EP0372535B1 - Procéde pour la construction d'un point de mesure des eaux souterraines et dispositif pour l'exécution de ce procéde - Google Patents

Procéde pour la construction d'un point de mesure des eaux souterraines et dispositif pour l'exécution de ce procéde Download PDF

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Publication number
EP0372535B1
EP0372535B1 EP89122516A EP89122516A EP0372535B1 EP 0372535 B1 EP0372535 B1 EP 0372535B1 EP 89122516 A EP89122516 A EP 89122516A EP 89122516 A EP89122516 A EP 89122516A EP 0372535 B1 EP0372535 B1 EP 0372535B1
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EP
European Patent Office
Prior art keywords
intermediate section
apertures
tubular conduit
bore
connection member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89122516A
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German (de)
English (en)
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EP0372535A1 (fr
Inventor
Helmut Rohde
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Preussag AG
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Preussag AG
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Publication of EP0372535A1 publication Critical patent/EP0372535A1/fr
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes

Definitions

  • the invention relates to a method for building a groundwater measuring point, in which a pipeline with a water inlet opening at its lower end is installed in a borehole in the ground and in which the annular space between the pipeline un the borehole wall in the region of the water inlet opening with filter material and for sealing water-bearing layers is filled with essentially water-impermeable material, an intermediate piece with closable, radial openings being inserted into the pipeline above the water inlet opening, after the installation of the pipeline and the filling of the filter material layer, a cementing rod is inserted into the pipeline and connected to the openings in the intermediate piece and a liquid sealing compound which solidifies after insertion is pumped into the annular space above the filter material layer by the cementing rod and the openings.
  • Groundwater measuring points also called level wells or groundwater observation wells, are required in the catchment area of water extraction systems in order to be able to carry out a quality control of the groundwater before the groundwater enters the extraction well.
  • the depth of which can be more than 1000 m bores of 180 mm in diameter are often drilled according to the prior art, into which a pipeline composed of plastic pipes with an outer diameter of 75 mm is subsequently installed.
  • the annulus between the bore wall and the pipeline is in front all in the area of the filter pipe located at the lower end of the pipeline, but also mainly filled with gravel, whereby clay barriers are installed between individual gravel beds in order to separate the water-bearing floors found when the well was sunk and to prevent mixing or unwanted contamination of the groundwater prevent.
  • the clay material to form the sound barriers is also poured into the bore as a bed.
  • DE-PS 30 12 709 such an expansion is shown using the example of a multiple level of comparatively shallow depth.
  • a disadvantage of this known procedure is that the filling of the annular space requires a considerable amount of time, particularly in the case of groundwater measuring points of greater depth, since very long pauses after the introduction of the different materials are required in order to be able to monitor the correct fit of the individual fillings by means of soldering. With deeper bores there is also often the problem that the backfilling gets stuck in the upper region of the bore and can only be brought into the intended position with great difficulty and with considerable expenditure of time. If the clay barriers are leaking due to inadequate backfilling or if they are not in the right place, there can be external inflows that render the groundwater measuring point unusable.
  • EP-A-0 177 623 discloses a method of the type mentioned at the outset for the construction of water extraction wells, in which cement milk is used as the subsequently solidifying material to fill the annular space between the pipeline and the wall of the borehole.
  • cement milk is used as the subsequently solidifying material to fill the annular space between the pipeline and the wall of the borehole.
  • jacket cementation is not suitable because of the particularly high tightness requirements there and because of the exclusively used plastic pipes.
  • the sealing compound to be introduced into the annular space consists of a pumpable suspension of clay powder, cement and water and contains approximately four parts clay powder and approximately one part cement.
  • the density of the suspension is preferably adjusted to 1.29 to 1.32 g / cm 3.
  • the sealing compound according to the invention penetrates completely into all areas of the annular space to be filled and, after it has solidified, ensures a complete seal with respect to the individual floors in all separating layers of the drilled profile. Subsequent subsidence is avoided, as no voids remain empty.
  • the filter material is covered with a layer of clay before the suspension is introduced.
