CN109930987A - A kind of mechanical liquid type rock crushing tool, the drill string of multi-load coupling - Google Patents

Abstract

The present invention provides a kind of mechanical liquid type rock crushing tools of multi-load coupling, drill string, the mechanical liquid type rock crushing tool includes upper transmission shaft (5), lower drive shaft (11), bit adapter (21), and the shell being rotatably connected with upper transmission shaft (5), axial anti-thrust structure is equipped between upper transmission shaft (5) and shell；Upper transmission shaft (5) is equipped with the first fluid course, and lower drive shaft (11) is equipped with the self-excited oscillation cavity, and bit adapter (21) is equipped with the second fluid course；The upper end of lower drive shaft (11) is socketed on the first driving face (22) of transmission shaft (5), and the outer surface of upper end has the second driving face (23) for connecting bottom roller seat (9)；The inside of shell is equipped with upper roller seat (7) corresponding with bottom roller seat (9), and upper roller seat (7) is located at the top of bottom roller seat (9).Mechanical liquid type rock crushing tool provided by the invention can be realized multi-load coupling, is conducive to drilling tool and obtains higher broken rock energy.

Description

A multi-load coupled mechanical-hydraulic rock-breaking tool and drill string

technical field

The invention relates to the technical field of drilling operations, in particular to a multi-load coupled mechanical-liquid rock-breaking tool and a drill string.

Background technique

With the gradual acceleration of the oil and gas exploration and development process, the continuous expansion of the exploration area, and the continuous increase of the drilling depth, the hardness and strength of the rock will increase significantly under the action of the confining pressure of the deep formation, resulting in a decrease in the rock breaking efficiency of the drill bit as the depth increases. The aging is decreasing and the life of the drill bit is decreasing.

Due to the common problems of insufficient rock-breaking energy and large rock-breaking resistance of the drill bit, single rotary drilling can no longer meet the drilling aging requirements of deep hard formations and soft-hard staggered formations. For weak points such as low tensile strength and impact resistance, an axial impact tool is attached to the upper end of the drill bit, and a certain frequency of reciprocating impact force is applied to the rock while the drill bit rotates to break the rock, thereby improving the rock breaking energy and accelerating the rock damage. broken purpose.

At present, there are many types of impact tools used in rotary percussion drilling technology, but generally they can only provide a single rock-breaking impact load, usually mechanical impact load, hydraulic impact load or hydraulic pulse jet. A single rock-breaking impact load can provide Therefore, how to provide an impact tool that can realize multi-load coupling, so as to increase the rock-breaking energy, so as to speed up the drilling operation of deep wells and ultra-deep wells, improve the efficiency and shorten the drilling cycle, has become a technology in the art. Technical problems that people need to solve urgently.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a multi-load coupling mechanical-hydraulic rock-breaking tool and drill string, the drill string includes the mechanical-hydraulic rock-breaking tool, and the mechanical-hydraulic rock-breaking tool can realize multi-load coupling Drilling is beneficial for drilling tools to obtain higher rock breaking energy and drilling time.

In order to achieve the above object, the present invention provides the following technical solutions:

A multi-load coupled mechanical-hydraulic rock-breaking tool, comprising:

An upper transmission shaft with a first liquid flow channel is arranged inside the upper transmission shaft, and the lower end portion of the outer surface of the upper transmission shaft has a first transmission surface;

The inner part is provided with a lower transmission shaft of a self-excited oscillation cavity, the upper end of the lower transmission shaft is sleeved on the first transmission surface, the self-excited oscillation cavity is communicated with the first liquid flow channel, and the lower transmission shaft is connected to the first transmission surface. The upper end of the outer surface of the transmission shaft has a second transmission surface;

a lower roller seat sleeved on the second transmission surface, the lower roller on the lower roller seat is higher than the upper surface of the lower roller seat;

A casing that is sleeved on the outside of the upper transmission shaft and is rotatably connected to the upper transmission shaft, an upper roller seat corresponding to the lower roller seat is installed inside the casing, and the upper roller seat is located at the Above the lower roller seat, the upper roller on the upper roller seat is lower than the lower surface of the upper roller seat, and an axial thrust structure is arranged between the upper transmission shaft and the housing;

The drill bit joint is fixedly connected with the lower end of the lower transmission shaft, and the inside of the drill bit joint is provided with a second liquid flow channel which is communicated with the self-excited oscillation cavity.

