EP3797223B1 - Stator element of a progressive cavity pump and progressive cavity pump - Google Patents

Stator element of a progressive cavity pump and progressive cavity pump Download PDF

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Publication number
EP3797223B1
EP3797223B1 EP19730401.7A EP19730401A EP3797223B1 EP 3797223 B1 EP3797223 B1 EP 3797223B1 EP 19730401 A EP19730401 A EP 19730401A EP 3797223 B1 EP3797223 B1 EP 3797223B1
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EP
European Patent Office
Prior art keywords
stator element
relief
stator
cylindrical portion
tube
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EP19730401.7A
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German (de)
French (fr)
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EP3797223A1 (en
Inventor
Pierre Garnier
Eric OGER
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PCM Technologies SAS
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PCM Technologies SAS
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/008—Pumps for submersible use, i.e. down-hole pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/802—Liners

Definitions

  • the present invention lies in the field of progressive cavity pumps used in installations for pumping hydrocarbons or gas in deep wells.
  • Progressive cavity pumps consist of a stator and a helical rotor inserted into the stator.
  • the stator generally consists of an armature tube made from a rigid material, typically metallic or composite.
  • the frame tube is generally cylindrical and has a constant thickness.
  • An elastomer liner is attached to the inside of this frame tube using a glue-type bonding system.
  • This sleeve has a helical longitudinal recess receiving the helical rotor.
  • the helical rotor has one less lobe than the stator so that at the interface between the rotor and the stator sealed cavities are created. The rotation of the rotor in the stator causes the displacement of these cavities and thus makes it possible to pump a fluid.
  • the separation is particularly present at the ends of the reinforcement tubes, at the point where the elastomer liner stops, allowing infiltration of the pumped fluid at the interface between the reinforcement tube and the liner.
  • Such a defect can lead to complete destruction of the pump stator and loss of function when the sleeve is completely or partially separated from the internal wall of the armature tube.
  • the object of the present invention is to provide a stator element having an elastomer liner having greater resistance to forces, and in particular capable of withstanding both orthoradial forces and axial forces.
  • the present invention relates to a stator element and a progressive cavity pump which can be used as a pump or as a drilling motor.
  • the progressive cavity pump 2 according to a first embodiment of the invention comprises a first 4, a second 6 and a third 8 stator elements, two tubular sections 10, 12, two tubular endpieces 14, 16 and a rotor 18 rotatably mounted in the stator elements, the tubular sections and the tubular ends.
  • Each tubular section 10, 12 is fitted between two stator elements 4, 6 and 6, 8 and makes it possible to fix the stator elements to each other and to center them with respect to each other.
  • the tubular ends 14, 16 are fitted to the free ends of the first 4 and the third 8 stator elements. They include a threaded portion 13 allowing the pump 2 to be attached to another pump or to a casing of a pumping installation.
  • the first 4, second 6 and third 8 stator elements are identical. They can be implemented according to a first embodiment illustrated in the figures 2 to 4 or according to a second embodiment illustrated in the figures 5 to 7 .
  • the first stator element 4 according to the first embodiment comprises an armature tube 20 extending along a longitudinal axis AA, and an elastomer liner 26 fixed in the armature tube.
  • the reinforcement tube 20 comprises a deformed central portion 21 and, at each of its ends, a cylindrical portion 23 with a circular base. It has an internal face 22 and an external face 24.
  • the elastomer sleeve 26 has an outer face 40 fixed to the inner face 22 of the frame tube, and an inner face 42 of helical shape having a pitch p1.
  • the central portion 21 of the reinforcement tube 20 has a substantially constant thickness e and is deformed so that it comprises a first relief 28 and a second relief 30.
  • the reliefs 28, 30 can be bumps or depressions . They are for example obtained by knurling the internal face 22 or the external face 24 of the central portion of the reinforcement tube.
  • the first 28 and the second 30 reliefs form, on the inner face of the central portion of the reinforcement tube, attachment elements for the elastomer liner 26. These attachment elements prevent the tearing of the latter.
  • the first relief 28 has the shape of a helical strip having a pitch to the right with respect to the longitudinal axis A-A of the frame tube.
  • the second relief 30 has the shape of a helical strip having a pitch to the left with respect to the longitudinal axis A-A of the frame tube. Due to this helical shape and the fact that the pitches of the helical bands are reversed, the first 28 and the second 30 reliefs prevent the tearing of the elastomer liner regardless of the direction of the forces applied to it.
  • the connection between the inner face 22 of the frame tube and the outer face 40 of the elastomer sleeve is more resistant to the axial and orthoradial forces generated during the rotation of the helical rotor 18.
  • the reliefs 28, 30 are formed by depressions of the outer face 24 of the frame tube. These depressions are referred to as helical grooves 34 below. These helical grooves 34 are in this example made by knurling the outer face 24 of the frame tube. These helical grooves 34 form helical indentations 36 on the inner face 22 of the frame tube.
  • first 28 and the second 30 reliefs are joined in several sections 32.
  • Intermediate zones 38 located between the first relief 28 and the second relief 30 have a concavity opposite to the concavity of the first 28 and second 30 reliefs.
  • the areas 38 form projections on the outer face 24 of the frame tube.
  • these intermediate zones 38 have the shape of a polygon of order 4.
  • the pitch p2 of the helicoid of the first relief 28 is identical to the pitch p1 of the helicoid of the inner face 42 of the elastomer liner.
  • the second and the third stator elements according to the first embodiment are identical to the first stator element and will not be described in detail.
  • the reliefs are constituted by projections which extend towards the outside of the anchoring tube and which form hollows on the side of the internal face of the reinforcement tube 20.
  • the pitch of the helicoid of the first relief 28 and the pitch of the helicoid of the second relief 30 is substantially equal to or greater than the length of the frame tube 20 so that the first relief 28 and the second relief 30 join in a single section 32.
  • the areas 38 positioned between the first band and the second band have the shape of a polygon of order 3.
  • the figures 5 to 7 represent stator elements according to a second embodiment of the invention.
  • the figure 5 represents a first 4 and a second 6 stator element partially assembled to the tubular section 10.
  • the first, second and third stator elements according to the second embodiment of the present invention are similar to the first, second and third stator elements according to the first embodiment except for the existence of two retaining rings 44 fixed in each stator element.
  • the parts of the stator elements according to the second embodiment identical to the parts of the stator elements according to the first embodiment include the same references and will not be described a second time.
  • the retaining rings 44 of the first 4 and of the second 6 stator elements are suitable for delaying the infiltration of the pumped fluid between the armature tube 20 and the elastomer liner 26. It retain the longitudinal ends of the elastomeric liner 26 against the inner face 22 of the frame tube.
  • the retaining rings 44 are secured in each cylindrical portion 23 of the frame tube 20 coaxially with the longitudinal axis A-A.
  • the elastomer liner 26 is shaped by injecting a raw elastomer mixture into the reinforcement tube 20 when the latter is provided with two retaining rings 44.
  • the retaining rings 44 have a U-shaped section capable of enclosing part of the longitudinal end of the elastomer liner 26.
  • the U-shaped radial section of the retaining rings comprises an external axial branch 46, a radial branch central 48 and an internal axial branch 50.
  • the external axial branch 46 is fixed on the internal face 22 of the cylindrical portion 23 of the frame tube.
  • the central radial branch 48 forms an axial stop for the tubular section 10 during the assembly of the first 4 and the second 6 stator elements.
  • An inner face 52 of the inner axial branch 50 comprises protuberances 54 in the shape of a sawtooth suitable for retaining the elastomer of the liner 26.
  • the retaining rings 44 form abutments preventing the axial displacement of the elastomer liner 26 and thus delay its tearing.
  • the tubular section 10 and the second stator element 6 are assembled and fixed together by applying a welding material at the level of the chamfers 56, the tubular section 10 in turn forms an abutment preventing the axial displacement of the retaining ring 44 of the first stator element and of the retaining ring 44 of the second stator element.
  • the third stator element 8 is fixed to the tubular end piece 16 by a weld 57.
  • the tubular end piece 16 has a threaded portion 13 and an opposite portion 58 fitted into the cylindrical portion 23 of the second stator element 6.
  • the retaining ring 44 bears against the tubular end piece 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

