A geothermal well deep water level measuring device

Abstract

The utility model belongs to geothermal well measurement technical field, concretely relates to a kind of geothermal well deep water level measuring device, including outer tube, inner tube, water level alarm and pressure controller;Outer tube bottom end is closed, inner tube bottom end is open, both vertical nesting arrangement;Outer tube side wall is equipped with fender, and its lower end is equipped with magnetic suction sealing assembly;Outer tube side wall is equipped with water level alarm, and its top is connected positioning traction line;Inner tube top end is sealed communication with pressure reducing valve by connecting pipe, and pressure reducing valve can apply constant pressure to inner tube.This device is based on hydrostatic pressure balance and volume conservation principle and calculates geothermal well water level, and the protection of detection component is realized by nested pipe body and magnetic suction sealing structure, high-temperature medium and impurity interference are isolated, above 100m deep hole high-temperature geothermal well is adapted, with the advantages of high precision, strong anti-interference, stable structure, convenient operation, etc., suitable for geothermal well water level dynamic monitoring.

Description

Technical Field

[0001] This utility model belongs to the field of geothermal well measurement technology, specifically relating to a deep water level measurement device for geothermal wells. Background Technology

[0002] Geothermal resources, as a clean and renewable energy source, rely on precise monitoring of reservoir parameters for efficient development. Among these parameters, the geothermal well water level is a key dynamic parameter reflecting reservoir pressure, evaluating resource potential, and guiding extraction and reinjection. Typical geothermal wells can reach depths of hundreds to thousands of meters, with fluid temperatures often ranging from 90°C to over 150°C. Furthermore, the fluids may contain complex components such as minerals and gases, creating a harsh monitoring environment characterized by high temperature, high pressure, numerous impurities, and strong interference.

[0003] Existing geothermal well water level measurement technologies mostly employ electronic sensor probes that directly contact the well medium for measurement. However, in the special application environment of deep, high-temperature geothermal wells, the sensor probes need to directly contact the high-temperature or even boiling geothermal fluids. Long-term operation can easily lead to sensor performance drift, encapsulation failure, or permanent damage. Furthermore, the fluids in deep wells may contain turbulence, bubbles, and solid particle impurities. Direct contact with the sensor probes can severely affect their measurement accuracy and reduce the reliability of the measurement data. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide a deep geothermal well water level measurement device that enables non-contact indirect measurement, avoids the risk of sensor drift and failure, eliminates interference from turbulence, bubbles and solid particles on the measurement, improves the accuracy and stability of deep-hole high-temperature geothermal well water level measurement, and enhances the reliability of the measurement data.

[0005] The technical solution of this utility model is: A deep water level measuring device for geothermal wells, comprising: The measuring sleeve includes an inner tube and an outer tube that are coaxially sleeved together, and a pipe fixing component that seals and connects the top of the inner tube and the outer tube. There is a gap between the outer tube and the inner tube and the bottom is connected. The outer tube is provided with at least one water inlet, and a water-blocking component for opening and closing the water inlet is provided at the water inlet. A pressure regulating assembly includes a connecting pipe and a pressure controller. One end of the connecting pipe is inserted through the pipe fixing member and located inside the inner pipe, and the other end is connected to the pressure controller. The measuring component includes a water level alarm and a traction line. The traction line is inserted through the pipe fixing component, with one end extending into the outer pipe and fixed to the water level alarm, and the other end extending out of the outer pipe and detachably connected to the pipe fixing component.

[0006] Preferably, there are two or more water inlets, and the two or more water inlets have the same vertical height on the outer pipe, and each water inlet is provided with a corresponding water baffle.

[0007] Preferably, the outer tube is a tube body closed at the bottom, the inner tube is a tube body coaxial with the outer tube and open at the bottom, the bottom end of the inner tube and the bottom end of the outer tube are provided with a communication gap, the height of the water inlet from the bottom end of the outer tube is 0.5m~1m, and the height of the communication gap is 0.2m~0.5m.

[0008] Preferably, the diameter ratio of the inner tube to the outer tube is 0.3 to 0.7.

