EP2334874A2

EP2334874A2 - Device and method for activating or cleaning wells

Info

Publication number: EP2334874A2
Application number: EP08843205A
Authority: EP
Inventors: Peter Nillert
Original assignee: Individual
Current assignee: Teftorec GmbH
Priority date: 2007-10-23
Filing date: 2008-10-22
Publication date: 2011-06-22
Anticipated expiration: 2028-10-22
Also published as: WO2009052791A2; EP2334874B1; DE202008014113U1; WO2009052791A3; DK2334874T3; DE102007050966A1

Abstract

The invention relates to a device (1) for activating or cleaning filter pipe wells and comprises a first and a second volume body (7, 8), which each extend longitudinally relative to the longitudinal well axis (9), the outside diameters thereof being substantially adjusted to the inside diameter of the filter pipe (5), and the outer peripheral surfaces thereof being configured flexibly with respect to the longitudinal well axis (9) at least radially, such that a sealing effect is achieved between the outer peripheral surfaces of the respective volume bodies (7, 8) and the inside wall of the filter pipe (5). A removal chamber (6) is configured between the first and second volume bodies (7, 8) and the inside wall of the filter pipe (5), wherein said chamber can be hydraulically connected to a pump device and wherein the height (h) thereof is determined from the distance of the two volume bodies (7, 8) relative to each other. The longitudinal extension of the respective volume bodies (7, 8) in the direction of the longitudinal axis corresponds substantially to the height (h) of the removal chamber (6). Alternatively, the height (h) of the removal chamber (6) corresponds to less than 20% of the total length of the device (1).

Description

Dr. Peter Nillert, D-15754 Heidesee

Apparatus and method for activating or cleaning wells

The invention relates to a device for activating or cleaning wells and a corresponding method for the same application.

In the production of filter strands in the ground for the promotion of groundwater, it is necessary after completion of the well structure to challenge from the introduced into an annulus between the filter room and the borehole edge filter gravel or edge contaminants and sanding dischargeable by suffocation sand grains of small diameter. The discharge of such contaminants or particles is called activation. The aim of activating a well is to create as large a pore space as possible in the filter annulus and adjacent soil, so that the flow resistance for the groundwater entering the well is as small as possible and the resulting groundwater pressure drop is minimized at and in the well. Upon activation, silt, fine sand and other small mineral or organic particles that can be transported through the pores of the supporting grain scaffolds with the flowing groundwater at a correspondingly high velocity should also be introduced into the well from the adjacent layers of soil and thus pumped out.

The regeneration of wells includes all measures that are used to remove mineral and / or organic deposits from the well annulus and the adjacent mountains during a well operating period. The methods used for this purpose follow the principle of separation or detachment of deposits and buildup of the filter material and the supporting grain skeleton of the adjacent mountains and the discharge of these particles through the well filter. For the separation and detachment, various methods and devices are known operate hydromechanical, hydropneumatic and chemical principles of action.

For discharging deposited and / or dissolved particles from the annulus and the mountains adjacent thereto, it is necessary to generate as high flow velocities in the area to be cleaned. Known methods and devices used therefor reduce the well filter to be treated to a working section by introducing into the filter tube a working chamber provided with seals at its ends. In the prior art, such a working chamber is described in German Utility Model 81 20 151, wherein between two spaced apart and superposed shut-off bodies and an inner wall of the filter tube, a so-called working chamber is formed. Through this working chamber whose height or length to the total length of the filter tube is comparatively short, an approximately 5- to 10-fold higher flow rate is pumped than is the case with normal well operation over this section of the well filter. Because of the so-called permeability contrast, according to which the water permeability in the gravel bed in the filter annulus is greater than that of the adjacent mountains, the increased flow has only a slight effect on the flow velocity in the annulus and in the adjacent mountains. In addition, it is always the annular space over the entire filter tube length is flowed radially from the upcoming mountains. The groundwater enters the filter tube above and below the working chamber and flows in the annular space and in particular within the filter tube in the direction of the working chamber, wherein the groundwater flowing in the filter tube flows around the shut-off to enter the working chamber laterally. As a result, the flow portion of the well water in the annulus area laterally or radially adjacent to the working chamber is reduced and reduces its flow velocity, which adversely affects the cleaning performance.

Conventional devices, such as according to DE 81 20 151, are subject to the disadvantage that even at a considerably increased delivery rate Cleaning performance in the annulus and especially in the adjacent mountains is not optimal.

Accordingly, the invention has for its object to provide a device and a method for activating or cleaning wells, which intensified by simple means of the particle discharge and the necessary working time is reduced.

This object is achieved by a device having the features of claim 1 and by a method having the features of claim 23. Advantageous developments of the invention are defined in the dependent claims.

A device according to the invention for activating or cleaning filter tube wells comprises a first and a second volume body, each extending longitudinally to the well longitudinal axis, with its outer diameter substantially adapted to the inner diameter of the filter tube and formed on its outer peripheral surface at least radially with respect to the well longitudinal axis, so that a sealing effect between the outer peripheral surfaces of the respective solids and the inner wall of the Filterrrohrs is achieved. Between the first and second volume body and the inner wall of the filter tube, a removal chamber is formed, which is hydraulically connectable with a pumping device and whose height is determined from the distance between the two solids to each other. The longitudinal extension of the respective volume body in the direction of the longitudinal axis of the device substantially corresponds to the height of the removal space.

The device according to the invention is characterized in that the two volumetric bodies fulfill the function of a sealing piston, the volumetric bodies delimiting a central chamber arranged between them in the form of the removal chamber. In their function as a sealing piston, the solids ensure a seal against the filter tube of the well along their entire length. The erfindungsgemäBe device is equally suitable for use in vertical and horizontal filter strands of filter tube wells with built-in annular space between the filter tube and mountains Filterkiesschüttung, as well as for use in well structures without built-in filter gravel. Upon insertion of the device into the filter tube, the second volume first comes into contact with well water. By the sealing piston in the form of the two solids, the filter tube of the well is sealed on both sides of the sampling chamber relative to the annulus or the adjacent mountains, namely in the longitudinal direction of the well. This has the effect that the water flows into the extraction chamber reinforced radially through the annulus or from the adjacent mountains, supplemented by shares of well water, which flow in the areas of the annulus adjacent to the solids axially with respect to the well longitudinal axis in the direction of the sampling chamber and then enter it. The solids thus cause an inflow of the well water to the central open chamber in the form of the extraction chamber, which inflow flows along or parallel to the well longitudinal axis relative to the sealing volumetric solids. Due to the two solids and the increased flow velocity caused by them radially to the annulus, on the one hand the deep cleaning in the mountains and on the other hand the cleaning in the annulus adjacent to the solid bodies is improved.

