EP3108095A1

EP3108095A1 - Pump system for pumping viscous or partially viscous media out of a borehole

Info

Publication number: EP3108095A1
Application number: EP15716403.9A
Authority: EP
Inventors: Klaus Heizinger; Lorenz Lessmann; Eudes Borchardt; Leoncio Del Pozo
Original assignee: Netzsch Pumpen and Systeme GmbH
Current assignee: Netzsch Pumpen and Systeme GmbH
Priority date: 2014-02-19
Filing date: 2015-02-13
Publication date: 2016-12-28
Also published as: US10208576B2; RU2016136993A; CN106062305A; CA2939172A1; BR112016018021A2; BR112016018021B1; AR099497A1; DE102014102126A1; WO2015124135A1; RU2016136993A3; US20160356135A1

Abstract

The invention relates to a pump system and a method for pumping viscous or partially viscous media out of a borehole. The pump system comprises a well pipe (3) which is installed in the borehole and a motor (5) which is coupled to an eccentric screw pump (7), said eccentric screw pump (7) comprising one or more stators (13) and one or more rotors (15, 15') which are received in the stator(s) (13) so as to rotate eccentrically. One or more connection means (20, 25) are also provided, by means of which the eccentric screw pump (7) is fixed in the well pipe (3) in a force-fitting and/or formfitting manner. For the purpose of removing the eccentric screw pump from the borehole, the eccentric screw pump (7) is held by means of the one or more connection means (20, 25) with an axial freedom of movement.

Description

PUMP SYSTEM FOR PROMOTING VISCOS OR PARTIAL VISCOS MEDIA FROM A DRILL

The present invention relates to a pumping system for conveying viscous or partially viscous media from a borehole. In addition, the present invention relates to a method for removing an eccentric screw pump from a wellbore.

Progressing cavity pumps known from the prior art are formed from a rotor and a stator, the rotor being accommodated in the stator and moving eccentrically in the stator. From the movement of the rotor and mutual contact between the stator and rotor moving conveyor chambers are formed, by means of which liquid and / or granular media can be transported along the stator.

For example, progressing cavity pumps are suitable for conveying water, petroleum and a large number of other liquids. To form the delivery chambers and to be able to transport the respective medium with the lowest possible reflux, the rotor is pressurized to an inner wall of the stator formed by elastic material. Such

Eccentric screw pump is known for example from DE 10 2010 037 440 A1.

Such known from the prior art eccentric screw pumps may for example be installed in wells to promote the respective liquid or semi-liquid medium from the wellbore.

If such eccentric screw pumps are installed in a borehole, then the pumps must be held firmly in the borehole due to the axial and radial forces occurring from the respective pumping operation. For this purpose, from the prior art possibilities for solid connection of the respective eccentric screw pump with the borehole or for fixed connection of the respective

Eccentric screw pump with a wellhead arranged in the well known. The possibilities for connection here include radial and axial anchorages for the respective progressing cavity pump. Should an exchange of the respective pump take place or should the respective

Eccentric screw pump for the purpose of maintenance or the like from the Borehole be removed, so this is in known from the prior art embodiments, a complex Deinstallationsprozess necessary in which the anchors must be solved. It would be desirable to have systems in which progressing cavity pumps can be removed from a well in a simplified manner.

The object of the invention is therefore to provide a pump system and a method in which a simple and time-optimized removal of the respective eccentric screw pump can be made from a borehole.

The above object is achieved by a pump system comprising the features in claim 1. Next, the task by a method with the

Characteristics solved in claim 12. Advantageous embodiments are described by the subclaims.

The invention relates to a pumping system for conveying viscous or partially viscous media from a borehole. Such pumping systems as are provided for the present invention may, for example, be suitable for conveying water, petroleum oils and a large number of other liquids. Optionally, a liquid medium may be delivered along with a portion of solids from the wellbore.

According to the invention, a riser pipe or a well pipe is permanently installed in the borehole. If an eccentric screw pump, as described in more detail below, removed from the borehole, so this case is moved relative to the riser or relative to the well pipe. The eccentric screw pump can thus be performed on removal from the wellbore through a riser

or pass a riser.

Further, the pumping system comprises a motor which is connected to a

Eccentric screw pump is coupled. The engine can be usefully installed in the borehole and below the eccentric screw pump. In preferred

Embodiments, the motor is designed as an asynchronous motor. In such embodiments, advantageously, the possibility exists, the respective

To drive eccentric screw pump with a rotation frequency of at least 700 revolutions per minute. The engine is thus in preferred embodiments as

Electric motor formed. In particular, the engine may be brought into operative connection with a pressure compensator. If the eccentric screw pump, as described in more detail below, removed from the well, so the engine can remain in the borehole. The connection between the eccentric screw pump and the motor or the connection between the eccentric screw pump and a drive shaft and / or drive hub of the motor can thus be made detachable. In particular, the connection between the eccentric screw pump and the motor can be detachably formed by an axial movement of the eccentric screw pump.

Also, the connection between the eccentric screw pump and a drive shaft and / or a hub of the engine may be formed such that the

Connection throughout allows axial movement of the eccentric screw pump in the direction of a well opening or that the oriented in the direction of a well opening axial freedom of movement of the eccentric screw pump is not affected by their connection to the engine. At least in the axial direction of the respective eccentric screw pump may not be fixed due to their connection to the engine.

The eccentric screw pump comprises one or more stators and one or more eccentrically rotatably received in the one or more stators rotors. The stators each have a lining, which is brought into abutment with the one or more rotors. If the one or more rotors are moved eccentrically in rotation, delivery chambers are formed between the one or more rotors and the lining, which travel along the eccentric screw pump and move the respective medium via the eccentric screw pump or by means of the moving delivery chambers.

If there are several stators, these are expediently aligned with one another. It is clear to the person skilled in the art that he belongs to

Dependent on the respective desired extension of the eccentric screw pump or the respective depth of the borehole can be provided any number of stators, which are optionally fixed and sealed together. To the eccentric screw fixed in the borehole or firmly in

To position riser, one or more connecting means are provided, via which the eccentric screw pump is positively and / or positively fixed in the riser. In particular, such connecting means are designed to Radial forces resulting from an eccentric movement of the one or more rotors to record.

