Wells – Screens – Porous material
Patent
1971-08-18
1976-09-14
Purser, Ernest R.
Wells
Screens
Porous material
137471, 137510, E21B 3300, E21B 4300
Patent
active
039801357
ABSTRACT:
An assembly adapted to be anchored at a subsurface location within a tubular well conduit to function as a self-closing safety valve. The assembly includes a flapper valve closure element pivotably mounted in a tubular valve housing and controlled by a pressure sensitive control mechanism. An anchoring means having radially expansible anchoring and sealing members is employed to secure the valve in place and to form a seal which forces fluid in the conduit to flow through a flow passage in the valve housing. The expansible anchoring and sealing means may be retracted to permit retrieval of the entire assembly. The control mechanism includes a pressure charged bellows chamber which moves in response to a drop in the pressure within the well conduit to cause the flapper to close the flow passage.
An incompressible fluid contained within the bellows of the control mechanism cooperates with a double acting valve to prevent over extension or over compression of the bellows by extremes in pressure differential. The force of a compressed spring is suddenly released by movement of the bellows to produce a short, strong movement which is transmitted to the flapper closure element causing it to snap into closed position.
REFERENCES:
patent: 3071151 (1963-01-01), Sizer
patent: 3452777 (1969-06-01), Dollison
patent: 3633670 (1972-01-01), Brown et al.
Ebel Jack E.
Moore Stewart F.
Moseley David L.
Purser Ernest R.
Schlumberger Technology Corporation
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