JP2006037385A - Device and method for forming impermeable layer in boring well - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for forming an impermeable layer in a boring well for easily removing an obstruction such as a harmful layer or crack caused in the boring well. <P>SOLUTION: This device 30 for forming the impermeable layer in the boring well 1, which is intended to remove an obstruction caused in a drilled hole 1a, comprises a layer forming body 31 inserted to the hole, a positive electrode 34 provided on the layer forming body, negative electrodes 32 and 33 provided on the layer forming body in positions separated from the positive electrode by a predetermined distance in the inserting direction of the layer forming body, and a DC power source 35 for carrying current to between the positive electrode and the negative electrodes. The positive electrode is located in a desired position near the position where the obstruction is caused, and current is carried from the DC power source in a state where clay-dissolved water 15 containing clay mineral is supplied into the hole to adhere the grains of the clay mineral to the surface of the positive electrode, whereby the impermeable layer 40a is formed to remove the obstruction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a device for forming an impermeable layer in a boring well and a method for forming the same for easily blocking and removing obstacles such as harmful layers and cracks generated in the boring well. More specifically, the clay particles are electrically attached from the dissolved water in which the clay mineral is dissolved in the formation or crack, thereby blocking the harmful layers and cracks generated in the boring well and removing the obstacles. The present invention relates to a permeable layer forming apparatus and a forming method thereof.

  Hot spring wells, water wells, geothermal wells, and the like are constructed by putting casings or strainer pipes in boreholes and pumping them with pumps or the like provided on the ground or in boreholes. In the shallow part of the strainer tube, troubles such as low temperature water discharge and harmful water discharge sometimes occur. In addition, there were cases where failures such as cracks occurred in the formation.

The following techniques are disclosed as means for solving these obstacles.
Push the plug around which the brush material attached to the tip of the water stop chemical injection rod so as to be detachable with pressure water is pushed to the water and spring location with the water stop chemical injection rod, drop the particulate matter, There has been a water shutoff method for water loss and spring water in an intermediate portion of a borehole in which a plug is separated and a waterstop chemical is injected into a granular material layer to solidify (for example, Patent Document 1).

  In addition, an oxidation precipitate of water glass and magnesium chloride, which is a raw material component of hectorite, and an underground crack plugging material made of slurry containing lithium hydroxide at a concentration of 1 to 10 wt% were injected into the rock body. There has also been a technique for causing clogging of the underground crack by causing it to flow in the crack and gelling hectorite in an underground high-temperature environment (for example, Patent Document 2).

  Furthermore, there is also a technology related to underground structures that stop water and shield harmful substances by filling bennite slurry in which ethanol-containing solvent and bennite are mixed into the groundwater in the hole formed in the ground. It was. (For example, patent document 3).

  Further, in the construction method of the impermeable wall, a rod-shaped first electrode connected to the positive electrode is provided along the length direction of the excavation hole, and the negative electrode is provided in the excavation hole spaced a predetermined distance from the first electrode. A second electrode to be connected is provided, and when the hole is filled with a slurry-like water-stopping filler in which clay, mortar, etc. are suspended, and a direct current flows between the electrodes, There was also a technology to construct a water barrier by moving particles such as cement. (For example, patent document 4).

  However, the technique of patent document 1 is a technique for coping with the water loss and spring water during the drilling of the borehole, and re-excavating by reaming after solidifying the water stop liquid. In other words, the technology was not applicable to hot spring wells that actually pump hot springs. Further, the technique of Patent Document 2 is a technique for closing artificially generated cracks, and is a limited technique that can be used only in a high temperature environment. Furthermore, the techniques described in Patent Documents 3 and 4 are techniques for constructing a water shielding wall in a very shallow portion of the basement.

