JP2009058302A - Device for testing fluid in cracks - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To grasp the state of fluid circulating in cracks of a base rock continuously on the site. <P>SOLUTION: A fluorescent tracer is injected into a portion of a port block 24 sealed with a packer 8 of an upstream side device, and fluid including the fluorescent tracer is circulated into the cracks 1, and is allowed to flow into the portion of the port block 24 sealed with a packer 8 of a downstream side device 5. Then, the fluid is lifted through a flow block 33 of the downstream side device 5, and hit by light from an LED to thereby emit light from the fluorescent tracer, and arrival of the fluorescent tracer is detected on the site by an optical fiber 35, and the circulation state of the fluorescent tracer is evaluated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-crack fluid testing apparatus for detecting the state of fluid flowing through a crack such as a rock mass (flow velocity, etc.).

  In a waste disposal facility that disposes of industrial waste, etc., the surrounding area is covered with artificial barrier materials such as cement and highly water-resistant sheets so that the hazardous materials of the waste are not dissolved by preventing the flow of groundwater. The structure is surrounded. In particular, nuclear fuel-related waste contains many radionuclides that have high radioactivity levels and continue to have radioactivity for a long period of time.

  For this reason, the radioactive waste is subjected to a process (geological disposal) in which it is buried in a stable geological formation in the deep underground. In geological disposal of radioactive waste, safety is ensured by the artificial barrier material around the waste and the natural barrier of the rock. That is, the release of the nuclide to the natural barrier is suppressed by the artificial barrier, and the transfer of the nuclide to the biosphere is delayed by the natural barrier.

  In the treatment of radioactive waste, it has been proposed to construct a geological treatment facility in consideration of various situations such as the location where the flow of groundwater in the bedrock is slow, the shape of the treatment facility, the distance to the biosphere, etc. ( For example, see Patent Document 1). In addition, it has been proposed to monitor the situation in which a specific substance moves due to infiltration of groundwater flow or rainwater into the ground, and evaluate the influence on the environment in a geological treatment facility (see, for example, Patent Document 2).

  It is important to keep radioactive wastes in natural barriers for a very long time, and assessing the status of groundwater migration has a major impact on the safety assessment of geological disposal of radioactive waste. In order to perform such a safety evaluation, a safety evaluation method has been proposed that can ensure objective coverage and appropriately handle objective information (see, for example, Patent Document 3).

  It is important to understand the movement situation of groundwater (especially the movement speed) for each site in order to evaluate the migration characteristics of adsorptive substances such as radionuclides and to accurately construct the geological treatment facility. is there. Moreover, it becomes possible to carry out safety evaluation of underground treatment facilities with high reliability. As a technique for grasping the groundwater transfer status, the groundwater flowing through the rock crack is sampled, and the movement speed of the groundwater is evaluated based on the sampled groundwater status (for example, the status of the tracer).

  However, when sampling the groundwater flowing through the cracks, there was a time lag until the situation was grasped, and it was not possible to grasp the transient state or continuous change of the moving speed. For this reason, it is the present situation that the advent of a technology capable of continuously grasping the groundwater flowing through the cracks in real time is desired.

JP 2006-250600 A JP 2002-328065 A JP 2003-139894 A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an in-crack fluid testing apparatus capable of continuously and in-situ grasping the state of fluid flowing through a crack in a rock mass. .

  In order to achieve the above object, an in-crack fluid testing apparatus according to claim 1 of the present invention is fitted into two excavation holes penetrating a crack, injecting a fluorescent tracer into the fluid upstream of the crack, and An in-crack fluid test device that detects the flow state of the fluid in the crack by detecting the fluorescent state of the fluid on the downstream side, the upstream device inserted in the excavation hole upstream of the crack, It consists of a downstream device inserted into the downstream excavation hole. The upstream device includes a packer that seals the cracked portion, an upstream space that is sealed by the packer and communicates with the crack, and fluorescent light in the upstream space. And a tracer injection means for injecting the tracer. The downstream device includes a packer for sealing the cracked portion, a downstream space sealed by the packer and communicating with the crack, and the inflowed fluorescence that has flowed into the downstream space. Fluid containing tracer A light source directing light, characterized in that the detecting means for detecting a light emission condition of the fluid in the downstream space is provided.

