Underground electric drive high-frequency rotary impact sampler with measurement and control function

Abstract

The invention belongs to the technical field of drilling engineering underground power tools, and particularly relates to an underground electric-driven high-frequency rotary impact sampler with a measurement and control function, which comprises an upper joint, a motor outer pipe, an impact outer pipe, a lower cylinder and a sampling short section, a driving motor is mounted in the motor outer pipe, a mandrel and an impact hammer are mounted in the impact outer pipe, a concave plate is fixedly mounted on the mandrel, and the concave plate is fixedly mounted on the lower cylinder. A concave plate is arranged in the lower cylinder, a plurality of spherical grooves are formed in one side of the concave plate, a plurality of convex balls are installed at the end, close to the concave plate, of the impact hammer, a spring connected with the impact hammer is arranged in the impact outer pipe, and a cutting board is arranged in the lower cylinder. The device is simple in structure, small in energy loss and accurate in control, is provided with a mechanical self-oscillation cavity and other structures, is not internally provided with complex moving parts, can reduce the abrasion of parts, prolongs the service life, and has the characteristics of high adaptability, small interference to a drilling system, high controllability and intelligence.

Description

Technical Field

[0001] This invention belongs to the field of downhole power tools technology in drilling engineering, and particularly relates to a downhole electrically driven high-frequency rotary impact sampler with measurement and control functions. Background Technology

[0002] As drilling continues to penetrate deeper into the Earth, the difficulty of drilling footage in hard rock is becoming increasingly apparent. Impact rotary drilling is more efficient than conventional rotary drilling in breaking hard rock and is one of the effective methods to solve the drilling problems in hard rock formations.

[0003] The process of achieving rotary percussion drilling involves adding a percussion sampler with a specific impact frequency and energy to a rotary drilling tool. Rotary percussion samplers offer high rock-breaking efficiency and are suitable for complex formations: by utilizing the combined effect of high-frequency impact and rotation, they leverage the low shear strength and weak impact resistance of rocks to create numerous and continuously expanding cracks on the rock surface, significantly reducing the rock's destructive strength. Their impact frequency is typically higher than 40Hz, and when paired with diamond drill bits, they can significantly improve the rate of penetration in hard, fractured, and complex formations with varying hardness. They can be broadly categorized into hydraulic percussion samplers, pneumatic percussion samplers, and electric percussion samplers. Traditional hydraulic and pneumatic percussion samplers, due to their complex structure, high requirements for drilling fluids, and sensitivity to temperature and pressure, are difficult to apply effectively in deep hard rock drilling.

[0004] This invention designs an electric high-frequency rotary impact sampler with measurement and control functions for downhole operation to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, the present invention employs the following technical solutions: A downhole electrically driven high-frequency rotary impact sampler with measurement and control function includes an upper connector, a motor outer tube, an impact outer tube, a lower cylinder, and a sampling section. The upper connector is installed at one end of the motor outer tube, and the other end of the motor outer tube is connected to the impact outer tube. The lower cylinder is connected to the impact outer tube. A drive motor is installed inside the motor outer tube. A mandrel and a hammer are installed inside the impact outer tube. The mandrel is rotatably connected to the impact outer tube. A first bushing is sleeved in the middle of the mandrel. The hammer is rotatably mounted on the mandrel through the first bushing and is slidably connected to the impact outer tube. The drive motor is poweredly connected to one end of the mandrel. A concave plate is fixedly installed on the mandrel. Several spherical grooves are provided on one side of the concave plate. Several convex spheres are installed at the end of the hammer near the concave plate. A spring connected to the hammer is installed inside the impact outer tube. An anvil is installed inside the lower cylinder. The other end of the mandrel passes through the hammer and is poweredly connected to the anvil. One end of the sampling section extends into the lower cylinder and is connected to the anvil.

[0006] As a preferred embodiment, a second bushing is installed inside the impact outer tube. One end of the second bushing abuts against the lower cylinder. The impact hammer is slidably connected to the impact outer tube through the second bushing. A spring surrounds the outside of the impact hammer, with one end of the spring connected to the impact hammer and the other end of the spring connected to the second bushing.

[0007] As a preferred embodiment, a copper ring is installed at one end of the anvil near the punch, a gear groove is opened in the middle of the anvil, and the other end of the spindle extends into the gear groove and is equipped with a gear that meshes with the gear groove.

