Method and apparatus for optional straight hole drilling or dire

Details Method and apparatus for optional straight hole drilling or dire Method and apparatus for optional straight hole drilling or dire

1991-03-05

1992-03-31

Novosad, Stephen J.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Normally curved guide or shaft

175 61, 175 76, 1753252, 175107, E21B 708, E21B 402

Patent

active

050999311

ABSTRACT:
The present invention relates to a method and apparatus for navigational driling in earth formations, the apparatus including a downhole drilling assembly having a drill bit driven by a downhole motor and a deflection element or elements in the assembly for imparting an angle of deflection to the drill bit relative to the drill string above the drilling assembly. At least two stabilization points for the drilling assembly in the borehole are used, with the drill bit, to define an arcuate path for the drilling assembly when the downhole motor is operating but the drill string is not rotating. When the drill string is rotated, the drilling assembly drills a substantially straight or linear borehole.

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