According to the invention it is provided that the eccentric screw pump is held for the purpose of their removal from the wellbore via the one or more connecting means with axial freedom of movement. The one or more connecting means thus permit axial movement of the eccentric screw pump in the direction of a borehole opening.

Via the one or more connecting means, the eccentric screw pump is not fixed in the axial direction. By a lifting movement or oriented in the direction of the borehole opening pulling movement on the eccentric screw pump thus the eccentric screw pump optionally from the borehole

or be removed from the riser. Since no axial fixation of the eccentric screw pump is provided via the one or more connecting means, an exchange of the respective eccentric screw pump in a simple and straightforward manner and time-optimized.

It makes sense, a movement of the eccentric screw pump in the opposite axial and in the radial direction over the one or more

Connecting means are prevented in fixed in the well pipe eccentric screw pump. For the design of the one or more connecting means are in particular receptacles in which the eccentric screw pump is positively inserted and / or with which the eccentric screw pump is positively connected. The one or more connecting means may at least partially and / or at least partially between the well pipe and the

Be arranged eccentric screw pump. In practice, embodiments have proven in which the

Connecting means comprise at least one housing installed in the well bore with openings or with suction openings for the medium, wherein between the housing and the eccentric screw pump, a fluidic connection is formed. The just described one or more connecting means may at least partially and / or at least partially between the housing and the

Be arranged eccentric screw pump. The housing may be formed of a plurality of each extending along the well pipe parts. For example, a stator of the eccentric screw pump can be positively received by the housing, wherein between the eccentric screw pump

or between the stator of the eccentric screw pump and the housing a fluidly sealed connection is formed. The housing may in this case at least partially extend along the borehole and, if appropriate, be arranged between the eccentric screw pump and the well pipe.

In preferred embodiments, a plurality of openings can be introduced radially and one above the other in the housing in order to ensure sufficient supply of the respective medium to be conveyed via the eccentric screw pump.

For this purpose, one or more sealing elements may optionally be interposed between the stator and the housing. The one or more sealing elements may be formed as part of the eccentric screw pump and are guided out of the borehole together with the eccentric screw pump upon removal of the eccentric screw pump. If there is wear of the one or more sealing elements, then in such preferred embodiments, an extraction of the one or more sealing elements can take place via a removal of the eccentric screw pump.

In particular, embodiments have proven in which the respective stator forms a groove in which the one or more sealing elements are accommodated. The one or more sealing elements preferably extend completely around the outer circumference of the respective stator in order to be able to ensure a sealing connection between the respective stator and the housing.

The respective medium which enters the housing via the openings is thus preferably conveyed completely via the eccentric screw pump received in a form-fitting manner by the housing.

The housing can be permanently installed in the borehole, so that it makes sense no common removal of the housing when removing the eccentric screw pump from the borehole. In particular, it may be that, as described in more detail below, the housing is stationarily connected to the motor.

Also, it may be that the housing communicates with an anti-rotation device, which is a rotating movement of the one or more stators in derogation. As the one or more rotors abut a liner of the one or more stators during their eccentric motion, one moment is transmitted to the one or more stators via the one or more rotors. About the anti-rotation, the moment can be recorded and optionally transmitted to the motor via the housing, so that the one or more stators fixed in operation of the eccentric screw within the mounted at the lower end of the riser housing or receiving housing. A rotation of the stators is thus prevented by the rotation.

It is also conceivable that the housing on the bottom side has one or more openings for dispensing solid constituents of the medium to be delivered. By sedimentation solid components with large mass are not via the

Progressing cavity pump transported, but may optionally settle in the housing, resulting in prolonged operation of the eccentric screw an enrichment in the housing. As a result, openings or suction openings can be closed in the housing, which, if appropriate, an impairment of

Pumping process can go along. Such problems can be avoided with the described embodiment, wherein the respective solid constituents are discharged from the housing via the bottom-side openings.

In various embodiments, it is conceivable that, for example, before removal of the eccentric screw pump from the borehole, a volumetric flow of liquid medium is guided by the eccentric screw pump into the housing, as a result of which solids in the housing pass through the openings and are led out of the housing. For this purpose, the rotor of the eccentric screw pump can be stopped. After stopping the rotor, there is a backflow of liquid medium into the housing, which can be advantageously used to flush the respective solids out of the housing via the openings.

Also via the bottom-side openings, an entry of the respective medium into the housing can take place. Preferably, the bottom-side openings are formed as bores, which include an acute angle together with a longitudinal axis of the well pipe. The bottom-side openings or the bores can thus be oriented inclined in the direction of a borehole bottom.

As previously mentioned, it is conceivable that the housing rotatably in communication with the motor. For example, for this purpose, the housing on the previously described rotation against rotation with the engine in connection. A moment can be passed on from the respective stator to the motor. The engine is preferably installed permanently in the borehole. In practice, it has been shown that the respective motor can easily absorb a moment of the respective stator, without being deoriented and / or damaged.

In preferred embodiments, it is also provided that the housing is installed eccentrically to a longitudinal axis of the well pipe in the borehole and one or more spacer elements are provided which form a groove for receiving a coupled to the motor electrical line connection. The groove may extend at least in sections parallel to the longitudinal axis of the well pipe. Due to the eccentric arrangement, a larger cross-sectional space for the electrical line connection is created, in which free space the electrical

Line connection can be misplaced. For example, the one or more spacer elements can be arranged in sections along the borehole and formed as part of the housing, or protrude from the housing in the direction of the well pipe.

About the one or more spacers, the eccentric screw pump can be kept spaced from the electrical line connection. Further, the electrical line connection between two spacer elements along the

Well pipe be guided. As the eccentric screw pump during its operation and due to an eccentric movement of the one or more rotors

Is exposed to vibrations, such spacers are useful to a

Damage to the electrical wiring can be excluded with certainty. The electrical line connection or the shaft in which the electrical line connection is optionally laid, can along the

Longitudinal direction of the borehole and between the housing and the well pipe extend.