[0008] As a preferred embodiment, a third bushing is installed inside the lower cylinder, and the sampling short section is connected to the lower cylinder through the third bushing. The sampling short section is threadedly connected to the anvil, and a steel ball that contacts the outer surface of the lower cylinder is fixed on the sampling short section.

[0009] As a preferred embodiment, a motor mounting bracket and a reducer mounting plate are installed inside the outer tube of the motor. The drive motor is mounted on the motor mounting bracket, and a reducer is mounted on the reducer mounting plate. One end of the reducer is connected to the drive motor, and the other end of the reducer is connected to one end of the spindle.

[0010] As a preferred embodiment, a sealing cap is installed between the upper connector and the outer tube of the motor, with both ends of the sealing cap extending into the upper connector and the outer tube of the motor, respectively.

[0011] As a preferred embodiment, a motor sensor is installed on the drive motor, a speed sensor facing the spindle is installed inside the outer tube of the motor, a wire through hole is opened on the sealing cover, and an electrical and watertight plug for sealing the wire through hole is provided on the sealing cover. The speed sensor, the motor sensor and the drive motor are connected to the outside through the wires of the electrical and watertight plug.

[0012] As a preferred embodiment, the sealing cap has an oil filling hole, the lower cylinder has an oil draining hole, the motor outer tube and the impact outer tube are filled with insulating liquid, the outer end of the sealing cap is provided with a first plug for sealing the oil filling hole, and the outer end of the lower cylinder is provided with a second plug for sealing the oil draining hole.

[0013] As a preferred option, the sealing cover is threaded to the upper connector, and a pin is installed between the motor outer tube and the sealing cover.

[0014] Compared with existing technologies, the advantages of this invention are: 1. The mandrel designed in this invention can drive the concave plate and the anvil to rotate at high speed. The rotating concave plate is used to cooperate with the convex ball on the hammer. The groove and the convex ball are constantly engaged and disengaged, and the spring returns them to their original position, which can generate high-speed displacement pulses. This causes the hammer to generate displacement pulses, and the hammer continuously strikes the anvil, causing the anvil to drive the sampling sub to generate high-frequency impact. The rotating anvil enables the sampling sub to have the function of rotary drilling, ultimately achieving the purpose of drilling in deep hard rock.

[0015] 2. By adjusting the number of spherical grooves on the concave plate, this invention can achieve impact effects of hammers at different frequencies; by adjusting the structural design of the grooves and the convex spheres, such as the volume of the convex spheres, the magnitude of the hammer impact displacement can be adjusted, thereby optimizing various impact forces.

[0016] 3. The electro-mechanical rotary impact sampler designed in this invention is completely independent of drilling fluid. It features a diverse and highly adaptable structural design, employs a direct-drive motor, resulting in low energy loss and precise control. Its mechanical self-excited oscillation chamber and other structures eliminate complex moving parts, reducing component wear and extending service life. Compared to hydraulic and pneumatic impact samplers, it offers greater adaptability, less interference with the drilling system, higher controllability, and greater intelligence, overcoming the problems inherent in hydraulic and pneumatic impact samplers during operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the hammer in the retracted state of the present invention.

[0019] Figure 3 This is a schematic diagram of the hammering state of the present invention.

[0020] Figure 4 This is a schematic diagram showing the positional relationship between the mandrel, punch, and anvil of the present invention.

[0021] Figure 5 This is a schematic diagram of the impact hammer of the present invention.

[0022] Figure 6 This is a schematic diagram of the concave plate of the present invention.

[0023] Figure 7 This is a cross-sectional schematic diagram of the outer tube of the motor of the present invention.

