Wells – Above ground apparatus – With seal for reciprocating member
Patent
1995-06-06
1996-08-27
Schoeppel, Roger J.
Wells
Above ground apparatus
With seal for reciprocating member
74 41, E21B 3402
Patent
active
055491561
ABSTRACT:
A safety shock absorber and wiper for use in an oil well pumping unit and attached to the top of a stuffing box. The shock absorber and wiper is constructed of a high density elastomeric material which is designed to absorb the shock created in the event a polished rod breaks or slips out of the polished rod clamp and the polished rod liner head falls and impacts the top of the stuffing box. A series of circular lip seals are formed on the inside of a passage which receives the polished rod liner. The lip seals make contact with and wipe the polished rod liner. A rigid ring is encased near the bottom of the device to provide a rigid portion so that the device can be secured to the stuffing box in such a manner as to compress a seal and prevent leaks around the mating surface. The device additionally contains a lubricant cavity so that a polished rod liner receives lubricant during start-up and all times during the pumping operation to reduce the wear, friction, and corrosion of and to the stuffing box packing and the polished rod liner. By wiping the polished liner, the device helps to contain the excess oil that normally accumulates on top of the stuffing box. Additionally, the wiper wipes off abrasive material which may stick to the wet surface of the polished rod or liner. This serves to prevent additional wear on the stuffing box packing.
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