EP0704599B1 - Installation for oil well equipped with a downhole electrical pump - Google Patents

Installation for oil well equipped with a downhole electrical pump Download PDF

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Publication number
EP0704599B1
EP0704599B1 EP95402176A EP95402176A EP0704599B1 EP 0704599 B1 EP0704599 B1 EP 0704599B1 EP 95402176 A EP95402176 A EP 95402176A EP 95402176 A EP95402176 A EP 95402176A EP 0704599 B1 EP0704599 B1 EP 0704599B1
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EP
European Patent Office
Prior art keywords
well
installation
electric motor
pump
casing
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EP95402176A
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German (de)
French (fr)
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EP0704599A1 (en
Inventor
Jean-Louis Beauquin
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Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
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Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
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    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/128—Adaptation of pump systems with down-hole electric drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth

Definitions

  • the linear motor 34 comprises a stator 40 and a mobile part 42 displaceable according to the effect of the field magnetic generated by the stator.
  • the stator 40 is mounted outside the casing 20 inside of chamber 26.
  • Tubing 20, at least in region 43 adjoining the linear motor 34, is formed of material non-magnetic, which, in a preferred example, is ceramic.
  • the mobile part 42 is provided, at its end upper of a hooking head 44 which allows to go up on the surface, for example by means of a cable, the part mobile 42 as well as pump 30.

Abstract

The installation, which extends from the surface (14) to a petroleum bearing layer (16) at the bottom of the well (10), comprises a tube (20) which forms a channel through which hydrocarbons can flow to the surface, with a seal (24) round the lower end of the tube which forms a chamber (26) isolated from the hydrocarbons. The installation includes a pump (30) and an electric motor (34) to actuate it, with the electric motor stator (40) and cable (38) situated in the chamber (26) surrounding the tube. The tube is made from a non-magnetic material, at least for the portion of its length containing the electric motor, which can be linear or rotary. In addition, the upper end of the motor has a coupling head (44) which allows its mobile section and the pump to be raised to the surface.

Description

La présente invention se rapporte à une installation pour puits pétrolier munie d'une électropompe en fond de puits.The present invention relates to an installation for oil wells equipped with an electric pump at the bottom of well.

Dans certains puits pétroliers, l'écoulement naturel des hydrocarbures du fond à la surface s'avère insuffisant pour permettre ou maintenir une production commerciale. Ceci est dû soit à la viscosité importante des hydrocarbures, soit à une trop faible pression naturelle au fond du puits ou encore à une combinaison des deux. Afin de permettre la mise en production du puits à une échelle commerciale, on peut utiliser un système d'assistance ou système d'activation du puits. Par exemple, on peut disposer une pompe, à l'extrémité inférieure d'un tube de production situé dans le puits. Cette pompe peut être mue par un moteur électrique immergé au fond du puits qui est alimenté par un câble disposé dans l'espace annulaire entre le tubage et le cuvelage du puits.In some oil wells, the natural flow hydrocarbons from the bottom to the surface is insufficient to allow or maintain commercial production. This is due either to the high viscosity of the hydrocarbons, either at too low a natural pressure at the bottom of the well or a combination of the two. In order to allow the putting the well into production on a commercial scale, we can use an assist system or system well activation. For example, we can have a pump, at the lower end of a production tube located in the well. This pump can be driven by a motor electric submerged at the bottom of the well which is supplied by a cable placed in the annular space between the casing and the casing of the well.

Quand on fait un bilan des sources de pannes sur les pompes électriques, ou électropompes, immergées de fond de puits qui nécessitent le retrait d'un tubage, on trouve dans l'ordre :

  • les courts-circuits électriques (environ 80%),
  • l'usure mécanique,
  • la rupture mécanique.
When we take stock of the sources of failures on electric pumps, or electropumps, submerged at the bottom of the well that require the removal of a casing, we find in order:
  • electrical short circuits (around 80%),
  • mechanical wear,
  • mechanical failure.