[0024] Labels in the diagram: 1. Upper connector; 2. Motor outer tube; 3. Impact outer tube; 4. Lower cylinder; 5. Sampling short section; 6. Drive motor; 7. Mandrel; 8. Punch hammer; 9. First bushing; 10. Concave plate; 11. Spherical groove; 12. Convex sphere; 13. Spring; 14. Anvil; 15. Second bushing; 16. Copper ring; 17. Gear groove; 18. Gear; 19. Third bushing; 20. Steel ball; 21. Motor mounting bracket; 22. Reducer mounting plate; 23. Sealing cover; 24. Motor sensor; 25. Speed ​​sensor; 26. Wire through hole; 27. Electrical and watertight plug; 28. Oil filling through hole; 29. ​​Oil drain through hole; 30. First plug; 31. Second plug; 32. Pin; 33. Reducer. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following embodiments and drawings are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0026] A downhole electrically driven high-frequency rotary impact sampler with measurement and control functions, such as... Figures 1 to 7 As shown, the device includes an upper connector 1, a motor outer tube 2, an impact outer tube 3, a lower cylinder 4, and a sampling section 5. The upper connector 1 is installed at one end of the motor outer tube 2, and the other end of the motor outer tube 2 is connected to the impact outer tube 3. The lower cylinder 4 is connected to the impact outer tube 3. A drive motor 6 is installed inside the motor outer tube 2. A spindle 7 and a hammer 8 are installed inside the impact outer tube 3. The spindle 7 is rotatably connected to the impact outer tube 3. A first bushing 9 is sleeved in the middle of the spindle 7. The hammer 8 is rotatably mounted on the spindle 7 through the first bushing 9. 8 is slidably connected to the impact outer tube 3, the drive motor 6 is poweredly connected to one end of the spindle 7, a concave plate 10 is fixedly installed on the spindle 7, a number of spherical grooves 11 are provided on one side of the concave plate 10, a number of convex spheres 12 are installed on one end of the impact hammer 8 near the concave plate 10, a spring 13 connected to the impact hammer 8 is provided inside the impact outer tube 3, an anvil 14 is provided inside the lower cylinder 4, the other end of the spindle 7 passes through the impact hammer 8 and is poweredly connected to the anvil 14, and one end of the sampling short section 5 extends into the lower cylinder 4 and is connected to the anvil 14.

[0027] The spindle 7 can drive the concave plate 10 and the anvil plate 14 to rotate at high speed. The rotating concave plate 10 is used to cooperate with the convex ball 12 on the hammer 8. The groove and the convex ball 12 are constantly engaged and disengaged, and the spring 13 resets them, which can generate high-speed displacement pulses. This causes the hammer 8 to form displacement pulses, and the hammer 8 continuously hammers the anvil plate 14, causing the anvil plate 14 to drive the sampling sub 5 to form high-frequency impacts. The rotating anvil plate 14 enables the sampling sub 5 to have the function of rotary drilling, ultimately achieving the purpose of drilling in deep hard rock.

[0028] The punch 8 is mounted on the outside of the spindle 7 via the first bushing 9. The punch 8 can move freely along the axial direction of the spindle 7, and the punch 8 will not rotate with the movement of the spindle 7. The spring 13 is used to realize the reset function of the punch 8 in the displacement pulse.

[0029] By adjusting the number of spherical grooves 11 on the concave plate 10, the impact effect of the hammer 8 at different frequencies can be achieved; by adjusting the structural design of the grooves and the convex spheres 12, such as the volume of the convex spheres 12, the magnitude of the impact displacement of the hammer 8 can be adjusted, thereby optimizing various impact forces.

[0030] With the cooperation of the mandrel 7, the hammer 8, and the anvil 14, the sampling section 5 is directly driven by a motor, so that the sampling section 5 moves in an impact and rotation manner to solve the drilling problem in hard rock formations and effectively reduce energy loss. In addition, compared with traditional hydraulic and pneumatic rotary impact samplers, this tool has a simple structure, is easy to operate, does not depend on drilling fluid, is not sensitive to downhole temperature and pressure, and has a wide range of applications.

[0031] The electro-mechanical rotary impact sampler is completely independent of drilling fluid, features a versatile and adaptable design, employs a direct-drive motor for low energy loss and precise control, and incorporates a mechanical self-excited oscillation chamber and other structural elements. The absence of complex moving parts reduces component wear and extends service life. Compared to hydraulic and pneumatic impact samplers, it offers greater adaptability, less interference with the drilling system, higher controllability, and greater intelligence. It overcomes the problems inherent in hydraulic and pneumatic impact samplers and shows promising application prospects in directional drilling and deep hard rock drilling.

[0032] like Figures 2 to 4 As shown, a second bushing 15 is installed inside the impact outer tube 3. One end of the second bushing 15 abuts against the lower cylinder 4. The impact hammer 8 is slidably connected to the impact outer tube 3 through the second bushing 15. The spring 13 is wrapped around the outside of the impact hammer 8. One end of the spring 13 is connected to the impact hammer 8, and the other end of the spring 13 is connected to the second bushing 15.

[0033] The second bushing 15 works in conjunction with the first bushing 9 to allow the punch 8 to move freely along the axial direction of the spindle 7 while being stably installed inside the impact outer tube 3. This also helps to stabilize the installation of the spindle 7.

