Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall
Patent
1991-02-28
1993-04-27
Britts, Ramon S.
Boring or penetrating the earth
With below-ground tool drive prime mover
With means to anchor prime movers support to bore wall
175230, 166380, E21B 400
Patent
active
052053652
ABSTRACT:
A pressure actuated, telescoping subassembly is supported by a pipe string to axially move an attached member within a wellbore. Increasing fluid pressure to the subassembly actuates a telescoping action, axially moving the attached member but not the supporting pipe string. Motion can be used during rotary drilling or running of tubulars into a drilled borehole portion. Pressure actuation provides a means to remotely apply axial force near the member, such as a tool or drill string portion. Moving only the member instead of the entire drill string and member lowers the total force required to move members and provides a new means to chase drill bits and apply constant drilling forces. This minimizes the risk of pipe string overloading and buckling, exceeding rig weight limitations, and tool bit damage.
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Britts Ramon S.
Jacobson William O.
Schoeppel Roger J.
Union Oil Company of California
Wirzbicki Gregory F.
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