Deep ground stress while drilling test system

Abstract

The invention discloses a deep ground stress while-drilling test system, and belongs to the field of ground stress test. A deep ground stress while-drilling test system comprises a drill bit and a drill rod fixedly connected to the drill bit, the drill rod is provided with at least two sections, the deep ground stress while-drilling test system further comprises an opening and closing assembly, the opening and closing assembly is arranged at the connecting end of the drill rod in an array mode, the output end of the opening and closing assembly is fixedly connected with a protection plate, and the protection plate is composed of a plurality of arc-shaped plates; and the ground stress detectors are arranged in the protection plates, and when the opening and closing assembly is opened, the multiple protection plates are synchronously unfolded outwards and drive the ground stress detectors to ascend to be attached to the rock walls and conduct ground stress detection. The opening and closing assembly and the supporting assembly are matched, the protection plates are tightly attached to the rock walls at the two ends of the test section after being unfolded, and the ground stress detection is conducted. And a stable supporting structure is formed, so that the testing section is prevented from being interfered by external factors, the pressure balance at the two ends of the testing section is ensured, and the accuracy of a monitoring result of the ground stress detector is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of geostress testing, and in particular to a deep geostress while-drilling testing system. Background Art

[0002] Geostress testing is an important parameter for engineering rock mass stability analysis and engineering design, which is mainly obtained by actual measurement, especially in areas with strong tectonic activities and complex terrain. Since stress cannot be measured directly, it can only be measured by measuring the change values ​​of physical quantities such as displacement and strain caused by stress changes, and then the stress value is calculated based on some assumptions. Therefore, all stress measurement methods used at home and abroad are to drill holes or grooves on the wall of the adit or the surface outcrop to cause stress disturbance, and then use probes to measure the change values ​​of various physical quantities caused by stress disturbance. The deep geostress test-while-drilling device can measure and record the stress state of the formation in real time during the drilling process, providing key formation information for drilling engineers, so as to adjust drilling parameters in time, prevent drilling accidents, and optimize drilling processes. The device combines modern sensor technology, data acquisition and processing technology, and drilling engineering technology, and has the characteristics of high precision, high reliability, and real-time performance.

[0003] After searching, the Chinese patent publication (announcement) number CN101581219B discloses a device for measuring geostress while drilling, including a drilling rig, a drill rod and a drill bit. A pressure sensor is provided on the side wall of the drill rod connected to the drill bit near the drill bit. The drill rod is also provided with a sliding cover to protect the pressure sensor, and the sliding cover is slid open and closed by a driving device. A method for measuring geostress while drilling is also disclosed, including the following steps: selecting a position to be measured, and drilling a hole with a geostress while drilling measurement device; stopping the machine after drilling the hole, so that the drill rod is separated from the drilling rig, and then directly connecting the pressure sensor to the signal processing device, and then sliding the sliding cover open to expose the pressure sensor through the sliding cover driving device; and measuring the geostress of the coal seam through the pressure sensor. The present invention can stop drilling at any time to measure geostress, can be conveniently used underground, can measure continuously in a measuring hole, measure accurately and in a short time, and can measure the geostress of soft coal seams.

[0004] In the prior art, the following deficiencies exist in the process of measuring geostress while drilling: the current geostress detection device cannot support both ends of the detection section when performing geostress while drilling detection on deep geostress, and there is a risk of interference from factors such as weathering and collapse during the detection process. In addition, the pressure on both sides of the test section is inconsistent, so the results measured by the geostress detector will be seriously affected and cannot accurately reflect the true stress state of the rock mass. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that when detecting ground stress while drilling, the two ends of the detection section cannot be supported and protected, and the pressure at both ends of the detection section is inconsistent, resulting in inaccurate detection results. A deep ground stress while drilling testing system is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A deep geostress while-drilling testing system comprises a drill bit and a drill rod fixedly connected to the drill bit, wherein the drill rod is provided with at least two sections, and further comprises: an opening and closing assembly, wherein an array of the opening and closing assemblies is arranged on a connecting end of the drill rod, wherein a protective plate fixedly connected to an output end of the opening and closing assembly, and the protective plate is composed of a plurality of arc-shaped plates, wherein when the opening and closing assembly is closed, the plurality of protective plates are combined into a column, and both ends are sealed and connected to the drill rod, a support assembly arranged in an array on a connecting surface of the drill rod, and the free end of the support assembly is fixedly connected to an inner wall of the protective plate, and a geostress detector arranged inside the protective plate, wherein when the opening and closing assembly is opened, the plurality of protective plates are synchronously expanded outwards, and the support assembly cooperates with the opening and closing assembly to support the expanded protective plate, and drives the geostress detector to rise to fit the rock wall and perform geostress detection.