In other words, when a fault such as low temperature water discharge or harmful water discharge occurs in a hot spring well, water well, geothermal well, etc., an impermeable layer (blockage) only at the site where the failure occurred, that is, at an arbitrary depth. There was no technology to remove the obstacles. In other words, there is a problem that there is no technology that can be used for finishing and repairing hot spring wells, water wells, geothermal wells, etc., by easily dealing with only the part where the trouble has occurred and removing the trouble.
On the other hand, if a strainer pipe is installed in a borehole where a low temperature water outflow, harmful water outflow, a crack in the formation, etc. occur, the faulty part remains in the state where the strainer pipe is installed. That is, the establishment of a technique for removing the obstacle by creating an impermeable layer (occlusion layer) only at an arbitrary depth has been awaited.

Japanese Patent Publication No.7-113317 Japanese Patent No. 2636205 JP-A-8-49242 Japanese Patent Publication No. 6-17573

The present invention has been made based on the background described above, and achieves the following objects.
The object of the present invention is that in the case of a borehole used for a hot spring well, a water well, a geothermal well, etc., when a failure such as low temperature water discharge or harmful water discharge occurs, the portion where the failure has occurred or its portion It is an object of the present invention to provide a device for forming an impermeable layer in a boring well and a method for forming the impermeable layer in which a water impermeable layer can be formed at a desired position in the vicinity of the borehole.

The present invention takes the following means in order to solve the above-described problems.
The construction device of the impermeable layer of the borehole of the present invention 1
An impermeable layer generating device in a borehole for removing obstacles generated in excavated holes,
A layer forming main body inserted into the hole, a positive electrode provided in the layer forming main body, and provided in the layer forming main body at a position spaced apart from the positive electrode by a predetermined distance in the insertion direction of the layer forming main body. A negative electrode, and a direct current power source for passing a direct current of a predetermined voltage between the positive electrode and the negative electrode,
The positive electrode is moved to a desired position in the vicinity of the failure occurrence location, and a DC current is supplied from the DC power source between the positive electrode and the negative electrode while supplying clay-dissolved water containing clay minerals into the hole. An impermeable layer in which the particles are agglomerated at a desired position in the vicinity of the failure occurrence point is created by passing an electric current and causing the clay mineral particles to adhere to the surface of the positive electrode, and the failure is removed. It is characterized by being able to.

The impermeable layer generating apparatus in the borehole of the present invention 2 is the present invention 1,
The boring well is characterized in that a strainer pipe is provided in the hole, and the layer forming main body is inserted in an inner peripheral portion of the strainer pipe.

The impermeable layer generating device in the borehole of the present invention 3 is the present invention 1 or 2,
The negative electrode is provided at a plurality of positions in the insertion direction of the layer forming body so as to sandwich the positive electrode.

The impermeable layer construction method in the borehole of the present invention 4
A method for creating an impermeable layer in a borehole for removing obstacles generated in a drilled hole,
Inserting the layer forming body provided with a positive electrode and a negative electrode in a position separated by a predetermined distance in the insertion direction of the layer forming body into the hole, into the hole, and at a desired position in the vicinity of the failure occurrence point, While positioning the positive electrode and supplying clay-dissolved water containing clay mineral in the hole, a DC current of a predetermined voltage is passed between the positive electrode and the negative electrode from a DC power source, and the positive electrode By making the clay mineral particles adhere to the surface of the material, a water-impermeable layer is formed at a desired position in the vicinity of the failure occurrence location, and the failure can be removed.

The impermeable layer construction method in the boring well of the present invention 5 is the present invention 4,
The boring well is characterized in that a strainer pipe is provided in the hole, and the layer forming main body is inserted in an inner peripheral portion of the strainer pipe.

The impermeable layer construction method in the borehole of the present invention 6 is the present invention 4 or 5,
The impermeable layer is characterized in that the boring well is formed at a position where the failure occurrence location and the failure occurrence location can be separated.

The impermeable layer creation method in the boring well of the present invention 7 in the present invention 4 or 5,
The layer forming body is characterized in that the negative electrode is provided at a plurality of positions in the insertion direction of the layer forming body so as to sandwich the positive electrode.

