Auxiliary device for precisely controlling angle of directional drilling in geological exploration

Abstract

The invention discloses an auxiliary device for precisely controlling the angle of geological prospecting directional drilling, and relates to the technical field of geological prospecting drilling equipment.The auxiliary device comprises a drilling tool body and a drill bit, a reaming assembly is arranged in the position, close to the bottom end, of the drilling tool body, and an adjusting cavity is formed in the bottom end of the drilling tool body; and an angle adjusting assembly is arranged in the adjusting cavity. The reaming assembly is integrated in the position, close to the bottom end, of the drilling tool body, the reaming assembly and the angle adjusting assembly are arranged in a layered mode in the axial direction, linkage control is achieved, drill bit orientation can be achieved through the angle adjusting assembly without inclination, the drilling tool body keeps a stable posture all the time, direct friction between the drilling tool body and a well wall is thoroughly avoided, and drilling efficiency is improved. Rigid blocking of the non-chambering well wall to the drill bit is eliminated in time through synchronous chambering, the drill bit is only subjected to rock breaking resistance in the deflection process, no extra interference force exists, and the drifting phenomenon is avoided fundamentally.

Description

Technical Field

[0001] This invention relates to the field of geological exploration drilling equipment technology, specifically to an auxiliary device for precise angle control in directional drilling for geological exploration. Background Technology

[0002] In directional drilling operations for geological exploration, to accurately reach target exploration layers (such as ore bodies and aquifers) that are inclined or not vertically distributed, it is necessary to dynamically adjust the drilling angle underground. This is a core requirement of directional drilling technology. However, existing directional drilling equipment generally suffers from a key technical bottleneck in achieving underground drill bit angle adjustment: insufficient adaptability between angle adjustment and wellbore enlargement operations. This leads to a series of problems such as drill string wear, drill bit drift, decreased accuracy, and low efficiency, which seriously restrict the quality and economy of exploration operations.

[0003] The primary problem is severe frictional wear between the drill string sidewall and the wellbore. In existing systems, adjusting the drill bit angle often requires tilting the entire long drill string body to deflect the drill bit trajectory. Due to the lack of a borehole reaming structure synchronized with angle adjustment, the tilted drill string sidewall directly contacts the original vertical wellbore sidewall. The high-speed rotation of the drill string during drilling causes intense friction between the two. This friction not only causes severe wear on the drill string sidewall, shortening its service life, but also generates significant frictional resistance, increasing the load on the servo motor and even potentially leading to drill string jamming, wellbore collapse, and other safety hazards.

[0004] Secondly, wellbore obstruction causes drill bit drift, significantly reducing angle control accuracy. When adjusting the angle underground, the drill bit's deflection trajectory needs to form a new wellbore profile. However, existing devices lack a synchronous reaming mechanism, so the wellbore space corresponding to the new trajectory is not expanded in time, and the drill bit is rigidly obstructed by the unreamed wellbore. This obstruction force causes the drill bit to deviate from the preset adjustment trajectory, resulting in "drift." At the same time, the obstruction force is transmitted to the angle adjustment mechanism, causing uneven stress on the adjustment components, further exacerbating the angle deviation. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An auxiliary device for precise angle control in directional drilling for geological exploration includes a drill bit body and a drill bit. The drill bit body has a hole-reaming component located inside near the bottom end, and an adjustment chamber located at the bottom end of the drill bit body. An angle adjustment component is located inside the adjustment chamber. The hole-reaming assembly includes an annular base frame. A hole-reaming connecting rod is detachably and fixedly connected to the outer wall of the annular base frame via base frame bolts. A tool holder is rotatably connected to the outer wall of the hole-reaming connecting rod. A hole-reaming cutter is detachably and fixedly connected to the bottom end of the tool holder via fastening bolts. The hole-reaming assembly also includes a vertical drive mechanism for driving the annular base frame to move vertically. The angle adjustment assembly includes a hinged ball seat fixedly connected to the inner wall of the adjustment chamber. A rotating ball is rotatably connected to the inner wall of the hinged ball seat. The bottom end of the rotating ball is fixedly connected to the center of the top end of the drill bit. An adjustment lever is rotatably connected to the top end of the rotating ball through an angle rotating rod. One end of the adjustment lever is provided with a transverse drive mechanism for driving it to rotate.

