Ultra-deep water level measuring system and method for water pumping test

Abstract

The invention discloses an ultra-deep water level measuring system and method for a water pumping test, and relates to the field of water level measurement, the ultra-deep water level measuring system comprises an underground water level measuring module and a data correction module, the underground water level measuring module comprises a single-line measuring rope, a probe and a pump pipe, one end of the single-line measuring rope is connected with the probe, and a gyro inclinometer is arranged in the probe; the hole drift angle and azimuth angle measuring function is achieved; the pump pipe is connected with the other end of the single-line measuring rope through a loop closed line; after the probe is contacted with underground water, the single-line measuring rope, the probe, the pump pipe and the underground water form a closed loop; the data correction module is used for correcting the elastic elongation of the measuring rope and correcting the well deviation direction, and correcting the elongation of the measuring rope by utilizing the length of the measuring rope output by the underground water level measuring module; well deviation correction is conducted through the well deviation and the direction output by the underground water level measuring module; and finally outputting the corrected underground water level depth. The problems that a double-line measuring rope loop is prone to false triggering, prone to breakage and open circuit, insufficient in measuring depth and the like are solved, and the method is suitable for automatic measurement of the ultra-deep underground water level.

Description

Technical Field

[0001] The invention relates to the field of water level measurement, and in particular to an ultra-deep water level measurement system and a measurement method for a pumping test. Background Art

[0002] After the construction of hydrological wells, geothermal wells, coal mine observation wells, etc., it is usually necessary to conduct a pumping test (extracting a certain amount of water to measure the change of groundwater level at different times) to obtain hydrogeological parameters, determine the water richness of the aquifer, the hydraulic connection between each aquifer and the surface water, boundary properties, groundwater recharge channels, etc., so as to evaluate the water output capacity of the wellbore. The existing groundwater level measurement technology or device is generally a two-wire measuring rope loop, which consists of a two-wire measuring rope, a probe, and a multimeter. One end of the two-wire measuring rope is connected to the two poles of the multimeter, and the other end is set to be broken at the probe. When the probe contacts the groundwater, the two-wire measuring rope is broken and connected to form a closed loop. The pointer of the multimeter swings. At this time, the length of the measuring rope is the depth of the groundwater level.

[0003] There are some problems in the implementation of the existing technology: First, the measuring rope is double-wire. When seepage water, submersible pump return water or condensation water appears in the hole, the probe is prone to false triggering, resulting in inaccurate water level measurement; Second, the double-wire measuring rope is prone to damage during repeated pulling, forming a circuit break, which leads to failure of the measuring rope; Third, the double-wire measuring rope is generally composed of two ordinary cables. If a thicker specification is used, it is not conducive to lowering the measuring rope. If a thinner specification is used, the tensile strength is weak. When the measuring rope encounters resistance in the hole or the measuring pipe, it is easy to break; Fourth, the double-wire measuring rope is generally short due to its own elongation, strength, weight and other limitations. When the water-bearing layer is less rich in water, the water level drops greatly in the pumping test, and the dynamic water level is deep, which cannot be measured by the double-wire measuring rope; Fifth, most pumping tests require manual operation and recording. At present, some groundwater level measurement devices have also appeared. Distance measurement is carried out by using electromagnetic or laser devices, or in combination with depth sounding devices, sampling devices, etc., to achieve multiple functions. For example, CN111677502B discloses a water level measuring device and a pumping test system. The measuring mechanism cooperates with a reflector and a float to obtain the water level, flow rate, depth drawdown and other items in the well required in the pumping test; CN116718247B discloses a groundwater level detection device for hydrogeological exploration. The reinforcement sleeve mechanism on the outside of the tape measure can realize the free switching of the tape measure between the reeled state and the straight state, thereby improving the strength of the detection rope and facilitating operation and carrying; CN113624300B discloses a water level measuring device and a measuring method for an observation well. The measuring component includes a measuring rope and a magnetic induction component. The magnetic induction component is connected to the measuring rope to measure the water level through the magnetic induction characteristics of the magnetic induction component.

