Water stop device and system for underground water layered monitoring

Abstract

The utility model discloses a water stopping device and system for underground water layered monitoring, the water stopping device comprises a base body column and a water swelling rubber layer, and the water swelling rubber layer is arranged on the side surface of the base body column; the guide rings are arranged on the upper side and the lower side of the base body column and used for limiting the water swelling rubber layer; and the hollow pipe penetrates through the base body column and the guide ring. The defects that current single-hole layered monitoring work is mostly achieved through variable-diameter hole-forming construction or water stop plugs, but the variable-diameter hole-forming construction or the water stop plugs are large in occupied area, high in manufacturing cost, limited in monitored target layer and incapable of or not suitable for long-time water stop are overcome. The water swelling rubber layer containing the sodium polyacrylate super absorbent resin is adopted as a water stop material, the monitoring probe is lowered to a water-resisting layer between different water-bearing layers in cooperation with the connecting rod, and permanent monitoring of the multi-target water-bearing layer is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of groundwater monitoring, and more specifically to a water-stopping device and a system for groundwater stratification monitoring. Background Art

[0002] Groundwater stratified monitoring refers to drilling only one borehole in the target monitoring area. Through stratification technology, multiple target monitoring layers distributed in the borehole are effectively separated step by step to meet the purpose of stratified monitoring.

[0003] There are two mainstream aquifer isolation technologies: one is achieved by cement plugging and borehole diameter reduction during the drilling of the monitoring well: when the monitoring hole is first drilled, the hole is generally larger to meet the subsequent diameter reduction needs. According to the core, when drilling to the position where the aquiclude or aquifer needs to be segmented, the drilling work is stopped, cement is poured into the bottom of the borehole, and the diameter is continued after the cement is completely solidified and the casing is lowered. The segmentation of multiple aquifers can be achieved by analogy. The monitoring probe is lowered into the corresponding aquifer casing to complete the monitoring of different aquifers. This method can meet the long-term monitoring of multiple aquifers in the monitoring well, but this method requires a large construction site, a long construction period, and more consumables.

[0004] Another isolation method does not require the monitoring well to be variable in diameter. A pump-type packer (plug) is lowered to the location where the aquifer or aquifer needs to be segmented, and then the rubber part of the packer (plug) is expanded by inflating the packer with air or water. The expanded rubber is in full contact with the hole wall to achieve the purpose of blocking the aquifer. This method is generally used for temporary water stopping, but special pressure vessels are required for long-term monitoring, which is costly.

[0005] In addition, there are some other attempts, such as making a lotus-shaped pipe that is extruded once, and achieving the purpose of layered monitoring by filling filter materials and clay balls in sections. However, these methods have the disadvantages of customized pipes, single applicable scenarios, and insufficient contact between the pipe and the hole wall.

[0006] Currently, single-hole stratified monitoring is mostly achieved with the help of variable-diameter drilling construction or water-stopping plugs, but they have the disadvantages of large site occupation, high cost, limited monitoring target layers, and inability or unsuitability for long-term water stopping. Utility Model Content

[0007] The purpose of the utility model is to provide a water stopping device and system for groundwater stratification monitoring, in order to solve the technical problems in the background technology.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] One of the purposes of the utility model is to provide a water-stopping device for groundwater stratification monitoring, comprising: a base column and

[0010] a water-swellable rubber layer, the water-swellable rubber layer being arranged on a side surface of the base column;

[0011] Guide rings, which are arranged on the upper and lower sides of the base column and are used to limit the water-swellable rubber layer;

[0012] A hollow tube is provided passing through the base column and the guide ring.

[0013] In some embodiments, the inner diameter of the guide ring is the same as the diameter of the base column to which the water-swellable rubber layer is attached.

[0014] In some embodiments, the water-swellable rubber layer is evenly distributed on the side surface of the base column.

[0015] In some embodiments, the diameter of the base column to which the water-swellable rubber layer is attached is 8 to 10 mm smaller than the inner diameter of the monitoring hole.

[0016] In some embodiments, there are multiple hollow tubes, and the multiple hollow tubes are independently arranged to penetrate the base column and the guide ring.