[0006] A further improvement of the technical solution of the present invention is that: the vertical drive mechanism includes a hydraulic rod, the bottom end of the hydraulic rod is fixedly connected to a telescopic end, the bottom end of the telescopic end is fixedly connected to the upper surface of the annular base frame through a connecting flange, and the housing of the hydraulic rod is fixedly connected to the inner wall of the drill body through an installation ring.

[0007] A further improvement of the technical solution of the present invention is that: the transverse driving mechanism includes an adjusting electromagnet, the outer wall of the adjusting electromagnet is fixedly connected to the inner wall of the adjusting chamber through an electromagnet mounting bracket, an adjusting iron core is movably inserted into the inner wall of the adjusting electromagnet, one end of the adjusting iron core is rotatably connected to one end of the adjusting lever, the outer wall of the adjusting lever near the top is rotatably connected to the inner wall of the adjusting chamber through a crossbar, and an angle sensor is fixedly connected to one end of the angle rotating rod.

[0008] A further improvement of the technical solution of the present invention is that: a rigid bottom tube is fixedly connected to the outer wall of the hydraulic rod near the bottom end, a rigid top tube is fixedly connected to the top end of the hydraulic rod, and a rotary sealing joint is rotatably connected to the top ends of both the rigid bottom tube and the rigid top tube.

[0009] A further improvement of the technical solution of the present invention is that: a displacement sensor is rotatably connected to the outer wall of the end of the adjusting lever near the rotating ball, and the tail end of the displacement sensor is rotatably connected to the inner wall of the adjusting chamber through a rotating seat.

[0010] A further improvement of the technical solution of the present invention is that: a return spring is sleeved on one end of the adjusting iron core, one end of the return spring is fixedly connected to one end of the adjusting electromagnet, and an electromagnetic shielding shell is fixedly sleeved on the outer wall of the adjusting electromagnet.

[0011] A further improvement of the technical solution of the present invention is that: the angle adjustment assembly further includes a sealing plate, the sealing plate is fixedly connected to the inner wall of the adjustment chamber, and the outer wall of the hinge ball seat is fixedly connected to the inner wall of the adjustment chamber.

[0012] A further improvement of the technical solution of the present invention lies in that: an under-reaming groove adapted to the tool rest is provided on the outer wall of the drill tool body near the bottom end, a slot adapted to the tool rest is provided at the top end of the under-reaming cutter, the bottom end of the tool rest is movably inserted into the inner wall of the slot through a plug rod, and one end of the fastening bolt threadedly penetrates through the plug rod.

[0013] A further improvement of the technical solution of the present invention lies in that: a rotating groove adapted to the under-reaming connecting rod is provided at the top end of the tool rest, the inner wall of the rotating groove is movably connected to the outer wall of the under-reaming connecting rod, and the top end of the tool rest is rotatably connected to the under-reaming connecting rod through a pin rod.

[0014] A further improvement of the technical solution of the present invention lies in that: a reinforcing bottom ring is fixedly connected to the bottom end of the under-reaming connecting rod, a wire passing groove is provided on the upper surface of the annular bottom frame, and a transmission gear is fixedly connected to the outer wall of the drill tool body near the top end.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by the present invention compared with the prior art is as follows: 0. The present invention provides an auxiliary device for precisely controlling the angle of directional drilling in geological exploration. The under-reaming component is integrated inside the drill tool body near the bottom end, and is arranged in layers along the axial direction with the angle adjustment component and realizes linkage control. When the angle adjustment component drives the drill bit to deflect, the hydraulic rod of the under-reaming component synchronously drives the tool rest to drive the under-reaming cutter to expand outwards, and immediately under-reams the side wall of the wellbore just drilled by the drill bit, forming a wellbore contour that completely matches the deflection trajectory of the drill bit. This synchronous under-reaming enables the drill tool body to achieve drill bit orientation through the angle adjustment component without tilting, and the drill tool body always maintains a stable posture, completely avoiding direct friction with the well wall. At the same time, the under-reamed wellbore provides sufficient activity space for the drill tool body, further eliminating frictional resistance, significantly extending the service life of the drill tool, and reducing the motor load and risk of jamming.

