Micro-water test device

Abstract

The utility model relates to a micro-water test device. The micro-water test device comprises a water lifting container and a water level gauge, the water lifting container comprises an inner-layer barrel, an outer-layer barrel and a water storage cavity located between the inner-layer barrel and the outer-layer barrel, the inner-layer barrel is of a barrel structure with the upper portion and the lower portion open, the water lifting container is provided with a drill rod connecting piece, and the drill rod connecting piece is not located over a horn mouth of the inner-layer barrel; when a micro-water test is carried out, the water lifting container is lowered to a position below an underground water level line along the drill hole through the drill rod, and meanwhile, the water level gauge is lowered to a position below the bottom surface of the water lifting container through the hollow cavity of the cylinder on the inner side of the water lifting container; the water lifting container is rapidly lifted to the position higher than the underground water level line through the drill rod, the position of the water level gauge is kept unchanged, the water level is monitored, and meanwhile the variable amplitude of the water level in a drill hole can be rapidly and accurately measured.

Description

Technical Field

[0001] The utility model relates to the field of hydrogeological tests, and in particular to a micro-water test device, which can instantly change the water level in a hole during a micro-water test, and can quickly and accurately measure the amplitude of the water level change in the borehole, thereby improving the safety, accuracy and efficiency of field hydrogeological tests and basic hydrological data collection processes. Background Art

[0002] Rock (soil) hydrogeological parameters are essential for identifying hydrogeological conditions and conducting quantitative research on groundwater. They can provide basic data for estimating the amount of water inflow from mines (pits), and for the prevention and control of groundwater in ore deposits and their comprehensive utilization. The slug test is a method for determining hydrogeological parameters. This method is a simple and relatively fast field test method for obtaining hydrogeological parameters. It is a test that monitors the change of water level and time in a short period of time by instantly changing the amount of water in the borehole. The principle of the slug test is to make the water level in the borehole change instantly through certain stimulation means, and then observe the change of the borehole water level over time, and fit it with the standard curve obtained based on the theoretical mathematical model, so as to obtain the hydrogeological parameters of the underground aquifer in the test wellbore or borehole; the method is economical, low-cost, easy to operate, and less affected by the on-site environment.

[0003] Existing means of changing the borehole water level include using pressure, water lifting or water injection equipment to instantly change the water level in the hole; among them, changing the borehole water level by water lifting equipment is a relatively simple and easy-to-operate method. It only needs to lower the water lifting equipment into the borehole and quickly lift out part of the water in the borehole to achieve the purpose of changing the water level in the borehole. The existing micro-water test process requires the water level in the borehole to be instantly changed and then the change in water level is observed. After the borehole water level is changed by the water lifting equipment, the water level meter needs to be immediately placed in the measuring borehole to measure the change in water level. For some strata with good permeability, after the water lifting device lifts water, the water level will return to the static water level in a very short time, generally 0.1-3 minutes. This time cannot meet the placement of the water level meter, which makes the test difficult to succeed, that is, the water lifting process and the measurement process cannot be carried out simultaneously. Even if, for formations with poor permeability, the lowering time of the water level meter meets the test requirements and can be placed in the borehole for measurement in time, the measurement accuracy of the existing water level meter is difficult to meet the test requirements, and the entire test process is very short. Moreover, the lowering process of the existing water level meter is basically manually operated. When the drilling depth is large, the retraction and release of the water level meter will be more troublesome, and the water level meter is easy to scratch the hole wall during the lowering process, which will have a certain impact on the test. Therefore, it is necessary to improve the micro-water test equipment and measurement methods to meet the test requirements for data. Summary of the invention

[0004] In view of the problems existing in the prior art, the present utility model provides a micro water test device, which can be conveniently installed and used at the drilling site for micro water tests, and can ensure that the water level gauge can continuously measure the water level during the micro water test.

[0005] To achieve the above technical objectives, the present utility model provides a micro water test device. The micro water test system includes a water lifting container and a water level gauge. The water lifting container includes an inner cylinder, an outer cylinder, and a water storage cavity located between the inner and outer cylinders. The cavity opening of the water storage cavity is open. The inner cylinder is a cylinder structure that is open at both the top and bottom, and its upper cylinder opening is a flared opening with a larger upper part and a smaller lower part. The water lifting container is provided with a drill pipe connector, which is fixedly connected above the water inlet of the water lifting container through a plurality of connecting rods, and the drill pipe connector is not directly above the flared opening of the inner cylinder. A thread interface matching the drill pipe is provided at the upper end of the drill pipe connector; the water level gauge is located below the bottom surface of the water lifting container through a lifting rope passing through the hollow cavity of the inner cylinder.

