Layered water pumping test device and use method thereof

Abstract

The invention 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] The invention belongs to the technical field of hydrogeological exploration, in particular to a stratified water pumping test device and a use method thereof. Background Art

[0002] Pumping test is a core work in the field of hydrogeological survey and engineering geological survey. Its main purpose is to determine the permeability coefficient of the target rock and soil layer to evaluate the groundwater flow characteristics and aquifer structure. Traditional pumping test usually requires drilling multiple pumping holes and observation holes, and conducting tests separately to obtain the permeability coefficients of multiple target rock and soil layers. However, this method often has large engineering workload and high cost, and it is difficult to adapt to the needs of efficient exploration under complex geological conditions.

[0003] In actual operation, after determining the location of the pumping test layer based on the stratigraphic data revealed by drilling, the filter and water-stopping materials need to be accurately set at the corresponding depth of the pumping hole. In conventional methods, filter media and water-stopping materials are usually bulk materials such as gravel and clay balls, which are installed by calculating their volume and placement order. However, due to the limitations of calculation accuracy and placement operation, this method is often rough and it is difficult to ensure that the filter is accurately in place, which may lead to reduced test accuracy. In addition, during the test, improper installation of bulk materials can easily cause local disturbances in the well, and even cause hole collapse or blockage, posing a threat to the reliability of the pumping test.

[0004] What is more serious is that many pumping test equipment cannot be reused, which further increases the test cost and construction period. During the disassembly and reinstallation process of the few reusable equipment, multiple operations may cause disturbance of the rock and soil in the borehole, or even cause instability of the borehole wall, which directly affects the accuracy and reliability of the test results. Summary of the invention

[0005] In order to solve the problems that the conventional pumping test pumping holes, observation holes and equipment cannot be reused, and the reliability and accuracy of the pumping test results are low, the present invention provides a layered pumping test device and a method for using the same.

[0006] The present invention is achieved through the following technical solutions: On one hand, the present invention discloses a stratified water pumping test device, comprising a water permeable device, an elastic rubber ring, an air pressure control mechanism and a water pumping device; the water permeable device is installed at the position of a target test aquifer, and the water permeable device comprises a flower tube and a pipe clamp; the pipe clamp is installed on the outer wall of the flower tube and corresponds to the position of the target test aquifer; the elastic rubber ring is sleeved on the outer wall of the flower tube and its axial position is limited by the pipe clamp, the air 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 wall and the outer wall of the flower tube; the water pumping device is located at a specified depth below the target test aquifer and is used to extract the water level of the target test aquifer.

[0007] A further improvement of the present invention is that the flower tube is a hollow round pile-shaped steel tube, and circular holes with equal diameters are evenly distributed on the tube wall of the flower tube.

[0008] A further improvement of the present invention is that the outer wall of the flower tube is engraved with scales from bottom to top, and both upper and lower ends of the flower tube are provided with threads; and multiple sections of the flower tube are connected by threads.

[0009] A further improvement of the present invention is that the pipe clamp is in the shape of a right-angled circular ring, four circular holes are evenly arranged in the circumference direction of the pipe clamp, and 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.

[0010] A further improvement of the present invention is that the water permeable device also includes a filter, which is installed on the outer wall of the flower tube and fixed to the inner side of the target test aquifer through a pipe clamp.

[0011] A further improvement of the present invention 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 floral tube for closing the floral tube; the air extraction detection valve and the pressure control valve are installed on the air pressure pipe and are located on one side of the air compressor.

[0012] A further improvement of the present invention is that it also includes a pumping device, which includes a submersible pump and a water outlet pipe. The submersible pump is installed below the target test aquifer and extracts water from the target test aquifer through the water outlet pipe.

[0013] A further improvement of the present invention is that it also includes a measuring device, which includes a water meter and an electric water level gauge; the water meter is installed on the water outlet pipe, and the electric water level gauge is installed on the submersible pump.

[0014] Another aspect of the present invention discloses a method for using a stratified pumping test device, comprising the following steps: Determine the distribution location of the target pumping test layer; Connect the bottom bracket and the flower pipe through threads and lower them into the water pumping hole, and fix the pipe clamp, elastic rubber ring and filter; Open the air extraction test valve to conduct air extraction test. When the air tightness of the elastic rubber ring and the air pressure pipeline is qualified, lower the submersible pump and the electric water level gauge to a certain depth below the test aquifer and connect the water outlet pipe. Turn on the submersible pump to pump water and wash the well; After the well washing is completed, the air compressor is turned on. The high-pressure gas generated by the air compressor enters the elastic rubber ring through the threaded distribution joint and the air pressure pipe in turn. The elastic rubber ring expands and fills the space between the outer wall of the flower tube and the inner wall of the hole. When the gas pressure reaches the set pressure, the pressure control valve opens; The water level in the well is measured by electric water level meter, the submersible pump is turned on to pump water, and the water inflow is measured by water meter; After the pumping test of a single target water-bearing test layer is completed, the air compressor is depressurized and the elastic rubber ring retracts; Repeat the above steps to carry out the pumping test of the next target water-containing test layer.