[0016] 1. The present invention provides an auxiliary device for precisely controlling the angle of directional drilling in geological exploration. On the one hand, synchronous under-reaming immediately eliminates the rigid blockage of the un-under-reamed well wall to the drill bit, enabling the drill bit to only be subject to rock-breaking resistance during deflection and having no additional interference force, thus avoiding the drift phenomenon at the source. On the other hand, the device adopts a universal hinge structure of a hinge ball seat and a rotating ball, providing stable deflection support for the drill bit and ensuring that the drill bit deflects precisely along the preset trajectory. With the multiple detection redundancy design of "angle sensor and double displacement sensor", real-time data of the drill bit angle, deflection of the adjustment lever, and displacement of the adjustment iron core are collected to form a precise closed-loop control, effectively reducing the influence of environmental interference on the accuracy, and significantly improving the target layer hitting accuracy.

[0017] 2. This invention provides an auxiliary device for precise angle control in directional drilling for geological exploration, realizing integrated operation of "angle adjustment - synchronous reaming - drilling". Unlike existing technologies, it eliminates the need for downtime to change reaming tools, completely saving the waiting and tool-changing time of separate operations and significantly shortening the single-well drilling cycle. Simultaneously, the reduction in drill string wear and drill bit drift damage significantly decreases the frequency of drill string and drill bit replacements, resulting in a substantial reduction in equipment maintenance costs. The synchronization of reaming and drilling also ensures smooth wellbore trajectory connection, reducing subsequent drilling resistance and further improving overall operational efficiency.

[0018] 3. This invention provides an auxiliary device for precise angle control in directional drilling for geological exploration. The outward expansion angle of the reamer is limited by the reaming groove of the drill bit body, and the outward expansion range is precisely controlled by the downward movement distance of the annular base driven by the hydraulic rod. The reaming range can be adjusted in real time according to the deflection angle of the drill bit to avoid the problems of over-reaming or under-reaming. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the hole-expanding assembly structure of the present invention; Figure 3 This is a schematic diagram of the reaming tool structure of the present invention; Figure 4 This is a schematic diagram of the angle adjustment component structure of the present invention; Figure 5 This is a schematic diagram of the adjusting electromagnet structure of the present invention; Figure 6 This is an enlarged schematic diagram of the structure at point A of the present invention; Figure 7 This is a schematic diagram of the main structure of the drill bit of the present invention; Figure 8 This is a schematic diagram of the structure of the present invention.

[0020] In the diagram: 1. Drill body; 2. Transmission gear; 3. Reaming assembly; 4. Angle adjustment assembly; 5. Drill bit; 6. Hydraulic rod; 7. Telescopic end; 8. Hardened bottom tube; 9. Hardened top tube; 10. Rotary sealing joint; 11. Reaming groove; 12. Connecting flange; 13. Annular base frame; 14. Base frame bolt; 15. Reaming connecting rod; 16. Reinforcing bottom ring; 17. Tool holder; 18. Reaming cutter; 19. Insert rod; 20. Fastening bolt; 21. Rotating groove; 22. Pin; 23. Sealing plate; 24. Hinge ball seat; 25. Rotating ball; 26. Adjusting electromagnet; 27. Electromagnet mounting bracket; 28. Adjusting iron core; 29. ​​Return spring; 30. Adjusting lever; 31. Displacement sensor; 32. Angle sensor; 33. Rotating seat. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to embodiments: Example 1, as Figure 1 - Figure 8 As shown, the present invention provides an auxiliary device for precise angle control in directional drilling for geological exploration, including a drill body 1 and a drill bit 5. A hole-reaming component 3 is provided inside the drill body 1 near the bottom end, and an adjustment chamber is provided at the bottom end of the drill body 1. An angle adjustment component 4 is provided inside the adjustment chamber. The hole reaming assembly 3 includes an annular base frame 13. The outer wall of the annular base frame 13 is detachably and fixedly connected to a hole reaming connecting rod 15 via a base frame bolt 14. The outer wall of the hole reaming connecting rod 15 is rotatably connected to a tool holder 17. The bottom end of the tool holder 17 is detachably and fixedly connected to a hole reaming tool 18 via a fastening bolt 20. The hole reaming assembly 3 also includes a vertical drive mechanism for driving the annular base frame 13 to move vertically.

