Water injection test device and operation method for fault mud debris zone in borehole

Abstract

The present invention discloses a water injection test device for a fault muddy debris zone in a borehole. It includes a pipe clamping device for fixing a water injection pipe, a test device for performing a water injection test on the borehole, and an air bag device for pressing the test pipe in the test device into and out of the fault muddy debris zone; the pipe clamping device is located on the ground and is installed on the upper end of the water injection pipe of the test device; the air bag device is installed on the outer wall of the water injection bottom pipe of the test device; the upper end of the test device extends upward out of the borehole, and the lower end is located at the fault muddy debris zone. The present invention solves the problem that surveyors are currently unable to measure the permeability coefficient parameters of the fault muddy debris zone in the borehole due to the lack of effective instruments; it has the advantage of being able to accurately measure the permeability coefficient of the fault muddy debris zone. The present invention discloses an operating method of a water injection test device for a fault muddy debris zone in a borehole.

Description

Technical Field

[0001] The present invention relates to the technical field of borehole in-situ testing, and more specifically to a water injection testing device for a muddy debris zone in a borehole fault layer. The present invention also relates to an operating method of the water injection testing device for a muddy debris zone in a borehole fault layer. Background Art

[0002] Borehole in-situ testing is one of the important means of geotechnical engineering investigation. The borehole in-situ test data represents the true parameter index of the original position of the rock and soil layer. The authenticity of the test data plays a vital role in the design work. The water injection test is an in-situ test method to determine the permeability coefficient of the rock and soil layer. It is divided into the borehole constant water head injection test and the borehole reduced water head injection test.

[0003] The borehole water injection test requires drilling with a drill first, and the upper non-test section is often isolated by casing, and then the lower test section is subjected to water injection test. The fault mud debris zone is often located at a deep depth in the borehole, and the casing cannot reach the depth of the test section. In addition, the fault mud debris zone is mostly fault mud and debris, and the fault material is loose and broken. Mud or other materials are often used for wall protection during the drilling process. The wall protection material blocks the pores in the fault mud debris zone, resulting in distortion of the test results of ordinary in-situ hydrogeological tests and affecting the accuracy of the test results. The acquisition of the permeability coefficient parameters of the fault mud debris zone is related to the calculation of the sudden water inrush of the project and the safety of the project construction. Therefore, it is necessary to develop a water injection test device for the fault mud debris zone in the borehole. Summary of the invention

[0004] The first purpose of the present invention is to provide a water injection test device for the muddy debris zone of the fault in the borehole. The device can perform a water injection test on the muddy debris zone of the fault in the borehole by pumping (inflating) air in the airbag device and pressing the test section of the flower tube into the muddy debris zone of the fault. The operation is simple; the problem that the current prior art cannot measure the permeability coefficient parameters of the muddy debris zone of the fault in the borehole due to the lack of effective instruments is solved.

[0005] The second object of the present invention is to provide an operating method for a water injection test device for a fault muddy debris zone in a borehole.

[0006] In order to achieve the first purpose of the present invention, the technical scheme of the present invention is: a water injection test device for a fault mud debris zone in a borehole, characterized in that it includes a pipe clamping device for fixing a water injection pipe, a test device for performing a water injection test on the borehole, and an airbag device for inflating or exhausting an airbag to press the test flower pipe in the test device into and out of the fault mud debris zone; the pipe clamping device completes the fixing function of the water injection pipe through a latch; the airbag device is connected to the test device, and the test flower pipe in the test device is pressed into and out of the fault mud debris zone by inflating or exhausting the airbag in the airbag device; after the test device presses the test flower pipe into the fault mud debris zone by inflating and exhausting the airbag, water is injected into the water injection pipe to complete the water injection test;

[0007] The pipe clamping device is located on the ground and installed on the upper end of the water injection pipe of the test device;

[0008] The air bag device is installed on the outer wall of the water-filled bottom pipe of the test device;

[0009] The upper end of the test device extends upward from the borehole, and the lower end is located at the fault mud zone.

[0010] In the above technical solution, the pipe clamping device includes a latch, a caliper and a pulley. The pulley is installed at the bottom of the caliper to enable the pipe clamping device to move to both sides. The latch is in an inverted cone shape. The latch is inserted between the caliper and the water injection pipe to prevent the water injection pipe from falling into the hole.

[0011] The caliper is a hollow rectangular parallelepiped structure, the hollow part of the caliper is circular, the diameter of the hollow circle is larger than the diameter of the water injection pipe, the water injection pipe passes through the caliper and is fixed to the caliper by a pin;

[0012] The right-angle edge surface where the latch pin contacts the water injection pipe is serrated.

