Hydraulically controlled safety valves for incorporation in production tubes of hydrocarbon production wells
US4651827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1986 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | May 14, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1677
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety valve for use in a hydrocarbon production tube comprises a valve member which is opened by a piston tube displaceable as a result of the intake of hydraulic fluid into an operating chamber therefor, and a tubular receptacle for receiving an auxiliary safety valve recoverable by means of a cable. The receptacle is longitudinally displaceable between inactive and active positions and is engaged telescopically with the piston tube in a sealed manner to define, with the piston tube, the operating chamber. The receptacle is normally retained in its inactive position by shearable elements, but after the elements have been sheared, descends to its active position simultaneously driving the piston tube to its lower position to open the valve member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.