A self-excited vibration coring drill for deep-sea carriers

Abstract

The present invention relates to the technical field of deep-sea geological core sampling, in particular to a self-excited vibration coring drill for a deep-sea carrier, comprising a driving member, providing torque, as a fixed end; a magnetic coupling, comprising an outer rotor and an inner rotor, both of which are nested and installed, the outer rotor has an outer rotor magnetic pole, the inner rotor has an inner rotor magnetic pole, and the outer rotor is connected to the driving member; an inner casing, one end of which is connected to the inner rotor, and the other end is connected to a drill bit, and the driving member torque is transmitted to the inner casing through the relatively arranged outer rotor magnetic pole and inner rotor magnetic pole, thereby driving the drill bit to rotate to achieve drilling and coring; the inner and outer rotors of the magnetic coupling rely on magnetic force to transmit torque, which is a flexible transmission. When the circumferential load on the drill bit changes continuously, the inner casing will continuously adjust the angle relative to the motor rotor to generate circumferential torsional vibration. The generated circumferential torsional vibration reduces the friction between the inner wall of the casing and the core, avoids deformation and even breakage of the core caused by excessive friction, and keeps the core intact.

Description

Technical Field

[0001] The invention relates to the technical field of deep-sea geological core sampling, in particular to a self-excited vibration coring drill tool for a deep-sea carrier. Background Art

[0002] Subsea drilling is an important means of marine geological exploration and is widely used in the fields of oil and gas resource exploration and exploitation, seabed mineral resource survey, etc. At present, there are two main drilling methods for deep-sea core sampling. The first is to sink the drilling rig to the seabed via a cable and remotely control it on a research vessel or drilling platform; the second is to use a deep-sea carrier to carry the drilling rig to the seabed to work. In the first method, the system structure of this type of drilling rig is complex and it is a large underwater equipment. The core samples obtained by this type of drilling rig are characterized by deep drilling, large diameter, and large number. They play an important role in the series of ocean drilling scientific programs, but the drilling accuracy is limited due to factors such as underwater positioning and large navigation errors.

[0003] The second method is to use a deep-sea carrier to carry a drilling rig to the seabed to work, which can effectively solve the problem of large underwater positioning and navigation errors in the first method, resulting in limited drilling accuracy. The drilling method based on the deep-sea carrier has unique advantages in flexibility and precision coring operations. However, the current deep-sea carrier coring drill casing does not provide sufficient protection for the core, and the coring success rate is low; at the same time, the current deep-sea carrier coring drill consumes a lot of energy, and it is difficult to achieve long-term, large-scale drilling and coring, whether it is an external power supply or relying on the submersible energy system. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a self-excited vibration coring drill for deep-sea carriers, which can realize that when the drilling load on the drill bit changes, the inner casing and the drill bit will generate longitudinal and torsional composite vibrations, which can reduce energy consumption and reduce the friction between the inner wall of the inner casing and the core to protect the integrity of the core. In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0005] A self-excited vibration coring drill for a deep-sea carrier, comprising:

[0006] The driving member provides torque and serves as the fixed end;

[0007] A magnetic coupling comprises an outer rotor and an inner rotor, which are nested and installed, wherein the outer rotor has an outer rotor magnetic pole, the inner rotor has an inner rotor magnetic pole, and the outer rotor is connected to the driving member;

[0008] The inner casing has one end connected to the inner rotor and the other end connected to a drill bit. The torque of the driving member is transmitted to the inner casing through the relatively arranged outer rotor poles and the inner rotor poles, thereby driving the drill bit to rotate to achieve core drilling.

[0009] As a further implementation method, it also includes a sleeve fixing seat, the front end of the driving member is connected to the first flange, and a reserved sleeve is provided at the front end of the first flange; the rear end of the sleeve fixing seat is connected to the reserved sleeve through a second flange, and an outer sleeve is connected near the middle position, and the outer sleeve is sleeved outside the inner sleeve; the sleeve fixing seat is nested on the outside of the outer rotor, and the rear end of the outer rotor extends into the reserved sleeve and is connected to the electronic rotor.

[0010] As a further implementation method, a fixing clamp ring is provided on the peripheral side of the inner sleeve near the rear end, and clamp ring magnets are respectively embedded on the front and rear side surfaces of the fixing clamp ring.

[0011] As a further implementation, a stepped sleeve is provided at the rear end of the outer sleeve, and the stepped sleeve is sleeved on a portion of the sleeve fixing seat and connected to the sleeve fixing seat.