[0006] A preferred technical solution of the present utility model: The water level gauge is controlled to lift and lower by an electric retracting and releasing mechanism. The electric retracting and releasing mechanism includes a bracket, a rope winding disc, and a high-torque power device. The rope winding disc is rotatably installed on the bracket; one end of the lifting rope is wound around the rope winding disc, and the other end is connected to the tail of the water level gauge. The output shaft of the high-torque power device is connected to the central rotating shaft of the rope winding disc, and the high-torque power device is used to control the forward or reverse rotation of the rope winding disc to retract and release the lifting rope.

[0007] A preferred technical solution of the present utility model: The water level gauge includes a water level sensing probe and a control module installed on the electric retracting and releasing mechanism. The water level sensing probe includes a water-permeable outer housing and a piezoresistor located inside the water-permeable outer housing; the positive and negative wires of the piezoresistor extend along the lifting rope to the electric retracting and releasing mechanism respectively, and are signal-connected to the control module, and the control module controls the opening and closing of the water level sensing probe and data transmission.

[0008] A preferred technical solution of the present utility model: The outer cylinder opening of the water lifting container and the cylinder opening of the inner cylinder are connected by at least three support rods.

[0009] A preferred technical solution of the present utility model: The water lifting container is a metal cylinder structure, and the connecting rods are metal rods, and their two ends are respectively welded to the cylinder opening of the outer cylinder and the bottom of the drill pipe connector.

[0010] A preferred technical solution of the present utility model: The lifting rope is a rope with scales.

[0011] Preferred technical solution of the present utility model: The high-torque power device includes a motor, a battery, and a control switch. The forward and reverse rotations of the motor are controlled by the control switch, and the battery provides power for the motor.

[0012] Preferred technical solution of the present utility model: A manual rotation handle is provided on the rope winding disc.

[0013] During the test process of the present utility model, the water-lifting device should be ensured to be below the groundwater level line to ensure that the inside of the water-lifting container is filled with water. The drill pipe is driven by the winch of the drilling rig to lift, thereby driving the water-lifting container to instantly lift a certain distance. Therefore, the water volume in the borehole will instantaneously decrease. Since the water recharge in the aquifer cannot be completed instantaneously, the water level will show an instantaneous drop and then quickly rise to the static water level; during this process, the water level gauge can accurately monitor; the contraction and lowering of the water level gauge are controlled by a power motor, which can improve the retracting and lowering efficiency. A piezoresistor is arranged inside the water level gauge of the present utility model. After coming into contact with water or when the atmospheric pressure changes greatly, its resistance value changes, thereby causing a change in the current in the circuit; through a depth display device with a storage function, at different depths, the resistance value of the piezoresistor will change linearly, thereby causing a change in the current in the circuit. By measuring the change in the current, the change in the water level can be obtained. The display device can store data with a time step of 1 second and can transmit the data through the water level data output interface. Technical personnel can perform data processing and operations. The lower part of the water level gauge is conical, and the side wall is permeable, allowing water to freely enter and exit, ensuring the stability of the reading, smoother operation, and less likely to get stuck with the well wall.

[0014] The beneficial effects of the present utility model are as follows:

[0015] (1) The present utility model improves the water-lifting device, which can be easily connected to the drill pipe, can quickly descend and ascend through the drill pipe, and can lower the water level gauge while lifting water. It can perform monitoring simultaneously after the water-lifting is completed, ensuring the normal progress of the test; the entire device can be operated simply and quickly in the micro-water test.

[0016] (2) It can ensure that the water level gauge continuously measures the water level during the micro-water test process and can be more applied to other hydrogeological tests.

[0017] (3) The water level gauge in the present utility model is equipped with a piezoresistor and a depth display device with a storage function, which can ensure that the water level gauge is not affected by the leakage of the borehole wall during use and ensure the accuracy of the measurement.