  In the present invention according to claim 1, the fluorescent tracer is injected from the tracer injection means into the upstream space of the upstream device, and the fluid containing the fluorescent tracer is circulated through the crack. The fluid including the fluorescent tracer that has circulated through the crack flows into the downstream space of the downstream device, is irradiated with light from the light source, and the light emission state is detected at a site in the downstream space by the detection means. Thereby, by evaluating the situation from the start of injection of the fluorescent tracer to the light emission, the situation of the fluid flowing through the crack of the rock mass, for example, the velocity of the fluid can be grasped continuously and on the spot.

  According to a second aspect of the present invention, there is provided the in-crack fluid testing apparatus according to the first aspect of the present invention. The in-crack fluid testing apparatus according to the first aspect, the discharge means for discharging the fluid in the downstream space of the downstream device to the outside, The information of the detection means is input, and the situation analysis means for analyzing the light emission situation is provided.

  In the present invention according to claim 2, the fluid containing the fluorescent tracer can be continuously circulated over a long period of time by discharging the fluid in the downstream space to the outside by the discharging means, and the situation based on the information of the detecting means The analyzing means can continuously analyze the light emission state of the fluid.

  Further, in the in-crack fluid test apparatus according to claim 2, the discharge device of the downstream apparatus extends from the downstream space along the axial direction of the drilling hole. The light source of the downstream device is a light emitting diode that shines light in a direction orthogonal to the discharge tube, and the detection means of the downstream device is in the discharge tube of the part that is irradiated with light by the light emitting diode. It comprises a prism that reflects the emitted light in a direction along the axial direction of the discharge tube, and an optical fiber that detects the light reflected by the prism from the axial direction of the discharge tube.

  In the present invention according to claim 3, light is applied to the fluid flowing through the discharge pipe extending along the axial direction of the excavation hole from the direction orthogonal to the flow direction, and the fluid in the discharge pipe at the portion where the light is applied is reflected by the prism. Because it is polarized and detected by an optical fiber, the optical fiber can be placed in a straight line to detect the state of light emission, and the state of the fluid at the crack site is detected in situ with the diameter of the drilling hole kept to a minimum be able to.

  According to a fourth aspect of the present invention, there is provided the in-crack fluid test apparatus according to the third aspect of the present invention, wherein the situation analysis means measures the intensity of the light energy from the optical fiber by measuring the intensity of the light from the optical fiber. It is a means for detecting the concentration and deriving the time of the fluid flowing through the crack from the upstream device to the downstream device based on the concentration of the fluorescent tracer.

  In the present invention according to claim 4, the density of light energy is measured based on the light emission information detected by the optical fiber, and the time of the fluid flowing through the crack from the upstream device to the downstream device is determined based on the concentration of the fluorescent tracer. To grasp.

  The in-crack fluid test apparatus of the present invention can grasp the state of the fluid flowing through the crack of the rock mass continuously and on the spot.

  FIG. 1 shows an overall configuration of an in-crack fluid testing apparatus according to an embodiment of the present invention, FIG. 2 shows a cross section of the entire downstream apparatus (upstream apparatus), and FIG. 4 shows the overall state of the downstream device (upstream device), FIG. 4 shows the details of the fluorescence concentration detector in FIG. 2, FIG. 5 shows the VV line in FIG. 4, and FIG. The VI-VI line arrow in 4 is shown.

  As shown in FIG. 1, excavation holes 2 and 3 penetrating the crack 1 of the rock are formed, and an upstream device 4 is inserted into the excavation hole 2 and a downstream device 5 is inserted into the excavation hole 3. Yes. The flow of fluid (water) in the crack 1 is such that the excavation hole 2 side is upstream and the excavation hole 3 side is downstream (flow from the right side to the left side in the figure). A fluorescent tracer is injected from the upstream device 4 into the crack 1 site, and the water containing the fluorescent tracer that has passed through the crack 1 is detected by the downstream device 5 at the crack 1 site.

