Ground stress testing device and method based on rock core and borehole structure

Abstract

The invention relates to the technical field of crustal stress testing, and provides a crustal stress testing device and method based on a rock core and borehole structure, the device comprises a U-shaped frame, a drilling box used for drilling a rock stratum, a drilling box used for drilling a rock stratum, a drilling box used for drilling a rock stratum, a drilling box used for drilling a rock stratum, a drilling box used for drilling a rock stratum, and a drilling box used for drilling a rock stratum and a drilling box used for drilling a rock stratum, and an adjusting assembly is arranged in the U-shaped frame, and two moving plates are slidably arranged on the outer side wall of the U-shaped frame. The test box is used for testing stratum ground stress, the test box is composed of a drilling assembly, a protection assembly and a test assembly, a driving assembly and an adjusting assembly are used in cooperation, a first motor drives a driving rod to rotate, and the driving rod drives a second driven chain wheel to rotate through a second driving chain wheel and a second chain; and the second screw drives the screw cylinders to slide in the sliding grooves, so that the heights of the four corners of the bottom of the U-shaped frame are adjusted, the U-shaped frame is in a stable state, subsequent drilling operation is facilitated, and the effect of convenient adjustment is achieved.

Description

Technical Field

[0001] The present invention relates to the field of in-situ stress testing, and more particularly, to an in-situ stress testing device and method based on core and borehole structures. Background Art

[0002] In-situ stress testing is an important parameter for engineering rock mass stability analysis and engineering design, mainly obtained through actual measurement. Especially in areas with strong tectonic activities and complex terrain undulations, since stress cannot be directly measured, only the change values of physical quantities such as displacement and strain caused by stress changes can be measured, and then the stress value is inversely calculated based on a certain assumption. The in-situ stress testing methods include: stress relief method, stress recovery method, and hydraulic fracturing method. When using the hydraulic fracturing method for testing, first drill a deep hole to the required position, use an expandable rubber packer to seal a section of the borehole, pump liquid to pressurize this section of the borehole, and record the change of hydraulic pressure over time. When the pressure increases to the point where the rock mass of the borehole wall ruptures, the pressure drops. After stabilizing for a period of time, stop pressurizing. When the pressure drops to a certain value, end the test. According to the test results, draw a "pressure-time relationship curve" and calculate the in-situ stress value according to the elastic mechanics theory.

[0003] The Chinese utility model patent with the patent number CN203688112U discloses an in-situ stress testing device, including a polyurethane rod, a connecting shaft, a left end cover, a right end cover, a high-pressure pipe, and a liquid pressurizing device. The connecting shaft is located in the center of the polyurethane rod and both ends of the connecting shaft extend out of the polyurethane rod. The left end cover is fixed to the left end of the polyurethane rod, and the right end cover is fixed to the right end of the polyurethane rod. The connecting shaft is provided with a liquid injection hole. One end of the liquid injection hole is connected to the liquid pressurizing device through the high-pressure pipe, and the other end of the liquid injection hole is connected to the inside of the polyurethane rod. A pressure gauge is provided on the liquid pressurizing device. The in-situ stress testing device of the present invention has a simple structure, is easy to use, and can accurately measure the in-situ stress in coal and rock masses without power supply.

[0004] When the above patent and the prior art are used to test in-situ stress, although they are easy to use and can accurately measure the in-situ stress in coal and rock masses without power supply, when drilling geological formations such as cores and boreholes, due to the inconsistent ground height, the drilling angle will deviate, thus affecting the subsequent test results. After drilling is completed, when the testing device enters the inside of the borehole, due to the instability of the rock formation, the rock on the inner wall of the borehole will fall off, making the testing device unable to reach the designated depth. Moreover, when the testing device reaches the designated depth, the rock on the inner wall of the borehole falls off, which will damage the testing device, thus affecting the in-situ stress test results, and there are certain drawbacks. Summary of the Invention

[0005] The object of the present invention is to provide a ground stress testing device based on core and wellbore structures, which has the advantages of being easy to adjust, quickly reaching the specified depth and preventing damage. It solves the problems that when drilling geological formations such as cores and wellbores, due to the inconsistent ground height, the drilling angle deviates, affecting the subsequent test results. After drilling is completed, when the testing device enters the drill hole, due to the instability of the rock formation, the rock on the inner wall of the drill hole will fall off, preventing the testing device from reaching the specified depth. And when the testing device reaches the specified depth, the rock on the inner wall of the drill hole falls off, damaging the testing device and affecting the ground stress test results.

