Vibration-reducing and torque-increasing drilling mechanism for underground drill string

Abstract

The invention discloses a vibration reduction and torque increase well drilling mechanism for an underground drill column. The vibration reduction and torque increase well drilling mechanism comprises a shell. The upper connector and the lower connector are fixedly connected to the two ends of the shell, the bottom of the upper connector is in threaded connection with an upper plug, and the end, connected with the shell, of the lower connector is connected with an impact seat; and one end of the vibration-reducing and torque-increasing device is connected with the upper plug, and the other end of the vibration-reducing and torque-increasing device extends into the percussion seat and is used for converting the axial relative vibration of the drill column into repeated torsion motion. According to the drilling mechanism, drill column vibration reduction and torsional impact rock breaking are combined, axial vibration of a drill column in the drilling process is converted into torsional impact, the rock breaking torque of a drill bit is increased, the rock breaking efficiency is improved, a drilling tool combination is protected, the drilling mechanism is simple in structure, existing drilling technologies and equipment are not changed, and normal circulation and drilling operation are not affected.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas drilling, and particularly relates to a downhole drill string vibration reduction and torque increase drilling mechanism. Background Technique

[0002] With the increase of the drilling depth, the hardness and plasticity of the rock increase, the drillability becomes poor, the mechanical drilling speed decreases, and the torque of the drill bit is often insufficient to break the rock, resulting in the instantaneous stop of the drill bit rotation. When the torque accumulates to a certain value, it will be released, applying a much higher impact load on the drill bit than usual. This phenomenon will lead to the reduction of the mechanical drilling speed, premature failure of the drill bit, and shortening of the service life of the lower drill string.

[0003] Practice shows that the previous simple axial impact drilling technology cannot effectively solve the problem of insufficient drill bit torque, and even exacerbate the stick-slip vibration phenomenon. Applying a certain frequency of torsional impact to the drill bit during the drilling process can effectively solve the problem of insufficient rock-breaking torque, thereby improving the mechanical rock-breaking efficiency, weakening the stick-slip vibration of the drill bit, and extending the service life of the bottom drill string.

[0004] In current rotary impact drilling tools, a rotary impact drill assembly provided by the Torkbuster rotary impactor patent publication number US6742609B2 in the United States uses a turbine to drive an impact hammer to generate high-frequency torsional impacts. Also, a rotary impact drilling tool provided by the patent publication number 200910058083.9 of Southwest Petroleum University consists of a housing, a screw motor stator, a screw motor rotor, a universal shaft, a transmission shaft, a cavity carrier, a sliding impactor, and a near-bit drill string sub. The housing and the near-bit drill string sub are connected by splines and positioned by a shaft shoulder. The screw motor rotor and the screw motor stator cooperate to form a screw motor, and the screw motor rotor is connected to the universal shaft by threads. The universal shaft is hollow and is connected to the eccentric hole of the transmission shaft through needle roller bearings and thrust ball bearings. Four diversion holes and one drainage hole are arranged on the transmission shaft. The central hole of the screw motor rotor, the central hole of the universal shaft, and the drainage hole are connected. An auxiliary thrust bearing is arranged in the inner hole at the lower end of the transmission shaft. The transmission shaft is connected to the cavity carrier at the lower end by threads and is positioned by the first connection end face and the second connection end face. A stop sleeve is arranged at the upper end of the cavity carrier. The stop sleeve is connected to the upper end of the near-bit drill string sub by threads, and a thrust bearing is arranged at the upper end of the stop sleeve. The sliding impactor is arranged in the cavity of the cavity carrier and is fixed by the first pin and the second pin. There is an impact hammer inside the sliding impactor. The first pin is arranged in the hole formed by the cooperation of the semi-circular groove in the cavity carrier and the annular notch on the sliding impactor. The second pin is arranged in the hole formed by the cooperation of another semi-circular groove in the cavity carrier and the elongated notch on the sliding impactor. The anti-drop ring is connected to the housing by threads. A thrust roller bearing is arranged between the cavity carrier and the anti-drop ring. An annular spring is arranged between the anti-drop ring and the shaft shoulder of the near-bit drill string sub. The impact shoulder on the near-bit drill string sub and the impact hammer on the sliding impactor cooperate to form a ratchet structure. The lower end joint of the near-bit drill string sub is connected to a PDC bit. These two solutions use a positive displacement motor to drive the impact hammer, and the method of using downhole motor tools to achieve torsional impact consumes a large pressure drop.

