Method of forming stators for downhole motors

Patent metadata

Field	Value
Publication number	US-11319753-B2
Application number	US-202117142519-A
Country	US
Kind code	B2
Filing date	Jan 6, 2021
Priority date	Feb 21, 2017
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A stator for a downhole motor configured for use in a downhole environment. includes an inner tubular member formed from a first metallic material having an outer surface and a helically lobed inner surface, and an outer tubular member comprising a second metallic material that is different from the first metallic material. The inner tubular member is connected to the outer tubular member by compressive force passing from the outer tubular member through the inner tubular member to a rigid mandrel removably disposed within the inner tubular member. The inner tubular member and the outer tubular member form the stator of the downhole motor.

First claim

The invention claimed is:

1. A stator for a downhole motor configured for use in a downhole environment comprising:
an inner tubular member formed from a first metallic material having an outer surface and a helically lobed inner surface; and
an outer tubular member comprising a second metallic material that is different from the first metallic material, wherein the inner tubular member is connected to the outer tubular member by a compression bond established by a compressive force imparted to the outer tubular member and a reaction force imparted to the inner tubular member, wherein the inner tubular member and the outer tubular member form the stator of the downhole motor.

2. The downhole motor according to claim 1 , wherein the first metallic material is more pliable than the second metallic material.

3. The downhole motor according to claim 1 , further comprising: one or more channels extending between the inner tubular member and the outer tubular member.

4. The downhole motor according to claim 3 , wherein the one or more channels is formed in a third material defined between the inner tubular member and the outer tubular member.

5. The downhole motor according to claim 3 , wherein the one or more channels define a conduit for one of an electrical cable and a hydraulic line.

6. The downhole motor according to claim 1 , further comprising: an inner layer provided on the helically lobed inner surface.

7. The downhole motor according to claim 6 , wherein the inner layer comprises an elastomeric material.

8. The downhole motor according to claim 6 , wherein the inner layer is formed from one of a metallic material, and ceramic.

9. The downhole motor according to claim 6 , wherein the inner layer is formed from one of graphite, and diamond-like carbon.

10. The downhole motor according to claim 6 , wherein the inner layer is formed from a thermo-plastic material.

11. The downhole motor according to claim 1 , wherein the inner tubular member is formed from a metal alloy.

12. The downhole motor according to claim 1 , wherein the first metallic material comprises Copper.

13. The downhole motor according to claim 1 , wherein the first metallic material comprises Nickel.

14. The downhole motor according to claim 1 , wherein the first metallic material comprises Molybdenum.

15. The downhole motor according to claim 1 , wherein the first metallic material comprises Steel.

16. The downhole motor according to claim 1 , further comprising an additional layer between the inner tubular member and the outer tubular member.

Assignees

• Baker Hughes A Ge Co Llc

Inventors

• Huber Witali
• Michaelis Gunnar
• Hohl Carsten
• Bartscherer Erik
• Grimmer Harald
• Fulda Christian
• Fischer Dorothea Marion
• Regener Thorsten

Classifications

• E21B4/02 Primary

  Fluid rotary type drives · CPC title

• F04C2230/26

  by rolling · CPC title

• H02K15/02

  of stator or rotor bodies · CPC title

• F04C2/107

  with helical teeth · CPC title

• F04C2/1075

  Construction of the stationary member · CPC title