[0006] Another object of the present invention is to provide a testing method for a ground stress testing device based on core and wellbore structures, which can adjust the device to a flat state and perform ground stress testing on the formation, solving the problem that the uneven formation leads to deviation of the drilling angle, thereby affecting the ground stress test results, making the ground stress test more in line with the actual situation and obtaining more accurate and reliable ground stress data.

[0007] To solve the above technical problems, the technical solution adopted in this application is as follows:

[0008] In the first aspect, an embodiment of the present application provides a ground stress testing device based on core and wellbore structures, including a U-shaped frame. Inside the U-shaped frame, there are a driving component and an adjusting component. The driving component is connected to the adjusting component. On the outer side wall of the U-shaped frame, two moving plates are slidably arranged, and both moving plates are connected to the driving component. The driving component is used to provide power for the movement of the adjusting component and the moving plates. The adjusting component is used to adjust the heights of the four corners at the bottom of the U-shaped frame. A drilling box, which is connected to one moving plate and is used for drilling the rock formation. A testing box, which is connected to the other moving plate and is used for testing the ground stress of the formation. The testing box is composed of a drilling-in component, a protection component and a testing component. The drilling-in component is used to crush the remaining rock inside the drill hole so that the testing component can reach the testing position. The protection component is used to prevent the rock on the inner wall of the drill hole from falling onto the surface of the testing component during the operation of the drilling-in component. The testing component is used to test the ground stress inside the drill hole.

[0009] In some embodiments of the present invention, a control panel is fixedly connected to the surface of the above U-shaped frame. The control panel is used to control the drilling box, the driving component, the adjusting component, the testing component and the drilling-in component. Two through grooves are opened on the outer side wall of the U-shaped frame. Inside both through grooves, there are sliding blocks. Two first screw rods are rotatably connected inside the U-shaped frame. One end of each of the two first screw rods is sleeved with a first driven sprocket. One end of each of the two sliding blocks is connected to a moving plate respectively, and the other end is threadedly connected to a first screw rod respectively.

[0010] In some embodiments of the present invention, the above-mentioned driving assembly includes a first motor fixedly connected to the top of the U-shaped frame, the output end of the first motor is fixedly connected to a driving rod, one end of the driving rod is provided with two first driving sprockets, and the other end is provided with four second driving sprockets, and the two first driving sprockets are respectively connected to a first driven sprocket through a first chain.

[0011] In some embodiments of the present invention, the interior of the U-shaped frame is fixedly connected to a protective shell, and the adjusting component includes four second screws rotatably connected to the interior of the protective shell, the surfaces of the four second screws are sleeved with second driven sprockets, and the four second driven sprockets are respectively connected to a second driving sprocket through a second chain; four sliding grooves are also provided at the bottom of the U-shaped frame, and the adjusting component also includes four screw barrels slidably connected in the sliding grooves, the four screw barrels are respectively threadedly connected to the bottom of a second screw, and the bottoms of the four screw barrels are fixedly connected to support blocks.

[0012] In some embodiments of the present invention, the above-mentioned drilling assembly includes a second motor fixedly connected to the inner wall of the test box, and the output end of the second motor is fixedly connected to a worm gear. The drilling assembly also includes a rotating rod rotatably connected to the inside of the test box, and a worm gear is fixedly sleeved on the surface of the rotating rod. The worm gear and the worm gear are meshed for transmission, and a drill bit is fixedly connected to the bottom of the transmission rod.

[0013] In some embodiments of the present invention, the above-mentioned protective component includes a first gear fixedly mounted on the surface of the worm and a first air cylinder fixedly connected to the inside of the test box, the first air cylinder is slidably connected to the inside of the first air cylinder, the bottom of the first tooth plate is fixedly connected to a piston plate, the first tooth plate is meshed with the first gear for transmission, one end of the first air cylinder is fixedly connected to a first air inlet pipe, the bottom of the test box is fixedly connected to a protective airbag, and the first air inlet pipe and the protective airbag are connected.

