Layered water pumping test device

Abstract

The utility model discloses a layered water pumping test device and a use method thereof, and belongs to the technical field of hydrogeological survey. The layered water pumping test device comprises a water permeable device, an elastic rubber ring, an air pressure control mechanism and a water pumping device; the permeable device is mounted at the position of a target test aquifer and comprises a floral tube and a tube hoop; the pipe hoop is mounted on the outer wall of the floral pipe and corresponds to the position of a target test aquifer; the rubber ring is sleeved on the outer wall of the floral tube, and the axial position of the rubber ring is limited by the tube hoop; the pneumatic control mechanism is connected with the rubber ring and drives the elastic rubber ring to expand or contract so as to fill a gap between the inner wall and the outer wall of the floral tube; the water pumping device is located at a specified depth below the target test aquifer and is used for pumping the water level of the target test aquifer; the test precision is remarkably improved, the test cost is reduced, the applicability and the operation flexibility are enhanced, and accurate isolation between the aquifers is achieved through the elastic rubber rings.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogeological exploration technology, specifically a stratified pumping test device. Background Technology

[0002] Pumping tests are a core task in hydrogeological and engineering geological exploration, primarily aimed at determining the permeability coefficient of target soil and rock layers to assess groundwater flow characteristics and aquifer structure. Traditional pumping tests typically require drilling multiple pumping and observation wells to obtain permeability coefficients for multiple target soil and rock layers. However, this method is often labor-intensive and costly, making it unsuitable for the efficient exploration needs under complex geological conditions.

[0003] In practice, after determining the location of the pumping test layer based on the formation data revealed by drilling, the filter and sealing material need to be precisely installed at the corresponding depth of the pumping hole. Conventional methods typically use loose materials such as gravel and clay balls for the filter media and sealing material, and their installation is based on calculations of their volume and placement sequence. However, due to limitations in calculation accuracy and placement operations, this method often suffers from roughness, making it difficult to ensure accurate filter placement and potentially reducing test precision. Furthermore, improper installation of loose materials during the test can easily cause localized disturbances within the well, and may even lead to well collapse or blockage, threatening the reliability of the pumping test.

[0004] Even more serious is the fact that many pumping test devices and equipment are currently not reusable, further increasing testing costs and construction time. The few reusable devices, during disassembly and reinstallation, may cause disturbance to the soil and rock within the borehole due to repeated operations, even leading to borehole instability, directly affecting the accuracy and reliability of the test results. Utility Model Content

[0005] To address the shortcomings of conventional pumping tests, such as the inability to reuse pumping holes, observation holes, and equipment, and the low reliability and accuracy of pumping test results, this utility model provides a stratified pumping test device and its usage method.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model discloses a stratified pumping test device, including a permeable device, an elastic rubber ring, a pressure control mechanism, and a pumping device. The permeable device is installed at the target aquifer location and includes a perforated pipe and a clamp. The clamp is installed on the outer wall of the perforated pipe and corresponds to the position of the target aquifer. The elastic rubber ring is fitted on the outer wall of the perforated pipe and its axial position is limited by the clamp. The pressure control mechanism is connected to the elastic rubber ring and drives the elastic rubber ring to expand or contract to fill the gap between the inner and outer walls of the perforated pipe. The pumping device is located at a specified depth below the target aquifer and is used to pump the water level of the target aquifer.

[0008] A further improvement of this utility model is that the flower tube is a hollowed-out circular pile-shaped steel tube, and the tube wall of the flower tube has evenly distributed circular holes of equal diameter.

[0009] A further improvement of this utility model is that the outer wall of the flower tube is engraved with graduations from bottom to top, and both the upper and lower ends of the flower tube are threaded; multiple sections of the flower tube are connected by threads.

[0010] A further improvement of this utility model is that the pipe clamp is a right-angled circular ring, and four circular holes are evenly arranged along the circumference of the pipe clamp. The circular holes of the pipe clamp and the circular holes of the flower tube are fixed to the outer wall of the flower tube by bolts.

[0011] A further improvement of this utility model is that the permeable device also includes a filter, which is installed on the outer wall of the perforated pipe and fixed to the inner side of the target test aquifer by a pipe clamp.

[0012] A further improvement of this utility model is that the air pressure control mechanism includes an air compressor, an air extraction detection valve, a pressure control valve, a threaded distribution joint, an air pressure pipe, and a base; the elastic rubber ring is connected to the air compressor through the threaded distribution joint and the air pressure pipe; the base is installed at the bottom of the perforated pipe to seal the perforated pipe; the air extraction detection valve and the pressure control valve are installed on the air pressure pipe and located on one side of the air compressor.

[0013] A further improvement of this utility model is that it also includes a water pumping device, which includes a submersible pump and a water outlet pipe. The submersible pump is installed below the target test aquifer and pumps water from the target test aquifer through the water outlet pipe.