The impermeable layer construction method in the boring well of the present invention 8
A method for creating an impermeable layer in a borehole for removing obstacles generated in a drilled hole,
A positive electrode body is inserted into the hole, a negative electrode is the ground near the hole, the positive electrode body is moved to a desired position in the hole, and the clay-dissolved water containing clay mineral is added to the hole. While supplying into the hole, a direct current of a predetermined voltage is passed between the positive electrode body and the negative electrode from a DC power source, and the clay mineral particles are adhered to the surface of the positive electrode body. Thus, a water-impermeable layer in which the particles are aggregated is formed at a desired position in the vicinity of the failure occurrence location, so that the failure can be removed.

The impermeable layer creation method in the boring well of the present invention 9 is the present invention 8,
Another boring hole is excavated at a position adjacent to the hole, and the clay-dissolved water containing the clay mineral is supplied from the other boring hole.

The impermeable layer forming apparatus and the forming method in the borehole of the present invention are a simple apparatus and a simple method, and the impervious layer is formed only at a desired location in the vicinity of the site where the failure occurred at a predetermined depth position. It is possible to reliably carry out the work of removing.
In particular, during borehole renovation work or in boreholes where strainer pipes are already installed, it is necessary to create a water-impermeable layer at the desired position in the borehole and remove the obstacle that has occurred in the borehole. It can be the most suitable for implementation.

Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment in which an impermeable layer generating device in a borehole of the present invention is applied to a hot spring well, and FIG. 2 is a crack in the impermeable layer generating device in the borehole of the present invention. FIG. 3 is a cross-sectional view showing an embodiment applied to the bored well, and FIG. 3 is a view showing a form in which the impervious layer forming device in the borehole of the present invention is divided and removed in the embodiment applied to the hot spring well, FIG. 4 is a diagram showing a form in which an obstacle is divided and removed in an embodiment in which the impermeable layer generating device for a borehole of the present invention is applied to a borehole in which a crack has occurred in the formation.

  As shown in FIG. 1, the geological formation 10 in which the hot spring well (boring well) 1 is perforated has a lower underground hot water layer 12, which is a hot water layer in which hot water of an appropriate temperature flows through the hot spring, and lower than the lower underground hot water layer 12. There may be an upper underground warm water layer 11 that is a low temperature water layer through which low temperature water flows. In the hot spring well 1, hot water is pumped from the lower underground warm water layer 12, but the state of the geological formation, the underground warm water layer, etc. may change, and the upper underground warm water layer 11 and the hole 1a may be connected. In the hot spring well 1, when the hot water in the lower underground hot water layer 12 and the low temperature water in the upper underground hot water layer 11 are mixed, a pump (not shown) installed on the ground, in the hot spring well (boring well), etc. )) The hot water pumped in) will decrease in temperature. In such a case, it is necessary to prevent the warm water in the lower underground warm water layer 12 and the low temperature water in the upper underground warm water layer 11 from mixing. In this case, such an obstacle can be removed by applying the impervious water generating apparatus 30 of the present invention.

As shown in FIG. 1, the impermeable layer forming device 30 in the boring well 1 of the present invention includes a tube body 31, a first negative electrode 32, a second negative electrode 33, and a positive electrode 34 which are layer forming bodies. It has become. The layer forming body 31 may be in the form of a wire, a bar, or the like. That is, any positive electrode and negative electrode can be provided as long as they can be moved up and down or moved in the hole 1a.
A strainer pipe 20 or a casing is erected in the hole 1 a of the borehole 1. The strainer tube 20 is formed with slits, holes and the like at predetermined intervals on the outer periphery.

A tube body 31 is provided on the inner periphery of the strainer tube 20. A positive electrode 34 is provided on the tube body 31. Further, the tube body 31 includes a first negative electrode 32 at a position separated from the positive electrode 34 in the axial direction of the tube body 31 by a predetermined distance L (for example, 30 to 50 cm), that is, with the positive electrode 34 interposed therebetween. A second negative electrode 33 is provided. The positive electrode 34 and the negative electrodes 32 and 33 are configured by winding a copper wire or a copper plate around the tubular body 31. The positive electrode 34 and the negative electrodes 32 and 33 may be composed of other materials as long as the electrodes can be composed.
A DC power source 35 such as a battery or a battery is provided on the ground. The positive electrode 34 is connected to the positive electrode side of the DC power supply 35 by an electric wire 36. The first negative electrode 32 and the second negative electrode 33 are connected to the negative electrode side of the DC power supply 35 by an electric wire 37.

