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US 2018/0003174 A1Published application
Design and Method to Improve Downhole Motor Durability
AssigneeSchlumberger Technology Corporation
InventorsSamba Ba, Peter T. Cariveau
Life of this patent
Estimating the term…
Abstract
Rotor and/or stator designs and methods thereof to improve progressive cavity motor or pump durability. In one or more implementations, the rotor may have a variable outer diameter or variable stiffness along an axial length thereof. The stator may similarly have a variable inner diameter or variable stiffness, which may compliment or diverge from the variable outer diameter or variable stiffness of the rotor.
Claims20
A progressive cavity motor or pump, comprising:
- a stator with an internal axial bore therethrough, the internal axial bore having an inwardly facing surface with axial lobes arranged and designed to form a stator helical profile;
- and
- a rotor with an outer surface having axial lobes arranged and designed to form a rotor helical profile that is at least partially complimentary to the stator helical profile;
- the rotor being rotationally disposed within the internal axial bore of the stator;
- the axial lobes of the rotor numbering at least one less than the axial lobes of the stator to form a moving chamber between the rotor and stator;
- the rotor having a diameter that varies along an axial length thereof, the diameter of the rotor proximate an uphole end portion thereof being no greater than at a downhole end portion thereof.
3 more elements
A progressive cavity motor or pump, comprising:
- a stator with an internal axial bore therethrough, the internal axial bore having an inwardly facing surface with axial lobes arranged and designed to form a stator helical profile;
- and
- a rotor with an outer surface having axial lobes arranged and designed to form a rotor helical profile that is at least partially complimentary to the stator helical profile;
- the rotor being rotationally disposed within the internal axial bore of the stator;
- the axial lobes of the rotor numbering at least one less than the axial lobes of the stator to form a moving chamber between the rotor and stator;
- the rotor having a variable stiffness along an axial length thereof.
3 more elements
A method of increasing durability of a progressive cavity motor or pump, the method comprising:
- providing a stator with an internal axial bore therethrough, the internal axial bore having an inwardly facing surface with axial lobes arranged and designed to form a stator helical profile;
- providing a rotor with an outer surface having axial lobes arranged and designed to form a rotor helical profile that is at least partially complimentary to the stator helical profile;
- the rotor being rotationally disposed within the internal axial bore of the stator;
- the axial lobes of the rotor numbering at least one less than the axial lobes of the stator to form a moving chamber between the rotor and stator;
- the rotor having a variable diameter along an axial length thereof;
- and
- varying rotor diameter along the axial length of the rotor to increase rotor stiffness toward a downhole end portion of the rotor.
4 more elements
Dependencies are inferred from the claim text.