La présente invention se situe dans le domaine des pompes à cavités progressives utilisées dans des installations de pompage d'hydrocarbure ou de gaz en puits profond.The present invention lies in the field of progressive cavity pumps used in installations for pumping hydrocarbons or gas in deep wells.

En particulier, la présente invention se rapporte à un élément de stator d'une pompe à cavités progressives et à une pompe à cavités progressives comportant un tel élément de stator ou plusieurs.In particular, the present invention relates to a stator element of a progressive cavity pump and to a progressive cavity pump comprising such a stator element or several.

Les pompes à cavités progressives sont basées sur le principe « Moineau », dit encore « capsulisme Moineau ». Ces pompes peuvent être utilisées en mode pompe (conversion d'énergie mécanique en énergie hydraulique) ou bien en mode « turbine » ou « motrice » (conversion d'énergie hydraulique en énergie mécanique) pour entrainer en rotation le trépan d'un moteur de forage de puits producteurs d'hydrocarbures.Progressive cavity pumps are based on the “Moineau” principle, also known as “Moineau capsulism”. These pumps can be used in pump mode (conversion of mechanical energy into hydraulic energy) or in "turbine" or "motor" mode (conversion of hydraulic energy into mechanical energy) to rotate the drill bit of a drilling of hydrocarbon producing wells.

Les pompes à cavités progressives comprennent un stator et un rotor hélicoïdal inséré dans le stator.Progressive cavity pumps consist of a stator and a helical rotor inserted into the stator.

Le stator est généralement constitué d'un tube d'armature réalisé à partir d'un matériau rigide, typiquement métallique ou composite. Le tube d'armature est généralement cylindrique et présente une épaisseur constante. Un chemisage en élastomère est fixé à l'intérieur de ce tube d'armature à l'aide d'un système d'adhérisation de type colle. Ce chemisage possède un évidemment longitudinal hélicoïdal recevant le rotor hélicoïdal. Le rotor hélicoïdal comporte un lobe de moins que le stator de telle sorte qu'à l'interface entre le rotor et le stator des cavités étanches sont créées. La rotation du rotor dans le stator entraine le déplacement de ces cavités et permet ainsi de pomper un fluide.The stator generally consists of an armature tube made from a rigid material, typically metallic or composite. The frame tube is generally cylindrical and has a constant thickness. An elastomer liner is attached to the inside of this frame tube using a glue-type bonding system. This sleeve has a helical longitudinal recess receiving the helical rotor. The helical rotor has one less lobe than the stator so that at the interface between the rotor and the stator sealed cavities are created. The rotation of the rotor in the stator causes the displacement of these cavities and thus makes it possible to pump a fluid.