[0022] The vertical drive mechanism includes a hydraulic rod 6, with a telescopic end 7 fixedly connected to the bottom end of the hydraulic rod 6. The bottom end of the telescopic end 7 is fixedly connected to the upper surface of the annular base frame 13 via a connecting flange 12. The housing of the hydraulic rod 6 is fixedly connected to the inner wall of the drill body 1 via an mounting ring.

[0023] A rigid bottom tube 8 is fixedly connected to the outer wall near the bottom of the hydraulic rod 6, and a rigid top tube 9 is fixedly connected to the top of the hydraulic rod 6. Both the top of the rigid bottom tube 8 and the rigid top tube 9 are rotatably connected to a rotary sealing joint 10.

[0024] The outer wall of the drill body 1 near the bottom is provided with a reaming groove 11 that is compatible with the tool holder 17. The top of the reaming cutter 18 is provided with a slot that is compatible with the tool holder 17. The bottom of the tool holder 17 is movably inserted into the inner wall of the slot through the insertion rod 19. One end of the fastening bolt 20 is threaded through the insertion rod 19.

[0025] The top of the tool holder 17 is provided with a rotating groove 21 that is adapted to the reaming connecting rod 15. The inner wall of the rotating groove 21 is movably connected to the outer wall of the reaming connecting rod 15. The top of the tool holder 17 is rotatably connected to the reaming connecting rod 15 through a pin 22.

[0026] The bottom end of the reaming connecting rod 15 is fixedly connected to a reinforcing bottom ring 16, and the upper surface of the annular base frame 13 is provided with a wire-passing groove. The outer wall of the drill body 1 near the top is fixedly connected to a transmission gear 2.

[0027] In this embodiment, the reamer 18 is detachably connected to the insert rod 19 via fastening bolts 20, and the reamer connecting rod 15 is fixed to the annular base 13 via base bolts 14. After wear, it can be replaced simply by removing the corresponding bolts, without disassembling the entire assembly, thus significantly improving maintenance efficiency. By replacing the reamer 18 and drill bit 5 with different specifications, and adjusting the stroke of the hydraulic rod 6 and the lever transmission ratio, it can adapt to exploration needs of different lithologies and target layer depths, and is compatible with various specifications of drill bit bodies 1, making it widely applicable.

[0028] Example 2, as Figure 1 - Figure 8 As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the angle adjustment component 4 includes a hinged ball seat 24 fixedly connected to the inner wall of the adjustment chamber, a rotating ball 25 rotatably connected to the inner wall of the hinged ball seat 24, the bottom end of the rotating ball 25 being fixedly connected to the center of the top end of the drill bit 5, and the top end of the rotating ball 25 being rotatably connected to an adjustment lever 30 via an angle rotating rod, and one end of the adjustment lever 30 being provided with a transverse drive mechanism for driving it to rotate.

[0029] The lateral drive mechanism includes an adjusting electromagnet 26. The outer wall of the adjusting electromagnet 26 is fixedly connected to the inner wall of the adjusting chamber via an electromagnet mounting bracket 27. An adjusting iron core 28 is movably inserted into the inner wall of the adjusting electromagnet 26. One end of the adjusting iron core 28 is rotatably connected to one end of the adjusting lever 30. The outer wall of the adjusting lever 30 near the top is rotatably connected to the inner wall of the adjusting chamber via a crossbar. An angle sensor 32 is fixedly connected to one end of the angle rotating rod.

[0030] A displacement sensor 31 is rotatably connected to the outer wall of the end of the adjusting lever 30 near the rotating ball 25. The tail end of the displacement sensor 31 is rotatably connected to the inner wall of the adjusting chamber through the rotating seat 33.

[0031] A return spring 29 is sleeved on one end of the adjusting iron core 28. One end of the return spring 29 is fixedly connected to one end of the adjusting electromagnet 26. An electromagnetic shielding shell is fixedly sleeved on the outer wall of the adjusting electromagnet 26.

[0032] The angle adjustment assembly 4 also includes a sealing plate 23, which is fixedly connected to the inner wall of the adjustment chamber, and the outer wall of the hinge ball seat 24 is fixedly connected to the inner wall of the adjustment chamber.

[0033] In this embodiment, the sealing plate 23 of the regulating chamber and the hinged ball seat 24 form a sealed cavity. Combined with the water-swellable sealant of the wiring groove and the protective design of the signal rotary connector, the drilling fluid seepage and wire entanglement problems are effectively prevented, ensuring the stable operation of the device in the complex downhole environment.