  The depth position of the upper underground warm water layer 11 which is a low temperature water layer is confirmed, and the positive electrode 34 provided on the tubular body 31 is moved to the depth position corresponding to the upper underground warm water layer 11. That is, the tubular body 31 is lowered. A weak current (for example, 1 to 2 mA) having a predetermined voltage (for example, 12 to 36 V) is passed between the positive electrode 34 and the negative electrodes 32 and 33 from the DC power supply 35. At this time, clay-dissolved water 15 in which a clay mineral (for example, sodium bentonite) is dissolved in a predetermined concentration (for example, 10% by weight) is supplied little by little into the hole 1a.

Sodium bentonite (hereinafter referred to as bentonite) is a clay mineral mainly composed of montmorillonite.
The sodium montmorillonite component in bentonite dissolved in water becomes colloidal in water and at the same time has a negative charge and is attracted by a positive electrolyte to cause gelation. In addition, when a positive electrode is placed in water, it is pulled by the positive electrode and adheres to the electrode portion in a clay form. That is, when the positive electrode 34 is placed in the clay solution 15 containing bentonite in the vicinity of the upper underground warm water layer 11 and a direct current is passed between the two electrodes, bentonite aggregates around the positive electrode 34. That is, since the negative electrodes 32 and 33 are arranged on both sides centering on the positive electrode 34 in the hole 1a of the hot spring well 1, the bentonite in the range of the negative electrodes 32 and 33 is aggregated around the positive electrode 34. Let As this process continues, the bentonite aggregates exceed the outer periphery of the strainer tube 20 and reach the hole 1a or the formation 10. That is, as shown in FIG. 1, the impermeable layer (blocking layer) 40a which block | closes the communication part of the upper underground warm water layer 11 and the hole 1a can be created.

According to FIG. 3, another embodiment in which a water-impermeable layer is formed so as to divide the location where the failure has occurred at a desired position near the location where the failure has occurred and the failure is removed will be described. In the description of this embodiment, the same parts as those in FIG. 1 are given the same numbers, and detailed descriptions thereof are omitted.
That is, in the embodiment shown in FIG. 3, the positive electrode 34 is positioned between the upper underground warm water layer 11 and the lower underground warm water layer 12 which are low temperature water layers, and the impermeable layer 40c is formed. By doing in this way, the part which wants to use as the hot spring well 1 and the occurrence part of a failure can be divided up and down, and the failure can be removed. According to this configuration, even if the impermeable layer 40c is formed in a fairly rough position, the obstacle can be removed. Further, as shown in FIG. 3, after the impermeable layer 40c is formed, a filler such as a cement solution is poured between the wall portion of the hole 1a in the upper portion of the impermeable layer 40c and the strainer tube 20 to fill the filled layer 60. It is good to form. By doing in this way, the trouble which arose in the boring well can be removed.

  In the borehole 1, a crack (crack) may occur in the surface (inner peripheral surface) portion of the hole 1 a. The fissure 50 of the formation 10 can also be closed by forming an impermeable layer with the impermeable layer forming device 30 of the boring well 1 of the present invention. Still another embodiment for closing the crack will be described with reference to FIG. In the description of this embodiment, the same reference numerals are assigned to the same parts as those in FIG. 1, and detailed description thereof is omitted.

  Check the depth position of the fissure 50. The positive electrode 34 is positioned at a depth position corresponding to the crack 50. That is, the tubular body 31 is lowered. The tubular body 31 is provided with a first negative electrode 32 and a second negative electrode 33 so as to sandwich the positive electrode 34. While supplying clay dissolved water 15 in which clay mineral (for example, sodium bentonite) is dissolved in a predetermined concentration (for example, 10% by weight) into the hole 1a little by little, a predetermined voltage (for example, 12 for example) is provided between both electrodes. A weak direct current (for example, 1 to 2 mA) of ~ 36V is applied. Then, bentonite aggregates around the positive electrode 34. That is, since the negative electrodes 32 and 33 are arranged on both sides centering on the positive electrode 34 in the hole 1a of the boring well 1, the bentonite in the range of the negative electrodes 32 and 33 is aggregated around the positive electrode 34. Let By repeating this process, the agglomerated bentonite exceeds the outer periphery of the strainer tube 20 and reaches the formation 10 near the fissure 50. That is, as shown in FIG. 2, an impermeable layer (blocking layer) 40 b that closes the portion of the crack 50 in the hole 1 a of the boring well 1 can be formed.