[0005] However, a torsional impactor provided by the patent publication number 201010511421.2 of Sinopec Shengli Administration Bureau mainly consists of a drill collar short section, a torsional impact generator and a connecting body. The torsional impact generator mainly consists of a diversion cover, a shaft collar, an impact hammer, a positioning sleeve, a centralizer, a flow cut-off nozzle, a screen pipe, a hammer seat, a support ring and a sealing cover ring. The drill collar short section is on the outside and the torsional impact generator is on the inside. The two are connected with a clearance by the connecting body and positioned by splines. The diversion cover is on the top and the hammer seat is on the bottom. After they are fixed, a cavity is formed inside. Inside the cavity, there are a flow cut-off nozzle, a screen pipe, a positioning sleeve and an impact hammer in sequence from the inside to the outside. There are through holes in the circumferential direction of the impact hammer, the positioning sleeve, the screen pipe and the hammer seat. The impact hammer is machined with an impact hammer head and a starting hammer head. The impact hammer head is enclosed in an impact chamber mainly composed of the hammer seat, the impact hammer and the diversion cover and can rotate. The starting hammer head is enclosed in a starting chamber mainly composed of the impact hammer, the positioning sleeve and the sealing cover ring and can rotate. Shaft collars are installed above and below the impact hammer. The positioning sleeve is supported by a support ring installed on the screen pipe, and a centralizer is installed between the positioning sleeve and the screen pipe.

[0006] A torsional impactor provided by the patent publication number 201320153703.9 of Wenzhou Jiada Machinery Manufacturing Co., Ltd. includes a drill collar short section, a hydraulic torsional impact generator, and a drill bit mounting seat. The hydraulic torsional impact generator is placed inside the drill collar short section. It is characterized in that: the hydraulic torsional impact generator mainly consists of a diversion positioning cover, an upper rotating pressure cover, an impact ram, an impact ram seat, a steering diverter, a flow control nozzle, and a lower rotating pressure cover. Among them, the diversion positioning cover, the upper rotating pressure cover, the impact ram seat, and the lower rotating pressure cover are fixedly arranged with the drill bit mounting seat through bolts. The shaft center positions of the impact ram, the impact ram seat, and the steering diverter are all provided with through holes. Among them, the steering diverter is sleeved on the shaft center through hole of the impact ram, and the impact ram is arranged on the shaft center through hole of the impact ram seat. The impact ram, the impact ram seat, and the steering diverter are all in rotational fit with each other. Among them, the impact ram seat is integrally cylindrical, and two arc-shaped impact chambers are symmetrically arranged on its inner wall. Two groups of water inlet and drain grooves are symmetrically arranged on the inner wall of the impact ram seat and between the impact chambers. Each group of water inlet and drain grooves includes two water inlet grooves and a drain groove located in the middle of the two water inlet grooves. A hole communicating with the water inlet groove is arranged on the upper rotating pressure cover. A hole communicating with the drain groove is arranged on the lower rotating pressure cover. Two cross-sectionally fan-shaped blocks are symmetrically arranged on the outer wall surface of the impact ram. The two fan-shaped blocks are placed in the impact chambers of the impact ram seat, and the outer walls of the fan-shaped blocks are attached to the inner walls of the impact chambers. Water inlet and drain through holes are arranged on both sides of the impact ram where the fan-shaped blocks are located. Arc-shaped convex blocks are symmetrically arranged on the inner wall surface of the impact ram. The positions of the two arc-shaped convex blocks are cross-set with the fan-shaped blocks on the outer wall surface of the impact ram. Through holes are arranged on both sides of the arc-shaped convex blocks. Steering pressure chambers are symmetrically arranged on the outer wall surface of the steering diverter. Drainage grooves are arranged on both sides of each steering pressure chamber. Two water inlet channels are located between the two steering pressure chambers. The water inlet channels communicate with the shaft center through hole of the steering diverter. Among them, the two arc-shaped convex blocks of the impact ram are respectively located in the two steering pressure chambers of the steering diverter, and the tops of the arc-shaped convex blocks are abutted against the bottom surfaces of the steering pressure chambers of the steering diverter. The steering pressure chambers and the drainage grooves are arranged along the axial direction of the steering diverter, and the two ends of the steering pressure chambers and the drainage grooves extend to both ends of the steering diverter. Two arc-shaped drainage channels are symmetrically arranged on the lower rotating pressure cover, and each arc-shaped drainage channel is in cyclic communication with the drainage grooves on both sides of the water inlet channel of the steering diverter.