Since, as previously mentioned, the motor and housing can be permanently installed in the wellbore, there is no deinstallation of the electrical

Line connection when removing the eccentric screw pump from the borehole necessary. Via the spacer elements can continue to be guaran teed that no damage to the respective electrical line connection when removing the Eccentric screw pump from the borehole or when inserting a progressing cavity pump in the borehole. The spacer elements preferably remain when removing the eccentric screw pump in the borehole and are not removed together with the eccentric screw pump from the borehole. Further, it may be that the one or more rotors are at their in the direction of

Engine's free end training a gearing and / or with one

Gearing rotatably connected, which engages positively in a rotatably driven via the motor counter teeth. In particular, embodiments have proven in which the one or more rotors are non-rotatably coupled to a preferably flexible shaft which forms a toothing at its pointing in the direction of the motor free end. The toothing may be formed, for example, as internal or external toothing. It is conceivable here that the toothing is designed as a serration. The gearing

or the serration can engage in a corresponding counter-toothing of a hub of the engine.

It may also be that the one or more rotors or the flexible shaft at its pointing in the direction of the motor free end forms an internal toothing, in which engages a drive shaft of the motor with corresponding external toothing. It is clear to the person skilled in the art that he can provide further possibilities for the driving connection between the engine and the one or more rotors, in which case the eccentric screw pump may not be fixed in the axial direction with respect to the engine.

The described formation of a connection between the motor and the one or more rotors via a corresponding toothing with corresponding counter-toothing offers the advantage that an eccentric screw by

Insertion into the borehole can be coupled to the motor and a possible axial freedom of movement of the eccentric screw pump in the borehole is maintained even with trained connection or coupling between the engine and the eccentric screw pump. The progressing cavity pump can thus be taken out of the wellbore simply by lifting, without having to previously solve a connection between the engine and the eccentric screw pump. When inserting an eccentric screw pump into the respective borehole, a connection between the motor and the eccentric screw pump can be easily and optimally made. It is also conceivable that the connecting means comprise one or more elastic centering elements which are arranged along the longitudinal direction of the borehole and at least approximately fix a position of the eccentric screw pump in the well pipe or in the housing. The centering elements can in this case with the eccentric screw pump or with one or more of the stators in

Be brought surface contact and optionally form a circular in cross section recording for the eccentric screw pump. When removing the

Eccentric screw pump, the centering elements can remain in the well pipe or in the housing and not be removed together with the eccentric screw pump from the well.

In particular, embodiments have proven in which the

Centering elements are each received by the previously described housing. It can be provided that the one or more stators of the

Eccentric screw pump with spacers are connected, which extend away from the respective stator in the direction of the respective centering element and space the eccentric screw pump to the respective centering. The

Spacers can be firmly connected to the eccentric screw pump, so that with a removal of the eccentric screw pump from the well a

Removal of the spacer is accompanied. In various embodiments, at least two such spacers, but preferably three or more

Spacers associated with the one or more stators. The

Spacers may optionally protrude radially from the one or more stators.

Because with eccentric motion of the one or more rotors

Vibrations of the eccentric screw pump have come along

Embodiments with such elastic centering proven to prevent larger vibration amplitudes of the eccentric screw pump, or to counteract larger vibration amplitudes of the eccentric screw pump.

As previously mentioned, spacer elements may be formed as part of the housing and / or project from the housing in the direction of the well pipe. It is conceivable here that the spacer elements extend radially away from the housing and in the direction of the well pipe. The spacer elements can in this case be brought into surface contact with the well pipe. As described in more detail below with reference to the method according to the invention, the eccentric screw pump is removed from the borehole by a pulling movement oriented in the direction of a borehole opening. The embodiment with a plurality of centering elements offers the further advantage that over the

Centering a positive guide for the eccentric screw pump can be provided with axial movement, so that the eccentric screw can be introduced via the positive guide defined in the borehole and controlled from the borehole can be removed.

In a pumping operation of the eccentric screw pump act in known from the prior art eccentric screw pumps to the respective

Eccentric screw corresponding axial forces, which are associated with a promotional movement of the respective medium. Since the inventive

Eccentric screw pump is held for the purpose of their removal from the wellbore over the one or more connecting means with axial freedom of movement, in particular embodiments have proven in which the axial forces do not occur or at least largely kept low to an unintentional

To avoid disorientation of the eccentric screw pump in the axial direction.

For this purpose, it may be that the eccentric screw pump has at least one first rotor which is designed to convey the respective medium in the direction of a borehole opening. In addition, the eccentric screw pump may have at least one second rotor, which is non-rotatably connected to the at least one first rotor and designed to convey the respective medium in the direction of a borehole bottom.

The at least one first rotor and the at least one second rotor may meet in a pressure range which is fluidically connected to a channel system for guiding the medium out of the borehole. The medium can thus be guided completely from the pressure area via the channel system from the borehole. The channel system may for this purpose have one or more bypass lines, which may extend through the housing and in the direction of the borehole opening. Since an overpressure is formed in the pressure region due to its connection to the rotors, the medium is optionally from the pressure range and the channel system

or the one or more bypass lines led out of the borehole. In this case, it may be that the at least one first rotor and the at least one second rotor are integrally formed. In further embodiments, the at least one first rotor and the at least one second rotor may be non-rotatably coupled to one another via corresponding connecting means, such as joints, bolt connections or the like.

Since the at least one first rotor effects a delivery of the respective medium in the direction of a borehole opening, first axial forces act on the first rotor, which are oriented in the direction of a borehole bottom. Since the at least one second rotor effects a delivery of the respective medium in the direction of a borehole bottom, second axial forces act on the at least one second rotor, which are oriented opposite to the first axial force in the direction of a borehole opening. In practice, in particular embodiments have proven in which the axial forces cancel at least approximately, so that the eccentric screw pump in the borehole experiences no deorientation or no unwanted movement in the axial direction even with axial freedom of movement.

