Method for deploying extendable arm for formation evaluation MWD tool
US5242020A · kind A · utility
44Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1990 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Dec 17, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An extending arm is incorporated into a formation evaluation MWD collar or sub for extending outwardly from the tool and maintaining direct and continuous contact with the borehole wall (e.g., formation). In accordance with this invention, a method is presented for intermittently deploying the extendable arm and thereby decreasing drilling interference (caused by the arm) and avoiding the damage caused by accidents involving a nuclear source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.