[0012] As a further implementation method, the fixed clamping ring and the clamping ring magnets on its front and rear sides are all located in the step sleeve, an upper annular magnet is provided at the front end of the sleeve fixing seat, and the outer sleeve is provided with a step surface formed on the inner side of the step sleeve, and a lower annular magnet is provided on the step surface, and the upper annular magnet and the lower annular magnet are located on both sides of the fixed clamping ring; the clamping ring magnet on each side of the fixed clamping ring has the same magnetic pole as the annular magnet on the corresponding side.

[0013] As a further implementation, a third flange is provided on the outer side of the sleeve fixing seat near the middle position, and the step sleeve is connected to the sleeve fixing seat via the third flange.

[0014] As a further implementation, the outer surface of the inner sleeve is provided with a plurality of spiral grooves.

[0015] As a further implementation, the inner casing is in an inverted cone shape, and the inner diameter of one end of the inner casing close to the drill bit is smaller than the inner diameter of the other end.

[0016] As a further implementation, the second flange is used to connect to the deep-sea submersible via a mechanical arm or a mobile bracket.

[0017] As a further implementation, the driving member is a motor.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The inner and outer rotors of the magnetic coupling of the present invention transmit torque by magnetic force, which is a flexible transmission. The transmitted torque is related to the angle between the inner and outer rotors. When the load changes, the angle between the inner and outer rotors will change accordingly until the magnetic force and the load between the inner and outer rotors reach a balance. Therefore, when the circumferential load on the drill bit continues to change, the inner casing will continuously adjust its angle relative to the motor rotor, generating circumferential torsional vibration. The generated circumferential torsional vibration reduces the friction between the inner wall of the casing and the core, avoiding deformation or even breakage of the core caused by excessive friction, and keeping the core intact.

[0020] 2. In the present invention, since the inner casing and the drill bit are suspended and fixed by magnetic force, when the axial drilling load on the drill bit changes, the inner casing and the drill bit will produce axial self-excited vibration. The drill bit vibration can be used to reduce the drilling load and reduce the energy consumption of the motor without additional energy consumption, thereby reducing the overall energy consumption of the equipment and the requirement for downforce. At the same time, the outer surface of the inner casing is provided with spiral grooves, which can convert the axial vibration into a longitudinal-torsional composite motion, generate circumferential torsional vibration, enhance the circumferential torsional vibration of the inner casing caused by the magnetic coupling, and better protect the integrity of the core.

[0021] 3. The inner casing of the present invention is in an inverted cone shape. When the core moves upward, it will gradually separate from the inner wall of the casing, which can reduce the friction of the inner wall of the casing on the core. Combined with the circumferential torsional vibration of the inner casing during the working process, the deformation and even breakage of the core caused by excessive friction can be effectively avoided. The core has high protection, which is conducive to improving the success rate of coring.

[0022] 4. The front end of the flange of the present invention is fixedly connected to the outer casing through the casing fixing seat to form a fixed outer shell of the drilling tool, which protects the inner casing, reduces the influence of external water flow on the vibration mode of the inner casing, and improves the working stability of the drilling tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 Schematic diagram of the overall structure of the drilling tool in the embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of the explosion of the main structure of the drilling tool in the embodiment of the present invention.

[0026] Figure 3 It is a perspective view of the assembly relationship of the main structure of the drilling tool in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the shape of the inner sleeve in an embodiment of the present invention.

[0028] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0029] Among them: 1. Motor; 2. First flange; 2-1. Reserved casing; 3. Casing fixing seat; 4. Outer casing; 4-1. Step casing; 5. Inner casing; 5-1. Fixed clamping ring; 5-2. Clamping ring magnet; 5-3. Spiral groove; 6. Drill bit; 7. Upper annular magnet; 8. Outer rotor; 8-1. Outer rotor pole; 9. Inner rotor; 9-1. Inner rotor pole; 10. Lower annular magnet; 11. Second flange; 12. Third flange. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] In a typical embodiment of the present invention, reference is made to Figure 1 and Figure 2 As shown, a self-excited vibration coring drill for a deep-sea carrier includes a driving member, a magnetic coupling, an outer casing 4, an inner casing 5, an upper annular magnet 7, a lower annular magnet 10 and a drill bit 6.

[0032] In this embodiment, the drilling direction is set to the front, so the end of each component in the drilling tool facing the front is the front end, and the end facing the rear is the rear end. In this embodiment, the driving member is a motor 1. It can be understood that in some other embodiments, other driving members can also be used, not limited to the motor 1 in this embodiment.

[0033] A corresponding connecting structure is fixedly arranged on the motor 1, and the connecting structure is a first flange 2. The front end peripheral side of the motor 1 is fixedly connected to the first flange 2. The first flange 2 is used to connect to the deep-sea carrier through a mechanical arm or a mobile bracket, and is used to drive the entire coring drill to move and realize continuous drilling and coring.