[0014] In some embodiments of the present invention, the above-mentioned test assembly includes a suction pump fixedly connected to the inside of the test box and a rotating rod rotatably connected to the inside of the test box, water inlet pipes are provided at both ends of the suction pump, and a surface fixed sleeve of the rotating rod is provided with a plurality of rotating plates and two second gears. The inside of the test box is fixedly connected to a protective plate through a support rod, and a plurality of rotating plates are arranged inside the protective plate. The top of the protective plate is fixedly connected to a water inlet pipe, and the bottom of the protective plate is fixedly connected to a water outlet pipe.

[0015] In some embodiments of the present invention, the above-mentioned test assembly also includes two second air cylinders fixedly connected to the inside of the test box and two occluders fixedly connected to the surface of the rotating rod, the inside of the two second air cylinders are slidably connected with a second gear plate, the two second gear plates are respectively engaged with a second gear for transmission, the bottom of the two second air cylinders are fixedly connected to a second air inlet pipe, and the ends of the two second air inlet pipes away from the second air cylinders are respectively connected to a occluder.

[0016] In some embodiments of the present invention, the above-mentioned first driving sprocket and second driving sprocket are both provided with switching components. A plurality of conductive cylinders are fixedly connected to the surface of the driving rod through support rods. A plurality of fixing holes are formed in the surface of the driving rod. The switching component includes an L-shaped electromagnet fixedly connected inside the first driving sprocket and the second driving sprocket and a magnetic block slidably connected inside the first driving sprocket and the second driving sprocket. One end of the L-shaped electromagnet abuts against the surface of the conductive cylinder. One end of the magnetic block away from the L-shaped electromagnet is fixedly connected with a fixing rod, and the shape of the fixing rod is adapted to the shape of the plurality of fixing holes.

[0017] Second aspect, an embodiment of the present application provides a testing method for a ground stress testing device based on a core and a wellbore structure, including the following steps: S1. Move the U-shaped frame to the position to be tested, drive the adjusting component to operate through the driving component, and adjust the whole U-shaped frame to a flat state; S2. Move the drilling box to the required position, drive the drilling box to move through the driving component, so that the drilling box drills the rock formation. After drilling is completed, drive the drilling box to return to the initial state through the driving component; S3. Move the testing box to the same vertical height as the drilling position, drive the testing box to move through the driving component. When there is an obstacle inside the drilling hole, crush the obstacle through the drilling component, and then move the testing component to the required position; S4. To prevent the rock on the inner wall of the drilling hole from falling and damaging the testing component, the drilling component drives the protection component to operate when it is operating, so that the protection component blocks the inner wall of the drilling hole to prevent the rock on the inner wall of the drilling hole from falling and damaging the testing component; S5. When the testing component moves to the required position, the testing component starts to operate to test the ground stress inside the drilling hole.

[0018] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0019] 1. By the combined use of the driving component and the adjusting component, the conductive cylinder is energized, so that the L-shaped electromagnet is energized to generate a repulsive force, and then the magnetic block drives the fixing rod into the fixing hole. Then, the driving rod is rotated by the first motor, and the driving rod drives the second driven sprocket to rotate through the second driving sprocket and the second chain, so that the second screw rod drives the screw cylinder to slide in the chute, thereby adjusting the height of the four corners at the bottom of the U-shaped frame, so that the U-shaped frame is in a stable state, facilitating subsequent drilling operations, and thus achieving the effect of easy adjustment.

[0020] 2. By the combined use of the driving component and the drilling component, the first motor drives the first driving sprocket and the first chain to rotate through the driving rod, so that the first driven sprocket drives the screw block to move through the first screw rod, and the moving plate drives the testing box to move. When encountering foreign objects, the second motor drives the worm gear to rotate through the worm, and the worm gear drives the rotating rod and the drill bit to rotate, so that the drill bit crushes the foreign objects, and then the foreign objects no longer block the movement of the testing component, thus achieving the effect of quickly reaching the specified depth.

