Well unloading valve
US11851988B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2019 |
| Grant date | Dec 26, 2023 |
| Priority date | — |
| Expiry date | Dec 16, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well unloading valve for a petrochemical well tubing comprising a flow passage connecting an annulus outside the tubing with the inside of the tubing; a lock-out sleeve for selectively closing the flow passage, wherein the lock-out sleeve can be moved from an open to a closed position by means of hydraulic pressure within the tubing; an electrically activated motor module for moving a seal, wherein the seal selectively opens a hydraulic connection from the inside of tubing to the lock-out sleeve for moving the lock-out sleeve hydraulically from the open to the closed position; and a check valve within the flow passage for allowing a flow from the annulus into the tubing and for blocking a flow from the tubing into the annulus. Further a method for unloading a petrochemical well tubing is claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.