EP0097548A1 - Bore-hole pump and method for its protection - Google Patents

Bore-hole pump and method for its protection Download PDF

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Publication number
EP0097548A1
EP0097548A1 EP83401072A EP83401072A EP0097548A1 EP 0097548 A1 EP0097548 A1 EP 0097548A1 EP 83401072 A EP83401072 A EP 83401072A EP 83401072 A EP83401072 A EP 83401072A EP 0097548 A1 EP0097548 A1 EP 0097548A1
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EP
European Patent Office
Prior art keywords
pump
pump unit
shaft
motor
unit according
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
EP83401072A
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German (de)
French (fr)
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EP0097548B1 (en
Inventor
Marcel Arnaudeau
Pierre Morin
Jean Fouin
Michel Galais
Christian Sardain
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Moteurs Leroy Somer SA
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Moteurs Leroy Somer SA
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Publication of EP0097548A1 publication Critical patent/EP0097548A1/en
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Publication of EP0097548B1 publication Critical patent/EP0097548B1/en
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    • 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. .
  • This circuit realizes 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 sweeping fluid is taken from an average radius of the pump, the solid particles of the pumped fluid being removed from the sampling area by centrifugation.
  • the scanning circuit comprises a channel drilled in the axis of the pump shaft and passes through an annular space formed by the radial clearance of the bearing carrying this shaft closest to the motor.
  • the scanning circuit comprises an annular part, 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, so that the scanning circuit is completely isolated from the pumped fluid 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.
  • the method of protecting the seal of a motor pump unit for wellbore is characterized in that a selected part of the pumped liquid is withdrawn from an intermediate space of the pump for bring it back and use it in the vicinity of the engine sealing system as washing liquid, then eject it 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 11la 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 tree in front of an intermediate space 10 of the pump situated between two series of stages.
  • Opposite channel 15 is a channel 17 bent to open in an area of medium 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 coming 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.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

Groupe motopompe pour puits de forage, comprenant un moteur (1) et une pompe (6) à arbres (3,5) coaxiaux. Du liquide pompé est prélevé dans l'étage (10) de la pompe et ramené suivant (L) vers l'amont par un canal (14) de l'arbre (5) pour lubrifier au passage les paliers. La partie s'échappant du dernier palier passe au voisinage de la garniture d'étanchéité (7) et est chassée par des canaux (29) par centrifugation. Application à la protection des garnitures d'étanchéité des groupes motopompe contre les particules solides.Motor pump unit for wellbore, comprising a motor (1) and a pump (6) with coaxial shafts (3,5). Pumped liquid is taken from the stage (10) of the pump and brought back next (L) upstream by a channel (14) of the shaft (5) to lubricate the bearings in passing. The part escaping from the last bearing passes in the vicinity of the seal (7) and is expelled through channels (29) by centrifugation. Application to the protection of the seals of pump units against solid particles.

Description

La présente invention concerne un groupe motopompe pour puits de forage, notamment utilisé pour le pompage d'hydrocarbures, ce groupe étant destiné à être immergé dans un milieu extérieur.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.

L'invention concerne également un procédé de protection relatif à un tel groupe.The invention also relates to a protection method relating to such a group.

Les appareils connus de ce genre comprennent un moteur logé dans une enceinte étanche et couplé axialement à une pompe logée dans un corps cylindrique et formée d'un certain nombre d'étages. Un système d'étanchéité, généralement placé sur la sortie de l'arbre moteur au voisinage de l'accouplement avec la pompe, assure l'étanchéité de l'enceinte du moteur pour empêcher la pénétration, dans celle-ci, du fluide pompé dans lequel le groupe est immergé. En effet, un manque d'étanchéité entraîne rapidement la destruction du moteur par deux phénomènes conjoints. D'une part, la pénétration de particules solides du genre sable provoque l'usure puis le grippage des butées et paliers. D'autre part, la pénétration du fluide pompé, qui comporte généralement une proportion appréciable d'eau fortement chargée en sels, provoque une destruction des enroulements électriques.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. On the one hand, the penetration of solid particles of the sand type causes wear and then seizure of the stops and bearings. On the other hand, the penetration of the pumped fluid, which generally comprises an appreciable proportion of water highly charged with salts, causes destruction of the electrical windings.