In an advantageous embodiment of the invention, the distance between the solids can be adjusted, so that the aspect ratio between the height of the extraction space and the longitudinal extent of the solid is variable. The smaller the height of the extraction chamber in relation to a respective longitudinal extent of the two solids, the deeper the cleaning effect extends into the adjacent mountains. By a steepening of the height of the extraction chamber, an adaptation to certain well conditions can be made without the device having to be led out of the filter tube of the well. The distance between the two solids can be achieved, for example, via a length-adjustable telescopic ram or the like, by means of which the Solid bodies are connected to each other at their opposite end faces.

In an advantageous development of the invention, a first or second shut-off disk can be arranged on the solids adjacent to the removal chamber, wherein the two shut-off disks are concentric and in the

Substantially spaced parallel to each other and are adapted with its outer diameter substantially to the inner diameter of the Filterrrohrs. The

Shut-off discs improve the sealing effect of the volume body with respect to the inner wall of the filter tube and a defined delimitation of the volume body to the removal chamber.

In an advantageous development of the invention, the device can have a delivery line which can be brought into connection with the pump device and which is in fluid communication with the removal chamber. The delivery line can pass through the first volume body so that the first volume surrounds the delivery line. Conveniently, the delivery line is designed sufficiently tensile and pressure resistant, so that a displacement of the device is ensured within the filter tube reliable. A detachment of the volume body in such a displacement is advantageously avoided in that they can be attached to the first and the second shut-off disc, for example by means of welding, screwing or the like.

In an advantageous embodiment of the invention, at least one of the two solids can be mounted displaceably on the conveyor line, so that by a displacement of this volume body relative to the feed line along the

Well longitudinal axis of the distance to the other volume and thus the height of the removal chamber is changed. The concerning the

Feed line slidable solids can be determined by a locking device to a defined and consistent

Ensure the height of the removal room. In an advantageous embodiment of the invention, at least one of the two solid bodies can be made of a flexible material and filled by a fluid. By increasing the fluid pressure within the volume body whose outer peripheral surface is movable in the direction of the inner wall of the filter tube, so that the outer peripheral surface presses against the inner wall of the filter tube. As a result, the outer peripheral surface of the volume body is sealed against the inner wall of the filter tube. It is understood that the volume body is pressurized only when pumping well water from the sampling space, wherein the positive pressure within the volume body is reduced to move the device within the filter tube to a new operating position and thereby the outer peripheral surfaces of the volume body out of contact from the Pass inside wall of the filter tube.

In an advantageous embodiment of the invention, a supply line can be guided substantially parallel to the delivery line, which supply line is in fluid communication with the interior of the first and the second volume body. This allows a space-saving feeding of fluid into the volume body to increase the internal pressure when a seal between the volume body and the inner wall of the filter tube is required.

In an advantageous embodiment of the invention, the second volume body, which first comes into contact with well water during insertion of the device into the filter tube, made of the flexible material. At a lower end of the supply line adjacent to the removal chamber opposite edge of the second volume body, a directional control valve may be provided. The first time the device is introduced into the filter tube, the directional control valve can be opened so that the second volume body fills with well water. After closing the directional control valve, the described pressure increase within the second volume body is achieved solely by a comparatively small amount of water, which is conveyed through the supply line into the second volume body. To ensure this Pressure increase, the supply line may be coupled to a vent line. In a well exit of the device, ie when pulling the device out of the filter tube addition, the directional control valve is opened, so that the water can flow out of the second volume out in the well. This has the advantage that the weight of the device at the well exit is considerably reduced.

In an advantageous embodiment of the invention, both solids can be made of the flexible material. In this case, the supply line can pass through the first and the second volume body and be perforated within the respective volume body, so that the fluid connection to the volume body is created by the perforation. It is understood that the supply line is suitably sealed at the connection points to the end faces of the solid, so that an undesired escape of fluid at a pressure increase within the solid is excluded.

In an advantageous embodiment of the invention, at least one of the two solid bodies may consist of a rigid cylindrical body, which is formed with its outer diameter slightly smaller than the inner diameter of the filter tube. On an outer peripheral surface of the cylindrical body, a flexible layer may be disposed. Conveniently, the outer diameter of this flexible layer is slightly larger than the inner diameter of the filter tube. The flexible layer can be made of a foam, in particular an open-cell foam or a foam rubber. When inserting the device into the filter tube, the flexible layer adapts to the inner diameter of the filter tube and sucks completely with the water in the well. As a result, a sufficient tightness between an outer peripheral surface of the cylindrical body and the inner wall of the filter tube is achieved in order to seal the filter tube in this area. The provision of the flexible layer on the outer peripheral surface of the cylindrical body has the advantage that all pressure lines are not required, for example in the form of the aforementioned supply line. Accordingly, a targeted Pressure increase and relief in the solids is not required, which facilitates the operation of the device.

Both variants of the solids, i. the inflatable embodiment consisting of the flexible material, as well as the embodiment as a rigid

Cylindrical bodies with the flexible layer of foam, foam or the like on the outer circumferential surface are suitable for use in so-called winding wire filters, wherein the characteristic relief structure of

Filter tube inner wall is suitably sealed by the solid body against a flow of water between the filter wire rods.

In an advantageous development of the invention, in the variant of the volume body with the flexible layer on the outer peripheral surface of the cylindrical body, this flexible layer can be exchanged if the cell structure of this layer is attacked or damaged by frequent displacement of the device along the well longitudinal axis.