[0007] In addition, a near-bit torsional impactor provided by Patent Publication No. 201320736377.4 of Bohai Drilling Engineering Company Limited, PetroChina, includes a drill collar nipple, a diverter, a torsional impactor, and an impact drive nipple; the lower part of the drill collar nipple is connected to the impact drive nipple, and a diverter and a torsional impactor are installed between the drill collar nipple and the impact drive nipple; the lower port of the diverter communicates with the inlet of the torsional impactor; the outlet of the torsional impactor communicates with the drive nipple. The torsional impactor includes an upper gland, an impactor housing, a sealing ring, a hydraulic impact chamber, a throttle nozzle, and a pressure relief support ring; the upper gland is installed on the top of the impactor housing, and the sealing ring seals the upper gland and the impactor housing, forming a hydraulic impact chamber inside; a hydraulic hammer, a commutator, a central diverter, and a throttle nozzle are installed in the hydraulic impact chamber; the commutator is located between the central diverter and the hydraulic hammer, and the throttle nozzle is installed at the outlet of the central diverter; the inner wall of the impactor housing is formed with axially symmetric impact grooves, semi-circular grooves, and high-pressure holes; the outer surface of the hydraulic hammer is formed with axially symmetric anvil blocks, and the inner surface has axially symmetric commutator keys, and there are anvil holes and commutator key holes on both sides of the anvil blocks and commutator keys; the anvil blocks on the outer surface of the hydraulic hammer are located in the impact grooves of the impactor housing, and the commutator keys on the inner surface of the hydraulic hammer extend into the commutator grooves of the commutator; the outer surface of the commutator has axially symmetric fan-shaped parts and commutator grooves, there are axially symmetric transition holes on the fan-shaped parts, and there is a pressure relief hole at the lower part of the commutator; the central diverter is composed of a spiral hole and a base, its base is connected to the pressure relief support ring, and the pressure relief support ring is connected to the upper part of the impact drive nipple; the high-pressure holes, commutator grooves, commutator key holes, and semi-circular grooves are sequentially connected to form a pressure relief flow path; the semi-circular groove communicates with the outlet of the torsional impactor; the spiral hole, anvil holes, and impact grooves are sequentially connected to form an impact flow path; the impact grooves communicate with the pressure relief holes through the anvil holes, and the pressure relief holes communicate with the outlet of the torsional impactor; a positioning snap ring is arranged between the torsional impactor and the drive nipple; the male thread at the upper end of the drill collar nipple is connected to the female thread end of the upper drill collar through API standard threads; the lower end of the drive nipple is connected to the male thread end of the drill bit through API standard threads.

[0008] The above three types of impactors all use a rotary valve structure to perform operations. The structural components of the three impactors are all relatively complex, and the impactors are extremely easy to be damaged during use, affecting the normal progress of drilling operations. Summary of the Invention

[0009] The purpose of the present invention is to solve the problems in the prior art, and provides a downhole drill string vibration reduction and torque increase drilling mechanism.