  In the present embodiment, the upstream device 4 and the downstream device 5 have the same configuration, and the upstream device 4 is connected to an out-of-hole device 6 for injecting the fluorescent tracer, and the downstream device 5 is connected to the fluorescent tracer. An out-of-hole device 7 is connected to collect water containing water and to input the light emission status of the crack 1 site to derive the concentration of the fluorescent tracer. Further, the upstream device 4 and the downstream device 5 are provided with a packer 8 for sealing the site of the crack 1, and in order to maintain the expanded diameter of the packer 8, an inert gas (nitrogen gas) is supplied from the out-of-hole devices 6 and 7. ) Is supplied.

  That is, the out-of-hole device 6 connected to the upstream side device 4 is provided with a water tank 11 and a fluorescent tracer tank 12, and the fluorescent tracer and water are pumped to the upstream side device 4 by the pumps 13 and 14 (tracer injection). means). Further, the upstream apparatus 4 and the downstream apparatus 5 are provided with a nitrogen cylinder 19, and nitrogen is sent to maintain the diameter expansion of the packer 8. The out-of-hole device 7 connected to the downstream side device 5 is provided with a pumping pump 15 that pumps up water containing the fluorescent tracer, and a recovery tank 16 that collects the fluid pumped up by the pumping pump 15.

  Further, a fluorometer 17 is provided to which the light emission status of the fluid detected by the downstream device 5 is input, and the data of the fluorometer 17 is sent to a control device 18 as a status analysis means to derive the concentration of the fluorescence tracer. The

  The concentration of the fluorescent tracer on the downstream device 5 side is analyzed by the control device 18, and for example, the velocity, flow rate, etc., of the fluid flowing through the crack 1 are derived depending on the concentration change time after the fluorescent tracer is injected. Operation control of injection of the fluorescent tracer, that is, drive control of the pumps 13 and 14, pumping control of water including the fluorescent tracer, that is, drive control of the pumping pump 15, supply control of nitrogen gas for maintaining the diameter expansion of the packer 8 Are integrated and managed by the control device 18.

  Although explanation is omitted, it is also possible to detect the pressure, temperature, component and the like of the fluid flowing through the crack 1 and analyze the physical properties of the fluid and the movement status of the substance contained in the fluid by the control device 18.

  Specific configurations of the upstream device 4 and the downstream device 5 will be described with reference to FIGS. Since the upstream device 4 and the downstream device 5 have the same configuration, the following description is given as the downstream device 5.

  The entire downstream apparatus 5 will be described with reference to FIGS.

  As shown in FIG. 2, a lower packer pipe 22 is provided at the tip of the downstream side device 5 (lower end in the figure: bottom side of the excavation hole 3 shown in FIG. 3 described later), and the lower end of the lower packer pipe 22 is It is closed with an end cap 23. A port block 24 that is hollow and has a larger diameter than the lower packer pipe 22 is attached to the upper end of the lower packer pipe 22. The port block 24 is formed by, for example, machining of stainless steel and is coated with fluorine.

  An upper packer pipe 25 is attached to the upper part of the port block 24 (on the opposite side of the lower packer pipe 22 across the port block 24), and the diameter of the upper packer pipe 25 is the same as that of the lower packer pipe 22.

  A cylindrical packer 8 is disposed on the outer periphery of the lower packer pipe 22, and a gap is formed between the inner peripheral surface of the packer 8 and the outer peripheral surface of the lower packer pipe 22. The lower end portion of the packer 8 is attached to the lower end side of the lower packer pipe 22 via the slide block 26, and the lower end portion of the packer 8 is movable in the axial direction with respect to the lower packer pipe 22. The upper end portion of the packer 8 is fixed to the upper end side of the lower packer pipe 22.

  The packer 8 is disposed on the outer periphery of the upper packer pipe 25, and a gap is formed between the inner peripheral surface of the packer 8 and the outer peripheral surface of the upper packer pipe 25. It is fixed to the outer peripheral surface of the end. The outer diameter of the packer 8 and the outer diameter of the port block 24 are the same.

  In addition, a gas pipe 27 for introducing nitrogen gas is provided between the outer periphery of the lower packer pipe 22 and the cylindrical packer 8, and the gas pipe 27 is arranged through the inside of the upper packer pipe 25 and the port block 24. . Further, as shown in FIG. 3, a gas pipe 28 for introducing nitrogen gas is provided between the outer periphery of the upper packer pipe 25 and the cylindrical packer 8.