  • the invention further relates to a device for performing the specified method, consisting of a tubular intermediate piece which can be installed in the pipeline and which can be closed with radial openings which is the same or smaller in inside diameter than the inside diameter of the pipe and which is in the bore below the openings protruding stop has an insert that can be inserted into the intermediate piece and which is in contact with the stop by the Pipe can be inserted into the intermediate piece and closes the bore of the intermediate piece and consists of a cementing rod that can be connected to the connecting piece and can be installed in the pipeline, the outlet opening of which can be connected to the openings through a channel in the connecting piece.
  • a pressure transmission device which contains a pressure introduction tube and two closure members, each consisting of an inner, elastic tube, the end regions of which are provided on both sides by means of a fastening clamp and a support ring and a toothed ring are attached.
  • the pressure introduction pipe is surrounded by an intermediate pipe which is open at the bottom and to which the elastic pipes are fastened.
  • the elastic pipes are connected to the pressure introduction pipe via pipe sockets and can be pressurized via this.
  • a device for carrying out a cementing process which has a tubular intermediate piece which can be installed in the pipeline and which can be closed with radial openings and which has a stop projecting into its bore below the openings.
  • a sleeve is inserted into the intermediate piece, which contains a check valve, the housing body of which consists of an easily destructible material, for example cement or aluminum.
  • the sleeve is closed with a cementation plug and, by a pressure built up in the pipeline, pushed until it touches the stop, thereby opening the radial openings in the intermediate piece.
  • the cement suspension is then poured in directly through the expansion piping.
  • valves for cementing a multi-zone borehole in a tubing string inserted into the borehole which valves can be opened with the aid of an actuating tool which is attached to a cementing rod.
  • a foot tube is attached to the cementing rod under the tool.
  • the invention has for its object to provide a simple device with which the annular space between the built-in pipe and the bore wall can be filled with the pumpable and then solidifying sealant without the risk of damage to the pipe and at the lower end of the Pipeline arranged filter pipes for water entry exists.
  • connection piece has sealing rings above and below the openings, which bear against the bore of the intermediate piece in a pressure-tight manner, that the connection piece consists of a sleeve which can be closed at the lower end and has radial openings in the orientation opposite the openings in the intermediate piece and has a longitudinal groove into which the stop of the Intermediate piece engages and that in the bottom of the connecting piece a check valve blocking the sump is arranged, which is connected to the channel in the connecting piece.
  • the cementing device according to the invention has the advantage that after filling the annular space and expanding the cementing rod with the connecting piece, the interior of the pipeline is freely accessible up to the area of the water inlet opening and can be used on site with the devices for conveying before water samples or for examining the groundwater can be.
  • the device according to the invention is easy to use.
  • the check valve in the bottom of the sleeve allows the liquid in the pipeline to pass through the connector when the cementing rod is installed. This prevents the connection piece from displacing the liquid in the manner of a plunger piston and thus generating a buoyancy which complicates the lowering of the cementing rod.
  • flaps can be provided which rest on the outer surface of the intermediate piece and are held in a radially movable manner by leaf springs.
  • Figure 1 shows the profile of a groundwater measuring point, which was expanded in the usual way belonging to the prior art.
  • a pipe made of plastic pipes was inserted into a bore 1 drilled to a depth of -210 m with a diameter of 220 mm in the range from 0 to -50 m and a diameter of 175 mm in the range from -50 to - 210 m 2 installed, which has at its lower end in the range from -198 to -206 m a filter tube 3 and then a sump tube 4.
  • the sump tube 4 ends at a depth of -208 m and is closed there.
  • the nominal diameter of pipeline 2 is from 0 to -40 m 115 mm and below 65 mm.
  • the annular space 5 between the pipeline 2 and the wall of the bore 1 is filled with various filling materials.
  • a gravel fill of grain size 1-2 through which the groundwater reaches the filter tube 3.
  • Section 7 above is filled to a depth of -161 m with filling gravel of grain size 2 - 8.
  • section 8 is designed as a sound seal.
  • a fill follows in section 9 from filling gravel and alternating clay seals in sections 10 - 13 and in between fillings of filling gravel in sections 14 - 17.
  • the described filling of the annular space 5 between the pipeline 2 and the wall of the bore 1 results from the manufacture of the Drilling determined the type and location of the pierced layers and the need to close the pierced barrier layers by installing clay seals in order to prevent water from different floors from mixing and the associated contamination of the groundwater.
  • FIG. 1 The method is explained using the example already shown in FIG. 1.