Or, le moteur, avec son système d'étanchéité est situé généralement au-dessous de la pompe. Et le système d'étanchéité comporte généralement une garniture mécanique tournante dont une des parties coopérantes est en contact direct avec les particules en suspension dans le fluide pompé, lesquelles sont susceptibles de venir s'accumuler au voisinage de la garniture et d'entraîner rapidement la détérioration des parties coopérantes.However, the motor, with its sealing system is generally located below the pump. And 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.

On a tenté de pallier cet inconvénient par diverses dispositions classiques telles que des joints labyrinthes ou des chambres successives entourant l'arbre, constituées par des garnitures mécaniques successives formant des passages en chicane ménageant entre eux des chambres de décantation pour les particules. Mais on ne fait que déplacer le problème, car ces chambres sont progressivement envahies. De plus, l'efficacité d'une telle décantation suppose une disposition du groupe voisine de la verticale.We have tried to overcome this drawback by various conventional arrangements such as labyrinth seals or successive chambers surrounding the shaft, constituted by successive mechanical seals forming chicane passages providing between them settling chambers for the particles. But we are only moving the problem, because these rooms are gradually invaded. In addition, the effectiveness of such decantation supposes an arrangement of the group close to the vertical.

La présente invention vise à réaliser un groupe motopompe dans lequel la garniture mécanique tournante soit suffisamment préservée des dommages dus aux particules solides pour que sa durée de vie soit au moins de l'ordre de l'intervalle entre deux opérations d'entretien courant du groupe.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. .

Ce résultat est atteint, conformément à l'invention au moyen d'un circuit de balayage reliant une zone de rayon moyen d'un étage intermédiaire de la pompe à des canaux d'éjection vers le milieu extérieur, ce circuit passant au voisinage du système d'étanchéité.This result is achieved, in accordance with the invention by means of a scanning circuit connecting an area of average radius of an intermediate stage of the pump to ejection channels to the outside environment, this circuit passing in the vicinity of the system. sealing.

Ce circuit réalise pendant le fonctionnement du groupe motopompe un balayage continu de la zone au voisinage du système d'étanchéité au moyen d'un fluide propre grâce au fait que le fluide balayage est prélevé sur un rayon moyen de la pompe, les particules solides du fluide pompé étant éliminées de la zone de prélèvement par centrifugation.This circuit realizes 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 sweeping fluid is taken from an average radius of the pump, the solid particles of the pumped fluid being removed from the sampling area by centrifugation.

Suivant une réalisation avantageuse de l'invention le circuit de balayage comprend un canal foré dans l'axe de l'arbre de la pompe et passe par un espace annulaire ménagé par le jeu radial du palier portant cet arbre le plus proche du moteur.According to an advantageous embodiment of the invention, the scanning circuit comprises a channel drilled in the axis of the pump shaft and passes through an annular space formed by the radial clearance of the bearing carrying this shaft closest to the motor.

Ce passage à travers cet espace annulaire d'un palier joue un rôle de protection supplémentaire en permettant d'arrêter d'éventuelles particules.This passage through this annular space of a bearing plays an additional protective role by making it possible to stop any particles.

Suivant une réalisation préférée de l'invention, le circuit de balayage comporte une partie annulaire, située autour des arbres et limitée extérieurement par une cheminée solidaire du corps de pompe, le circuit de fluide pompé étant également annulaire et situé à l'extérieur de la cheminée, de sorte que le circuit de balayage est totalement isolé du circuit du fluide pompé.According to a preferred embodiment of the invention, the scanning circuit comprises an annular part, 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, so that the scanning circuit is completely isolated from the pumped fluid circuit.