[0018] (4) The water level gauge in the present utility model is electrically controlled, and its control mechanism includes a high-torque power device, which can improve the winding and unwinding efficiency. During the winding and unwinding process, manual labor can be reduced. Only one person is needed to tow the lifting rope to ensure that the lifting rope can move up and down along the central position of the water-lifting container, without rubbing against the hole wall or affecting the water-lifting container; the efficiency of winding and unwinding the rope in the rope reel before and after the test is increased, improving the convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the water-lifting container in the present utility model;

[0021] Figure 3 is a front view of the electric winding and unwinding mechanism in the present utility model;

[0022] Figure 4 is a side view of the electric winding and unwinding mechanism in the present utility model;

[0023] Figure 5 is an enlarged schematic diagram of the high-torque power device in the present utility model;

[0024] Figure 6 is a connection schematic diagram of the water level gauge and the electric winding and unwinding mechanism in the present utility model;

[0025] Figure 7 is an enlarged schematic diagram of the water level induction probe in the present utility model;

[0026] Figure 8 is a control schematic diagram of the water level gauge in the present utility model;

[0027] Figure 9 is a schematic diagram of the micro water test operation in the present utility model;

[0028] Figure 10 is a water level change curve graph of the micro water test in the embodiment.

[0029] In the figures: 1 - water-lifting container, 100 - inner cylinder, 101 - outer cylinder, 102 - water storage cavity, 2 - water level gauge, 200 - permeable outer shell, 201 - piezoresistor, 202 - 9V power supply, 203 - control switch, 204 - display module, 3 - drill pipe connector, 4 - electric winding and unwinding mechanism, 400 - bracket, 401 - rope reel, 402 - high-torque power device, 403 - rotating handle, 5 - drill pipe, 6 - connecting rod, 7 - drill hole, 8 - groundwater level line, 9 - lifting rope, 10 - water level data output interface. SPECIFIC EMBODIMENTS

[0030] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. The attached Figures 1 to 10 are all the drawings of the embodiments, which are drawn in a simplified manner and are only used to clearly and concisely illustrate the purpose of the embodiments of the present utility model. The technical solutions shown in the drawings below are the specific solutions of the embodiments of the present utility model and are not intended to limit the scope of the present utility model claimed. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0032] The embodiment provides a micro-water test device, as Figures 1 to 8 shown, which includes a water-lifting container 1 and a water level gauge. The water-lifting container 1 includes an inner cylinder 100, an outer cylinder 101 and a water storage cavity 102 located between the inner and outer cylinders. The mouth of the outer cylinder 101 of the water-lifting container 1 is connected to the mouth of the inner cylinder 100 by at least three support rods 103. The mouth of the water storage cavity 102 is open. The inner cylinder 100 is a cylinder structure that is open at both the top and bottom, and its upper mouth is a flared mouth with a larger upper part and a smaller lower part. The water-lifting container 1 is provided with a drill pipe connector 3, and the drill pipe connector 3 is fixedly connected above the water inlet of the water-lifting container 1 through a plurality of connecting rods 6. The water-lifting container 1 is a metal cylinder structure, and the connecting rods 6 are metal rods, and their two ends are respectively welded to the mouth of the outer cylinder 101 and the bottom of the drill pipe connector 3. The drill pipe connector 3 is not directly above the flared mouth of the inner cylinder 100 and does not affect the lowering of the water level gauge 2; a thread interface matching the drill pipe 5 is provided at the upper end of the drill pipe connector 3; the lifting rope 9 of the water level gauge 2 is connected to the electric winding and unwinding mechanism 4 to control the lifting and lowering of the water level gauge 2 through the electric winding and unwinding mechanism 4.

[0033] The embodiment provides a micro-water test device, as Figures 3 to 5As shown in the figure, the electric winding and unwinding mechanism 4 includes a bracket 400, a rope winding disc 401, and a high-torque power device 402. The rope winding disc 401 is rotatably installed on the bracket 400; the lifting rope 9 is a rope with scales. One end of the lifting rope 9 is wound around the rope winding disc 401, and the other end is connected to the tail of the water level gauge 2. The output shaft of the high-torque power device 402 is connected to the central rotating shaft of the rope winding disc 401, and the high-torque power device 402 is used to control the forward or reverse rotation of the rope winding disc 401 to wind and unwind the lifting rope 9; the high-torque power device 402 includes a motor, a battery, and a control switch. The forward and reverse rotation of the motor is controlled by the control switch, and the battery provides power for the motor. A manual rotation handle 403 is provided on the rope winding disc 401.