[0004] The above solutions are mostly used in shallow wells, groundwater monitoring wells and other fields. The use environment is limited and cannot meet the application requirements of pumping tests with large water level drawdown and deep dynamic water level. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an ultra-deep water level measurement system and method for pumping test, which can solve the problems of easy false triggering, easy damage and breaking of the double-wire measuring rope circuit, insufficient measurement depth, etc., and is suitable for automatic measurement of ultra-deep groundwater level.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, an embodiment of the present invention provides an ultra-deep water level measurement system for a pumping test, comprising: The groundwater level measurement module includes a single-line measuring rope, a probe and a pump pipe. One end of the single-line measuring rope is connected to the probe. The probe has a built-in gyro inclinometer and has the function of measuring the well inclination and azimuth. The pump pipe is connected to the other end of the single-line measuring rope through a loop closed line. After the probe contacts the groundwater, the single-line measuring rope, the probe, the pump pipe and the groundwater form a closed loop. The data correction module is used for correcting the elastic elongation of the measuring rope and the well inclination and azimuth. The measuring rope length output from the groundwater level measurement module is used to correct the elongation of the measuring rope; the well inclination and azimuth output from the groundwater level measurement module are used to correct the well inclination; and finally the corrected groundwater level depth is output.

[0007] As a further implementation, a measuring tube is fixed to one side of the pump tube, and one end of the single-line measuring rope connected to the probe extends into the measuring tube.

[0008] As a further implementation, a plugging component is installed at one end of the measuring pipe, and a pipe section of the measuring pipe close to the plugging component is provided with a plurality of through holes for groundwater to enter the measuring pipe.

[0009] As a further implementation, the single-line measuring rope is wound on an electric winch, the electric winch is installed on the orifice device, and the electric winch is installed with a depth sensor, and the depth sensor is used to detect the length of the measuring rope.

[0010] As a further implementation, the single-wire measuring rope is a rubber-coated steel wire.

[0011] As a further implementation, the depth sensor and the electric winch are connected to a control system, and the control system is used to control the action of the electric winch according to a closed loop state.

[0012] As a further implementation, the measuring pipe is a PVC pipe; the measuring pipe is spliced ​​by a plurality of pipe sections, and the spliced ​​parts of adjacent pipe sections are connected by couplings.

[0013] In a second aspect, an embodiment of the present invention further provides an ultra-deep water level measurement method for a pumping test, using the measurement system, comprising: During the process of lowering the submersible pump, the measuring pipe is lowered into the well along with the pump pipe and is inserted into the reserved groove of the pump pipe flange; a single-line measuring rope with a probe is lowered into the measuring pipe to contact the static water level; Turn on the submersible pump connected to the pump pipe and start the pumping test; at this time, the water level drops, the closed circuit is disconnected, and the electric winch drives the probe down; after the probe contacts the groundwater, the single-line measuring rope, the probe, the groundwater, and the pump pipe form a closed circuit, and the electric winch stops working; When the water level drops, the closed circuit is disconnected again, and the electric winch is restarted to lower the probe to continuously measure the dynamic water level depth; After the water level stabilizes, turn off the submersible pump; at this time, the circuit is closed, and the electric winch drives the probe to rise; after the probe is separated from the groundwater, the single-line measuring rope, probe, groundwater, and pump pipe form a short circuit, and the electric winch stops working; when the water level rises, the circuit is closed again, and the electric winch restarts to lift the probe, continuously measuring the dynamic water level depth until the water level is restored to stability.

[0014] As a further implementation method, the depth sensor and the gyro inclinometer measure the single-line measuring rope, well inclination and azimuth according to the set time nodes and measurement intervals, and calculate the actual length of the single-line measuring rope after elastic stretching; the corrected groundwater level depth is calculated based on the well inclination and azimuth.

[0015] As a further implementation, the actual length of the single-line measuring rope after elastic elongation is equal to the sum of the original measuring rope length and the total elongation of the single-line measuring rope; The gyro inclinometer measures the well inclination angle and azimuth angle once at every set interval, and corrects the dynamic water level depth according to the minimum curvature method.

