GROUND DRIVE APPARATUS FOR PROGRESSIVE CAVITY PUMPS
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United States of America Patent
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Issued Date -
Feb 25, 2016
app pub date -
Aug 22, 2014
filing date -
Aug 22, 2014
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Abstract
A ground drive apparatus for a progressive cavity pump in which a rotor of the pump is connected to a rod string and in which the rod string is connected to the polished rod. The ground drive apparatus has a motor with a hollow shaft, an upper sealing structure positioned above the motor and extending around the polished rod, and a well sealing structure positioned below the motor so as to the selectively in sealing and clamping relationship with the polished rod. The hollow shaft has an inner diameter greater than an outer diameter of the rotor and the rod string. The upper sealing structure includes a stationary sealing cap, a rotary sealing bushing extending around the stationary sealing cap, and a sealing ring interposed between the stationary sealing cap and the rotary sealing bushing. The well sealing structure has a housing with a piston slidably mounted in the housing.
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