[0009] Preferably, the water-blocking component includes a water-blocking plate, a first magnetic block, and a second magnetic block. The water-blocking plate is an elastic sealing plate located inside the outer tube and at the water inlet. One end of the water-blocking plate is movably connected to the side wall of the outer tube, and the other end is fixed to the first magnetic block. The second magnetic block is embedded in the side wall of the outer tube and is used to attract the first magnetic block to achieve the sealing of the water inlet.

[0010] Preferably, elastic sealing gaskets are provided on the sidewalls of the baffle plate opposite to the water inlet and on the periphery of the water inlet.

[0011] Preferably, both the outer tube and the inner tube are composed of multiple tube sections connected by threaded sealing, and the length of a single tube section is 1.5m to 2.5m.

[0012] Preferably, the cross-sectional ratio between the inner tube and the outer tube is determined according to the following formula: , In the formula, The cross-sectional area of ​​the inner tube is... The cross-sectional area of ​​the outer tube; The height by which the water level drops after the pressure is increased in the inner pipe. The height by which the water level in the outer pipe rises after the pressure in the inner pipe is increased.

[0013] Compared with the prior art, the deep water level measuring device for geothermal wells of this utility model has the following advantages: This device vertically inserts the outer tube into the geothermal well via a measuring sleeve. Utilizing a water-blocking component that opens the inlet upon water flow impact and closes after pressure balance within the chamber, it isolates high-temperature geothermal fluid and impurities from entering the measuring chamber, preventing the detection components from being directly exposed to harsh environments. A pressure regulating component applies controllable pressure to the inner tube, pushing the fluid from the inner tube to the outer tube. Based on the principles of hydrostatic pressure balance and volume conservation, the measuring component detects the rise in water level within the outer tube, achieving non-contact indirect measurement. This avoids the risks of sensor drift and failure, and eliminates interference from turbulence, air bubbles, and solid particles, significantly improving the accuracy and stability of water level measurement in deep high-temperature geothermal wells exceeding 100 meters in depth, making it suitable for long-term dynamic monitoring under complex operating conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the geothermal well water level measuring device of this utility model; Figure 2 This is a schematic diagram of the geothermal well water level measuring device under pressurized conditions according to this utility model; Figure 3 This is a schematic diagram of the structure of the water baffle plate on the outer pipe side wall of this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Ground surface; 2. Geothermal well wall; 3. Outer pipe; 4. Inner pipe; 5. Water level alarm; 6. Traction line; 7. Water baffle; 8. Pipe fastener; 9. Connecting pipe; 10. Pressure controller; 11. Pressurized airflow direction; 12. Initial water level; 13. Inner pipe water level after pressurization; 14. Outer pipe water level after pressurization; 15. Magnetic sealing assembly. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0019] See Figures 1 to 3As shown, in order to avoid the risk of sensor drift and failure during the measurement process, eliminate the interference of turbulence, bubbles and solid particles on the measurement, improve the accuracy and stability of deep-hole high-temperature geothermal well water level measurement, and ensure the reliability of measurement data, this embodiment provides a deep geothermal well water level measurement device, including: a measuring casing, a water-blocking component, a pressure regulating component, and a measuring component.

[0020] The measuring casing includes an outer pipe 3, an inner pipe 4, and a pipe fixing component 8. The outer pipe 3 is a closed-end pipe with at least one water inlet on its side wall, the height of which is 0.5m to 1m from the bottom of the outer pipe 3. The outer pipe 3 is vertically inserted into the geothermal well along the direction of the well wall 2. The inner pipe 4 is coaxial with the outer pipe 3 and open at its bottom. The inner pipe 4 is inserted into the outer pipe 3 with a gap between their pipe walls, and the bottom of the inner pipe 4 and the bottom of the outer pipe 3 have a communication gap with a height of 0.2m to 0.5m. The top ends of both the outer pipe 3 and the inner pipe 4 are sealed and fixed to the pipe fixing component 8, which is located at the wellhead of the geothermal well and fixed to the ground 1. A water-blocking component is located at the water inlet of the outer pipe 3, used to open the water inlet when impacted by water flow and to close the water inlet after the pressure in the cavities of the outer pipe 3 and the inner pipe 4 reaches equilibrium. The pressure regulating assembly, mounted on the pipe fastener 8, applies pressure to the inner pipe 4 after the inlet is closed, thereby pushing the fluid in the inner pipe 4 towards the outer pipe 3. The measuring end of the measuring assembly is located inside the outer pipe 3, and is used to detect the rise in water level in the outer pipe 3 after the fluid enters from the inner pipe 4.

