Three-plug water pressing test device

Abstract

The utility model discloses a three-plug water pressure test device which comprises a working pipe and a pressurizing pipe which are arranged in a drill hole, the working pipe is connected with a water supply device, the pressurizing pipe is connected with a pressurizing device, and the surfaces of the working pipe and the pressurizing pipe are sequentially provided with an upper water stop plug, a lower water stop plug and a bottom water stop plug. A water outlet hole is formed in the portion, between the upper water stop plug and the lower water stop plug, of the surface of the working pipe, a pressure sensor is arranged between the lower water stop plug and the bottom water stop plug, and a water level sensor is arranged on the upper side of the upper water stop plug. The three-plug water pressure test device disclosed by the utility model can accurately detect whether the water leakage condition exists in the water stop equipment or not, can accurately master the permeability rate of the rock mass at the test section, and achieves the effect of efficiently and accurately acquiring the permeability parameters of the rock mass.

Description

Technical Field

[0001] The utility model relates to the technical field of geological survey for water conservancy and hydropower engineering, in particular to a three-plug water pressure test device. Background Art

[0002] The water pressure test is the most commonly used in-situ permeability test in engineering geological surveys. Its main purpose is to determine the water permeability of the rock mass and provide basic parameters for evaluating the permeability characteristics of the rock mass and designing seepage control measures. The traditional water pressure test in the water conservancy and hydropower industry is the single plug water pressure test method, that is, when the borehole reaches the target depth, the drill rod is connected to the water stop plug and lowered to the bottom of the hole. The test section 5m above the bottom of the hole is tested with a specific water pressure, and the permeability of the target section is calculated by the injected flow rate. The disadvantage of this method is that the borehole needs to be drilled to the target position, the drill needs to be lifted and the water stop plug is assembled, and then the drill is lowered to the bottom of the hole. Each section of the water pressure test requires repeated assembly of the plug, which is inefficient.

[0003] At present, the industry has improved on the basis of the single plug water pressure test and has developed a double plug water pressure test. The double plug water pressure test can press water from bottom to top after the drilling is completed, which improves the work efficiency compared with the single plug water pressure test. However, whether there is water leakage at the lower plug of the double plug water pressure test and whether the test data is true and reliable have not been effectively solved. Summary of the invention

[0004] The utility model aims to overcome the above-mentioned shortcomings and provide a three-plug water pressure test device to solve the problems of low efficiency of the traditional single plug and inability of the double plug to detect whether the lower plug is leaking.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a three-plug water pressure test device, including a working pipe and a pressure pipe arranged in a borehole, the working pipe is connected to a water supply device, the pressure pipe is connected to a pressurizing device, the surfaces of the working pipe and the pressure pipe are provided with an upper water stop plug, a lower water stop plug and a bottom water stop plug in sequence, a water outlet hole is opened on the surface of the working pipe between the upper water stop plug and the lower water stop plug, a pressure sensor is provided between the lower water stop plug and the bottom water stop plug, and a water level sensor is provided on the upper side of the upper water stop plug.

[0006] Preferably, the water supply device comprises a water pipe connected to the upper end of the working pipe, the water pipe is connected to the water reservoir, and a pressure gauge, a flow meter and a constant pressure water pump are sequentially arranged on the water pipe.

[0007] Preferably, the pressurizing device comprises an air compressor connected to the pressurizing pipe.

[0008] Preferably, the pressure sensor and the water level sensor are both connected to a monitoring instrument.

[0009] Preferably, the pressure relief pipe is divided into three sections; the lower end of the pressure relief pipe of the lower section is connected to the upper side of the bottom water-stop plug, and the upper end of the pressure relief pipe of the lower section is connected to the lower side of the lower water-stop plug; the lower end of the pressure relief pipe of the middle section is connected to the upper side of the lower water-stop plug, the upper end of the pressure relief pipe of the middle section is connected to the lower side of the upper water-stop plug, and the lower end of the pressure relief pipe of the upper section is connected to the upper side of the upper water-stop plug; seals are provided at the above-mentioned connecting positions.

[0010] Preferably, the suppression tube passes through the upper water stop plug, the lower water stop plug and the bottom water stop plug in sequence, and an air outlet is provided in the area of ​​the suppression tube located inside the plug, and a seal is provided at the position where the suppression tube contacts the plug.