[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions to achieve:

[0011] A downhole drill string vibration reduction and torque increase drilling mechanism includes:

[0012] A housing;

[0013] The upper joint and the lower joint are both fixedly connected to the two ends of the housing. A upper plug is screwed to the bottom of the upper joint, and an impact seat is connected to one end of the lower joint where it is connected to the housing.

[0014] A vibration damping and torque increasing device, one end of which is connected to the upper plug and the other end extends into the impact seat, is used to convert the axial relative vibration of the drill string into a repeated torsional motion.

[0015] Further, the upper plug is connected to the housing through a spline. The vibration damping and torque increasing device includes a torque increasing assembly, and the torque increasing assembly includes:

[0016] A vibration shaft, one end of the vibration shaft is screwed to the upper plug, the other end passes through an impact member and extends into the impact seat, and rolling members are fixedly connected to the outer circumference of the vibration shaft;

[0017] A spiral raceway is provided on the inner side of the impact member, and the rolling members cooperate with the spiral raceway to convert the axial relative motion into a repeated torsional motion of the impact member.

[0018] Further, the rolling members are balls, the number of balls is four, and the four balls are equidistantly arranged.

[0019] Further, the impact member is an impact hammer.

[0020] Further, the vibration damping and torque increasing device further includes a vibration damping assembly, and the vibration damping assembly is arranged inside the housing and is located in the middle of the outer side of the vibration shaft.

[0021] Further, the vibration damping assembly includes an elastic member and a pressure bearing disc. The pressure bearing disc is fixedly connected to the inside of the housing through a positioning screw, and the elastic member is fixedly connected to one side of the pressure bearing disc.

[0022] Further, the vibration damping and torque increasing device further includes a limiting assembly, and the limiting assembly is used to limit the axial displacement of the vibration shaft in the housing.

[0023] Further, the limiting assembly includes an upper pressure disc and a lower pressure disc, and the upper pressure disc and the lower pressure disc are respectively sleeved on both ends of the middle part of the vibration shaft.

[0024] Further, the lower joint is screwed to the housing.

[0025] Further, the diameters of the upper joint, the housing and the lower joint are all equal.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This drilling mechanism combines drill string vibration damping and torsional impact rock breaking, converts the axial vibration of the drill string during drilling into torsional impact, increases the rock breaking torque of the drill bit, improves the rock breaking efficiency, and protects the drill string assembly.

[0028] 2. The drilling mechanism has a simple structure, does not change the existing drilling process and equipment, and does not affect normal circulation and drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0030] Figure 1 Schematic diagram of the overall mechanism of the downhole drill string vibration reduction and torque increase drilling mechanism provided by the present invention;

[0031] Figure 2 Schematic cross-sectional view of the cooperation between the ball and the spiral raceway in the downhole drill string vibration reduction and torque increase drilling mechanism provided by the present invention;

[0032] Figure 3 Schematic cross-sectional view of the cooperation between the upper plug and the vibration shaft in the downhole drill string vibration reduction and torque increase drilling mechanism provided by the present invention;

[0033] Figure 4 Schematic diagram of the cooperation between the ball and the spiral raceway in the downhole drill string vibration reduction and torque increase drilling mechanism provided by the present invention;

[0034] Figure 5 Schematic diagram of the installation of the spring and the pressure-bearing disc in the downhole drill string vibration reduction and torque increase drilling mechanism provided by the present invention;

[0035] Figure 6 Schematic diagram of the operation of the downhole drill string vibration reduction and torque increase drilling mechanism provided by the present invention;

[0036] Wherein: 1. upper joint; 2. upper plug; 3. housing; 4. vibration shaft; 5. spring; 6. pressure-bearing disc; 7. upper pressure plate; 8. ball; 9. impact hammer; 10. lower pressure plate; 11. impact seat; 12. lower joint; 13. positioning screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0040] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, it is 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 should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0041] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0042] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly defined and limited, if terms such as "set", "installed", "connected", "connected to" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings:

