Remote sensor for determining proper placement of elevator slips
US6626238B2 · kind B2 · utility
41Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2001 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Jan 1, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for installing pipe such as large diameter casing in a wellbore. Sensors are positioned at a predetermined location at or near the upper surface of elevators suspended from a rig traveling block. As elevators are lowered over a section of pipe, such sensors provide a signal indicating that the elevators are positioned a desired distance below the top of the pipe. The signal alerts an operator that elevators are positioned properly relative to a pipe body so that slips within the elevators will be properly engaged against the outer surface of the pipe and not a connection upset or large diameter external coupling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.