[0017] In some embodiments, a connecting pipe is also included. A plurality of the connecting pipes are connected in sequence to connect the hollow pipe to the wellhead of the monitoring hole to prevent the water-swellable rubber layer from sliding downward before it is in full contact with the hole wall of the monitoring hole.

[0018] The second purpose of the utility model is to provide a groundwater stratification monitoring system, including any of the water-stopping devices and monitoring probes, wherein the water-stopping device is arranged at a preset depth position of the monitoring hole through a plurality of connecting pipes, and the monitoring probe reaches a predetermined waterproof layer through a plurality of connecting pipes and hollow pipes in turn to realize monitoring.

[0019] The third object of the utility model is that the present embodiment also provides a groundwater stratification monitoring method, which is implemented based on the system and includes the following steps:

[0020] Step 1: Arrange the water stop device at a preset depth position of the monitoring hole through a plurality of connecting pipes;

[0021] Step 2: When the water-swellable rubber layer of the water-stopping device is completely expanded and contacts the hole wall of the monitoring hole, the water-bearing layer of the monitoring hole is divided into at least two layers;

[0022] Step 3: Pass the monitoring probe through multiple connecting pipes and hollow pipes in sequence to reach the predetermined aquifer to achieve stratified monitoring.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] After the water-stop device of the utility model is expanded, it can produce an effective water-isolating effect on the upper and lower aquifers of the monitoring hole in the next 5-7 years. Then, the probe is lowered to different aquifers, and the monitoring data is sent with the help of a wireless transmission device (RTU), so as to achieve the purpose of fully automatic long-term monitoring of different aquifer parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional top view schematic diagram of the water-stop device of the utility model, wherein a is a single-tube water-stop device of 75mm well specification; b is a single-tube water-stop device of 95mm well specification; and c is a double-tube water-stop device of 95mm well specification.

[0026] Figure 2 It is a schematic diagram of the main view of the water-stopping device of the utility model, wherein a is a single-tube water-stopping device of 75mm well specification; b is a single-tube water-stopping device of 95mm well specification; and c is a double-tube water-stopping device of 95mm well specification.

[0027] Figure 3 This is a schematic diagram of the groundwater stratification monitoring system;

[0028] Illustration: 1-hollow tube, 2-base column, 3-water-swelling rubber layer, 4-guide ring, 5-cable, 6-monitoring probe, 7-connecting pipe, 8-water-stop device located at the upper layer, 9-water-stop device located at the lower layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0030] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0034] The following will be combined Figure 1-3 , a permanent water stopping device and a monitoring method for groundwater stratification monitoring involved in the embodiments of the present application are described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0035] Embodiment 1:

[0036] See also Figure 1-3 As shown, a water-stopping device for groundwater stratification monitoring includes: a base column 2 and a water-swellable rubber layer 3, a guide ring 4, and a hollow tube 1. The water-swellable rubber layer 3 is arranged on the side surface of the base column 2; the guide ring 4 is arranged on the upper and lower sides of the base column 2 to limit the water-swellable rubber layer 3; the hollow tube 1 is set through the base column 2 and the guide ring 4.

[0037] Through the above structure, it is possible to provide support for the water-swellable rubber layer 3 at a predetermined position underwater, so that the water-swellable rubber layer 3 swells when exposed to water and completely fits with the hole wall in the monitoring hole, thereby separating the water layer in the monitoring hole from top to bottom. The monitoring probe 6 for monitoring the water layer can be introduced from the hollow tube 1, because the upper part of the hollow tube 1 is connected to the mouth of the monitoring hole through the connecting tube 7, so there is no water mixing in the aquifer.

[0038] In order to ensure that the water-swellable rubber layer 3 can completely fit the wall of the monitoring hole after swelling when exposed to water, the embodiment of the present application makes the diameter of the base column 2 to which the water-swellable rubber layer 3 is attached smaller than the diameter of the base column 2 to which the water-swellable rubber layer 3 is attached, for example, 8mm to 10mm smaller, so that it can be easier to be assembled at the predetermined position of the monitoring hole.

