COMPONENTS AND MOTORS FOR DOWNHOLE TOOLS AND METHODS OF APPLYING HARDFACING TO SURFACES THEREOF

• US 20150259983A1
• Filed: 05/28/2015
• Published: 09/17/2015
• Est. Priority Date: 07/23/2010
• Status: Active Grant

• Current Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Original Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Inventors: Puzz, Travis E., Overstreet, James L., Eason, Jimmy W.
• Granted Patent: US 10,077,605 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E21B 4/02 Fluid rotary type drives
• CPC Class Codes: F03C 2/08 of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
• CPC Class Codes: F04C 13/008 Pumps for submersible use, i.e. down-hole pumping
• CPC Class Codes: F04C 2/1075 Construction of the stationary member
• CPC Class Codes: F04C 2230/91 Coating
• CPC Class Codes: F04C 2270/16 Wear
• CPC Class Codes: F05C 2225/00 Synthetic polymers, e.g. plastics; Rubber
• CPC Class Codes: F05C 2251/10 Hardness
• CPC Class Codes: F05C 2253/04 Composite, e.g. fibre-reinforced
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor

Abstract

A component for a downhole tool includes a rotor and a hardfacing precursor. The hardfacing precursor includes a polymeric material, hard particles, and a metal. A hydraulic drilling motor includes a stator, a rotor, and a sintered hardfacing material on an outer surface of the rotor or an inner surface of the stator. Methods of applying hardfacing to surfaces include forming a paste of hard particles, metal matrix particles, a polymeric material, and a solvent. The solvent is removed from the paste to form a sheet, which is applied to a surface and heated. A component for a downhole tool includes a first hardfacing material, a second hardfacing material over the first hardfacing material and defining a plurality of pores, and a metal disposed within at least some of the pores. The metal has a melting point lower than a melting point of the second hardfacing material.

Claims

1. An apparatus for downhole service, comprising:

a rotor configured to be rotatably disposed within a stator; and

a hardfacing precursor disposed over at least a portion of an outer surface of the rotor, the hardfacing precursor comprising;

a polymeric material;

a plurality of hard particles dispersed within the polymeric material; and

a metal formulated to become a matrix material.

2. The apparatus of claim 1, further comprising a stator having another hardfacing precursor disposed over at least a portion of an inner surface thereof, the another hardfacing precursor comprising a polymeric material, a plurality of hard particles dispersed within the polymeric material, and a metal formulated to become a matrix material.

3. The apparatus of claim 1, wherein the metal comprises a plurality of metal matrix particles dispersed within the polymeric material, the plurality of metal matrix particles having a melting temperature higher than about 350°

C.

4. The apparatus of claim 1, wherein the hardfacing precursor further comprises:

a first layer comprising a bonding material;

a second layer comprising a first weight fraction of hard particles; and

a third layer comprising a second weight fraction of hard particles, the second weight fraction of hard particles being greater than the first weight fraction of hard particles.

5. The apparatus of claim 1, wherein the rotor comprises:

at least two lobes having thereon a first hardfacing precursor formulated to form a first hardfacing material upon sintering; and

an area between the at least two lobes having thereon a second hardfacing precursor formulated to form a second hardfacing material upon sintering;

wherein the first hardfacing material has at least one mechanical property different from a mechanical property of the second hardfacing material, the at least one mechanical property selected from the group consisting of wear resistance, hardness, corrosion resistance, bonding strength, and combinations thereof.

6. The apparatus of claim 1, wherein the polymeric material comprises a material selected from the group consisting of styrene-butadiene-styrene, styrene-ethylene-butylene-styrene, styrene-divinylbenzene, styrene-isoprene-styrene, and styrene-ethylene-styrene.

7. The apparatus of claim 1, wherein the hardfacing precursor comprises:

a first precursor having a first composition, the first precursor comprising;

a first polymeric material;

a first plurality of hard particles dispersed within the first polymeric material; and

a first metal formulated to become a first matrix material; and

a second precursor having a second composition different from the first composition, the second precursor comprising;

a second polymeric material;

a second plurality of hard particles dispersed within the second polymeric material; and

a second metal formulated to become a second matrix material.

8. The apparatus of claim 7, wherein the first hardfacing precursor is disposed on at least two lobes of the rotor, and wherein the second hardfacing precursor is disposed between the at least two lobes of the rotor.

9. The apparatus of claim 1, wherein the hardfacing precursor comprises a carrier member, the carrier member comprising the polymeric material, and wherein the carrier member is impregnated with the plurality of hard particles and the metal.

10. The apparatus of claim 1, wherein the plurality of hard particles comprises at least one material selected from the group consisting of diamond, boron carbide, cubic boron nitride, aluminum nitride, carbides, oxides, and borides.

11. The apparatus of claim 1, wherein the metal exhibits a melting temperature of at least about 800°

C.

12. The apparatus of claim 1, wherein the metal comprises at least one material selected from the group consisting of cobalt, cobalt-based alloys, iron, iron-based alloys, nickel, nickel-based alloys, cobalt- and nickel-based alloys, iron- and nickel-based alloys, iron- and cobalt-based alloys, aluminum-based alloys, copper-based alloys, magnesium-based alloys, and titanium-based alloys.

13. The apparatus of claim 1, wherein the metal comprises a plurality of metal particles substantially free of pores.

14. A method of applying hardfacing to a surface of a hydraulic drilling motor component, the method comprising:

dispersing a plurality of hard particles and a plurality of metal particles within a polymeric material to form a hardfacing precursor, wherein the metal particles are formulated to become a matrix material; and

applying the hardfacing precursor over at least a portion of an outer surface of a rotor, the rotor configured to be rotatably disposed within a stator.

15. The method of claim 14, further comprising heating the hardfacing precursor to form a sintered hardfacing material on the outer surface of the rotor, the sintered hardfacing material comprising a composite material having a relatively hard first phase distributed within a second, continuous matrix phase, the second phase comprising a metal or a metal alloy.

16. The method of claim 14, further comprising:

dispersing a second plurality of hard particles and a second plurality of metal particles within a second polymeric material to form a second hardfacing precursor having a composition different than the hardfacing precursor; and

disposing the second hardfacing precursor over at least a portion of the outer surface of the rotor.

17. The method of claim 16, further comprising disposing the hardfacing precursor on at least two lobes of the rotor and disposing the second hardfacing precursor between the at least two lobes.

18. The method of claim 14, wherein dispersing a plurality of hard particles and a plurality of metal particles within a polymeric material to form a hardfacing precursor comprises forming a hardfacing precursor sheet in situ on the outer surface of the rotor.

19. The method of claim 14, wherein dispersing a plurality of hard particles and a plurality of metal particles within a polymeric material to form a hardfacing precursor comprises forming a multi-layer hardfacing precursor sheet.

20. The method of claim 14, wherein applying the hardfacing precursor over an outer surface of a rotor comprises applying an adhesive between the hardfacing precursor and the outer surface of the rotor.