Certes, certains courts-circuits surviennent dès le premier démarrage et résultent d'une faute lors de l'installation qui demande beaucoup de soin et de savoir-faire.Certainly, some short circuits occur as soon as first start and result from a fault during the installation which requires a lot of care and know-how.

Mais la plupart des courts-circuits ont lieu en cours d'utilisation et résultent d'une dégradation progressive normale des barrières d'isolation électrique, puisque les pompes sont immergées dans l'effluent extrait de la roche pétrolifère.But most short circuits take place in in use and result from degradation normal progressive electrical insulation barriers, since the pumps are immersed in the effluent extracted from petroleum rock.

La gamme de puissance et la profondeur d'installation requièrent des voltages élevés, pouvant atteindre 1000 à 3000 volts pour minimiser les pertes dans les câbles. Mais ces tensions élevées rendent les installations vulnérables.Power range and depth installation require high voltages, which can reach 1000 to 3000 volts to minimize losses in cables. But these high voltages make them vulnerable facilities.

L'altération des isolants solides résulte de phénomènes facilement compréhensibles :

  • L'exploitation du puits engendre nécessairement des variations de pression et de température, dus aux arrêts et aux changements de régimes, dans les zones où se trouvent les équipements de pompage, créant des cycles de sollicitations mécaniques dans les matériaux constitutifs.
  • Les variations de pression provoquent aussi des migrations répétées de gaz au sein des isolants, qui tendent à dégrader leur structure et leur performance.
  • La présence d'hydrocarbures, d'aromatiques, de gaz acides et autres provoque des attaques chimiques diverses sur les différentes barrières d'isolation mécanique ou électrique, contribuant à leur dégradation dans le temps.
  • Les variations de courant électrique (notamment les arrêts et démarrages du moteur) traversant les conducteurs électriques engendrent par effet Joule des variations de température importantes qui accélèrent le vieillissement des isolants électriques.
  • Les voltages élevés évoqués ci-dessus génèrent des champs de sollicitations importants sur tous les isolants.
The deterioration of solid insulation results from easily comprehensible phenomena:
  • The operation of the well necessarily generates variations in pressure and temperature, due to stops and changes in speed, in the areas where the pumping equipment is located, creating cycles of mechanical stresses in the constituent materials.
  • Pressure variations also cause repeated migrations of gases within the insulators, which tend to degrade their structure and performance.
  • The presence of hydrocarbons, aromatics, acid gases and others causes various chemical attacks on the various mechanical or electrical insulation barriers, contributing to their degradation over time.
  • The variations in electric current (in particular the stops and starts of the motor) passing through the electrical conductors generate by Joule effect significant variations in temperature which accelerate the aging of the electrical insulators.
  • The high voltages mentioned above generate significant stress fields on all the insulators.

Le deuxième facteur de coût d'utilisation des électropompes immergées de fond de puits est que pour réparer une panne, il faut remonter tout le câble électrique et le tubage auquel l'unité de fond est accrochée. En effet, les électropompes de fond de puits actuelles constituent des blocs tubulaires compacts assemblés en surface avant leur descente dans le puits. Ces sytèmes doivent, par conséquent, être remontés en totalité avec le tubage en cas de maintenance. Cette intervention nécessite un appareil de service onéreux à mobiliser, notamment sur des sites difficiles d'accès (isolé, en mer, sous-marin, urbain). Le délai d'attente et la durée d'intervention génèrent aussi des manques à produire importants. A tel point que ces systèmes ne peuvent s'envisager dans les cas les plus difficiles.The second cost factor for using downhole submersible electric pumps is only for repair a fault, you must reassemble the entire electric cable and the casing to which the bottom unit is attached. Indeed, current downhole electric pumps are compact tubular blocks assembled on the surface before their descent into the well. These systems should therefore be completely reassembled with the casing in case of maintenance. This intervention requires a expensive service to mobilize, especially on sites difficult to access (isolated, at sea, submarine, urban). The waiting time and response time also generate significant production shortfalls. So much so that these systems cannot be envisaged in the most difficult.