[0039] In order to ensure that the water-swellable rubber layer 3 can completely fit with the hole wall of the monitoring hole after swelling with water, the water-swellable rubber layer 3 is evenly distributed on the side surface of the base column 2 to avoid the situation where the water-swellable rubber layer 3 cannot completely fit with the hole wall of the monitoring hole due to uneven expansion in some place, thereby achieving the situation where stratification cannot be achieved.

[0040] In some embodiments, the diameter of the guide ring 4 is the same as the diameter of the base column 2 to which the water-swellable rubber layer 3 is attached. The guide ring 4 is generally made of a stainless steel chamfered guide ring 4, and its diameter is larger than the diameter of the base column 2. The excess part is used to provide support for the water-swellable rubber layer 3.

[0041] It should be noted that the number of hollow tubes 1 can be multiple, and the multiple hollow tubes 1 are independently arranged to penetrate the base column 2 and the guide ring 4. The water-stop device with multiple hollow tubes 1 is used when the aquifer in the monitoring hole is divided into multiple layers. For example, when the water layer in the monitoring hole needs to be divided into three layers, two water-stop devices need to be built in at the waterproof layer positions of different depths in the monitoring hole, wherein the water-stop device 8 located in the upper layer needs to have two hollow tubes 1, and the water-stop device 9 located in the lower layer only needs to have one hollow tube 1. The hollow tube 1 of the water-stop device 9 located in the lower layer is connected to the lower part of a hollow tube 1 in the water-stop device 8 located in the upper layer through a connecting pipe 7, and the upper part of a hollow tube 1 of the water-stop device 8 located in the upper layer is connected to the mouth of the monitoring hole through a connecting pipe 7, extending out of the water surface of the first layer, and fixedly connected to the mouth of the monitoring hole. At the same time, the connecting pipe 7 can also prevent the water-swelling rubber layer 3 from sliding down before it is completely in contact with the hole wall of the monitoring hole.

[0042] The upper part of another hollow tube 1 of the water-stopping device 8 located at the upper layer is also connected to the mouth of the monitoring hole through the connecting pipe 7, extending out of the water surface of the first layer and fixedly connected to the mouth of the monitoring hole.

[0043] In this way, the two water-stopping devices divide the aquifer into three mutually isolated layers. From top to bottom, the first layer can directly use the cable 5 to extend the monitoring probe 6 into the first layer for monitoring; and the second layer can reach the second aquifer by extending the monitoring probe 6 through another connecting pipe 7 and the hollow pipe 1 of the water-stopping device 8 located on the upper layer.

[0044] The third water layer can be reached by passing the monitoring probe 6 through a connecting pipe 7 of the water stop device 8 located at the upper layer, the hollow pipe 1 at the upper layer, and the connecting pipe 7 and the hollow pipe 1 of the water stop device at the lower layer. Figure 3 .

[0045] This embodiment also provides a groundwater stratification monitoring system, including any water-stopping device and a monitoring probe 6. The water-stopping device is configured at a preset depth position of the monitoring hole through a plurality of connecting pipes 7. The monitoring probe 6 reaches a predetermined water layer through a plurality of connecting pipes 7 and a hollow pipe 1 in turn to realize monitoring.

[0046] In actual use, the pipe diameter of the water stop device can be adjusted according to actual needs;

[0047] For example, see Figure 1 In a and Figure 2 As shown in a, the base column 2 of the 75mm single-tube water-stopping device is a circular hollow cavity. The base column 2 is 1.0m long and 40mm in diameter. The hollow tube 1 is 20mm in diameter. The base column 2 bears lateral pressure as a whole to maintain the hollow tube 1 without deformation. The hollow tube 1 of the base column 2 extends 30cm to both ends and can be connected to the connecting pipe 7 made of galvanized steel pipe with a wall thickness of 2.5mm, an inner diameter of 20mm and a length of 3m through threads to form a monitoring and equipment maintenance channel. A probe with a diameter of less than 18mm can be lowered into the monitoring channel for measuring groundwater parameters. The water-expandable rubber has an outer diameter of 57mm, a rubber thickness of 8.5mm and a length of 1m. It is put on the base column 2 and locked with chamfered guide rings 4 at both ends.

