Rotor placer for progressive cavity pump
OwnerJames L. Weberinventor
Life of this patent
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Abstract
A progressive cavity pump is used as part of the production string in an oil well. A pump stator is coupled to the production tubing string, while the rotor is driven by a sucker rod. To ensure proper placement of the rotor in the stator, the rotor is driven by a drive shaft with two universal joints with the upper end of the drive shaft held in position by a thrust bearing on the drive shaft and engaging a bearing seat connected to the production tubing. This ensures proper vertical placement of rotor in the stator. It also prevents eccentric motion of the upper end of the drive shaft, so that the sucker rod is no longer subject to whipping action that may damage the production tubing and the sucker rod string.
Claims14
A rotor placer for use in an oil well having production tubing, a progressive cavity pump with a stator coupled to the production tubing and a rotor rotatable in the stator, and sucker rod means coupled to the rotor for rotating the rotor in the stator, said rotor placer comprising:
- drive shaft means with a lower end for driving connection with the rotor and an upper end for driven connection to the sucker rod means;
- bearing means connected to the drive shaft at a fixed position therealong;
- bearing seat means for connection to the production tubing at a fixed position therealong and engageable with the bearing means so as to limit movement of the bearing means along the production tubing towards the stator.
An oil well having production tubing, a progressive cavity pump including a stator coupled to the production tubing and a rotor rotatable in the stator, a sucker rod string for rotating the rotor in the stator for pumping oil through the production tubing, and a rotor placer, said rotor placer comprising:
- a drive shaft connected between the sucker rod string and the rotor;
- bearing means mounted on the drive shaft at a fixed position therealong;
- and above the rotor and engaged with the bearing means for preventing movement of the bearing means and the drive shaft towards the stator.
Dependencies are inferred from the claim text.