Insert gas lift system
US5862865A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1997 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Nov 12, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An insert tool for pre-existing casing is disclosed which allows the use of existing control line connections to facilitate independent operation of a pair of safety valves. The insert is particularly useful when a pre-existing well is converted to gas lift operation and requires the use of downhole valves, such as tubing safety valve in combination with an annular-type safety valve. The tool can be readily reconfigured if one of the control lines becomes obstructed so that continuing independent operation of the two valve components can continue. Normal and emergency release techniques are also included when it is time to retrieve the insert assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.