[0034] A copper ring 16 is installed at one end of the anvil 14 near the punch 8. A gear groove 17 is opened in the middle of the anvil 14. The other end of the spindle 7 extends into the gear groove 17 and is equipped with a gear 18 that meshes with the gear groove 17.

[0035] The spindle 7 is connected to the gear 18 and the gear groove 17. The gear 18 can slide relative to the gear groove 17 along the axial direction of the anvil 14. Therefore, the connection between the gear 18 and the gear groove 17 will not hinder the movement of the anvil 14 relative to the spindle 7, thus driving the anvil 14 to rotate. The copper ring 16 is used to withstand the hammer blows of the hammer 8 and prevent the anvil 14 from being damaged by the hammer blows of the hammer 8.

[0036] A third bushing 19 is installed inside the lower cylinder 4. The sampling short section 5 is connected to the lower cylinder 4 through the third bushing 19. The sampling short section 5 is threadedly connected to the anvil 14. A steel ball 20 that contacts the outer surface of the lower cylinder 4 is fixed on the sampling short section 5.

[0037] The third bushing 19 is used to limit the movement trajectory of the sampling short section 5 and ensure that the sampling short section 5 does not collide with the lower cylinder 4 during movement. The end of the sampling short section 5 extending to the outside of the lower cylinder 4 is used for threaded connection with other tools, and the end contacts the outer wall of the lower cylinder 4 with a steel ball 20. This not only alleviates the friction between the sampling short section 5 and the lower cylinder 4, but also alleviates structural damage caused by collision.

[0038] like Figure 7 As shown, a motor mounting bracket 21 and a reducer mounting plate 22 are installed inside the outer tube 2 of the motor. The drive motor 6 is mounted on the motor mounting bracket 21, and a reducer 33 is mounted on the reducer mounting plate 22. One end of the reducer 33 is connected to the drive motor 6, and the other end of the reducer 33 is connected to one end of the spindle 7.

[0039] By adjusting the transmission ratio of the reducer 33, the impact effect of the hammer 8 at different frequencies can also be achieved.

[0040] A sealing cover 23 is installed between the upper connector 1 and the outer tube 2 of the motor. The two ends of the sealing cover 23 extend into the upper connector 1 and the outer tube 2 of the motor, respectively. The sealing cover 23 is threadedly connected to the upper connector 1. A pin 32 is installed between the outer tube 2 of the motor and the sealing cover 23.

[0041] The sealing cover 23 is used to protect the drive motor 6, spindle 7, punch 8 and other structures. The pin 32 is used to fix the sealing cover 23 inside the motor outer tube 2 to prevent the sealing cover 23 from twisting during equipment operation.

[0042] A motor sensor 24 is installed on the drive motor 6, and a speed sensor 25 facing the spindle 7 is installed inside the motor outer tube 2. A wire through hole 26 is opened on the sealing cover 23, and an electrical and watertight plug 27 for sealing the wire through hole 26 is provided on the sealing cover 23. The speed sensor 25, the motor sensor 24 and the drive motor 6 are connected to the outside through the wires of the electrical and watertight plug 27.

[0043] By using motor sensor 24 and speed sensor 25 to monitor the performance parameters of the motor, such as current, voltage, and spindle speed 7, the motor speed can be adjusted according to different working conditions, thereby achieving precise control of impact frequency and speed, and improving the flexibility and adaptability of drilling.

[0044] like Figure 3 and Figure 7 As shown, the sealing cap 23 has an oil filling hole 28, and the lower cylinder 4 has an oil draining hole 29. The motor outer tube 2 and the impact outer tube 3 are filled with insulating liquid. The outer end of the sealing cap 23 is provided with a first plug 30 for sealing the oil filling hole 28, and the outer end of the lower cylinder 4 is provided with a second plug 31 for sealing the oil draining hole 29.

[0045] The outer tube 2 of the motor and the outer tube 3 of the impact are filled with an insulating liquid, which is used for heat dissipation and lubrication. The concave plate 10 also has through holes for liquid flow.

[0046] Working principle: Driven by an external energy source, the drive motor 6 rotates the spindle 7 via the reducer 33. The spindle 7 drives the concave plate 10, the anvil 14, and the sampling section 5 to rotate at high speed. The convex ball 12 fixed on the hammer 8 contacts the spherical groove 11 of the concave plate 10. The groove and the convex ball 12 continuously engage and disengage, and are reset by the spring 13. When the concave plate 10 rotates at high speed, it generates high-speed displacement pulses with the convex ball 12, which drive the hammer 8 to strike the anvil 14, forming a high-frequency impact.

