Well bore measurement tool
US4673890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1986 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Jun 18, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A caliper is mounted on two springs in a free-floating manner between interlockable upper and lower packers to be set in a well bore. The caliper has radially extendible arms which are extendible in response to independent forces exerted thereon as derived from the movement of a carriage driven by a single motor contained in the caliper tool. A clutch mechanism is used to lock the arms to precision measurement transducers only after the arms have been moved radially outwardly a sufficient distance. Other transducers for generating signals indicating the total movement of the arms and for indicating the forces exerted by the springs on the arms are included in the preferred embodiment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.