Drill bit and cutting inserts for hard/abrasive formations
US7690442B2 · kind B2 · utility
16Cited by
101References
53Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2006 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Nov 20, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/52
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rolling cone drill bit comprises a plurality of bottomhole cutter elements positioned in a first circumferential row, wherein at least one of the cutter elements comprises a cutting portion extending from a base portion to a point furthermost from the base portion, defining an extension height. The ratio of the cross-sectional area of the cutter element at a point equal to ninety-four percent of the extension height to the cross-sectional area of the cutter element base is greater than 0.2. Moreover, the ratio of the extension height to the base diameter is not greater than 0.75.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.