Wells – Processes – Placing or shifting well part
Reexamination Certificate
2005-10-21
2009-06-09
Bagnell, David J (Department: 3676)
Wells
Processes
Placing or shifting well part
C166S332100, C166S332800
Reexamination Certificate
active
07543651
ABSTRACT:
The present invention generally relates to a non-elastomeric cement through tubing retrievable safety valve configured to control fluid flow through a production tubing string. In one aspect, a valve for use in a wellbore is provided. The valve includes a tubular body. The valve further includes a flow tube having a bore therethrough, wherein the flow tube is disposed in the tubular body to form an annular area therebetween. The valve further includes a flapper movable between an open position and a closed position in response to the movement of the flow tube. Additionally, the valve includes a sealing system constructed and arranged to substantially isolate the annular area from the bore, thereby substantially eliminating the potential of contaminants in the bore from entering into the annular area. In another aspect, a method of controlling fluid in a wellbore is provided.
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Duncan George C.
Smith Roddie R.
Wagner Nathaniel H.
Bagnell David J
Fuller Robert E
Patterson & Sheridan L.L.P.
Weatherford / Lamb, Inc.
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