  • a tubular intermediate piece 18 is inserted into the pipeline 2 a few meters above the filter tube 3, the wall of which has radial openings.
  • a cementing rod 19 inserted through the pipeline is connected to the openings in the intermediate piece 18 and is connected to a pump 20 for days.
  • filter gravel of grain size 1-2 is introduced from outside into the bore 1 to almost below the intermediate piece 18. If the discharge of filter gravel inadvertently increases beyond the intermediate piece 18, the excess amount can be conveyed to the surface again by connecting the cementing rod to a rinsing pump.
  • a liquid, pumpable sealing compound is pumped into the annular space 5 with the aid of the pump 20 via the cementing rod 19 and the openings in the intermediate piece 18 until the annular space in the area of the floors 7-17 is completely filled. Afterwards, an amount of water corresponding to their intake volume is pumped in to clean the pump and the cementing rod.
  • the sealing compound is mixed in a mixing plant, whereby a pumpable suspension is made from powdered clay, cement and water, which becomes solid after application by setting the cement with little or no increase in volume.
  • the cementing rod can be removed immediately after the sealing compound has been pumped in, if the openings in the intermediate piece can be closed by special means. If this is not the case, or if the closure proves to be leaking, the cementing rod must remain installed until the sealing compound has solidified. After removing the cement rod, the passage through the intermediate piece is free. The intermediate piece forms a closed part of the pipeline, since the openings through the sealing compound and gfs. the additional funds are tightly closed. The groundwater measuring point can now be pumped free and put into operation in the usual way.
  • FIG. 3 shows an embodiment of the intermediate piece 18 and a connecting piece 21 adapted to it, which is located at the lower end of the cementing rod 19.
  • the intermediate piece 18 consists of a cylindrical tube 22, which has at its two ends an external thread 23 for screwing on a threaded sleeve for connecting the intermediate piece 18 to the upper and lower branches of the pipeline 2.
  • the tube 22 has in its wall two mutually opposite openings 24 which have the shape of an elongated hole. In the area of the openings 24 are on the The outer surface of the tube 22 has flat contact surfaces 25 on which plate-shaped flaps 26 lie tightly, which completely cover the openings 24. The flaps 26 are held by leaf springs 27 and pressed against the contact surfaces 25.
  • the leaf springs 27 are screwed to the outside of the tube 22 with the interposition of a lining piece 28.
  • a lining piece 28 In the bore 29 of the tube 22 there are two opposing stop knobs 30 below the openings 24.
  • the stop knobs 30 are fastened in the wall of the tube 22 and protrude from the bore 29.
  • the connector 21 consists of a tube 31 which has an internal taper thread 32 at its upper end, into which the lower end of the cementing rod 19 can be screwed.
  • the tube 31 In its central region, the tube 31 has a shoulder with a smaller outside diameter, onto which two sealing rings 33 and a sleeve 34 arranged between the sealing rings are pushed.
  • the sealing rings 33 and the sleeve 34 are held in their position by a head piece 35 which is screwed onto the lower end of the tube 31.
  • a sealing ring 36 is also arranged between the head piece 35 and the tube 31.
  • the head piece 35 has a bore 37 which can be closed by a valve ball 39 arranged in the lower end 38 of the tube 31.
  • a collar 40 in the bore of the tube 31 prevents the valve ball 39 from being flushed up through the tube 31.
  • the connector 21 can be inserted into the bore 29 as shown.
  • the position of the connector 21 is determined by two grooves 41 in the head 35, in which the stop knobs 30 engage. In this way, the connector 21 is fixed in its axial position and in its angular position in the intermediate piece 18.
  • the two sealing rings 33 are located above and below the openings 24 and the openings 24 are opposite openings 42 of the same size, which are formed in the tube 31 and in the sleeve 34. In this way, through the connector 21 a pressure-tight connection between the bore of the cement rod 19 and the openings 24 is created.
  • the sealing compound conveyed by the cementing rod 19 cannot therefore penetrate into the bore 19 of the intermediate piece 18 and the pipeline connected to it.
  • the connector 21 can already be used for days in the construction of a groundwater measuring point in the intermediate piece 18 and installed together with this with the pipeline 2 in the bore 1.
  • the valve ball 39 enables the liquid present in the bore to penetrate into the interior of the pipeline 2 in order to avoid increased buoyancy. If the pipeline 2 is installed, the cementing rod 19 is retracted and screwed to the internal taper thread 32 of the connecting piece 21. Here, the stop knobs 30 secure the connector 21 against rotation.
  • the valve ball 39 closes the bore 37, while the flaps 26 are lifted outward from the contact surfaces 25 by the delivery pressure, so that the sealant can reach the annular space 5 unhindered.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Pipe Accessories (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Geophysics And Detection Of Objects (AREA)