Suivant une réalisation perfectionnée de l'invention, il est prévu à l'intérieur de la cheminée, une pièce de protection calée sur l'arbre, située du côté de la pompe par rapport au système d'étanchéité, et d'un diamètre supérieur à celui dudit système.According to an improved embodiment of the invention, there is provided inside the chimney, 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.

Dans le cas d'une disposition du groupe voisine de la verticale, cette pièce constitue, notamment pendant les périodes d'arrêt, un chapeau protecteur de la garniture en empêchant les particules de venir se déposer sur elle.In the case of an arrangement of the group close to the vertical, this part constitutes, in particular during periods of standstill, a protective cap for the lining by preventing particles from coming to deposit on it.

La pièce de protection comporte avantageusement un rebord périphérique s'étendant jusqu'à la paroi interne de l'enceinte du moteur, pour améliorer l'efficacité de la protection.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.

D'autre part, le rebord de la pièce de protection ménage, avec une pièce support de la garniture d'étanchéité, un espace annulaire situé en face des canaux d'éjection.On the other hand, the rim of the protective part provides, with a support part for the seal, an annular space located opposite the ejection channels.

Il se produit dans cet espace un effet centrifuge de chasse sur le fluide de balayage.In this space, a centrifugal flushing effect occurs on the sweeping fluid.

Suivant un second aspect de l'invention, le procédé de protection de la garniture d'étanchéité d'un groupe motopompe pour puits de forage est caractérisé en ce qu'on prélève une partie sélectionnée du liquide pompé dans un espace intermédiaire de la pompe pour le ramener et l'utiliser au voisinage du système d'étanchéité du moteur comme liquide de lavage, puis l'éjecter dans le milieu extérieur.According to a second aspect of the invention, the method of protecting the seal of a motor pump unit for wellbore is characterized in that a selected part of the pumped liquid is withdrawn from an intermediate space of the pump for bring it back and use it in the vicinity of the engine sealing system as washing liquid, then eject it into the outside environment.

D'autres particularités et avantages de l'invention ressortiront encore de la description détaillée qui va suivre.Other features and advantages of the invention will emerge from the detailed description who will follow.

Aux dessins annexés, donnés à titre d'exemple non limitatif:

  • . la figure 1 est une vue partielle en coupe longitudinale, d'un groupe motopompe conforme à l'invention;
  • . la figure 2 est une vue agrandie d'une partie de la figure 1, montrant les canaux d'éjection;
  • . la figure 3 est une vue agrandie d'une partie de la figure 1, montrant le palier traversé par le circuit.
In the accompanying drawings, given by way of nonlimiting example:
  • . Figure 1 is a partial view in longitudinal section of a motor pump unit according to the invention;
  • . Figure 2 is an enlarged view of part of Figure 1 showing the ejection channels;
  • . Figure 3 is an enlarged view of part of Figure 1, showing the bearing through which the circuit.

En référence à la figure 1, le groupe motopompe comprend un moteur 1, logé dans une enceinte étanche 2 remplie de lubrifiant, et dont l'arbre 3 est accouplé au moyen d'un manchon 4 à l'arbre d'une pompe 6.With reference to FIG. 1, 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.

L'arbre 3 sort de l'enceinte 2 par une garniture mécanique tournante 7 assurant l'étanchéité du passage et composée d'une partie fixe 7a fixée sur une pièce support 8 solidaire de l'enceinte 2 et d'une partie tournante 7b fixée sur l'arbre et appliquée sur la partie fixe 7a par un ressort 9.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.

La pompe 6 comprend un certain nombre d'étages 11 en série, composés chacun d'aubages mobiles lla clavetés sur l'arbre 5 et d'aubages fixes llb solidaires d'un corps de pompe 12 sensiblement cylindrique boulonné à l'enceinte 2.The pump 6 comprises a number of stages 11 in series, each composed of movable vanes 11la keyed onto the shaft 5 and fixed vanes 11b secured to a substantially cylindrical pump body 12 bolted to the enclosure 2.

