EP0097548B1 - Groupe motopompe pour puits de forage et procédé de protection s'y rapportant - Google Patents

Groupe motopompe pour puits de forage et procédé de protection s'y rapportant Download PDF

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Publication number
EP0097548B1
EP0097548B1 EP83401072A EP83401072A EP0097548B1 EP 0097548 B1 EP0097548 B1 EP 0097548B1 EP 83401072 A EP83401072 A EP 83401072A EP 83401072 A EP83401072 A EP 83401072A EP 0097548 B1 EP0097548 B1 EP 0097548B1
Authority
EP
European Patent Office
Prior art keywords
motor
pump
shaft
sealing system
fluid
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.)
Expired
Application number
EP83401072A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0097548A1 (fr
Inventor
Marcel Arnaudeau
Pierre Morin
Jean Fouin
Michel Galais
Christian Sardain
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.)
Moteurs Leroy Somer SA
Original Assignee
Moteurs Leroy Somer SA
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 Moteurs Leroy Somer SA filed Critical Moteurs Leroy Somer SA
Publication of EP0097548A1 publication Critical patent/EP0097548A1/fr
Application granted granted Critical
Publication of EP0097548B1 publication Critical patent/EP0097548B1/fr
Expired legal-status Critical Current

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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

  • the present invention relates to a motor pump unit for a wellbore, in particular used for pumping hydrocarbons, this group being intended to be immersed in an external medium.
  • the invention also relates to a protection method relating to such a group.
  • Known devices of this kind include a motor housed in a sealed enclosure and axially coupled to a pump housed in a cylindrical body and formed by a number of stages.
  • a sealing system generally placed on the outlet of the motor shaft in the vicinity of the coupling with the pump, seals the enclosure of the engine to prevent the penetration into it of the fluid pumped into which the group is immersed in. Indeed, a lack of tightness quickly leads to the destruction of the engine by two joint phenomena.
  • the penetration of solid particles of the sand type causes wear and then seizure of the stops and bearings.
  • the penetration of the pumped fluid which generally comprises an appreciable proportion of water highly charged with salts, causes destruction of the electrical windings.
  • the motor with its sealing system is generally located below the pump.
  • the sealing system generally comprises a rotating mechanical seal, one of the cooperating parts of which is in direct contact with the particles in suspension in the pumped fluid, which are liable to accumulate in the vicinity of the seal and to rapidly cause the deterioration of the cooperating parts.
  • the present invention aims to produce a pump unit in which the rotary mechanical seal is sufficiently protected from damage due to solid particles so that its life is at least of the order of the interval between two routine maintenance operations of the group. .
  • a motor pump unit for wellbore comprising a motor housed in a sealed enclosure and axially coupled to a pump housed in a cylindrical body and formed by a number of stages, a sealing system on the output of the motor shaft, and a sweeping circuit withdrawing pumped fluid from an area of average radius of an intermediate space of the pump, characterized in that the sweeping circuit comprises a channel drilled in the axis of the pump shaft opening into a first annular space formed by the radial clearance of the bearing carrying this shaft closest to the motor, a second annular space located around the trees and externally limited by a chimney integral with the pump body, the pumped fluid circuit also being annular and located outside the chimney, and ejection channels directed towards the outside environment in the vicinity of the sealing system of the motor shaft.
  • This circuit carries out during the operation of the pump set a continuous scanning of the area in the vicinity of the sealing system by means of a clean fluid thanks to the fact that the declutching fluid is taken from an average radius of the pump, the solid particles pumped fluid being removed from the sampling area by centrifugation.
  • the passage through the annular space of a bearing plays an additional protective role by making it possible to stop any particles and the annular part limited by a chimney allows total isolation of the scanning circuit.
  • a protective piece wedged on the shaft located on the side of the pump with respect to the sealing system, and of a larger diameter. to that of said system.
  • this part constitutes, in particular during periods of standstill, a protective cap for the lining by preventing particles from coming to deposit on it.
  • the protective part advantageously comprises a peripheral rim extending up to the internal wall of the enclosure of the motor, in order to improve the effectiveness of the protection.
  • the rim of the protective part provides, with a support part for the seal, an annular space located opposite the ejection channels.
  • a second aspect of the invention relates to a method of protecting the sealing system of a pump unit for wells of drilling, in accordance with the first aspect, by means of a selected part of the pumped liquid taken between two stages of the pump, characterized in that this selected part of the pumped liquid is channeled in the vicinity of the sealing system of the motor as liquid washing, then ejected into the outside environment.
  • the pump unit comprises a motor 1, housed in a sealed enclosure 2 filled with lubricant, and the shaft 3 of which is coupled by means of a sleeve 4 to the shaft of a pump 6.
  • the shaft 3 leaves the enclosure 2 by a rotating mechanical seal 7 ensuring the tightness of the passage and composed of a fixed part 7a fixed on a support part 8 secured to the enclosure 2 and of a rotating part 7b fixed on the shaft and applied to the fixed part 7a by a spring 9.
  • the pump 6 comprises a number of stages 11 in series, each composed of movable vanes 11a keyed onto the shaft 5 and fixed vanes 11b secured to a substantially cylindrical pump body 12 bolted to the enclosure 2.
  • the pump body 12 In the vicinity of its connection to the motor, the pump body 12 has a certain number of peripheral windows 13 which constitute the suction orifices of the pump, through which the pumped fluid penetrates according to the arrows P into the annular space formed between a chimney 22 integral with the pump body 12 and the latter.
  • the shaft 5 is drilled with an axial channel 14 which communicates, to the right of FIG. 1, with a radial channel 15 formed in the shaft 5 and in a ring 16 surrounding this shaft opposite an intermediate space 10 of the pump located between two series of stages.
  • Opposite channel 15 is a channel 17 bent to open in an area of, mean radius of the pump.
  • the shaft 5 In line with each of the bearings 19 located upstream (relative to the pumping direction), the shaft 5 has a radial channel 21 which opens into the radial clearance between the bearing and the corresponding ring.
  • a protective part 24 is wedged on the shaft 3 of the motor by means of a sleeve 25.
  • the part 24, located on the side of the pump with respect to the lining 7, has a diameter greater than that of this lining and it has a peripheral rim 26 which extends to the internal wall of the enclosure 2 of the engine providing a clearance 27 with this wall ( Figure 2).
  • the rim 26 provides, with the part 8 supporting the lining 7, a flat annular space 28 opposite which are provided radial ejection channels 29.
  • the pumped liquid Under the effect of the pressure generated by the pump in the intermediate space 10, passes through the bent channel 17 and through the radial channel 15 to return upstream through the axial channel 14 according to the arrows L.
  • part of this liquid escapes through the corresponding channel 21 towards the radial clearance of the pad to lubricate it, then joins the pumping flow.
  • the liquid which escapes from the radial clearance 19a of this bearing on the engine side is channeled in the annular space 31 located between the shafts and the chimney 22 to reach the clearance 27 between the rim 26 of the part 24 and the enclosure 2, and be ejected through the channels 29 under the effect of the centrifugal force originating from the wall effect of the rim 26.
  • the circuit L of sampled fluid which passes through 27 and 29 opposes the penetration and accumulation of pumped fluid and solid particles, allowing the annular space 33 to remain filled with clean fluid from the engine.
  • the particles inside the pump decant along an opposite path from the arrows P and are therefore found outside the protected space. If certain particles manage to pass inside the chimney 22, they will be ejected as soon as the engine is restarted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP83401072A 1982-06-04 1983-05-27 Groupe motopompe pour puits de forage et procédé de protection s'y rapportant Expired EP0097548B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209745 1982-06-04
FR8209745A FR2528124B1 (fr) 1982-06-04 1982-06-04 Groupe motopompe pour puits de forage et procede de protection s'y rapportant