[0015] It can be seen from the above technical solutions that the beneficial effects of the present invention are as follows: This stratified pumping test device significantly improves the test accuracy, reduces the test cost, and enhances the applicability and operational flexibility through modular design and efficient use methods. The device uses elastic rubber rings to achieve precise isolation between aquifers, and cooperates with filters to effectively filter water and block sand, ensuring the reliability of the pumping test data. Each component can be reused, and tests on multiple aquifers can be completed in a single pumping hole, reducing engineering consumption and time costs. The air pressure control system ensures the safety and stability of the test, and the overall design of the device is simple and highly adaptable, which can flexibly respond to different formation conditions, becoming a practical, economical and efficient technological innovation in the field of hydrogeology and engineering geological surveys. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of a specific implementation method of the present invention.

[0018] Figure 2 It is a schematic diagram of the bottom support structure of a specific embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the pipe clamp installation structure according to a specific embodiment of the present invention.

[0020] In the attached figure: 1. air compressor; 2. air extraction detection valve; 3. pressure control valve; 4. scale; 5. threaded joint; 6. flower pipe; 7. air pressure pipe; 8. elastic rubber ring; 9. pipe clamp; 10. filter; 11. rock and soil layer; 12. bottom support; 13. submersible pump; 14. outlet pipe; 15. groundwater level; 16. bolt; 17. water meter; 18. threaded distribution joint. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0022] As shown in the figure, reference Figure 1-3 As shown, the present invention discloses a stratified pumping test device and a method of using the same, which is installed on a rock layer 11 and a groundwater level 15 to extract groundwater from the groundwater level 15. The device can perform pumping tests on multiple aquifers in the same pumping hole, and the test cost is low; at the same time, the device can greatly meet the requirements of different well diameters and has strong applicability.

[0023] The device comprises a water permeable device, an elastic rubber ring 8, an air pressure control mechanism, a water pumping device and a measuring device.

[0024] Specifically, the water-permeable device includes a flower tube 6, a pipe clamp 9 and a filter 10; the flower tube 6 is a hollow round pile steel tube, and circular holes of equal diameter are evenly distributed on its tube wall. The standard length of each section of the flower tube 6 is 5m, which can be cut into different lengths. The outer wall of the flower tube 6 is engraved with scales 4 from bottom to top, and the upper and lower ends of the flower tube 6 are threaded, and multiple flower tubes 6 can be connected by threads. The pipe clamp 9 is a right-angled annular steel material, and four circular holes are evenly arranged along the circumference direction of the pipe clamp 9. It can be fixed on the outer wall of the flower tube 6 by passing through the circular holes of the pipe clamp 9 and the circular holes of the flower tube 6 through four bolts 16. The pipe clamp 9 can limit the elastic rubber ring 8 outside the test aquifer, and can also prevent the filter 10 from colliding with the well wall and being damaged by friction during the lowering process. The filter 10 is made of a dense diamond yarn mesh, filled with filter material, and the filter material particle size is about 10 times the particle size of the test aquifer. The function of the filter 10 is to support the wall, filter water and block sand. The flower tube 6 can support the elastic rubber ring 8 and the filter 10 to prevent the elastic rubber ring 8 from longitudinally contracting when the elastic rubber ring 8 expands radially. The tube clamp 9 can limit the elastic rubber ring 8 and the filter 10 to a specified depth.

[0025] The water-stopping device 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 bottom bracket 12. When the pressure of the air compressor 1 reaches the set pressure, the pressure control valve 3 automatically opens to prevent the elastic rubber ring 8 from rupturing due to excessive pressure; the elastic rubber ring 8 is placed outside the test section aquifer outside the flower tube 6, and is connected to the air compressor 1 through the threaded distribution joint 18 and the air pressure pipe 7. After the elastic rubber ring 8 expands, it fills between the flower tube 6 and the hole wall to achieve the effect of water stopping and wall protection; after the water extraction test is completed, the air compressor 1 is depressurized, and the elastic rubber ring 8 shrinks and recovers. The air compressor 1, the air pressure pipe 7, and the elastic rubber ring 8 are all connected by a threaded joint 5 with a sealing gasket. The bottom bracket 12 is in the shape of a bottle cap and made of steel. The inner diameter of the bottom bracket 12 is consistent with the outer diameter of the flower tube 6. The two are connected by threads to close the bottom of the flower tube 6.

[0026] The pumping device is composed of a submersible pump 13 and a water outlet pipe 14 ; the submersible pump 13 is installed below the target test aquifer and extracts water from the target test aquifer through the water outlet pipe 14 .

[0027] The measuring device comprises a water meter 17 and an electric water level gauge; the water meter 17 is installed on the water outlet pipe 14 , and the electric water level gauge is installed on the submersible pump 13 .

