Rock stratum permeability coefficient testing device and method

Abstract

The invention belongs to the technical field of permeability coefficient testing, and particularly relates to a rock stratum permeability coefficient testing device and method. Comprising bedrock; a test hole is formed in the bed rock; the bedrock is provided with a pile casing on the periphery of the test hole, and the other end of the pile casing is located above the water level; a water pumping module, a water stopping module and a measuring module are mounted on the working platform; the water stopping module is used for blocking the test hole, and the water pumping module is used for completely pumping water in the blocked test hole; monitoring is carried out through the measuring module in the process that underground water seeps into the testing hole; the water seepage coefficient of the bedrock is measured by directly drilling holes in the bedrock position, so that the test result is more accurate, and the stratum penetration condition is truly reflected.

Description

Technical Field

[0001] The invention belongs to the technical field of permeability testing, and in particular relates to a device and method for testing permeability of rock formations. Background Art

[0002] Deepwater bridge foundation construction generally adopts double-walled steel cofferdam with bottom seal. The so-called bottom seal is to pour a certain thickness of concrete in the cofferdam. The bottom seal concrete withstands water pressure and buoyancy to form a waterless working space environment. The bottom seal cofferdam is to connect the bottom of the cofferdam to the impermeable rock layer. The blade foot is consolidated with concrete and bedrock, and the rock's own impermeability is used to resist water pressure to ensure that there is no water seepage in the cofferdam or the water seepage is controllable.

[0003] The railway dedicated line bridge of a power plant has a maximum water depth of 32 meters. The main pier is designed as a bottom pile cap, which is located about 10 meters below the riverbed. The cap is rectangular and measures 16.4m×11.9m×3.5m. There are 12 bored piles with a diameter of 1.8m at the bottom of the cap, and the maximum drilling depth is 31.5m. The bored piles and the cap are cast with C30 concrete. The bottomless double-walled steel cofferdam technology is adopted, and the blade foot of the steel cofferdam must extend into the impermeable rock layer. The key to the bottomless surrounding rock is how to determine the permeability of the rock layer. At present, the rock permeability test is used, and the core is used as the test object. The core has limitations, and the measured results have large deviations and cannot reflect the actual situation.

[0004] The current rock permeability coefficient test generally conducts a core permeability test. This method can only reflect the characteristics of intact rocks, but cannot reflect the influence of various factors such as cracks, interlayers and water depth in the actual rock formation, and cannot reflect the actual formation permeability. Summary of the invention

[0005] In view of the above problems, the present invention proposes a rock formation permeability coefficient testing device, comprising bedrock; a test hole is opened on the bedrock; a casing is installed on the bedrock outside the test hole, and the other end of the casing is located above the water level; a pumping module, a water stop module and a measuring module are installed on the working platform;

[0006] The water-stopping module blocks the test hole, and the pumping module pumps out all the water in the blocked test hole; the measurement module monitors the process of groundwater seeping into the test hole.

[0007] Furthermore, the water-stop module includes a pressure pump, an oil pipe 1 and an oil bag 1; the pressure pump is installed on the working platform, and the pressure pump is connected to the oil bag 1 through the oil pipe 1; the oil bag 1 is located in the middle of the test hole.

[0008] Furthermore, the pumping module includes a pump and a pumping pipe; the pump is installed on the working platform, the pump is connected to the pumping pipe, the other end of the pumping pipe passes through the oil bag and extends to the bottom of the test hole; the pumping pipe is sealed and connected to the middle of the oil bag.

[0009] Furthermore, before the water-stopping module seals the test hole, the hole cleaning module cleans the test hole; the hole cleaning module includes a high-pressure water pump, and the water pumping pipe includes a No. 1 water pipe and a No. 2 water pipe; one end of the No. 1 water pipe is connected to the high-pressure water pump, the other end of the No. 1 water pipe is connected to the water pump, and the middle part of the No. 1 water pipe is connected to the No. 2 water pipe; a No. 2 valve is installed between the high-pressure water pump and the No. 1 water pipe; and a No. 1 valve is installed between the water pump and the No. 1 water pipe.

