Circulating valve for wells
US4360064A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1980 |
| Grant date | Nov 23, 1982 |
| Priority date | — |
| Expiry date | Nov 12, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A circulating (kill) valve for hot, high pressure wells includes a valve assembly to be positioned in an open-ended tubular-shaped side-pocket housing of a mandrel connected into a well tubing string. The valve assembly includes an open-ended cylindrical valve body provided with an interior sealing seat and spaced-apart side openings. A valve element is arranged within the valve body and is urged by unbalanced pressures to the open or closed position depending on the direction of the pressure imbalance. In the closed position a sealing surface on the exterior of the valve element engages and seals with the lower interior sealing seat of the valve body. A ported access to the inner well string pressure permits that pressure to urge the valve element to the closed position. Such pressure may be overcome by pressure imbalance when fluid pressure exterior of the tubing string forces the valve element upwardly from its seat. A wiper seal is arranged on the interior of the valve body and engages the outer surface of the valve element. A ported access to inner tube pressure urges the valve element to the closed position which may be overcome by pressure imbalance when exterior pressure fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.