CA2481135A1 - Motor protector - Google Patents

Motor protector Download PDF

Info

Publication number
CA2481135A1
CA2481135A1 CA 2481135 CA2481135A CA2481135A1 CA 2481135 A1 CA2481135 A1 CA 2481135A1 CA 2481135 CA2481135 CA 2481135 CA 2481135 A CA2481135 A CA 2481135A CA 2481135 A1 CA2481135 A1 CA 2481135A1
Authority
CA
Canada
Prior art keywords
recited
head section
motor protector
abrasives
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2481135
Other languages
French (fr)
Other versions
CA2481135C (en
Inventor
Michael Hui Du
Arthur I. Watson
Arunkumar Arumugam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlumberger Canada Ltd
Original Assignee
Schlumberger Canada Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US10/708,470 external-priority patent/US7182584B2/en
Application filed by Schlumberger Canada Ltd filed Critical Schlumberger Canada Ltd
Publication of CA2481135A1 publication Critical patent/CA2481135A1/en
Application granted granted Critical
Publication of CA2481135C publication Critical patent/CA2481135C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/003—Bearing, sealing, lubricating details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes

Abstract

A system and method is provided for reducing the wear on a motor protector, particularly when used in an abrasive environment. The motor protector comprises an outer housing having an internal shaft. The motor protector further comprises a head section having an abrasives exclusion mechanism to reduce the amount of abrasive material contacting a specific component or components within the motor protector.

Claims (47)

1. A system for use in an electric submersible pumping system, comprising:
a motor protector having an outer housing, an internal shaft, a fluid separation section and a head section, the head section having an abrasives exclusion mechanism to reduce motor protector wear.
2. The system as recited in claim 1, wherein the abrasives exclusion mechanism comprises an upper shaft seal elevated above the floor of the head section.
3. The system as recited in claim 1, wherein the abrasives exclusion mechanism comprises a drainage hole disposed through the outer housing at a lower end of the head section.
4. The system as recited in claim 2, wherein the abrasives exclusion mechanism comprises a stationary shroud deployed over the upper shaft seal.
5. The system as recited in claim 4, further comprising a rotatable shroud attached to the internal shaft proximate the stationary shroud.
6. The system as recited in claim 1, wherein the head section comprises a fluid port disposed through a lower end floor of the head section, and the abrasives exclusion mechanism comprises a stand tube extending upwardly from the fluid port.
7. The system as recited in claim 6, wherein the stand tube comprises a barrier that prevents the entry of abrasives into the stand tube.
8. The system as recited in claim 1, wherein the internal shaft comprises an internal air vent passageway.
9. The system as recited in claim 1, wherein the internal shaft is supported by at least one keyless journal bearing.
10. The system as recited in claim 1, wherein the motor protector further comprises a valve, the valve being inwardly oriented to relieve excessive negative pressure within the motor protector.
11. The system as recited in claim 1, wherein the motor protector further comprises a bag section, the bag section having a fiber-reinforced polymer bag.
12. A pumping system, comprising:
a submersible pump;
a submersible motor to power the submersible pump; and a motor protector fluidically coupled to the submersible motor, the motor protector having a head section with a head section bearing and an abrasives exclusion mechanism to reduce the amount of abrasive material contacting the head section bearing.
13. The system as recited in claim 12, wherein the motor protector is disposed between the submersible pump and the submersible motor.
14. The system as recited in claim 12, wherein the head section bearing comprises a keyless journal bearing.
15. The system as recited in claim 12, wherein the head section comprises an internal chamber into which a drive shaft extends.
16. The system as recited in claim 15, wherein the abrasives exclusion mechanism comprises a shaft seal located about the drive shaft at an elevated position within the internal chamber.
17. The system as recited in claim 14, wherein the abrasives exclusion mechanism comprises a shroud disposed over the shaft seal.
18. The system as recited in claim 15, wherein the abrasives exclusion mechanism comprises a drainage hole disposed through the outer housing at a lower end of the head section.
19. The system as recited in claim 15, wherein the motor protector further comprises a labyrinth section and a bag section.
20. The system as recited in claim 15, wherein the head section comprises a fluid port that extends to a lower motor protector section, the fluid port being coupled to a stand tube extending into the internal chamber.
21. The system as recited in claim 12, wherein the motor protector further comprises a valve, the valve being inwardly oriented to relieve excessive negative pressure within the motor protector.
22. The system as recited in claim 19, wherein the bag section has a fiber-reinforced polymer bag.
23. A method of improving the performance of a motor protector used in abrasive conditions, comprising:

rotatably mounting a shaft through a bearing and a shaft seal positioned within a motor protector housing;
providing a head section into which an upper end of the shaft extends; and protecting the bearing and the shaft seal from contact with sand entering the head section.
24. The method as recited in claim 23, wherein rotatably mounting comprises mounting the shaft in a pair of keyless bearings.
25. The method as recited in claim 23, wherein providing comprises forming a head section chamber within the motor protector housing and above a lower portion of the head section.
26. The method as recited in claim 25, wherein protecting comprises mounting the shaft seal at an elevated position above the lower portion.
27. The method as recited in claim 25, wherein protecting comprises locating a stationary shroud within the head section chamber above the bearing.
28. The method as recited in claim 27, wherein protecting further comprises attaching a rotatable shroud to the shaft proximate the stationary shroud to create a centrifuge effect during operation.
29. The method as recited in claim 25, wherein protecting comprises forming at least one hole through the motor protector housing proximate the lower portion to provide a passageway for dispelling abrasives from the head section chamber.
30. The method as recited in claim 25, further comprising placing a fluid port through the lower portion of the head section to provide fluid communication between the head section chamber and a lower motor protector section.
31. The method as recited in claim 30, further comprising locating a stand tube in the head section chamber and coupling the stand tube to the fluid port.
32. The method as recited in claim 31, further comprising bending the stand tube.
33. The method as recited in claim 31, further comprising placing a filter in the stand tube.
34. The method as recited in claim 31, further comprising creating a tortuous path along the stand tube.
35. The method as recited in claim 31, further comprising placing a cap above the stand tube.
36. The method as recited in claim 23, further comprising venting a gas through the shaft.
37. The method as recited in claim 23, further comprising positioning a relief valve to relieve excessive negative pressure within the motor protector.
38. A pumping system, comprising:
a submersible pump;
a submersible motor to power the submersible pump; and a motor protector fluidically coupled to the submersible motor, the motor protector having a head section with a shaft seal and an abrasives exclusion mechanism to reduce the amount of abrasive material contacting the shaft seal.
39. The system as recited in claim 38, wherein the abrasives exclusion mechanism comprises a head section journal bearing protected by the abrasives exclusion mechanism.
40. The system as recited in claim 38, wherein the abrasives exclusion mechanism comprises a shroud disposed over the shaft seal.
41. The system as recited in claim 38, wherein the abrasives exclusion mechanism comprises a drainage hole disposed through the outer housing at a lower end of the head section.
42. The system as recited in claim 38, wherein the head section comprises a fluid port that extends to a lower motor protector section, the fluid port being coupled to a stand tube extending into the internal chamber.
43. The system as recited in claim 38, wherein the motor protector further comprises a valve, the valve being inwardly oriented to relieve excessive negative pressure within the motor protector.
44. A system for improving the performance of a motor protector used in abrasive conditions, comprising:
means for rotatably mounting a shaft in a bearing positioned within a motor protector housing;
means for providing a head section chamber into which a shaft extends;
and means for protecting the bearing by which the shaft is rotatably supported.
45. The system as recited in claim 44, wherein the means for rotatably mounting comprises a keyless journal bearing.
46. The system as recited in claim 44, wherein the means for providing comprises a head section formed within an outer motor protector housing.
47. The system as recited in claim 44, wherein the means for protecting comprises a sand diverter mechanism to prevent sand from contacting the bearing.
CA 2481135 2003-09-17 2004-09-10 Motor protector Expired - Fee Related CA2481135C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US50378503P 2003-09-17 2003-09-17
US60/503,785 2003-09-17
US10/708,470 US7182584B2 (en) 2003-09-17 2004-03-05 Motor protector
US10/708,470 2004-03-05

Publications (2)

Publication Number Publication Date
CA2481135A1 true CA2481135A1 (en) 2005-03-17
CA2481135C CA2481135C (en) 2012-02-21

Family

ID=34381086

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2481135 Expired - Fee Related CA2481135C (en) 2003-09-17 2004-09-10 Motor protector

Country Status (1)

Country Link
CA (1) CA2481135C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3358130A1 (en) * 2017-02-01 2018-08-08 General Electric Company Motor protector of an electric submersible pump and an associated method thereof
CN113464411A (en) * 2021-08-16 2021-10-01 东营市鑫吉石油技术有限公司 Downhole electric plunger pump system and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3358130A1 (en) * 2017-02-01 2018-08-08 General Electric Company Motor protector of an electric submersible pump and an associated method thereof
CN113464411A (en) * 2021-08-16 2021-10-01 东营市鑫吉石油技术有限公司 Downhole electric plunger pump system and control method thereof

Also Published As

Publication number Publication date
CA2481135C (en) 2012-02-21

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20180910