[0047] Depending on the working conditions, the motor speed can be adjusted in real time to achieve precise control of the impact frequency and speed of the sampling section 5; by adjusting the structural design of the groove and the convex ball 12, the magnitude of the impact displacement of the hammer 8 can be changed to achieve optimization of various impact forces.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function, characterized in that, The system includes an upper connector (1), a motor outer tube (2), an impact outer tube (3), a lower cylinder (4), and a sampling section (5). The upper connector (1) is installed at one end of the motor outer tube (2), and the other end of the motor outer tube (2) is connected to the impact outer tube (3). The lower cylinder (4) is connected to the impact outer tube (3). A drive motor (6) is installed inside the motor outer tube (2). A spindle (7) and a hammer (8) are installed inside the impact outer tube (3). The spindle (7) is rotatably connected to the impact outer tube (3). A first bushing (9) is sleeved in the middle of the spindle (7). The hammer (8) is rotatably mounted on the spindle (7) through the first bushing (9). 8) It is slidably connected to the impact outer tube (3), the drive motor (6) is powered to one end of the spindle (7), a concave plate (10) is fixedly installed on the spindle (7), a number of spherical grooves (11) are provided on one side of the concave plate (10), a number of convex spheres (12) are installed on one end of the impact hammer (8) near the concave plate (10), a spring (13) connected to the impact hammer (8) is provided in the impact outer tube (3), an anvil (14) is provided in the lower cylinder (4), the other end of the spindle (7) passes through the impact hammer (8) and is powered to the anvil (14), and one end of the sampling short section (5) extends into the lower cylinder (4) and is connected to the anvil (14).

2. The downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 1, characterized in that: The impact outer tube (3) is equipped with a second bushing (15). One end of the second bushing (15) abuts against the lower cylinder (4). The impact hammer (8) is slidably connected to the impact outer tube (3) through the second bushing (15). The spring (13) surrounds the outside of the impact hammer (8). One end of the spring (13) is connected to the impact hammer (8), and the other end of the spring (13) is connected to the second bushing (15).

3. The downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 1, characterized in that: The anvil (14) has a copper ring (16) installed at one end near the hammer (8), and a gear groove (17) is opened in the middle of the anvil (14). The other end of the spindle (7) extends into the gear groove (17) and is equipped with a gear (18) that meshes with the gear groove (17).

4. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 1 or 3, characterized in that: The lower cylinder (4) is equipped with a third bushing (19), and the sampling short section (5) is connected to the lower cylinder (4) through the third bushing (19). The sampling short section (5) is threadedly connected to the anvil (14), and a steel ball (20) that contacts the outer surface of the lower cylinder (4) is fixed on the sampling short section (5).

5. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 1, characterized in that: The motor outer tube (2) is equipped with a motor mounting bracket (21) and a reducer mounting plate (22). The drive motor (6) is mounted on the motor mounting bracket (21), and a reducer (33) is mounted on the reducer mounting plate (22). One end of the reducer (33) is connected to the drive motor (6), and the other end of the reducer (33) is connected to one end of the spindle (7).

6. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 5, characterized in that: A sealing cap (23) is installed between the upper connector (1) and the motor outer tube (2), with both ends of the sealing cap (23) extending into the upper connector (1) and the motor outer tube (2) respectively.

7. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 6, characterized in that: A motor sensor (24) is installed on the drive motor (6), and a speed sensor (25) facing the spindle (7) is installed inside the motor outer tube (2). A wire through hole (26) is opened on the sealing cover (23), and an electrical watertight plug (27) for sealing the wire through hole (26) is provided on the sealing cover (23). The speed sensor (25), the motor sensor (24) and the drive motor (6) are connected to the outside through the wire of the electrical watertight plug (27).

8. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 6 or 7, characterized in that: The sealing cap (23) has an oil filling hole (28) and the lower cylinder (4) has an oil drain hole (29). The motor outer tube (2) and the impact outer tube (3) are filled with insulating liquid. The outer end of the sealing cap (23) is provided with a first plug (30) for sealing the oil filling hole (28) and the outer end of the lower cylinder (4) is provided with a second plug (31) for sealing the oil drain hole (29).

9. A downhole electrically driven high-frequency rotary impact sampler with measurement and control function according to claim 6, characterized in that: The sealing cover (23) is threadedly connected to the upper connector (1), and a pin (32) is installed between the motor outer tube (2) and the sealing cover (23).

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