[0016] The beneficial effects of the present invention are as follows: The present invention adopts a single-line measuring rope in combination with a pump pipe to form a single-line measuring rope-pump pipe-groundwater closed loop. Even if the single-line measuring rope is damaged or there is backflow water, seepage water, or condensed water, it will not be triggered by mistake. The single-line measuring rope adopts rubber-coated steel wire, and its tensile strength far exceeds that of the double-line measuring rope. The possibility of measuring accidents such as rope jamming in actual operation is smaller. Moreover, under the same conditions, the unit elongation and diameter of the rubber-coated steel wire are smaller, and the measurable depth depends on the lowering depth of the submersible pump and the measuring pipe and the length of the rubber-coated steel wire. The measuring depth is greater, so it is suitable for ultra-deep water level measurement above 400m.

[0017] The electric winch of the present invention can be automatically controlled and the depth sensor is used to realize automatic measurement of the depth of the single-line measuring rope. Since the single-line measuring rope of the ultra-deep water level has a large dead weight, the influence of the elastic elongation of the measuring rope is considered to correct the measurement data. In addition, the measured depth is corrected using the well inclination and azimuth data to improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 is a schematic diagram of the structure of a measurement system according to one or more embodiments of the present invention; Figure 2 is a schematic diagram of a measurement system according to one or more embodiments of the present invention; Figure 3 is a schematic diagram of a measuring tube structure according to one or more embodiments of the present invention; Figure 4 is a schematic diagram of a flange structure according to one or more embodiments of the present invention; Figure 5 is a schematic diagram of a probe structure according to one or more embodiments of the present invention; Figure 6 is a schematic structural diagram of a groundwater measurement module according to one or more embodiments of the present invention; Figure 7 is a schematic diagram of the structure of a data correction module according to one or more embodiments of the present invention; Figure 8 is a data correction flow chart according to one or more embodiments of the present invention; Fig. 9 is a test flow chart according to one or more embodiments of the present invention.

[0020] Among them, 1. measuring pipe, 2. single-line measuring rope, 3. pump pipe, 4. submersible pump, 5. probe, 6. coupling, 7. flange, 8. cable, 9. orifice device, 10. electric winch, 11. depth sensor, 12. loop closing line, 13. wiring clamp, 14. valve, 15. flow meter, 16. water outlet, 17. control cabinet, 18. through hole, 19. slot, 20. gyro inclinometer, 21. suspension mechanism, 22. guide mechanism. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0022] Embodiment 1: In order to solve the problems that the double-line measuring rope loop is prone to false triggering, resulting in inaccurate water level measurement, and the existing measuring device is not suitable for deep water level measurement, this embodiment provides an ultra-deep water level measurement system for pumping test, using a single-line measuring rope 2-pump pipe 3-groundwater loop. The single-line measuring rope 2 uses rubber-coated steel wire. Under the same conditions, the unit elongation and diameter of the rubber-coated steel wire are smaller. The measurable depth depends on the lowering depth of the submersible pump 4 and the measuring pipe 1 and the length of the rubber-coated steel wire. The measurement depth is greater, so ultra-deep groundwater level measurement can be achieved. At the same time, considering the influence of the elongation of the deep measuring rope on the measurement data, the probe 5 has the function of measuring the well inclination and azimuth, and the depth is corrected using the measurement data.

[0023] In order to better understand the ultra-deep water level measurement system for pumping test in this embodiment, it will be further explained and illustrated below.

[0024] like Figure 6 and Figure 7 As shown, the measurement system of this embodiment includes a groundwater level measurement module and a data correction module, wherein the groundwater level measurement module mainly includes a single-line measuring rope 2, a probe 5, and a pump pipe 3, which can form a closed loop with the groundwater; the data correction module is used to correct the elastic elongation of the measuring rope and the well inclination azimuth.

