Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1998-01-28
1999-06-29
Suchfield, George
Wells
Valves, closures or changeable restrictors
Fluid operated
166372, E21B 3408
Patent
active
059154780
ABSTRACT:
An improved standing valve which regulates the amount of accumulated fluid in the tubing string of an oil and gas well, to an amount that is within the purging capability of the gas-lift method. The present invention provides a hydrostatic standing valve with a floating valve seat which is displaced in response to the weight of an accumulated fluid head. A ball seals against the floating valve seat and floats with it, but the displacement of the ball is limited by a positive stop provided by a rod supported by the standing valve body. When the valve seat displaces beyond that of the ball, as limited by the positive stop, the ball is sealingly disengaged from the valve seat and fluid flows out of the tubing string. The dynamic response of the spring to the weight of the fluid head regulates the accumulated head to not exceed a predetermined amount so that the fluid head can be predicted and regulated below an amount that can be reliably purged by conventional gas-lift methodologies, either continuous or intermittent.
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Brown Henry F.
Brown Jeffrey J.
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