Fmc Corporation

Jeffrey L Mathews

Michael R Williams

David E Cain

Henry Wong

Jimmy D Andrews

A test plug for sealing a bore within a tubing hanger comprising an annular plug body having an axial bore extending therethrough, the axial bore forming a tapered annular seat and an enlarged receptacle within the plug body; a plurality of support dogs retractably mounted within corresponding slots formed in the plug body adjacent a lower portion of the receptacle; a mandrel slidably received within the receptacle, the mandrel having a downwardly and outwardly facing cam surface formed on a lower portion thereof; and a stinger having a tapered closure member adapted to be received in the annular seat, a spring for biasing the closure member against the seat and a seal ring for providing a fluid-tight seal between the closure member and the seat; wherein each support dog comprises an inner beveled edge formed on an upper portion thereof which preferably matches the cam surface of the mandrel, such that when the mandrel is set the cam surface will engage the beveled edge and urge the support dogs into an annular recess formed in the tubing hanger to thereby secure the test plug within the tubing hanger; and wherein the mandrel comprises an inwardly extending annular collar and the stinger comprises an outwardly extending ring forming a downwardly facing annular shoulder which overlaps the collar above the closure member, such that the closure member will not seal against the annular seat unless the mandrel is fully set, and the mandrel will release the closure member from the annular seat during retrieval of the test plug to thereby equalize the pressure above and below the test plug.

Tree test plug

The present invention is directed to a dual backseat valve assembly comprising a valve body having an interior valve chamber and a generally horizontal flow passage; a valve gate adapted to reciprocate vertically within said valve chamber; a valve stem adapted to be received in threaded engagement with a gate lift nut mounted in said gate such that rotation of said stem causes vertical movement of said gate and a valve bonnet fixed to said valve body receiving said stem therethrough; wherein the valve stem comprises a radially extending portion defining a downward facing surface, a first enlarged diameter portion proximate the radially extending portion and a reduced diameter portion adjacent the first enlarged diameter portion; a first backseat seal comprising a radially energized seal ring fixed relative to said bonnet and having a first sealing portion for sealing against said bonnet and a second sealing portion which is adapted to be spaced apart from said reduced diameter portion when said valve is in normal operation and to engage said first enlarged diameter portion only when said stem is in a backseated position with said valve in the open position; a second backseat seal for providing a seal between said stem and said bonnet when said stem is in a backseated position with said valve in the closed position; and a structure fixed relative to said bonnet defining an upward facing surface adapted to engage said downward facing surface when said valve is in the open position to thereby tighten and lock said stem in the backseated position when said stem is moved against the fixed structure.

Growing community of inventors

Singapore, Singapore

Jeffrey L Mathews