L'ensemble de ces facteurs affecte dramatiquement le coût de ce mode de pompage et interdisent même économiquement le développement de certains champs pétroliers marginaux.All of these factors dramatically affect the cost of this pumping mode and even prohibit economically the development of certain fields marginal tankers.

Une installation de pompage aux tiges consiste en une pompe de fond volumétrique installée dans le tubage dont le piston est animé en translation depuis la surface par l'intermédiaire de tiges en acier ou en fibres de verre. En surface, le mouvement est donné au train de tige par une structure à balancier animé par un moteur électrique rotatif ou bien un vérin hydraulique.A rod pumping installation consists of a volumetric downhole pump installed in the casing, the piston is driven in translation from the surface by through steel or fiberglass rods. In surface, the movement is given to the rod train by a pendulum structure driven by a rotary electric motor or a hydraulic cylinder.

Le poids propre, l'inertie, le frottement et la fatigue mécanique des tiges limitent la capacité et la performance de pompage de ces systèmes. Ils sont peu adaptés aux puits éruptifs sur lesquels des organes de sécurité de fond sont requis, aux puits profonds ou aux débits élevés (supérieures à 200 m3/j de liquide).The dead weight, inertia, friction and mechanical fatigue of the rods limit the pumping capacity and performance of these systems. They are poorly suited to eruptive wells on which bottom safety devices are required, deep wells or high flow rates (greater than 200 m 3 / d of liquid).

Le concept monobloc des électropompes de fond actuelles est intéressant dans le cas de puits où la manoeuvre de manutention est facile et peu onéreuse, cas des puits d'eau potable, des puits non éruptifs à terre ou peu profonds. Il n'est pas adapté aux puits pétroliers actuels et à venir. Ceux-ci sont de plus en plus profonds, inaccessibles, dangereux (car souvent éruptifs), et dotés d'équipements complexes et délicats à mettre en place. Il devient souhaitable de concentrer les faiblesses incontournables comme l'usure mécanique sur un module indépendant qui serait plus léger et moins coûteux à remonter et remplacer, avec un câble ou un treuil par exemple.The one-piece concept of background pumps current is interesting in the case of wells where the handling is easy and inexpensive, in the case of potable water wells, non-eruptive wells on land or little deep. It is not suitable for current oil wells and to come. These are getting deeper and deeper, inaccessible, dangerous (because often eruptive), and endowed complex and delicate equipment to set up. he becomes desirable to focus weaknesses essential as mechanical wear on a module independent which would be lighter and less expensive to reassemble and replace, with a cable or winch by example.

Etant donné que la majorité des causes de panne provient du fait que la partie électrique est immergée dans un milieu hostile, il serait souhaitable de regrouper l'ensemble de la partie électrique dans une enceinte à l'abri de toute agression susceptible d'entraíner des pannes électriques. Ne resteraient en contact avec les effluents que les organes "mécaniques" ne pouvant être la cause ou la proie de courts-circuits électriques, et pouvant être indépendamment remontés et remplacés dans un but de maintenance, suite à une usure mécanique, ou de flexibilité, pour s'adapter par exemple à une évolution des effluents du puits ou des conditions d'exploitation.Since the majority of causes of failure comes from the fact that the electrical part is immersed in a hostile environment, it would be desirable to regroup the entire electrical part in an enclosure safe from any attack likely to cause breakdowns electric. Would not remain in contact with effluents that the "mechanical" organs cannot be the cause or the prey to electrical short circuits, and may be independently reassembled and replaced for the purpose of maintenance, following mechanical wear, or flexibility, to adapt for example to changes in effluents from well or operating conditions.

Le document US-A-4,538,970 décrit une installation pour puits pétrolier correspondant au préambule de la présente revendication 1.
La présente invention a pour objet une installation pour puits pétrolier qui permet de séparer la partie électrique des parties mécaniques d'un groupe électropompe immergé dans le puits, de placer la partie électrique dans une enceinte à l'abri des agressions extérieures provenant notamment des effluents du fond de puits, et de regrouper les parties mécaniques afin de faciliter leur retrait, et de renforcer sa pérennité.Document US-A-4,538,970 describes an installation for an oil well corresponding to the preamble of the present claim 1.
The subject of the present invention is an installation for an oil well which makes it possible to separate the electrical part from the mechanical parts of an electric pump group immersed in the well, to place the electrical part in an enclosure protected from external aggressions originating in particular from effluents. from the bottom of the well, and to group the mechanical parts in order to facilitate their removal, and to reinforce its durability.