In an advantageous embodiment of the invention, the two solids can be integrally formed from an annular cylinder whose outer wall is formed perforated at least in the region of the removal chamber. Thus, the two solid bodies respectively form the upper and lower part of the device. A lower part of the device, ie the second volume body is in this case closed at its lower end side, wherein an upper part of the device, that is, the first volume body at its upper end side has an opening in which the delivery line leads into or is secured therein. On the outer circumferential surface of the annular cylinder, sealing elements, eg in the form of the above-described pressure-controlled sealing bodies or in the form of the flexible layer, can be mounted adjacent to the removal chamber, ie in an upper and lower region of the cylinder, which ensure a seal against an inner wall of the well filter tube , If the perforation of the annular cylinder extends beyond more than its central portion, the length of the outer wall of the annular cylinder may be adjacent to the extraction chamber or whose height is adjusted by a length of the applied on the outer peripheral surface of the annular cylinder seal body.

In an advantageous embodiment of the invention, the shut-off discs may each be formed of two disc elements, between which a sealing disc is enclosed, wherein an outer diameter of the disc elements smaller than the inner diameter of the filter tube and an outer diameter of the sealing washer are larger than the inner diameter of the filter tube. A respective sealing disc may be made of a soft rubber or the like, which is fastened between a shut-off disc and a further sheet-metal disc having a diameter similar or similar to the blocking disc. The sealing disc obstructs in the variant of the volume body with a flexible layer on the outer peripheral surface of the cylindrical body, a flow around the shut-off of the flexible layer into the extraction chamber, whereby the cleaning of the adjacent annular space is improved.

In an advantageous embodiment of the invention, the delivery line can completely pass through the removal chamber and be guided to the second shut-off, wherein the delivery line is formed perforated within the removal chamber. This allows a simple and robust construction of the device, since the second shut-off disc can be fixed to a lower free end side of the conveyor line. A fluid connection between the delivery line and the removal chamber is ensured by the perforation, wherein the perforation is chosen sufficiently large taking into account the particles to be discharged.

In an advantageous embodiment of the invention, the longitudinal extent of the first and second volume body along the filter tube may be substantially the same length. This supports a uniform cleaning action of the annulus on both sides of the extraction chamber. Another advantage is when the longitudinal extent of each volume body substantially corresponds to the height of the removal space. In this case, the entire length or height of the device to one third by the height of the sampling room and two Third determined by the longitudinal extent of the solid. Such an embodiment of the device enables efficient cleaning or activation of the well, since each section of the filter tube, with the exception of the lowermost and the uppermost, is passed through in each case three times after a corresponding displacement of the device within the filter tube. In this case, virtually a pre-cleaning, a deep cleaning and a post-cleaning of each filter section takes place, wherein a measurement and control of the cleaning process can be performed integrally for all three sections.

In an alternative embodiment of the device, the height of the sampling chamber may be less than about 20% of the total length of the device along the longitudinal axis of the filter tube, in particular less than about 10% of this total length. In this case, the removal chamber takes the form of a gap chamber, wherein the distance between the two solid bodies is small to each other. As a result, the deep cleaning in the adjacent edge of the borehole mountains due to an increased flow rate can be significantly improved.

A method according to the invention for activating or cleaning filter tube wells comprises the following steps: a) Provision of a device, as explained above, whereby the device is operated by applying a suction pressure to the withdrawal chamber by means of the pumping device, so that water is conveyed out of the removal chamber and thus B) inserting the device into a filter tube of a filter tube well until the device is completely submerged in the well water; c) operating the device in an initial operating position in which the device is located in a specific position with respect to the well longitudinal axis; d) shifting the device by a distance to a further operating position, which distance substantially corresponds to the height of the extraction space, and e) operation of the device in the further operating position.

The inventive method has the advantage that the device is moved after a first cleaning cycle substantially to the height of the removal chamber in a new operating position, so that in addition to a complete cleaning of the mountains also a two-time intensive cleaning of the same section of the annulus. This happens when, in an advantageous development of the invention, the steps d) and e) are repeated. A displacement of the device in a further operating position can be carried out as a function of a measurement of the solids content of particles contained in the conveyed water, namely, when this solids content falls below an allowable limit. This is an indication that the appropriate well section has been sufficiently cleaned.

In an advantageous development of the method, steps d and e are repeated once in a step f, before in a step g the device is moved to a new operating position in the same direction along the filter tube by a distance that substantially corresponds to the length of the device in that, in the newly set operating position, the end face of the second volume body facing away from the removal space is located at the point at which the front side of the first volume body facing away from the removal space has been arranged in the preceding operating position. Subsequently, in a step h, the device is operated in the new operating position according to step g, wherein a suction pressure is applied to the removal chamber. Such a method is particularly suitable for cleaning or activating a well filter with expanded Filterkiesringraum. Since a respective annular space section is only flowed through once, with such a method, a very fast cleaning of the well along its entire length with respect to the annulus can be made. If such a method is carried out with a device in which the height of the extraction space substantially corresponds to the respective longitudinal extension of the two solids, this device can in step g by a distance be moved, which corresponds to substantially three times the height of the sampling room.

In an alternative embodiment of the method, a device is used in which the height of the withdrawal chamber is less than about 20% of the total length of the device along the longitudinal axis of the filter tube, the device being continuous along the filter tube during steps c) to e) is moved and is constantly in operation. Due to the comparatively small height of the removal chamber, the flow velocity is significantly increased radially with respect to the removal chamber in the adjoining annular space or mountains, so that both an optimal depth action cleaning within the mountains and a continuous displacement of the device within the filter tube are possible.

In an advantageous embodiment of the last-mentioned method, the height of the removal chamber is less than approximately 10% of the total length of the device, and in particular less than approximately 5% of the total length of the device. In this case, the removal chamber takes the form of a gap chamber, wherein the distance between the two solid bodies is small to each other. In this case, the flow velocity is increased radially with respect to the removal chamber or the gap chamber, thereby further improving the deep cleaning in the mountains.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is illustrated schematically below with reference to several embodiments in the drawing, and will be described in detail with reference to the drawings. Show it: Fig. 1 is a simplified longitudinal cross-sectional view of an inventive

2 shows a longitudinal cross-sectional view of the device of FIG. 1 in one

Filter tube of a well with ring gravel, Fig. 3a to 3c, the device of Fig. 2 in different operating positions,

Fig. 4 shows the device of Fig. 1 and Fig. 2 in an initial operating position and a further operating position within the filter tube, Fig. 5 device of Fig. 4 in a further operating position when it is displaced in the same direction along the filter tube therein 6 shows a longitudinal cross-sectional view of a device according to the invention in a further embodiment, FIG. 7 shows a longitudinal cross-sectional view of a device according to the invention in a further embodiment,

Fig. 8 is a greatly simplified longitudinal cross-sectional view of a device according to the invention in a further embodiment, in which the distance between the two shut-off discs is adjustable to one another. Fig. 9 is a simplified longitudinal cross-sectional view of an inventive

Device according to another embodiment, and Fig. 10 is a simplified longitudinal cross-sectional view of an inventive

Device according to yet another embodiment.