Preferably, in the above-mentioned mechanical-hydraulic rock breaking tool, the casing includes an upper casing, a middle joint and a lower casing, both ends of the middle joint are provided with external threads, and the upper casing and the lower casing are provided with external threads. The housing is threadedly connected with the middle joint, the upper transmission shaft is provided with a lock nut threadedly connected with the upper transmission shaft, and the upper surface of the middle joint cooperates with the lower surface of the lock nut to form the shaft To the thrust structure.

Preferably, in the above-mentioned mechanical-hydraulic rock breaking tool, the lower end portion of the middle joint has an internal thread for connecting the upper roller seat.

Preferably, in the above-mentioned mechanical-hydraulic rock breaking tool, a radial sliding bearing and a ball bearing string are installed in the upper casing, and the ball bearing string is located between the radial sliding bearing and the lock nut, so The upper end portion of the upper transmission shaft has an external thread for connecting the inner ring of the radial sliding bearing.

Preferably, in the above-mentioned mechanical-hydraulic rock breaking tool, the material of the radial sliding bearing is cemented carbide.

Preferably, in the above-mentioned machine-liquid rock breaking tool, the self-excited oscillation cavity includes a primary oscillation cavity and a secondary oscillation cavity, an upper nozzle is installed above the primary oscillation cavity, and the first level oscillation cavity is provided with an upper nozzle. The bottom of the oscillating chamber has a middle nozzle, and the bottom of the secondary oscillation chamber has a lower nozzle.

Preferably, in the above-mentioned mechanical-hydraulic rock-breaking tool, the upper end portion of the outer surface of the drill bit joint has a third transmission surface, and the third transmission surface is sleeved with a transmission joint that is threadedly connected to the lower transmission shaft , the upper end of the drill bit joint is provided with an anti-drop nut for preventing the drill bit joint from falling.

Preferably, in the above-mentioned mechanical-hydraulic rock breaking tool, the part connecting the lower transmission shaft and the transmission joint is tapered.

Preferably, in the above-mentioned mechanical-hydraulic rock breaking tool, the first transmission surface is a regular hexagonal transmission surface, and the second transmission surface is a spline transmission surface.

A drill string comprising the mechanical hydraulic rock breaking tool as disclosed in any one of the above.

According to the above technical solutions, in the hydraulic rock breaking tool provided by the present invention, the upper end of the lower transmission shaft is connected with the upper transmission shaft through the first transmission surface, the lower end is fixedly connected with a drill bit joint, and the first inner part of the upper transmission shaft is The liquid flow channel, the self-excited oscillation cavity inside the lower drive shaft, and the second liquid flow channel inside the drill bit joint are connected, so through a series of modulation actions such as frequency selection and amplification of the self-excited oscillation cavity, the drilling fluid can form a high frequency The pulsed jet can also make the drilling fluid form a periodically changing low-pressure vortex ring and a high-pressure energy gathering area, forcing the gas originally dissolved in the drilling fluid in a low-pressure environment to escape to form bubbles, using the moment when the bubbles shrink and burst in a high-pressure environment The resulting shock wave forms a hydraulic shock.

At the same time, in the machine-hydraulic rock breaking tool provided by the present invention, the lower drive shaft is connected to the lower roller seat through the second transmission surface, and an upper roller seat corresponding to the lower roller seat is installed inside the casing. The lower roller is higher than the upper surface of the lower roller seat, and the upper roller on the upper roller seat is lower than the lower surface of the upper roller seat, so when the upper transmission shaft drives the lower transmission shaft and the lower roller seat to rotate together, the cycle between the lower roller and the upper roller Contact and separation, and periodically lift the casing, and an axial thrust structure is arranged between the upper transmission shaft and the casing, so the drilling pressure is transmitted to the upper transmission shaft through the casing to form a mechanical impact.

To sum up, the mechanical-hydraulic rock-breaking tool provided by the present invention can generate three loads of hydraulic shock, mechanical shock and pulse jet, so as to have a multi-load coupling function, which is beneficial for the drilling tool to obtain higher rock-breaking energy. The application of the mechanical-hydraulic rock-breaking tool provided by the invention can increase the speed and efficiency of the drilling construction of deep wells and ultra-deep wells, and shorten the drilling period.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic diagram of a multi-load coupled mechanical-liquid rock-breaking tool provided in Embodiment 1 of the present invention;

Fig. 2 is the A-A cross-sectional schematic diagram in Fig. 1;

Fig. 3 is the B-B cross-sectional schematic diagram in Fig. 1;

Fig. 4 is the schematic diagram of piece 8 and piece 9 in Fig. 1;

FIG. 5 is a schematic diagram of the mechanism of rock-breaking operation using the rock-breaking tool provided by the present invention.