[0010] Furthermore, the measuring module comprises a liquid level meter, which is installed on the working platform; the liquid level meter is connected to a liquid level sensor and a pressure sensor; and the liquid level sensor and the pressure sensor are installed in the test hole.

[0011] Furthermore, the water-stopping module also includes oil bag 2, which is connected to the lower end of the oil bag through oil pipe 2; the working platform is equipped with a lifting module, which synchronously drives the pumping module, water-stopping module, hole cleaning module and measuring module to rise and fall.

[0012] Furthermore, it also includes a data processing module, which is connected to the liquid level measuring meter and the display device; the display device is installed on the working platform; the data processing module processes and records the test data at different positions of the test hole.

[0013] Furthermore, the No. 2 water pipe includes a No. 1 pipe and a No. 2 pipe; the outer wall of the No. 2 pipe is slidingly and sealingly connected to the inner wall of the No. 1 pipe; a lifting assembly is provided at one end of the No. 2 pipe away from the bottom of the test hole; the lifting assembly is used to drive the No. 2 pipe to telescope inside the No. 1 pipe.

[0014] Furthermore, the lifting assembly includes a lifting rod and a sealing groove; the sealing groove is opened on the No. 1 water pipe and is coaxial with the No. 2 water pipe; a sealing cover plate is installed on the sealing groove; one end of the lifting rod is fixedly connected to the No. 2 pipe, and the other end of the lifting rod is connected to the sealing cover plate through a telescopic assembly.

[0015] Furthermore, a sealing plate is provided at one end of the oil bag 1 on the outer circle of the second tube close to the bottom of the test hole; one end of the sealing plate is connected to the oil bag 1 through a torsion spring.

[0016] Furthermore, the telescopic assembly is an electric telescopic rod.

[0017] The present invention provides a method for testing the permeability coefficient of rock formations, using a device for testing the permeability coefficient of rock formations as described above, and specifically comprising the following steps:

[0018] The casing is lowered, and the test formation is drilled by means of a drilling rig and the core in the test hole is taken out;

[0019] Lower the water pump into the test hole and install the water stop module in the test hole;

[0020] Close valve No. 1 and open valve No. 2, and start the high-pressure water pump to flush the test hole;

[0021] Open the water-stop device and seal it against the wall of the test hole;

[0022] Close valve No. 2 and open valve No. 1, and start the pump to pump water from the test hole of the sealing part; after making sure that the water in the test hole is drained, turn off the pump;

[0023] Restart the measurement module to monitor the water seepage data of the test hole.

[0024] Beneficial Effects

[0025] The beneficial effects of the present invention compared to the prior art are as follows:

[0026] 1. The present application drills a test hole at the base position, seals the upper part of the test hole in the test stratum, and pumps out the water in the test hole. Groundwater seeps into the test hole through the test hole wall. The water level in the test hole is observed by a measuring module laid in the test hole, and the water seepage of the test hole per unit time is calculated. The permeability coefficient of the bedrock is measured by directly drilling a hole at the bedrock position, so that the test result is more accurate and truly reflects the permeability of the stratum. The permeability coefficient is automatically calculated by the data processing module, and the test calculation results of each bedrock section are recorded and clearly presented.

[0027] 2. The present application comprises a No. 2 water pipe consisting of a No. 1 pipe and a No. 2 pipe; the No. 2 pipe is passed into the bottom of the test hole when pumping water, and the No. 2 pipe is retracted into the No. 1 pipe when monitoring the water level in the test hole; thus ensuring the accuracy of the test results.

[0028] 3. The present application also provides a sealing plate, which is opened when the No. 2 pipe is working; when the water level is monitored, the No. 2 pipe is retracted, and the sealing plate and the oil bag 1 are sealed, thereby further ensuring the sealing performance in the test hole and further improving the accuracy of the test results.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1 The figure shows a schematic plan view of the whole embodiment of the present invention.

[0032] Figure 2 A schematic plan view of a partial structure in an embodiment of the present invention is shown.

[0033] Figure 3 Shows Figure 2 A partial enlarged view of point B in the middle.

[0034] Figure 4 Shows Figure 2 A partial enlarged view of point C in the middle.

[0035] Figure 5 A schematic diagram of the working platform in the present invention is shown.