[0025] Specifically, Figure 1 and Figure 2 As shown, the measuring tube 1 is fixed to one side of the pump pipe 3, so that the measuring tube 1 is lowered into the well together with the pump pipe 3 during the process of lowering the submersible pump 4; the pump pipe 3 located in the hole is a vertical pipe section, and the measuring tube 1 is attached to the outer wall of the pump pipe 3, which is also arranged vertically. The measuring tube 1 and the pump pipe 3 are fixed by multiple flanges 7, so that the two can be easily disassembled. Figure 4 As shown, the flange 7 is provided with a slot 19, the measuring tube 1 is inserted into the reserved slot 19, and is tied and fixed with the pump tube 3. The slots 19 are symmetrically arranged on both sides of the flange 7, one side of the slot 19 is used to clamp the measuring tube 1, and the other side of the slot 19 is used to clamp the cable 8 of the submersible pump 4, and the cable 8 is connected to the control cabinet 17. The connection surface of the flange 7 is provided with a groove for installing a sealing O-ring.

[0026] like Figure 1 As shown, the pipe section of the submersible pump 4 extending out of the hole is a horizontal section, which has a water outlet 16 and is equipped with a valve 14 and a flow meter 15. The size, pumping capacity, and lift of the submersible pump 4 are selected according to actual needs.

[0027] One end of the single-line measuring rope 2 is connected to the probe 5, and the end extends into the measuring tube 1 for a certain length. A plugging component is installed at the bottom of the measuring tube 1. The plugging component can be a wooden plug, a rubber plug, etc. to prevent the probe 5 from protruding. Figure 3As shown, a plurality of through holes 18 are distributed on the bottom pipe section of the measuring pipe 1, and the through holes 18 can be evenly distributed around the measuring pipe 1; the probe 5 is inserted into the pipe section at a position higher than the measuring pipe 1 where the through holes 18 are provided. By providing the through holes 18 on the measuring pipe 1, it can be ensured that groundwater enters the measuring pipe 1, and the impact of the falling impact of the seepage water on the groundwater level can be reduced.

[0028] In a feasible implementation, the measuring pipe 1 is a PVC pipe, which has the advantages of being light, economical, and easy to operate. Since the ultra-deep water level measurement system for pumping test in this embodiment is used for deep water level measurement, the required measuring pipe 1 is relatively long, so the measuring pipe 1 is formed by splicing multiple sections, and the measuring pipes 1 are connected by couplings 6 and fixed by glue to ensure that the inner wall of the measuring pipe 1 is smooth and flat without steps, and the measuring pipe 1 remains straight as a whole.

[0029] The single-line measuring rope 2 is made of rubber-coated steel wire, which has the advantages of small diameter, small elongation, and high tensile strength. According to the different measurement depths and the complexity of the hole, different specifications such as 2~10mm and different lengths such as 300~1000m can be used. Among them, the maximum load-bearing capacity of the 10mm specification can reach 500Kg. Figure 1 As shown, the single-line measuring rope 2 is wound on the electric winch 10 , one end of the single-line measuring rope 2 is connected to the probe 5 , and the other end is connected to the wiring clamp 13 on the pump pipe 3 through the loop closing line 12 .

[0030] like Figure 1 As shown, the electric winch 10 is installed on the upper side of the orifice device 9, and the orifice device 9 is made of a water well or geothermal well casing, and is connected and fixed to the surface casing by a thread. The orifice device 9 is an existing structure, which is provided with a device body and an opening. The device body can adopt different specifications and sizes such as 168mm, 244.5mm, 273mm, 325mm, 339.7mm, 500mm, etc. according to actual conditions; the opening is adapted to the orifice facility, the reserved height of the pump pipe 3, etc., to facilitate the installation of the electric winch 10 and the measuring pipe 1.

[0031] The electric winch 10 is equipped with a depth sensor 11, which is used to detect the length of the measuring rope. At the same time, the probe 5 has the function of measuring the well inclination and azimuth, and the water level depth is corrected by measuring the data. Specifically, in one embodiment, Figure 5 As shown, the probe 5 is composed of a wireless fiber optic gyro inclinometer 20, a suspension mechanism 21, and a guide mechanism 22, which are connected by threads and are smaller than the inner diameter of the measuring tube 1. The wireless fiber optic gyro inclinometer 20 is not interfered by magnetic bodies and can accurately measure the well inclination and azimuth. The suspension mechanism 21 is provided with a bearing and can rotate freely. The guide mechanism 22 mainly protects the instrument. The front end is designed to be arc-shaped, which can reduce resistance during the lowering and lifting of the probe 5. It can also be combined with the suspension mechanism 21 and used as a probe 5 alone.