[0021] 3. Through the combined use of the drilling assembly and the protection assembly, the worm drives the first toothed plate to move through the first gear. The first toothed plate enables the gas inside the first air cylinder to enter the protection airbag through the first air inlet pipe via the piston plate. As a result, the protection airbag quickly inflates and its outer wall rapidly adheres to the inner wall of the drill hole, thereby preventing falling foreign objects from damaging the test assembly and achieving the effect of preventing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Structural schematic of a ground stress testing device based on core and borehole structures provided for the embodiment Figure 1 ;

[0024] Figure 2 Structural schematic of a ground stress testing device based on core and borehole structures provided for the embodiment Figure 2 ;

[0025] Figure 3 Structural schematic diagram of the drive assembly of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0026] Figure 4 Structural schematic diagram of the test box of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0027] Figure 5 Structural schematic diagram of the adjustment assembly of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0028] Figure 6 Cross-sectional view of the test box of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0029] Figure 7 Internal structural schematic diagram of the test box of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0030] Figure 8 Partial cross-sectional view of the rotating rod of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0031] Figure 9Cross-sectional view of the protective disk of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0032] Figure 10 Schematic diagram of the first toothed plate structure of a ground stress testing device based on core and borehole structures provided for the embodiment;

[0033] Figure 11 Schematic diagram of the switching component structure of a ground stress testing device based on core and borehole structures provided for the embodiment.

[0034] Icons: 1 - U-shaped frame; 11 - Control panel; 12 - Through groove; 121 - Screw block; 122 - Moving plate; 123 - Drilling box; 124 - Testing box; 13 - Protective shell; 14 - First screw; 141 - First driven sprocket; 2 - Driving component; 21 - First motor; 22 - Driving rod; 221 - First driving sprocket; 222 - First chain; 223 - Second driving sprocket; 224 - Second chain; 3 - Adjusting component; 31 - Second screw; 311 - Second driven sprocket; 32 - Screw barrel; 321 - Support block; 4 - Drilling component; 41 - Second motor; 411 - Worm; 42 - Rotating rod; 421 - Drill bit; 422 - Worm gear; 5 - Protective component; 51 - First gear; 52 - First air delivery cylinder; 521 - First toothed plate; 522 - Piston plate; 523 - First intake pipe; 53 - Protective airbag; 6 - Testing component; 61 - Suction pump; 611 - Water inlet pipe; 612 - Water outlet pipe; 62 - Rotating rod; 621 - Rotating plate; 622 - Second gear; 63 - Protective disk; 64 - Second air delivery cylinder; 641 - Second toothed plate; 642 - Second intake pipe; 65 - Plugging device; 7 - Switching component; 71 - L-shaped electromagnet; 72 - Magnet block; 721 - Fixed rod. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0038] Example 1

[0039] Please refer to Figures 1-11 , Figure 1 The structure of the embodiment of the present application is shown as follows Figure 1 ; Figure 2 The structure of the embodiment of the present application is shown as follows Figure 2 ; Figure 3 The figure shows a schematic diagram of the structure of the driving component 2 according to an embodiment of the present application; Figure 4 Shown is a schematic diagram of the structure of the test box 124 according to an embodiment of the present application; Figure 5 The figure shows a schematic diagram of the structure of the regulating component 3 according to the embodiment of the present application; Figure 6 Shown is a cross-sectional view of a test box 124 according to an embodiment of the present application; Figure 7 The figure shows the internal structure of the test box 124 according to the embodiment of the present application; Figure 8 The figure shows a partial cross-sectional view of the rotating rod of the embodiment of the present application; Figure 9 Shown is a cross-sectional view of the protective plate 63 according to an embodiment of the present application; Figure 10 The figure shows a schematic diagram of the structure of the first tooth plate 521 according to an embodiment of the present application; Figure 11 Shown is a schematic diagram of the structure of the switching component 7 according to an embodiment of the present application.

[0040] The embodiment of the present application provides a ground stress testing device based on a core and a wellbore structure, including a U-shaped frame 1, a driving component 2 and an adjusting component 3 are arranged inside the U-shaped frame 1, the driving component 2 is connected to the adjusting component 3, two moving plates 122 are slidingly arranged on the outer wall of the U-shaped frame 1, and the two moving plates 122 are both connected to the driving component 2, the driving component 2 is used to provide power to the movement of the adjusting component 3 and the moving plate 122, the adjusting component 3 is used to adjust the height of the four corners of the bottom of the U-shaped frame 1, and a drilling box 123 is provided. The drilling box 123 is connected to the A movable plate 122 is connected for drilling a rock formation, and a test box 124 is connected to another movable plate 122 for testing the ground stress of the formation. The test box 124 is composed of a drilling component 4, a protective component 5 and a test component 6. The drilling component 4 is used to crush the rocks remaining inside the borehole so that the test component 6 reaches the test position. The protective component 5 is used to prevent the rocks on the inner wall of the borehole from falling to the surface of the test component 6 during the operation of the drilling component 4. The test component 6 is used to test the ground stress inside the borehole.