[0036] Figure 6 A schematic diagram of the arrangement of oil bladder 1 and oil bladder 2 in an embodiment of the present invention is shown.

[0037] In the figure, 10, bedrock; 101, test hole; 102, casing; 20, working platform; 30, pumping module; 40, water stop module; 50, hole cleaning module; 60, measuring module; 401, pressure pump; 402, oil pipe 1; 403, oil bag 1; 404, oil pipe 2; 405, oil bag 2; 301, pump; 302, pumping pipe; 303, valve No. 1;

[0038] 501, high pressure water pump; 502, valve No. 2; 3021, water pipe No. 1; 3022, water pipe No. 2; 601, liquid level meter; 602, liquid level sensor; 603, pressure sensor;

[0039] 30221, pipe No. 1; 30222, pipe No. 2; 701, lifting rod; 702, sealing groove; 703, sealing cover plate; 704, telescopic assembly; 80, sealing plate; 801, torsion spring. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] This application adopts a bottomless cofferdam, utilizing the impermeable properties of the rock at the bottom of the cofferdam, and uses concrete to seal the contact between the rock blade and the rock, thereby forming a waterless working space environment. This method can save the amount of bottom-sealing concrete, but has high requirements on the permeability of the rock. Therefore, testing the rock permeability coefficient is the key to the success of bottomless concrete.

[0042] The present application provides a rock formation permeability test device, referring to Figure 1 , Figure 1 A in the middle represents the water level line, including bedrock 10; a test hole 101 is opened on the bedrock 10; a casing 102 is installed on the periphery of the test hole 101 of the bedrock 10, and the other end of the casing 102 is located above the water level line; a pumping module 30, a water stopping module 40, a hole cleaning module 50 and a measuring module 60 are installed on the working platform 20;

[0043] The other end of the water-stop module 40 is located in the middle of the test hole 101; the other end of the water-pumping module 30 extends to the bottom of the test hole 101; the other end of the hole-cleaning module 50 extends to the bottom of the test hole 101; the other end of the measuring module 60 is located inside the test hole 101;

[0044] After the hole cleaning module 50 cleans the test hole 101 , the water stopping module 40 blocks the test hole 101 , and the pumping module 30 pumps out all the water in the blocked test hole 101 ; the measurement module 60 monitors the process of groundwater seeping into the test hole 101 .

[0045] During the implementation process, the working platform 20 is used to determine the location of the test site and the location of the rock formation; then, a casing 102 is set at the test site. The casing 102 is a steel casing 102. The steel casing 102 generally uses a steel pipe with a diameter of 30 cm; the casing 102 is lowered to a depth of not less than two meters below the riverbed, while ensuring that the casing 102 is vertical and stable;

[0046] At the test stratum on the bedrock 10, a geological drill is used to drill a hole to the test stratum to form a test hole 101 on the test stratum; the diameter of the test hole 101 is not less than 10 cm, and the core in the test hole 101 is taken out at the same time, and the inner wall of the test hole 101 is preliminarily cleaned by using the geological drill;

[0047] Afterwards, the test hole 101 is flushed by the hole cleaning module 50. The flushing time is generally not less than 20 minutes. When the return water becomes clear, the flushing is stopped.

[0048] Restart the water-stopping device in the test hole 101, so that the water-stopping module 40 seals the lower part of the test hole 101, and the test position is the position between the water-stopping module 40 and the bottom of the test hole 101; restart the pumping module 30 to drain the water in the sealed part of the test hole 101; by pumping three times every five minutes, ensure that the water in the sealed position of the test hole 101 is drained; finally, restart the measuring module 60 to collect data in the test hole 101, and finally calculate the water seepage coefficient by Darcy's law;

[0049] The present application drills a test hole 101 at the bedrock 10, seals the upper part of the test hole 101 in the test stratum, and pumps out the water in the test hole 101. Groundwater seeps into the test hole 101 through the wall of the test hole 101. A measuring module 60 is laid in the test hole 101 to observe the water level in the test hole 101, calculate the water seepage amount of the test hole 101 per unit time, and infer the water permeability coefficient of the test stratum.