[0044] The embodiment of the present invention provides a downhole drill string vibration reduction and torque increase drilling mechanism, including a housing 3, the housing 3 is a tubular structure; an upper sub 1 and a lower sub 12, both fixedly connected to both ends of the housing 3. An upper plug 2 is screwed to the bottom of the upper sub 1, and the upper plug 2 is fitted with the housing 3 through splines, as Figure 3As shown, the spline plays a role in limiting the upper plug 2. One end of the lower joint 12 connected to the housing 3 is connected with an impact seat 11. There is an impact space inside the impact seat 11. The diameters of the upper joint 1, the housing 3 and the lower joint 12 are all equal. A vibration damping and torque increasing device, one end of which is connected to the upper plug 2 and the other end extends into the impact space of the impact seat 11, is used to convert the axial relative vibration of the drill string into a repeated torsional motion.

[0045] Specifically, during the operation, as Figure 1 shown, the upper part of the upper joint 1 is fixedly connected with an upper drill string, and the bottom of the lower joint 12 is fixedly connected with a drill bit. During the drilling process, affected by the rotary operation, longitudinal vibration will occur between the upper drill string and the lower drill bit. The installed vibration damping and torque increasing device can convert the longitudinal vibration into torsional impact vibration, thereby increasing the torque of the drill bit, improving the mechanical rotation speed of the drill bit in medium-hard rock formations and highly abrasive formations, suppressing the stick-slip vibration phenomenon of the PDC and the drill bit, enabling the drill string torque to be smoothly applied to the bottom of the well, and prolonging the service life of the drill bit and the bottom hole assembly.

[0046] In a feasible embodiment, the vibration damping and torque increasing device includes a torque increasing component. The torque increasing component is installed in the middle of the housing 3. The torque increasing component includes a vibration shaft 4. One end of the vibration shaft 4 is screwed to the upper plug 2, and the other end passes through the impact member and extends into the impact seat 11. The circumferential diameter of the impact space is larger than the circumferential diameter of the vibration shaft 4. A rolling member is fixedly connected to the outer circumference of the vibration shaft 4.

[0047] As Figure 2 and Figure 4 shown, a spiral raceway is provided on the inner side of the impact member. The rolling member cooperates with the spiral raceway to convert the axial relative motion into a repeated torsional motion of the impact member. The impact member then knocks the impact seat 11 to transmit the torsional impact force downward to the drill bit for rock breaking. Further, the cam roller cooperation between the rolling member and the impact member can convert the axial relative vibration into a repeated torsional motion of the impact member. Specifically, the rolling member is a ball 8, and the number of balls 8 is four. The four balls 8 are equally spaced. The impact member is an impact hammer 9. The impact hammer 9, the lower joint 12 and the housing 3 are all connected by threads in sequence.

[0048] In a feasible embodiment, the vibration damping and torque increasing device further includes a vibration damping component. The vibration damping component is arranged inside the housing 3 and is located in the middle outside the vibration shaft 4. The vibration damping component is used for vibration damping and transmitting the drilling pressure. Among them, the vibration damping component includes an elastic member and a pressure bearing disc 6. One side of the pressure bearing disc 6 is fixedly connected to the inside of the housing 3 through a positioning screw 13 and is located in the upper middle outside the vibration shaft 4, forming a vibration damping space with the upper plug 2. The elastic member is located in the vibration damping space and is fixedly connected to the side of the pressure bearing disc 6 close to the upper plug 2, as Figure 1 and Figure 5 shown. Specifically, in this embodiment, the elastic member is preferably a spring 5.

