Seismic observation device for double drainage systems of self-flow well

Abstract

The utility model discloses a seismological observation device for double discharge systems of an autoflow well. The seismological observation device comprises a main well pipe, an auxiliary well pipe, an overground discharge pipeline, an underground standby discharge pipeline and a discharge pool, the main well pipe and the auxiliary well pipe are connected through a communicating pipe inclining by 30-45 degrees. An organic glass side pressure pipe is arranged on the overground drainage pipeline close to the main well pipe, and scales are marked on the side pressure pipe; a flow control valve is mounted on the overground drainage pipeline at the rear end of the side pressure pipe, a flowmeter is mounted on the overground drainage pipeline at the rear end of the flow control valve, and the overground drainage pipeline at the rear end of the flowmeter is lifted; a water conduit is arranged on the ground drainage pipeline; the tail end of the water conduit is provided with one or more faucets as a sampling port or a water receiving port of the gas removal and collection device; the tail-end overground drainage pipeline faces upwards at a small angle, and the tail-end overground drainage pipeline extends out of the well house and is directly discharged into the drainage pool. According to the utility model, a plurality of design details are favorable for stabilizing water level observation data and reducing interference factors, meanwhile, the problem of underground drainage is solved by a double drainage system, the risk of cutoff is dealt with in advance, and the observation service life of the self-flow well can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of underground fluid observation, in particular to a seismic observation device for a double-drainage system of an artesian well. Background Art

[0002] Groundwater level and water temperature monitoring is the most common and mature observation technology in earthquake underground fluid observation technology. There are more than 500 water level and water temperature observation points in China. Groundwater level observation can be divided into dynamic water level observation of artesian wells and static water level observation of ordinary pressure wells. The observation wells for earthquake monitoring usually observe underground pressure water. When the pressure water level is higher than the ground, an artesian well can be formed. The well pipe is extended above the ground to control the water head height, and the well water is discharged from the discharge pipe. Since pressure water can carry deep crust elements and even mantle gas information, it is more important for earthquake analysis and prediction than static water level wells.

[0003] Among the more than 500 earthquake observation wells in China, only less than 60 are artesian wells. With the increase of groundwater exploitation, more artesian wells are facing the risk of water level decline or even dry-up. For earthquake prediction and forecasting, continuous and stable data monitoring background information is crucial. Once the artesian well is dry, its observation conditions will change, and the historical data and earthquake cases accumulated over the years will lose their meaning. Therefore, maintaining the artesian well's artesian conditions and rationally designing the drainage system are the key to ensuring data quality and continuing research.

[0004] Compared with ordinary static water level observation wells, the underground fluid observation system of artesian wells is much more complicated. For example, the design of the discharge pipeline, the flow-limiting head height, the gas collection method for water chemical gas observation, the pressure balance of the degassing water and gas circuits, etc. will directly affect the data quality of each observation method.

[0005] The dynamic water level observation of artesian wells has a different meaning from the static water level. It does not observe the depth of the water level. Because the pressurized water of artesian wells can spray out of the ground by itself, a discharge pipeline must be installed. The discharge flow rate is adjusted by the flow limiting valve on the discharge pipeline, and the height of the water head in the well pipe above the ground relative to the center line of the discharge pipe is the dynamic water level. Therefore, the dynamic water level of an artesian well is a relative observation value, and its value depends on the discharge flow rate. When the flow limiting valve does not move, the water level rises when the groundwater flow rate increases, and the water level drops when the flow rate decreases. Correspondingly, the water temperature observation of an artesian well is not necessarily a change in the temperature of the groundwater itself. The groundwater temperature is relatively high. As the water flows upward to the ground, the water temperature gradually decreases. When the discharge flow rate increases and the flow rate is fast, the underground hot water can reach the water temperature sensor faster, which is manifested as an increase in water temperature, and vice versa. It can be seen that the observation of dynamic water level and water temperature of artesian wells is closely related to flow rate. The size of flow rate not only reflects the change of the outflow volume of pressurized water itself, but is mainly determined by the discharge pipeline and flow limiting valve.