[0028] The stratified pumping test device is used as follows: firstly, a wet or dry method is used to drill a hole, and the distribution position of the target pumping test layer is determined according to the stratum distribution and technical requirements; then, the well pipe arrangement design is carried out, and the bottom bracket 12 and the flower pipe 6 are threadedly connected one by one and then lowered into the pumping hole, and the pipe clamp 9, the elastic rubber ring 8, and the filter 10 are fixed at the corresponding positions; the air extraction detection valve 2 is opened to perform an air extraction test, and 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 electric water level gauge are lowered together to a certain depth below the test aquifer, and the outlet pipe 14 is connected. , start the submersible pump 13 to pump water and wash the well to make the water clear and sand free from sediment; after the well washing is completed, start the air compressor 1, 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 in turn, and the elastic rubber ring 8 expands and fills between the outer wall of the flower tube 6 and the inner wall of the hole to achieve 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 electric water level measurement, and the water inflow is measured by water meter 17. After the pumping test of a single target water-bearing test layer is completed, the air compressor 1 is depressurized, the elastic rubber ring 8 retracts, and the above test devices are taken out in turn. The above steps can be repeated to carry out the pumping test of the next target water-bearing test layer, or a mixed pumping test of multiple water-bearing test layers can be carried out. The stratified pumping test should follow the principle sequence from top to bottom, stratification first and then mixing, 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, then conduct the mixed pumping test.

[0029] This stratified pumping test device and its use method, through modular design and efficient use methods, significantly improves test accuracy, reduces test costs, and enhances applicability and operational flexibility. The device uses elastic rubber rings to achieve precise isolation between aquifers, and cooperates with filters to effectively filter water and block sand, ensuring the reliability of pumping test data. Each component can be reused, and multiple aquifer tests can be completed in a single pumping hole, reducing engineering consumption and time costs. The air pressure control system ensures the safety and stability of the test, and the overall design of the device is simple and adaptable, which can flexibly respond to different formation conditions, becoming a practical, economical and efficient technological innovation in the field of hydrogeology and engineering geological surveys.

[0030] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stratified pumping test device, characterized in that: The invention comprises a water permeable device, an elastic rubber ring (8), an air pressure control mechanism and a water pumping device; the water permeable device is installed at the position of a target test aquifer, and the water permeable device comprises a flower tube (6) and a pipe clamp (9); the pipe clamp (9) is installed on the outer wall of the flower tube (6) and corresponds to the position of the target test aquifer; the elastic rubber ring (8) is sleeved on the outer wall of the flower tube (6) and its axial position is limited by the pipe clamp (9); the air pressure 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 wall and the outer wall of the flower tube (6); the water pumping device is located at a specified depth below the target test aquifer and is used to extract the water level of the target test aquifer.

2. The stratified pumping test device according to claim 1, characterized in that: The flower tube (6) is a hollow round pile-shaped steel tube, and circular holes of equal diameter are evenly distributed on the tube wall of the flower tube (6).

3. The stratified pumping test device 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 upper and lower ends of the flower tube (6) are provided with threads; multiple sections of the flower tube (6) are connected by threads.

4. The stratified pumping test device according to claim 3, characterized in that: The pipe hoop (9) is in the shape of a right-angled circular ring, and four circular holes are evenly arranged in the circumferential direction of the pipe hoop (9). The circular holes of the pipe hoop (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 device according to claim 4, characterized in that: The water permeable device further comprises a filter (10), wherein the filter (10) is mounted on the outer wall of the flower tube ((6)) and is fixed to the inner side of the target test aquifer via a pipe clamp (9).

6. The stratified pumping test device according to claim 1, characterized in that: The air pressure control mechanism comprises 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) via the threaded distribution joint (18) and the air pressure pipe (7); the base (12) is installed at the bottom of the flower tube (6) for sealing the flower tube (6); the air extraction detection valve (2) and the pressure control valve (3) are installed on the air pressure pipe (7) and are located on one side of the air compressor (1).

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

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

9. A method for using a stratified pumping test device, characterized in that: The following steps are included: Determine the distribution location of the target pumping test layer; Connect the bottom bracket and the flower pipe through threads and lower them into the water pumping hole, and fix the pipe clamp, elastic rubber ring and filter; Open the air extraction test valve to conduct air extraction test. When the air tightness of the elastic rubber ring and the air pressure pipeline is qualified, lower the submersible pump and the electric water level gauge to a certain depth below the test aquifer and connect the water outlet pipe. Turn on the submersible pump to pump water and wash the well; After the well washing is completed, the air compressor is turned on. The high-pressure gas generated by the air compressor enters the elastic rubber ring through the threaded distribution joint and the air pressure pipe in turn. The elastic rubber ring expands and fills the space between the outer wall of the flower tube and the inner wall of the hole. When the gas pressure reaches the set pressure, the pressure control valve opens; The water level in the well is measured by electric water level meter, the submersible pump is turned on to pump water, and the water inflow is measured by water meter; After the pumping test of a single target water-bearing test layer is completed, the air compressor is depressurized and the elastic rubber ring retracts; Repeat the above steps to carry out the pumping test of the next target water-containing test layer.

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