[0007] In order to drive the protective plate to unfold, preferably, the opening and closing assembly includes: an electric push rod, an output shaft is arranged inside the electric push rod, the output end of the output shaft is movably connected with a pull plate through a rotating part, a second connecting rod is penetrated through the output end of the pull plate, an outer connecting plate is fixedly installed on the connecting surface of the protective plate, the second connecting rod is rotatably installed inside the outer connecting plate, an opening and closing base is fixedly installed on the drill pipe, two first rotating rods are relatively arranged at one end of the opening and closing base, the two first rotating rods are movably connected with a movable seat, and the electric push rod is fixedly installed on the movable seat.

[0008] In order to rotate and unfold the protective plate, preferably, the rotating part includes a sleeve rod fixedly connected to the free end of the output shaft, a first connecting rod is rotatably installed inside the sleeve rod, an inner rotating plate and an outer rotating plate are correspondingly provided on both sides of the first connecting rod, the inner rotating plates on both sides are fixedly connected with a driving rod, and the driving rod is movably installed inside the pull plate.

[0009] Furthermore, a rotating shaft is provided through one end of the pulling plate, a limiting bracket is fixedly installed on the opening and closing base, the rotating shaft is rotatably installed inside the limiting bracket, movable rods are fixedly connected on both sides of the limiting bracket, the movable rods are movably arranged inside the outer rotating plate, the limiting bracket is fixedly connected to a limiting plate, and the limiting plate limits the outer rotating plate.

[0010] In order to support the unfolded protective plate, further, the supporting assembly includes a supporting base, the supporting base is fixedly connected to the fitting surface of the drill pipe, a second rotating rod is fixedly connected to the supporting base, a supporting plate is rotatably installed outside the second rotating rod, a third connecting rod is penetrated at the free end of the supporting plate, an inner connecting plate is provided on the inner wall of the protective plate, and the third connecting rod is movably installed inside the inner connecting plate.

[0011] In order to pull the sliding tooth plate to move when unfolding, further, two sliding rails are fixedly connected to the inner walls of the drill rod on both sides, and a sliding tooth plate is slidably arranged inside the sliding rails. A fourth connecting rod is fixedly connected to the outer side of the sliding tooth plate, and a pull rod is rotatably installed on the fourth connecting rod. A third rotating rod is passed through the free end of the pull rod, and a push-pull base is provided on the inner wall of the protective plate, and the third rotating rod is rotatably installed inside the push-pull base.

[0012] Furthermore, pads are fixedly connected to the slide rails on both sides, a plurality of limit rods are arranged on the pads, and a rotating gear is rotatably mounted on the outer wall of the limit rod, and the rotating gear is mounted on the sliding gear plate through a caliper meshing.

[0013] In order to make the ground stress detector rise for detection when unfolded, further, a screw is fixedly connected to the rotating gear, and a matching rod is installed on the screw rod through threaded engagement. A mounting plate is fixedly connected to several of the matching rods, and the ground stress detector is fixedly installed in the mounting plate.