[0014] As can be seen from the above technical solutions, the beneficial effects of this utility model are as follows: This stratified pumping test device, through modular design and efficient usage, significantly improves test accuracy, reduces test costs, and enhances applicability and operational flexibility. The device utilizes elastic rubber rings to achieve precise isolation between aquifers, and, in conjunction with filters, effectively filters water and blocks sand, ensuring the reliability of pumping test data. All components are reusable, and tests on multiple aquifers can be completed within a single pumping hole, reducing engineering consumption and time costs. The air pressure control system ensures the safety and stability of the test, while the overall design of the device is simple and highly adaptable, flexibly responding to different geological conditions, making it a practical, economical, and efficient technological innovation in the fields of hydrogeology and engineering geology exploration. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the base structure of a specific embodiment of the present utility model.

[0018] Figure 3 This is a schematic diagram of the pipe clamp installation structure according to a specific embodiment of the present utility model.

[0019] In the attached diagram: 1. Air compressor; 2. Air extraction detection valve; 3. Pressure control valve; 4. Scale; 5. Threaded connector; 6. Perforated pipe; 7. Air pressure pipe; 8. Elastic rubber ring; 9. Pipe clamp; 10. Filter; 11. Soil layer; 12. Base support; 13. Submersible pump; 14. Water outlet pipe; 15. Groundwater level; 16. Bolt; 17. Water meter; 18. Threaded distribution connector. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] As shown in the figure, refer to Figure 1-3As shown, this utility model discloses a stratified pumping test device and its usage method. It is installed on the soil layer 11 and the groundwater level 15 to extract groundwater at the groundwater level 15. This device can conduct pumping tests on multiple aquifers in the same pumping hole, and the test cost is low. At the same time, this device can greatly meet the requirements of different well diameters and has strong applicability.

[0022] The device includes a water-permeable device, an elastic rubber ring 8, a pneumatic control mechanism, a pumping device, and a measuring device.

[0023] Specifically, the permeable device includes a perforated pipe 6, a pipe clamp 9, and a filter 10. The perforated pipe 6 is a hollowed-out circular steel pipe with evenly distributed circular holes of equal diameter on its wall. Each section of the perforated pipe 6 has a standard length of 5m and can be cut into different lengths. The outer wall of the perforated pipe 6 is engraved with graduations 4 from bottom to top. Both ends of the perforated pipe 6 are threaded, and multiple perforated pipes 6 can be connected by threads. The pipe clamp 9 is a right-angled circular steel material with four evenly distributed circular holes along its circumference. Four bolts 16 pass through the circular holes of the pipe clamp 9 and the perforated pipe 6 to fix it to the outer wall of the perforated pipe 6. The pipe clamp 9 can confine the elastic rubber ring 8 outside the test aquifer and prevent the filter 10 from impacting or rubbing against the well wall during the lowering process. The filter 10 is made of fine-mesh diamond mesh and filled with filter media. The particle size of the filter media is about 10 times that of the test aquifer. The function of the filter 10 is to support the well wall, filter water, and prevent sand from entering. The perforated tube 6 can support the elastic rubber ring 8 and the filter 10, preventing longitudinal contraction when the elastic rubber ring 8 expands radially. The tube clamp 9 can confine the elastic rubber ring 8 and the filter 10 to a specified depth.

[0024] The water-stopping device includes an air compressor 1, a suction detection valve 2, a pressure control valve 3, a threaded distribution joint 18, a pressure pipe 7, and a base 12. When the pressure of the air compressor 1 reaches the set pressure, the pressure control valve 3 automatically opens to prevent excessive pressure from causing the elastic rubber ring 8 to rupture. The elastic rubber ring 8 is placed outside the water-bearing layer of the test section outside the perforated pipe 6, and is connected to the air compressor 1 through the threaded distribution joint 18 and the pressure pipe 7. After the elastic rubber ring 8 expands, it fills the space between the perforated pipe 6 and the borehole wall, thus achieving the effects of water stoppage and wall protection. After the water pumping test is completed, the air compressor 1 is depressurized, and the elastic rubber ring 8 shrinks back to its original shape. The air compressor 1, the pressure pipe 7, and the elastic rubber ring 8 are all connected by threaded joints 5 with sealing gaskets. The base 12 is bottle cap shaped and made of steel. The inner diameter of the base 12 is the same as the outer diameter of the perforated pipe 6, and the two are connected by threads to seal the bottom of the perforated pipe 6.

[0025] The pumping device consists of a submersible pump 13 and an outlet pipe 14; the submersible pump 13 is installed below the target test aquifer and pumps water from the target test aquifer through the outlet pipe 14.

[0026] The measuring device includes a water meter 17 and an electrical water level gauge; the water meter 17 is installed on the water outlet pipe 14, and the electrical water level gauge is installed on the submersible pump 13.