[0006] The design of the discharge pipeline will directly affect the discharge velocity and stability of the artesian well. In general, the discharge pipeline should use pipes with the same diameter as the main well pipe, and the end should not be higher than the front end as much as possible to ensure that in the discharge process, in addition to the flow limiting valve restricting the flow rate, there is no other external force to produce pressure on the front end, thereby affecting the water level change. However, in actual observations, the discharge flow size and actual conditions of each well should be considered to design the discharge pipeline: for example, the flow meter connected in series in the discharge pipeline requires that the rear end of the sensor should be lifted to ensure sufficient water in the instrument pipeline for flow observation; in the artesian well where water chemistry observation is carried out at the same time, the balance between the water inflow of the degassing device and the water level observation should be taken into account, and sometimes the rear end of the discharge pipeline needs to be lifted to ensure the water inflow at the degassing device. The above two types of lifting discharge pipelines are designed to meet the observation needs, but on the other hand, they will have a certain impact on the stability of dynamic water level and water temperature observation.

[0007] When water chemical gas observations are conducted at the same time as the dynamic water level and water temperature of an artesian well, it may also have an impact on the water level. The first is the impact of water chemical simulation observation sampling: simulation observations require sampling at a fixed time every day. If water is released from the middle section of the discharge pipeline during the sampling process, the discharge pressure will drop, causing the dynamic water level to drop. The second is the impact of instrumental air extraction observations: instruments such as radon and mercury need to be evacuated before observation at the hour. Since the interior of the degassing device is a closed environment with no air circulation with the outside world, negative pressure will be generated inside the degassing device during air extraction. This negative pressure will increase the water flow entering the degassing device, thereby affecting the pressure change in the main discharge pipeline and causing a short-term drop in the dynamic water level.

[0008] In summary, underground fluid observation in artesian wells is an important component of earthquake monitoring and prediction, and is of great significance. The design of the drainage system pipeline is the key to the quality of artesian well observation, while water level drop and flow interruption are major risks faced by artesian well observation.

[0009] The simultaneous observation of water level, water temperature and hydrochemical gas in artesian wells is a comprehensive observation system. Each measurement item affects each other. For example, the head height controlled by the flow control valve can affect the gas collection volume of the hydrochemical observation gas collection device. The design of the discharge pipeline and the design of the hydrochemical observation water pipe will affect the stability of the water level data. It is necessary to comprehensively consider various factors to obtain a balanced state in the pipeline design.

[0010] The seismic industry standards DB / T48-2012 (Well Water Level Observation Method) and DB / T20.2-2006 (Specifications for the Construction of Radon and Mercury Stations) describe the design of artesian well discharge pipelines and drainage pipes for degassing devices, but they are limited to the most basic structural relationships. Factors that may affect water level observations in actual observations are not fully considered, and the design of the discharge pipeline is not the optimal choice, or is not applicable to the actual conditions of every artesian well.

[0011] Figure 1 This is a schematic diagram of the main and auxiliary well pipes and the discharge device in the industry standard DB / T48-2012. There are mainly the following problems: 1. The connecting pipe is recommended to be 45 degrees and is located above the discharge pipe, which occupies too much space above the discharge pipe. The dynamic water level observation head must be higher than the connecting pipe, and the observable head range is limited; 2. The space reserved for the discharge pool and the discharge pipe is insufficient. The water level in the discharge will contact the discharge pipe, which will affect the water level data; 3. The discharge pipe does not specify the pipe diameter. The discharge pipe in the schematic diagram is thin, and the adjustable range of the discharge flow is limited. 4. The auxiliary well pipe is used for water level observation. Usually, the water level sensor is located 5m underwater for the best observation depth. The depth of the auxiliary well pipe is not clear in the figure.