[0050] In one embodiment of the present invention, reference Figure 2 The water-stop module 40 includes a pressure pump 401, an oil pipe 402 and an oil bag 403; the pressure pump 401 is installed on the working platform 20, and the pressure pump 401 is connected to the oil bag 403 through the oil pipe 402; the oil bag 403 is located in the middle of the test hole 101.

[0051] During the implementation process, after the hole cleaning module 50 finishes hole cleaning, the water stop module 40 is started, and the pressure pump 401 is started to transport oil to the oil bag 403 through the oil pipe 402, which is a high-pressure oil pipe, so that the oil bag 403 expands and fits the inner wall of the test hole 101. The pressure is controlled between 1-2MPa according to the working conditions to achieve sealing of the middle part of the test hole 101;

[0052] The test position is the position between the oil bag 403 and the bottom of the test hole 101; if it is necessary to test the permeability coefficient of the lower section of the bedrock 10, the water-stopping module 40 can be closed again, and the test hole 101 position can be re-drilled downward, and then the water-stopping module 40 can be installed inside the test hole 101, and then the hole cleaning, water stopping, water pumping and monitoring steps are performed to measure the permeability coefficient of another section of the test hole 101; repeating in sequence can measure the permeability coefficient of the bedrock 10 sections at different positions from top to bottom.

[0053] In one embodiment of the present invention, reference Figure 2The pumping module 30 includes a pump 301 and a pumping pipe 302; the pump 301 is installed on the working platform 20, the pump 301 is connected to the pumping pipe 302, the other end of the pumping pipe 302 passes through the oil bag 403 and extends to the bottom of the test hole 101; the pumping pipe 302 is sealed and connected to the middle of the oil bag 403.

[0054] During the implementation process, after the water-stop module 40 seals the middle of the test hole 101, the pumping module 30 is started, and the pumping machine 301 is started. The pumping machine 301 is a vacuum pumping machine 301; the pumping machine 301 pumps out the water in the sealed position at the lower part of the test hole 101 through the pumping pipe 302;

[0055] In one embodiment of the present invention, reference Figure 2 , Figure 2 In the figure, a represents a diaphragm pressure tank, b represents a pressure gauge, and c represents a power distribution system, and c provides power for the entire test device; the hole cleaning module 50 includes a high-pressure water pump 501, and the water pumping pipe 302 includes a No. 1 water pipe 3021 and a No. 2 water pipe 3022; one end of the No. 1 water pipe 3021 is connected to the high-pressure water pump 501, the other end of the No. 1 water pipe 3021 is connected to the water pump 301, and the middle part of the No. 1 water pipe 3021 is connected to the No. 2 water pipe 3022; a No. 2 valve 502 is installed between the high-pressure water pump 501 and the No. 1 water pipe 3021; ​​a No. 1 valve 303 is installed between the water pump 301 and the No. 1 water pipe 3021.

[0056] During the implementation process, after the test hole 101 is preliminarily cleaned by the geological drilling rig, the No. 1 valve 303 is closed first and the No. 2 valve 502 is opened; then the hole cleaning module 50 is started, and the high-pressure water pump 501 is started. The high-pressure water pump 501 is a high-pressure centrifugal pump. The high-pressure water pump 501 is provided with a diaphragm pressure tank and a pressure gauge. The diaphragm pressure tank plays a role in stabilizing the water pressure and protecting the high-pressure water pump 501, and the pressure gauge is used to better monitor the working state of the high-pressure water pump 501; the high-pressure water pump 501 presses high-pressure water into the test hole 101 for flushing, and the high-pressure water flows into the No. 2 water pipe 3022 through the No. 1 water pipe 3021, and finally flows into the test hole 101; when the pump 301 is working, the No. 1 valve 303 is opened and the No. 2 valve 502 is closed.

[0057] In one embodiment of the present invention, reference Figure 2 and Figure 3 The measuring module 60 includes a liquid level meter 601, which is installed on the working platform 20; the liquid level meter 601 is connected to a liquid level sensor 602 and a pressure sensor 603 through a sensor cable; the liquid level sensor 602 and the pressure sensor 603 are installed in the test hole 101.