[0013] In the above technical solution, the airbag device includes an air pump, an air pipe and an airbag, and the airbags are respectively installed on the two side walls of the water-filled bottom pipe of the test device;

[0014] The air pump is connected to the air bag through an air pipe; the air pump is located on the ground; the air bag is evacuated and contracted by the air pump, and inflated and expanded to press the test flower tube into the fault mud debris zone.

[0015] In the above technical solution, the test device includes a joint, a water injection pipe, a water injection bottom pipe, a reducer, a test flower pipe and a thin-walled ring blade;

[0016] The upper end of the water injection pipe extends upward from the drilled hole, and the lower end is connected to the water injection bottom pipe; the water injection bottom pipe is a tubular structure with an open upper end and a closed bottom;

[0017] The joint is arranged at the upper end of the water injection pipe;

[0018] The water injection bottom pipe is vertically connected to the test flower pipe through a reducer; the thin-walled ring blade is connected to the test flower pipe through a thread; the thin-walled ring blade and the test flower pipe are pressed into the fault mud debris zone under the pressure of the air bag, and water enters the test flower pipe through the water injection pipe to perform a water injection test;

[0019] There are multiple rows of circular holes distributed on the test flower tube;

[0020] The cutting edge of the thin-walled ring blade is inclined outward at an angle of 5° to 10°.

[0021] In the above technical solution, the diameters of the thin-walled ring blade and the test flower tube can be adjusted according to the width of the fault mud debris zone, and the corresponding sizes can be selected;

[0022] The test flower tube is connected to the water injection pipe through a variable diameter thread. A suitable variable diameter joint is selected according to the diameter of the test flower tube to connect with the water injection pipe, and water can enter the test flower tube through the water injection pipe.

[0023] In order to achieve the second object of the present invention, the technical solution of the present invention is: the operation method of the water injection test device for the muddy debris zone in the borehole fault is characterized by comprising the following steps:

[0024] Step 1: Drilling;

[0025] After drilling to the final hole depth using a drilling core tube, the core tube is pulled out;

[0026] Step 2: Installation;

[0027] According to the fault width determined by the drill core, a test flower tube, a thin-walled ring blade and a reducer of appropriate size are selected; the thin-walled ring blade, the test flower tube and the reducer are connected by threads and then installed by threads on the side of the water injection bottom pipe; the upper part of the water injection bottom pipe is connected to the water injection pipe by threads to form a test device;

[0028] The airbags are fixedly installed on both sides of the water-injected bottom pipe, the connecting line of the airbags on both sides is parallel to the axis of the test flower pipe, the upper part of the airbag is connected to the air pipe, and the air pipe is connected to the upper air pump;

[0029] Step 3: Place the test device into the borehole;

[0030] Place the test device and the airbag device into the drilled hole, pass the upper water injection pipe through the caliper, insert a latch into the gap between the water injection pipe and the caliper, and fix the test device in the drilled hole;

[0031] Connect a water injection pipe to the upper part of the water injection pipe through threads, connect the top of the water injection pipe to a joint, connect the active rod of the drilling rig to the joint, pull out the caliper, lower the test device to the depth of a water injection pipe through the drilling rig, insert the pin again in the gap between the water injection pipe and the caliper, and fix the test device in the borehole; remove the active rod of the drilling rig, unscrew the joint, connect a water injection pipe to the upper part of the water injection pipe through threads, connect the active rod of the drilling rig to the joint again, pull out the caliper, and lower the test device again through the drilling rig;

[0032] According to the fault location revealed by the drilling, repeat the above step 3 and lower the test device to the corresponding location.

[0033] Step 4: Press the water injection tube into the fault mud debris zone;

[0034] After the test device is lowered to the corresponding position in the borehole, the air pump is started to evacuate the airbag on one side of the test flower tube and inflate the airbag on the other side; under the thrust of the airbag, the thin-walled ring blade first cuts the muddy debris zone of the fault, and then the test flower tube enters the muddy debris zone, and the pipe clamping device is driven by the water injection pipe and moves to the side away from the inflated airbag through the pulley.