[0041] The driving assembly 2 includes a first motor 21 fixedly connected to the top of the U-shaped frame 1, and the output end of the first motor 21 is fixedly connected to a driving rod 22. One end of the driving rod 22 is sleeved with two first driving sprockets 221, and the other end is sleeved with four second driving sprockets 223. The two first driving sprockets 221 are respectively connected to a first driven sprocket 141 through a first chain 222.

[0042] The U-shaped frame 1 is fixedly connected to the inside of the protective shell 13, and the adjustment component 3 includes four second screws 31 rotatably connected to the inside of the protective shell 13. The surfaces of the four second screws 31 are sleeved with second driven sprockets 311, and the four second driven sprockets 311 are respectively connected to a second driving sprocket 223 through a second chain 224. The bottom of the U-shaped frame 1 is also provided with four slide grooves, and the adjustment component 3 also includes four screw barrels 32 slidably connected in the slide grooves. The four screw barrels 32 are respectively threadedly connected to the bottom of a second screw 31, and the bottoms of the four screw barrels 32 are fixedly connected to support blocks 321.

[0043] The first driving sprocket 221 and the second driving sprocket 223 are both provided with a switching assembly 7. The surface of the driving rod 22 is fixedly connected to a plurality of conductive tubes through a support rod. The surface of the driving rod 22 is provided with a plurality of fixing holes. The switching assembly 7 includes an L-shaped electromagnet 71 fixedly connected to the inside of the first driving sprocket 221 and the second driving sprocket 223 and a magnetic block 72 slidably connected to the inside of the first driving sprocket 221 and the second driving sprocket 223. One end of the L-shaped electromagnet 71 abuts against the surface of the conductive tube, and one end of the magnetic block 72 away from the L-shaped electromagnet 71 is fixedly connected to a fixing rod 721. The shape of the fixing rod 721 is adapted to the shapes of the plurality of fixing holes.

[0044] When in use, the conductive tube is energized to make the L-shaped electromagnet 71 energized to generate repulsive force, so that the magnetic block 72 drives the fixing rod 721 to enter the fixing hole, and then the first motor 21 drives the driving rod 22 to rotate, and the driving rod 22 drives the second driven sprocket 311 to rotate through the second active sprocket 223 and the second chain 224, so that the second screw rod 31 drives the screw barrel 32 to slide in the slide groove, thereby adjusting the height of the four corners of the bottom of the U-shaped frame 1, so that the U-shaped frame 1 is in a stable state.

[0045] Example 2

[0046] Please refer to Figures 1-11 Based on Example 1, this Example 2 provides a further technical solution.

[0047] A control panel 11 is fixedly connected to the surface of the U-shaped frame 1, and two through grooves 12 are provided on the outer wall of the U-shaped frame 1. Screw blocks 121 are slidably connected in the two through grooves 12. Two first screw rods 14 are rotatably connected inside the U-shaped frame 1. One end of the two first screw rods 14 is sleeved with a first driven sprocket 141. One end of the two screw blocks 121 is respectively connected to a movable plate 122, and the other end is respectively threadedly connected to a first screw rod 14.

[0048] It should be noted that a moving component is provided inside the moving plate 122. The moving component includes a third motor fixedly connected to one side of the moving plate 122. The output end of the third motor is fixedly connected with a third screw rod. A screw plate is threadedly connected to the surface of the third screw rod. The surface of the screw plate is fixedly connected with a drilling box 123 and a testing box 124 respectively. A drilling machine is provided inside the drilling box 123.

[0049] During use, when the drilling box 123 or the testing box 124 needs to move, the third motor drives the third screw rod to rotate. The third screw rod drives the drilling box 123 or the testing box 124 to move to a suitable position through the screw plate, and then the ground is drilled through the drilling machine.