Pour répondre à cet objet, l'invention propose une installation pour puits pétrolier s'étendant de la surface vers une couche de roche pétrolifère comprenant un tubage disposé dans le puits et formant une voie d'écoulement vers la surface pour des hydrocarbures provenant de la couche de roche pétrolifère, un cuvelage délimitant la paroi du puits, et un joint disposé en fond de puits entre le tubage et le cuvelage de manière à former une chambre isolée des hydrocarbures, l'installation comprenant de plus, dans le puits, une pompe et un moteur électrique destiné à actionner la pompe, le stator et le câble du moteur électrique étant disposés dans la chambre, à l'extérieur du tubage, caractérisée en ce que la chambre contient une substance diélectrique.To meet this object, the invention proposes a installation for oil well extending from the surface to a layer of petroleum rock comprising casing disposed in the well and forming a flow path to the surface for hydrocarbons from the layer of oil-bearing rock, a casing delimiting the wall of the well, and a seal located at the bottom of the well between the casing and the casing so as to form a chamber isolated from hydrocarbons, the installation further comprising, in the well, a pump and an electric motor for actuating the pump, the stator and the cable of the electric motor being arranged in the chamber, outside the casing, characterized in that the chamber contains a substance dielectric.

Le moteur électrique peut être un moteur rotatif ou linéaire.The electric motor can be a rotary motor or linear.

Selon un mode de réalisation préférée, la pompe est placée en amont du moteur électrique.According to a preferred embodiment, the pump is placed upstream of the electric motor.

La présente invention présente l'avantage de créer une barrière d'étanchéité infranchissable par l'effluent entre la partie mobile centrale et les bobinages du stator. Actuellement dynamique, cette barrière est une technologie plus simple et plus fiable car il s'agit d'une barrière statique de type paroi, qui n'est plus traversée par une partie mobile (arbre ou tige) transmettant le mouvement à la partie mobile de la pompe.The present invention has the advantage of creating an impermeable impermeable sealing barrier between the central movable part and the stator windings. Currently dynamic, this barrier is a technology simpler and more reliable because it is a barrier static wall type, which is no longer crossed by a movable part (shaft or rod) transmitting the movement to the moving part of the pump.

La partie mobile du moteur peut être mise en place et retirée indépendamment de la partie fixe, et en particulier des équipements électriques, et de plus grâce à une intervention légère au câble, ce qui facilite la maintenance mécanique et réduit les coûts d'exploitation.The movable part of the motor can be put in place and removed independently of the fixed part, and particular electrical equipment, and moreover thanks to light intervention on the cable, which facilitates mechanical maintenance and reduces operating costs.

D'autres caractéristiques et avantages de la présente invention ressortiront à la lecture de la description suivante, donnée à titre explicatif mais non limitatif, faite en relation avec les dessins annexés sur lesquels :

  • la figure 1 est une vue en coupe d'une installation pour puits pétrolier selon un premier aspect de l'invention ;
  • la figure 2 est une vue en coupe d'une installation pour puits pétrolier selon un deuxième aspect de l'invention ; et
  • la figure 2A est une vue en coupe, prise selon la ligne A-A de la figure 2.
Other characteristics and advantages of the present invention will emerge on reading the following description, given by way of explanation but not limitation, made in relation to the appended drawings in which:
  • Figure 1 is a sectional view of an installation for an oil well according to a first aspect of the invention;
  • Figure 2 is a sectional view of an installation for an oil well according to a second aspect of the invention; and
  • FIG. 2A is a sectional view, taken along the line AA in FIG. 2.

