Convertible rotary seal for progressing cavity pump drivehead
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United States of America Patent
Stats
-
Aug 14, 2007
Grant Date -
Feb 16, 2006
app pub date -
Aug 10, 2004
filing date -
Aug 10, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A convertible rotary seal has a housing for receiving a polish rod. A mandrel is rotatably mounted in the seal housing and surrounds the polish rod. A wear sleeve surrounding the mandrel engages a primary seal. A secondary seal engages the mandrel and polish rod and rotates therewith but may be converted for use as a static seal if necessary. A locking mechanism selectively secures the mandrel in a stationary orientation with respect to the seal housing. Fluid that leaks past the primary seal will be detectible through an external orifice. If a leak in the primary seal is detected via the external port, then the mandrel may be secured in a stationary orientation with respect to the housing and the secondary seal may be reconfigured to operate as a stationary seal until such time as the rotary sealing unit can be overhauled.
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