Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1991-01-30
1992-09-08
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175374, 175426, E21B 1016
Patent
active
051450160
ABSTRACT:
An improved rotary rock bit having a circumferential row of wear resistant inserts protruding from the gage surface of each rolling cone cutter. The inserts are designed to efficiently break and remove earth formations. Adequate clearance is provided around the gage inserts for chip formation, chip removal, and insert cooling. These rows of inserts provide reaming action to maintain borehole gage diameter after the primary gage cutting structure has worn or failed.
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"Introducing Smith Tool's New Steerable-Motor Bits", Journal of Petroleum Technology, Oct. 1990.
Bagnell David J.
Rock Bit International, Inc.
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