[0034] The two ends of the crossbar are fixed to the inner wall of the adjustment chamber through bushings. The adjustment lever 30 has a shaft hole near the top and is connected to the crossbar through a rolling bearing to reduce the rotational resistance of the lever.

[0035] Example 3, as Figure 1 - Figure 8 As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the drill body 1 can be integrally forged from high-strength alloy steel. The drill bit 5 can be made of cemented carbide, and the reamer 18 has the same material as the drill bit 5. The sensor output shaft is rigidly connected to the angle rotating rod via a coupling to ensure synchronous transmission of the rotation angle.

[0036] An arc-shaped clamp is installed on the inner wall of the mounting ring. A rubber anti-slip pad is installed between the clamp and the housing of the hydraulic rod 6. The clamp and the hydraulic rod 6 are fastened with bolts to achieve stable fixation of the hydraulic rod 6.

[0037] To meet the installation requirements of the wire, a sealed wiring groove can be opened along the axial direction on the inner wall of the drill body 1. The wiring groove extends from the top of the drill body 1 to the side wall of the adjustment chamber. The groove opening is sealed with a stainless steel cover plate, and an oil-resistant sealing ring is installed between the cover plate and the groove. All conductors are armored waterproof shielded cables with polytetrafluoroethylene insulation, suitable for harsh underground environments. At the connection between the transmission gear 2 and the drill body 1, a signal rotary connector is coaxially installed. The fixed end of the connector is fixed to the drilling platform by a bracket, and the rotating end is connected to the conductive slip ring at the top of the drill body 1. The main line is connected to the fixed end of the signal rotary connector, and the branch wires are led out from the rotating end and laid along the wiring groove to the adjusting electromagnet 26, the angle sensor 32 and the displacement sensor 31. The wire threading hole adopts a double sealing structure, with an inner rubber sealing sleeve and an outer layer filled with water-swellable sealant to ensure that drilling fluid does not seep in. A junction box is installed in the regulating chamber, and all branch wires are connected to the terminal blocks inside the junction box, which facilitates fault diagnosis and wire replacement. The junction box adopts a waterproof and explosion-proof design.

[0038] The working principle of the auxiliary device for precise angle control in directional drilling for geological exploration will be explained in detail below.

[0039] like Figure 1 - Figure 8As shown, before operation, the device assembly and debugging are completed: the transmission gear 2 near the top outer wall of the drill string body 1 is engaged with the output gear of the external servo motor, and the servo motor and the drill string body 1 are rigidly fixed through the flange structure; the external controller is electrically connected to the adjusting electromagnet 26 of the angle adjustment component 4, the angle sensor 32, the displacement sensor 31, and the hydraulic rod 6 of the reaming component 3, and the parameters are preset. The external servo motor is started, and the motor power is transmitted to the drill string body 1 through the transmission gear 2, driving the drill string body 1, the reaming component 3, the angle adjustment component 4, and the drill bit 5 to rotate synchronously, entering the drilling preparation state.

[0040] Angle adjustment process: When the drilling angle of drill bit 5 needs to be adjusted, the external controller sends a pulse adjustment signal to the adjusting electromagnet 26. After the adjusting electromagnet 26 is energized, it generates electromagnetic force, driving the adjusting iron core 28 inside to move laterally. During the movement of the adjusting iron core 28, the return spring 29 sleeved on its outer wall is compressed synchronously. The moving end of the adjusting iron core 28 pushes one end of the adjusting lever 30 to rotate around the crossbar at its top (the crossbar is fixedly connected to the inner wall of the adjusting chamber, forming a lever fulcrum). The other end of the adjusting lever 30 drives the rotating ball 25 to rotate in the hinged ball seat 24 through the angle rotating rod. Since the hinged ball seat 24 is fixed to the inner wall of the adjusting chamber, the rotating ball 25 can achieve 360° flexible deflection, thereby driving the drill bit 5 fixedly connected to its bottom end to deflect synchronously, completing the drilling angle adjustment.