[0011] Preferably, the upper water-stopping plug, the lower water-stopping plug and the bottom water-stopping plug are all airbag structures made of rubber material.

[0012] Beneficial effects of the utility model:

[0013] 1. The three-plug water pressure test device of the utility model can accurately detect whether there is water leakage in the water-stopping equipment, and can accurately grasp the water permeability of the rock mass in the test section, so as to achieve the effect of collecting rock permeability parameters with high efficiency and high precision;

[0014] 2. The device is suitable for water pressure tests of all bedrock boreholes, including shallow holes, deep holes, dry holes, etc., and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a three-plug water pressure test device;

[0016] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the area where the upper middle water stop plug, the lower water stop plug and the bottom water stop plug are located. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1-2As shown, a three-plug water pressure test device includes a working pipe 9 and a pressure pipe 6 arranged in a borehole, the working pipe 9 is connected to a water supply device, the pressure pipe 6 is connected to a pressure device, the working pipe 9 and the pressure pipe 6 are provided with an upper water stop plug 10, a lower water stop plug 12 and a bottom water stop plug 14 on the surface of the working pipe 9 and the pressure pipe 6 in sequence, a water outlet hole 11 is opened on the surface of the working pipe 9 between the upper water stop plug 10 and the lower water stop plug 12, a pressure sensor 13 is provided between the lower water stop plug 12 and the bottom water stop plug 14, and a water level sensor 8 is provided on the upper side of the upper water stop plug 10. In this embodiment, the area in the borehole between the upper water stop plug 10 and the lower water stop plug 12 is a water pressure test section, and the working pipe 9 in the water pressure test section is a flower tube structure, the bottom of the flower tube is sealed, and a plurality of water outlet holes 11 are provided on the wall of the working pipe itself, which are connected to the test section. The water level sensor 8 is arranged about 1 cm above the groundwater level line to detect the leakage of the upper water stop plug, while the pressure sensor 13 is used to detect the leakage of the lower water stop plug 12; the pressure sensor 13 is arranged in contact with the wall of the working pipe 9 and is a detachable connection.

[0019] Preferably, the water supply device comprises a water pipe 4 connected to the upper end of the working pipe 9, the water pipe 4 is connected to the water reservoir, and a pressure gauge 2, a flow meter 3 and a constant pressure water pump 1 are sequentially arranged on the water pipe 4.

[0020] Preferably, the pressurizing device comprises an air compressor 5 connected to a pressurizing pipe 6 .

[0021] Preferably, the pressure sensor 13 and the water level sensor 8 are both connected to the monitor 7. In this embodiment, the pressure sensor 13 and the water level sensor 8 are both connected to the monitor 7 through a data line. The monitor 7 can be a controller (such as a PLC controller with a display screen) or a monitoring device such as a computer to achieve a real-time monitoring function. If the water level sensor 8 detects that the water level in the borehole rises, it means that the upper water stop plug 10 is leaking; if the pressure sensor 13 detects that there is a change in water pressure, it means that the lower water stop plug 12 is leaking.

[0022] Preferably, the pressure-relief pipe 6 is divided into three sections; the lower end of the pressure-relief pipe 6 of the lower section is connected to the upper side of the bottom water-stop plug 14, and the upper end of the pressure-relief pipe 6 of the lower section is connected to the lower side of the lower water-stop plug 12; the lower end of the pressure-relief pipe 6 of the middle section is connected to the upper side of the lower water-stop plug 12, the upper end of the pressure-relief pipe 6 of the middle section is connected to the lower side of the upper water-stop plug 10, and the lower end of the pressure-relief pipe 6 of the upper section is connected to the upper side of the upper water-stop plug 10; the above-mentioned connecting positions are provided with seals.

[0023] Preferably, the pressure tube 6 passes through the upper water stop plug 10, the lower water stop plug 12 and the bottom water stop plug 14 in sequence, and an air outlet is opened in the area of ​​the pressure tube 6 located inside the plug, and a seal is provided at the position where the pressure tube 6 contacts the plug.

[0024] Preferably, the upper water-stopping plug 10 , the lower water-stopping plug 12 and the bottom water-stopping plug 14 are all airbag structures made of rubber.

[0025] Preferably, the working pipe 9 can be composed of multiple drill rods, and the drill rods are sealed with sealing rings to ensure that the working pipe 9 is watertight.

[0026] In the embodiment, the inner diameter of the borehole 1 is 91 mm, and the inner diameter of the working tube 2 is 50 mm. In other embodiments, the sizes of the borehole and the working tube 2 are not limited.

