Diamond drag bit for soft formations
US4981184A · kind A · utility
155Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1988 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Nov 21, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/60
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drag bit for soft formation is disclosed which consists of a new cutting mechanism. The drag bit face forms one or more pairs of radially disposed ridges separated by a valley whereby a leading ridge supports multiple rounded projections and the following ridge supports multiple positive rake angle cutters. The rounded projection elements move aside an elastic earth formation and the separated and trailing cutters clip off the dislodged formation to advance the bit in a borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.