[0012] Figure 2 This is a schematic diagram of the artesian well structure in the industry standard DB / T20.2-2006. In the figure, the water diversion pipe is located below the discharge pipe. According to this scheme, connecting and disconnecting the gas collection device to carry out water chemistry observation will have a significant impact on the stability of the water level observation data in the same well. Summary of the invention

[0013] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a seismic observation device with a double leakage system for an artesian well. Its multiple design details are conducive to the stability of water level observation data and reduce interference factors. At the same time, the double leakage system solves the problem of underground leakage, responds to the risk of dry-off in advance, and can effectively extend the observation life of the artesian well.

[0014] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0015] The utility model provides a seismic observation device for a dual-drainage system of an artesian well, comprising a main well pipe, an auxiliary well pipe, an above-ground drainage pipeline, an underground spare drainage pipeline and a drainage pool;

[0016] The main well pipe and the auxiliary well pipe are connected by a connecting pipe inclined at 30°-45°, and one side of the main well pipe is the high end; the main well pipe and the auxiliary well pipe are connected by connecting pipes between the parts located above ground and between the parts located underground, and valves are provided on the underground connecting pipes;

[0017] The aboveground leakage pipeline is connected to the aboveground portion of the main well pipe, and the underground backup leakage pipeline is connected to the underground portion of the main well pipe; the aboveground connecting pipe is located at a higher position than the aboveground leakage pipeline in the main well pipe, and the underground connecting pipe is located at a higher position than the underground backup leakage pipeline in the main well pipe;

[0018] On the ground leakage pipeline, a plexiglass side pressure pipe is installed near the main well pipe, and a scale is marked on the side pressure pipe; a flow control valve is installed on the ground leakage pipeline at the rear end of the side pressure pipe, and a flow meter is installed on the ground leakage pipeline at the rear end of the flow control valve, and the ground leakage pipeline at the rear end of the flow meter is raised;

[0019] A water diversion pipe is set in the middle of the ground drainage pipeline; the water diversion pipe is angled downward, and one or more taps are installed at the end of the water diversion pipe as a sampling port or a water inlet for a gas collection device; the end ground drainage pipeline is angled upward at a small angle, and the end ground drainage pipe extends out of the well house and directly discharges into the drainage pool;

[0020] An organic glass side pressure pipe is installed near the main well pipe on the underground standby leakage pipeline, and a scale is marked on the side pressure pipe; a flow control valve is installed on the underground standby leakage pipeline at the rear end of the side pressure pipe, and the underground standby leakage pipeline at the rear end of the flow control valve is raised and connected to the glass fiber reinforced plastic water storage tank, and an air hole is left on the top of the water storage tank; the underground standby leakage pipeline is connected from the high position of the water storage tank, and a drainage pipe is installed at the bottom of the water storage tank. The water from the leakage well is pumped to the ground by a fully automatic water pump and directly discharged into the leakage pool;

[0021] The spillway is outside the well house, and an underground external drainage pipe is installed at the bottom of the spillway.

[0022] Furthermore, the fully automatic water pump is provided with one main and one backup.

[0023] Furthermore, the diameter of the external drainage pipe is not less than the diameters of the underground backup drainage pipe and the ground drainage pipe.

[0024] Furthermore, the bottom of the auxiliary well pipe is sealed and has a conical bottom.

[0025] Furthermore, the above-ground drainage pipeline is not less than two-thirds of the main well diameter.