[0050] Embodiment 3

[0051] Please refer to Figures 4-11 , on the basis of the above embodiment, this Embodiment 3 provides a further technical solution.

[0052] The drilling component 4 includes a second motor 41 fixedly connected to the inner wall of the testing box 124. The output end of the second motor 41 is fixedly connected with a worm 411. The drilling component 4 further includes a rotating rod rotatably connected inside the testing box 124. A worm gear 422 is fixedly sleeved on the surface of the rotating rod. The worm gear 422 is in meshing transmission with the worm 411. The bottom of the transmission rod 42 is fixedly connected with a drill bit 421.

[0053] During use, start the switching component 7 inside the first driving sprocket 221. The first motor 21 drives the first driving sprocket 221 and the first chain 222 to rotate through the driving rod 22, so that the first driven sprocket 141 drives the screw block 121 to move through the first screw rod 14, and the moving plate 122 drives the testing box 124 to move. When encountering a foreign object, the second motor 41 drives the worm gear 422 to rotate through the worm 411. The worm gear 422 drives the rotating rod and the drill bit 421 to rotate, so that the drill bit 421 crushes the foreign object, and thus the foreign object no longer blocks the movement of the testing component 6.

[0054] Embodiment 4

[0055] Please refer to Figures 4-10 , on the basis of the above embodiment, this Embodiment 4 provides a further technical solution.

[0056] The protection component 5 includes a first gear 51 fixedly sleeved on the surface of the worm 411 and a first air delivery cylinder 52 fixedly connected inside the test box 124. A first toothed plate 521 is slidably connected inside the first air delivery cylinder 52. A piston plate 522 is fixedly connected to the bottom of the first toothed plate 521. The first toothed plate 521 is in meshing transmission with the first gear 51. One end of the first air delivery cylinder 52 is fixedly connected to a first air inlet pipe 523. A protection airbag 53 is fixedly connected to the bottom of the test box 124. The first air inlet pipe 523 is communicated with the protection airbag 53.

[0057] It should be noted that a one-way valve is provided at the interface between the first air inlet pipe 523 and the protection airbag 53.

[0058] During use, when the second motor 41 drives the worm 411 to rotate, the worm 411 drives the first toothed plate 521 to move through the first gear 51. The first toothed plate 521 enables the gas inside the first air delivery cylinder 52 to enter the protection airbag 53 through the first air inlet pipe 523 via the piston plate 522. Thereby, the protection airbag 53 rapidly collides, and the outer wall of the protection airbag 53 quickly fits against the inner wall of the drilling hole, thereby preventing the dropped foreign objects from damaging the test component 6.

[0059] Embodiment 5

[0060] Please refer to Figures 6-10 , based on the above embodiment, this Embodiment 5 provides a further technical solution.

[0061] The test component 6 includes a suction pump 61 fixedly connected inside the test box 124 and a rotating rod 62 rotatably connected inside the test box 124. Water inlet pipes 611 are provided at both ends of the suction pump 61. A plurality of rotating plates 621 and two second gears 622 are fixedly sleeved on the surface of the rotating rod 62. A protection disk 63 is fixedly connected inside the test box 124 through a support rod. A plurality of rotating plates 621 are arranged inside the protection disk 63. A water inlet pipe 611 is fixedly communicated with the top of the protection disk 63. A water outlet pipe 612 is fixedly communicated with the bottom of the protection disk 63.

[0062] The test component 6 further includes two second air delivery cylinders 64 fixedly connected inside the test box 124 and two plugging devices 65 fixedly connected to the surface of the rotating rod. Second toothed plates 641 are slidably connected inside the two second air delivery cylinders 64. The two second toothed plates 641 are respectively in meshing transmission with a second gear 622. Second air inlet pipes 642 are fixedly communicated with the bottoms of the two second air delivery cylinders 64. The ends of the two second air inlet pipes 642 far from the second air delivery cylinders 64 are respectively communicated with a plugging device 65.

[0063] It should be noted that a one-way valve is provided at the interface between the second air inlet pipe 642 and the plugging device 65, and a pressure sensor is provided at the top end of the plugging device 65 located at the bottom.

