Core cutting rock bit
US5394952A · kind A · utility
25Cited by
2References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Aug 24, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roller cone drill bit is disclosed that leaves uncut a substantial formation core having a diameter from 10% to 25% of the bit gage diameter. The bit is designed to have normal size bearings, cone shell thickness and cutter protrusion to allow the use of standard drilling weights and RPM, thereby achieving a significant increase in drilling rate. When drilling abrasive formations, ultra hard cutting teeth are used in the cone apex to maintain the core diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.