Dans des conditions d'utilisation extrêmes telles que par exemple des pressions importantes, de hautes températures, une forte abrasivité du fluide ou une vitesse de rotation importante du rotor, le chemisage en élastomère subit des efforts importants selon les directions axiale et orthoradiale. Sous l'effet combiné de ces différentes contraintes, le système d'adhérisation appliqué entre le tube d'armature et le chemisage peut être endommagé, décollé de la paroi interne du tube d'armature et parfois même détaché voire expulsé du tube d'armature.Under extreme conditions of use such as, for example, high pressures, high temperatures, high abrasiveness of the fluid or high rotational speed of the rotor, the elastomer liner is subjected to high forces in the axial and orthoradial directions. Under the combined effect of these different stresses, the bonding system applied between the reinforcement tube and the lining may be damaged, detached from the wall inside the frame tube and sometimes even detached or even expelled from the frame tube.

Le décollement est particulièrement présent aux extrémités des tubes d'armature, à l'endroit où le chemisage en élastomère s'arrête autorisant une infiltration du fluide pompé à l'interface entre le tube d'armature et le chemisage. Un tel défaut peut entrainer une destruction complète du stator de la pompe et une perte de fonction lorsque le chemisage est totalement ou partiellement désolidarisé de la paroi interne du tube d'armature.The separation is particularly present at the ends of the reinforcement tubes, at the point where the elastomer liner stops, allowing infiltration of the pumped fluid at the interface between the reinforcement tube and the liner. Such a defect can lead to complete destruction of the pump stator and loss of function when the sleeve is completely or partially separated from the internal wall of the armature tube.

Pour pallier à ce problème de décollement, il est connu, notamment par les documents US 2011/0150685 , CA 2762358 , DE 3322095 , de réaliser des rainures axiales ou des saillies axiales sur la paroi interne d'un tube d'armature de forme cylindrique. Le tube d'armature ne présente alors plus une épaisseur constante sur toute sa circonférence. Ces rainures axiales ou ces saillies axiales permettent de résister à des efforts orthoradiaux mais ne permettent pas de résister simultanément aux efforts axiaux.To overcome this problem of detachment, it is known, in particular from the documents US 2011/0150685 , CA 2762358 , DE 3322095 , to make axial grooves or axial projections on the inner wall of a cylindrically-shaped reinforcing tube. The reinforcement tube then no longer has a constant thickness over its entire circumference. These axial grooves or these axial projections make it possible to resist orthoradial forces but do not make it possible to simultaneously resist axial forces.

Le but de la présente invention est de proposer un élément de stator ayant un chemisage en élastomère ayant une plus grande résistance aux efforts, et en particulier capable de résister à la fois aux efforts orthoradiaux et aux efforts axiaux.The object of the present invention is to provide a stator element having an elastomer liner having greater resistance to forces, and in particular capable of withstanding both orthoradial forces and axial forces.

A cet effet, la présente invention a pour objet un élément de stator d'une pompe à cavités progressives, ledit élément de stator comportant :

  • un tube d'armature ayant un axe longitudinal A-A, une face interne et une face externe, et
  • un chemisage en élastomère fixé sur la face interne du tube d'armature,
caractérisé en ce qu'au moins une portion du tube d'armature présente une épaisseur sensiblement constante et en ce que ladite portion du tube d'armature est déformée de manière à ce qu'elle comprenne au moins un premier relief et un deuxième relief, le premier relief présentant la forme d'une bande hélicoïdale ayant un pas à droite par rapport à l'axe longitudinal A-A du tube d'armature, le deuxième relief présentant la forme d'une bande hélicoïdale ayant un pas à gauche par rapport à l'axe longitudinal A-A du tube d'armature, le premier relief et le deuxième relief se joignant en au moins un tronçon.To this end, the subject of the present invention is a stator element of a progressive cavity pump, said stator element comprising:
  • a frame tube having a longitudinal axis AA, an inner face and an outer face, and
  • an elastomer liner attached to the inner face of the frame tube,
characterized in that at least a portion of the frame tube has a substantially constant thickness and in that said portion of the frame tube is deformed so that it comprises at least a first relief and a second relief, the first relief having the shape of a helical band having a pitch to the right with respect to the longitudinal axis AA of the reinforcing tube, the second relief having the shape of a helical band having a step to the left with respect to the longitudinal axis AA of the reinforcement tube, the first relief and the second relief joining in at least one section.

Suivant des modes particuliers de réalisation, l'élément de stator comporte l'une ou plusieurs des caractéristiques suivantes :