[0064] In use, when the plugging device 65 reaches the designated position, connect the water inlet pipe 611 to a water source, and use the suction pump 61 to transport the water source through the water inlet pipe 611 at the other end to the protection plate 63. The water source drives the rotating rod 62 to rotate through the rotating plate 621, causing the second gear 622 to drive the second toothed plate 641 to move. As a result, the gas inside the second air cylinder 64 enters the plugging device 65 through the second air inlet pipe 642, causing the plugging device 65 to come into contact with the inner wall of the drilled hole. The water source enters the two plugging devices 65 through the water outlet pipe 612. As the water source is continuously injected, the pressure sensors detect the pressure inside the two plugging devices 65 to test the in-situ stress inside the drilled hole.

[0065] Embodiment 6

[0066] Please refer to Figures 1-11 , based on the above embodiments, this embodiment provides a testing method for an in-situ stress testing device based on core and borehole structures, including the following steps:

[0067] S1. Move the U-shaped frame 1 to the position to be tested, and drive the adjustment component 3 to operate through the drive component 2 to adjust the entire U-shaped frame 1 to a flat state;

[0068] S2. Move the drilling box 123 to the required position, drive the drilling box 123 to move through the drive component 2 to drill the rock formation with the drilling box 123. After drilling is completed, drive the drilling box 123 to return to its initial state through the drive component 2;

[0069] S3. Move the test box 124 to the same vertical height as the drilling position, drive the test box 124 to move through the drive component 2. When there is an obstruction inside the drilled hole, crush the obstruction through the drilling component 4, and then move the test component 6 to the required position;

[0070] S4. To prevent the rock on the inner wall of the drilled hole from falling and damaging the test component 6, the drilling component 4 drives the protection component 5 to operate during operation, so that the protection component 5 blocks the inner wall of the drilled hole to prevent the rock on the inner wall of the drilled hole from falling and damaging the test component 6;

[0071] S5. When the test component 6 moves to the required position, the test component 6 starts to operate to test the in-situ stress inside the drilled hole.

[0072] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A geostress testing device based on a core and a wellbore structure, characterized in that: include: A U-shaped frame, wherein a driving assembly and an adjusting assembly are arranged inside the U-shaped frame, wherein the driving assembly is connected to the adjusting assembly, and two movable plates are slidably arranged on the outer side wall of the U-shaped frame, wherein both movable plates are connected to the driving assembly, wherein the driving assembly is used to provide power to the movement of the adjusting assembly and the movable plates, and wherein the adjusting assembly is used to adjust the height of the four corners of the bottom of the U-shaped frame; A drilling box, the drilling box is connected to one of the movable plates and is used for drilling holes in the rock formation; A test box, the test box is connected to another of the movable plates and is used to test the formation stress; The test box consists of a drilling component, a protective component and a test component. The drilling component is used to crush the rocks remaining inside the borehole so that the test component reaches the test position. The protective component is used to prevent the rocks on the inner wall of the borehole from falling to the surface of the test component during the operation of the drilling component. The test component is used to test the ground stress inside the borehole.

2. A geostress testing device based on a core and a wellbore structure according to claim 1, characterized in that: A control panel is fixedly connected to the surface of the U-shaped frame, and two through grooves are provided on the outer wall of the U-shaped frame, and screw blocks are slidably connected in the two through grooves. Two first screw rods are rotatably connected inside the U-shaped frame, and one end of the two first screw rods is sleeved with a first driven sprocket, and one end of the two screw blocks is respectively connected to one of the movable plates, and the other end is respectively threadedly connected to one of the first screw rods.

3. A geostress testing device based on a core and a wellbore structure according to claim 2, characterized in that: The driving assembly includes a first motor fixedly connected to the top of the U-shaped frame, the output end of the first motor is fixedly connected to a driving rod, one end of the driving rod is sleeved with two first driving sprockets, and the other end is sleeved with four second driving sprockets, and the two first driving sprockets are respectively connected to the first driven sprocket through a first chain.

4. A geostress testing device based on a core and a wellbore structure according to claim 3, characterized in that: A protective shell is fixedly connected to the inside of the U-shaped frame, and the adjusting component includes four second screws rotatably connected to the inside of the protective shell, and the surfaces of the four second screws are respectively provided with second driven sprockets, and the four second driven sprockets are respectively connected to the second driving sprocket through second chains; four sliding grooves are also provided at the bottom of the U-shaped frame, and the adjusting component also includes four screw barrels slidably connected to the sliding grooves, and the four screw barrels are respectively threadedly connected to the bottom of the second screw, and the bottoms of the four screw barrels are fixedly connected to support blocks.