[0014] In order to ensure the overall sealing of the drill pipe, further, a plurality of adsorption grooves are provided on the connecting surface of the protective plate on one side, and the interior of the adsorption grooves is made of ferromagnetic metal material, and a plurality of magnetic blocks are provided on the connecting surface of the protective plate on the other side, and the magnetic blocks and the adsorption grooves are symmetrically arranged and adsorbed on each other.

[0015] Furthermore, a sealing frame is arranged on the protective fitting surface, and the magnetic block is arranged in the sealing frame.

[0016] Compared with the prior art, the present invention provides a deep ground stress while drilling test system, which has the following beneficial effects: 1. The deep geostress drilling test system ensures the stability of both ends of the protective plate and enhances stability through the coordination between the opening and closing components and the support components. After the protective plate is unfolded, it fits tightly on the rock walls at both ends of the test section to form a stable support structure. This support not only prevents the test section from being disturbed by external factors during the detection process, but also ensures that the pressure on the rock walls on both sides of the test section is balanced, ensuring the accuracy of the monitoring results of the geostress detector.

[0017] 2. The deep geostress drilling test system can minimize the error and uncertainty factors in the test process by controlling the extension and retraction degree of the electric push rod. On the one hand, the balanced pressure on both sides ensures that the geostress detector can work in a stable and reliable environment. On the other hand, the precise pressure control avoids the distortion of the measurement results caused by excessive or insufficient pressure.

[0018] 3. The deep geostress drilling test system drives the sliding tooth plates on both sides to move while the protective plates are unfolded. The moving distance of the sliding tooth plates is controlled as the degree of unfolding of the protective plates increases. When the geostress detector rises, the distance that the protective plates move to fit the rock wall can be accurately determined. The geostress detector can be brought close to the rock wall to reach the predetermined position to perform geostress detection on the rock wall.

[0019] 4. The deep geostress drilling test system uses the magnetic block and sealing frame set on the contact surface of the protective plate to make the protective plate and the drill pipe a sealed whole during the drilling process, ensuring the sealing of the entire sealing cavity. At the same time, the protective plate protects the geostress detector, which is convenient for multi-stage detection.

[0020] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention controls the deployment of the protective plate through the opening and closing assembly, so that the protective plate fits tightly on the rock wall at both ends of the test section, which not only provides support for the rock wall, but also balances the pressure at both ends of the test section, thereby ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a deep geostress while-drilling test system proposed by the present invention; Figure 2 Schematic diagram of the internal structure of the protective plate of a deep ground stress while drilling test system proposed by the present invention Figure 1 ; Figure 3 A deep ground stress while drilling test system proposed by the present invention Figure 2 Enlarged view of point B in the middle; Figure 4 A deep ground stress while drilling test system proposed by the present invention Figure 1 Enlarged view of point A in the middle; Figure 5 A schematic diagram of the support assembly structure of a deep geostress while-drilling test system proposed by the present invention; Figure 6 A deep ground stress while drilling test system proposed by the present invention Figure 5 Enlarged view of point D in the middle; Figure 7 Schematic diagram of the internal structure of the protective plate of a deep ground stress while drilling test system proposed by the present invention Figure 2 ; Figure 8 A deep ground stress while drilling test system proposed by the present invention Figure 7 Enlarged view of point C in the middle; Fig. 9 A schematic diagram of the structure above the pad of a deep ground stress while drilling test system proposed by the present invention; Fig.10 The present invention provides a structural schematic diagram of a geostress detector for a deep geostress while-drilling test system.

[0022] In the figure: 1, drill bit; 11, drill rod; 12, protective plate; 121, magnetic block; 122, sealing frame; 123, adsorption groove; 2, opening and closing assembly; 21, opening and closing base; 22, first rotating rod; 23, movable seat; 24, electric push rod; 25, output shaft; 26, sleeve rod; 27, first connecting rod; 28, inner rotating plate; 29, pull plate; 210, rotating shaft; 211, limiting bracket; 212, outer rotating plate; 213, movable rod; 214, limiting plate; 215, second Connecting rod; 216, outer connecting plate; 217, driving rod; 3, supporting assembly; 31, supporting base; 32, second rotating rod; 33, supporting plate; 34, third connecting rod; 35, inner connecting plate; 4, pulling rod; 41, push-pull base; 42, third rotating rod; 43, fourth connecting rod; 44, sliding tooth plate; 45, sliding rail; 46, rotating gear; 47, limiting rod; 48, pad; 49, screw rod; 410, matching rod; 411, mounting plate; 5, ground stress detector. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Embodiment 1:

[0026] Reference Figure 1-Figure 4A deep ground stress while drilling test system includes a drill bit 1 and a drill rod 11 fixedly connected to the drill bit 1. The drill bit 1 is used to drill into the formation and is a direct tool for drilling operations. The drill rod 11 is provided with at least two sections. In this embodiment, the drill rod 11 is provided at both ends and connected to the rear of the drill bit 1. The drilling depth is extended by connecting the two sections of the drill rod 11. The system also includes: an opening and closing component 2, an array of the opening and closing components 2 is provided on the connecting end of the drill rod 11, and a protective plate 12 is fixedly connected to the output end of the opening and closing component 2. Preferably, each protective plate 12 is connected to at least one opening and closing component 2. The opening and closing assembly 2 is a combination of several arc-shaped plates, and when the opening and closing assembly 2 is closed, several protective plates 12 are combined into a column, preferably a combination of four protective plates 12. This column not only provides protection for the internal equipment, but also seals and connects the drill pipes 11 on both sides to prevent drilling fluid or mud from penetrating into the test area, ensuring the accuracy of the test, and seals and connects the drill pipes 11 on both sides. The ground stress detector 5 is set inside the protective plate 12. The ground stress detector 5 is the core part of the test system and is used to measure the ground stress deep underground in real time. The ground stress detector 5 includes components such as sensors, data acquisition systems, and data analysis software, which can accurately capture stress changes in the formation and transmit data to the ground for further analysis.

[0027] The opening and closing assembly 2 includes an electric push rod 24, which is an HLZ70 electric push rod 24. The subsequent mechanical structure is driven by controlling its extension and retraction. An output shaft 25 is arranged inside the electric push rod 24. The shaft rotates or moves linearly under the drive of the electric push rod 24 to transmit power. The output end of the output shaft 25 is movably connected with a pull plate 29 through a rotating part. A second connecting rod 215 is arranged through the output end of the pull plate 29. An outer connecting plate 216 is fixedly installed on the connecting surface of the protective plate 12. The second connecting rod 215 is rotatably installed inside the outer connecting plate 216. When the pull plate 29 moves, the protective plate 12 is driven to open and close through the second connecting rod 215. The opening and closing base 21 fixedly installed on the drill rod 11 provides stable support for the entire opening and closing assembly 2. Two first rotating rods 22 are relatively arranged at one end of the opening and closing base 21. The two first rotating rods 22 are movably connected with a movable seat 23. The electric push rod 24 is fixedly installed on the movable seat 23. The rotating part includes a sleeve rod 26 fixedly connected to the free end of the output shaft 25, and a first connecting rod 27 is rotatably installed inside the sleeve rod 26. An inner rotating plate 28 and an outer rotating plate 212 are correspondingly arranged on both sides of the first connecting rod 27. The inner rotating plates 28 on both sides are fixedly connected with driving rods 217, and the driving rod 217 is movably installed inside the pull plate 29. A rotating shaft 210 is penetrated at one end of the pull plate 29. A limiting bracket 211 is fixedly installed on the opening and closing base 21, and the rotating shaft 210 is rotatably installed inside the limiting bracket 211. The limiting bracket 211 provides support and limitation for the rotating shaft 210. Both sides of the limiting bracket 211 are fixedly connected with movable rods 213, and the movable rod 213 is movably arranged inside the outer rotating plate 212. A limiting plate 214 is fixedly connected to the limiting bracket 211, and the limiting plate 214 limits the outer rotating plate 212. The limiting plate 214 limits the outer rotating plate 212 to ensure that it does not exceed a predetermined range during movement.