[0035] Step 5: Water injection test;

[0036] Inject water from the orifice into the water injection pipe until the water level rises from the water injection pipe to the pipe mouth, and then conduct a water injection test according to the relevant regulations and specifications;

[0037] Step 6: Lift the test device out of the drill hole;

[0038] After the water injection test is completed, the air pump is started to inflate the airbag on one side of the test flower tube and to evacuate the airbag on the other side; under the thrust of the airbag, the test flower tube withdraws from the mud debris zone, and the pipe clamping device moves to the same side driven by the water injection pipe;

[0039] Connect the joint to the top of the water injection pipe, connect the active rod of the drilling rig to the joint, pull out the caliper, lift the water injection pipe through the drilling rig, repeat the above work several times, and then lift the test device out of the hole.

[0040] The water injection test device for the muddy debris zone of the fault layer in the borehole has the following technical effects:

[0041] (1) Strong applicability; for different widths of fault mud debris zones, thin-walled annular blades and test flower tubes of different diameters can be selected and connected to the water injection pipe through a variable diameter connecting pipe, which is suitable for water injection tests of mud debris zones of various widths; the water injection pipe in the present invention is provided with connecting threads at both the upper and lower ends, which can be connected to multiple water injection pipes, thereby extending the length of the water injection pipe, and can be used to perform water injection tests on fault mud debris zones of different depths; it is also suitable for obtaining the permeability coefficients of soil layers at different depths, and has a wide range of applications; the present invention is also suitable for permeability tests of various soil layers (clay, silty soil or sand) at different depths in a borehole, and for determining the permeability coefficient K value of the soil layer at different depths;

[0042] (2) Accurately implement water injection test; the device uses the existing air pump to inflate and exhaust the air bag, and through the principle of air bag inflation and air extraction and compression, the water injection flower tube is accurately pressed into the fault mud debris zone for testing, and the permeability coefficient of the fault mud debris zone can be accurately measured; solve the problem that the water injection test cannot be accurately carried out due to a large amount of cementitious material attached to the borehole wall, and the permeability coefficient of the fault mud debris zone is too large due to the lack of effective instrument measurement;

[0043] (3) Easy to operate; a pulley is installed under the clamp in the pipe clamping device, so that the pipe clamping device can drive the water injection pipe to move to both sides of the hole wall, which is convenient for helping the water injection pipe enter the fault mud debris zone; a thin-walled ring blade is installed at the front end of the water injection pipe, which is conducive to cutting the material in the fault mud debris zone and helping the water injection pipe enter the fault mud debris zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the working structure of the present invention placed in a borehole.

[0045] Figure 2 It is a schematic diagram of the working structure during the test process of the present invention.

[0046] Figure 3 It is a schematic structural diagram of the pipe clamping device in the present invention.

[0047] Figure 4 It is a top view of the pipe clamping device in the present invention.

[0048] Figure 5 It is the water injection pipe of the test device in the present invention.

[0049] Figure 6 It is a schematic diagram of the structure of the test device in the present invention.

[0050] Figure 7 It is a schematic diagram of the structure of the joint in the present invention.

[0051] Figure 8 It is a schematic structural diagram of the reducer in the present invention.

[0052] Fig. 9 It is a schematic diagram of the structure of the test flower tube in the present invention.

[0053] Fig.10 It is a schematic diagram of the structure of the present invention.

[0054] exist Figure 1 , Figure 2 In the figure, A represents bedrock; B represents fault mud debris zone; and C represents water level line.

[0055] exist Figure 2 In the figure, E stands for cup and F stands for water.

[0056] In the figure, 1-pipe clamping device, 1-1-latch, 1-2-caliper, 1-3-pulley, 2-air bag device, 2-1-air pump, 2-2-air pipe, 2-3-rubber air bag, 3-test device, 3-1-connector, 3-2-water injection pipe, 3-3-reducing connector, 3-4-test flower pipe, 3-5-test flower pipe, 3-6-thin-wall ring blade. DETAILED DESCRIPTION

[0057] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings, but they do not constitute a limitation of the present invention and are only given as examples. At the same time, the advantages of the present invention are made clearer and easier to understand through the description.

[0058] Referring to the attached drawings, it can be seen that a water injection test device for the muddy debris zone of the fault layer in the borehole comprises three major parts: a pipe clamping device, an airbag device and a test device, wherein the airbag device is welded to the test device.