[0034] The front end of the rotor of the motor 1 is connected to the magnetic coupling, the inner sleeve 5 and the drill bit 6 in sequence, wherein the first flange 2 and the rotor of the motor 1 do not interfere with each other.

[0035] The magnetic coupling includes an outer rotor 8 and an inner rotor 9. The front end of the rotor of the motor 1 is fixedly connected to the rear end of the outer rotor 8. The inner rotor 9 is nested inside the outer rotor 8. The front end of the inner rotor 9 is fixedly connected to the inner casing 5. The front end of the inner casing 5 is fixedly connected to the drill bit 6 to form the main body of the drilling tool.

[0036] The outer rotor 8 and the inner rotor 9 together form a magnetic coupling, which transmits the torque of the motor 1 to the inner casing 5 through the relatively arranged outer rotor poles 8-1 and inner rotor poles 9-1, thereby driving the drill bit 6 to rotate at high speed to achieve drilling and coring.

[0037] The inner and outer rotors of the magnetic coupling of this embodiment rely on magnetic force to transmit torque, which is a flexible transmission. The transmitted torque is related to the angle between the inner and outer rotors. When the load changes, the angle between the inner and outer rotors will change accordingly until the magnetic force and the load between the inner and outer rotors reach a balance. Therefore, when the circumferential load on the drill bit 6 continues to change, the inner casing 5 will continuously adjust the angle relative to the rotor of the motor 1, generating circumferential torsional vibration. The generated circumferential torsional vibration reduces the friction between the inner wall of the inner casing 5 and the core, avoiding deformation or even breakage of the core caused by excessive friction, and keeping the core intact.

[0038] The front end of the first flange 2 is fixedly connected to the outer casing 4 through the casing fixing seat 3. Specifically, the casing fixing seat 3 is connected to the outer casing 4 near the middle position to form a fixed outer shell of the drilling tool. The outer casing 4 is sleeved outside the inner casing 5 to protect the inner casing 5, reduce the influence of external water flow on the vibration mode of the inner casing 5, and improve the working stability of the drilling tool.

[0039] like Figure 3 As shown, the rear end of the sleeve fixing seat 3 is provided with a second flange 11, the front end of the first flange 2 is provided with a reserved sleeve 2-1, and the first flange 2 is fixedly connected to the second flange 11 provided at the rear end of the sleeve fixing seat 3 through the reserved sleeve 2-1. The reserved sleeve 2-1 and the first flange 2 are an integrated structure.

[0040] Specifically, the sleeve fixing seat 3 is a sleeve structure, and a third flange 12 is provided on the outer side of the sleeve fixing seat 3 near the middle position, and a step sleeve 4-1 is provided at the rear end of the outer sleeve 4. The inner diameter of the step sleeve 4-1 is larger than the outer diameter of the sleeve of the sleeve fixing seat 3, and is also larger than the inner diameter of the remaining sleeve of the outer sleeve 4. When connected, the step sleeve 4-1 is sleeved on part of the sleeve fixing seat 3, and the rear end of the step sleeve 4-1 is connected to the third flange 12.

[0041] like Figure 2 and Figure 3 As shown, the sleeve fixing seat 3 is nested on the outside of the outer rotor 8, and the rear end of the outer rotor 8 extends out of the rear end of the sleeve fixing seat 3, and extends into the reserved sleeve 2-1 and connects to the rotor of the motor 1, so that the rotor of the motor 1 drives the outer rotor 8 to move.

[0042] The outer sleeve 4 is provided with a step. The inner side of the sleeve 4 - 1 forms a step surface, and a lower end annular magnet 10 is embedded in the step surface.

[0043] like Figure 2 and Figure 3 As shown, a fixed clamp ring 5-1 is arranged on the peripheral side of the inner sleeve 5 near the rear end, and a circle of clamp ring magnets 5-2 are respectively embedded and fixed on the front and rear sides of the fixed clamp ring 5-1, and the fixed clamp ring 5-1 and the clamp ring magnets 5-2 on the front and rear sides are all located in the step sleeve 4-1. The clamp ring magnet 5-2 located on the rear side of the fixed clamp ring 5-1 is arranged opposite to the upper end annular magnet 7 embedded in the front end of the sleeve fixing seat 3 and has the same magnetic pole. The clamp ring magnet 5-2 located on the front side of the fixed clamp ring 5-1 is arranged opposite to the lower end annular magnet 10 and has the same magnetic pole.

[0044] like Figure 3 As shown, after the drilling tool is installed, the fixed clamp ring 5-1 is located between the upper annular magnet 7 and the lower annular magnet 10, and the three do not touch each other. By setting the same magnetic poles on the magnets on the corresponding sides, the upper annular magnet 7 and the lower annular magnet 10 can simultaneously apply repulsive force to the fixed clamp ring 5-1, so that the fixed clamp ring 5-1 together with the inner casing 5 and the drill bit 6 can achieve axial floating fixation.