Claims (5)

  1. Procédé pour construire un lieu de mesure de la nappe d'eau souterraine dans lequel est monté, dans une forure (1) située dans la terre, un tuyau (2) équipé d'un orifice d'admission de l'eau (3) sur son pied, et dans lequel procédé la chambre annulaire (5) entre ledit tuyau (2) et la paroi de ladite forure dans la zone dudit orifice d'admission de l'eau (3) est chargée d'un matériau filtrant et, pour l'étanchement des couches d'eau, d'un matériau substantiellement étanche à l'eau, une pièce intercalaire (18) comprenant des ajours radiaux (24) obturables étant montée dans ledit tuyau (2) audessus dudit orifice d'admission de l'eau (3), des tiges de cimentation (19, 21) étant insérées dans ledit tuyau après l'installation dudit tuyau (2) et après la mise en place de la couche de matériau filtrant (6) et étant reliées auxdits ajours (24) dans ladite pièce intercalaire (18), et une masse d'étanchéité liquide se solidifiant suite au chargement étant pompée, à travers lesdites tiges de cimentation (19) et lesdits ajours (24), dans ladite chambre annulaire (5) située au-dessus de ladite couche de matériau filtrant (6), caractérisé en ce que le matériau d'étanchéité est composé d'une suspension d'argile en poudre, de ciment et d'eau, susceptible d'être pompée, et contient environ quatre portions d'argile en poudre et environ une portion de ciment.
  2. Procédé selon la revendication 1, caractérisé en ce que la masse d'étanchéité a une densité d'au moins 1,3 g/cm³.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que le matériau filtrant est couvert d'une couche d'argile avant la mise en place de la masse d'étanchéité.
  4. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications précédentes, comportant une pièce intercalaire (18) tubulaire insérable dans ledit tuyau (2), équipée d'ajours (24) radiaux obturables, le diamètre intérieur de ladite pièce intercalaire étant égal ou inférieur au diamètre intérieur dudit tuyau (2), et équipée d'une butée (30) projettant dans son alésage (29) au-dessous desdits ajours (24), une pièce de raccordement (21) insérable dans ladite pièce intercalaire (18), ladite pièce de raccordement (21) étant insérable à travers ledit tuyau (2) jusqu'à ce qu'elle contacte la butée (30) et obturant ledit alésage (29) de ladite pièce intercalaire (18), et des tiges de cimentation (19) susceptibles d'être reliées avec ladite pièce de raccordement (21) et d être montées dans ledit tuyau (2) et dont l'orifice de sortie est reliable par l'intermédiaire d'un passage (42) dans ladite pièce de raccordement (21) avec lesdits ajours (24), caractérisé en ce que ladite pièce de raccordement (21) est equipée, au-dessus et au-dessous desdits ajours (24, 42), des bagues d'étanchéité (33) venant en butée d'une façon étanche contre ledit alésage (29) de ladite pièce intercalaire (18), que ladite pièce de raccordement (21) est formée d'une douille (31) obturable sur ledit pied (39) et équipée d'ajours radiaux situés face auxdits ajours (24) dans ladite pièce intercalaire (18) dans la position d'orientation et comprend une rainure longitudinale (41) dans laquelle engrène ladite butée, formée d'un nodule (30), de ladite pièce intercalaire (18), et qu'un clapet anti-retour (37, 39) constituant un arrêt vers le puisard et communicant avec ledit passage (42) est disposé dans le fond (38) de ladite pièce de raccordement (21).
  5. Dispositif selon la revendication 4, caractérisé en ce que les ajours (24) radiaux disposés dans ladite pièce intercalaire (18) sont obturables par l'intermédiaire de clapets (26) prenant appui sur la face extérieure de ladite pièce intercalaire (18) et étant maintenue mobile radialement par l'intermédiaire de ressorts à lames (27).
EP89122516A 1988-12-08 1989-12-06 Procéde pour la construction d'un point de mesure des eaux souterraines et dispositif pour l'exécution de ce procéde Expired - Lifetime EP0372535B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3841316A DE3841316A1 (de) 1988-12-08 1988-12-08 Verfahren zum bau einer grundwassermessstelle und vorrichtung zur durchfuehrung des verfahrens
DE3841316 1988-12-08

