Pressure range delimited valve with close assist
US8757267B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2011 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Aug 23, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure-actuated valve fit to a tubing string for alternately closing to communicate fluids from a wellbore to the tubing string and opening to communicate fluids from a wellbore annulus to the tubing string. The valve is particularly useful for lifting liquids which accumulate in the tubing string when the reservoir has a diminished pressure. In this case, gas is accumulated in the wellbore annulus and when the valve is opened the gas enters the valve and is directed to the tubing string for lifting the liquids. The valve is closed by a spring and has a closing-assist which applies an additional force to the spring to ensure the valve is fully closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.