[0028] Reference Figure 2-Figure 3, a plurality of adsorption grooves 123 are provided on the connecting surface of the protective plate 12 on one side, preferably at least two adsorption grooves 123 are provided, and are provided at both ends of the connecting plate of the protective plate 12, the interior of the adsorption groove 123 is made of ferromagnetic metal material, which can be attracted by the magnetic block 121, and a plurality of magnetic blocks 121 are provided on the connecting surface of the protective plate 12 on the other side, and the magnetic blocks 121 and the adsorption grooves 123 are symmetrically arranged and adsorbed to each other. In this embodiment, two magnetic blocks 121 are arranged. When the two protective plates 12 are close to each other, the magnetic blocks 121 will automatically align and be adsorbed into the adsorption grooves 123, so as to achieve a close fit between the two protective plates 12, and a sealing frame 122 is provided on the fitting surface of the protective plate 12, and the magnetic blocks 121 are arranged in the sealing frame 122. The sealing frame 122 is usually made of elastic material, such as rubber or silicone, which has good sealing and corrosion resistance. When the two protection plates 12 are adsorbed and attached to each other through the magnetic block 121 and the adsorption groove 123 , the sealing frame 122 will be compressed and fill the small gap between the two protection plates 12 , thereby ensuring the sealing of the entire sealing cavity.

[0029] In this embodiment, the test section of the drill rod 11 is set to two sections of drill rod 11, and they are connected by protective plates 12. The protective plates 12 are set to four pieces. There are two protective plates 12 with magnetic blocks 121 and fixedly connected to a sealing frame 122, and two protective plates 12 with adsorption grooves 123, and the two types of protective plates 12 are arranged crosswise up and down.

[0030] Embodiment 2:

[0031] Reference Figure 1-Figure 5, which is basically the same as the first embodiment, and further, a support assembly 3 arranged in an array on the connection surface of the drill pipe 11 is added. During the drilling process, in order to further enhance the stability and supporting force of the protective plate 12, a support assembly 3 arranged in an array on the connection surface of the drill pipe 11 is designed. The number of the support assemblies 3 corresponds to the opening and closing assembly 2. Preferably, each protective plate 12 is connected to at least one support assembly 3. These support assemblies 3 not only provide additional support for the protective plate 12, but also ensure its stability and reliability during the opening and closing process. The free end of the support assembly 3 is fixedly connected to the inner wall of the protective plate 12. The support assembly 3 is Part 3 includes a support base 31, which is fixedly connected to the fitting surface of the drill pipe 11, and a second rotating rod 32 is fixedly connected to the support base 31. A support plate 33 is rotatably mounted outside the second rotating rod 32. By allowing the support plate 33 to rotate thereon, the second rotating rod 32 provides the necessary mechanical freedom for the opening and closing of the protective plate 12. A third connecting rod 34 is provided through the free end of the support plate 33, and an inner connecting plate 35 is provided on the inner wall of the protective plate 12. The third connecting rod 34 is movably mounted inside the inner connecting plate 35. The support assembly 3 is designed in an array form and is mounted on the connecting surface of the drill pipe 11. This design enables each protective plate 12 to be supported by multiple support assemblies 3, thereby greatly improving the stability and reliability of the entire protective structure. At the same time, the array setting also helps to disperse the load, reduce the force on a single support assembly 3, and extend its service life.

