Convertible rotary seal for progressing cavity pump drivehead

Details Convertible rotary seal for progressing cavity pump drivehead Convertible rotary seal for progressing cavity pump drivehead

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 15/00 (2006.01) E21B 33/03 (2006.01) F16J 15/34 (2006.01)

Patent

CA 2515616

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 detectable 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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