Bottom hole assembly

Details Bottom hole assembly Bottom hole assembly

2008-01-08

2008-01-08

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

C175S385000, C175S406000

Reexamination Certificate

active

11085335

ABSTRACT:
A bottom hole assembly has a drill bit and an under-reamer on the up-hole side of the drill bit. In one aspect, the assembly further has a compliant element linking the drill bit to the under-reamer, the compliant element allowing displacement of the drill bit relative to the under-reamer in the axial direction of the assembly. In another aspect, the assembly further has a sensor element which is arranged to measure the weight-on-bit and/or the applied torque of the drill bit, and a transmitter for transmitting the weight-on-bit and/or applied torque measurements to the surface.

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