Apparatus for measuring the relative position of a downhole tool in a bore hole
US4450539A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1981 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Jul 29, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for accurately determining the relative positioning of a well logging sonde or downhole tool in a bore hole is disclosed. The apparatus comprises an anchor for engaging the wall of the bore hole in fixed position and adapted to be carried into the bore hole on the downhole tool suspended on a logging wireline to a selected level, and a release mechanism controllable from the surface for releasing the anchor from the tool so that the tool can move independently of the anchor element. A sensing cable interconnects the anchor and the tool and is payed out from a reel carried by the tool as the tool separates from the anchor. Means actuated by the sensing cable are provided for transmitting electrical pulses up the wireline to the surface to indicate the relative distance between the anchor and tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.