WO2009142527A1 - Esp présentant un boîtier intégral - Google Patents

Esp présentant un boîtier intégral Download PDF

Info

Publication number
WO2009142527A1
WO2009142527A1 PCT/RU2008/000311 RU2008000311W WO2009142527A1 WO 2009142527 A1 WO2009142527 A1 WO 2009142527A1 RU 2008000311 W RU2008000311 W RU 2008000311W WO 2009142527 A1 WO2009142527 A1 WO 2009142527A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
section
housing
protector
esp
Prior art date
Application number
PCT/RU2008/000311
Other languages
English (en)
Inventor
John Davis
Jacques Orban
Original Assignee
Schlumberger Canada Limited
Services Petroliers Schlumberger
Schlumberger Holdings Limited
Schlumberger Technology B.V.
Prad Research And Development N.V.
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
Application filed by Schlumberger Canada Limited, Services Petroliers Schlumberger, Schlumberger Holdings Limited, Schlumberger Technology B.V., Prad Research And Development N.V. filed Critical Schlumberger Canada Limited
Priority to PCT/RU2008/000311 priority Critical patent/WO2009142527A1/fr
Publication of WO2009142527A1 publication Critical patent/WO2009142527A1/fr

Links

Classifications

    • 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

Definitions

  • This invention relates to electric submersible pumps (ESPs) of the type commonly used to provide artificial lift on oil wells that do not have sufficient pressure to produce to the surface.
  • ESPs electric submersible pumps
  • the invention relates to the housings used in such pumps.
  • FIG 1 shows a known type of ESP.
  • ESP Such devices are well-known in the oil industry and are located downhole in oil wells and operated to pump oil to the surface.
  • the ESP shown in Figure 1 comprises a gauge section 10 with electronics, one or more motor sections 12 (two are shown here), each of which contains a stator and a rotor mounted on a drive shaft; a protector section 14 (comprising four separate housings), a pump intake 16, and a series of pump sections 18 (four are shown here, although the number of sections can be selected according to the amount of lift and volume the pump must deliver).
  • Each section is provided with its own housing which means that there may be as many as 11 housings in a conventional ESP system (four pump housings, two motor housings, one intake housing, and four protector section housings).
  • the pump housing provides containment of the pump stages and bearings and also the reaction force for compression of the pump diffuser stack.
  • the pump intake is typically a separate construction that is fitted between the pump and protector sections of the ESP (there is an existing integral intake pump design in the conventional ESP product line but the protector assembly is still separate from this).
  • Such protector assembly is made up of several protector bodies with internal components attached to them, separated by sections of protector housing, the whole, being made up into a protector assembly in the factory.
  • the pump sections, intake, and protector are field assembled with flange and bolt construction into the completed ESP assembly (along with the motor).
  • a first aspect of this invention provides an electric submersible pump, comprising: a pump section; a pump inlet section; a protector section; and
  • an electric motor section including a power stage and a commutation stage; wherein a common housing is provided which extends over all of the sections of the pump.
  • the common housing comprises a first part enclosing the pump, pump inlet and protector sections; a second part enclosing the power stage of the motor section; and a third part enclosing the commutation stage of the motor section.
  • the pump section typically comprises a diffuser stack that is held in compression by the first housing part.
  • the components of the inlet section and the protector section can also be held in compression by the first housing part.
  • the housing in the region of the pump inlet section typically comprises intake openings covered with a screen.
  • the third housing part (covering the commutation stage) is connected to the second (covering the power stage) by means of a pinned connection. This can ensure accurate rotational alignment.
  • the other sections can be connected by means of threaded connections.
  • a pump as claimed in any preceding claim further comprising a groove in the housing for receiving a power cable.
  • FIG. 1 shows a prior art ESP
  • Figure 2 shows an ESP according to an embodiment of the invention.
  • Figure 3 shows a detailed view of the embodiment of Figure 2. Mode(s) for carrying out the invention
  • FIG. 2 shows an embodiment of an ESP according to the invention.
  • This ESP comprises a single motor section 20, a protector section with a crossover and a pump inlet 22 and a single pump section 24.
  • the overall length of the ESP is less than 12m.
  • Figure 3 shows a sectional view of the ESP of Figure 2, comprising (from left to right) the commutator section 20, a motor section 23, a crossover section 21 which is connected at the top of the motor section 23; a protector section connected to the crossover section, and the pump section 24 connected on top of the protector section 22.
  • a single-piece common shaft 26 runs through all of these sections.
  • the motor section 20 comprises a commutation stage 30 at its lower end for controlling the motor located inside a commutation stage housing part 31.
  • the very end of the shaft 26 is provided with a snap ring 32 against which supports the various rotating components of the ESP.
  • the motor power stage includes a housing 34 with a stator 36 fixed to its inner surface.
  • a rotor 38 is mounted on the shaft 26 inside the stator 36.
  • the motor is preferably a high torque DC motor with multiple magnet rotor poles.
  • the shaft leads from the motor section 20, through the crossover section 21 and into the protector section 22 which serves to separate the motor and pump sections all located in a housing part 39.
  • the protector section comprises three pressure compensating bags 40, each with an associated high speed face seal 42.
  • the protector section will also include a pump inlet with inlet openings 43 in the housing 39 covered by a screen and other seals and filters to prevent fluids from entering the motor housing 34.
  • the shaft 26 leads from the protector section into the pump section 24.
  • the pump comprises a continuation of the housing 39 having a series of diffusers 46 fixed thereto.
  • the diffuser stack 46 and internal components of the inlet, protector and crossover are held in compression by the housing 39.
  • Impellers 48, corresponding to the diffusers 46 are mounted on the shaft 26 so as to be positioned adjacent the diffusers and define centrifugal pump elements.
  • a compression nut 50 is provided at the top of the shaft in the pump section. By tightening the compression nut 50, the impellers and other components mounted on the shaft 26 are forced against each other and held in compression against the snap ring 32.
  • the compact ESP construction provided by this invention allows for the reduction in total number of separate housings, from as many as 11 in a conventional ESP system , to three housing sections (pump/intake/protector housing, motor housing, commutator housing). This reduction in number of housings can be facilitated by a number of features of the compact ESP design:
  • the reduced number of housing joints in the overall assembly means a reduction in concentricity error in the assembly from accumulated manufacturing tolerance, fewer opportunities for joint related problems caused by manufacturing defects, lower vibration levels (fewer opportunities for bearing misalignment in joint bodies).
  • the pump diffusers, intake body and protector bodies can all be held in compression with reaction force provided by the combined single housing.
  • the completed assembly can be made in the factory rather than assembled on-site.
  • the functions of the pump intake body (ingress of well fluid to the pump section and screening of well debris) are integrated into the housing of the compact ESP.
  • a large diameter compact ESP e.g. 111mm pump section OD
  • a small common well casing e.g. 120mm ID
  • This relief groove can vary in depth from nothing at the discharge end (top) of the pump section where the pressure differential between inside and outside of the pump is highest to 4mm deep at the pump intake (where differential pressure is lowest) and staying at this depth for the full length of the protector section.
  • the purpose of this relief is to provide additional space inside the 120mm casing ID to allow for the power cable.
  • both housing connections in the pump/intake/protector section and the upper housing connection in the motor section are typically formed from threaded connections.
  • the housing joints at the bottom of the motor and top of the commutator are preferably pinned construction to provide for precise angular alignment between the motor stator and the commutator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Cette invention concerne des pompes électriques submersibles (ESP) du type utilisé couramment pour assurer une ascension artificielle dans des puits de pétrole qui ne développent pas une pression suffisante pour remonter la production à la surface. L’invention concerne également une pompe électrique submersible comprenant une partie pompe, une partie orifice d'aspiration, une partie de protection, et une partie moteur électrique comprenant un étage de puissance et un étage de commutation. Un boîtier intégral recouvre toutes les parties de la pompe.
PCT/RU2008/000311 2008-05-20 2008-05-20 Esp présentant un boîtier intégral WO2009142527A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2008/000311 WO2009142527A1 (fr) 2008-05-20 2008-05-20 Esp présentant un boîtier intégral