A first embodiment of a device 1 according to the invention and its structure and method of use will be explained in detail below with reference to FIGS. 1 to 5.

The device 1 comprises a delivery line 2, which can be longitudinally inserted into a filter tube of a well, which will be explained below with reference to FIG. 2. On the delivery line 2, a first shut-off disk 3 and a second shut-off disk 4 are fastened such that the two shut-off disks 3, 4 are concentric and substantially parallel to one another. When the device 1 with its delivery line 2 and the two shut-off disks 3, 4 in a well filter tube, shown in simplified form in Fig. 1 by dashed lines and designated by reference numeral 5 is introduced, between the first and second shut-off disc 3, 4 and an inner wall of the filter tube 5, a removal chamber 6 is formed. The height h of this removal chamber 6 is determined by the distance between the two shut-off disks 3, 4 to each other. Between the two shut-off disks 3, 4, the delivery line 2 is formed with recesses and thus perforated, so that a fluid connection between the delivery line 2 and the removal chamber 6 is present. By applying a suction pressure to the delivery line 2, water can be conveyed out of the removal chamber 6, which is indicated by an arrow F in FIG.

Above the first shut-off disc 3 and outside of the removal chamber 6, a first volume body 7 is arranged, which is penetrated by the delivery line 2. Below the second shut-off disk 4 and outside of the removal chamber 6, a second volume 8 is arranged. Both solid bodies 7, 8 are made of a flexible material, which is symbolized in Fig. 1 by wavy lines. Due to the flexible material, the two solid bodies 7, 8 are flexible radially with respect to the well longitudinal axis 9. The solids 7, 8 are respectively attached to the first and second shut-off disc 3, 4 and extend opposite to the removal chamber 6 along the well longitudinal axis 9. The two solids 7, 8 are adapted in its outer diameter R substantially to an inner diameter of the filter tube 5 ,

Both solids 7, 8 can be filled with a fluid, wherein the outer peripheral surface expands in the direction of the inner wall of the filter tube 5 by increasing the pressure within the volume body. This is indicated in Fig. 1 by dotted lines. If the outer circumferential surface of the two volume bodies 7, 8 comes into contact with the inner wall of the filter tube 5 as a result of said pressure increase and bears against it, a sealing effect can be achieved therebetween.

Fig. 2 shows a longitudinal cross-sectional view of the device 1 of Fig. 1, when it is fully inserted into a filter tube 5 of a well. The well has a borehole edge 10 which encloses an annular space 11. The annulus 11 is expanded with filter gravel or sand, outside of the annulus 11 natural mountains 12 and the aquifer adjacent. Within the annular space 11, the filter tube 5 is used, which is designed for a required water permeability, for example with slots. Parallel to the delivery line 2, a supply line 13 is guided, which passes through both the first volume body 7 and the second volume body 8. Within the solids 7, 8, the supply line 13 is provided with perforated sections 13a, so that a fluid connection between the supply line 13 and an interior of the respective solids 7, 8 is. At a removal chamber 6 opposite end face of the second volume body 8, a directional control valve 14 is provided. The delivery line 2 is formed perforated between the two shut-off discs 3, 4, namely in the form of an inlet seeder 2a.

In a first insertion of the device 1 in the filter tube 5, the second volume body 8 and thus also the directional control valve 14 first comes in contact with well water. In this case, the directional control valve 14 is opened, so that well water can flow from below through the supply line 13 or its perforated sections 13a into the interior of the first and second volume bodies 7, 8. If the device 1 is shifted to an initial operating position within the filter tube 5, the directional control valve 14 is closed again. If now, as indicated by the double arrow of Fig. 2, from above a fluid (eg water) pumped into the two solids 7, 8 and thus the internal pressure within the volume body is increased, expand the outer peripheral surfaces of the volume body 7, 8 radially To move the device 1 within the filter tube 5 to a new operating position, the internal pressure within the first and second volume body 7, 8 suitably reduced, so that the outer peripheral surfaces of the two solid 7 , 8 get out of contact from the inner wall of the filter tube 5. The length L of the device 1 is composed of the height h of the removal chamber 6 and the longitudinal extension of the respective bulk body 7, 8 together. As shown in Fig. 2, the height of the removal chamber 6 and the respective longitudinal extents of the two solid bodies 7, 8 each equal thirds. Hereinafter, in this embodiment, the device will be referred to as a "symmetrical double piston chamber".

With regard to the embodiment according to FIG. 1 or FIG. 2, it is understood that the shut-off disks 3, 4 are optional, so that the functioning of this embodiment is also provided without shut-off disks. When omitting the shut-off disks 3, 4, the end faces of the solids 7, 8 adjacent to the removal chamber 6 expediently stiffened.

Below, an operation of the device 1 and its interaction with the well with respect to a specific well section will be explained in detail with reference to FIGS. 3a to 3c. This well section is indicated in FIGS. 3a to 3c with a double arrow.

With reference to FIG. 3 a, the assumption is made that the device 1 is brought into an initial operating position and an overpressure is set in the two solids 7, 8 in such a way that the two solids rest sealingly against the inner wall of the filter tube 5. Then, a suction pressure is applied to the delivery line 2, so that well water is conveyed out of the removal chamber 6. In the concrete well portion according to the double arrow of Fig. 3a, the filter tube 5 is shut off by the first solid 7. Therefore, well water flows through just this well portion substantially parallel to the well longitudinal axis 9 from above in the direction of the removal chamber 6 of the device 1, which leads to a cleaning of the annular space 11 in this area. The comparatively high flow rate, which sets in the said region of the annular space 11, leads to a thorough discharge of dirt particles and the like.

