Insert gas lift system

Details Insert gas lift system Insert gas lift system

1997-11-12

1999-01-26

Tsay, Frank S.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166386, E21B 3406

Patent

active

058628657

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.

REFERENCES:
patent: 3799258 (1974-03-01), Tausch
patent: 4071088 (1978-01-01), Mott
patent: 4215746 (1980-08-01), Hallden et al.
patent: 4460046 (1984-07-01), Pringle
patent: 4478288 (1984-10-01), Bowyer
patent: 4534414 (1985-08-01), Pringle
patent: 4660647 (1987-04-01), Richart
patent: 4729433 (1988-03-01), Jacob
patent: 4771633 (1988-09-01), Jacob
patent: 4776399 (1988-10-01), Jacob
patent: 5526883 (1996-06-01), Breaux

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