Variable positioning deep cutting rotary coring tool with expandable bit
US7673704B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2006 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Sep 25, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A coring device includes a primary and a secondary bit that drill a first and second depth into a formation, respectively. The first and second bits are positioned on telescopically arranged mandrels that are rotated by a suitable rotary drive. The coring tool also includes a drive device that extends the first bit and the second bit a first depth into the formation and extends only the second bit a second depth into the formation. In arrangements, the actuating device can include a first hydraulic actuator applying pressure to extend the second bit into the formation and a second hydraulic actuator applying pressure to retract the second bit from the formation. The advancement and retraction of the first and second bits can be controlled by a control unit that uses sensor signals, timers, preprogrammed instruction and any other suitable arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.