Progressive cavity pump and method for operating same in boreholes
AssigneeHusky Oil Operations Limited
InventorStephen Gerard Barbour
Life of this patent
Estimating the term…
Abstract
A method for operating a progressive cavity pump wherein the stator has at least first and second active stator sections that are at different locations on the stator, comprising inserting a first rotor having a first active rotor section that is aligned with the first active stator section, and rotating the first rotor relative to the first active stator section such that the aligned first active rotor and stator sections generate a pumping force. Subsequently, the first rotor is removed and a second rotor is inserted having a second active rotor section that is aligned with the second active stator section, and rotating the second rotor relative to the second active stator section such that the aligned second active rotor and stator sections generate a pumping force.
Claims7
A progressive cavity pump assembly for operation in a borehole, comprising:
- (a) a unitary stator comprising at least first and second active stator sections at different locations on the stator;
- (b) a first rotor having a first active rotor section that is configured for alignment with the first active stator section when the first rotor is positioned at a selected location relative to the stator;
- and
- (c) a second rotor separate from the first rotor and configured for insertion into the stator independently of the first rotor such that only one of the first rotor and the second rotor is capable of insertion within the stator at a given time, the stator configured to receive only one of the first rotor and the second rotor at a given time, and the second rotor having a second active rotor section that is configured for alignment with the second active stator section when the first rotor is absent from the stator and the second rotor is positioned at the selected location relative to the stator, the first rotor and the second rotor configured for separate and serial operation within the stator.
Dependencies are inferred from the claim text.