[0026] The beneficial effects of the utility model are: 1. The underground backup drainage system effectively copes with the risk of water level drop and flow interruption, and prolongs the observation life of the artesian well;

[0027] 2. The relative position relationship between the main and auxiliary well pipes, connecting pipes and discharge pipes can effectively improve the dynamic range and data stability of water level observation data;

[0028] 3. The design of the upper and lower relationship between the terminal discharge pipe and the water diversion pipe can ensure the water supply of the gas collection device;

[0029] 4. The fully automatic underground water pump can realize automatic switching between main and standby modes to ensure drainage reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the main and auxiliary well pipes and the drainage device in the industry standard DB / T48-2012;

[0032] Figure 2 This is the schematic diagram of the artesian well structure in the industry standard DB / T20.2-2006;

[0033] Figure 3 A structural schematic diagram of a seismic observation device for a double-drainage system of an artesian well provided in Example 1 of the utility model.

[0034] Explanation of the reference numerals in the accompanying drawings: 1. Ground plane; 2. Cement masonry spillway; 3. Well house wall; 4. Terminal ground spillway; 5. Well water level; 6. Ground side pressure pipe; 7. Ground flow control valve; 8. Flow meter; 9. Water diversion pipe; 10. Ground spillway; 11. Fully automatic water pump; 12. Drain pipe; 13. FRP water storage tank; 14. Underground spare spillway; 15. Underground spare flow control valve; 16. Underground side pressure pipe; 17. Connecting pipe; 18. Valve; 19. Auxiliary well pipe; 20. Main well pipe; 21. Basement floor; 22. First floor floor; 23. Second floor floor; 24. Underground external drainage pipe; 25. Spillway; 26. Flow control valve; 27. Side pressure pipe; 28. Filling concrete; 29. ​​Observation wellhead; 30. Casing. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0036] like Figure 3 As shown, this embodiment takes the Wuliying artesian well in Yanqing as an example, and an artesian well double leakage system seismic observation device includes a main well pipe 20, an auxiliary well pipe 19, an above-ground leakage pipeline 10, an underground spare leakage pipeline 14 and a leakage pool 2;

[0037] The main well pipe 20 is the main body of the well formed directly when drilling. The depth of the seismic monitoring well is generally 500m-1000m, so as to reach the local pressure water layer. The diameter of the well pipe is generally 125mm-300mm; the auxiliary well pipe 19 is only configured when the temperature of the artesian well is high or the bubble content is high. It is specially used for water level observation to protect the sensor and improve the quality of water level observation data. The auxiliary well pipe 19 needs to have the same diameter and height as the main well pipe 20.

[0038] The depth of the auxiliary well pipe 19 of this device exceeds 10m, which can better adapt to the linear observation depth range of the sensor. The bottom of the auxiliary well pipe 19 is sealed, and the bottom is designed to be conical for easy installation. The main and auxiliary well pipes 19 are connected by a connecting pipe 17 with a 30°-45° inclination. One side of the main well pipe 20 is the high end, so that the well water in the main well pipe 20 can smoothly enter the auxiliary well pipe 19, and the bubbles remain in the main well pipe 20. The main and auxiliary well pipes 19 are 1m apart. The position of the connecting pipe 17 in the main well pipe 20 must be higher than the leakage pipeline, and should be no less than 20cm, so as to reduce the impact of the leakage water flow on the water level in the auxiliary well pipe 19. The angle of the connecting pipe 17 should not be too large. The industry standard recommends 45°. However, in order to give the main well pipe 20 more space above the connecting pipe 17 to increase the head floating range, the inclination angle of the connecting pipe 17 can be reduced to 30°. A spare connecting pipe 17 is welded at the same height from the ground as the connecting pipe 17 on the same floor of the basement. In order to maintain the observation conditions completely consistent with those before adding the underground drainage pipeline, the spare connecting pipe 17 is in a long-closed state before the underground drainage device is activated.

[0039] In actual use, the auxiliary well pipe 19 is a special well pipe for water level observation, and a water level sensor is deployed; the main well pipe 20 can be equipped with a water temperature sensor. The main well pipe 20 is equipped with a natural gas collection device, and observations of escaping gases and dissolved gases such as mercury, radon, hydrogen, and helium can also be carried out.