[0021] Furthermore, the diameter ratio of the inner pipe 4 to the outer pipe 3 should preferably be set to 0.3~0.7: if the diameter ratio is less than 0.3, the annular space inside the outer pipe 3 is too large, and the rise in the water level of the outer pipe 3 is not significant when the water level in the inner pipe 4 drops, resulting in low measurement sensitivity; if the diameter ratio is greater than 0.7, the gap between the inner pipe 4 and the outer pipe 3 is too small, making processing and installation difficult and prone to blockage by impurities. Generally, the diameter ratio of the inner pipe 4 to the outer pipe 3 should be selected as 0.5, that is, at this time the cross-sectional area of ​​the inner pipe 4 is about 1 / 4 of the cross-sectional area of ​​the outer pipe 3, which can achieve a three-fold amplification of the height of the drop in water level in the inner pipe 4 and the height of the rise in water level in the outer pipe 3, making it easier to accurately infer the water level in the inner pipe 4 from the change in the water level in the outer pipe 3, thereby improving the measurement sensitivity and accuracy.

[0022] The pressure regulating assembly includes a connecting pipe 9 and a pressure controller 10. One end of the connecting pipe 9 is inserted through the pipe fixing member 8 and communicates with the inner pipe 4. The other end extends out of the pipe fixing member 8 and is connected to the pressure controller 10. The pressure controller 10 includes a booster cylinder and a pressure reducing valve. The output port of the booster cylinder is communicated with the inner pipe 4 through the connecting pipe 9. The pressure reducing valve is installed on the connecting pipe 9 and can apply a controllable constant pressure to the inner cavity of the inner pipe 4 along the pressurized airflow direction 11.

[0023] Furthermore, the measuring components include a water level alarm 5 and a traction line 6. One end of the traction line 6 passes through the pipe fixing member 8 and is fixed to the water level alarm 5. The other end extends out of the pipe fixing member 8 and is detachably connected to the connecting buckle on the pipe fixing member 8, or extends out of the pipe fixing member 8 and is connected to an external winding device. By adjusting the winding of the traction line 6, the position of the water level alarm 5 in the outer pipe 3 can be effectively adjusted, which is convenient for adaptive adjustment according to the actual measurement environment.

[0024] Furthermore, there can be two or more water inlets, and when there are two or more water inlets, they are at the same vertical height on the outer pipe 3, and each water inlet is provided with a corresponding water baffle.

[0025] See Figure 1 and Figure 3 As shown, the water-blocking component further includes a water-blocking plate 7 and a magnetic sealing assembly 15. The magnetic sealing assembly 15 includes a first magnetic block and a second magnetic block. The water-blocking plate 7 is an elastic sealing plate located inside the outer pipe 3 and at the water inlet. One end of the water-blocking plate 7 is movably connected to the side wall of the outer pipe 3, and the other end is fixed to the first magnetic block. The second magnetic block is embedded in the side wall of the outer pipe 3 and is used to attract the first magnetic block. The water-blocking plate 7 is pressed against the water inlet by the attraction of the first magnetic block and the second magnetic block. The deformation of the water-blocking plate 7 tightly fits the side wall of the water inlet to achieve the sealing of the water inlet. When the water-blocking plate 7 is impacted by the water flow, the water inlet is opened. After the pressure in the inner cavity of the outer pipe 3 and the inner pipe 4 reaches equilibrium, the magnetic attraction force of the magnetic sealing assembly 15 achieves a reset seal. At this time, the water level in the inner pipe 4 and the outer pipe 3 is at a horizontal state, which is the initial water level 12. Then, pressure is applied to the inner pipe 4 through the pressure regulating component, causing the water level in the inner pipe 4 to drop and the water level in the outer pipe 3 to rise until the water level alarm 5 contacts the water level in the outer pipe 3. At this time, if... Figure 1 and Figure 2 As shown, the inner pipe 4 has a pressurized water level, and the outer pipe 3 has a pressurized water level.