In order to exclude with certainty an axial movement during operation of the eccentric screw pump, it may be that the pumping system has a stop for the eccentric screw pump, which is arranged above the eccentric screw pump and optionally in the region of a borehole opening. The stop may be formed as part of a Stationsaugstutzens.

It may also be that the at least one second rotor for conveying the respective medium with at least one dedicated suction channel in

Connection is made, along the riser in the direction of

Borlochgrundes extends. The suction channel may be fluidically decoupled from the at least one first rotor. About the own associated suction channel, the medium can be initially sucked via the at least one second rotor in the direction of a well opening, then enter the eccentric screw and then continue on the at least one second rotor in the direction of a borehole bottom. It is also conceivable that the at least one dedicated suction channel is designed as an annular channel guided around the eccentric screw pump at least in regions. The invention further relates to a method for taking a

Progressing cavity pump from a well pipe installed in a borehole. It should be mentioned in advance that features which have been described above for various embodiments of the pumping system according to the invention, as well as various

Embodiments of the method according to the invention can be provided. Also, various features, which hereinafter following embodiments of the

According to the invention be described in various embodiments of the pumping system described above be present.

The eccentric screw pump for the method according to the invention is fixed via one or more connecting means in a riser or in a housing and comprises one or more stators and one or more eccentrically rotatably received in the one or more stators rotors. The one or more connecting means allow continuous axial movement of the

Eccentric screw pump in the direction of a borehole opening. The

Eccentric screw pump is thus not fixed axially via the connecting means in the direction of a borehole opening.

By an oriented in the direction of the borehole opening pulling movement, the eccentric screw pump is lifted from the wellbore in the inventive method. Since the one or more connecting means, which are provided for setting the eccentric screw pump, allow their movement in the axial direction, by means of oriented in the direction of the borehole opening pulling movement the

Eccentric screw pump can be easily and easily removed from the well.

In the context of the inventive method can in preferred

Embodiments also be provided that the eccentric screw pump is coupled to a winch, which winds the pulling movement for lifting the

Progressing cavity pump causes from the borehole. The winch may preferably be brought into operative connection with a drive motor for carrying out a pulling movement.

For example, the eccentric screw pump via rope and / or

Chain links are lifted by the winds. In particular, the

Eccentric screw pump have at its pointing in the direction of the borehole opening end one or more fixing means for the cable and / or chain connection.

For example, at the upper end of the eccentric screw pump a Thread connection may be provided on soft threaded connection or the respective fixing means are screwed.

In addition, it is conceivable that, after removal of the eccentric screw pump, an eccentric screw pump is inserted into the well pipe and, as a result, its free end pointing in the direction of a borehole bottom is positively received by a connecting means designed as a housing.

The eccentric screw pump to be used may be a further eccentric screw pump. It may also be that the eccentric screw pumps arranged in the well pipe are removed from the borehole for the purpose of maintenance and / or repair and, after appropriate maintenance and / or repair, re-inserted into the borehole or into the riser pipe.

As previously mentioned, one or more centering elements may be arranged along the longitudinal direction of the borehole. About the one or more centering can be done on insertion of the eccentric screw pump in the well pipe forced guidance for the positive reception of its free end by the connecting means formed as a housing.

Also can be done via the one or more centering when inserting the eccentric screw in the well pipe forced guidance for coupling the one or more rotors with the engine. In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration. FIG. 1 shows a schematic longitudinal section through an embodiment of a pumping system according to the invention;

Figure 2 shows a detailed view of the longitudinal section in the region A of Figure 1 and a cross section through the embodiment of an inventive

Pumping system in area A; FIG. 3 shows a detailed view of the longitudinal section in region B from FIG. 1 and a cross section through the embodiment of a device according to the invention

Pumping system in area B;

Figure 4 shows a detailed view of the longitudinal section in the region C of Figure 1; FIG. 5 shows a detailed view of the longitudinal section in the region D from FIG. 1;

Figure 6 shows a detailed view of the longitudinal section in the region E of Figure 1;

FIG. 7 shows a detailed view of the longitudinal section in the region F from FIG. 1;

Figure 8 shows a schematic view of an embodiment of a

Eccentric screw pump, as may be provided for the pumping system according to the invention and for implementing the method according to the invention in various embodiments.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments represent only examples of how the pumping system according to the invention or the method according to the invention can be configured and do not represent a final limitation.

FIG. 1 shows a schematic longitudinal section through an embodiment of a pumping system 1 according to the invention. The pumping system 1 is designed for conveying liquids and / or fluid conveying media and / or granular material and for this purpose is inserted into a well pipe 3 of a borehole, which borehole is not shown in FIG is.

Evident is a well pipe 3, which is permanently installed in the respective borehole and designed as a hollow cylinder. Bottom side of the borehole, a motor 5 is provided, which is designed as a submersible motor or as an electric motor and is brought into operative connection with a pressure compensator.

The motor 5 has a take-up hub 27, which from the engine. 5

or by a shaft 59 (see Figure 7) of the motor 5 is rotationally driven, forming an internal toothing and in which a flexible shaft 9 is immersed. The flexible shaft 9 forms at its free and in the direction of the hub 27th pointing end of a serration 21, which engages in the internal toothing of the hub 27, so that the flexible shaft 9 is rotationally driven via the hub 27 and rotationally via the motor 5.

The present connection between serration 21 and internal toothing of the hub 27 allows relative movement of the flexible shaft 9 to the hub 27 along the longitudinal direction of the flexible shaft 9, so that the flexible shaft 9 can be pulled off the hub 27 in the axial direction.

If a flexible shaft 9 with serration 21 is to be coupled to the motor 5, then only the shaft 9 with its serration 21 needs to be axially inserted into the hub 27 for this purpose.

The flexible shaft 9 is rotatably connected to a rotor 15 a

Eccentric screw pump 7 and drives the rotor 15 eccentrically rotating. It is conceivable here that the rotor 15 is formed integrally with the flexible shaft 9. In further embodiments, the rotor 15 can also be fixed in a rotationally fixed manner to the flexible shaft 9 via suitable connecting means.