[0040] The installation height of the ground discharge pipe 10 is 40cm, which is slightly lower than the 50cm recommended by the industry standard, so as to leave more water head floating range for the upper end. The diameter of the discharge pipe should not be too small, and should be no less than two-thirds of the diameter of the main well pipe 20. A plexiglass side pressure pipe is installed near the main well pipe 20. The scale is marked on the side pressure pipe. The center line of the discharge pipe is taken as the starting point of 0. The side pressure pipe is used for artesian well water level calibration. A flow control valve is installed at the rear end of the side pressure pipe. The flow control valve is adjusted to stabilize the water head in the well pipe at an appropriate height. A flow meter 8 is installed at the rear end of the flow control valve. The flow meter 8 is an important auxiliary observation equipment for observing the water level and water temperature of the artesian well. According to the observation specifications, the discharge pipe at the rear end of the flow meter 8 should be appropriately raised, and the raising height of 20cm is appropriate.

[0041] In the comprehensive observation of artesian wells, a water diversion pipe 9 is usually set up in the discharge pipeline. The water diversion pipe 9 is connected to the gas collection device for gas observation or a sampling port is reserved for water chemistry observation. The design of the water diversion pipe 9 should be based on the principle that the flow of the water diversion pipe 9 is stable and does not affect the water level of the main well. This device uses a slightly downward angle to connect the water diversion pipe 9, and the end of the discharge pipeline is slightly upward to ensure the water supply of the water diversion pipe 9. One or more faucets are installed at the end of the water diversion pipe 9 as sampling ports or water ports for the gas collection device. Regardless of the sampling port or the water port, the flow must be fixed to maintain a long water flow state to avoid affecting the front water level. The terminal discharge pipe extends out of the well house and directly discharges into the discharge pool 2.

[0042] The underground backup drainage pipeline 14 is mainly used to stop the ground drainage system when the water level of the artesian well drops and there is a risk of interruption, and activate the backup drainage system to achieve the effect of reducing the drainage height and continuing the gravity state. The main difference from the ground drainage system is that the underground drainage pipeline needs to solve the problem of drainage discharge. This device designs a 4m3-6m3 glass fiber reinforced plastic water storage tank 13 in the basement, with air holes on the top of the water storage tank 13. The drainage pipeline is connected from the high position of the water storage tank 13. The drainage pipe 12 is installed at the bottom of the water storage tank 13. The water from the drainage well is pumped to the ground through the fully automatic water pump 11 and directly discharged into the drainage pool 2. The fully automatic water pump 11 is set with one main and one backup, which can be switched manually or automatically.

[0043] The spillway 2 is outside the well house, with a volume of 2m 3 -3m 3 , the water from the drainage pipe well is naturally discharged directly into the drainage pool 2, and an underground external drainage pipe 24 is installed about 20cm from the bottom of the drainage pool 2. The buried depth of the external drainage pipe 12 is not less than 1m, and it is naturally discharged to the municipal ditch by utilizing the height difference. The diameter of the external drainage pipe 12 should not be less than the diameter of the drainage pipe to ensure that the pool water is discharged in time without contacting the upper end of the drainage pipe.

[0044] In order to deal with the risk of interruption of flow due to the drop in water level in the artesian well, this device adds an underground backup drainage system. The backup system is not activated when the aboveground drainage system is working normally, and the flow control valve and the main and auxiliary well connecting pipe 17 are both in a closed state, which has no effect on the aboveground drainage system.

[0045] The underground backup drainage system is designed with a 4m3-6m3 water storage tank 13, which plays a buffering role for the drainage pool 2. The two water pumps are fully automatically controlled, and the main and standby motors can be automatically switched to ensure that the well water is discharged from the basement in a timely and smooth manner.

