Bit-stabilized combination coring and drilling system
US5568838A · kind A · utility
141Cited by
31References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1994 |
| Grant date | Oct 29, 1996 |
| Priority date | — |
| Expiry date | Sep 23, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A core barrel having an inner tube for coring and, alternately, a center plug assembly or closing the throat of the core bit at the bottom of the assembly for drilling in lieu of coring. The inner tube assembly and plug assembly are disposable and retrievable through the drill string on a wireline using an overshot. The core bit is of a stabilized, preferably anti-whirl, design and may be a low-invasion core bit used in cooperation with a low-invasion coring shoe. A logging tool and data transmission assembly may be incorporated in the plug assembly for logging while drilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.