[0032] It should be noted that the suspension mechanism 21 and the guide mechanism 22 are prior art and will not be described in detail here.

[0033] The depth sensor 11 and the electric winch 10 are connected to a control system, which is arranged in a control cabinet 17. The depth sensor 11 feeds back the detected depth information to the control system, and the control system controls the action of the electric winch 10. The action process is realized through two procedures, including: Procedure 1: When the closed loop is disconnected, the motor of the electric winch 10 rotates forward and the probe 5 is lowered; when the loop is closed, the motor stops. Procedure 2: When the loop is closed, the motor rotates reversely and the probe 5 is raised; when the closed loop is disconnected, the motor stops.

[0034] In this embodiment, the traditional double-wire measuring rope is replaced with a rubber-coated steel wire, whose tensile strength far exceeds that of the double-wire measuring rope, and the possibility of measuring accidents such as rope jamming in actual operation is smaller; under the same conditions, the unit elongation and diameter of the rubber-coated steel wire are smaller, and the measurable depth depends on the lowering depth of the submersible pump 4 and the measuring pipe 1 and the length of the rubber-coated steel wire, and the measuring depth is greater. The double-wire measuring rope loop is transformed into a single-wire measuring rope 2-pump pipe 3-groundwater loop, and even if the single-wire measuring rope 2 is damaged or there is backflow water, seepage, or condensation water, it will not be triggered by mistake.

[0035] The probe 5 of this embodiment can be used in combination of three parts, or in combination of two parts, namely, the suspension mechanism 21 and the guide mechanism 22, according to actual conditions.

[0036] The electric winch 10 of this embodiment can be automatically controlled to lower and stop the probe 5; the depth sensor 11 is used to automatically measure the depth; since the measuring rope has a large deadweight during ultra-deep water level measurement, this embodiment considers the influence of the elastic elongation of the measuring rope and corrects the measurement data. In addition, a wireless fiber optic gyro inclinometer is used to correct the measured depth using well inclination and azimuth data.

[0037] Therefore, this embodiment overcomes the defects of the prior art such as easy false triggering, easy damage and circuit breaking, weak tensile strength, and insufficient measurement depth of the double-wire measuring rope circuit. At the same time, the measurement data is corrected using the inclinometer data and the elastic elongation value of the measuring rope. The measurement accuracy is high, and automatic measurement of ultra-deep groundwater levels above 400m can be realized in pumping tests.

[0038] Embodiment 2: This embodiment provides an ultra-deep water level measurement method for a pumping test, using the measurement system described in Example 1. Fig. 9 As shown, the following steps are included: S1: After the hydrological well, geothermal well or coal mine hydrological observation well is completed, the measuring pipe 1 is lowered into the well together with the submersible pump 4 and the pump pipe 3. The measuring pipe 1 is connected with the coupling 6 and gradually extends to the orifice. The measuring pipe 1 is inserted into the groove 19 of the flange 7 of the pump pipe 3.

[0039] S2: Install the orifice device 9 and adjust the opening position. The measuring tube 1 passes through the reserved hole at the top of the orifice device 9, and the pump tube 3 passes through the side.

[0040] S3: The electric winch 10 is installed on the upper side of the orifice device 9, and the position is adjusted so that the probe 5 can smoothly enter the measuring pipe 1 and be centered, and is firmly fixed.

[0041] S4: Install the depth sensor 11 on the electric winch 10 , and connect the electric winch 10 , the depth sensor 11 and the control cabinet 17 .

[0042] S5: After all the equipment is installed and debugged, the submersible pump 4 and the procedure 1 are started to start the water pumping test. At this time, the closed loop is disconnected, the electric winch 10 rotates forward, and the probe 5 is lowered.

[0043] S6: After the probe 5 comes into contact with the groundwater entering the measuring pipe 1, the single-line measuring rope 2, the probe 5, the groundwater and the pump pipe 3 form a closed loop, and the electric winch 10 stops working.

