Adjustable pipe union
US4330141A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1980 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Mar 3, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/043
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An adjustable pipe union for tubing strings including an outer lower mandrel, an inner upper mandrel threaded along a lower end portion into the outer mandrel, packing between the mandrels, an annular seal chamber between the mandrels, a metal-to-metal seal assembly between the mandrels, and a jam nut threaded into an end portion of the outer mandrel around the inner mandrel against the metal-to-metal seal expanding the seal to lock the members together and seal between the members. A short embodiment of the union permits rotational orientation of tubing string apparatus such as valves. A longer embodiment of the union performs a spacing-out function for fitting a tubing string assembly between longitudinally spaced fixed members such as two packers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.