After an operation of the device 1 in the operating position of Fig. 3a for a sufficiently long time, the device 1 is then in a further Operating position shifted within the filter tube 5, namely approximately a distance corresponding to the height h of the removal chamber 6. This is shown in Fig. 3b. In a renewed operation of the device 1, if after increasing the internal pressure in the two volume bodies 7, 8, a suction pressure is applied to the feed line 2, there is in the marked by the double arrow well section to a pronounced radial inflow of well water into the extraction chamber 6. In Fig. 3b this is indicated by corresponding arrows. This is accompanied by not only a cleaning of the annular space 11, but also a cleaning in the adjacent to the annulus 11 aquifer 12. The purification of the aquifer 12 is related to the increased flow rate in the well section in question, which is due to the fact that because of the barrier effect of First and second volume body 7, 8 adjacent to the removal chamber 6 well water can not flow directly from the filter tube 5 and therefore the flow rate in the annulus area is increased radially adjacent to the removal chamber 6.

Starting from the operating position according to FIG. 3 b, the device 1 is then displaced again within the filter tube 5 by a distance which essentially corresponds to the height of the removal chamber 6. This is shown in Fig. 3c. During a renewed operation of the device 1, well water flows from the well section marked by the double arrow from below through the annular space 11 into the removal chamber 6. As a result, the annular space 11 of this well section is cleaned again. A comparison of FIGS. 3a to 3c illustrates that the well portion marked by the double arrow is cleaned twice with respect to its annulus (FIGS. 3a and 3c), and in the operating position of FIG. 3b not only its annulus but also its annulus adjacent aquifer is cleaned. The operating positions of Fig. 3a and 3c have the effect of a pre-cleaning and a post-cleaning with respect to the Brunnenringraums.

After completion of the fountain cleaning or activation and before a well exit of the device, the directional control valve 14 can be opened to drain the water from the two solids 7, 8 down into the well. This reduces the weight of the device 1 and facilitates withdrawal of the device from the filter tube 5.

Referring now to FIGS. 4 and 5, there is shown a sequence with which the well can be efficiently cleaned by the apparatus of FIG. 1 mainly with respect to its annulus 11.

4 and 5 each show a longitudinal cross-sectional view through the Wellausbau and the device 1. In Fig. 4 left, the device 1 in a

Output operating position shown, analogous to the position of Fig. 3a. At a

Operation of the device 1, in this position, the annular space sections I are thoroughly cleaned, as in these sections well water flows into the extraction chamber 6 substantially parallel to the well longitudinal axis 9 (FIG. The annulus sections I laterally adjoin the first and second solids respectively

7, 8 on. After the annular space sections I have been sufficiently cleaned or activated, the device 1 is moved by a distance that is substantially the same

Height of the removal chamber 6 corresponds, moved in the filter tube 5, which is in

Fig. 4 is shown on the right. In this new operating position, the annular space sections II are then cleaned in a renewed operation of the device 1, which laterally adjacent to the first and second volume body 7, 8.

In addition to the cleaning of the annular space sections I and II as a result of the axial flow of well water into the removal chamber 6, the annular space II (in the operating position shown on the left in FIG. 4) or the annular space I (in the operating position shown on the right in FIG. 4) additionally cleaned by the radial flow of the well water, analogous to the representation of Fig. 3b.

Following an operation of the device in the position shown in Fig. 4 right, the device 1 is displaced within the filter tube 5 in the same direction by a distance which is generally the total length of the device or for the embodiment of FIG. 4 corresponds to three times the height h of the removal chamber 6, cf. Fig. 5. This arrives the end face of the second volume body 8 facing away from the removal space 6 has been arranged at the location at which the front side of the first volume body 7 facing away from the removal space 6 has been arranged in the preceding operating position (FIG. 4, right). Starting from the new operating position of the device 1 shown in Fig. 5, the operations explained with reference to FIG. 4 are repeated. By such a displacement of the device 1 within the filter tube 5 is avoided that a respective annulus section is repeatedly swept by the solids of the device 1. Thus, a fast, yet efficient cleaning of the annular space 11 of the well along its entire length is possible.

Referring to Fig. 6, another embodiment of the apparatus 1 will be explained. The same components in comparison to the device of FIG. 1 or FIG. 2 explained above are provided with the same reference numerals herein and are not explained again to avoid repetition.

The device of Fig. 6 has an axially shortened inlet pipe 2a ', wherein the shut-off disks 3 and 4 have a smaller distance from each other. Accordingly, the height h of the removal chamber 6 is lower. The same applies to the total length L of the device, which is composed of the height h of the removal chamber 6 and the longitudinal extent of the two solids 7, 8. The device according to FIG. 6 is referred to as a "shortened symmetrical double-piston chamber".

As a result of the lower height h of the removal chamber 6, the radial flow laterally adjacent to the removal chamber 6 within the annular space 11 and in the aquifer 12 increases during operation of the device 1. As a result, not only the cleaning within the annular space 11 is improved in this area, but also a cleaning with depth effect within the mountain or the aquifer 12 better possible. When moving the device 1 within the filter tube 5, the offset of the device is limited to the height of the removal chamber 6. The resulting overhead in the Operation of the device is the illustrated deep-acting discharge of particles from the adjacent to the annulus 11 aquifer 12 opposite.

With reference to Fig. 7, a further embodiment of the device 1 is explained, which is particularly suitable for use in wells without filter annulus, i. without built-in filter gravel is suitable. Fig. 7 shows a longitudinal cross-sectional view through the Wellausbau and the device 1, the structure of which is explained in detail below.

In the embodiment of FIG. 7, the device 1 has a delivery line 2 which opens into a first shut-off disc 3 '. Below the first shut-off disc 3 'is a second shut-off disc 4' by means of spacer webs 15 concentric and substantially parallel thereto attached. The first solid T is in the form of a rigid cylindrical body. The delivery line 2 passes through the first volume body 7 ', which is attached to the first shut-off disc 3. The second volume body 8 'is also formed in the form of a rigid cylindrical body which is fixed below the second shut-off disk 4. The two shut-off disks 3 ', 4' are matched with their outer diameter to an inner diameter of the filter tube 5 analogously to the embodiment of FIG. The two solids 7 ', 8' are formed slightly smaller than the inner diameter of the filter tube with their respective outer diameters. On the outer peripheral surfaces of the first and second volume body 7 ', 8', in each case a flexible layer 17 is attached, which is made of an open-cell foam rubber. The layer 17 is formed slightly larger than the inner diameter of the filter tube 5 with its outer diameter.