[0046] There is a certain relationship between the stability of the water level and the water head height. The lower the water head height, the more unstable the water level. The discharge pipe in the device is installed 40 cm from the ground, which is appropriately lower than the industry standard. One side of the connecting pipe 17 and the main well pipe 20 is 20 cm higher than the discharge pipe, which can reduce the water flow disturbance on the connecting pipe 17 caused by the leakage and leave a larger dynamic space for the water head height.

[0047] The auxiliary well pipe 19 is mainly used for water level observation in artesian wells with high gas content to reduce the impact of floating bubbles deep in the main well pipe 20 on the water level. The optimal observation depth of the water level sensor is 4m-5m. The length of the auxiliary well pipe 19 extends to 5m below the basement, and the installation space of the water level sensor is not limited.

[0048] Artesian well seismic monitoring usually conducts water chemistry observations, which requires the design of a water pipe 9 or a sampling port connected to the gas collection device. The terminal discharge pipe of the device and the water pipe 9 are designed to be in an upper and lower relationship, and the water pipe 9 drains downward to ensure the water volume of the gas collection device.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A seismic observation device for a double-drainage system of an artesian well, characterized in that: Including main well pipe, auxiliary well pipe, above-ground drainage pipeline, underground spare drainage pipeline and drainage pool; The main well pipe and the auxiliary well pipe are connected by a connecting pipe inclined at 30°-45°, and one side of the main well pipe is the high end; the main well pipe and the auxiliary well pipe are connected by connecting pipes between the parts located above ground and between the parts located underground, and valves are provided on the underground connecting pipes; The aboveground leakage pipeline is connected to the aboveground portion of the main well pipe, and the underground backup leakage pipeline is connected to the underground portion of the main well pipe; the aboveground connecting pipe is located at a higher position than the aboveground leakage pipeline in the main well pipe, and the underground connecting pipe is located at a higher position than the underground backup leakage pipeline in the main well pipe; On the ground leakage pipeline, a plexiglass side pressure pipe is installed near the main well pipe, and a scale is marked on the side pressure pipe; a flow control valve is installed on the ground leakage pipeline at the rear end of the side pressure pipe, and a flow meter is installed on the ground leakage pipeline at the rear end of the flow control valve, and the ground leakage pipeline at the rear end of the flow meter is raised; A water diversion pipe is set in the middle of the ground drainage pipeline; the water diversion pipe is angled downward, and one or more taps are installed at the end of the water diversion pipe as a sampling port or a water inlet for a gas collection device; the end ground drainage pipeline is angled upward at a small angle, and the end ground drainage pipe extends out of the well house and directly discharges into the drainage pool; An organic glass side pressure pipe is installed near the main well pipe on the underground standby leakage pipeline, and a scale is marked on the side pressure pipe; a flow control valve is installed on the underground standby leakage pipeline at the rear end of the side pressure pipe, and the underground standby leakage pipeline at the rear end of the flow control valve is raised and connected to the glass fiber reinforced plastic water storage tank, and an air hole is left on the top of the water storage tank; the underground standby leakage pipeline is connected from the high position of the water storage tank, and a drainage pipe is installed at the bottom of the water storage tank. The water from the leakage well is pumped to the ground by a fully automatic water pump and directly discharged into the leakage pool; The spillway is outside the well house, and an underground external drainage pipe is installed at the bottom of the spillway.

2. The seismic observation device for the double-drainage system of an artesian well according to claim 1, characterized in that: The fully automatic water pump is provided with one main pump and one backup pump.

3. A seismic observation device for a double-drainage system of an artesian well according to claim 1 or 2, characterized in that: The diameter of the external drainage pipe shall not be less than the diameter of the underground backup drainage pipe and the ground drainage pipe.

4. A seismic observation device for a double-drainage system of an artesian well according to claim 3, characterized in that: The bottom of the auxiliary well pipe is sealed and has a conical bottom.

5. The seismic observation device for the double-drainage system of an artesian well according to claim 4, characterized in that: The above-ground drainage pipeline shall not be less than two-thirds of the main well diameter.

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