Liquid level actuated sleeve valve
US4771831A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Oct 6, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tubing retrievable, hydrostatically operated liquid sleeve valve to control and shut off well production to the well surface of a producing well. The sleeve valve includes a port for supplying production fluid through the well annulus for pumping. When the pump stops, the liquid level in the annulus rises and creates a hydrostatic head against a sleeve piston which is biased to the open position by a gas charge. When the liquid reaches a selected level, the valve will move to a closed position. When the pump is reactivated, the liquid level is lowered and the valve is moved to the open position. Low friction seals minimize friction and a dynamic seal is set after the valve is shifted to the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.