Sur la figure 1 est représentée, généralement en 10, une installation pour puits pétrolier dans laquelle un puits 12 s'étend entre la surface 14 et une couche de roche pétrolifère 16. Le puits 12 comporte un cuvelage 18 qui rend le puits étanche par rapport aux couches de roches traversées par le puits. A l'intérieur du puits s'étend un tubage de production 20, entre une tête de puits, représentée schématiquement en 22, et un joint 24, plus communément appelé "packer" qui est disposé, par exemple, à environ 100 m au-dessus du niveau de la roche pétrolifère 16. Une chambre 26 étanche est définie entre la paroi extérieure du tubage 20 et la paroi intérieure du cuvelage 18.In Figure 1 is shown, generally at 10, an oil well installation in which a well 12 extends between surface 14 and a layer of rock petroleum 16. The well 12 includes a casing 18 which makes the well tight compared to the layers of rocks crossed by the well. Inside the well extends a production tubing 20, between a well head, shown schematically at 22, and a seal 24, plus commonly called "packer" which is arranged, for example, to about 100 m above the level of the oil rock 16. A sealed chamber 26 is defined between the wall outer casing 20 and the inner wall of the casing 18.

Dans l'exemple illustré, le tubage 20 comporte, à son extrémité inférieure, un ensemble de pompage, représenté généralement en 28 qui comprend une pompe alternative 30 destinée à être actionnée dans le sens de la flèche 32 par un moteur électrique linéaire 34 par l'intermédiaire d'une tige de piston 36. Le moteur électrique linéaire 34 est alimenté à partir de la surface 14 par un câble électrique 38 disposé dans la chambre 26.In the example illustrated, the casing 20 comprises, at its lower end, a pumping assembly, shown generally 28 which includes a 30 reciprocating pump intended to be actuated in the direction of arrow 32 by a linear electric motor 34 via a piston rod 36. The linear electric motor 34 is powered from surface 14 by electrical cable 38 arranged in room 26.

Le moteur linéaire 34 comprend un stator 40 et une partie mobile 42 déplaçable selon l'effet du champ magnétique généré par le stator. Selon l'invention, le stator 40 est monté à l'extérieur du tubage 20 à l'intérieur de la chambre 26. Le tubage 20, au moins dans la région 43 avoisinant le moteur linéaire 34, est formé de matériau amagnétique, qui, dans un exemple préféré, est de la céramique. La partie mobile 42 est munie, à son extrémité supérieure d'une tête d'accrochage 44 qui permet de remonter à la surface, par exemple au moyen d'un câble, la partie mobile 42 ainsi que la pompe 30.The linear motor 34 comprises a stator 40 and a mobile part 42 displaceable according to the effect of the field magnetic generated by the stator. According to the invention, the stator 40 is mounted outside the casing 20 inside of chamber 26. Tubing 20, at least in region 43 adjoining the linear motor 34, is formed of material non-magnetic, which, in a preferred example, is ceramic. The mobile part 42 is provided, at its end upper of a hooking head 44 which allows to go up on the surface, for example by means of a cable, the part mobile 42 as well as pump 30.

Le refroidissement du moteur est assuré par l'effluent extrait qui traverse la partie mécanique du moteur, soit en passant dans l'entrefer entre la partie mobile et le stator immobile, soit au centre de la partie mobile, alors évidée.The engine is cooled by the extracted effluent passing through the mechanical part of the motor, either passing through the air gap between the part mobile and the stator stationary, either in the center of the part mobile, then hollowed out.

La chambre 26 contenant la partie électrique peut, dans un mode de réalisation préférée, recevoir une substance diélectrique, un liquide ou un gel, afin de renforcer encore la pérennité de l'installation. L'utilisation d'un gel présente aussi l'avantage d'isoler thermiquement le tubing, qui reçoit alors toute la chaleur dissipée dans le câble 38 qui le longe et dont il sert de radiateur. Cet échauffement assurera un meilleur rendement énergétique global de l'installation grâce à l'échauffement des écoulements.The chamber 26 containing the electrical part can, in a preferred embodiment, receiving a substance dielectric, liquid or gel, to further strengthen the durability of the installation. The use of a gel also has the advantage of thermally insulating the tubing, which then receives all the heat dissipated in the cable 38 which runs alongside it and which it serves as a radiator. This warm-up ensure better overall energy efficiency of the installation thanks to the heating of the flows.