[0048] For example, see Figure 1 Middle b and Figure 2 As shown in b, the base column 2 of the 95mm single-tube water-stopping device is a circular hollow cavity. The base column 2 is 1.0m long and 58mm in diameter. The hollow tube 1 is 20mm in diameter. The base column 2 bears lateral pressure as a whole to maintain the hollow tube 1 without deformation. The hollow tube 1 of the base column 2 extends 30cm to both ends and can be connected to the connecting pipe 7 made of galvanized steel pipe with a wall thickness of 2.5mm, an inner diameter of 20mm and a length of 3m through threads to form a monitoring and equipment maintenance channel. A probe with a diameter of less than 18mm can be lowered in the monitoring channel for measuring groundwater parameters. The water-expandable rubber has an outer diameter of 75mm, a rubber thickness of 8.5mm and a length of 1m. It is put on the base column 2 and locked with chamfered guide rings 4 at both ends.

[0049] For example, see Figure 1 In c and Figure 2As shown in Figure c, the base column 2 of the 95mm double-tube water-stopping device is a circular two-hole hollow cavity. The base column 2 is 1.0m long and 64mm in diameter. The two hollow tubes 1 inside are 20mm in diameter. The base column 2 as a whole bears lateral pressure to maintain the hollow tube 1 without deformation. The hollow tube 1 of the base column 2 extends 30cm to both ends and can be connected to the connecting pipe 7 made of galvanized steel pipe with a wall thickness of 2.5mm, an inner diameter of 20mm and a length of 3m through threads to form a monitoring and equipment maintenance channel. A probe with a diameter of less than 18mm can be lowered in the monitoring channel for measuring groundwater parameters. The water-expandable rubber has an outer diameter of 81mm, a rubber thickness of 8.5mm and a length of 1m. It is put on the base column 2 and locked with chamfered guide rings 4 at both ends.

[0050] In actual application, the water-stop device is placed in the waterproof layer section. When the water-swelling rubber comes into contact with water, it starts to absorb water and swell, and contacts the hole wall. As the rubber continues to expand, it finally comes into complete contact with the hole wall. The upper and lower aquifers are separated. The swelling rubber is prepared by physical and mechanical blending of nitrile rubber (NBR), sodium polyacrylate (swelling agent), modified aramid staple fiber (reinforcing agent), carbon black, and white carbon black. The water absorption time and swelling rate of the rubber are adjusted by controlling the ratio of sodium polyacrylate and modified aramid staple fiber.

[0051] Generally, if the water-blocking section is deeper and the device is lowered for a longer time, the sodium polyacrylate ratio should be reduced accordingly to extend the expansion time of the expansion rubber and provide sufficient time for the equipment to be lowered. On the contrary, if the water-blocking section is shallow and the device is lowered for a shorter time, the sodium polyacrylate ratio can be increased accordingly to shorten the expansion time of the expansion rubber and achieve the purpose of rapid separation of the aquifer.

[0052] That is, when the rubber ratio is: 100 parts of rubber, 40-80 parts of sodium polyacrylate superabsorbent resin, 4 parts of modified aramid staple fiber, 20 parts of carbon black, and 20 parts of white carbon black, the time it takes for the rubber to complete the separation of the water-isolating section is 12 hours to 7 days. The technology of the water-swelling rubber is cited from China's public patent CN110700348A - a method and device for outer layered water stopping of a groundwater layered pumping test casing.

[0053] The corrosion resistance of water-swelling rubber varies depending on its mineralization degree, and it can generally achieve a water-stopping effect of 5-7 years. In addition, this device can be used in combination with multiple devices to monitor up to 7 aquifers separately.

[0054] This embodiment also provides a groundwater stratification monitoring method, which is implemented based on the system and includes the following steps:

[0055] Step 1: Arrange the water stop device at a preset depth position of the monitoring hole through a plurality of connecting pipes;

[0056] Step 2: When the water-swellable rubber layer of the water-stopping device is completely expanded and contacts the hole wall of the monitoring hole, the water-bearing layer of the monitoring hole is divided into at least two layers;

[0057] Step 3: Pass the monitoring probe through multiple connecting pipes and hollow pipes in turn to reach the predetermined waterproof layer to achieve layered monitoring.