[0027] The method of using the stratified pumping test device is as follows: First, a hole is drilled using wet or dry methods. The distribution location of the target pumping test layer is determined according to the formation distribution and technical requirements. Then, the well pipe arrangement is designed. The bottom support 12 and the perforated pipe 6 are connected one by one by thread and lowered into the pumping hole. The pipe clamp 9, the elastic rubber ring 8, and the filter 10 are fixed in the corresponding positions. The air pumping test valve 2 is opened to perform air pumping test. After confirming that the air tightness of the elastic rubber ring 8 and the air pressure pipe 7 is qualified, the submersible pump 13 and the electrical level gauge are lowered together to a certain depth below the test aquifer and connected to the outlet pipe 14. The submersible pump 13 is turned on to pump water and flush the well until the water is clear, sand-free, and free of sediment. After flushing, the air compressor 1 is turned on, and the high-pressure gas generated by the air compressor 1 enters the elastic rubber ring 8 through the threaded distribution joint 18 and the air pressure pipe 7. The elastic rubber ring 8 expands and fills the space between the outer wall of the perforated pipe 6 and the inner wall of the hole, thus achieving a water-stopping effect. When the gas pressure reaches the set pressure, the pressure control valve 3 automatically opens to prevent the elastic rubber ring 8 from rupturing due to excessive pressure. After the above preparations are completed, test pumping and formal pumping are carried out. During the test, the water level in the well is measured by an electrical water level meter, and the water inflow is measured by a water flow meter 17. After the pumping test of a single target aquifer is completed, the air compressor 1 is depressurized, the elastic rubber ring 8 retracts, and the above test device is removed. The above steps can be repeated to conduct pumping tests on the next target aquifer, or mixed pumping tests can be conducted on multiple aquifers. The stratified pumping test should follow the principle of top-down, first stratified and then mixed, that is, first conduct the pumping test of the upper aquifer, then the pumping test of the lower aquifer, first conduct the stratified pumping test, and then conduct the mixed pumping test.

[0028] This stratified pumping test apparatus and its operating method, through modular design and efficient operation, significantly improve test accuracy, reduce test costs, and enhance applicability and operational flexibility. The apparatus utilizes elastic rubber rings to achieve precise isolation between aquifers, and, in conjunction with filters, effectively filters water and blocks sand, ensuring the reliability of pumping test data. All components are reusable, and multiple aquifers can be tested within a single pumping hole, reducing engineering consumption and time costs. The air pressure control system ensures the safety and stability of the test, while the overall design of the apparatus is simple and highly adaptable, flexibly responding to different geological conditions, making it a practical, economical, and efficient technological innovation in the fields of hydrogeology and engineering geology exploration.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stratified pumping test device, characterized in that, The device includes a permeable device, an elastic rubber ring (8), a pneumatic control mechanism, and a pumping device. The permeable device is installed at the target aquifer location and includes a perforated pipe (6) and a clamp (9). The clamp (9) is installed on the outer wall of the perforated pipe (6) and corresponds to the location of the target aquifer. The elastic rubber ring (8) is fitted on the outer wall of the perforated pipe (6) and its axial position is limited by the clamp (9). The pneumatic control mechanism is connected to the elastic rubber ring (8) and drives the elastic rubber ring (8) to expand or contract to fill the gap between the inner and outer walls of the perforated pipe (6). The pumping device is located at a specified depth below the target aquifer and is used to pump the water level of the target aquifer.

2. The stratified pumping test apparatus according to claim 1, characterized in that, The flower tube (6) is a hollowed-out round pile-shaped steel pipe, and the pipe wall of the flower tube (6) has round holes of equal diameter evenly distributed.

3. The stratified pumping test apparatus according to claim 2, characterized in that, The outer wall of the flower tube (6) is engraved with scales (4) from bottom to top, and both the upper and lower ends of the flower tube (6) are threaded; multiple sections of flower tube (6) are connected by threads.

4. The stratified pumping test apparatus according to claim 3, characterized in that, The pipe clamp (9) is a right-angled circular ring. Four circular holes are evenly arranged in the circumferential direction of the pipe clamp (9). The circular holes of the pipe clamp (9) and the circular holes of the flower tube (6) are fixed to the outer wall of the flower tube (6) by bolts (16).

5. The stratified pumping test apparatus according to claim 4, characterized in that, The permeable device also includes a filter (10), which is installed on the outer wall of the perforated pipe ((6)) and fixed to the inner side of the target test aquifer by a pipe clamp (9).

6. The stratified pumping test apparatus according to claim 1, characterized in that, The air pressure control mechanism includes an air compressor (1), an air extraction detection valve (2), a pressure control valve (3), a threaded distribution joint (18), an air pressure pipe (7), and a base (12); the elastic rubber ring (8) is connected to the air compressor (1) through the threaded distribution joint (18) and the air pressure pipe (7); the base (12) is installed at the bottom of the perforated pipe (6) to seal the perforated pipe (6); the air extraction detection valve (2) and the pressure control valve (3) are installed on the air pressure pipe (7) and located on one side of the air compressor (1).

7. The stratified pumping test apparatus according to claim 6, characterized in that, It also includes a pumping device, which includes a submersible pump (13) and an outlet pipe (14). The submersible pump (13) is installed below the target test aquifer and pumps water from the target test aquifer through the outlet pipe (14).

8. The stratified pumping test apparatus according to claim 7, characterized in that, It also includes a measuring device, which includes a water meter (17) and an electrical level gauge; the water meter (17) is installed on the outlet pipe (14), and the electrical level gauge is installed on the submersible pump (13).

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