When inserting the device of FIG. 7 into the filter tube 5, the flexible layers 17 on the first and second solids 7 ', 8' are slightly compressed so that they closely conform to an inner wall of the filter tube 5. Upon contact with well water, the pores of the flexible layer 17 fill, so that a sealing effect between an outer circumferential surface of the first and second volume body 7 ', 8 ¹ and the inner wall of the filter tube 5 forms.

Through the confluence of the delivery line 2 in a corresponding recess of the first shut-off disc 3 ', a fluid connection between the delivery line 2 and between the first and second shut-off disc 3', 4 'formed removal chamber 6' is given. Applying a suction pressure to the delivery line 2 causes a delivery of well water out of the removal chamber 6 ', which at the same time leads to a discharge of particles from the well. The height h of the removal chamber 6 'is approximately 10% of the total length of the device 1. Analogous to the embodiment of Fig. 6, in the device in the embodiment of Fig. 7, because of the sealing effect of the solids 7', 8 ^1, the annulus area becomes radial adjacent to the removal chamber 6 ', including the adjacent aquifer 12 cleaned with depth effect. This is achieved by the high radial flow velocity, in particular in the adjacent mountains in the area between the solids T, 8 '.

The cleaning or activation of the well by means of the device of Fig. 7 is carried out in a continuous process in which the device is continuously displaced within the filter tube 5 during its operation. The optimal rate of displacement may be selected such that dischargeable particles may be transported into the sampling space 6 'from a location located at a certain radial distance from the filter in the annulus during the time that the well water flow acts on that location. The achieved substance discharge can be measured continuously and thus the efficiency of the well cleaning or activation can be controlled. If the substance discharge does not reach a desired value, the operation of the device 1 can be repeated at this point of the well, where appropriate, the displacement speed of the device within the filter tube 5 is contiguous. Thus, the depth effect of the cleaning measure is regulated by the level of the delivery rate. The device according to FIG. 7 is referred to as a "moving double-piston gap chamber" and is particularly suitable for activating and regenerating well structures without built-in filter gravel. Such a type of well is shown in Fig. 7, in which at the well edge 10 of the well directly the mountain or the aquifer 12 adjacent.

It is understood that the foam-like flexible layer 17 can also be used in the device according to one of FIGS. 1 to 6. This has the advantage that a displacement of the device 1 within the filter tube 5 without a change in the internal pressure within the solids 7, 8 is possible and can be done correspondingly faster. In contrast, a pressurization of the volume body 7, 8 is recommended in the event that a particularly good sealing effect between the outer peripheral surfaces of the volume body 7, 8 and the inner wall of the filter tube 5 is necessary, or if the inner surface of the filter tube has such a strong relief, that the flexible layer would be heavily stressed during a displacement of the device within the filter tube.

In FIG. 8, a further embodiment of the device 1 is shown in a basically greatly simplified representation. In this case, the delivery line 2 opens into a corresponding recess of the first shut-off disk 3 "." Below the first shut-off disk 3 ", a second shut-off disk 4" is fastened concentrically and substantially parallel thereto, namely by means of a plurality of telescopic punches 18. The distance of the telescopic pistons can be determined by means of these telescopic punches The height of the removal space between the two shut-off disks is thus adjusted, and a small distance between the two shut-off disks relative to one another is shown with thick solid lines., With dash-dot lines, a changed position for the second shut-off disk 4 shown "in which it has a greater distance from the first shut-off disc 3".

At the first and second shut-off disc 3 ", 4" are each a volume body 7 ", 8" attached, the second shut-off disc 8 "for simplicity only partially shown. Upon insertion of the device 1, the volume bodies 7 ", 8" seal off the filter tube 5. The solid bodies 7 ", 8" can either be produced from a flexible material (cf., FIG. 1) in order to achieve an interference with the inner wall of the filter tube 5 by an increase in internal pressure. Alternatively, the solid bodies 7 ", 8" can also be encased with a flexible layer (see Fig. 7), which ensures a sufficient sealing effect with the inner wall ^'of the filter tube 5. The flexible layer allows a displacement of the device 1 within the filter tube 5, without a pressure medium control with respect to the solid is required. Furthermore, the flexible layer makes it possible to adjust the two shut-off disks 4 "to one another in order to change the height of the removal space 6.

FIG. 9 shows a further embodiment of the device 1 in a longitudinal cross-sectional view. In comparison to the above-mentioned embodiments, components of the same design or the same function are provided with the same reference numerals herein. The first and second solids 7 '", 8'" are both formed as substantially rigid cylindrical body whose outer diameter is slightly smaller than the inner diameter of the filter tube 5 is selected. On the outer peripheral surfaces of the volume body 7 '", 8'" each sealing elements in the form of the flexible layers 17 are mounted, analogous to the explanation of FIG. 7.

The first volume body 7 '"is penetrated by a through-opening 19. The delivery line 2 is passed through this through-opening 19, wherein the inner diameter of the through-opening 19 and the outer diameter of the delivery line are adapted to each other such that the first volume body 7''clamping and play-free on the delivery line 2 in well longitudinal axis 9 can be moved. The second volume body 8 '"is fastened to a free end of the delivery line 2, for example by welding or the like, The delivery line 2 is perforated in its area adjacent to the second volume body 7'". In the same way as in the embodiment of FIG. 1 is between the two solids 7 '", 8'" the removal chamber 6 is formed, wherein a distance of the two volume body 7 '", 8'" determines the height h of the removal chamber 6.

The height h of the removal chamber 6 can be changed by displacing the first volume body 7 '"relative to the delivery line 2. A locking device 20 is attached to the first volume body 7'" by means of which the first volume body 7 '"can be fixed relative to the delivery line The locking device 20 determines a position of the first volume body T "relative to the delivery line 2, resulting in a predetermined height h of the removal space 6. Depending on the nature of the well, in which the device 1 is used, the height h of the removal chamber 6 can either be increased or decreased. The flexible layers 17, which are each attached to an outer circumferential surface of the volume body 7 '", 8'", allow both a displacement of the first volume body T "with respect to the delivery line 2 as well as when the first solid T" locks on the delivery line is a displacement of the 'device 1 within the filter tube 5. As an alternative to the flexible layer 17 may be used on the outer peripheral surfaces of the volume body in each case a pressure-controlled sealing body, in a required sealing seat analogous to the embodiment of FIG. 1 with a fluid under pressure is set. When the first volume body 7 '"or the entire apparatus 1 is displaced, the internal pressure of this sealing body is correspondingly lowered in order to detach it from the inner wall of the filter tube 5. For supplying a fluid into the sealing body, suitable pressure control lines can be guided into the sealing body For a simplified immersion or retraction of the device 1 into or out of the well, the second, ie the lower, volume body 8 '"can be equipped with a directional control valve 14, analogous to the embodiment of FIG.