  As shown in FIG. 3, an excavation hole 3 is provided through the crack 1 in the rock. Nitrogen gas is supplied from the gas pipes 27, 28, the packer 8 is expanded, and the downstream device 5 is fitted in the excavation hole 3. Thereby, the part of the crack 1 is sealed by the packer 8, and the crack 1 is formed in the gap (downstream space: upstream space in the case of the upstream device 4) between the wall surface of the excavation hole 3 and the outer periphery of the port block 24. The fluid that circulates is designed to flow.

  The outer packer 8 on the outer periphery of the lower packer pipe 22 has a lower end portion that is movable in the axial direction with respect to the lower packer pipe 22, an upper end portion fixed to the upper end side of the lower packer pipe 22, and Both end portions of the packer 8 are fixed to the outer peripheral surface of the end portion of the upper packer pipe 25.

  For this reason, the member of a connection location with the port block 24 can be simplified, a dead space can be eliminated, and the flow of the fluid with respect to a slight clearance can be kept uniform. And since the lower end part of the packer 8 on the lower packer pipe 22 side is slidable, the downstream device 5 can be installed near the center of the excavation hole 3 regardless of the direction of the excavation hole 3, It is possible to suppress the packer 8 from being caught on the port block 24 side during insertion and removal.

  On the other hand, as shown in FIG. 2, an injection pipe 31 connected to the port block 24 is provided. In the case of the downstream device 5, the injection pipe 31 may not be provided. In the case of the upstream device 4, the injection pipe 31 is connected to the fluorescent tracer tank 12 (see FIG. 1), and the fluorescent tracer is injected into the gap between the wall surface of the excavation hole 3 and the outer periphery of the port block 24 (tracer injection). means).

  Further, a pumping pipe 32 for pumping fluid from a gap between the wall surface of the excavation hole 3 and the outer periphery of the port block 24 is provided, and the pumping pipe 32 is connected to the recovery tank 16 via the pumping pump 15 (see FIG. 1). Connected (discharge means). The pumping pipe 32 is provided with a flow block 33 through which a fluid flows. The flow block 33 includes a light source (light emitting diode: LED) 34 that applies light to the fluid including a fluorescent tracer, and an optical fiber 35 that detects the light emission state of the fluid. And are provided.

  The flow block 33 will be described in detail with reference to FIGS.

  As shown in the drawing, an LED 34 is attached to a main body 36 (discharge pipe) of the flow block 33, and light is applied to a fluid (fluid flowing into the downstream space) including a fluorescent tracer flowing through the main body 36. Light is applied from a direction orthogonal to the fluid flow (a direction orthogonal to the discharge pipe).

  In addition, the main body 36 of the flow block 33 is provided with a prism 37, and the prism 37 allows light emitted from the inside of the main body 36 to be irradiated by the LED 34 in a direction along the axial direction of the main body 36, that is, 4 and FIG. 5, the light is reflected in the left direction. The tip of an optical fiber 35 is connected to the prism 37, and the optical fiber 35 transmits light reflected by the prism 37 (light emitted from the fluorescent tracer to emit light) in the axial direction of the flow block 33, that is, the axis of the borehole 3. It detects from the direction. The optical fiber 35 is connected to the fluorometer 17.

  In the downstream device 5 described above, light emitted from the inside of the main body 36 of the portion irradiated with the LED 34 is reflected by the prism 37 and emitted by the optical fiber 35 arranged along the longitudinal direction of the downstream device 5. Detected light. The light detected by the optical fiber 35 is sent to the fluorometer 17, and the concentration of the fluorescent tracer is derived by the control device 18 based on the light condition.

  Although it is necessary to detect light from a direction orthogonal to the flow of the fluid, the optical fiber 35 can be arranged without bending by providing the prism 37. Since the optical fiber 35 is made of glass, a large curvature is required for bending, and the downstream apparatus 5 becomes large. However, the downstream apparatus is provided with a prism 37 and the optical fiber 35 is linearly arranged. The size of the radial direction of 5 can be suppressed to the minimum, and it becomes possible to correspond to the drilling hole 3 having a small diameter.