The figure is marked as:

1. Upper shell; 2. Radial sliding bearing; 3. Ball bearing string; 4. Lock nut; 5. Upper transmission shaft; 6. Middle joint; 7. Upper roller seat; 8. Upper roller; 9. Lower roller Seat; 10. Lower roller; 11. Lower transmission shaft; 12. Lower casing; 13. Lower joint; 14. Upper nozzle; 15. Primary oscillation chamber; 16. Middle nozzle; 17. Secondary oscillation chamber; 18. Lower nozzle; 19, anti-dropping nut; 20, transmission joint; 21, drill bit joint; 22, first transmission surface; 23, second transmission surface; 24, third transmission surface; I, first liquid flow channel; II, The second liquid flow channel; H, the lifting height.

Detailed ways

For ease of understanding, the present invention will be further described below with reference to the accompanying drawings.

Example 1

Referring to FIGS. 1 to 4, FIG. 1 is a schematic diagram of a multi-load coupled mechanical-hydraulic rock-breaking tool provided in Embodiment 1 of the present invention; FIG. 2 is a schematic cross-sectional view of A-A in FIG. 1; B-B cross-sectional schematic diagram; FIG. 4 is a schematic diagram of parts 8 and 9 in FIG. 1 .

A multi-load coupled mechanical-hydraulic rock-breaking tool provided in the first embodiment includes an upper transmission shaft 5, a lower transmission shaft 11, a drill bit joint 21, and a case.

Wherein, the inside of the upper transmission shaft 5 is provided with a first liquid flow channel I, and the lower end portion of the outer surface of the upper transmission shaft 5 has a first transmission surface 22;

The upper end of the lower transmission shaft 11 is sleeved on the first transmission surface 22, a self-excited oscillation cavity is arranged inside the lower transmission shaft 11, the self-excited oscillation cavity is communicated with the first liquid flow channel I, and the outer surface of the lower transmission shaft 11 is The upper end has a second transmission surface 23, the second transmission surface 23 is sleeved with a lower roller seat 9, and the lower roller 10 on the lower roller seat 9 is higher than the upper surface of the lower roller seat 9;

An upper roller seat 7 corresponding to the lower roller seat 9 is installed inside the casing, the upper roller seat 7 is located above the lower roller seat 9, and the upper roller 8 on the upper roller seat 7 is lower than the lower surface of the upper roller seat 7, An axial thrust structure is arranged between the upper transmission shaft 5 and the housing;

The drill bit joint 21 is fixedly connected with the lower end of the lower transmission shaft 11 , and a second liquid flow channel II that communicates with the self-excited oscillation cavity is opened inside the drill bit joint 21 .

The machine-hydraulic rock-breaking tool provided by the present invention can generate the following three kinds of loads: hydraulic shock, mechanical shock and pulse jet, and its working principle is introduced below:

(1) Working principle of hydraulic shock

The drilling fluid passes through the first liquid flow channel I inside the upper drive shaft 5 to form a continuous jet, enters the self-excited oscillation cavity inside the lower drive shaft 11, and undergoes a series of processes such as frequency selection and amplification to form periodically changing low-pressure vortex rings and The high pressure energy gathering area forces the gas originally dissolved in the drilling fluid in the low pressure environment to escape to form bubbles. The bubbles shrink and burst under the high pressure environment, and the shock wave generated at the moment of rupture is transmitted down to the drill bit through the drill bit joint 21 .

(2) The working principle of mechanical shock

The casing itself does not rotate, and the upper roller seat 7 installed inside the casing does not rotate, but the upper transmission shaft 5 rotates, and drives the lower transmission shaft 11 to rotate together through the first transmission surface 22, and the lower transmission shaft 11 passes through the second transmission. The surface 23 drives the lower roller seat 9 to rotate together. During the rotation of the lower roller seat 9, the lower roller 10 contacts the upper roller 8 and produces rolling friction, forcing the upper roller 8 to lift upward, and the upper roller 8 drives the upper roller seat 7 and The casing overcomes the drilling pressure and self-weight to lift together. Since the axial thrust structure is arranged between the upper transmission shaft 5 and the casing, the upper transmission shaft 5 is also lifted together. After the upper roller 8 is separated from the lower roller 10, the drilling pressure is transmitted to the upper transmission shaft 5 through the casing, and drives the upper transmission shaft 5 to accelerate downward to impact the lower transmission shaft 11, thereby converting the drilling pressure into mechanical impact force. The stress wave generated by the impact is transmitted down to the drill bit through the lower drive shaft 11 and the drill bit joint 21 .