The device 1 in the embodiment of Figure 9 is characterized by simplicity and robustness, with simple means, the height h of the removal chamber 6 is variable. The height h of the extraction chamber can also be adjusted when the device 1 is already introduced into the filter tube 5. Although not shown in Fig. 9, may be on the solids 7 '", 8'" adjacent to the removal chamber 6 be arranged shut-off discs, analogous to the embodiment of FIG. 1. It is understood that on the first volume T "attached shut-off has a through hole through which the delivery line 2 is passed, to allow a displacement of the first volume body 7 '"in connection with this shut-off disc.

FIG. 10 shows a further embodiment of the device 1 in a longitudinal cross-sectional view. In comparison to the above-mentioned embodiments, components of the same design or the same function are provided with the same reference numerals herein. The first and second solids 7 "", 8 "" are integrally formed from an annular cylinder 21, the first solid 7 "" forming an upper part of this cylinder 21 and the lower solid 8 "" forming a lower part of this cylinder 21. The cylinder 21 is at its lower end, i. is closed at a lower end face of the second volume body 8 "", and has at its upper end, i. on an upper end face of the first volume body 7 "" an opening 22. The cylinder 21 is designed hollow inside and thus forms a removal chamber 6, wherein an outer wall of the cylinder 21 is formed perforated in the region of its middle third. Through this perforation, well water can flow from the outside into the cylinder 21, which is indicated by arrows in FIG.

On an outer peripheral surface of the cylinder 21 in each case flexible layers 17 are mounted in the upper and lower regions, which ensure a sealing of the device 1 relative to the inner wall of the filter tube 5 in the same manner as in the embodiment of FIG. The height or length of the extraction chamber 6 can be adjusted by the length of the flexible layers, which are applied to the outer peripheral surface of the cylinder 21. Perforated areas of the outer wall of the cylinder 5 can be closed by the flexible layers 17. As an alternative to the flexible layers 17, the outer peripheral surface of the cylinder 21 in the region of the first and second volume body 7 "", 8 "" opposite the inner wall of the Filter tube 5 are sealed by internal pressure-controlled sealing body.

The delivery line 2 is from the top through the opening 22 into the removal chamber 6, i. introduced into the interior of the cylinder 21 and connected to a submersible pump 23. The underwater motor pump 23 is received within the cylinder 21 and extends substantially parallel to the longitudinal axis of the cylinder 21. The length of the submersible pump 23 and the number of their motor stages is adapted to the necessary flow rate of the device 1. The underwater motor pump 23 has an inlet pipe 24, which is arranged in front of an inlet of the conveying line and acts as a filter. The underwater motor pump 23 is enveloped in the longitudinal direction by a jacket tube 24, which is open at its lower end side, where the submersible pump 23 ends. The jacket tube 24 is connected adjacent to the inlet pipe 24 fixed to an outer peripheral surface of the feed line 2. The casing tube 24 essentially fulfills two tasks: on the one hand, to direct the water conveyed by the underwater motor pump 23 selectively in the direction of the inlet pipe 24 and, on the other hand, to ensure cooling of the underwater motor pump 23 by the well water flowing past it. For this purpose, it is important that the jacket tube 24 extends in its longitudinal extension to below the last stage of the submersible motor pump 23.

During operation of the underwater motor pump 23, well water is sucked from outside, as shown in FIG. 10, through the perforation of the outer wall of the cylinder 21 into the removal chamber 6, the well water subsequently flowing to the lower, open end side of the jacket tube 24. After entering the

Casing tube, the well water is conveyed past the submersible motor pump 23 upwards in the direction of the inlet pipe 24, and is finally conveyed out of the well in the conveying line 2 as indicated by the arrow F. The embodiment of the device 1 according to FIG. 1 is very robust because of the one-piece nature of the first and second volume body 7 "", 8 "" in the form of the cylinder 21 and can be produced inexpensively. As an alternative to the representation of FIG. 10, the submersible-motor pump 23 can also be arranged outside the cylinder 21 or the removal chamber 6, in particular when the submersible-motor pump 23 has a larger diameter due to a required large pump capacity.

The embodiments according to FIGS. 9 and 10 can be operated in the same way for cleaning or activating a well as the embodiments according to FIG. 2 and FIG. 6 and have the same quality of cleaning action. In order to avoid repetition, reference is made to the explanation of the operation of the device on FIGS. 2 to 6 above.

Claims

claims

1. Device (1) for activating or cleaning filter tube wells with a filter tube (5), comprising a first and a second volume body (7, 8), each extending longitudinally to the well longitudinal axis (9), with its outer diameter substantially to the Adjusted inside diameter of the filter tube (5) and on its outer peripheral surface at least radially with respect to the well longitudinal axis (9) are flexible, so that a sealing effect between the outer peripheral surfaces of the respective volume body (7, 8) and the inner wall of the Filterrrohrs (5) is achieved between the first and second volume body (7, 8) and the inner wall of the filter tube (5) an extraction space (6) is formed, which is hydraulically connectable with a pumping device and whose height (h) from the distance between the two solids (7, 8) to one another, characterized in that the longitudinal extension of the respective volume body (7, 8) in

Direction of the longitudinal axis of the device is substantially equal to the height (h) of the removal chamber (6).

2. Device (1) for activating or cleaning filter tube wells with a filter tube (5), comprising a first and a second volume body (7, 8), each extending longitudinally to the well longitudinal axis (9), with its outer diameter substantially to the Adjusted inside diameter of the filter tube (5) and formed on its outer peripheral surface at least radially with respect to the well longitudinal axis (9) are flexible, so that a

Sealing effect between the outer peripheral surfaces of the respective Volume body (7, 8) and the inner wall of the Filterrrohrs (5) is achieved, wherein between the first and second volume body (7, 8) and the inner wall of the filter tube (5) an extraction space (6) is formed, which with a pumping device hydraulically is connectable and its height

(h) is determined from the distance between the two solid bodies (7, 8) to each other, characterized in that the height (h) of the removal chamber (6) less than about 20% of the total length of the device (1) along the longitudinal axis of the filter tube (5).

