Apparatus and method for hard rock sidewall coring of a borehole
US7347284B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2004 |
| Grant date | Mar 25, 2008 |
| Priority date | — |
| Expiry date | Jun 6, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention is directed to an apparatus and method for coring a borehole in a hard rock sidewall of a well bore in a subterranean formation for testing purposes. The apparatus includes a drive motor for operation down hole, a flexible drive shaft coupled to the drive motor and a coring bit coupled to the flexible drive shaft, such that the coring bit is directly driven by the drive motor. The apparatus also includes a control circuit for controlling advancement of the coring bit into the subterranean formation. The apparatus also includes a rotating carousel for storing multiple core samples. The method includes the steps of activating the drive motor to rotate the output shaft; coupling the output shaft of the drive motor to the flexible drive shaft and rotating the coring bit with the flexible drive shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.