Au voisinage de son raccordement au moteur, le corps de pompe 12 comporte un certain nombre de fenêtres périphériques 13 qui constituent les orifices d'aspiration de la pompe, par où le fluide pompé pénètre suivant les flèches P dans l'espace annulaire ménagé entre une cheminée 22 solidaire du corps de pompe 12 et celui-ci.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.

L'arbre 5 est foré d'un canal axial 14 qui communique, vers la droite de la figure 1, avec un canal radial 15 pratiqué dans l'arbre 5 et dans une bague 16 entourant cet arbre en face d'un espace intermédiaire 10 de la pompe situé entre deux séries d'étages. Vis-à-vis du canal 15 est situé un canal 17 coudé pour s'ouvrir dans une zone de rayon moyen de la pompe.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 tree in front of an intermediate space 10 of the pump situated between two series of stages. Opposite channel 15 is a channel 17 bent to open in an area of medium radius of the pump.

Au droit de chacun des coussinets 19 situés en amont (par rapport au sens de pompage), l'arbre 5 présente un canal radial 21 qui débouche dans le jeu radial entre le coussinet et la bague correspondante.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.

Le dernier coussinet 19 vers l'extrémité de l'arbre 5 (mieux visible sur la figure 3) est porté par la cheminée 22 concentrique au corps de pompe 12 et solidaire de ce corps par l'intermédiaire d'un évasement 23 qui s'élargit vers le moteur.The last bearing 19 towards the end of the shaft 5 (better visible in FIG. 3) is carried by the chimney 22 concentric with the pump body 12 and secured to this body by means of a flare 23 which s widens towards the engine.

A la hauteur de cet évasement, une pièce de protection 24 est calée sur l'arbre 3 du moteur par l'intermédiaire d'un manchon 25.At the height of this flare, a protective part 24 is wedged on the shaft 3 of the motor by means of a sleeve 25.

La pièce 24, située du côté de la pompe par rapport à la garniture 7, présente un diamètre supérieur à celui de cette garniture et elle comporte un rebord périphérique 26 qui s'étend jusqu'à la paroi interne de l'enceinte 2 du moteur ménageant un jeu 27 avec cette paroi (figure 2) .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).

Le rebord 26 ménage, avec la pièce 8 support de la garniture 7, un espace annulaire plat 28 en face duquel sont ménagés des canaux radiaux 29 d'éjection.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.

Quand le moteur tourne, le liquide pompé, sous l'effet de la pression engendrée par la pompe dans l'espace intermédiaire 10, passe par le canal coudé 17 et par le canal radial 15 pour retourner vers l'amont par le canal axial 14 suivant les flèches L. Au droit de chaque coussinet 19, une partie de ce liquide s'échappe par le canal 21 correspondant vers le jeu radial du coussinet pour le lubrifier, puis rejoint le flux de pompage.When the engine is running, 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. At the right of each pad 19, 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.

On remarquera que ce liquide prélevé est propre, car il est prélevé sur un rayon moyen du fluide pompé en rotation. Il est donc exempt des particules solides qui sont centrifugées vers la paroi du corps de pompe 12.Note that this liquid collected is clean, because it is taken from an average radius of the fluid pumped in rotation. It is therefore free of solid particles which are centrifuged towards the wall of the pump body 12.

Dans le dernier coussinet 19 situé du côté du moteur, le liquide qui s'échappe du jeu radial 19a de ce coussinet du côté du moteur est canalisé dans l'espace annulaire 31 situé entre les arbres et la cheminée 22 pour atteindre le jeu 27 entre le rebord 26 de la pièce 24 et l'enceinte 2, et être éjecté par les canaux 29 sous l'effet de la force centrifuge provenant de l'effet de paroi du rebord 26.In the last bearing 19 located on the engine side, 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.