[0058] This device has been successfully demonstrated in the exploration well of the Yinda Jimin Project. The groundwater stratification monitoring water-stopping device needs to expand the aquiclude between multiple aquifers to play a waterproofing role. The monitoring hole used in this application is Xiguoshan Tunnel ZK3, which has a depth of 582.5m, a mixed water level of 88m, and the location of the gravel and mudstone stratification (aquiclude) is 196.56m below the hole mouth. Since there is a pressurized aquifer under the aquiclude, only one connecting pipe needs to be connected to the bottom of the packer, and the top is connected to the wellhead one by one.

[0059] Specifically, wrap one end of a galvanized steel pipe connecting pipe with a wall thickness of 2.5mm, an inner diameter of 20mm, and a length of 3m with a waterproof tape for 3 turns, and then connect it to the 30cm joint extending from the upper end of the waterproof device and tighten it counterclockwise; use a drilling rig to lift the equipment and lower it into the monitoring well. Then, 65 identical galvanized steel pipes are connected to the wellhead one by one in the same way, and a support frame is welded to support the entire set of equipment to prevent the expansion rubber from sliding down before it is fully in contact with the hole wall. The monitoring probe with a cable length of 70m is lowered along the gap between the connecting pipe and the hole wall of the monitoring hole to the upper diving layer, and connected to the wellhead RTU to test the monitoring and signal sending functions. The monitoring probe with a cable length of 200m is lowered into the lower pressure aquifer through the inside of the connecting pipe, and connected in parallel with the wellhead RTU to test the monitoring and signal sending functions.

[0060] After the groundwater parameter monitoring and signal sending function tests are normal, a cement protection pier is made at the wellhead and a protection barrel is used to protect the wellhead and RTU.

[0061] The rubber ratio of the equipment implemented this time is 100 parts of rubber, 60 parts of sodium polyacrylate super absorbent resin, 4 parts of modified aramid staple fiber, 20 parts of carbon black, and 20 parts of white carbon black, so it takes about 2 days to fully expand. Therefore, the effectiveness of the water-stopping device can be verified through monitoring data two days later. The monitoring data showed that the water level rose from 88m to 73.763m and the confined water level dropped from 88m to 164.808m two days later, indicating that the water-stopping effect of the device is normal, the groundwater monitoring data is normal, and the signal transmission is normal, achieving the purpose of unmanned remote real-time stratified monitoring of multiple aquifers.

[0062] The above description is only a preferred embodiment of the present invention and is used to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water stopping device for groundwater stratification monitoring, characterized in that: include: Base column and a water-swellable rubber layer, the water-swellable rubber layer being arranged on a side surface of the base column; Guide rings, which are arranged on the upper and lower sides of the base column and are used to limit the water-swellable rubber layer; A hollow tube is provided passing through the base column and the guide ring.

2. A water stopping device for groundwater stratification monitoring according to claim 1, characterized in that: The diameter of the guide ring is the same as the diameter of the base column to which the water-swellable rubber layer is attached.

3. A water stopping device for groundwater stratification monitoring according to claim 1, characterized in that: The water-swellable rubber layer is evenly distributed on the side surface of the base column.

4. A water stopping device for groundwater stratification monitoring according to claim 1, characterized in that: The diameter of the base column to which the water-swellable rubber layer is attached is 8 to 10 mm smaller than the inner diameter of the monitoring hole.

5. A water stopping device for groundwater stratification monitoring according to claim 1, characterized in that: There are multiple hollow tubes, and the multiple hollow tubes are independently arranged to penetrate the base column and the guide ring.

6. A water stopping device for groundwater stratification monitoring according to claim 1, characterized in that: It also includes a connecting pipe, a plurality of which are connected in sequence and are used to connect the hollow pipe to the wellhead of the monitoring hole to prevent the water-swellable rubber layer from sliding downward before it is in complete contact with the hole wall of the monitoring hole.

7. A groundwater stratification monitoring system, characterized in that: It comprises the water-stopping device and monitoring probe as described in any one of claims 1-6, wherein the water-stopping device is arranged at a preset depth position of the monitoring hole through a plurality of connecting pipes, and the monitoring probe reaches a predetermined aquifer through a plurality of connecting pipes and hollow pipes in turn to realize monitoring.

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