In a specific practical application, the adjustment of the mechanical impact force can be realized by changing the lifting height H of the upper roller 8 along the surface of the lower roller 10. The higher the lifting height H, the longer the impact stroke of the upper drive shaft 5 under the action of the drilling pressure, the resulting The greater the impact force, the smaller the vice versa. The lifting height H can be set to 3mm to 10mm according to the drillability grade value (grade 5 to 10) of rock in different formations.

The adjustment of the mechanical impact frequency can be realized by changing the number of the upper roller 8 and the lower roller 10. The more the upper roller 8 and the lower roller 10 are, the more times the upper roller 8 is lifted along the surface of the lower roller 10 per unit number of turns. The higher the frequency of the shock generated, the smaller the vice versa. The number of the upper rollers 8 and the lower rollers 10 can be set to 2 to 8 according to the drillability grade value (grade 5 to 10) of rocks in different formations.

(3) Working principle of pulsed jet

The drilling fluid is ejected from the lower drive shaft 11 after a series of modulation actions such as frequency selection and amplification of the self-excited oscillation cavity to form a high-frequency pulse jet. The other part acts on the surface of the broken cuttings.

Referring to FIG. 5, it is a schematic diagram of the mechanism of rock-breaking operation using the rock-breaking tool provided by the present invention. When rock-breaking operation is carried out, firstly, high frequency (greater than 40Hz) and low amplitude (5-20kN) hydraulic shock load are used for high frequency and high frequency. The reciprocating action on the bottom of the well accelerates the expansion and damage of rock cracks, reduces the inherent strength of the rock, and produces the effect shown in part (a) of Figure 5;

Then, the low-frequency (8-14Hz) high-amplitude (150J-650J) mechanical shock load makes up for the weak energy of the hydraulic shock load, forcing the bit cutter to invade the rock surface that has already produced a large number of damage cracks, and excavate a large area of volume. The pit is broken, so as to achieve the effect of leap-forward footage, as shown in part (b) of Figure 5;

Finally, supplemented by high-frequency (greater than 40Hz) pulsed jet, part of it acts on the micro-cracks of the bottom hole rock to produce a water wedge effect, which promotes crack propagation and accelerates rock fracture, and the other part acts on the surface of the broken cuttings to increase the cuttings. The kinetic energy can be transported to improve the stress state and flow field environment of the cuttings, so as to improve the effect of rock breaking and clearing, as shown in part (c) of Figure 5.

During the drilling process, attention should be paid to controlling the WOB (40-120kN), the rotational speed (50-65rpm) and the drilling fluid displacement (35-60L/s) according to the drilling tool assembly and the type of the drill bit, so that the rock-breaking tool can generate high frequency. Low-amplitude hydraulic shock load, low-frequency high-amplitude mechanical shock load and high-frequency pulsed jet cooperate with the drill bit to realize rock-breaking drilling under the action of multi-load coupling.

For example, when drilling into medium-hard-hard formations with rock drillability grades of 5 to 7, the screw drilling tool and PDC bit can be selected, and the upper drive shaft 5 of the rock-breaking tool and the power end of the screw drilling tool can be universally rotated. The shafts are connected, the upper shell 1 of the rock breaking tool is connected with the shell of the screw drilling tool, the number of the upper rollers 8 and the lower rollers 10 is set to 6-8, the lifting height H is set to 6-10mm, and the drilling pressure is controlled. At 80-120kN, the rotational speed is controlled at 50-60rpm, and the drilling fluid displacement is controlled at 50-60L/s, so that the mechanical impact performance parameters of the rock-breaking tool can reach a frequency of 9-15Hz and an impact power of 480-1200J. More than 40Hz) low-amplitude (10-20kN) hydraulic shock load and high-frequency pulse jet (more than 40Hz), so as to realize rock-breaking drilling of PDC bit under the action of multi-load coupling.