[0034] The embodiment provides a micro-water test device. As Figures 6 to 8 shown in the figure, the water level gauge 2 includes a water level induction probe and a control module installed on the electric winding and unwinding mechanism. The water level induction probe includes a water-permeable outer housing 200 and a piezoresistor 201 located inside the water-permeable outer housing 200; the positive and negative wires of the piezoresistor 201 extend along the lifting rope 9 to the electric winding and unwinding mechanism 4 respectively, and are signal-connected to the control module. The control module controls the opening and closing of the water level induction probe and data transmission. The lower end of the water-permeable outer housing 200 is conical; the control module includes a 9V power supply 202, a control switch 203, and a display module 204 that are signal-connected in sequence. The positive and negative wires of the piezoresistor 201 are led out through the lifting rope 9 and are connected in series with the 9V power supply 202 and the control switch 203. The energization or de-energization of the piezoresistor 201 is controlled by the control switch 203. The piezoresistor 201 is signal-connected to the display module 204, and the water level depth is displayed through the display module 204. The display module 204 has a storage function, stores data at a time step of 1 second, and outputs data through the water level data output interface 10.

[0035] When performing a micro-water test, as Figure 9 shown in the figure, the water lifting container 1 is lowered along the drill pipe 5 to below the groundwater level line 8. The water inlet at the upper end of the water lifting container 1 is immersed in the groundwater in the drill hole 7. At the same time, the water level gauge 2 is lowered through the hollow cavity of the inner cylinder of the water lifting container 1 to below the bottom surface of the water lifting container 1 through the electric winding and unwinding mechanism 4 and the lifting rope 9. After the water storage cavity 102 of the water lifting container 1 is filled with water, the water lifting container 1 is quickly lifted above the groundwater level line 8 through the drill pipe 5. When the water lifting container 1 is lifted, the water level gauge 2 remains in place to monitor the water level. The drill hole 7 is a drill hole formed by drilling, with a diameter of 91 mm; the outer diameter of the water lifting container 1 matches the inner diameter of the drill hole 7.

[0036] The use process of the micro-water test device in the embodiment specifically includes the following steps:

[0037] S1. After the drilling construction is completed, measure and take points for the drilled hole, check the equipment, and wait for 24 hours until the water level stabilizes to measure the static water level.

[0038] S2. Remove the core barrel, install the water-lifting container 1 on the drill pipe 5 through the drill pipe connector 3, and lower the water-lifting container to 3.0 - 4.0 m below the groundwater level line 8 according to the normal drilling steps, ensuring that the water-lifting container 1 can be completely immersed in the groundwater in the drill hole 7. The groundwater in the drill hole 7 enters the water storage cavity through the water inlet at the upper part of the water-lifting container 1 and fills the water storage cavity 102.

[0039] S3. Place the water level sensing probe of the water level gauge 2 at the orifice of the drill hole 7 and directly face the position of the middle cavity of the inner cylinder of the water-lifting container 1. Control the lowering of the lifting rope 9 through the electric winding and unwinding mechanism 4, thereby driving the water level sensing probe to pass through the middle cavity of the inner cylinder of the water-lifting container 1 and be located below the bottom surface of the water-lifting container 1.

[0040] S4. Turn on the control switch of the water level gauge 2 and check whether the instrument is normal. When ensuring the normal operation of the instrument, the micro water test can be started; the water level gauge in the present utility model is increased with a piezoresistor and a depth display device with a storage function, which can ensure that the water level gauge is not affected by factors such as water leakage from the hole wall during use.

[0041] S5. During the test, start the hoisting equipment of the drilling rig and quickly lift the water-lifting container 1 to a position more than 3.0 m. During the lifting process of the water-lifting container 1, the water level sensing probe remains in place and automatically measures the change of the water level; when quickly lifting the water-lifting container 1, the water in the drill hole rapidly decreases, and the water in the aquifer cannot instantaneously enter the drill hole through the drill hole wall. The process is generally 0.1 - 3 minutes. When the water-lifting container 1 is instantly lifted, the position of the water level gauge in the drill hole does not change. Therefore, this device can meet the requirements of the micro water test and can conduct the micro water test.