[0041] During angle adjustment, the dual detection components simultaneously collect data and feed it back to the external controller: the angle sensor 32, fixedly connected to the angle lever, detects the rotation angle of the angle lever in real time and directly calculates the deflection angle of the drill bit 5; the displacement sensor 31, rotatably connected to the adjusting lever 30, indirectly obtains the deflection amplitude of the adjusting lever 30 by detecting the extension and retraction of its own extended end, assisting in calibrating the angle data of the drill bit 5. To further improve detection accuracy, an additional set of displacement sensors 31 can be added, connected to the moving end of the adjusting core 28, to directly detect the lateral movement distance of the adjusting core 28, forming a triple detection redundancy of "angle-dual displacement". All detection data, after being processed by the controller, can be displayed in real time through the multimedia panel for easy monitoring by operators.

[0042] Synchronous reaming process: Simultaneously with the operation of the angle adjustment component 4, the external controller sends a drive signal to the hydraulic rod 6. Upon activation, the hydraulic rod 6 pushes its bottom telescopic end 7 downwards. The telescopic end 7, via the connecting flange 12, drives the annular base frame 13 to move vertically along the inner wall of the drill bit body 1. The annular base frame 13 is fixedly connected to the reaming connecting rod 15 via base bolts 14. Therefore, the reaming connecting rod 15 moves downwards synchronously with the annular base frame 13, thereby pushing the tool holder 17, which is rotatably connected to its outer wall via pin 22, downwards. Since the outer wall of the drill bit body 1 near the bottom has a reaming groove 11 adapted to the tool holder 17, the tool holder 17, guided by the reaming groove 11 during downward movement, rotates outwards around the reaming connecting rod 15, causing the reaming cutter 18, fixed to the insertion rod 19 via fastening bolts 20, to synchronously ream the wellbore sidewall just drilled by the drill bit 5. The outward expansion angle of the reamer 18 is limited by the height of the inner wall of the reamer groove 11, and the outward expansion range is precisely controlled by the downward movement distance of the annular base frame 13, ensuring that the wellbore profile matches the deflection trajectory of the drill bit 5 after reaming.

[0043] Reset and Operation Termination: After the drill bit 5 reaches the preset deflection angle and completes drilling of the corresponding well section, the external controller stops supplying power to the adjusting electromagnet 26. The electromagnetic force of the adjusting electromagnet 26 disappears, the reset spring 29 releases its elastic potential energy, and pushes the adjusting iron core 28 to move in the opposite direction to reset. The adjusting lever 30 resets under the pull of the adjusting iron core 28, causing the rotating ball 25 and the drill bit 5 to return to their initial posture. At the same time, the hydraulic rod 6 drives the telescopic end 7 to retract upward, causing the annular base frame 13 and the reaming connecting rod 15 to move upward. The tool holder 17 retracts inward under its own weight and the guidance of the reaming groove 11, and the reaming cutter 18 retracts into the drill string body 1. If drilling needs to continue, the device remains in a rotating state; if the operation is terminated, the external servo motor is turned off, and the drill string body 1 stops rotating.

[0044] Sealing and wiring protection: The sealing plate 23 fixed to the inner wall of the adjustment chamber cooperates with the hinged ball seat 24 to form a sealed cavity, encapsulating all components of the angle adjustment assembly 4 inside, preventing drilling fluid from seeping in and causing component corrosion. The wiring installation adopts a dual protection design of "fixed wiring and rotary connection": the main wire of the external controller is laid along the pre-set sealed wiring groove on the inner wall of the drill body 1, and the wiring groove is filled with water-swellable sealant; a coaxial signal rotary joint is installed at the connection between the transmission gear 2 and the drill body 1, the main wire is connected to the fixed end of the signal rotary joint, and the rotating end of the signal rotary joint is connected to the adjustment electromagnet 26, angle sensor 32, and displacement sensor 31 respectively through branch wires; the hydraulic oil pipeline of the hydraulic rod 6 is connected to the hard top pipe 9 at its top end and the hard bottom pipe 8 at its bottom end, and a rotary sealing joint 10 is installed at the connection between the hard top pipe 9 and the hard bottom pipe 8 to achieve stable hydraulic oil delivery during rotation. This wiring and pipeline design completely avoids the problem of wire and pipeline entanglement and pulling when the drill body 1 rotates.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An auxiliary device for precise angle control in directional drilling for geological exploration, comprising a drill string body (1) and a drill bit (5), characterized in that: The drill body (1) is provided with a hole-reaming assembly (3) near the bottom end, and the bottom end of the drill body (1) is provided with an adjustment chamber, and the adjustment chamber is provided with an angle adjustment assembly (4). The hole-expanding assembly (3) includes an annular base frame (13), and a hole-expanding connecting rod (15) is detachably and fixedly connected to the outer wall of the annular base frame (13) by base frame bolts (14). A tool holder (17) is rotatably connected to the outer wall of the hole-expanding connecting rod (15). A hole-expanding knife (18) is detachably and fixedly connected to the bottom end of the tool holder (17) by fastening bolts (20). The hole-expanding assembly (3) also includes a vertical drive mechanism for driving the annular base frame (13) to move vertically. The angle adjustment assembly (4) includes a hinged ball seat (24) fixedly connected to the inner wall of the adjustment chamber. A rotating ball (25) is rotatably connected to the inner wall of the hinged ball seat (24). The bottom end of the rotating ball (25) is fixedly connected to the center of the top end of the drill bit (5). The top end of the rotating ball (25) is rotatably connected to an adjustment lever (30) via an angle rotating rod. One end of the adjustment lever (30) is provided with a transverse drive mechanism for driving it to rotate.

2. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The vertical drive mechanism includes a hydraulic rod (6), the bottom end of which is fixedly connected to a telescopic end (7). The bottom end of the telescopic end (7) is fixedly connected to the upper surface of the annular base frame (13) through a connecting flange (12). The housing of the hydraulic rod (6) is fixedly connected to the inner wall of the drill body (1) through an installation ring.

3. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The transverse drive mechanism includes an adjusting electromagnet (26), the outer wall of which is fixedly connected to the inner wall of the adjusting chamber via an electromagnet mounting bracket (27), an adjusting iron core (28) is movably inserted into the inner wall of the adjusting electromagnet (26), one end of the adjusting iron core (28) is rotatably connected to one end of the adjusting lever (30), the outer wall of the adjusting lever (30) near the top is rotatably connected to the inner wall of the adjusting chamber via a crossbar, and one end of the angle rotating rod is fixedly connected to an angle sensor (32).

4. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 2, characterized in that: The hydraulic rod (6) is fixedly connected to a rigid bottom tube (8) near the bottom end of the outer wall, and a rigid top tube (9) is fixedly connected to the top end of the hydraulic rod (6). The top ends of the rigid bottom tube (8) and the rigid top tube (9) are rotatably connected to a rotary sealing joint (10).

5. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The adjustment lever (30) is rotatably connected to the outer wall of the end near the rotating ball (25) by a displacement sensor (31), and the tail end of the displacement sensor (31) is rotatably connected to the inner wall of the adjustment chamber through a rotating seat (33).

6. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 3, characterized in that: One end of the adjusting core (28) is fitted with a return spring (29), one end of the return spring (29) is fixedly connected to one end of the adjusting electromagnet (26), and an electromagnetic shielding shell is fixedly fitted to the outer wall of the adjusting electromagnet (26).

7. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The angle adjustment assembly (4) also includes a sealing plate (23), which is fixedly connected to the inner wall of the adjustment chamber, and the outer wall of the hinge ball seat (24) is fixedly connected to the inner wall of the adjustment chamber.

8. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The outer wall of the drill body (1) near the bottom end is provided with a reaming groove (11) adapted to the tool holder (17). The top end of the reaming cutter (18) is provided with a slot adapted to the tool holder (17). The bottom end of the tool holder (17) is movably inserted into the inner wall of the slot through the insert rod (19). One end of the fastening bolt (20) is threaded through the insert rod (19).

9. The auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The top of the tool holder (17) is provided with a rotating groove (21) that is adapted to the reaming connecting rod (15). The inner wall of the rotating groove (21) is movably connected to the outer wall of the reaming connecting rod (15). The top of the tool holder (17) is rotatably connected to the reaming connecting rod (15) through a pin (22).

10. An auxiliary device for precise angle control in directional drilling for geological exploration according to claim 1, characterized in that: The bottom end of the reaming connecting rod (15) is fixedly connected to a reinforcing bottom ring (16), the upper surface of the annular base frame (13) is provided with a wire-passing groove, and the outer wall of the drill body (1) near the top is fixedly connected to a transmission gear (2).

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