Comme représenté sur la figure 1, il est préférable de placer la pompe 30 sous le moteur 34, ce qui offre des avantages pour certains types d'effluents visqueux ou gazés au profit des performances du puits. En effet, le fait de placer la pompe sous le moteur réduit nettement les pertes de charge avant l'entrée de l'effluent dans la pompe.As shown in Figure 1, it is best placing the pump 30 under the motor 34, which provides advantages for certain types of viscous or gaseous effluents for the benefit of the performance of the well. Indeed, the fact of placing the pump under the motor significantly reduces losses before the effluent enters the pump.

La lubrification entre les parties mobiles et fixes se fait soit à sec avec des matériaux appropriés (céramique, zirconium, téflon, carbures ou bronze), soit par un film d'effluent mis en place par effet hydrodynamique. Un système parallèle de lubrification pourrait aussi être mis en place.Lubrication between moving and fixed parts is done either dry with suitable materials (ceramic, zirconium, teflon, carbides or bronze), either by a film of effluent set up by hydrodynamic effect. A system parallel lubrication could also be implemented.

L'installation selon l'invention évite la traversée électrique du joint ou "packer" qui était jusqu'à présent inévitable et constituait une source des principales pannes électriques des systèmes utilisés jusqu'alors.The installation according to the invention avoids crossing electric joint or "packer" which was until now inevitable and was a source of the main breakdowns electrical systems previously used.

Un deuxième mode de réalisation est représenté sur la figure 2 dans laquelle les éléments communs à l'installation de la figure 1 portent les mêmes chiffres de référence. Un moteur rotatif, représenté généralement en 46, est relié à une pompe rotative de construction classique, représentée schématiquement en 48, par une tige 50. De manière analogue à l'installation de la figure 1, la partie fixe du moteur rotatif 46, notamment le stator 52, est disposée à l'extérieur du tubage 20, seule la partie mobile se trouve à l'intérieur du tubage dans le milieu corrosif et agressif que constituent les hydrocarbures et les effluents du puits. La partie mobile du moteur rotatif comprend un rotor 54 disposé autour d'un arbre 56 muni d'un passage longitudinal 58. La section 60 du tubage 20 se trouvant entre les bobinages 62 du stator 52 et le rotor 54, est formée d'un matériau amagnétique de sorte à ne pas perturber le champ magnétique qui la traverse.A second embodiment is shown on Figure 2 in which the elements common to the installation of figure 1 carry the same figures of reference. A rotary motor, generally represented at 46, is connected to a rotary pump of conventional construction, represented schematically at 48, by a rod 50. From analogous to the installation of Figure 1, the part of the rotary motor 46, in particular the stator 52, is disposed outside the casing 20, only the movable part is inside the casing in the corrosive medium and aggressive oil and effluents of Wells. The moving part of the rotary motor includes a rotor 54 arranged around a shaft 56 provided with a passage longitudinal 58. The section 60 of the casing 20 being between the windings 62 of the stator 52 and the rotor 54, is formed of non-magnetic material so as not to disturb the magnetic field passing through it.

L'arbre 56 est monté libre en rotation dans le tubage 20 par l'intermédiaire de paliers supérieur 64, central 66 et inférieur 68 à butée axiale. Les paliers 64, 66, 68 sont munis chacun d'un passage radial qui communique avec le passage longitudinal 58 et qui assure la lubrification des paliers. Comme dans le mode de réalisation de la figure 1, la partie mobile du moteur comporte, à son extrémité supérieure, une tête d'accrochage 44 permettant de remonter à la surface la partie mobile du moteur ainsi que la pompe 48. Cette opération s'effectue de manière classique par câble depuis la surface.The shaft 56 is mounted to rotate freely in the casing 20 by means of upper bearings 64, central 66 and lower 68 with axial stop. Bearings 64, 66, 68 are each provided with a radial passage which communicates with the longitudinal passage 58 and which ensures the lubrication of the bearings. As in the embodiment of Figure 1, the movable part of the engine comprises, at its upper end, a hooking head 44 making it possible to bring the moving part of the engine to the surface as well as pump 48. This operation is carried out in a conventional manner by cable from the surface.

