Tubing manipulated test valve and latch assembly
US4212355A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Sep 11, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A test valve assembly is provided which is adapted to be lowered on a tubular string between upper and lower tubular sections into position within a blowout preventer stack at the upper end of a well bore of a subterranean oil or gas well. The apparatus has first and second fluid flow passageways within a housing. A valve member is disposed between the flow passageways and is shiftable to open position to communicate the flow passageways during selective incremental testing of the well and is manipulatable to closed position to isolate the flow passageways prior to and subsequent to selective incremental testing of the well. Means are provided which are responsive to mechanical manipulation of the tubular string for shifting of the valve member between closed and open positions. The apparatus and the tubular string may be selectively latched with respect to one another without manipulation of the valve member between closed and open positions. Clutch means are provided whereby the upper tubular section may be selectively rotationally engaged with the lower tubular section during testing of the well and when the valve member is in open position. Auxiliary hydraulically activated val…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.