  • Le premier relief et le deuxième relief se joignent en plusieurs tronçons, et dans lequel les zones intermédiaires situées entre le premier relief et le deuxième relief présentent une forme d'un polygone au moins d'ordre 3.
  • Le premier relief et le deuxième relief forment des sillons sur la face externe de la portion du tube d'armature.
  • Le chemisage en élastomère présente une face externe fixée à la face interne du tube d'armature et une face interne de forme hélicoïdale ayant un pas. Le pas de la bande hélicoïdale du premier relief est identique au pas de la forme hélicoïdale de la face interne du chemisage en élastomère.
  • Le tube d'armature comporte à chaque extrémité une portion cylindrique. L'élément de stator comporte au moins une bague de retenue axiale fixée sur la portion cylindrique de l'élément de stator, ladite bague de retenue ayant une section radiale de forme générale en U propre à enceindre une partie d'une extrémité longitudinale du chemisage en élastomère.
  • Au moins une face interne d'une branche axiale de la bague de retenue présente des protubérances en forme de dents de scie.
According to particular embodiments, the stator element comprises one or more of the following characteristics:
  • The first relief and the second relief join in several sections, and in which the intermediate zones located between the first relief and the second relief have the shape of a polygon at least of order 3.
  • The first relief and the second relief form grooves on the outer face of the portion of the frame tube.
  • The elastomeric liner has an outer face attached to the inner face of the frame tube and a helically shaped inner face having a pitch. The pitch of the helical strip of the first relief is identical to the pitch of the helical shape of the internal face of the elastomer liner.
  • The frame tube has a cylindrical portion at each end. The stator element comprises at least one axial retaining ring fixed to the cylindrical portion of the stator element, said retaining ring having a generally U-shaped radial section suitable for enclosing part of a longitudinal end of the sleeve in elastomer.
  • At least one internal face of an axial branch of the retaining ring has protrusions in the form of saw teeth.

L'invention a également pour objet une pompe à cavités progressives comportant :

  • un rotor hélicoïdal monté rotatif dans le chemisage en élastomère,
  • au moins un premier et un deuxième éléments de stator conformes aux caractéristiques mentionnées ci-dessus,
  • un tronçon tubulaire emmanché, d'un côté, dans ladite portion cylindrique du premier élément de stator et, de l'autre côté, dans ladite portion cylindrique du deuxième élément de stator, ledit tronçon tubulaire étant en appui, d'un côté, contre la bague de retenue du premier élément de stator et, de l'autre côté, contre la bague de retenue du deuxième élément de stator, ledit tronçon tubulaire formant une butée propre à empêcher le déplacement axial des bagues de retenue.
The invention also relates to a pump with progressive cavities comprising:
  • a helical rotor rotatably mounted in the elastomer sleeve,
  • at least a first and a second stator element conforming to the characteristics mentioned above,
  • a tubular section fitted, on one side, in said cylindrical portion of the first stator element and, on the other side, in said cylindrical portion of the second stator element, said tubular section bearing, on one side, against the retaining ring of the first stator element and, on the other side, against the retaining ring of the second stator element, said section tubular forming a stop capable of preventing the axial displacement of the retaining rings.

Suivant des modes particuliers de réalisation, la pompe à cavités progressives comporte l'une ou plusieurs des caractéristiques suivantes :

  • La pompe comporte en outre un embout tubulaire ayant une portion filetée et une portion opposée emmanchée dans une autre portion cylindrique du deuxième élément de stator, ledit embout tubulaire formant une butée empêchant le déplacement axial de la bague de retenue.
  • La portion cylindrique du premier élément de stator, la portion cylindrique du deuxième élément de stator et le tronçon tubulaire sont fixés par soudage.
  • La portion cylindrique du deuxième élément de stator et l'embout tubulaire sont fixés par soudage.
According to particular embodiments, the progressive cavity pump comprises one or more of the following characteristics:
  • The pump further comprises a tubular endpiece having a threaded portion and an opposite portion fitted into another cylindrical portion of the second stator element, said tubular endpiece forming a stop preventing the axial displacement of the retaining ring.
  • The cylindrical portion of the first stator element, the cylindrical portion of the second stator element and the tubular section are fixed by welding.
  • The cylindrical portion of the second stator element and the tubular end piece are fixed by welding.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux figures sur lesquelles :

  • la figure 1 est une vue éclatée de côté d'une pompe à cavités progressives ;
  • la figure 2 est une vue en coupe longitudinale d'un élément de stator selon un premier mode de réalisation de l'invention ;
  • la figure 3 est une vue en perspective d'une portion d'un tube d'armature de l'élément de stator illustré sur la figure 2 ;
  • la figure 4 est une vue en coupe longitudinale de la portion de tube d'armature illustrée sur la figure 3 ;
  • la figure 5 est une vue en coupe longitudinale d'une partie de deux éléments de stator selon un second mode de réalisation de l'invention, les deux éléments de stator étant partiellement assemblés;
  • la figure 6 est une vue en coupe transversale de l'élément de stator illustré sur la figure 5 selon le plan de coupe VI-VI ; et
  • la figure 7 est une vue en coupe longitudinale d'un assemblage d'une partie d'un élément de stator selon le second mode de réalisation et d'un embout tubulaire.
The invention will be better understood on reading the following description, given solely by way of example and made with reference to the figures in which:
  • the figure 1 is an exploded side view of a progressive cavity pump;
  • the figure 2 is a longitudinal sectional view of a stator element according to a first embodiment of the invention;
  • the figure 3 is a perspective view of a portion of a frame tube of the stator element shown in the picture 2 ;
  • the figure 4 is a longitudinal sectional view of the reinforcing tube portion shown in the picture 3 ;
  • the figure 5 is a longitudinal sectional view of a part of two stator elements according to a second embodiment of the invention, the two stator elements being partially assembled;
  • the figure 6 is a cross-sectional view of the stator element shown in the figure 5 according to section plan VI-VI; and
  • the figure 7 is a view in longitudinal section of an assembly of a part of a stator element according to the second embodiment and of a tubular end piece.

La présente invention concerne un élément de stator et une pompe à cavités progressives pouvant être utilisée comme pompe ou comme moteur de forage.The present invention relates to a stator element and a progressive cavity pump which can be used as a pump or as a drilling motor.