According to FIG. 4, a description will be given of still another embodiment in which an impermeable layer is formed at a desired position in the vicinity of a failure (crack) occurrence location so as to divide the failure occurrence location and remove the failure. In the description of this embodiment, the same parts as those in FIGS. 1 and 2 are assigned the same reference numerals and detailed description thereof is omitted.
That is, as shown in FIG. 4, the impermeable layer 40d may be formed by moving (lowering) the positive electrode 34 to a desired lower position in the vicinity of the location where the failure such as the crack 50 occurs. Accordingly, the failure can be removed by dividing the portion desired to be used as the boring well 1 and the location where the failure has occurred into a vertical direction. According to this configuration, even if the positive electrode 34 is lowered to a roughly rough position to form a water-impermeable layer, the obstacle can be removed if it can be divided. Also in this embodiment, as shown in FIG. 4, after the impermeable layer 40d is formed, a filler such as a cement solution is poured between the wall portion of the hole 1a above the impermeable layer 40d and the strainer tube 20 to fill. Layer 60 may be formed. By doing in this way, the trouble which arose in the boring well can be removed.

  In this way, it is possible to remove the obstacle and use it with the strainer tube 20 being provided. That is, the working time (period) of the work for removing the obstacle can be greatly shortened, and the removal cost can be reduced. In addition, the apparatus is simple and the work is also a simple method in which the positive electrode is moved (lowered) to a desired position in the vicinity of the depth position where the failure has occurred and a direct current of a predetermined voltage is applied from the direct current power source. Can now be implemented.

  As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that it is not limited to description of this embodiment. In the above description, the description is made on the assumption that the communication part between the crack and the borehole and the low temperature hot water layer is closed, but also when only a predetermined part (portion) of another borehole is closed or divided. It is possible to apply the present invention. Moreover, although the clay mineral is described with bentonite, other clay minerals may be used.

  Furthermore, although the explanation is made assuming that the positive electrode and the negative electrode are provided on the layer forming main body, an electrode body such as a positive electrode rod or an electrode plate is inserted into the hole of the boring well, and the ground surface in the vicinity of the hole is formed. Alternatively, a direct current may be applied with the ground as a negative electrode. In this case, the clay-dissolved water may be supplied from a borehole provided at a position adjacent to the borehole. By doing in this way, if there exists a site | part (part) in which the crack etc. generate | occur | produced or developed in the formation, bentonite can be obstruct | occluded by being pulled and adhering to the positive electrode body side.

  In addition, it goes without saying that various shapes and materials can be used without departing from the object and spirit of the present invention.

FIG. 1 is a cross-sectional view showing an embodiment in which an obstacle is directly removed in an embodiment in which the impermeable layer generating device for a borehole of the present invention is applied to a hot spring well. FIG. 2 is a cross-sectional view showing an embodiment in which the apparatus for forming an impermeable layer for a borehole of the present invention is applied to a hot spring well, in which a failure is divided and removed. FIG. 3 is a cross-sectional view showing an embodiment in which an obstacle is directly removed in an embodiment in which the impermeable layer generating apparatus for a borehole of the present invention is applied to a borehole having a crack. FIG. 4 is a cross-sectional view showing a form in which a failure is divided and removed in an embodiment in which a method for forming an impermeable layer of another borehole of the present invention is applied to a borehole in which a crack has occurred.