Cet effet de chasse par centri fugation s'applique aussi au liquide présent dans les espaces 32 et 28 situés entre le suppart 8 du grain fixe de la garniture 7 et de la pièce de protection 24, ce liquide provenant d'un très faible débit filtrant entre les deux pièces 7a, 7b de la garniture 7.This flushing effect by centri fugation also applies to the liquid present in the spaces 32 and 28 located between the suppart 8 of the fixed grain of the lining 7 and the protective part 24, this liquid coming from a very low filtering flow between the two parts 7a, 7b of the lining 7.

Le circuit L de fluide prélevé, qui passe par 27 et29 s'oppose à la pénétration et à l'accumulation de fluide pompé et de particules solides, permettant à l'espace annulaire 33 de rester rempli de fluide propre provenant du moteur.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 coming from the engine.

Si pour une cause quelconque, une particule provenant du circuit du fluide prélevé pénétrait dans l'espace 28, ou même remontait jusqu'à l'espace 32, elle se trouverait chassée par la force centrifuge.If for any reason, a particle coming from the circuit of the sampled fluid entered the space 28, or even went up to the space 32, it would be driven out by centrifugal force.

A l'arrêt, les particules se trouvant à l'intérieur de la pompe décantent suivant un trajet inverse des flèches P et se retrouvent donc à l'extérieur de l'espace protégé. Si certaines particules parviennent à passer à l'intérieur de la cheminée 22, elles se trouveront éjectées dès la remise en marche du moteur.When stopped, 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.

Bien entendu, l'invention n'est pas limitée à l'exemple décrit mais couvre toute variante technologique accessible à l'homme de l'art.Of course, the invention is not limited to the example described but covers any technological variant accessible to those skilled in the art.

Claims (7)

1. Groupe motopompe pour puits de forage, comprenant un moteur logé dans une enceinte étanche (2) et couplé axialement à une pompe logée dans un corps cylindrique (12) et formée d'un certain nombre d'étages (11), et un système d'étanchéité (7) sur la sortie de l'arbre (3) du moteur, caractérisé en ce qu'il comprend un circuit de balayage (L) reliant une zone de rayon moyen d'un espace intermédiaire (10) de la pompe à des canaux (29) d'éjection vers le milieu extérieur, ce circuit passant au voisinage du système d'étanchéité (7,24).1. Pump unit for wellbore, comprising a motor housed in a sealed enclosure (2) and axially coupled to a pump housed in a cylindrical body (12) and formed of a number of stages (11), and a sealing system (7) on the output of the motor shaft (3), characterized in that it comprises a scanning circuit (L) connecting an area of medium radius to an intermediate space (10) of the pump to channels (29) for ejection to the outside environment, this circuit passing in the vicinity of the sealing system (7,24). 2. Groupe motopompe conforme à la revendication 1, caractérisé en ce que le circuit de balayage (L) comprend un canal (14) foré dans l'axe de l'arbre (5) de la pompe et passe par un espace annulaire (19a) formé par le jeu radial du palier (19) portant cet arbre le plus proche du moteur.2. Pump unit according to claim 1, characterized in that the scanning circuit (L) comprises a channel (14) drilled in the axis of the shaft (5) of the pump and passes through an annular space (19a ) formed by the radial clearance of the bearing (19) carrying this shaft closest to the engine. 3. Groupe motopompe conforme à l'une des revendications 1 ou 2, caractérisé en ce que le circuit de balayage (L) comporte une partie annulaire (31), située autour des arbres (3,5) et limitée extérieurement par une cheminée (22) solidaire du corps de pompe (12), le circuit (P) de fluide pompé étant également annulaire et situé à l'extérieur de la cheminée (22).3. Pump unit according to one of claims 1 or 2, characterized in that the scanning circuit (L) has an annular part (31), located around the shafts (3,5) and externally limited by a chimney ( 22) secured to the pump body (12), the circuit (P) of pumped fluid also being annular and located outside the chimney (22). 4. Groupe motopompe conforme à la revendication 3, caractérisé en ce qu'il comprend, à l'intérieur de la cheminée (22), une pièce de protection (24) calée sur l'arbre (3), située du côté de la pompe par rapport au système d'étanchéité (7), et d'un diamètre supérieur à celui dudit système (7) .4. Pump unit according to claim 3, characterized in that it comprises, inside the chimney (22), a protective part (24) wedged on the shaft (3), located on the side of the pump with respect to the sealing system (7), and of a diameter greater than that of said system (7). 5. Groupe motopompe conforme à la revendication 4, caractérisé en ce que la pièce de protection (24) comporte un rebord périphérique (26) s'étendant jusqu'à la paroi interne de l'enceinte (2) du moteur.5. Pump unit according to claim 4, characterized in that the protective part (24) has a peripheral flange (26) extending to the internal wall of the enclosure (2) of the motor. 6. Groupe motopompe conforme à la revendication 5, caractérisé en ce que le rebord (26) de la pièce de protection (24) ménage, avec une pièce (8) support du système d'étanchéité (7), un espace annulaire plat (28) situé en face des canaux d'éjection (29).6. Pump unit according to claim 5, characterized in that the flange (26) of the protective part (24) household, with a part (8) supporting the sealing system (7), a flat annular space ( 28) located opposite the ejection channels (29). 7. Procédé de protection du système d'étanchéité d'un groupe motopompe pour puits de forage, caractérisé en ce qu'on prélève entre deux étages de la pompe une partie sélectionnée du liquide pompé pour le ramener et l'utiliser au voisinage du système d'étanchéité du moteur comme liquide de lavage, puis l'éjecter dans le milieu extérieur.7. Method for protecting the sealing system of a motor pump unit for a wellbore, characterized in that a selected part of the pumped liquid is taken between two stages of the pump in order to bring it back and use it in the vicinity of the system sealing the engine as a washing liquid, then eject it into the outside environment.
EP83401072A 1982-06-04 1983-05-27 Bore-hole pump and method for its protection Expired EP0097548B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209745 1982-06-04
FR8209745A FR2528124B1 (en) 1982-06-04 1982-06-04 MOTOR PUMP GROUP FOR WELLBORE AND PROTECTIVE METHOD THEREFOR