[0058] During the implementation process, after the pumping module 30 finishes working, the measuring module 60 is started, and the liquid level sensor 602 monitors the water level in the test hole 101. The water level in the test hole 101 can be recorded once an hour until the test hole 101 is full of water; and the water pressure in the test hole 101 is monitored by the pressure sensor 603; the water pressure monitoring is no less than 12 hours; this measurement process can be measured twice, and the average value of the two measurements is taken; then according to the seepage area in the test hole 101 and the seepage amount per unit time, the seepage coefficient is calculated using Darcy's law.

[0059] In one embodiment of the present invention, reference Figure 6 The water stop module 40 also includes a second oil bag 405, and the second oil bag 405 is connected to the lower end of the oil bag 1 403 through a second oil pipe 404; the work platform 20 is equipped with a lifting module, reference Figure 5 The lifting module synchronously drives the pumping module 30, the water stopping module 40, the hole cleaning module 50 and the measuring module 60 to rise and fall.

[0060] During the implementation process, a test hole 101 is first drilled by a geological drill, and the depth of the test hole 101 can reach close to the bottom of the bedrock 10; when the water permeability coefficient is tested at different positions in the test hole 101, the entire water-stopping module 40 is driven by the lifting module to move to different positions of the test hole 101, wherein the position between the oil bladder 1 403 and the oil bladder 2 405 is the specific position to be tested; then the pressure pump 401 is used to transport oil into the oil pipe 1 402, and the oil flows into the oil bladder 1 403, and then the oil is transported to the oil bladder 2 405 through the oil pipe 2 404, so that the oil bladder 1 403 and the oil bladder 2 405 are close to the inner wall of the test hole 101, and the position of the test hole 101 between the oil bladder 1 403 and the oil bladder 2 405 is closed, and then water is pumped out and subsequent monitoring is carried out;

[0061] At the same time, the distance between the oil bag 1 403 and the oil bag 2 405 can also be adjusted to change the position distance of the bedrock 10 section in a single test, and to adjust according to the requirements of different bedrock 10 tests;

[0062] In one embodiment of the present invention, a data processing module is further included, which is connected to the liquid level meter 601 and the display device; the display device is installed on the working platform 20; the data processing module processes and records the test data at different positions of the test hole 101.

[0063] During the implementation process, the data processing module processes the collected data separately according to the test position of the test hole 101, calculates the permeability coefficient of the bedrock 10 at that position according to the data collected by the liquid level sensor 602 and the pressure sensor 603, and records the collected data and permeability coefficient at different positions, and finally presents them on the display device; and forms a chart of the collected data and automatically calculated data at each position and presents it on the display device, so that the staff can understand the test results more quickly and clearly.

[0064] In one embodiment of the present invention, reference Figure 3 The No. 2 water pipe 3022 includes a No. 1 pipe 30221 and a No. 2 pipe 30222; the outer wall of the No. 2 pipe 30222 is slidably and sealedly connected to the inner wall of the No. 1 pipe 30221; a lifting assembly is provided at one end of the No. 2 pipe 30222 away from the bottom of the test hole 101; the lifting assembly is used to drive the No. 2 pipe 30222 to telescope and move inside the No. 1 pipe 30221.

[0065] During the implementation process, when the No. 2 water pipe 3022 is pumping water, the lifting assembly drives the No. 2 pipe 30222 to slide downward along the No. 1 pipe 30221, so that one end of the No. 2 pipe 30222 moves to the bottom of the test hole 101; after the pump 301 drains the water inside the test hole 101, the pump 301 is turned off; the lifting assembly is then started to drive the No. 2 pipe 30222 to retract into the No. 1 pipe 30221; to avoid the No. 2 pipe 30222 being located in the test hole 101 when the water level and pressure in the test hole 101 are subsequently tested, which affects the test results; to further ensure the stability of the test results.

[0066] In one embodiment of the present invention, reference Figure 4 The lifting assembly includes a lifting rod 701 and a sealing groove 702; the sealing groove 702 is opened on the No. 1 water pipe 3021 and is coaxial with the No. 2 water pipe 3022; a sealing cover plate 703 is installed on the sealing groove 702; one end of the lifting rod 701 is fixedly connected to the No. 2 pipe 30222, and the other end of the lifting rod 701 is connected to the sealing cover plate 703 through a telescopic assembly 704.

