Balance line control system with reset feature for floating piston
US10294751B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2016 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | May 20, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An operating control line is in communication with an operating piston for the safety valve as well as an equalizing piston such that pressure in the operating control line opens the safety valve and holds the equalizer valve closed. A balance chamber receives fluid from an operating piston in the safety valve when the valve opens to displace a floating piston to the open position. Operating control line pressure reduction allows valve closure and opposite floating piston movement to the closed position. If the floating piston is forced by a tubing seal leak against the open position travel stop, pressure in a balance control line against the equalizing valve member moves it from a seat to then equalize pressure on opposed ends of the floating piston allowing a bias force to move the floating piston off the open position stop so the safety valve can open despite the tubing leak.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.