[0059] The pipe clamping device 1 comprises a latch 1-1, a caliper 1-2 and a pulley 1-3. The caliper 1-2 is a hollow rectangular parallelepiped steel body, the hollow part is circular, the diameter of the hollow circle is larger than the diameter of the water injection pipe 3-2, and the water injection pipe 3-2 can pass through it; the latch 1-1 is a triangular rubber block, in order to prevent the water injection pipe 3-2 from falling into the borehole during the upper and lower water injection pipes 3-2 and the water injection test process, the latch 1-1 is inserted into the gap between the water injection pipe 3-2 and the caliper 1-2, and the right-angled edge surface of the latch 1-1 in contact with the water injection pipe 3-2 is serrated, which can increase the friction between the latch 1-1 and the water injection pipe 3-2; the pulley 1-3 is installed below the caliper 1-2 through a rotating shaft, so that the pipe clamping device can move left and right with the water injection pipe.

[0060] The airbag device 2 includes an air pump 2-1, an air pipe 2-2, and an airbag 2-3. The air pump 2-1 is a commercially available pumping and inflating device; the air pipe 2-2 is a commercially available rubber tube that can withstand a certain pressure, and the joint position of the air pipe 2-2 and the airbag 2-3 can be connected by a threaded seal; the airbag 2-3 is made of rubber material, which is in a contracted state when not inflated and in an expanded state when inflated. The contraction and expansion of the airbag 2-3 can press the test flower tube 3-5 into the fault mud debris zone.

[0061] The test device 3 includes a joint 3-1, a water injection pipe 3-2, a water injection bottom pipe 3-3, a reducer 3-4, a test flower pipe 3-5 and a thin-walled annular blade 3-6. The upper part of the joint 3-1 is a screw rod, which can be connected to the drill rod of the drilling rig. The lower part of the joint 3-1 is a built-in thread, and the diameter matches the diameter of the water injection pipe 3-2. The joint 3-1 is connected to the drill rod through the upper part, and the lower part is connected to the water injection pipe 3-2, so that the test device can be lifted and placed into the borehole through the drilling rig; the water injection pipe 3-2 has a variety of lengths, including: 0.5m, 1.0m, 1.5m, 2.0m, 2.5m, 3.0m, and each water injection pipe 3-2 is connected to each other by a thread. The length and number of water injection pipes 3-2 required in the borehole are determined according to the test depth; the water injection bottom pipe 3-3 is fixedly connected to the airbag 2-3, and the bottom of the water injection bottom pipe 3-3 The reducer 3-4 is closed, with a circular hole on the side and an internal thread in the circular hole; both sides of the reducer 3-4 are external threads, one side matches the internal thread of the circular hole on the side of the water injection bottom pipe 3-3, and the other side matches the internal thread of the test flower pipe 3-5. The reducer 3-4 connects the water injection bottom pipe 3-3 and the test flower pipe 3-5; the test flower pipe 3-5 is distributed with multiple rows of circular holes, and water can penetrate into the mud debris zone from the holes; the test flower pipe 3-5 is connected to the thin-walled ring blade 3-6 by threads, and the cutting edge of the thin-walled ring blade 3-6 is inclined outward at an angle of 5° to 10°, and the thin-walled ring blade 3-6 can quickly cut into the mud debris zone of the fault through the cutting edge.

[0062] Referring to the attached drawings, it can be seen that an operating method of a water injection test device for a fault muddy debris zone in a borehole includes the following steps.

[0063] Step 1: Drilling;

[0064] After drilling to the final hole depth using a drilling core tube, the core tube is pulled out;

[0065] Step 2: Installation;

[0066] According to the fault width determined by the drill core, a test flower pipe 3-5, a thin-walled ring blade 3-6 and a reducer 3-4 of appropriate size are selected, and after the thin-walled ring blade 3-6, the test flower pipe 3-5 and the reducer 3-4 are connected by threads, they are installed by threaded connection on the side of the water injection bottom pipe 3-3, and the upper part of the water injection bottom pipe 3-3 is connected to the water injection pipe 3-2 by threads to form a test device 3.

[0067] The airbags 2-3 are fixedly installed on both sides of the water injection bottom pipe 3-3, and the connecting line of the airbags 2-3 on both sides is parallel to the axis of the test flower tube 3-5. The upper part of the airbags 2-3 is connected to the air pipe 2-2, and the air pipe 2-2 is connected to the upper air pump 2-1.

[0068] Step 3: Place the test device into the borehole;

[0069] The test device 3 and the airbag device 2 are placed in the drilled hole, the upper water injection pipe 3-2 passes through the caliper 1-2, and the pin 1-1 is inserted into the gap between the water injection pipe 3-2 and the caliper 1-2 to fix the test device in the drilled hole.