[0044] S7: When the water level drops, the closed loop is disconnected again, and the electric winch 10 is restarted to lower the probe 5. By closing and disconnecting the loop, the start and stop of the electric winch 10 are controlled, thereby achieving uninterrupted measurement of the dynamic water level depth.

[0045] S8: After the water level stabilizes, turn off the submersible pump 4 and start procedure 2. At this time, the circuit is closed, the electric winch 10 reverses, and the probe 5 rises. After the probe 5 leaves the groundwater, the single-line measuring rope 2, the probe 5, the groundwater, and the pump pipe 3 form a circuit break, and the electric winch 10 stops working. When the water level rises, the circuit is closed again, and the electric winch 10 restarts to lift the probe 5. By closing and opening the circuit, the start and stop of the electric winch 10 are controlled, thereby realizing uninterrupted measurement of the dynamic water level depth until the water level is restored to stability.

[0046] S9: Figure 8 As shown, the depth sensor 11 and the gyro inclinometer 20 measure the measuring line length L, the well inclination angle θ, and the azimuth angle α according to the set time nodes and measurement intervals, and transmit the measurement data to the control cabinet 17.

[0047] According to the formula , and obtain the actual length S of the single-line measuring rope 2 after elastic stretching.

[0048] According to the well inclination angle θ and azimuth angle α measured by the gyro inclinometer 20 and the formula , and obtain the corrected groundwater level depth H.

[0049] Specifically, the measurement and data correction process of the elongation value of the measuring rope is as follows: ; ; ; ; ; In the above formula: S represents the length of the extended measuring rope, L represents the original measuring rope length (including the probe length), that is, the data measured by the depth sensor 11, Indicates the total elongation of the single-line measuring rope 2, Indicates the elongation of the single-line measuring rope 2 under its own weight, It represents the elongation of the single-line measuring rope 2 under the pulling force of the probe 5, ρ represents the unit mass density of the single-line measuring rope 2, g represents the gravitational acceleration, E represents the Young's modulus, w represents the weight of the probe 5, and A represents the cross-sectional area of ​​the single-line measuring rope 2.

[0050] The correction process of groundwater level depth is: The top of the gyro inclinometer 20 is connected to the single-line measuring rope 2, which is lowered into the well along the measuring pipe through the single-line measuring rope 2. The gyro inclinometer 20 is set to measure the well inclination angle θ and the azimuth angle α every 1m, and the measurement data is sent to the control cabinet 17, and the dynamic water level depth is corrected according to the minimum curvature method.

[0051] ; ; .

[0052] In the above formula: represents the total bending angle of the wellbore at point i, represents the well inclination angle at point i, It represents the well inclination angle of the previous point at point i in the wellbore. represents the azimuth of the wellbore at point i, represents the azimuth of the previous point at point i in the wellbore, represents the correction coefficient of the wellbore at point i, represents the corrected groundwater level depth of the well at point i, It represents the depth of groundwater level after correction of the previous point position at wellbore i. Indicates the length of the measuring rope between two adjacent points.

[0053] This embodiment uses the inclination measurement data and the elastic elongation value of the measuring rope to correct the measurement data at the same time, and the measurement accuracy is high.

[0054] Embodiment 3: This embodiment is based on the measurement system of Embodiment 1 and is applied in a water pumping test of a mid-deep geothermal well as follows: The final hole depth of a medium-deep geothermal well is 2050m, the static water level is 78.97m deep, and the pumping test uses a 200QJ20-450 / 34 submersible pump with a rated flow of 20 m 3 / h, head 450m, submersible pump 450m deep. During the pumping process, the measuring pipe is lowered into the well together with the submersible pump. The measuring pipe is connected in sections with coupling glue, fixed with the pump pipe and gradually extended to the orifice. The single-line measuring rope uses a single-line rubber-coated steel wire with a diameter of 4mm. The length of the measuring rope is measured in advance and marked. One end of the single-line measuring rope is connected to the probe, and the other end is connected to the pump pipe through a loop closing line.