[0042] S6. After the water level returns to the initial water level, repeat the operations of steps S1 to S5 at least three times again, and collect the test data to complete the micro water test.

[0043] S7. After the test is completed, control the winding of the lifting rope through the electric winding and unwinding mechanism to pull out the water level sensing probe.

[0044] S8. After the test is completed, export the micro water test data and import it into the professional hydrogeological software AquiferTest for calculation. Figure 10 is the water level change curve graph of the micro water test; Figure 10 is the water level change curve graph of the micro water test. From Figure 10As can be seen, from 0 to 60 s, when the test was not carried out, the water level was the initial water level, remaining stable at about 3.25 m. At the 60th second, after the test started, due to the instantaneous water pumping, the water level in the borehole dropped instantaneously to about 1.20 m. After the 62nd second, the water level in the borehole was replenished by the water volume of the surrounding aquifer. Therefore, the water level gradually recovered to the initial water level of about 3.25 m, and the overall water level recovery rate was from fast to slow. Therefore, the operation and measurement steps of the micro-water test were successful.

[0045] As described above, this is only one embodiment of the present utility model, and its description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the appended claims.

Claims

1. A micro-water test device, characterized in that: The micro-water test system comprises a water lifting container (1) and a water level gauge (2). The water lifting container (1) comprises an inner cylinder (100), an outer cylinder (101) and a water storage cavity (102) located between the inner and outer cylinders. The cavity opening of the water storage cavity (102) is open. The inner cylinder (100) is a cylinder structure open at the top and bottom, and its upper cylinder opening is a bell-shaped mouth with a larger top and a smaller bottom. The water lifting container (1) is provided with a drill rod connecting piece (3). The drill rod connecting piece (3) is fixedly connected to the top of the water inlet of the water lifting container (1) through a plurality of connecting rods (6). The drill rod connecting piece (3) is not located directly above the bell-shaped mouth of the inner cylinder (100). A threaded interface matching the drill rod (5) is provided at the upper end of the drill rod connecting piece (3). The water level gauge (2) is located below the bottom surface of the water lifting container (1) by passing through the hollow cavity of the inner cylinder (100) through a lifting rope (9).

2. A micro-water test device according to claim 1, characterized in that: The water level gauge (2) is raised and lowered by an electric retractable mechanism (4), wherein the electric retractable mechanism (4) comprises a bracket (400), a rope reel (401) and a high-torque power device (402), wherein the rope reel (401) is rotatably mounted on the bracket (400); one end of the lifting rope (9) is wound around the rope reel (401), and the other end is connected to the tail of the water level gauge (2); the output shaft of the high-torque power device (402) is connected to the central rotating shaft of the rope reel (401), and the high-torque power device (402) controls the forward or reverse rotation of the rope reel (401) to retract and release the lifting rope (9).

3. A micro-water test device according to claim 1 or 2, characterized in that: The water level meter (2) comprises a water level sensing probe and a control module mounted on the electric retractable mechanism, the water level sensing probe comprising a water-permeable outer shell (200) and a varistor (201) located inside the water-permeable outer shell (200); the positive and negative wires of the varistor (201) extend along the lifting rope (9) to the electric retractable mechanism (4) respectively, and are signal-connected to the control module, and the control module controls the opening and closing of the water level sensing probe and data transmission.

4. A micro-water test device according to claim 1 or 2, characterized in that: The mouth of the outer cylinder (101) of the water lifting container (1) is connected to the mouth of the inner cylinder (100) via at least three support rods (103).

5. A micro-water test device according to claim 1 or 2, characterized in that: The water lifting container (1) is a metal cylinder structure, and the connecting rod (6) is a metal rod, the two ends of which are respectively welded to the mouth of the outer cylinder (101) and the bottom of the drill rod connecting piece (3).

6. A micro-water test device according to claim 1 or 2, characterized in that: The lifting rope (9) is a rope with scales.

7. A micro-water test device according to claim 2, characterized in that: The high torque power device (402) comprises a motor, a battery and a control switch. The control switch is used to control the forward and reverse rotation of the motor, and the battery is used to provide power to the motor.

8. A micro-water test device according to claim 2, characterized in that: The rope reel (401) is provided with a manual rotating handle (403).

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