[0032] Embodiment three:

[0033] Reference Figure 1-Figure 10, which is basically the same as the first embodiment. Furthermore, when the opening and closing component 2 is opened, the four protective plates 12 can be synchronously expanded outward through the coordinated action of its internal mechanical structure. During this process, the opening and closing component 2 not only controls the opening and closing action of the protective plates 12, but also ensures the synchronization and stability between the protective plates 12 through its design. The support assembly 3 cooperates with the opening and closing assembly 2, the support base 31 is fixed on the drill rod 11, and the support plate 33 connected by the second rotating rod 32 provides additional support force for the unfolded protective plate 12 under the interaction of the third connecting rod 34 at the free end of the support plate 33 and the inner connecting plate 35 on the inner wall of the protective plate 12, supports the unfolded protective plate 12, and drives the ground stress detector 5 to rise and fit the rock wall to perform ground stress detection. Two slide rails 45 are fixedly connected to the inner walls of the drill rods 11 on both sides, and a sliding tooth plate 44 is slidably provided inside the slide rail 45. A fourth connecting rod 43 is fixedly connected to the outer side of the sliding tooth plate 44. A pull rod 4 is rotatably installed on the fourth connecting rod 43, and a third rotating rod 42 is penetrated at the free end of the pull rod 4. The inner wall of the protective plate 12 is provided with The push-pull base 41, the third rotating rod 42 is rotatably installed inside the push-pull base 41, and as the protective plate 12 is unfolded, the sliding tooth plates 44 on both sides are pulled by the pull rod 4 to move in opposite directions inside the slide rail 45, and the slide rails 45 on both sides are fixedly connected with pads 48, and a plurality of limit rods 47 are arranged on the pads 48, and a rotating gear 46 is rotatably installed on the outer wall of the limit rod 47, and the rotating gear 46 is installed on the sliding tooth plate 44 through caliper engagement, and a screw rod 49 is fixedly connected to the rotating gear 46, and a matching rod 410 is installed on the screw rod 49 through threaded engagement, and a plurality of matching rods 410 are fixedly connected to the mounting plate 411, and the ground stress detector 5 is fixedly installed in the mounting plate 411, and when the sliding tooth plate 44 slides in the slide rail 45, the rotating gear 46 is driven to rotate. The screw rod 49 fixedly connected to the rotating gear 46 is installed with the matching rod 410 through threaded engagement. Therefore, when the rotating gear 46 rotates, the screw rod 49 drives the matching rod 410 to move up and down. A mounting plate 411 is fixedly connected to a plurality of matching rods 410, and the ground stress detector 5 is fixedly mounted inside the mounting plate 411. Therefore, with the lifting and lowering movement of the matching rods 410, the mounting plate 411 and the ground stress detector 5 will also rise or fall synchronously. Finally, with the rise of the ground stress detector 5, it will gradually get close to the rock wall. When it reaches the predetermined position, the ground stress detector 5 will start to work and perform ground stress detection on the rock wall. At this time, the deployment of the protective plate 12 and the supporting function of the supporting assembly 3 together provide a stable and safe working environment for the ground stress detector 5, ensuring the accuracy and reliability of the detection.

[0034] In the present invention, drilling is first performed using the drill bit 1. When entering deep underground, it is necessary to measure and record the stress state of the formation in real time to provide key formation information for drilling engineers so as to adjust drilling parameters in time, prevent drilling accidents, and optimize drilling technology. After entering the measuring section, the electric push rod 24 is first started. The electric push rod 24 drives the output shaft 25 to contract, so that the first connecting rod 27 moves backward. When the first connecting rod 27 moves, it pulls the inner rotating plate 28 to rotate backward with the movable rod 213 as the center. When the inner rotating plate 28 rotates, it drives the pull plate 29 to rotate backward with the rotating shaft 210 as the center. The pull plate 29 drives the protective plate 12 to expand outward. At the same time, the outer rotating plate 212 is driven to rotate with the movable rod 213 as the center. The outer rotating plate 212 provides support force for the pull plate 29, and through the cooperation of the limit plate 214, the maximum rotation degree of the pull plate 29 is limited.