The rotor 15 is brought into surface contact with a liner 16 of a stator 13 in eccentric rotational movement, resulting from the eccentric movement of the rotor 15 resulting more between the rotor 15 and the liner 16 formed delivery chambers for moving the liquid medium along the

Eccentric screw pump 7 wander.

In order to position the eccentric screw pump 7 in the borehole stable, connecting means 20 and 25 are provided, wherein the connecting means 20 is formed as a housing 8. In its upper area, the housing 8 is coupled to the riser 45. In the region of its end 14 pointing in the direction of a borehole bottom, the stator 13 is received in a form-fitting manner by the connecting means 20 or by the housing 8. The positive connection is in this case designed such that the

Connecting means 20 and the housing 8 radial movements

However, the stator 13 relative to the connecting means 20 and the housing 8 has an axial freedom of movement in the direction of a borehole opening. However, an axial anchoring or positioning of the eccentric screw pump 7 in the direction of a borehole bottom is provided via the housing 8. Over the connecting means 20 or via the housing 8, the eccentric screw pump 7 is thus not axially fixed in the direction of a borehole opening, so that the eccentric screw pump 7 by a in the direction of

Drill hole oriented pull movement can be moved relative to the well pipe 3 and removed from the wellbore. Due to the formed radial positioning and axial positioning in the direction of the borehole bottom of the eccentric screw pump 7, the eccentric screw pump 7 is held substantially immobile during operation via the housing 8.

In addition, an anti-rotation 17 is brought into connection with the eccentric screw pump 7, which prevents a rotating movement of the stator 13. The anti-rotation 17 is part of the connecting means 20 and the housing 8, so that radial forces of the eccentric screw pump 7 of the

Anti-rotation 17 are transmitted to the connecting means 20 and the housing 8. Further, a fixed connection between connecting means 20 or between the housing 8 and the motor 5 is provided, so that the radial forces of the eccentric screw pump 7 are transmitted from the connecting means 20 and from the housing 8 to the motor 5.

The motor 5 is permanently installed in the borehole. In practice, it has been found that the pressure compensator upstream of the motor 5 can easily absorb small radial forces of the eccentric screw pump 7 without being deoriented and / or damaged.

Since the flexible shaft 9 is fixed to the rotor 15 in connection and is not fixed axially on the hub 27, the flexible shaft 9 during lifting of

Eccentric screw pump 7 from the well together with the

Eccentric screw pump 7 out.

The housing 8 comprises in the lower region 6 a plurality of openings 10, via which the respective medium can enter the housing 8. Between the housing 8 and the eccentric screw pump 7 or between the housing 8 and the end 14 of the stator 13, a fluid-sealed connection is made, so that the respective entering through the openings 10 in the housing 8 medium is transported by the eccentric screw pump 7. In this case, the medium passes through a suction region 19. Several such openings 10 are introduced radially into the housing 8 along the circumference of the housing 8. On the bottom side of the housing 8 and in the lower region 6, a plurality of bores 23 are introduced into the housing 8, via which solids can escape from the housing 8 during sedimentation. For this purpose, the bores 23 are each inclined in the direction of a borehole bottom. A blockage of the openings 10 or an accumulation of solids in the housing 8 can be avoided thereby.

As can be seen in Figure 1, the housing 8 is formed of several parts, wherein the lower portion 6 forms a separate part of the housing 8. If a multi-part design of the housing 8 is provided, the plurality of parts can optionally be connected to one another via positive engagement and / or further fixing means. In the areas B, which are shown in detail in Figure 3, in each case a further connecting means 25 for fixing the eccentric screw pump 7 in the well pipe 3 is located. The connecting element 25 is designed as a centering element 55 and receives the eccentric screw pump 7 in a form-fitting manner. Opposite the connecting element 25 and the centering element 55, the eccentric screw pump 7 has an axial freedom of movement, so that a removal of the eccentric screw pump 7 from the borehole by one in the direction of

Well opening oriented pull movement over the connecting element 25th

or via the centering element 55 is not prevented.

In addition, via the centering elements 55, a forced guidance is provided upon insertion of the eccentric screw pump 7 into the borehole, so that the flexible shaft 9 hits the hub 27 of the motor 5 in a targeted manner with its serration 21 formed at the free end. Likewise, the positive guidance provided by the centering elements 55 serves for a controlled and essentially linear removal of the eccentric screw pump 7 from the borehole or from the well pipe 3.

In the region C, which is shown in detail in Figure 4, the pumping system 1 has a pressure region 35. By means of the rotor 15 of the eccentric screw pump 7, the medium is conveyed in the direction of a borehole opening and this first the

Pressure range 35 supplied. About the rotor 15 'of the eccentric screw pump 7, the medium is conveyed in the direction of a borehole bottom and this as well

Pressure range 35 supplied. The rotor 15 'sucks medium for this purpose via the annular channel 1 1, which runs between the well pipe 3 and housing 8, and then transports the medium in the direction of a borehole bottom. The rotors 15 and 15 'are rotatably connected. Due to their different gradients, the medium is transported by the rotors 15 and 15 'in opposite directions.

For this reason, the axial forces of the rotors 15 and 15 'are also in

Counter direction oriented to each other. As indicated by the arrow, the axial forces 30 of the rotors 15 and 15 'thus cancel out completely. In order to seal the pressure region 35, a sealing element 28 (see FIG. 5) is provided below the region C.

In the area A, which is shown in detail in Figure 2, channel connections 24 and bypass lines 26 can be seen, via which, starting from the pressure range 35, the medium is removed from the wellbore. The bypass lines 26 extend through the housing 8 in the direction of a borehole opening.

The Stationsaugstutzen 41 also has an axial rotor stop 37, which has a reduced diameter compared to the stator 13 in cross-section. An axial displacement of the rotors 15 and 15 'of the eccentric screw pump 7 is additionally prevented by means of the rotor stop 37.