[0067] In one embodiment of the present invention, the telescopic assembly 704 is an electric telescopic rod.

[0068] During the implementation process, when flushing and pumping are required, the telescopic component 704 is extended. The telescopic component 704 is an electric telescopic rod. The electric telescopic rod is started to extend to drive the No. 2 pipe 30222 to move to the bottom of the test hole 101, and connected to the high-pressure water pump 501 for flushing, or connected to the pump 301 for pumping; the sealing of the lifting component and the No. 1 water pipe 3021 during operation is ensured by the sealing cover 703; before the measuring module 60 works, the electric telescopic rod is started to contract to drive the No. 2 pipe 30222 to move upward to the inside of the No. 1 pipe 30221; to prevent the No. 2 pipe 30222 from being located inside the test hole 101 during the water level measurement process, which affects the water level measurement result, thereby ensuring the accuracy of the measurement result.

[0069] In one embodiment of the present invention, reference Figure 3 The oil bag 1 403 is provided with a sealing plate 80 at one end of the outer circle of the second tube 30222 close to the bottom of the test hole 101; one end of the sealing plate 80 is connected to the oil bag 1 403 through a torsion spring 801.

[0070] During the implementation process, when the electric telescopic rod drives the No. 2 tube 30222 to extend, the No. 2 tube 30222 pushes the sealing plate 80 to rotate, and the sealing plate 80 rotates, causing the torsion spring 801 to produce elastic deformation, wherein the cross-sectional shape of the sealing plate 80 matches the shape of the bottom of the oil bag 403 after expansion; when measuring inside the test hole 101, the electric telescopic rod pulls the lifting rod 701 to drive the No. 2 tube 30222 to contract, and the sealing plate 80 loses the pressure of the No. 2 tube 30222. Under the action of the torsion spring 801, the sealing plate 80 fits with the oil bag 403 again to seal the hole on the oil bag 403, further ensuring the accuracy of the test results.

[0071] The present application provides a rock formation permeability coefficient testing method, using a rock formation permeability coefficient testing device as described above, specifically comprising the following steps:

[0072] Determine the location of the test site and the location of the rock formation; lower the casing 102; drill the test formation using a drilling rig and take out the core in the test hole 101;

[0073] Lower the water pumping pipe 302 into the test hole 101, and install the water stop module 40 in the test hole 101;

[0074] Close valve No. 1 303, open valve No. 2 502, and start high-pressure water pump 501 to flush the test hole 101;

[0075] Open the water-stop device to fit and seal with the wall of the test hole 101;

[0076] Close the No. 2 valve 502 and open the No. 1 valve 303, and start the pump 301 to pump water from the test hole 101 of the sealing part; after confirming that the water in the test hole 101 is drained, turn off the pump 301;

[0077] The measurement module 60 is restarted to monitor the water seepage data of the test hole 101 .

[0078] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rock formation permeability testing device, characterized in that: The invention comprises a bedrock (10); a test hole (101) is opened on the bedrock (10); a casing (102) is installed on the bedrock (10) on the periphery of the test hole (101), and the other end of the casing (102) is located above the water level line; a pumping module (30), a water-stopping module (40) and a measuring module (60) are installed on the working platform (20); The water-stopping module (40) blocks the test hole (101), and the water-pumping module (30) pumps out all the water in the blocked test hole (101); and the measurement module (60) monitors the process of groundwater seeping into the test hole (101).

2. A rock formation permeability testing device according to claim 1, characterized in that: The water-stop module (40) comprises a pressure pump (401), an oil pipe (402) and an oil bag (403); the pressure pump (401) is installed on the working platform (20), and the pressure pump (401) is connected to the oil bag (403) through the oil pipe (402); the oil bag (403) is located in the middle of the test hole (101).

3. A rock formation permeability testing device according to claim 1, characterized in that: The water pumping module (30) comprises a water pump (301) and a water pumping pipe (302); the water pump (301) is installed on the working platform (20), the water pump (301) is connected to the water pumping pipe (302), the other end of the water pumping pipe (302) passes through the oil bag (403) and extends to the bottom of the test hole (101); the water pumping pipe (302) is sealed and connected to the middle of the oil bag (403).

