Bi-center and bit method for enhancing stability

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore

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175399, E21B 1026, E21B 1056

Patent

active

056786441

ABSTRACT:
An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further said pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.

REFERENCES:
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patent: 5131478 (1992-07-01), Brett et al.
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patent: 5423389 (1995-06-01), Warren et al.
patent: 5497842 (1996-03-01), Pastusek et al.
Society of Petroleum Engineers, SPE 15617, 1986, Warren, T.M. and Armagost W.K., "Laboratory Drilling Performance of PDC Bits".
Society of Petroleum Engineers, SPE 15618, 1986, Warren, T.M. and Sinor A., "Drag Bit Performance Modeling".

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