[0055] The pumping time of this application lasted for 20.5 hours, the water level recovery observation time was 12 hours, and the maximum dynamic water level was measured at a depth of 429.60m, successfully completing the pumping test task.

[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultra-deep water level measurement system for pumping test, characterized in that: include: The groundwater level measurement module includes a single-line measuring rope, a probe and a pump pipe. One end of the single-line measuring rope is connected to the probe. The probe has a built-in gyro inclinometer and has the function of measuring the well inclination and azimuth. The pump pipe is connected to the other end of the single-line measuring rope through a loop closed line. After the probe contacts the groundwater, the single-line measuring rope, the probe, the pump pipe and the groundwater form a closed loop. The data correction module is used for correcting the elastic elongation of the measuring rope and the well inclination and azimuth. The measuring rope length output from the groundwater level measurement module is used to correct the elongation of the measuring rope; the well inclination and azimuth output from the groundwater level measurement module are used to correct the well inclination; and finally the corrected groundwater level depth is output.

2. The ultra-deep water level measurement system for pumping test according to claim 1, characterized in that: A measuring tube is fixed on one side of the pump tube, and one end of the single-line measuring rope connected to the probe extends into the measuring tube.

3. The ultra-deep water level measurement system for pumping test according to claim 2, characterized in that: A plugging component is installed at one end of the measuring pipe, and a pipe section of the measuring pipe close to the plugging component is provided with a plurality of through holes for groundwater to enter the measuring pipe.

4. The ultra-deep water level measurement system for pumping test according to claim 1, characterized in that: The single-line measuring rope is wound on an electric winch, and a depth sensor is installed on the electric winch. The depth sensor is used to detect the length of the measuring rope.

5. The ultra-deep water level measurement system for pumping test according to claim 4, characterized in that: The depth sensor and the electric winch are connected to a control system, and the control system is used to control the action of the electric winch according to the closed loop state.

6. An ultra-deep water level measurement system for pumping test according to any one of claims 1 to 5, characterized in that: The single-line measuring rope is a rubber-coated steel wire.

7. The ultra-deep water level measurement system for pumping test according to claim 2, characterized in that: The measuring tube is a PVC tube; The measuring pipe is spliced ​​by a plurality of pipe sections, and the spliced ​​parts of adjacent pipe sections are connected by couplings.

8. A method for measuring ultra-deep water level for pumping test, characterized in that: A measurement system as claimed in any one of claims 1 to 7, comprising: The measuring pipe is lowered into the well along with the pump pipe during the submersible pump lowering process, and the single-line measuring rope with the probe is lowered into the measuring pipe to contact the static water level; Turn on the submersible pump connected to the pump pipe and start the water pumping test; at this time, the closed circuit is disconnected, and the electric winch drives the probe to be lowered; after the probe contacts the groundwater, the single-line measuring rope, the probe, the groundwater, and the pump pipe form a closed circuit, and the electric winch stops working; When the water level drops, the closed circuit is disconnected again, and the electric winch is restarted to lower the probe to continuously measure the dynamic water level depth; After the water level stabilizes, turn off the submersible pump; at this time, the circuit is closed, and the electric winch drives the probe to rise; after the probe is separated from the groundwater, the single-line measuring rope, the probe, the groundwater, and the pump pipe form a short circuit, and the electric winch stops working; when the water level rises, the circuit is closed again, and the electric winch restarts to lift the probe to continuously measure the dynamic water level depth; until the water level is restored to stability.

9. The method for measuring ultra-deep water level for pumping test according to claim 8, characterized in that: The depth sensor and gyro inclinometer measure the single-line measuring rope, well inclination and azimuth according to the set time nodes and measurement intervals, calculate the actual length of the single-line measuring rope after elastic extension; and calculate the corrected groundwater level depth based on the well inclination and azimuth.

10. The ultra-deep water level measurement method for pumping test according to claim 9, characterized in that: The actual length of the single-line measuring rope after elastic extension is equal to the sum of the original measuring rope length and the total extension of the single-line measuring rope; The gyro inclinometer measures the well inclination angle and azimuth angle once at every set interval, and corrects the dynamic water level depth according to the minimum curvature method.

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