Publications (2)

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

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401072A Expired EP0097548B1 (en) 1982-06-04 1983-05-27 Bore-hole pump and method for its protection

Country Status (6)

Country Link
US (1) US4553909A (en)
EP (1) EP0097548B1 (en)
DE (2) DE3373123D1 (en)
ES (1) ES522838A0 (en)
FR (1) FR2528124B1 (en)
NO (1) NO155019C (en)

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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 (en) * 2019-05-31 2020-12-10 三菱重工業株式会社 Pump for oil field
WO2022176092A1 (en) * 2021-02-18 2022-08-25 三菱重工業株式会社 Crude oil mining pump

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US1778787A (en) * 1927-04-15 1930-10-21 Reda Pump Company Motor protector
US2193903A (en) * 1938-06-18 1940-03-19 Fmc Corp Liquid seal
US3288075A (en) * 1964-11-27 1966-11-29 Tait Mfg Co The Pumps

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US2043236A (en) * 1934-06-01 1936-06-09 David J Conant Submergible motor
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US1778787A (en) * 1927-04-15 1930-10-21 Reda Pump Company Motor protector
US2193903A (en) * 1938-06-18 1940-03-19 Fmc Corp Liquid seal
US3288075A (en) * 1964-11-27 1966-11-29 Tait Mfg Co The Pumps

Also Published As

Publication number Publication date
DE97548T1 (en) 1984-04-12
US4553909A (en) 1985-11-19
NO831812L (en) 1983-12-05
EP0097548B1 (en) 1987-08-19
FR2528124A1 (en) 1983-12-09
ES8403575A1 (en) 1984-03-16
FR2528124B1 (en) 1987-04-03
NO155019C (en) 1987-01-28
DE3373123D1 (en) 1987-09-24
NO155019B (en) 1986-10-20
ES522838A0 (en) 1984-03-16

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