[0049] In a feasible embodiment, the vibration damping and torque increasing device further includes a limiting component. The limiting component is sleeved outside the vibration shaft 4 and is located in the lower middle of the vibration shaft 4. The limiting component is used to limit the axial displacement of the vibration shaft 4 in the housing 3. Specifically, the limiting component includes an upper pressing plate 7 and a lower pressing plate 10. The upper pressing plate 7 and the lower pressing plate 10 are respectively sleeved at both ends of the middle part of the vibration shaft 4. The upper pressing plate 7 is located on the side of the pressure-bearing plate 6 away from the spring 5. The lower pressing plate 10 is located between the impact hammer 9 and the impact seat 11. Both opposite sides of the lower pressing plate 10 are clamped with both sides of the impact space of the impact seat 11. The lower pressing plate 10 is closely attached to one side of the impact hammer 9.

[0050] In a feasible embodiment, as Figure 6 shown, the upper joint 1, the upper plug 2 and the vibration shaft 4 form an integral whole among them, and the impact hammer 9, the impact seat 11 and the lower joint 12 form another integral whole. When the two integral wholes are combined together, during the drilling process, there is an axial relative vibration between the two integral wholes. Through the cam roller cooperation between the vibration shaft 4 and the impact hammer 9, the axial relative vibration can be converted into the repeated torque rotation of the impact hammer 9, solving the problem that the torque of the drill bit is often insufficient to break rocks in the prior art, thereby causing the drill bit to stop rotating instantly; at the same time, compared with the existing publicly disclosed patent technologies, the structures of all parts of the drilling mechanism in this embodiment are simple, without changing the existing drilling process and equipment, and without affecting the normal circulation and drilling operations.

[0051] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An underground drill string vibration reduction and torque increase drilling mechanism, characterized in that, it includes: a housing (3); an upper sub (1) and a lower sub (12), both fixedly connected to two ends of the housing (3), a top plug (2) is screwed to the bottom of the upper sub (1), and an impact seat (11) is connected to one end of the lower sub (12) connected to the housing (3); a vibration reduction and torque increase device, one end of which is connected to the top plug (2), and the other end extends into the impact seat (11), for converting the axial relative vibration of the drill string into a repeated torsional motion.

2. The drilling mechanism according to claim 1, characterized in that, the top plug (2) is connected to the housing (3) through a spline, and the vibration reduction and torque increase device includes a torque increase component, and the torque increase component includes: a vibration shaft (4), one end of the vibration shaft (4) is screwed to the top plug (2), and the other end passes through an impact member and extends into the impact seat (11), and a rolling member is fixedly connected to the outer circumference of the vibration shaft (4); a spiral raceway is provided on the inner side of the impact member, and the rolling member cooperates with the spiral raceway to convert the axial relative motion into a repeated torsional motion of the impact member.

3. The drilling mechanism according to claim 2, characterized in that, the rolling member is a ball (8), the number of the balls (8) is four, and the four balls (8) are equidistantly arranged.

4. The drilling mechanism according to claim 2, characterized in that, the impact member is an impact hammer (9).

5. The drilling mechanism according to claim 2, characterized in that, the vibration reduction and torque increase device further includes a vibration reduction component, and the vibration reduction component is arranged inside the housing (3) and is located in the middle of the outer side of the vibration shaft (4).

6. The drilling mechanism according to claim 5, characterized in that, the vibration reduction component includes an elastic member and a pressure bearing plate (6), the pressure bearing plate (6) is fixedly connected to the inside of the housing (3) through a positioning screw (13), and the elastic member is fixedly connected to one side of the pressure bearing plate (6).

7. The drilling mechanism according to claim 2, characterized in that, the vibration reduction and torque increase device further includes a limit component, and the limit component is used to limit the axial displacement of the vibration shaft (4) in the housing (3).

8. The drilling mechanism according to claim 7, characterized in that, the limit component includes an upper pressure plate (7) and a lower pressure plate (10), and the upper pressure plate (7) and the lower pressure plate (10) are respectively sleeved on both ends of the middle part of the vibration shaft (4).

9. The drilling mechanism according to claim 1, characterized in that, the lower sub (12) is screwed to the housing (3).

10. The drilling mechanism according to claim 1, characterized in that, the diameters of the upper sub (1), the housing (3) and the lower sub (12) are all equal.

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