En référence à la figure 1, la pompe à cavités progressives 2 selon un premier mode de réalisation de l'invention comporte un premier 4, un deuxième 6 et un troisième 8 éléments de stator, deux tronçons tubulaires 10, 12, deux embouts tubulaires 14, 16 et un rotor 18 hélicoïdal monté rotatif dans les éléments de stator, les tronçons tubulaires et les embouts tubulaires.With reference to the figure 1 , the progressive cavity pump 2 according to a first embodiment of the invention comprises a first 4, a second 6 and a third 8 stator elements, two tubular sections 10, 12, two tubular endpieces 14, 16 and a rotor 18 rotatably mounted in the stator elements, the tubular sections and the tubular ends.

Chaque tronçon tubulaire 10, 12 est emmanché entre deux éléments de stators 4, 6 et 6, 8 et permet de fixer les éléments de stator les uns aux autres et de les centrer les uns par rapport aux autres. Les embouts tubulaires 14, 16 sont emmanchés aux extrémités libres du premier 4 et du troisième 8 éléments de stator. Ils comprennent une portion filetée 13 permettant la fixation de la pompe 2 à une autre pompe ou à un carter d'une installation de pompage.Each tubular section 10, 12 is fitted between two stator elements 4, 6 and 6, 8 and makes it possible to fix the stator elements to each other and to center them with respect to each other. The tubular ends 14, 16 are fitted to the free ends of the first 4 and the third 8 stator elements. They include a threaded portion 13 allowing the pump 2 to be attached to another pump or to a casing of a pumping installation.

Le premier 4, le deuxième 6 et le troisième 8 éléments de stator sont identiques. Ils peuvent être mis en œuvre selon un premier mode de réalisation illustré sur les figures 2 à 4 ou selon un deuxième mode de réalisation illustré sur les figures 5 à 7.The first 4, second 6 and third 8 stator elements are identical. They can be implemented according to a first embodiment illustrated in the figures 2 to 4 or according to a second embodiment illustrated in the figures 5 to 7 .

En référence à la figure 2 le premier élément de stator 4 selon le premier mode de réalisation comporte un tube d'armature 20 s'étendant le long d'un un axe longitudinal A-A, et un chemisage en élastomère 26 fixé dans le tube d'armature.With reference to the figure 2 the first stator element 4 according to the first embodiment comprises an armature tube 20 extending along a longitudinal axis AA, and an elastomer liner 26 fixed in the armature tube.

Le tube d'armature 20 comprend une portion centrale déformée 21 et, à chacune de ses extrémités, une portion cylindrique 23 de base circulaire. Il présente une face interne 22 et une face externe 24.The reinforcement tube 20 comprises a deformed central portion 21 and, at each of its ends, a cylindrical portion 23 with a circular base. It has an internal face 22 and an external face 24.

Le chemisage en élastomère 26 présente une face externe 40 fixée à la face interne 22 du tube d'armature, et une face interne 42 de forme hélicoïdale ayant un pas p1.The elastomer sleeve 26 has an outer face 40 fixed to the inner face 22 of the frame tube, and an inner face 42 of helical shape having a pitch p1.

En référence aux figures 3 et 4, la portion centrale 21 du tube d'armature 20 présente une épaisseur e sensiblement constante et est déformée de manière à ce qu'elle comprenne un premier relief 28 et un deuxième relief 30. Les reliefs 28, 30 peuvent être des bosses ou des enfoncements. Ils sont par exemple obtenus par moletage de la face interne 22 ou de la face externe 24 de la portion centrale du tube d'armature. Le premier 28 et le deuxième 30 reliefs forment sur la face interne de la portion centrale du tube d'armature des éléments d'accroche pour le chemisage en élastomère 26. Ces éléments d'accroche empêchent l'arrachage de celui-ci.With reference to figures 3 and 4 , the central portion 21 of the reinforcement tube 20 has a substantially constant thickness e and is deformed so that it comprises a first relief 28 and a second relief 30. The reliefs 28, 30 can be bumps or depressions . They are for example obtained by knurling the internal face 22 or the external face 24 of the central portion of the reinforcement tube. The first 28 and the second 30 reliefs form, on the inner face of the central portion of the reinforcement tube, attachment elements for the elastomer liner 26. These attachment elements prevent the tearing of the latter.

En particulier selon la présente invention, le premier relief 28 présente la forme d'une bande hélicoïdale ayant un pas à droite par rapport à l'axe longitudinal A-A du tube d'armature. Le deuxième relief 30 présente la forme d'une bande hélicoïdale ayant un pas à gauche par rapport à l'axe longitudinal A-A du tube d'armature. En raison de cette forme hélicoïdale et du fait que les pas des bandes hélicoïdales sont inversés, le premier 28 et le deuxième 30 reliefs empêchent l'arrachage du chemisage en élastomère quel que soit la direction des efforts appliqués sur celui-ci. Ainsi, la solidarisation entre la face interne 22 du tube d'armature et la face externe 40 du chemisage en élastomère résiste mieux aux efforts axiaux et orthoradiaux générés lors de la rotation du rotor hélicoïdal 18.In particular according to the present invention, the first relief 28 has the shape of a helical strip having a pitch to the right with respect to the longitudinal axis A-A of the frame tube. The second relief 30 has the shape of a helical strip having a pitch to the left with respect to the longitudinal axis A-A of the frame tube. Due to this helical shape and the fact that the pitches of the helical bands are reversed, the first 28 and the second 30 reliefs prevent the tearing of the elastomer liner regardless of the direction of the forces applied to it. Thus, the connection between the inner face 22 of the frame tube and the outer face 40 of the elastomer sleeve is more resistant to the axial and orthoradial forces generated during the rotation of the helical rotor 18.