[0026] Furthermore, elastic sealing gaskets are provided on the side wall of the baffle plate 7 opposite to the water inlet, as well as on the corresponding periphery of the water inlet.

[0027] Furthermore, both the outer pipe 3 and the inner pipe 4 are segmented pipe bodies with threaded seals and splices, each with a single section length of 1.5m to 2.5m. Preferably, the single section length of the inner pipe 4 and the outer pipe 3 is set to 2m. The advantages of this range are: a 2m single section length facilitates manual / small equipment handling, hoisting, and downhole docking, adapting to geothermal well construction conditions; compared to longer pipe sections, it avoids deformation problems during transportation and construction, facilitates adaptation to conventional processing and transportation, and a 2m single section facilitates the processing of the inlet on the first pipe section, while also making the disassembly and maintenance of subsequent pipe sections more flexible. In addition, the total length of both the outer pipe 3 and the inner pipe 4 is greater than 100m.

[0028] Furthermore, during the measurement phase, the inner tube 4 and the outer tube 3 satisfy the following pressure balance relationship: , in, The pressure applied to the inner tube by the pressure controller. This represents the atmospheric pressure of the outer tube. The density of the geothermal medium, It is the acceleration due to gravity. The height by which the water level drops after increasing the pressure in the inner pipe. The height by which the water level in the outer pipe rises after the pressure in the inner pipe is increased.

[0029] The inner and outer tubes are coaxially arranged, and the cross-sectional ratio between the inner and outer tubes satisfies the volume conservation equation: , In the formula, Let be the cross-sectional area of ​​the inner tube. This represents the cross-sectional area of ​​the outer tube; The height by which the water level drops after increasing the pressure in the inner pipe. The height by which the water level in the outer pipe rises after the pressure in the inner pipe is increased.

[0030] Furthermore, based on the aforementioned pressure balance equation and volume conservation relationship, and considering the preset distance between the probe of the water level alarm 5 and the wellhead... It can obtain the depth of the actual water level from the wellhead in a geothermal well. H : .

[0031] In this embodiment, the geothermal well water level measuring device first assembles the inner and outer pipes 3 according to the designed length and lowers them into the geothermal well, fixing them at the wellhead. During the lowering process, the inlet opens under the impact of water flow. After the water pressure in the inner and outer pipes 3 is balanced with the water pressure in the well, the magnetic sealing component 15 and the baffle plate 7 work together to automatically seal the inlet. Then, a controllable pressure is applied to the inner pipe 4. Based on the ratio of the cross-sectional areas of the inner and outer pipes 3, the water level in the outer pipe 3 rises to a measurable height. Finally, combined with the initial water level 12 height measured by the water level alarm 5, the actual water level depth of the geothermal well is further calculated, completing a full measurement.

[0032] The geothermal well water level measuring device in this embodiment protects the detection components through a nested pipe structure and magnetic sealing design, isolating them from interference from high-temperature media and impurities in the well. Combining the principles of hydrostatic pressure balance and volume conservation, it achieves indirect high-precision measurement of water level. The device has a stable overall structure, is easy to operate, and has strong adaptability. It can be effectively applied to the dynamic monitoring of water level in deep high-temperature geothermal wells over 100 meters deep, providing accurate water level data support for the sustainable development of geothermal resources.

[0033] Compared with the prior art, the present invention has the following technical advantages: 1. High measurement accuracy and strong anti-interference: Through the combined design of the inner pipe 4 pressurization regulation and the outer pipe 3 water baffle 7 sealing and guiding, interference from other equipment such as water pump cables and water pipes in the geothermal well is isolated. Combined with the principle of hydrostatic pressure balance and volume conservation, indirect calculation is achieved, avoiding the shaking and drift error of the sensor directly deployed under deep hole conditions, and greatly improving the accuracy of water level measurement.

[0034] Its core principle is as follows: the inlet opens under the impact of water flow, so that the bottom of the inner pipe 4 and the outer pipe 3 are connected to the water level in the well; when the pressure in the inner pipe 4 and the outer pipe 3 is balanced, the magnetic sealing component 15 and the baffle plate 7 work together to automatically seal the inlet, forming a closed measurement system; then, pressure is applied through the inner pipe 4, and the water level change in the inner pipe 4 is amplified to the outer pipe 3 by using the ratio of the cross-sectional areas of the inner pipe 4 and the outer pipe 3, so as to realize the accurate amplification and indirect measurement of the water level change, and ensure the stability and accuracy of the measurement as a whole.