[0035] Secondly, when the four protective plates 12 are synchronously driven to expand outward, the support plate 33 is driven to rotate. After expansion, the other end of the protective plate 12 is supported by the support plate 33 to ensure the stability of both ends of the protective plate 12 and enhance the stability. After the protective plate 12 is expanded, it fits tightly on the rock walls at both ends of the test section to form a stable support structure. This support not only prevents the test section from being disturbed by external factors (such as weathering, collapse, etc.) during the detection process, but also ensures that the pressure on the rock walls on both sides of the test section is balanced. If the pressure on both sides of the test section is inconsistent, the results measured by the ground stress detector 5 will be seriously affected and cannot accurately reflect the actual stress state of the rock mass. The electric push rod 24 can accurately control the pressure exerted by the protective plate 12 on the rock wall through its telescopic movement. This control mechanism allows the operator to adjust the contact force between the protective plate 12 and the rock wall according to actual needs, thereby ensuring that the pressure on both sides of the test section remains within a constant and acceptable range. By controlling the degree of telescopic movement of the electric push rod 24, the operator can minimize errors and uncertainties in the test process. On the one hand, the balanced pressure on both sides ensures that the ground stress detector 5 can work in a stable and reliable environment. On the other hand, precise pressure control avoids distortion of measurement results caused by excessive or insufficient pressure.

[0036] Finally, when the four protective plates 12 are unfolded, the protective plates 12 on both sides below pull the sliding tooth plates 44 on both sides to move in opposite directions through the pull rod 4. When the sliding tooth plates 44 move, the rotating gear 46 is driven to rotate through the caliper, and the rotating gear 46 drives the screw rod 49 to rotate synchronously when rotating. When the screw rod 49 rotates, it drives the mounting plate 411 to rise through the connection of the matching rod 410. The mounting plate 411 drives the ground stress detector 5 to rise and it will gradually approach the rock wall. When it reaches the predetermined position, the ground stress detector 5 will start to work and perform ground stress detection on the rock wall. At this time, the deployment of the protective plate 12 and the supporting effect of the supporting assembly 3 together provide a stable and safe working environment for the ground stress detector 5, ensuring the accuracy and reliability of the detection. After the detection is completed, the electric push rod 24 is controlled to drive the output shaft 25 to extend, so that the four protective plates 12 shrink inward, and the ground stress detector 5 drops synchronously. After the protective plate 12 is completely shrunk, it is tightly connected through the adsorption of the magnetic block 121, and through the cooperation of the sealing frame 122, it is sealed with the drill pipe 11 at both ends to ensure the sealing in subsequent drilling operations. At the same time, the ground stress detector 5 is protected by the protective plate 12, which is convenient for the next detection point to be used for detection again.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A deep geostress while-drilling testing system, comprising a drill bit (1) and a drill rod (11) fixedly connected to the drill bit (1), wherein the drill rod (11) is provided with at least two sections, characterized in that: Also includes: An opening and closing assembly (2), wherein an array of the opening and closing assemblies (2) is arranged on a connecting end of a drill rod (11), The output end of the opening and closing component (2) is fixedly connected to a protective plate (12), and the protective plate (12) is composed of a plurality of arc-shaped plates. When the opening and closing component (2) is closed, the plurality of protective plates (12) are combined into a column, and both ends are sealed and connected to the drill rod (11); A support assembly (3) is arranged in an array on a connection surface of a drill rod (11), and a free end of the support assembly (3) is fixedly connected to an inner wall of a protective plate (12); The ground stress detector (5) is arranged inside the protective plate (12). When the opening and closing assembly (2) is opened, the plurality of protective plates (12) are simultaneously unfolded outwards. The support assembly (3) cooperates with the opening and closing assembly (2) to support the unfolded protective plates (12) and drive the ground stress detector (5) to rise and fit the rock wall to perform ground stress detection.

2. A deep ground stress testing while drilling system according to claim 1, characterized in that: The opening and closing component (2) comprises: An electric push rod (24), wherein an output shaft (25) is disposed inside the electric push rod (24), an output end of the output shaft (25) is movably connected to a pull plate (29) via a rotating portion, a second connecting rod (215) is provided through the output end of the pull plate (29), an outer connecting plate (216) is fixedly mounted on the connecting surface of the protective plate (12), and the second connecting rod (215) is rotatably mounted inside the outer connecting plate (216); An opening and closing base (21) is fixedly mounted on the drill rod (11), two first rotating rods (22) are arranged opposite to each other at one end of the opening and closing base (21), the two first rotating rods (22) are movably connected to a movable seat (23), and the electric push rod (24) is fixedly mounted on the movable seat (23).

