Combination packer/safety valve assembly for gas storage wells
US5305828A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1993 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Apr 26, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/1295
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A combination packer/safety valve assembly is connectable to the bottom end of a tubing string and lowerable therewith into the casing string portion of a gas storage well to control the upward flow through the casing string of pressurized gas stored in a subterranean cavern below the casing string. In response to the delivery through the tubing string to the interior of the assembly of control fluid at a first predetermined pressure a normally closed, axially extending interior passage of the assembly is opened to permit upward flow therethrough of pressurized gas for delivery to the well surface through the casing string. An increase of the control fluid pressure to a higher, predetermined second magnitude radially extends an anchor slip and packer structure externally carried by the assembly body into an anchored, sealing engagement with the interior surface of the casing string, and a locking structure automatically functions to hold the anchor slip and packer structure in this radially extended orientation. A subsequent increase of the control fluid pressure to a still higher, predetermined third magnitude causes the anchor slip and packer structure to be driven back to a radi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.