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2008/000311 WO2009142527A1 (fr) 2008-05-20 2008-05-20 Esp présentant un boîtier intégral

Publications (1)

Publication Number Publication Date
WO2009142527A1 true WO2009142527A1 (fr) 2009-11-26

Family

ID=41340317

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2008/000311 WO2009142527A1 (fr) 2008-05-20 2008-05-20 Esp présentant un boîtier intégral

Country Status (1)

Country Link
WO (1) WO2009142527A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060250754A1 (en) * 2005-05-03 2006-11-09 Franklin Electric Co., Inc. Pump-motor assembly lead protector and assembly method
RU2300667C2 (ru) * 2003-10-01 2007-06-10 Шлюмбергер Холдингз Лимитед Система для добычи нефти (варианты) и способы формирования движущего узла для погружной насосной системы, предохранения погружного электродвигателя и защиты компонентов электрической погружной насосной системы от накапливаемого газа
RU2310772C1 (ru) * 2006-03-27 2007-11-20 Закрытое Акционерное Общество "Новомет-Пермь" Погружная многосекционная насосная установка

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2300667C2 (ru) * 2003-10-01 2007-06-10 Шлюмбергер Холдингз Лимитед Система для добычи нефти (варианты) и способы формирования движущего узла для погружной насосной системы, предохранения погружного электродвигателя и защиты компонентов электрической погружной насосной системы от накапливаемого газа
US20060250754A1 (en) * 2005-05-03 2006-11-09 Franklin Electric Co., Inc. Pump-motor assembly lead protector and assembly method
RU2310772C1 (ru) * 2006-03-27 2007-11-20 Закрытое Акционерное Общество "Новомет-Пермь" Погружная многосекционная насосная установка

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