4. A rock formation permeability testing device according to claim 3, characterized in that: Before the water-stopping module (40) seals the test hole (101), the hole-cleaning module (50) cleans the test hole (101); the hole-cleaning module (50) comprises a high-pressure water pump (501), and the water pumping pipe (302) comprises a first water pipe (3021) and a second water pipe (3022); one end of the first water pipe (3021) is connected to the high-pressure water pump (501), the other end of the first water pipe (3021) is connected to the water pump (301), and the middle of the first water pipe (3021) is connected to the second water pipe (3022); a second valve (502) is installed between the high-pressure water pump (501) and the first water pipe (3021); and a first valve (303) is installed between the water pump (301) and the first water pipe (3021).

5. The rock formation permeability testing device according to claim 1, characterized in that: The measuring module (60) comprises a liquid level meter (601), which is installed on the working platform (20); the liquid level meter (601) is connected to a liquid level sensor (602) and a pressure sensor (603); and the liquid level sensor (602) and the pressure sensor (603) are installed in the test hole (101).

6. A rock formation permeability testing device according to claim 4, characterized in that: The water-stopping module (40) further comprises a second oil bag (405), wherein the second oil bag (405) is connected to the lower end of the first oil bag (403) via a second oil pipe (404); the working platform (20) is provided with a lifting module, wherein the lifting module synchronously drives the water pumping module (30), the water-stopping module (40), the hole cleaning module (50) and the measuring module (60) to rise and fall.

7. A rock formation permeability testing device according to claim 4, characterized in that: It also comprises a data processing module, which is connected to the liquid level measuring meter (601) and a display device; the display device is installed on the working platform (20); and the data processing module processes and records the test data at different positions of the test hole (101).

8. A rock formation permeability testing device according to claim 4, characterized in that: The No. 2 water pipe (3022) comprises a No. 1 pipe (30221) and a No. 2 pipe (30222); the outer wall of the No. 2 pipe (30222) is slidably sealedly connected to the inner wall of the No. 1 pipe (30221); a lifting assembly is provided at one end of the No. 2 pipe (30222) away from the bottom of the test hole (101); the lifting assembly is used to drive the No. 2 pipe (30222) to telescope and move inside the No. 1 pipe (30221).

9. A rock formation permeability testing device according to claim 8, characterized in that: The lifting assembly comprises a lifting rod (701) and a sealing groove (702); the sealing groove (702) is provided on the No. 1 water pipe (3021) and is coaxial with the No. 2 water pipe (3022); a sealing cover plate (703) is installed on the sealing groove (702); one end of the lifting rod (701) is fixedly connected to the No. 2 pipe (30222), and the other end of the lifting rod (701) is connected to the sealing cover plate (703) via a telescopic assembly (704).

10. A rock formation permeability testing device according to claim 2, characterized in that: The oil bag 1 (403) is provided with a sealing plate (80) at one end of the outer ring of the second tube (30222) close to the bottom of the test hole (101); one end of the sealing plate (80) is connected to the oil bag 1 (403) via a torsion spring (801).

11. A rock formation permeability testing device according to claim 9, characterized in that: The telescopic component (704) is an electric telescopic rod.

12. A method for testing rock formation permeability, characterized in that: The rock formation permeability testing device described in any one of claims 1 to 11 is used, and specifically comprises the following steps: The casing (102) is lowered, and a drilling operation is performed on the test formation by means of a drilling rig and the core in the test hole (101) is taken out; Lowering the water pumping pipe (302) into the test hole (101), and installing the water stop module (40) in the test hole (101); Close valve No. 1 (303), open valve No. 2 (502), and start the high-pressure water pump (501) to flush the test hole (101); Open the water-stop device to fit and seal with the wall of the test hole (101); Close the second valve (502), open the first valve (303), and start the water pump (301) to pump water from the test hole (101) of the sealing part; after confirming that the water in the test hole (101) is drained, turn off the water pump (301); The measuring module (60) is restarted to monitor the water seepage data of the test hole (101).

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