Fiber reinforced elastomeric stator

Patent metadata

Field	Value
Publication number	US-10844663-B2
Application number	US-201715468204-A
Country	US
Kind code	B2
Filing date	Mar 24, 2017
Priority date	Feb 21, 2012
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

Embodiments disclosed herein relate to a composition useful for forming a stator or a portion thereof. The composition may include: a curable elastomer; a fiber or fibrous compound; a fiber dispersion compound; and optionally carbon black.

First claim

What is claimed:

1. A positive displacement drilling motor comprising:
a rotor deployed in a stator, the rotor configured to rotate eccentrically in the stator when drilling fluid passes through the motor;
wherein the stator comprises an elastomeric stator liner deployed in a stator tube, the elastomeric stator liner comprising:
a curable elastomer;
from about 1.25 to about 1.75 phr aramid fibers;
from about 0.5 to about 15 phr amorphous silicon dioxide having a surface area in a range from about 10 m 2 /g to about 30 m 2 /g; and
from about 10 to about 100 phr carbon black;
wherein phr is defined as parts per hundred parts of the curable elastomer, and wherein the aramid fibers are dispersed through the curable elastomer.

2. The drilling motor of claim 1 , wherein the elastomeric stator liner comprises from about 1.5 to about 1.75 phr aramid fibers.

3. The drilling motor of claim 1 , wherein the amorphous silicon dioxide is spherical.

4. The drilling motor of claim 1 , wherein the amorphous silicon dioxide has an average particle size in a range from about 30 nm to about 300 nm.

5. The drilling motor of claim 1 , wherein the curable elastomer comprises at least one of nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), fluoroelastomer (FKM), fluoro ethylene/propylene rubbers (FEPM), and perfluoroelastomers (FFKM).

6. The drilling motor of claim 1 , wherein the curable elastomer comprises at least one of NBR or HNBR and has a Mooney Viscosity (ML(1+4) at 121° C.) in a range from about 20 to about 120.

7. The drilling motor of claim 1 , wherein the elastomeric stator liner further comprises one or more curatives and/or activators, each in an amount ranging from about 1 to about 50 phr.

8. A positive displacement drilling motor comprising:
a rotor deployed in a stator, the rotor configured to rotate eccentrically in the stator when drilling fluid passes through the motor;
wherein the stator comprises an elastomeric stator liner deployed in a stator tube, the elastomeric stator liner comprising:
a curable elastomer;
from about 0.5 to about 1.8 phr fibrous material;
from about 0.5 to about 36 phr silicon dioxide; and
from about 10 to about 100 phr carbon black;
wherein phr is defined as parts per hundred parts of the curable elastomer, and wherein the silicon dioxide has a surface area in a range from about 10 m 2 /g to about 30 m 2 /g.

9. The drilling motor of claim 8 , wherein the silicon dioxide has an average particle size in a range from about 30 nm to about 300 nm.

10. The drilling motor of claim 8 , wherein the silicon dioxide is an amorphous silicon dioxide.

11. The drilling motor of claim 8 , wherein the elastomeric stator liner comprises from about 0.5 to about 15 phr of the silicon dioxide.

12. The drilling motor of claim 8 , wherein the fibrous material comprises an aramid fiber.

13. The drilling motor of claim 8 , wherein the fibrous material of the elastomeric stator liner comprises an aramid fiber in an amount of from about 1 to about 1.8 phr.

14. The drilling motor of claim 8 , wherein the curable elastomer comprises at least one of nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), fluoroelastomer (FKM), fluoro ethylene/propylene rubbers (FEPM), or perfluoroelastomers (FFKM).

15. The drilling motor of claim 14 , wherein the curable elastomer comprises at least one of NBR or HNBR and has a Mooney Viscosity (ML(1+4) at 121° C.) in a range from about 20 to about 120.

16. A drilling assembly comprising:
the positive displacement drilling motor of claim 1 ;
a motor output shaft directly or indirectly connected to the rotor; and
a drill bit directly or indirectly connected to the motor output shaft.

Assignees

• Smith International

Inventors

• Meng Scott
• Cariveau Peter Thomas

Classifications

• F05C2253/04

  Composite, e.g. fibre-reinforced · CPC title

• F04C2/1075

  Construction of the stationary member · CPC title

• F04C13/008

  Pumps for submersible use, i.e. down-hole pumping · CPC title

• H02K1/12

  Stationary parts of the magnetic circuit · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title