  In the embodiment described above, water and a fluorescent tracer are supplied from the water tank 11 and the fluorescent tracer tank 12 to the site of the crack 1 sealed by the packer 8 of the upstream apparatus 4 and sealed by the packer 8 of the downstream apparatus 5. The water containing the fluorescent tracer is pumped from the stopped crack 1 site, but considering the balance between supply and pumping, etc., the fluorescent tracer is sealed in the crack 1 site sealed by the packer 8 of the downstream device 5. A circulation system for circulating the recovered fluid and the like in a state that does not affect the concentration of the liquid is constructed.

  In the above-described embodiment, the upstream device 4 and the downstream device 5 have the same configuration. For this reason, the pumping pipe 32 of the upstream device 4 is connected to the recovery tank 16 (pumping pump 15) via a switching valve or the like, and the optical fiber 35 of the flow block 33 is connected to the fluorometer 17. Further, the injection pipe 31 of the downstream device 5 is connected to the water tank 11 and the fluorescent tracer tank 12 through a switching valve or the like. When the state of the fluid flowing through the crack 1 changes, the upstream device 4 is used for pumping water on the downstream side by operating a switching valve or the like, and the downstream device 5 is used for water injection on the upstream side. It has become.

  The upstream device 4 includes only the injection pipe 31, and the downstream device 5 includes only the pumping pipe 32 and the flow block 33, and the upstream device 4 and the downstream device 5 can each be dedicated devices. It is. If the flow direction of the fluid in the crack 1 is fixed, it can be set as the fluid test apparatus in a crack of a simple structure.

  The operation of the in-crack fluid testing apparatus having the above configuration will be described.

  With the diameter of the packer 8 expanded, the upstream device 4 and the downstream device 5 are fitted into the excavation holes 2 and 3, the part of the port block 24 and the part of the crack 1 are matched, and the crack 1 of the excavation holes 2 and 3 The part is sealed. Water including a fluorescent tracer is supplied from the injection pipe 31 to the position of the port block 24 of the upstream apparatus 4. The water containing the fluorescent tracer flows through the crack 1 together with the fluid of the crack 1 and reaches the position of the port block 24 of the downstream apparatus 5. In the downstream device 5, the fluid at the sealed crack 1 is pumped from the pumping pipe 32 to the recovery tank 16. The pumped fluid is illuminated by the LED 34 when passing through the flow block 33.

  As time passes, the water containing the fluorescent tracer flows through the crack 1 and reaches the position of the downstream device 5. When light from the LED 34 is applied to the fluorescent tracer in the flow block 33, the fluorescent tracer emits light, and light in a state corresponding to the concentration of the fluorescent tracer is reflected by the prism 37 and detected on the spot by the optical fiber 35. For this reason, the movement status of the fluorescent tracer can be detected on the spot.

  The light detected by the optical fiber 35 is input to the fluorometer 17 and sent to the control device 18, and the state (speed, etc.) of the fluid flowing through the crack 1 is grasped according to the time until arrival. For example, by applying a non-sorbing fluorescent tracer, sorption of the fluorescent tracer to the apparatus is suppressed, and light emission detection in the downstream apparatus 5 from the start of supply of the fluorescent tracer to the upstream apparatus 4 The speed of the fluid flowing through the crack 1 can be grasped by the time until. As a result, it is possible to grasp the state of the fluid flowing through the crack 1 (velocity and migration characteristics of contained substances) on the spot.

  Further, since the fluid of the downstream device 5 at the sealed crack 1 is pumped from the pumping pipe 32 to the recovery tank 16, the fluid containing the fluorescent tracer can be continuously circulated for a long period of time. Based on the information of the optical fiber 35, the control device 18 can continuously grasp the light emission state of the fluid. The control device 18 stores, for example, parameters such as water permeability of the crack 1 that is the object of the rock, so that the movement state of the fluorescent tracer can be grasped in accordance with the actual movement state of the fluid.