Also, a threaded pin 43 is shown, which at the upper end of

Eccentric screw pump 7 protrudes from the eccentric screw pump 7. At the

Threaded pin 43, suitable fixing means can be attached to the

Eccentric screw pump 7 can lift a winch from the hole. Since the eccentric screw pump 7 is not fixed axially via the connecting means 20 and 25 in the direction of a borehole opening, a simple removal of the eccentric screw pump 7 from the borehole or from the well pipe 3 or the riser pipe 45 can take place via the hoist. The

Eccentric screw pump 7 passes through the riser 45 therethrough. The riser 45 is fluidically bonded to the bypass lines 26, so that the

Medium is continued during operation of the eccentric screw pump 7 from the bypass lines 26 to the riser 45 and then leaves the well.

Pumping system 1 in the area A.

Very clearly visible in the cross section shown on the left side again the bypass lines 26, via which the medium from the pressure region 35 in the direction of Drilled hole opening and discharged by means of the riser 45 from the well. In this case, the medium passes through a further pressure region 35a, as exemplified in FIG. The bypass lines 26 are formed in the housing 8.

Shown is also an electrical line connection 47, via which the motor 5 (see FIG. About spacers 49, a distance between the housing 8 and the well pipe 3 is permanently formed for the electrical line connection 47, so that damage to the electrical

Line connection 47 can be excluded.

2, the medium is supplied via the annular channel 11 (see FIG. The flow path from the suction region 19 in the direction of the eccentric screw pump 7 is again indicated in FIG. 2 by means of an arrow. By the

Eccentric screw pump 7, the medium in the conveying direction 51 and in the direction of the borehole bottom to the pressure region 35 and from there proceeding via the bypass lines 26 already described and guided via the riser 45 from the borehole. For sealing the pressure region 35 with respect to the suction region 19 sealing elements 28 are provided.

The threaded pin 43, which has already been shown in FIG. 1 and protrudes from the eccentric screw pump 7 at the upper end, can furthermore be seen in FIG. Appropriate fixing means can be fastened to the threaded pin 43 in order to lift the eccentric screw pump 7 out of the borehole via a winch.

FIG. 3 shows a detailed view of the longitudinal section in region B from FIG. 1 and a cross section through the embodiment of a device according to the invention

Pumping system 1 in the area B. The electrical line connection 47, which is guided in a shaft formed with the aid of the spacer elements 49, can still be seen in Figure 3.

Arranged on the outer circumference of the stator 13 are a plurality of spacers 53, which are oriented parallel to the longitudinal extent of the well pipe 3 and on which

Abut centering 55. The spacers 53 are connected to the stator 13 and are thus moved together with the eccentric screw pump 7 upon removal of the eccentric screw pump 7 from the borehole. They each extend, like can be seen in the right-hand longitudinal section of Figure 3, over a certain distance parallel to the longitudinal axis of the well pipe. 3

In the well pipe 3 or in the housing 8, a plurality of such elastic centering elements 55 are provided, which together provide a positive guide for the eccentric screw pump 7 in its axial movement. The arrow depiction further illustrates the volume flow of the medium.

As can be seen in FIG. 3 and also in the preceding FIG. 2, the eccentric screw pump 7, the centering elements 55 and the housing 8 are offset eccentrically in the well pipe 3, so that the electrical line connection 47 can be guided along the well pipe 3 in the free space F resulting therefrom ,

FIG. 4 shows a detailed view of the longitudinal section in region C from FIG. 1. As can be seen in FIG. 4, the medium is moved via the rotor 15 'in the direction of a borehole bottom and fed to the pressure region 35. About the rotor 15, a movement of the medium takes place in the opposite direction. The rotor 15 and the rotor 15 'in this case meet in the pressure region 35 and are rotatably coupled together.

For this reason, the axial forces 30 of the rotors 15 and 15 ', which are indicated by means of arrow representation, oriented in opposite directions to each other and cancel each other.

Although the eccentric screw pump 7 axial freedom of movement in

Has direction of a hole opening, this does not move relative to the well pipe 3 and the housing 8, since the axial forces, as indicated by arrow 30, in a structural design of a pumping system 1 according to

Cancel the embodiment completely.

In the pressure region 35, openings 57 are provided, via which the medium flows into the bypass lines 26 and is transported further in the direction of the riser 45 (cf. FIG. 2) or in the direction of the borehole opening.

The rotors 15 and 15 'may be made in one piece, but in other embodiments in the pressure region 35 via suitable coupling means rotatably connected to each other. Next, the rotors 15 and 15 'have a different pitch, resulting in the promotion of the medium in different directions. Moreover, FIG. 4 reveals the electrical line connection 47 which extends between the housing 8 and the well pipe 3 along the pressure region 35 parallel to the longitudinal axis of the well pipe 3. The annular channel 11 also extends along the pressure region 35 and guides the medium fluidically separated from the volume flow of the bypass lines 26 to the suction region 19. The promotion of the medium in the

Ring channel 11 is effected by means of the rotor 15 '.

FIG. 5 shows a detailed view of the longitudinal section in region D from FIG. 1. In particular, FIG. 5 shows again the sealing element 28, which is carried by the connecting piece 60 and inserted into a groove of the connecting piece 60. The sealing element 28 extends completely around the

Outer surface of the connecting piece 60 and is at removal of the

Eccentric screw pump 7 out of the riser 45 and out of the well together with the eccentric screw pump 7 from the riser 45 and out of the borehole. If wear of the sealing element 28 can be noted, an exchange of the sealing element 28 can take place by removing the eccentric screw pump 7 from the borehole.

If the eccentric screw pump 7, as shown in Figure 5, inserted into the well or into the well pipe 3, the sealing member 28 is in surface contact with the housing 8. By means of the sealing element 28 thus the pressure region 35, as shown by way of example in Figure 4 is fluidly sealed, so that a passage of medium between the housing 8 and connector 60 via the sealing member 28 and its abutment on the housing 8 is prevented.

Also in the region D of the pumping system 1, as can be seen in Figure 5, the annular channel 1 1 extends parallel to the well pipe 3 along the

Eccentric screw pump 7.

