required are controlled from the surface simply by controlling rotation of the drillstring. For curved path drilling, only the downhole motor is rotated, causing the borehole to travel along the curve determined by the bend angle in the bent housing and the diameter and location of the concentric stabilizers. When straight hole drilling is required, both the downhole motor and the entire drill string are rotated, effectively nullifying the effect of the bend angle in the bent housing.
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Desbrandes, R. and Morin, Pierr
DeLucia Frank
Geczy Bela
Melius Terry L.
Rose David A.
Shull William E.
Smith International Inc.
Tayon Jeffrey W.
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