Method and apparatus for pipe joint locator, counter and displacement calculator
US4110688A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1976 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Sep 20, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is a novel method and apparatus for counting pipe joints, passing through a bell nipple, going downhole and uphole by sensing, at spaced apart positions along the nipple utilizing magnetic fields, for the presence of a joint. Each sensor develops signals as the joint passes it and a logical network determines which direction the pipe joint is traveling, adds a plus count to the joint counter for joints going downhole and subtracts a minus count from the joint counter when a joint is sensed coming uphole. Another logical circuit converts the joint count to a stand count, and the negative signals from the stand count trigger an adder network to introduce a binary number to a numeric read-out display, which number is indicative of pipe displacement per stand, withdrawn from hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.