FIG. 6 shows a detailed view of the longitudinal section in the region E from FIG. 1. The eccentric screw pump 7 is received in a form-fitting manner through the housing 8 at an end 14 pointing in the direction of the borehole bottom or at an end 5 pointing in the direction of the motor 5 (see FIGS. 1, 7) in this case with axial and in the direction of a well opening oriented freedom of movement held by the housing 8.

By the positive connection between the. Shown in Figure 6

Eccentric screw pump 7 and the housing 8 and between the stator 13 and the housing 8 radial forces of the eccentric screw pump 7 can be absorbed by the housing 8. The housing 8 is for this purpose with a motor 5, as shown in detail in the following figure 7, in conjunction. The motor 5 receives the transmitted to the housing 8 radial forces. In order to prevent a relative rotation of the eccentric screw pump 7 to the housing 8 and the stator 13 to the housing 8, is a

Anti-rotation 17 is provided. About the rotation 17, the stator 13 of the eccentric screw pump 7 is held. Next, the anti-rotation 17 is fixedly connected to the housing 8, so that due to an eccentric movement of the rotor 15 resulting moment of the stator 13 is received by the housing 8. As previously mentioned, the housing 8 is coupled to the motor 5 (see FIG. 7). The optionally transmitted from the stator 13 to the housing 8 via the rotation 17 torque can thus be absorbed by the motor 5.

If the eccentric screw pump 7 is removed axially from the borehole or via the riser 45 from the well pipe 3, then the housing 8 and the anti-rotation 17 continue to be installed in .Brunnenrohr 3 and pump 7 with axial movement of the eccentric screw not together with the

Eccentric screw pump 7 moves.

FIG. 7 shows a detailed view of the longitudinal section in the region F from FIG. 1. FIG. 7 once again shows the motor 5 already shown in FIG. 1, which is embodied as a submersible motor or as an asynchronous motor. The motor 5 is installed by means of riser 45 fixed in the well or in the well pipe 3 and is supplied via the electrical line connection 47 with energy.

As can be seen in the summary of the preceding figures, the electrical line connection 47 extends from the motor 5 in the well pipe 3 to beyond a borehole opening, where the line connection 47 is coupled to a pipeline network. In preferred embodiments, the electrical line connection 47 is provided with a jacket to damage the electrical

To exclude line connections 47. In the embodiment of Figure 7, the motor 5 drives a hub 27, which is a

Internal toothing forms and with the serrations 21 of the flexible shaft 9 is positively engaged. The drive shaft 59 for the hub 27 can be seen very well in FIG. From the positive connection between internal toothing of the hub 27 and serration 21 of the flexible shaft 9 results with rotational movement of the hub 27 via the drive motor 5, a rotational movement of the flexible shaft. 9

The flexible shaft 9 is rotatably coupled to the rotor 15 of the eccentric screw pump 7, so that by means of the described positive connection, the rotor 15 and the eccentric screw pump 7 can be driven via the motor 5.

The described positive connection between serrations 21 and internal teeth of the hub 27 is in this case such that the flexible shaft 9 and thus the standing with the flexible shaft 9 in connection eccentric screw pump 7 has a freedom of movement in the axial direction. The eccentric screw pump 7 can thus be deducted together with the flexible shaft 9 from the motor 5, without the axial freedom of movement of the eccentric screw pump 7 in the direction of a well opening is hindered by the described positive connection.

As previously mentioned, the housing 8 is formed in several parts. The lower part or the lower region 6 of the multipart housing 8 can be seen in FIG. Via the lower region 6 of the housing 8 medium to be conveyed passes into the interior of the housing 8. For this purpose, in the housing. 8

or in the lower region 6 of the housing 8 a plurality of openings 10 are formed, which allow an inflow of medium into the housing 8.

Since the pointing in the direction of the bottom of the hole end 14 of

Eccentric screw pump 7, as shown in Figure 6, positively received by the housing 8, the medium entering through the openings 10 in the housing 8 by the eccentric screw pump 7 in the direction of the printing area 35 (see Figure 4) transported.

Further, 8 holes 23 are formed in the lower portion 6 of the housing, which are each inclined in the direction of a borehole bottom or in the direction of the motor 5. As occur in practice through the openings 10 solids in the housing 8 and in the lower portion 6 of the housing 8, it can be when settling the solids to problems with a change of

Eccentric screw pump 7 or come in reintroducing a flexible shaft 9 in the hub 27. Advantageously, the holes 23 offer the possibility of removing solids from the housing 8, which settle in the housing 8 or in the lower region 6 of the housing 8. A risk of clogging of the toothing of the hub 27 can be reduced thereby. Since the eccentric screw pump 7 acts on the respective medium sucking during rotation of the rotor 15 and the eccentric screw pump 7 is positively received by the housing 8, due to the suction medium through the

Bores 23 also guided into the interior of the housing 8 and into the interior of the lower portion 6 of the housing 8.

Figure 8 shows a schematic view of an embodiment of a

Eccentric screw pump 7, as may be provided for the inventive pumping system 1 and for implementing the method according to the invention in various embodiments. In particular, FIG. 8 once again illustrates the possible flow pattern of the respective medium when using a

Eccentric screw pump 7 according to the structural design of the

Embodiment of Figures 1 to 8.

The eccentric screw pump 7 has two rotors 15 and 15 ', which are rotatably connected to each other and have different slopes. As a result of the different gradients, the medium is transported by the upper rotor 15 'in the direction of a borehole bottom. Via the lower rotor 15, the medium is transported in the direction of a borehole opening and opposite to the transport direction of the upper rotor 15 '. Both rotors 15 and 15 'are driven together by the motor 5, which is designed as an asynchronous motor. For this purpose, the rotors 15 and 15 'rotatably connected to each other.

The rotors 15 and 15 'meet in a pressure region 35 or the rotors 15 and 15' convey the medium in each case into a pressure region 35, which may be formed as part of the eccentric screw pump 7.

In the pressure region 35, the eccentric screw pump 7 has one or more openings 57 (see FIG. 4). In the embodiment of Figure 7 forms the

Eccentric screw pump 7 has a lateral opening, which is in fluid communication with a channel guide for discharging the medium from the borehole. As in the

Pressure range 35 pressure prevails, the medium is pressurized via the channel guide out of the borehole. Due to the different conveying direction of the rotors 15 and 15 'for the respective medium, the axial forces acting on the rotors 15 and 15' are oriented in opposite directions to each other and at least cancel each other out largely on. For this reason, the eccentric screw pump 7 can be stored without an axial fixing designed in the direction of a borehole opening.

About the rotor 15 ', the medium is sucked and initially guided laterally past the eccentric screw pump 7, before it enters the eccentric screw pump 7.

The invention has been described with reference to a preferred embodiment. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims.

LIST OF REFERENCES

1 pumping system

3 well pipe

5 engine

6 Lower area of the housing

7 eccentric screw pump

8 housing

9 Flexible shaft

10 opening

1 1 Ring-shaped channel

13 stator

14 stator end

15 rotor

16 lining

17 anti-twist device

19 suction area

20 connecting means

21 serration

23 holes

24 channel connection

25 connecting means

26 bypass line

27 recording hub

28 sealing element

30 axial forces

32 outlet

35 pressure range

37 rotor stop

39 inlet opening

41 stator suction port

43 threaded pin

45 riser

47 Electrical connection 49 Spacer element

51 conveying direction 3 spacers

5 centering element

7 openings

9 drive shaft

0 Perforated connector

F free space

Claims

A pumping system (1) for delivering viscous or partially viscous media from a well, comprising a downhole well pipe (3), a riser pipe (45) and a motor (5) coupled to an eccentric screw pump (7), the progressive cavity pump (7) one or more stators (13) and one or more eccentrically rotating and in the one or more stators (13) received rotors (15, 15 ') and one or more connecting means (20, 25) via which the eccentric screw pump ( 7) non-positively and / or positively in

Well pipe (3) is fixed, characterized in that the

Eccentric screw pump (7) for the purpose of their removal from the wellbore over the one or more connecting means (20. 25) is held with axial freedom of movement.

A pumping system (1) according to claim 1, wherein the connecting means (20, 25) comprise at least one downhole housing (8) with medium suction openings (10) between the housing (8) and the housing

Eccentric screw pump (7) is formed a fluidic connection.

A pumping system (1) according to claim 2, wherein the housing (8) communicates with an anti-rotation device (17) which inhibits rotational movement of the one or more stators (13).

Pumping system (1) according to claim 2 or claim 3, wherein the housing (8) on the bottom side one or more bores (23) for discharging solid constituents of the medium to be conveyed.

Pumping system (1) according to one or more of claims 2 to 4, wherein the housing (8) rotatably with the motor (5) is in communication.

Pumping system (1) according to one or more of claims 2 to 5, wherein the housing (8) is installed eccentrically to a longitudinal axis of the well pipe (3) in the borehole and comprises one or more spacer elements (49) and / or with one or more Spacer elements (49) is in communication, which form along the well pipe (3) extending shaft for receiving a motor (5) coupled to the electrical line connection (47).

7. Pumping system (1) according to one or more of claims 1 to 6, wherein the one or more rotors (15, 15 ') at its in the direction of the motor (5) facing the free end form a toothing and / or rotationally fixed with a toothing in

Are brought into connection, which engages positively in a via the motor (5) rotatably driven counter-toothing.

8. A pumping system (1) according to claim 7, wherein the one or more rotors (15, 15 ') with a preferably flexible shaft (9) rotatably in communication, which at its free and in the direction of the motor (5) facing end a serration (21) for positive engagement in the via the motor (5) rotatably driven counter-toothing forms.

Pumping system (1) according to one or more of Claims 1 to 8, in which the connecting means (20, 25) comprise one or more elastic centering elements (55) arranged along the longitudinal direction of the borehole and a position of the eccentric screw pump (7 ) in the well pipe (3) at least

approximate.

10. Pumping system (1) according to one or more of claims 1 to 9, wherein the eccentric screw pump (7) comprises:

- At least a first rotor (15) which is designed to promote the respective medium in the direction of a borehole opening, - at least one second rotor (15 '), which rotatably connected to the at least one first rotor (15) and for conveying the respective medium is formed in the direction of a borehole bottom, wherein the at least one first rotor (15) and the at least one second rotor (15 ') meet in a pressure region (35) which is fluidic with a channel system (24) for guiding the medium out of the borehole communicates.

11. Pumping system (1) according to claim 10, wherein the at least one second rotor (15 ') for conveying the respective medium is brought into contact with at least one dedicated suction channel which extends along the

Well pipe (3) extends in the direction of the borehole bottom.

12. Pumping system (1) according to claim 11, wherein the at least one dedicated suction channel as a preferably radially around the eccentric screw pump (7) guided annular channel (1 1) is formed.

13. A method for removing an eccentric screw pump (7), from a well pipe (3) installed in a borehole, which eccentric screw pump (7) one or more stators (13) and one or more eccentrically rotating and in the one or more stators (13) recorded Rotor (15, 15 ') and via one or more connecting means (20, 25') in the well pipe (3) is fixed, characterized in that the one or more connecting means (20, 25 ') an axial movement of the eccentric screw pump (7 ) in the direction of a borehole opening, and the eccentric screw pump (7) is lifted out of the borehole via a pulling movement oriented in the direction of the borehole opening.

14. The method of claim 13, wherein the eccentric screw pump (7) when lifting from the borehole a riser (45) passes. 15. The method of claim 14, wherein the eccentric screw pump (7) is coupled to a winch, which winds the pulling movement for lifting the

Progressing cavity pump (7) from the well causes.

16. The method according to claim 14 or claim 15, wherein after removal of the eccentric screw pump (7) an eccentric screw pump (7) inserted into the well pipe (3) and as a result her pointing in the direction of a borehole bottom free end form-fitting by a housing (8) trained connecting means (20) is received.