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US 2026/0071545 A1Published application
Compensation for rotor tilt in hybrid pdm stators
AssigneeAbaco Drilling Technologies LLC
InventorsPeter Thomas Cariveau, Timothy Mark Miller, Jing Lu
Life of this patent
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Abstract
Minor diameter enlargements are engineered into a stator in a positive displacement motor (PDM) power section to relieve stator stress concentrations at the lower (downhole) end of the power section in the presence of rotor tilt. The stator may be a hybrid construction of heterogenous materials.
Claims21
A positive displacement motor (PDM) power section, comprising:
- a rotor and a stator, the rotor configured to be received within the stator, the rotor having a rotor length such that a first portion of the rotor length has a substantially uniform transverse cross-sectional profile;
- the stator having a longitudinal centerline;
- the stator further including an internal liner such that the liner provides the stator with a stator internal surface, wherein the stator internal surface has lobes formed therein, wherein the lobes define helical pathways in the stator internal surface, wherein the helical pathways define a contour length between a contour inlet end and a contour outlet end, wherein the contour length includes an outlet region starting at the contour outlet end and extending up to 25% of the contour length towards the contour inlet end;
- wherein the liner includes an elastomer portion and a non-elastomer portion, wherein the non-elastomer portion extends from the contour outlet end towards the contour inlet end, wherein the non-elastomer portion is either (a) plastic or (b) metal;
- wherein transverse cross-sections of the liner taken orthogonal to the longitudinal centerline provide alternating lobes and valleys around a circumference of the stator such that 2× a distance between the longitudinal centerline and a zenith point of the lobes defines a minor diameter and 2× a distance between the longitudinal centerline and a nadir point of the valleys defines a major diameter;
- wherein the outlet region further includes a first relief length disposed thereon, wherein the first relief length extends between a first relief length inlet towards the contour inlet end and a first relief length outlet towards the contour outlet end;
- wherein the first relief length inlet has a first relief length inlet minor diameter and the first relief length outlet has a first relief length outlet minor diameter;
- wherein the first relief length outlet minor diameter is larger than the first relief length inlet minor diameter by more than 0.0002 inches per inch of first relief length;
- and
- wherein all of the first relief length opposes the first portion of the rotor length when the rotor is received within the stator.
7 more elements
A positive displacement motor (PDM) power section, comprising:
- a rotor and a stator, the rotor configured to be received within the stator, the rotor having a rotor length such that a first portion of the rotor length has a substantially uniform transverse cross-sectional profile;
- the stator having a longitudinal centerline;
- the stator further including an internal liner such that the liner provides the stator with a stator internal surface, wherein the stator internal surface has lobes formed therein, wherein the lobes define helical pathways in the stator internal surface, wherein the helical pathways define a contour length between a contour inlet end and a contour outlet end, wherein the contour length includes an outlet region starting at the contour outlet end and extending up to 25% of the contour length towards the contour inlet end;
- wherein the liner includes an elastomer portion and a non-elastomer portion, wherein the non-elastomer portion is either (a) plastic or (b) metal;
- wherein the non-elastomer portion has a higher modulus than the elastomer portion, wherein the non-elastomer portion extends from the contour outlet end towards the contour inlet end;
- wherein transverse cross-sections of the liner taken orthogonal to the longitudinal centerline provide alternating lobes and valleys around a circumference of the stator such that 2× a distance between the longitudinal centerline and a zenith point of the lobes defines a minor diameter and 2× a distance between the longitudinal centerline and a nadir point of the valleys defines a major diameter;
- wherein the outlet region further includes a first relief length disposed thereon, wherein the first relief length extends between a first relief length inlet towards the contour inlet end and a first relief length outlet towards the contour outlet end;
- wherein the first relief length inlet has a first relief length inlet minor diameter and the first relief length outlet has a first relief length outlet minor diameter;
- wherein the first relief length outlet minor diameter is larger than the first relief length inlet minor diameter by more than 0.0002 inches per inch of first relief length;
- and
- wherein all of the first relief length opposes the first portion of the rotor length when the rotor is received within the stator.
8 more elements
A positive displacement motor (PDM) power section, comprising:
- a rotor and a stator, the rotor configured to be received within the stator, the rotor having a rotor length such that a first portion of the rotor length has a substantially uniform transverse cross-sectional profile;
- the stator having a longitudinal centerline;
- the stator further including an internal liner such that the liner provides the stator with a stator internal surface, wherein the stator internal surface has lobes formed therein, wherein the lobes define helical pathways in the stator internal surface, wherein the helical pathways define a contour length between a contour inlet end and a contour outlet end, wherein the contour length includes an outlet region starting at the contour outlet end and extending up to 25% of the contour length towards the contour inlet end;
- wherein the liner includes an elastomer portion and a non-elastomer portion, wherein the non-elastomer portion is either (a) plastic or (b) metal;
- wherein the non-elastomer portion has a higher modulus than the elastomer portion, wherein the non-elastomer portion extends from the contour outlet end towards the contour inlet end;
- wherein the elastomer portion and the non-elastomer portion are contiguous;
- wherein transverse cross-sections of the liner taken orthogonal to the longitudinal centerline provide alternating lobes and valleys around a circumference of the stator such that 2× a distance between the longitudinal centerline and a zenith point of the lobes defines a minor diameter and 2× a distance between the longitudinal centerline and a nadir point of the valleys defines a major diameter;
- wherein the outlet region further includes a first relief length disposed thereon, wherein the first relief length extends between a first relief length inlet towards the contour inlet end and a first relief length outlet towards the contour outlet end;
- wherein the first relief length inlet has a first relief length inlet minor diameter and the first relief length outlet has a first relief length outlet minor diameter;
- wherein the first relief length outlet minor diameter is larger than the first relief length inlet minor diameter by more than 0.0002 inches per inch of first relief length;
- and
- wherein all of the first relief length opposes the first portion of the rotor length when the rotor is received within the stator.
9 more elements
Dependencies are inferred from the claim text.