[0027] The working principle of this embodiment is as follows:

[0028] A method for implementing a three-plug water pressure test device comprises the following steps:

[0029] Step 1: Complete a geological drilling for the test target and lift the drill after drilling to the designed hole depth;

[0030] Step 2: Place the three-plug water pressure test device at the bottom of the hole through the drilling rig;

[0031] Step 3: Perform a full-hole water pressure test on the water pressure test device from bottom to top. After the device reaches the first section, use an air compressor to pressurize and inflate the upper water stop plug, the lower water stop plug and the bottom water stop plug to expand them and seal the drilling test section.

[0032] Step 4: After checking the pressure gauge, flow meter, and monitor, turn on the constant pressure water pump to start injecting water;

[0033] Step 5: During the water injection process, always observe the monitor to check whether there are any changes in the water level sensor and pressure sensor. If there are no changes, it means that the water is stopped successfully. If there are changes, it means that the water is stopped unsuccessfully. It is necessary to continue to pressurize the water stop plug or use the drilling rig to fine-tune the test section up and down, and repeat this process until the water is stopped successfully.

[0034] Step 6: Pressurize the test section to 0.3MPa, 0.6MPa, 1MPa, 0.6MPa, and 0.3MPa as test pressures, inject clean water, and use a flow meter to record the flow rate at each pressure;

[0035] Step 7: After the first section of the water pressure test is completed, stop injecting water, deflate the water stop plug, shrink the plug, let it stand for a while, then start to lift the water pressure device to the next section, and repeat this process. Note that each test section needs to overlap by 10cm to 20cm to ensure that no section is missed.

[0036] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A three-plug water pressure test device, comprising a working pipe (9) and a pressure pipe (6) arranged in a borehole, wherein the working pipe (9) is connected to a water supply device, and the pressure pipe (6) is connected to a pressure device, characterized in that: An upper water stop plug (10), a lower water stop plug (12) and a bottom water stop plug (14) are provided on the surfaces of the working tube (9) and the pressure tube (6) in sequence; a water outlet hole (11) is provided on the surface of the working tube (9) between the upper water stop plug (10) and the lower water stop plug (12); a pressure sensor (13) is provided between the lower water stop plug (12) and the bottom water stop plug (14); and a water level sensor (8) is provided on the upper side of the upper water stop plug (10).

2. A three-plug water pressure test device according to claim 1, characterized in that: The water supply device comprises a water pipe (4) connected to the upper end of the working pipe (9), the water pipe (4) being connected to a water reservoir, and a pressure gauge (2), a flow meter (3) and a constant pressure water pump (1) being provided on the water pipe (4) in sequence.

3. A three-plug water pressure test device according to claim 1, characterized in that: The pressurizing device comprises an air compressor (5) connected to a pressurizing pipe (6).

4. A three-plug water pressure test device according to claim 1, characterized in that: The pressure sensor (13) and the water level sensor (8) are both connected to the monitoring instrument (7).

5. The three-plug water pressure test device according to claim 1, characterized in that: The pressure-relief pipe (6) is divided into three sections; the lower end of the pressure-relief pipe (6) of the lower section is communicated with the upper side of the bottom water stop plug (14), and the upper end of the pressure-relief pipe (6) of the lower section is communicated with the lower side of the lower water stop plug (12); the lower end of the pressure-relief pipe (6) of the middle section is communicated with the upper side of the lower water stop plug (12), the upper end of the pressure-relief pipe (6) of the middle section is communicated with the lower side of the upper water stop plug (10), and the lower end of the pressure-relief pipe (6) of the upper section is communicated with the upper side of the upper water stop plug (10); and the above-mentioned communication positions are provided with seals.

6. A three-plug water pressure test device according to claim 1, characterized in that: The pressure-relief pipe (6) passes through the interior of the upper water-stopping plug (10), the lower water-stopping plug (12) and the bottom water-stopping plug (14) in sequence, and an air outlet is provided in the area of ​​the pressure-relief pipe (6) located inside the plug, and a seal is provided at the position where the pressure-relief pipe (6) contacts the plug.

7. A three-plug water pressure test device according to claim 1, characterized in that: The upper water-stopping plug (10), the lower water-stopping plug (12) and the bottom water-stopping plug (14) are all airbag structures made of rubber material.

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