Selon le mode de réalisation préféré de l'invention illustré sur les figures 3 et 4, les reliefs 28, 30 sont constitués par enfoncements de la face externe 24 du tube d'armature. Ces enfoncements sont appelés sillons hélicoïdaux 34 ci-après. Ces sillons hélicoïdaux 34 sont dans cet exemple réalisés par moletage de la face externe 24 du tube d'armature. Ces sillons hélicoïdaux 34 forment des indentations hélicoïdales 36 sur la face interne 22 du tube d'armature.According to the preferred embodiment of the invention illustrated in the figures 3 and 4 , the reliefs 28, 30 are formed by depressions of the outer face 24 of the frame tube. These depressions are referred to as helical grooves 34 below. These helical grooves 34 are in this example made by knurling the outer face 24 of the frame tube. These helical grooves 34 form helical indentations 36 on the inner face 22 of the frame tube.

Le premier 28 et le deuxième 30 reliefs se joignent en plusieurs tronçons 32. Des zones intermédiaires 38 situées entre le premier relief 28 et le deuxième relief 30 présentent une concavité opposée à la concavité des premier 28 et deuxième 30 reliefs. Ainsi, sur le mode de réalisation illustré sur les figures 3 et 4, les zones 38 forment des saillies sur la face externe 24 du tube d'armature. Selon ce mode de réalisation, ces zones intermédiaires 38 ont la forme d'un polygone d'ordre 4.The first 28 and the second 30 reliefs are joined in several sections 32. Intermediate zones 38 located between the first relief 28 and the second relief 30 have a concavity opposite to the concavity of the first 28 and second 30 reliefs. Thus, in the embodiment illustrated in the figures 3 and 4 , the areas 38 form projections on the outer face 24 of the frame tube. According to this embodiment, these intermediate zones 38 have the shape of a polygon of order 4.

Avantageusement, le pas p2 de l'hélicoïde du premier relief 28 est identique au pas p1 de l'hélicoïde de la face interne 42 du chemisage en élastomère.Advantageously, the pitch p2 of the helicoid of the first relief 28 is identical to the pitch p1 of the helicoid of the inner face 42 of the elastomer liner.

Le deuxième et le troisième éléments de stator selon le premier mode de réalisation sont identiques au premier élément de stator et ne seront pas décrit en détail.The second and the third stator elements according to the first embodiment are identical to the first stator element and will not be described in detail.

En variante, les reliefs sont constitués par des saillies qui s'étendent vers l'extérieur du tube d'ancrage et qui forment des creux du côté de la face interne du tube d'armature 20.As a variant, the reliefs are constituted by projections which extend towards the outside of the anchoring tube and which form hollows on the side of the internal face of the reinforcement tube 20.

En variante, le tube d'armature 20 est déformé de manière à ce qu'il comprenne un nombre de reliefs supérieur à deux.Alternatively, the frame tube 20 is deformed so that it comprises a number of reliefs greater than two.

En variante, le pas de l'hélicoïde du premier relief 28 et le pas de l'hélicoïde du deuxième relief 30 est sensiblement égal ou supérieur à la longueur du tube d'armature 20 de sorte que le premier relief 28 et le deuxième relief 30 se joignent en un unique tronçon 32.Alternatively, the pitch of the helicoid of the first relief 28 and the pitch of the helicoid of the second relief 30 is substantially equal to or greater than the length of the frame tube 20 so that the first relief 28 and the second relief 30 join in a single section 32.

En variante, les zones 38 positionnées entre la première bande et la deuxième bande présentent la forme d'un polygone d'ordre 3.As a variant, the areas 38 positioned between the first band and the second band have the shape of a polygon of order 3.

Les figures 5 à 7 représentent des éléments de stator selon un second mode de réalisation de l'invention. En particulier la figure 5 représente un premier 4 et un deuxième 6 élément de stator partiellement assemblés au tronçon tubulaire 10.The figures 5 to 7 represent stator elements according to a second embodiment of the invention. In particular the figure 5 represents a first 4 and a second 6 stator element partially assembled to the tubular section 10.

Les premier, deuxième et troisième éléments de stator selon le deuxième mode de réalisation de la présente invention sont similaires aux premier, deuxième et troisième éléments de stator selon le premier mode de réalisation à l'exception de l'existence de deux bagues de retenue 44 fixées dans chaque éléments de stator.The first, second and third stator elements according to the second embodiment of the present invention are similar to the first, second and third stator elements according to the first embodiment except for the existence of two retaining rings 44 fixed in each stator element.

Les pièces des éléments de stator selon le deuxième mode de réalisation identiques aux pièces des éléments de stator selon le premier mode de réalisation comportent les mêmes références et ne seront pas décrites une seconde fois.The parts of the stator elements according to the second embodiment identical to the parts of the stator elements according to the first embodiment include the same references and will not be described a second time.