Publications (2)

Publication Number Publication Date
EP0372535A1 EP0372535A1 (fr) 1990-06-13
EP0372535B1 true EP0372535B1 (fr) 1995-04-12

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Application Number Title Priority Date Filing Date
EP89122516A Expired - Lifetime EP0372535B1 (fr) 1988-12-08 1989-12-06 Procéde pour la construction d'un point de mesure des eaux souterraines et dispositif pour l'exécution de ce procéde

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EP (1) EP0372535B1 (fr)
AT (1) ATE121164T1 (fr)
DE (1) DE3841316A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008020119B4 (de) 2007-04-27 2014-06-12 Ust Umweltsensortechnik Gmbh Vorrichtung zur Ermittlung des Alkoholgehaltes eines Gemischs

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0177623A1 (fr) * 1984-10-08 1986-04-16 Endre Palffy Méthode et installations pour l'installation de puits forés, en particulier ceux produisant de l'eau

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912578A (en) * 1931-11-10 1933-06-06 Halliburton Erle Palmer Method of and apparatus for recovering fluids from underground strata
SE538845C2 (sv) * 1964-12-22 2016-12-27 Iconovo Ab Dry powder inhaler
DE1284915B (de) * 1967-08-10 1968-12-12 Texaco Development Corp Sekundaeres Zementierverfahren fuer ein Mehrfachzonen-Bohrloch
DE3012709C2 (de) * 1980-04-01 1982-05-19 Preussag AG Bauwesen, 3005 Hemmingen Verfahren zum Bau eines Mehrfachpegels sowie Pegelrohranordnung zur Durchführung dieses Verfahrens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0177623A1 (fr) * 1984-10-08 1986-04-16 Endre Palffy Méthode et installations pour l'installation de puits forés, en particulier ceux produisant de l'eau

Also Published As

Publication number Publication date
EP0372535A1 (fr) 1990-06-13
ATE121164T1 (de) 1995-04-15
DE3841316A1 (de) 1990-06-28
DE3841316C2 (fr) 1991-04-25

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