Explanation of symbols

1 ... Boring well (onsen well)
DESCRIPTION OF SYMBOLS 10 ... Geologic formation 11 ... Upper underground warm water layer 12 ... Lower underground warm water layer 15 ... Clay melt water 20 ... Strainer pipe | tube 30 ... Impermeable layer formation apparatus 31 ... Layer formation main body (tube body)
32 ... 1st negative electrode 33 ... 2nd negative electrode 34 ... Positive electrode 35 ... DC power supply 40a, 40b, 40c, 40d ... Impermeable layer 50 ... Crack

Claims (9)

An impermeable layer generating device in a boring well (1) for removing obstacles generated in an excavated hole (1a),
A layer forming body (31) inserted into the hole (1a);
A positive electrode (34) provided on the layer forming body (31);
A negative electrode (32, 33) provided at a position spaced apart from the positive electrode (34) by a predetermined distance in the insertion direction of the layer forming main body (31) on the layer forming main body (31);
A DC power source (35) for passing a DC current of a predetermined voltage between the positive electrode (34) and the negative electrode (32, 33);
The positive electrode (34) is moved to a desired position in the vicinity of the failure occurrence location, and the clay dissolved water (15) containing clay mineral is supplied into the hole (1a) from the DC power supply (35). A direct current is passed between the positive electrode (34) and the negative electrode (32, 33), and the clay mineral particles are adhered to the surface of the positive electrode (34), thereby the vicinity of the failure occurrence point. An impervious layer forming apparatus in a boring well, wherein the impervious layer in which the particles are aggregated is formed at a desired position so that the obstacle can be removed. An impermeable layer generating device in a borehole (1) according to claim 1,
The boring well (1) is provided with a strainer pipe (20) in the hole (1a),
The said layer formation main body (31) is inserted in the inner peripheral part of the said strainer pipe | tube (20). The impermeable layer formation apparatus in a boring well characterized by the above-mentioned. An impervious layer forming device in a boring well according to claim 1 or 2,
The negative electrode (32, 33) is provided at a plurality of positions in the insertion direction of the layer forming body (31) so as to sandwich the positive electrode (34). Layer creation device. A method for creating an impermeable layer in a borehole for removing obstacles generated in a drilled hole,
Inserting the layer forming body provided with a positive electrode and a negative electrode into the hole at a position separated by a predetermined distance in the insertion direction of the layer forming body into the hole;
Position the positive electrode at a desired position in the vicinity of the failure occurrence point,
While supplying clay-dissolved water containing clay minerals in the holes, between the positive electrode and the negative electrode, a direct current of a predetermined voltage is passed from a direct current power source,
By imposing the clay mineral particles on the surface of the positive electrode, an impermeable layer is formed at a desired position in the vicinity of the failure occurrence point,
An impervious layer forming method in a boring well, wherein the obstacle can be removed. A method for forming an impermeable layer in a boring well according to claim 4,
The boring well is provided with a strainer pipe in the hole,
The layer forming main body is inserted into an inner peripheral portion of the strainer pipe. A method for forming an impermeable layer in a boring well according to claim 4 or 5,
The water-impermeable layer in the boring well, wherein the water-impermeable layer is formed at a position where the bored well can be separated from a location where the failure has occurred and a location where the failure has not occurred. Layer construction method. A method for forming an impermeable layer in a boring well according to claim 4 or 5,
The layer-forming main body is provided with the negative electrode at a plurality of positions in the insertion direction of the layer-forming main body so as to sandwich the positive electrode. Method. A method for creating an impermeable layer in a borehole for removing obstacles generated in a drilled hole,
Insert a positive electrode body into the hole,
Let the negative electrode be the ground near the hole,
Moving the positive electrode body to a desired position in the hole;
While supplying clay-dissolved water containing clay minerals into the hole, a DC current of a predetermined voltage is passed between the positive electrode body and the negative electrode from a DC power source,
By forming particles of the clay mineral on the surface of the positive electrode body to form a water-impermeable layer in which the particles are aggregated at a desired position in the vicinity of the failure occurrence point,
A method for forming an impermeable layer in a boring well, wherein the obstacle can be removed. A method for forming an impermeable layer in a boring well according to claim 8,
A method for forming an impermeable layer in a boring well, wherein another boring hole is excavated at a position adjacent to the hole, and clay-dissolved water containing the clay mineral is supplied from the other boring hole.

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