3. A deep ground stress testing while drilling system according to claim 2, characterized in that: The rotating part comprises a sleeve rod (26) fixedly connected to the free end of the output shaft (25), a first connecting rod (27) being rotatably mounted inside the sleeve rod (26), an inner rotating plate (28) and an outer rotating plate (212) being correspondingly arranged on both sides of the first connecting rod (27), a driving rod (217) being fixedly connected to the inner rotating plate (28) on both sides, and the driving rod (217) being movably mounted inside the pulling plate (29).

4. A deep ground stress testing while drilling system according to claim 3, characterized in that: A rotating shaft (210) is provided through one end of the pulling plate (29); a limiting bracket (211) is fixedly installed on the opening and closing base (21); the rotating shaft (210) is rotatably installed inside the limiting bracket (211); movable rods (213) are fixedly connected to both sides of the limiting bracket (211); the movable rods (213) are movably arranged inside the outer rotating plate (212); a limiting plate (214) is fixedly connected to the limiting bracket (211); and the limiting plate (214) limits the outer rotating plate (212).

5. The deep ground stress testing while drilling system according to claim 1, characterized in that: The support assembly (3) comprises a support base (31), the support base (31) being fixedly connected to a fitting surface of a drill rod (11), a second rotating rod (32) being fixedly connected to the support base (31), a support plate (33) being rotatably mounted outside the second rotating rod (32), a third connecting rod (34) being penetrated through a free end of the support plate (33), an inner connecting plate (35) being disposed on an inner wall of the protective plate (12), and the third connecting rod (34) being movably mounted inside the inner connecting plate (35).

6. A deep ground stress testing while drilling system according to claim 1, characterized in that: Two slide rails (45) are fixedly connected to the inner walls of the drill rod (11) on both sides, a sliding tooth plate (44) is slidably arranged inside the slide rail (45), a fourth connecting rod (43) is fixedly connected to the outer side of the sliding tooth plate (44), a pull rod (4) is rotatably mounted on the fourth connecting rod (43), a third rotating rod (42) is penetrated through the free end of the pull rod (4), a push-pull base (41) is arranged on the inner wall of the protective plate (12), and the third rotating rod (42) is rotatably mounted inside the push-pull base (41).

7. A deep ground stress testing while drilling system according to claim 6, characterized in that: Pads (48) are fixedly connected to the slide rails (45) on both sides. A plurality of limit rods (47) are arranged on the pads (48). Rotating gears (46) are rotatably mounted on the outer walls of the limit rods (47). The rotating gears (46) are mounted on the sliding toothed plate (44) through a caliper.

8. A deep ground stress testing while drilling system according to claim 7, characterized in that: A screw rod (49) is fixedly connected to the rotating gear (46), a matching rod (410) is mounted on the screw rod (49) through threaded engagement, a plurality of matching rods (410) are fixedly connected to a mounting plate (411), and the ground stress detector (5) is fixedly mounted in the mounting plate (411).

9. The deep ground stress testing while drilling system according to claim 1, characterized in that: A plurality of adsorption grooves (123) are provided on the connection surface of the protection plate (12) on one side, and the interior of the adsorption grooves (123) is made of ferromagnetic metal material. A plurality of magnetic blocks (121) are provided on the connection surface of the protection plate (12) on the other side, and the magnetic blocks (121) and the adsorption grooves (123) are symmetrically arranged and adsorbed to each other.

10. A deep geostress testing while drilling system according to claim 9, characterized in that: A sealing frame (122) is provided on the fitting surface of the protection plate (12), and the magnetic block (121) is arranged in the sealing frame (122).

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