[0070] Connect a water injection pipe 3-2 to the upper part of the water injection pipe 3-2 through a thread, connect the top of the water injection pipe 3-2 to the joint 3-1, connect the drilling rig active rod to the joint 3-1, pull out the caliper 1-2, lower the test device 3 to the depth of a water injection pipe 3-2 through the drilling rig, and then insert the pin 1-1 into the gap between the water injection pipe 3-2 and the caliper 1-2 again to fix the test device 3 in the drill hole; remove the drilling rig active rod, unscrew the joint 3-1, connect a water injection pipe 3-2 to the upper part of the water injection pipe 3-2 through a thread, connect the drilling rig active rod to the joint 3-1 again, pull out the caliper 1-2, and lower the test device 3 again through the drilling rig.

[0071] According to the fault position revealed by the drilling, repeat the above step 3 and lower the test device 3 to the corresponding position.

[0072] Step 4: Press the water injection tube into the fault mud debris zone;

[0073] After the test device 3 is lowered to the corresponding position in the borehole, the air pump 2-1 is started to evacuate the airbag 2-3 on one side of the test flower tube 3-5 and inflate the airbag 2-3 on the other side; under the thrust of the airbag 2-3, the thin-walled ring blade 3-6 first cuts the fault mud debris zone, and then the test flower tube 3-5 enters the mud debris zone, and the pipe clamping device 1 is driven by the water injection pipe 3-2 and moves to the side away from the inflated airbag 2-3 through the pulley 1-3.

[0074] Step 5: Water injection test;

[0075] Inject water from the orifice into the water injection pipe 3-2 until the water level rises from the water injection pipe 3-2 to the pipe mouth, and then conduct a water injection test according to relevant regulations and specifications.

[0076] Step 6: Lift the test device out of the drill hole;

[0077] After the water injection test is completed, the air pump 2-1 is started to inflate the airbag 2-3 on one side of the test flower tube 3-5 and to evacuate the airbag 2-3 on the other side; under the thrust of the airbag 2-3, the test flower tube 3-5 withdraws from the mud debris zone, and the pipe clamping device moves to the same side driven by the water injection pipe 3-2.

[0078] The top of the water injection pipe 3-2 is connected to the joint 3-1, and the active rod of the drilling rig is connected to the joint 3-1. The caliper 1-2 is pulled out, and the water injection pipe 3-2 is lifted by the drilling rig. After repeating the above work several times, the test device 3 is lifted out of the hole.

[0079] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

[0080] Other parts not described belong to the prior art.

Claims

1. A water injection test device for the fault muddy debris zone in the borehole, Features: It comprises a pipe clamping device (1) for fixing a water injection pipe, a test device (3) for conducting a water injection test on a borehole, and an air bag device (2) for pressing a test pipe in the test device into and out of a fault mud debris zone; The pipe clamping device (1) is located on the ground and is installed on the upper end of the water injection pipe (3-2) of the test device (3); The airbag device (2) is installed on the outer wall of the water injection bottom pipe (3-3) of the test device (3); The upper end of the test device (3) extends upward from the borehole, and the lower end is located at the fault mud zone; The test device (3) comprises a joint (3-1), a water injection pipe (3-2), a water injection bottom pipe (3-3), a reducer (3-4), a test flower pipe (3-5) and a thin-walled ring blade (3-6); The upper end of the water injection pipe (3-2) extends upward from the drilled hole, and the lower end is connected to the water injection bottom pipe (3-3); the water injection bottom pipe (3-3) is a tubular structure with an open upper end and a closed bottom; The joint (3-1) is arranged at the upper end of the water injection pipe (3-2); The water injection bottom pipe (3-3) is vertically connected to the test flower pipe (3-5) through a reducer (3-4); the thin-walled ring blade (3-6) is connected to the test flower pipe (3-5) through a thread; The test flower tubes (3-5) are provided with multiple rows of circular holes; The cutting edge of the thin-walled ring cutting edge (3-6) is inclined outwards at an angle of 5° to 10°.

2. The water injection test device for the muddy debris zone in the borehole according to claim 1, Features: The pipe clamping device (1) comprises a latch (1-1), a clamp (1-2) and a pulley (1-3), wherein the pulley (1-3) is installed at the bottom of the clamp (1-2); the latch (1-1) is in an inverted cone shape; the latch (1-1) is inserted between the clamp (1-2) and the water injection pipe (3-2); The caliper (1-2) is a hollow rectangular parallelepiped structure, the hollow part of the caliper (1-2) is circular, and the diameter of the hollow circle is larger than the diameter of the water injection pipe (3-2); The right-angled edge surface where the latch pin (1-1) contacts the water injection pipe (3-2) is in a sawtooth shape.