5. The in-situ stress testing device based on a core and a wellbore structure according to claim 1, characterized in that: The drilling assembly includes a second motor fixedly connected to the inner wall of the test box, a worm is fixedly connected to the output end of the second motor, the drilling assembly also includes a rotating rod rotatably connected to the inside of the test box, a worm wheel is fixedly sleeved on the surface of the rotating rod, the worm wheel is meshed with the worm for transmission, and a drill bit is fixedly connected to the bottom of the transmission rod.

6. The in-situ stress testing device based on a core and a wellbore structure according to claim 5, characterized in that: The protection component includes a first gear fixedly mounted on the surface of the worm and a first air cylinder fixedly connected to the inside of the test box, a first tooth plate is slidably connected to the inside of the first air cylinder, a piston plate is fixedly connected to the bottom of the first tooth plate, the first tooth plate is meshed with the first gear for transmission, one end of the first air cylinder is fixedly connected to a first air inlet pipe, the bottom of the test box is fixedly connected to a protection airbag, and the first air inlet pipe is connected to the protection airbag.

7. The in-situ stress testing device based on a core and a wellbore structure according to claim 5, characterized in that: The test assembly includes a suction pump fixedly connected to the inside of the test box and a rotating rod rotatably connected to the inside of the test box, water inlet pipes are provided at both ends of the suction pump, a plurality of rotating plates and two second gears are fixedly sleeved on the surface of the rotating rod, a protective plate is fixedly connected to the inside of the test box through a support rod, a plurality of rotating plates are arranged inside the protective plate, the top of the protective plate is fixedly connected to the water inlet pipe, and the bottom of the protective plate is fixedly connected to the water outlet pipe.

8. The in-situ stress testing device based on a core and a wellbore structure according to claim 7, characterized in that: The test assembly also includes two second air cylinders fixedly connected to the inside of the test box and two pluggers fixedly connected to the surface of the rotating rod. The insides of the two second air cylinders are slidably connected with second gear plates, and the two second gear plates are respectively meshed with one of the second gears for transmission. The bottoms of the two second air cylinders are fixedly connected with second air inlet pipes, and the ends of the two second air inlet pipes away from the second air cylinders are respectively connected to one of the pluggers.

9. The in-situ stress testing device based on a core and a wellbore structure according to claim 3, characterized in that: The first driving sprocket and the second driving sprocket are both provided with a switching assembly, the surface of the driving rod is fixedly connected to a plurality of conductive tubes through a support rod, a plurality of fixing holes are opened on the surface of the driving rod, the switching assembly includes an L-shaped electromagnet fixedly connected to the inside of the first driving sprocket and the second driving sprocket and a magnetic block slidably connected to the inside of the first driving sprocket and the second driving sprocket, one end of the L-shaped electromagnet abuts against the surface of the conductive tube, and the end of the magnetic block away from the L-shaped electromagnet is fixedly connected to a fixing rod, and the shape of the fixing rod is adapted to the shapes of the plurality of fixing holes.

10. A testing method of the in-situ stress testing device based on a core and a wellbore structure according to any one of claims 1 to 9, comprising the following steps: S1. Move the U-shaped frame to the position to be tested, and drive the adjustment component to operate through the drive component to adjust the U-shaped frame as a whole to a flat state; S2. Move the drilling box to the desired position, drive the drilling box to move through the driving assembly, and allow the drilling box to drill a hole in the rock formation. After the drilling is completed, the driving assembly drives the drilling box to return to its initial state; S3. Move the test box to the same vertical height as the drilling position, drive the test box to move through the drive assembly, and when there is an obstacle inside the drill hole, crush the obstacle through the drilling assembly, thereby moving the test assembly to the desired position; S4. To prevent rocks on the inner wall of the borehole from falling and damaging the test assembly, the drilling assembly drives the protection assembly to operate during operation, so that the protection assembly blocks the inner wall of the borehole to prevent rocks on the inner wall of the borehole from falling and damaging the test assembly; S5. When the test assembly moves to the desired position, the test assembly starts to operate to test the ground stress inside the borehole.

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