Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate
2005-03-01
2005-03-01
Tsay, Frank (Department: 3672)
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
C166S320000, C166S386000
Reexamination Certificate
active
06860330
ABSTRACT:
A choke valve assembly is disclosed for controlling the flow of fluid through a production tubing. The valve assembly includes a housing having a plurality of axially aligned apertures and a ported sleeve disposed in the housing. The ported sleeve has a plurality of rows of fluid ports. Each row of ports has at least one port in selective fluid communication with a respective aperture. In the full open position, each aperture is in fluid communication with a port from each row. To choke the flow, the ported sleeve is rotated relative to the housing to reduce the number of ports in fluid communication with the housing. To close the valve, axial force is applied to move the ported sleeve axially relative to the housing.
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U.K. Search Report, Application No. GB0329137.4, dated Apr. 26, 2004.
Moser, Patterson & Sheridan L.L.P.
Tsay Frank
Weatherford / Lamb, Inc.
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