Reaming apparatus and method with enhanced stability and transit

Details Reaming apparatus and method with enhanced stability and transit Reaming apparatus and method with enhanced stability and transit

1996-10-09

1998-06-16

Tsay, Frank

Boring or penetrating the earth

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

Normally curved guide or shaft

175385, 175398, E21B 708

Patent

active

057656533

ABSTRACT:
A method and apparatus for reaming or enlarging a borehole with enhanced stability. A pilot stabilization pad (PSP) having an axially and circumferentially tapered entry surface and a circumferential transition surface above is employed to enhance the transition from the smaller diameter borehole to be enlarged while accommodated the side force vector generated by the cutting assembly used to effect the enlargement. In addition, one or more eccentric stabilizers are employed above the reaming apparatus to laterally or radially stabilize the bottomhole assembly, which may comprise either a straight-hole or steerable, motor-driven assembly.

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