[0035] 2. Excellent structural adaptability and convenient construction: The pipeline adopts a segmented structure with 2m sections of threaded sealing splicing. The size of each section is moderate, which facilitates on-site hoisting, docking, and lowering of geothermal wells. The total length can be flexibly adapted to the working conditions of geothermal wells deeper than 100 meters. The pipeline fixing components 8 ensure stable locking at the wellhead. The high rigidity of the pipe body prevents entanglement with water pump cables and water pipes. This structure, through modular splicing, ensures both overall coaxiality and sealing, while reducing the difficulty of transporting and constructing long pipe bodies. It can be quickly assembled and lowered on-site, greatly improving construction efficiency and adaptability to working conditions.

[0036] 3. Controllable operation, safe and efficient: The pressure controller 10 enables controllable pressurization of the inner tube 4, and the positioning traction line 6 and water level sensor trigger the liquid level alarm. No manual well exploration is required, reducing the risk of deep hole operation. The measurement process is simple and the response is fast, enabling rapid, accurate and safe monitoring of geothermal well water level.

[0037] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A device for measuring the deep water level in a geothermal well, characterized in that, include: The measuring sleeve includes an inner tube and an outer tube that are coaxially sleeved together, and a pipe fixing component that seals and connects the top of the inner tube and the outer tube. There is a gap between the outer tube and the inner tube and the bottom is connected. The outer tube is provided with at least one water inlet, and a water-blocking component for opening and closing the water inlet is provided at the water inlet. A pressure regulating assembly includes a connecting pipe and a pressure controller. One end of the connecting pipe is inserted through the pipe fixing member and located inside the inner pipe, and the other end is connected to the pressure controller. The measuring component includes a water level alarm and a traction line. The traction line is inserted through the pipe fixing component, with one end extending into the outer pipe and fixed to the water level alarm, and the other end extending out of the outer pipe and detachably connected to the pipe fixing component.

2. The geothermal well deep water level measuring device according to claim 1, characterized in that, There are two or more water inlets, and the two or more water inlets have the same vertical height on the outer pipe. Each water inlet is provided with a corresponding water baffle.

3. The geothermal well deep water level measuring device according to claim 2, characterized in that, The outer tube is a tube body closed at the bottom, and the inner tube is a tube body coaxial with the outer tube and open at the bottom. The bottom end of the inner tube and the bottom end of the outer tube are provided with a communication gap. The height of the water inlet from the bottom end of the outer tube is 0.5m to 1m, and the height of the communication gap is 0.2m to 0.5m.

4. The geothermal well deep water level measuring device according to claim 1, characterized in that, The diameter ratio of the inner tube to the outer tube is 0.3 to 0.

7.

5. The geothermal well deep water level measuring device according to claim 1, characterized in that, The water-blocking component includes a water-blocking plate, a first magnetic block, and a second magnetic block. The water-blocking plate is an elastic sealing plate located inside the outer tube and at the water inlet. One end of the water-blocking plate is movably connected to the side wall of the outer tube, and the other end is fixed to the first magnetic block. The second magnetic block is embedded in the side wall of the outer tube and is used to attract the first magnetic block to achieve the sealing of the water inlet.

6. The geothermal well deep water level measuring device according to claim 5, characterized in that, Elastic sealing gaskets are provided on the side wall of the baffle plate opposite to the water inlet, as well as on the corresponding periphery of the water inlet.

7. The geothermal well deep water level measuring device according to claim 1, characterized in that, Both the outer tube and the inner tube are composed of multiple tube sections connected by threaded seals, and the length of a single tube section is 1.5m to 2.5m.

8. The geothermal well deep water level measuring device according to claim 1, characterized in that, The cross-sectional ratio between the inner tube and the outer tube is determined according to the following formula: ， In the formula, The cross-sectional area of ​​the inner tube is... The cross-sectional area of ​​the outer tube; The height by which the water level drops after the pressure is increased in the inner pipe. The height by which the water level in the outer pipe rises after the pressure in the inner pipe is increased.

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