E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/08 (2006.01) E21B 10/56 (2006.01) E21B 17/10 (2006.01)
Patent
CA 2261917
Enhanced inserts are formed having a cylindrical grip and a protrusion extending from the grip. An ultra hard material layer is bonded on top of the protrusion. The inserts are mounted on a rock bit and contact the earth formations off center. The ultra hard material layer is thickest at a critical zone which encompasses a major portion of the region of contact between the insert and the earth formation. Transition layers may also be formed between the ultra hard material layer and the protrusion so as to reduce the residual stresses formed on the interface between the ultra hard material and the protrusion.
Anderson Nathan R.
Belnap J. Daniel
Cawthorne Chris E.
Eyre Ronald K.
Keshavan Madapusi K.
Oyen Wiggs Green & Mutala Llp
Smith International Inc.
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