En référence aux figures 5 et 6, les bagues de retenue 44 du premier 4 et du deuxième 6 éléments de stator sont propres à retarder l'infiltration du fluide pompé entre le tube d'armature 20 et le chemisage en élastomère 26. Elle retiennent les extrémités longitudinales du chemisage en élastomère 26 contre la face interne 22 du tube d'armature.With reference to figures 5 and 6 , the retaining rings 44 of the first 4 and of the second 6 stator elements are suitable for delaying the infiltration of the pumped fluid between the armature tube 20 and the elastomer liner 26. It retain the longitudinal ends of the elastomeric liner 26 against the inner face 22 of the frame tube.

Les bagues de retenue 44 sont fixées dans chaque portion cylindrique 23 du tube d'armature 20 coaxialement à l'axe longitudinal A-A. En pratique, le chemisage en élastomère 26 est mis en forme par injection d'un mélange élastomère cru dans le tube d'armature 20 lorsque celui-ci est muni de deux bagues de retenue 44.The retaining rings 44 are secured in each cylindrical portion 23 of the frame tube 20 coaxially with the longitudinal axis A-A. In practice, the elastomer liner 26 is shaped by injecting a raw elastomer mixture into the reinforcement tube 20 when the latter is provided with two retaining rings 44.

Les bagues de retenue 44 présentent une section en forme de U propre à enceindre une partie de l'extrémité longitudinale du chemisage en élastomère 26. La section radiale en forme d'U des bagues de retenue comporte une branche axiale externe 46, une branche radiale centrale 48 et une branche axiale interne 50.The retaining rings 44 have a U-shaped section capable of enclosing part of the longitudinal end of the elastomer liner 26. The U-shaped radial section of the retaining rings comprises an external axial branch 46, a radial branch central 48 and an internal axial branch 50.

La branche axiale externe 46 est fixée sur la face interne 22 de la portion cylindrique 23 du tube d'armature. La branche radiale centrale 48 forme une butée axiale pour le tronçon tubulaire 10 lors de l'assemblage du premier 4 et du deuxième 6 éléments de stator.The external axial branch 46 is fixed on the internal face 22 of the cylindrical portion 23 of the frame tube. The central radial branch 48 forms an axial stop for the tubular section 10 during the assembly of the first 4 and the second 6 stator elements.

Une face intérieure 52 de la branche axiale interne 50 comporte des protubérances 54 en forme de dent de scies propre à retenir l'élastomère du chemisage 26.An inner face 52 of the inner axial branch 50 comprises protuberances 54 in the shape of a sawtooth suitable for retaining the elastomer of the liner 26.

Les bagues de retenue 44 forment des butées empêchant le déplacement axial du chemisage en élastomère 26 et retardent ainsi son arrachement.The retaining rings 44 form abutments preventing the axial displacement of the elastomer liner 26 and thus delay its tearing.

Lorsque le premier élément de stator 4, le tronçon tubulaire 10 et le deuxième élément de stator 6 sont assemblés et fixés ensemble par application d'un matériau de soudage au niveau des chanfreins 56, le tronçon tubulaire 10 forme à son tour une butée empêchant le déplacement axial de la bague de retenue 44 du premier élément de stator et de la bague de retenue 44 du deuxième élément de stator.When the first stator element 4, the tubular section 10 and the second stator element 6 are assembled and fixed together by applying a welding material at the level of the chamfers 56, the tubular section 10 in turn forms an abutment preventing the axial displacement of the retaining ring 44 of the first stator element and of the retaining ring 44 of the second stator element.

En référence à la figure 7, le troisième élément de stator 8 est fixé à l'embout tubulaire 16 par une soudure 57. L'embout tubulaire 16 présente une portion filetée 13 et une portion 58 opposée emmanchée dans la portion cylindrique 23 du deuxième élément de stator 6. Comme visible sur cette figure, la bague de retenue 44 est en appui contre l'embout tubulaire 16. Lorsque l'embout tubulaire 16 est soudé au troisième élément de stator, l'embout tubulaire 16 forme une butée empêchant le déplacement axial de la bague de retenue 44.With reference to the figure 7 , the third stator element 8 is fixed to the tubular end piece 16 by a weld 57. The tubular end piece 16 has a threaded portion 13 and an opposite portion 58 fitted into the cylindrical portion 23 of the second stator element 6. As visible in this figure, the retaining ring 44 bears against the tubular end piece 16. When the tubular end piece 16 is welded to the third stator element, the end piece tubular 16 forms a stop preventing the axial displacement of the retaining ring 44.

Claims (10)