3. The water injection test device for the muddy debris zone in the borehole according to claim 2, Features: The airbag device (2) comprises an air pump (2-1), an air pipe (2-2) and an airbag (2-3), and the airbag (2-3) is respectively installed on the two side walls of the water injection bottom pipe (3-3) of the test device (3); The air pump (2-1) is connected to the air bag (2-3) via the air tube (2-2).

4. The water injection test device for the muddy debris zone in the borehole according to claim 3, Features: The diameters of the thin-walled ring blade (3-6) and the test flower tube (3-5) are adjusted according to the width of the fault mud debris zone; The test flower tube (3-5) is connected to the reducer (3-4) via a variable diameter thread.

5. The method for operating the water injection test device for the muddy debris zone in the fault layer of the borehole according to any one of claims 1 to 4, Features: The following steps are included: Step 1: Drilling; After drilling to the final hole depth using a drilling core tube, the core tube is pulled out; Step 2: Installation; According to the fault width determined by the drill core, a test flower tube (3-5), a thin-walled ring blade (3-6) and a reducer (3-4) of suitable size are selected; the thin-walled ring blade (3-6), the test flower tube (3-5) and the reducer (3-4) are connected by threads and then installed by threads on the side of the water injection bottom pipe (3-3); the upper part of the water injection bottom pipe (3-3) is connected to the water injection pipe (3-2) by threads to form a test device (3); The airbags (2-3) are fixedly installed on both sides of the water injection bottom pipe (3-3), the connecting line of the airbags (2-3) on both sides is parallel to the axis of the test flower tube (3-5), the upper part of the airbag (2-3) is connected to the air pipe (2-2), and the air pipe (2-2) is connected to the upper air pump (2-1); Step 3: Place the test device into the borehole; The test device (3) and the airbag device (2) are placed in the drilled hole, the upper water injection pipe (3-2) passes through the caliper (1-2), and the latch (1-1) is inserted into the gap between the water injection pipe (3-2) and the caliper (1-2), so as to fix the test device (3) in the drilled hole; Connect a water injection pipe (3-2) to the upper part of the water injection pipe (3-2) through a thread, connect the top of the water injection pipe (3-2) to the joint (3-1), connect the active rod of the drilling rig to the joint (3-1), pull out the caliper (1-2), lower the test device (3) to the depth of a water injection pipe (3-2) through the drilling rig, insert the pin (1-1) into the gap between the water injection pipe (3-2) and the caliper (1-2) again, and fix the test device (3) in the drill hole; remove the active rod of the drilling rig, unscrew the joint (3-1), connect a water injection pipe (3-2) to the upper part of the water injection pipe (3-2) through a thread, connect the active rod of the drilling rig to the joint (3-1) again, pull out the caliper (1-2), and lower the test device (3) again through the drilling rig; According to the fault position revealed by the drilling, repeat the above step 3 and lower the test device (3) to the corresponding position; Step 4: Press the water injection tube into the fault mud debris zone; After the test device (3) is lowered to the corresponding position in the borehole, the air pump (2-1) is started to work, the air bag (2-3) on one side of the test flower tube (3-5) is evacuated, and the air bag (2-3) on the other side is inflated; under the thrust of the air bag (2-3), the thin-walled ring blade (3-6) first cuts the fault mud debris zone, and then the test flower tube (3-5) enters the mud debris zone, and the pipe clamping device (1) is driven by the water injection pipe (3-2) and moves to the side away from the inflated air bag (2-3) through the pulley (1-3); Step 5: Water injection test; Inject water from the orifice into the water injection pipe (3-2) until the water level rises from the water injection pipe (3-2) to the pipe mouth, and then conduct a water injection test according to relevant regulations and specifications; Step 6: Lift the test device out of the drill hole; After the water injection test is completed, the air pump (2-1) is started to inflate the airbag (2-3) on one side of the test flower tube (3-5), and to evacuate the airbag (2-3) on the other side; under the thrust of the airbag (2-3), the test flower tube (3-5) withdraws from the mud debris zone, and the pipe clamping device moves to the same side driven by the water injection pipe (3-2); The top of the water injection pipe (3-2) is connected to the joint (3-1), the active rod of the drilling rig is connected to the joint (3-1), the caliper (1-2) is pulled out, and the water injection pipe (3-2) is lifted by the drilling rig. After repeating the above work several times, the test device (3) is lifted out of the hole.

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