  In the above-described fluid-in-crack testing apparatus, the light reflected by the prism 37 is detected from the axial direction of the excavation hole 3 by the optical fiber 35 disposed in the longitudinal direction of the downstream apparatus 5. The fluorescent tracer is injected into the portion of the port block 24 sealed by the packer 8 of the upstream device 4, and the fluid containing the fluorescent tracer is circulated through the crack 1 so that the downstream device 5 is installed. Is flown into the portion of the port block 24 sealed by the packer 8 of the water, pumped through the flow block 33 of the downstream side device 5, and irradiated with light by the LED 34 to cause the fluorescent tracer to emit light, and the arrival of the fluorescent tracer on the spot It can detect with the optical fiber 35 and can evaluate the distribution | circulation condition of a fluorescent tracer. For this reason, it becomes possible to grasp | ascertain the condition of the fluid which distribute | circulates the crack 1, for example, the speed of the fluid continuously and on the spot.

  Since the groundwater flowing through the crack 1 of the rock mass can be grasped continuously in real time, it is possible to reliably grasp the transient state and continuous change of the moving speed, for example, the migration characteristics of the adsorbents such as radionuclides Therefore, it is possible to accurately construct the geological treatment facility and to evaluate the safety of the underground treatment facility with high reliability.

  INDUSTRIAL APPLICATION This invention can be utilized in the industrial field | area of the fluid test apparatus in a crack for detecting the conditions (flow velocity etc.) of the fluid which flows through the cracks, such as a rock.

1 is an overall configuration diagram of an in-crack fluid testing apparatus according to an embodiment of the present invention. It is sectional drawing showing the whole downstream apparatus (upstream apparatus). It is a general view of the downstream apparatus (upstream apparatus) of the state fitted to the excavation hole. FIG. 3 is a detailed view of a fluorescence concentration detection unit in FIG. 2. It is the VV arrow directional view in FIG. It is a VI-VI line arrow view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crack 2, 3 Excavation hole 4 Upstream apparatus 5 Downstream apparatus 6, 7 Out-hole apparatus 8 Packer 11 Water tank 12 Fluorescent tracer tank 13, 14 Pump 15 Pumping pump 16 Collection tank 17 Fluorometer 18 Control apparatus 19 Nitrogen cylinder 22 Lower packer pipe 23 End cap 24 Port block 25 Upper packer pipe 26 Slide block 27, 28 Gas pipe 31 Injection pipe 32 Pumping pipe 33 Flow block 34 Light source (LED)
35 Optical fiber 36 Body 37 Prism

Claims (4)

It is inserted into two excavation holes that penetrate the crack, and a fluorescent tracer is injected into the fluid on the upstream side of the crack and the flow state of the fluid in the crack is detected by detecting the fluorescent state of the fluid on the downstream side of the crack. An in-crack fluid testing device,
It consists of an upstream device fitted in the excavation hole upstream of the crack and a downstream device fitted in the excavation hole downstream of the crack,
The upstream device is provided with a packer that seals the site of the crack, an upstream space that is sealed by the packer and communicates with the crack, and a tracer injection means that injects the fluorescent tracer into the upstream space,
The downstream device includes a packer that seals the cracked portion, a downstream space that is sealed by the packer and communicates with the crack, a light source that applies light to a fluid including a fluorescent tracer that has flowed into the downstream space, An in-crack fluid testing apparatus, comprising: a detecting means for detecting a light emission state of the fluid. The in-crack fluid testing device according to claim 1,
Discharging means for discharging the fluid in the downstream space of the downstream device to the outside;
An in-crack fluid testing apparatus characterized by comprising status analysis means for receiving information on detection means of the downstream side apparatus and analyzing the light emission status. The in-crack fluid testing device according to claim 2,
The discharge means of the downstream device is a discharge pipe extending from the downstream space along the axial direction of the excavation hole,
The light source of the downstream device is a light emitting diode that shines light in a direction perpendicular to the discharge tube,
The detection means of the downstream device includes a prism that reflects light emitted in the discharge pipe at a portion irradiated with light from the light emitting diode in a direction along the axial direction of the discharge pipe, and a light reflected by the prism. An in-crack fluid testing device comprising: an optical fiber that detects from the axial direction of the optical fiber. In the in-crack fluid test apparatus according to claim 3,
The situation analysis means detects the concentration of the fluorescent tracer by measuring the density of light energy from the optical fiber, and derives the time of the fluid flowing through the crack from the upstream device to the downstream device based on the concentration of the fluorescent tracer An in-crack fluid testing apparatus characterized by comprising: