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US 7,255,163 B2Granted
Convertible rotary seal for progressing cavity pump drivehead
OwnerRaymond P. Rivardinventor
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OwnerRaymond P. Rivardinventor
Estimating the term…
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.
A seal for a progressing cavity pump drivehead comprising:
A method of operating a rotary seal comprising the steps of:
A method of operating a rotary seal comprising the steps of:
A well having a progressive cavity pump deployed therein, said well comprising:
A seal for a progressing cavity pump drivehead comprising:
A well having a progressive cavity pump deployed therein, said well comprising:
Dependencies are inferred from the claim text.