Ainsi l'installation selon l'invention permet d'isoler la partie électrique des moteurs des hydrocarbures ou des effluents passant à l'intérieur du tubage 20, hydrocarbures qui constituent un milieu corrosif. Ce type d'installation permet de réduire considérablement le nombre de pannes électriques tout en permettant un remplacement facile des parties mobiles de l'installation.Thus the installation according to the invention allows to isolate the electrical part of the hydrocarbon engines or effluents passing inside the casing 20, hydrocarbons which constitute a corrosive medium. This guy considerably reduces the number of electrical failures while allowing replacement easy moving parts of the installation.

Claims (6)

  1. Oil well installation extending from the surface (14) towards a layer of petroliferous rock (16) and comprising a pipe (20) disposed in the well and forming a flow route towards the surface for the hydrocarbons coming from the layer of petroliferous rock, a casing (18) defining the well wall, and a packer (24) disposed at the bottom of the well between the pipe (20) and the casing (18) so as to form a chamber (26) isolated from the hydrocarbons, the installation further comprising, in the well, a pump (30, 48) and an electric motor (34, 46) for driving the pump, the stator (40, 52) and the cable of the electric motor (38) being disposed in the chamber (26), outside the pipe (20), characterized in that the chamber (26) contains a dielectric substance.
  2. Installation according to Claim 1, characterized in the pipe (20) is formed of non-magnetic material at least in the length where the pipe extends through the electric motor (34, 36).
  3. Installation according to Claim 1 or Claim 2, characterized in that the electric motor is of the linear type (34).
  4. Installation according to Claim 1 or Claim 2, characterized in the electric motor is of the rotary type (46).
  5. Installation according to any one of Claims 1 to 4, characterized in that the pump (30, 48) is disposed upstream of the electric motor (34, 36).
  6. Installation according to any one of Claims 1 to 5, characterized in that the movable portion of the electric motor (34, 36) comprises a coupling head (44) for enabling the said movable portion and the pump (30, 48) to be raised to the surface.
EP95402176A 1994-09-30 1995-09-28 Installation for oil well equipped with a downhole electrical pump Expired - Lifetime EP0704599B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411750A FR2725238B1 (en) 1994-09-30 1994-09-30 INSTALLATION FOR OIL WELLS PROVIDED WITH A DOWNHOLE ELECTRIC PUMP
FR9411750 1994-09-30

Publications (2)

Publication Number Publication Date
EP0704599A1 EP0704599A1 (en) 1996-04-03
EP0704599B1 true EP0704599B1 (en) 1998-05-20

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EP95402176A Expired - Lifetime EP0704599B1 (en) 1994-09-30 1995-09-28 Installation for oil well equipped with a downhole electrical pump

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US (1) US5620048A (en)
EP (1) EP0704599B1 (en)
AT (1) ATE166425T1 (en)
CA (1) CA2159556A1 (en)
DE (1) DE69502563T2 (en)
FR (1) FR2725238B1 (en)
NO (1) NO953864L (en)
OA (1) OA10232A (en)

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Also Published As

Publication number Publication date
US5620048A (en) 1997-04-15
DE69502563D1 (en) 1998-06-25
DE69502563T2 (en) 1999-01-14
CA2159556A1 (en) 1996-03-31
OA10232A (en) 1997-09-19
NO953864L (en) 1996-04-01
NO953864D0 (en) 1995-09-29
EP0704599A1 (en) 1996-04-03
FR2725238A1 (en) 1996-04-05
ATE166425T1 (en) 1998-06-15
FR2725238B1 (en) 1996-11-22

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