  1. Stator element (4, 6, 8) of a progressive-cavity pump, said stator element (4, 6, 8) including:
    • a framework tube (20) having a longitudinal axis (A-A), an internal face (22) and an external face (24), and
    • an elastomer lining (26) attached to the internal face of the framework tube, characterised in that at least one portion (21) of the framework tube (20) has a substantially constant thickness (e) and in that said portion (21) of the framework tube (20) is deformed so that it comprises at least a first relief (28) and a second relief (30), the first relief (28) having the form of a helical strip having a pitch to the right with respect to the longitudinal axis (A-A) of the framework tube, the second relief (30) having the form of a helical strip having a pitch to the left with respect to the longitudinal axis (A-A) of the framework tube, the first relief (28) and the second relief (30) joining in at least one section (32).
  2. Stator element (4, 6, 8) according to claim 1, wherein the first relief (28) and the second relief (30) join in a plurality of sections (32), and wherein the intermediate zones (38) located between the first relief (28) and the second relief (30) have a form of a polygon at least of the third order.
  3. Stator element (4, 6, 8) according to either one of claims 1 and 2, wherein the first relief (28) and the second relief (30) form furrows (34) on the external face of the portion (21) of the framework tube (20).
  4. Stator element (4, 6, 8) according to any one of claims 1 to 3, wherein the elastomer lining (26) has an external face (40) attached to the internal face (22) of the framework tube (20), and an internal face (42) of helical shape having a pitch (p1), and wherein the pitch (p2) of the helical strip of the first relief (28) is identical to the pitch (p1) of the helical form of the internal face (42) of the elastomer lining.
  5. Stator element (4, 6, 8) according to any one of claims 1 to 4, wherein the framework tube (20) includes a cylindrical portion (23) at each end and wherein said stator element (4, 6, 8) includes at least one axial retaining ring (44) attached to the cylindrical portion (23) of the stator element (4, 6, 8), said retaining ring (44) having a radial section in the general form of a U able to encircle a part of a longitudinal end of the elastomer lining (26).
  6. Stator element (4, 6, 8) according to claim 5, wherein at least an internal face of an axial arm of the retaining ring (44) has protuberances (54) in the form of saw teeth.
  7. Progressive-cavity pump (2) including:
    - a helical rotor (18) mounted rotatably in the elastomer lining (26),
    - at least a first (4) and second (6) stator element in accordance with either one of claims 5 and 6,
    - a tubular section (10) fitted firstly in said cylindrical portion (23) of the first stator element (4) and secondly in said cylindrical portion (23) of the second stator element (6), said tubular section (10) being in abutment firstly against the retaining ring (44) of the first stator element (4) and secondly against the retaining ring (44) of the second stator element (6), said tubular portion (10) forming a stop able to prevent the axial movement of the retaining rings (44).
  8. Progressive-cavity pump (2) according to claim 7, which furthermore includes a tubular end piece (14, 16) having a threaded portion (13) and an opposite portion (58) fitted in another cylindrical portion (23) of the second stator element (6), said tubular end piece (14, 16) forming a stop preventing the axial movement of the retaining ring (44).
  9. Progressive-cavity pump (2) according to either one of claims 7 and 8, wherein the cylindrical portion (23) of the first stator element (4), the cylindrical portion (23) of the second stator element (6) and the tubular section (10) are secured by welding.
  10. Progressive-cavity pump (2) according to either one of claims 8 and 9, wherein the cylindrical portion (23) of the second stator element (8) and the tubular end piece (16) are secured by welding (57).
EP19730401.7A 2018-05-23 2019-05-16 Stator element of a progressive cavity pump and progressive cavity pump Active EP3797223B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1854309A FR3081519B1 (en) 2018-05-23 2018-05-23 STATOR ELEMENT OF A PROGRESSIVE CAVITY PUMP AND PROGRESSIVE CAVITY PUMP
PCT/FR2019/051113 WO2019224457A1 (en) 2018-05-23 2019-05-16 Stator element of a progressive cavity pump and progressive cavity pump

Publications (2)

Publication Number Publication Date
EP3797223A1 EP3797223A1 (en) 2021-03-31
EP3797223B1 true EP3797223B1 (en) 2022-07-20

Family

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Application Number Title Priority Date Filing Date
EP19730401.7A Active EP3797223B1 (en) 2018-05-23 2019-05-16 Stator element of a progressive cavity pump and progressive cavity pump

Country Status (5)

Country Link
US (1) US11326594B2 (en)
EP (1) EP3797223B1 (en)
CA (1) CA3100403A1 (en)
FR (1) FR3081519B1 (en)
WO (1) WO2019224457A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514238A (en) * 1968-09-16 1970-05-26 Black & Decker Mfg Co Cylinder for fluid pump motor and the like and method of making
DE3438379A1 (en) * 1984-10-19 1986-04-24 Kunststofftechnik Rodenberg GmbH & Co KG, 3054 Rodenberg Stator for eccentric spiral pumps
GB2244517B (en) * 1990-05-31 1994-05-04 Mono Pumps Ltd Helical gear pump and stator
DE19804258A1 (en) * 1998-02-04 1999-08-12 Artemis Kautschuk Kunststoff Eccentric screw pump
DE10245497C5 (en) * 2002-09-27 2009-02-19 Wilhelm Kächele GmbH Elastomertechnik Progressive cavity pump with increased temperature range
DE10338632B4 (en) * 2003-08-22 2005-11-03 Wilhelm Kächele GmbH Eccentric screw pump with erosion-resistant rotor
DE102004038477B3 (en) * 2004-08-07 2005-10-06 Netzsch-Mohnopumpen Gmbh Cavity Pump
RU2402693C1 (en) * 2009-03-10 2010-10-27 Открытое акционерное общество "Павловский машзавод" One-screw hydraulic machine
US8523545B2 (en) * 2009-12-21 2013-09-03 Baker Hughes Incorporated Stator to housing lock in a progressing cavity pump
DE102012112044B4 (en) * 2012-05-04 2015-10-08 Netzsch Pumpen & Systeme Gmbh Self-fixing stator housing

Also Published As

Publication number Publication date
EP3797223A1 (en) 2021-03-31
CA3100403A1 (en) 2019-11-28
WO2019224457A1 (en) 2019-11-28
US11326594B2 (en) 2022-05-10
US20210190068A1 (en) 2021-06-24
FR3081519B1 (en) 2020-05-29
FR3081519A1 (en) 2019-11-29

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