[0045] Since the inner casing 5 and the drill bit 6 can be suspended and fixed as a whole by magnetic force, when the axial drilling load on the drill bit 6 changes, the inner casing 5 and the drill bit 6 will produce axial self-excited vibration. The drill bit vibration can be used to reduce the drilling load and the energy consumption of the motor 1 without consuming additional energy, thereby reducing the overall energy consumption of the equipment and the requirements for downforce.

[0046] like Figure 2 , Figure 3 and Figure 4 As shown, the outer surface of the inner casing 5 is also provided with a plurality of spiral grooves 5-3, and a plurality of groups of spiral grooves 5-3 are arranged along the length direction of the outer surface of the inner casing 5, and each group is arranged along the circumference of the outer surface, which can produce a longitudinal-torsional mode conversion effect, thereby realizing the conversion of the axial vibration of the inner casing 5 into a longitudinal-torsional composite vibration, and coupling with the torsional vibration of the inner casing 5 caused by the magnetic coupling, thereby further reducing the friction between the inner wall of the inner casing 5 and the core, and protecting the integrity of the core.

[0047] like Figure 4 As shown, the inner casing 5 is in an inverted cone shape, that is, the front end is small and the rear end is large, and the taper range is set to 0.2°~2° according to the length of the casing, and the taper in this embodiment is 0.5°. By setting the inner casing 5 in an inverted cone shape, the core will gradually separate from the inner wall of the inner casing 5 when moving upward, which can reduce the friction of the inner wall of the inner casing 5 on the core.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-excited vibration coring drill for deep-sea carriers, characterized in that: include: The driving member provides torque and serves as the fixed end; A magnetic coupling comprises an outer rotor and an inner rotor, which are nested and installed, wherein the outer rotor has an outer rotor magnetic pole, the inner rotor has an inner rotor magnetic pole, and the outer rotor is connected to the driving member; An inner casing, one end of which is connected to the inner rotor, and the other end of which is connected to a drill bit, wherein the torque of the driving member is transmitted to the inner casing through the relatively arranged outer rotor magnetic poles and the inner rotor magnetic poles, thereby driving the drill bit to rotate to achieve drilling and coring; It also includes a sleeve fixing seat, the front end of the driving member is connected to the first flange, and the front end of the first flange is provided with a reserved sleeve; the rear end of the sleeve fixing seat is connected to the reserved sleeve through a second flange, and an outer sleeve is connected near the middle position, and the outer sleeve is sleeved outside the inner sleeve; A fixing clamp ring is provided on the peripheral side of the inner sleeve near the rear end, and clamp ring magnets are respectively embedded on the front and rear sides of the fixing clamp ring; The rear end of the outer sleeve is provided with a stepped sleeve, and the stepped sleeve is sleeved on part of the sleeve fixing seat and connected to the sleeve fixing seat; The fixed clamping ring and the clamping ring magnets on its front and rear sides are all located in the step sleeve, an upper annular magnet is provided at the front end of the sleeve fixing seat, and the outer sleeve is provided with a step surface formed on the inner side of the step sleeve, and a lower annular magnet is provided on the step surface. The upper annular magnet and the lower annular magnet are located on both sides of the fixed clamping ring; the clamping ring magnet on each side of the fixed clamping ring has the same magnetic pole as the annular magnet on the corresponding side.

2. The self-excited vibration coring drill for deep-sea carrier according to claim 1, characterized in that: The sleeve fixing seat is nested on the outside of the outer rotor, and the rear end of the outer rotor extends into the reserved sleeve and is connected to the electronic rotor.

3. The self-excited vibration coring drill for deep-sea carrier according to claim 1, characterized in that: A third flange is provided on the outer side of the sleeve fixing seat near the middle position, and the step sleeve is connected to the sleeve fixing seat via the third flange.

4. The self-excited vibration coring drill for deep-sea carrier according to claim 1, characterized in that: The outer surface of the inner sleeve is provided with a plurality of spiral grooves.

5. The self-excited vibration coring drill for deep-sea carrier according to claim 1, characterized in that: The inner casing is in an inverted cone shape, and the inner diameter of one end of the inner casing close to the drill bit is smaller than the inner diameter of the other end.

6. The self-excited vibration coring drill for deep-sea carrier according to claim 1, characterized in that: The second flange is used to be connected to the deep-sea submersible through a mechanical arm or a mobile bracket.

7. The self-excited vibration coring drill for deep-sea carrier according to claim 1, characterized in that: The driving member is a motor.

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