Publications (2)

Publication Number Publication Date
EP0097548A1 EP0097548A1 (fr) 1984-01-04
EP0097548B1 true EP0097548B1 (fr) 1987-08-19

Family

ID=9274635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401072A Expired EP0097548B1 (fr) 1982-06-04 1983-05-27 Groupe motopompe pour puits de forage et procédé de protection s'y rapportant

Country Status (6)

Country Link
US (1) US4553909A (no)
EP (1) EP0097548B1 (no)
DE (2) DE3373123D1 (no)
ES (1) ES8403575A1 (no)
FR (1) FR2528124B1 (no)
NO (1) NO155019C (no)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5845709A (en) * 1996-01-16 1998-12-08 Baker Hughes Incorporated Recirculating pump for electrical submersible pump system
US5779434A (en) * 1997-02-06 1998-07-14 Baker Hughes Incorporated Pump mounted thrust bearing
US7841395B2 (en) * 2007-12-21 2010-11-30 Baker Hughes Incorporated Electric submersible pump (ESP) with recirculation capability
US8425667B2 (en) * 2010-08-31 2013-04-23 General Electric Company System and method for multiphase pump lubrication
US8721181B2 (en) * 2010-09-29 2014-05-13 Baker Hughes Incorporated Keyless bearing sleeve for subterranean applications
GB201507261D0 (en) 2015-04-28 2015-06-10 Coreteq Ltd Motor and pump parts
JP2020197139A (ja) * 2019-05-31 2020-12-10 三菱重工業株式会社 油田用ポンプ
WO2022176092A1 (ja) * 2021-02-18 2022-08-25 三菱重工業株式会社 原油採掘ポンプ

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778787A (en) * 1927-04-15 1930-10-21 Reda Pump Company Motor protector
US2001172A (en) * 1931-02-21 1935-05-14 Wintroath Pumps Ltd Submersible motor driven pump
US2043236A (en) * 1934-06-01 1936-06-09 David J Conant Submergible motor
US2193903A (en) * 1938-06-18 1940-03-19 Fmc Corp Liquid seal
US2809590A (en) * 1954-01-29 1957-10-15 Robert J Brown Electric motor driven pump
US2783400A (en) * 1955-08-05 1957-02-26 Reda Pump Company Protecting unit for oil-filled submergible electric motors
US3022739A (en) * 1959-07-24 1962-02-27 Fairbanks Morse & Co Motor and pump apparatus
US3288075A (en) * 1964-11-27 1966-11-29 Tait Mfg Co The Pumps
US3850550A (en) * 1971-08-05 1974-11-26 Hydr O Matic Pump Co Centrifugal pump and motor
US3975117A (en) * 1974-09-27 1976-08-17 James Coolidge Carter Pump and motor unit with inducer at one end and centrifugal impeller at opposite end of the motor

Also Published As

Publication number Publication date
DE3373123D1 (en) 1987-09-24
NO831812L (no) 1983-12-05
US4553909A (en) 1985-11-19
NO155019C (no) 1987-01-28
DE97548T1 (de) 1984-04-12
ES522838A0 (es) 1984-03-16
EP0097548A1 (fr) 1984-01-04
FR2528124A1 (fr) 1983-12-09
FR2528124B1 (fr) 1987-04-03
ES8403575A1 (es) 1984-03-16
NO155019B (no) 1986-10-20

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