Strictive material deflectable collar for use in borehole angle

Details Strictive material deflectable collar for use in borehole angle Strictive material deflectable collar for use in borehole angle

1979-12-10

1981-09-29

Leppink, James A.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 73, 175320, 324226, E21B 704

Patent

active

042917735

ABSTRACT:
A deflectable drill collar having strictive material deflectable elements is connected in a drill string of drilling apparatus. Energization of the strictive material deflectable elements, such as magnetostrictive elements, deflects the drill collar, thereby altering the axes of the drilling apparatus connected at opposite ends of the deflectable collar from a colinear relationship to a non-colinear relationship. Energizing means associated with the deflectable drill collar energizes the strictive material elements during preselected intervals of rotation of the drilling apparatus to place the cutting elements of a drill bit into more effective cutting relation with gage corner material of the borehole, or to articulate the drill string and force the drill bit in a desired direction. Apparatus for energizing the strictive material deflectable elements includes control and energy deriving apparatus attached to the drill string at a position at which gravity induced sag causes the drill string to contact the low side portion of the borehole during partial intervals of drill string rotation.

REFERENCES:
patent: 3096822 (1963-07-01), Hall
patent: 3731752 (1973-05-01), Schad
patent: 3808820 (1974-05-01), Bodine
patent: 3811519 (1974-05-01), Driver
patent: 3853186 (1974-12-01), Dahl et al.
patent: 3903974 (1975-09-01), Cullen
patent: 4042046 (1977-08-01), Capoccia

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