Subsea manifold stab with integral check valve

Details Subsea manifold stab with integral check valve Subsea manifold stab with integral check valve

1998-03-05

2000-01-04

Tsay, Frank

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166347, E21B 3404

Patent

active

06009950&

ABSTRACT:
A stab for a gas-lift injection line is disclosed which includes a built-in check valve to exclude seawater as the stab is being delivered to the subsea manifold. The check valve can be a spring-loaded poppet which can be pressure-balanced with the surrounding hydrostatic forces, or alternatively, preloaded with the use of a pressurized chamber working in conjunction with a biasing spring to hold the check valve in the closed position during delivery. After insertion of the stab into the subsea manifold, the gas flow begins in the stab, which overcomes the forces of the spring and/or pressurized compartment to push the check valve into the open position to allow gas-lift flow through the manifold and down the annulus into the gas-lift valves in the well. Bypass flow passages are incorporated into the plug to provide an additional force to hold the plug in the open position once the gas-lift pressure is applied so as to prevent chattering of the check valve component in the stab.

REFERENCES:
patent: 4456070 (1984-06-01), Watkins
patent: 4457489 (1984-07-01), Gilmore
patent: 4848472 (1989-07-01), Hopper
patent: 4878783 (1989-11-01), Baugh
patent: 4949938 (1990-08-01), Ekman
patent: 5088558 (1992-02-01), Mohn
patent: 5738172 (1998-04-01), Van Mook et al.

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