3. Device (1) according to claim 1 or 2, wherein the distance between the solids (7, 8) is adjustable, so that the aspect ratio between the height (h) of the removal chamber (6) and the longitudinal extent of the solid (7, 8) is changeable.

4. Device (1) according to claim 3, wherein the solid bodies (7, 8) are connected to each other at their opposite end sides by at least one adjustable in length telescopic ram (18) or the like.

5. Device (1) according to one of claims 1 to 4, wherein on the solid bodies (7, 8) adjacent to the removal chamber each have a first and second shut-off disc (3, 4) are arranged, wherein the two shut-off discs (3, 4 ) are spaced concentrically and substantially parallel to each other and are adapted with its outer diameter substantially to the inner diameter of the Filterrrohrs (5).

6. Device according to one of claims 1 to 5, wherein a can be brought into communication with the pumping means delivery line (2) in fluid communication with the removal chamber (6).

7. Apparatus according to claim 6, wherein the first volume body (7) relative to the conveyor line (2) is displaceable in the longitudinal direction and displaceable in predetermined positions.

8. Device (1) according to claim 6 or 7, wherein the conveying line (2) is designed sufficiently tensile and pressure resistant to ensure a displacement of the device (1) within the filter tube (5).

9. Device (1) according to one of claims 5 to 8, wherein the first volume body (7) is attached to the first shut-off disc (3).

10. Device (1) according to one of claims 5 to 9, wherein the second volume body (8) on the second shut-off disc (4) is fixed.

11. Device (1) according to one of claims 1 to 10, wherein at least one of the two solid body consists of a substantially rigid cylindrical body which is formed with its outer diameter slightly smaller than the inner diameter of the filter tube (5), wherein at one Outer circumferential surface of the cylindrical

Body is arranged a flexible layer (17).

12. Device (1) according to claim 11, wherein the outer diameter of the flexible layer (17) is slightly larger than the inner diameter of the filter tube (5).

13. Device (1) according to claim 12, wherein the flexible layer (17) is made of a foam, in particular an open-cell foam or a foam rubber.

14. Device (1) according to one of claims 11 to 13, wherein the flexible layer (17) is exchangeable.

15. Device according to one of claims 11 to 14, wherein the two volume bodies (7, 8) are integrally formed from an annular cylinder (21), wherein an outer wall of the cylinder (21) in the region of the removal chamber (6) is perforated.

16. The apparatus of claim 15, wherein the conveying line (2) is guided substantially to an outer end side of the first volume body (7).

17. Device (1) according to one of claims 5 to 16, wherein the shut-off discs (3, 4) are each formed from two disc elements, between which a sealing disc is enclosed, wherein an outer diameter of the disc elements smaller than the inner diameter of the filter tube (5 ) and an outer diameter of the sealing disc are larger than the inner diameter of the filter tube (5).

18. Device (1) according to claim 17, wherein a respective sealing disc is made of a soft rubber or the like, which is fastened between a shut-off disc (3, 4) and a further sheet-metal disc with a shut-off disc of the same or the same diameter.

19. Device (1) according to one of claims 6 to 14, wherein the delivery line (2) passes through the removal chamber (6) and is guided to the second shut-off disc (4), wherein the delivery line (2) within the removal chamber (6). perforated is formed.

20. Device (1) according to claim 19, wherein the second shut-off disc (4) on the delivery line (2) is fixed.

21. Device (1) according to one of claims 1 to 20, wherein the longitudinal extent of the first and second volume body (7, 8) is substantially equal.

22. Device (1) according to one of claims 2 to 21, wherein the height (h) of the removal chamber (6) is less than about 10% of the total length of the device (1) along the longitudinal axis of the filter tube (5).

23. A method for activating or cleaning filter tube wells, comprising the steps of: a) providing a device (1) in particular according to one of claims 1 to 22, wherein an operation of the device (1) by applying a suction pressure to the removal chamber (6) by means of the pumping device takes place, so that water is conveyed out of the removal chamber (6) and thus particles are discharged from the filter tube well, b) introducing the device (1) into a filter tube (5) of a filter tube well until the device (1) is completely submerged in well water c) operation of the device (1) in an initial operating position in which the device (1) is arranged in a specific position with respect to the well longitudinal axis (9), d) shifting the device (1) by a distance to a further operating position, which distance is essentially the height (h) of the

Entnahmeraums (6) corresponds, and e) operation of the device (1) in the further operating position.

24. The method of claim 23, wherein the steps d) and e) are repeated.

25. The method according to claim 23 or 24, wherein a displacement of the device (1) in a further operating position then takes place when at the previous operating position a contained in the conveyed water permissible solids content of particles is exceeded.

26. The method according to any one of claims 23 to 25, wherein the device (1) before step d) is taken out of service by the Switched off pumping device or at the removal chamber (6) applied suction pressure is at least lowered.

27. The method according to any one of claims 23 to 26, comprising the steps: f) one-time repetition of steps d and e, g) shifting the device (1) to a new operating position in the same direction along the filter tube (5) by a distance substantially corresponding to the length of the device (1), so that in the newly set operating position, the end face of the second volume body (8) facing away from the removal space (6) is located at the location in the preceding operating position. 6) facing away from the first volume body (7) has been arranged, h) operation of the device (1) in the new operating position according to step g.

28. Method according to claim 27, carried out with a device (1) according to claim 1 or one of claims 3 to 21, wherein in step g the distance by which the device is displaced is substantially three times the height of the withdrawal space (6). equivalent.

29. The method of claim 27 or 28, wherein after step h) step f is passed through.

30. The method according to claim 29, wherein after step h) step f is repeated as many times as corresponds to the length of the filter tube (5) of the well.

31. The method of claim 23 or 24, which is carried out with a device (1) according to any one of claims 2 to 22, wherein the device (1) during steps c to e is continuously displaced along the filter tube (5) and thereby continuously is in operation.