For another example, when drilling into a hard-hard formation with a rock drillability grade of 8 to 10, a turbo drilling tool and an impregnated diamond bit can be selected to connect the upper drive shaft 5 of the rock breaking tool with the power end of the turbo drilling tool. The rotors are connected, the upper casing 1 of the rock breaking tool is connected to the outer casing of the turbo drilling tool, the number of the upper rollers 8 and the lower rollers 10 is set to 2 to 3, the lifting height H is set to 3 to 5 mm, and the drilling pressure is controlled At 40-60kN, the speed is controlled at 55-65rpm, and the drilling fluid displacement is controlled at 35-40L/s, so that the mechanical impact performance parameters of the rock-breaking tool can reach a frequency of 16-24Hz and an impact power of 120-300J. More than 30Hz) low-amplitude (5~15kN) hydraulic shock load and high-frequency pulse jet (more than 30Hz), so as to realize rock-breaking drilling of impregnated diamond bits under the action of multi-load coupling.

The following beneficial effects can be obtained by applying the machine-hydraulic rock-breaking tool provided by the present invention:

① The high-frequency low-amplitude hydraulic shock load, the low-frequency high-amplitude mechanical shock load, and the high-frequency pulsed jet work together on the bottom hole rock to form a joint rock breaking under the action of multiple loads.

②The axial oscillation of the casing helps to reduce friction and drag, and reduce the bottom hole support pressure and the lateral whirl and circumferential stick-slip of the drill bit.

③According to the rock mechanics parameters of different formations, the required impact load and impact frequency can be obtained by adjusting different WOB and displacement.

As shown in FIG. 1 , in the first embodiment, the casing includes an upper casing 1 , a middle joint 6 and a lower casing 12 . Both ends of the middle joint 6 are provided with external threads. The upper casing 1 and the lower casing 12 are connected to the middle casing 12 . The joint 6 is threadedly connected, the upper transmission shaft 5 is provided with a lock nut 4 that is threadedly connected with the upper transmission shaft 5, the upper surface of the middle joint 6 cooperates with the lower surface of the lock nut 4 to form an axial thrust structure, and the lower housing 12 has an axial thrust structure. The lower end portion has an inner thread and is connected with the outer thread of the lower joint 13 .

In order to fix and install the upper roller seat 7 , in the first embodiment, the lower end portion of the middle joint 6 has an inner thread for connecting the upper roller seat 7 .

In order to realize the rotatable connection between the casing and the upper transmission shaft 5, in the first embodiment, the upper casing 1 is equipped with a radial sliding bearing 2 and a ball bearing string 3, and the ball bearing string 3 is located between the radial sliding bearing 2 and the lock nut 4 In between, the upper end portion of the upper transmission shaft 5 has an external thread for connecting the inner ring of the radial sliding bearing 2 .

In specific practical applications, the material of the radial sliding bearing 2 can be hard alloy.

As shown in FIG. 1 , in the first embodiment, the self-excited oscillation cavity includes a primary oscillation cavity 15 and a secondary oscillation cavity 17 , an upper nozzle 14 is installed above the primary oscillation cavity 15 , and the bottom of the primary oscillation cavity 15 has a In the middle nozzle 16, the bottom of the secondary oscillation chamber 17 has a lower nozzle 18.

1 and 3, in order to install the drill bit joint 21 on the lower transmission shaft 11, in the first embodiment, the upper end portion of the outer surface of the drill bit joint 21 has a third transmission surface 24, and the third transmission surface 24 is sleeved with a The drive joint 20 threadedly connected with the lower drive shaft 11, the upper end of the drill bit joint 21 is provided with an anti-drop nut 19 for stopping the drop of the drill bit joint 21. It can be seen from FIG. 1 that the drill bit joint 21 passes through the drive joint 20 and the anti-drop nut 19. When installed on the lower transmission shaft 11 , the outer diameter of the anti-drop nut 19 is larger than the size of the through hole of the transmission joint 20 , so that the drill bit joint 21 can be prevented from falling off the lower transmission shaft 11 .

In a specific practical application, the third transmission surface 24 may be a regular octagonal transmission surface. For reliable connection, the part connecting the lower transmission shaft 11 with the transmission joint 20 can be designed to be tapered.

