Bearing/gearing section for a PDM rotor/stator
AssigneeSchlumberger Technology Corporation
InventorsFrancois Clouzeau, Maxim Pushkarev, Lance D. Underwood, Bassam Mansour
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Abstract
A moving or progressive cavity motor or pump is disclosed, the motor including a rotor and a stator, the stator having one or more inserts or gearing sections to limit a lateral movement of the rotor relative to the stator. In some embodiments, the motor or pump may include a rotor and a stator, the stator including: a first, helicoidal, section comprising a compliant material having a first compressibility; a second section, helicoidal, non-helicoidal, or combination thereof, having a second compressibility, wherein the second compressibility is less than the first compressibility.
Claims20
A moving or progressive cavity motor or pump comprising:
- a rotor deployed in a stator, the rotor having an outer helicoidal surface;
- and
- the stator comprising:
- an outer cylindrical housing;
- a helicoidal section deployed in the outer cylindrical housing, the helicoidal section having a solid rubber profile and a helicoidal inner surface, the helicoidal section configured to receive the rotor;
- and
- at least one ring-shaped insert deployed in the outer cylindrical housing, the at least one ring-shaped insert having a corresponding helicoidal inner surface, the at least one ring-shaped insert having a compressibility that is less than a compressibility of the helicoidal section, the at least one ring-shaped insert configured to constrain lateral movement of the rotor with respect to the stator;
- wherein the at least one ring-shaped insert has an axial length in a range from about 2 to about 50 millimeters and the stator has an overall axial length in a range from about 1 to about 10 meters.
A moving or progressive cavity motor or pump comprising:
- a rotor deployed in a stator, the rotor having an outer helicoidal surface;
- and
- the stator comprising:
- an outer cylindrical housing;
- first and second helicoidal sections deployed in the outer cylindrical housing, the helicoidal sections having a solid rubber profile and a helicoidal inner surface, the helicoidal sections configured to receive the rotor;
- and
- first, second, and third axially spaced, ring-shaped inserts deployed in the outer cylindrical housing, each of the first, second, and third ring-shaped inserts having a corresponding helicoidal inner surface, the first and second ring-shaped inserts deployed axially about the first helicoidal section and the second and third ring-shaped inserts deployed axially about the second helicoidal section, all of the first, second, and third ring-shaped inserts having a compressibility that is less than a compressibility of the helicoidal section and being configured to constrain lateral movement of the rotor with respect to the stator.
A moving or progressive cavity motor or pump comprising:
- a rotor deployed in a stator, the rotor having an outer helicoidal surface;
- and
- the stator comprising:
- an outer cylindrical housing;
- a helicoidal section deployed in the outer cylindrical housing, the helicoidal section having a solid rubber profile and a helicoidal inner surface, the helicoidal section configured to receive the rotor;
- and
- at least one ring-shaped insert deployed in the outer cylindrical housing, the at least one ring-shaped insert having a corresponding helicoidal inner surface, the at least one ring-shaped insert having a compressibility that is less than a compressibility of the helicoidal section, the at least one ring-shaped insert configured to constrain lateral movement of the rotor with respect to the stator;
- wherein the helicoidal inner surface of the at least one ring-shaped insert has a reduced helicoidal profile with respect to the helicoidal inner surface of the helicoidal section.
Dependencies are inferred from the claim text.