Embodiment 2

As shown in FIG. 2 , in the first embodiment, the first transmission surface 22 is a regular hexagonal transmission surface, and the second transmission surface 23 is a spline transmission surface. The only difference between the second embodiment and the first embodiment is that the shape of the first transmission surface 22 is different. In the second embodiment, the first transmission surface 22 is a square transmission surface.

The present invention also provides a drill string, which includes the mechanical-hydraulic rock-breaking tool disclosed in the above embodiments. Since the mechanical-hydraulic rock-breaking tool disclosed in the above-mentioned embodiments has the above-mentioned technical effects, the drill string having the mechanical-hydraulic-type rock-breaking tool also has the above-mentioned technical effects, which will not be repeated here.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a kind of mechanical liquid type rock crushing tool of multi-load coupling characterized by comprising

It is internally provided with the upper transmission shaft (5) of the first fluid course (I), the end portion of the outer surface of the upper transmission shaft (5) With the first driving face (22)；

Its lower drive shaft for being internally provided with the self-excited oscillation cavity (11), the upper end of the lower drive shaft (11) are socketed in described first On driving face (22), the self-excited oscillation cavity is connected to first fluid course (I), the outer surface of the lower drive shaft (11) Upper end have the second driving face (23)；

The bottom roller seat (9) being socketed on second driving face (23), the bottom roller (10) on the bottom roller seat (9) are higher by The upper surface of the bottom roller seat (9)；

Cover in the outside of the upper transmission shaft (5), the shell being rotatably connected with the upper transmission shaft (5), the shell it is interior Portion is equipped with upper roller seat (7) corresponding with bottom roller seat (9), and the upper roller seat (7) is located at the bottom roller seat (9) top, the upper roller (8) on the upper roller seat (7) are lower than the lower surface of the upper roller seat (7), the upper transmission Axial anti-thrust structure is provided between axis (5) and the shell；

The inside of the bit adapter (21) being fixedly connected with the lower end of the lower drive shaft (11), the bit adapter (21) opens up There is the second fluid course (II) being connected to the self-excited oscillation cavity.

2. mechanical liquid type rock crushing tool according to claim 1, which is characterized in that the shell include upper housing (1), in connect Head (6), lower case (12), the both ends of the center tap (6) are provided with external screw thread, the upper housing (1) and the lower case (12) it is threadedly coupled with the center tap (6), is provided on the upper transmission shaft (5) and is threadedly coupled with the upper transmission shaft (5) Locknut (4), the upper surface of the center tap (6) and the lower surface of the locknut (4) cooperatively form the axial anti-thrust structure.

3. mechanical liquid type rock crushing tool according to claim 2, which is characterized in that the end portion of the center tap (6) has There is the internal screw thread for connecting the upper roller seat (7).

4. mechanical liquid type rock crushing tool according to claim 3, which is characterized in that be equipped with radial direction in the upper housing (1) Sliding bearing (2) and ball bearing string (3), the ball bearing string (3) are located at the bush(ing) bearing (2) and the locknut (4) Between, the upper part of the upper transmission shaft (5) has the external screw thread for connecting the inner ring of the bush(ing) bearing (2).

5. mechanical liquid type rock crushing tool according to claim 4, which is characterized in that the material of the bush(ing) bearing (2) For hard alloy.

6. mechanical liquid type rock crushing tool according to claim 1, which is characterized in that the self-excited oscillation cavity includes level-one oscillation Chamber (15) and second level oscillation chamber (17), the level-one vibrates to be equipped with top nozzle (14) above chamber (15), the level-one oscillation The bottom of chamber (15) has middle nozzle (16), and the bottom of second level oscillation chamber (17) has lower nozzle (18).

7. mechanical liquid type rock crushing tool according to claim 1, which is characterized in that the outer surface of the bit adapter (21) Upper part has third driving face (24), is socketed on the third driving face (24) and connects with the lower drive shaft (11) screw thread The drive joint (20) connect, the upper end of the bit adapter (21) is equipped with prevents for what bit adapter described in backstop (21) was fallen Fall nut (19).

8. mechanical liquid type rock crushing tool according to claim 7, which is characterized in that the lower drive shaft (11) and the transmission The part of connector (20) connection is taper.

9. mechanical liquid type rock crushing tool described according to claim 1~any one of 8, which is characterized in that first transmission Face (22) is regular hexagon driving face, and second driving face (23) is spline drived face.

10. a kind of drill string, which is characterized in that the drill string includes that the mechanical liquid type as described in any one of claim 1~9 is broken Rock tool.