WO2022228397A1

WO2022228397A1 - Rotary steerable drilling tool

Info

Publication number: WO2022228397A1
Application number: PCT/CN2022/089025
Authority: WO
Inventors: 徐梓辰; 万晓跃
Original assignee: 徐梓辰
Priority date: 2021-04-25
Filing date: 2022-04-25
Publication date: 2022-11-03
Also published as: CN115247535A

Abstract

Disclosed is a rotary steerable drilling tool. The tool comprises a drill bit (1), a steering section (2), a flexible drill string (3), a propulsion mechanism (4), and an electric drive actuator (5), the steering section comprising a bearing body (21), the drill bit being connected to the lower part of the bearing body, and a steering mechanism (211) being connected to the bearing body; the flexible drill string comprises a torque transfer string (31) and a pressure-bearing hose (32), the lower end of the torque transfer string being connected to the upper end of the bearing body; the propulsion mechanism is connected onto the bearing body and is in communication with the flexible drill string, and the propulsion mechanism can drive the drill bit to drill or pull the flexible drill string to advance; the electric drive actuator is electrically connected to the steering mechanism, and the electric drive actuator can control the action of the steering mechanism. The present rotary steerable drilling tool can implement short radius directional drilling, and the propulsion mechanism can assist the flexible drill string to advance or push the drill bit to drill, thereby achieving short radius steerable drilling with a certain wellbore extension length.

Description

Rotary Steering Drilling Tools

Related applications

This application claims the priority of the Chinese invention patent with the patent application number 202110448977.X, the application date is April 25, 2021, and the invention name is "Rotary Steering Drilling Tool".

technical field

The invention relates to the technical field of drilling technology and oil and gas exploitation, in particular to a rotary steerable drilling tool.

Background technique

Exploration and development of underground material resources and space resources require extensive application of drilling technology. The existing steerable drilling technologies mainly include downhole motor steerable drilling technology and rotary steerable drilling technology. The maximum build-up rate that can be achieved by the above technologies is generally not more than 15°/30 meters, and it is impossible to achieve short-radius steerable drilling with a controllable drilling trajectory or continue steerable drilling at the bottom of the existing short-radius well section. In the prior art, there are many radial or short-radius drilling technologies that cannot effectively control the wellbore trajectory, and such technologies have poor effects on the development and utilization of underground resources.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a rotary steerable drilling tool capable of realizing a certain wellbore extension length.

Above-mentioned purpose of the present invention can adopt following technical scheme to realize:

The present invention provides a rotary steerable drilling tool, comprising:

drill;

a guide section, which includes a bearing body, the drill bit is connected to the lower part of the bearing body, and a guiding mechanism is connected to the bearing body;

A flexible drill string, which includes a torque transmission string and a pressure-bearing hose, the torque transmission string is passed through the inside of the pressure-bearing hose, or the pressure-bearing hose is passed through the torque transmission string Inside the row, the lower end of the torque transmission series is connected to the upper end of the bearing body;

a propulsion mechanism, which is connected to the carrying body and communicated with the flexible drill string, and the propulsion mechanism can drive the drill bit to drill or pull the flexible drill string to advance;

An electric drive actuator is electrically connected to the guide mechanism, and the electric drive actuator can control the movement of the guide mechanism.

The features and advantages of the present invention are:

The rotary steerable drilling tool of the present invention is mainly used for short-plate radius steerable drilling with a diameter ranging from 0.0254 mm to 0.127 m and a turning radius of less than 10 meters. The flexible drill string is pulled by the propulsion mechanism to achieve drilling. The pressure-bearing hose in the flexible drill string bears the tension and acts as a seal. The torque transmission series only needs to realize the simple function of torque transmission, which greatly simplifies the torque transmission series. The complexity greatly reduces the diameter of the flexible drill string, and can realize drilling, drilling and torque transmission within a smaller diameter range. A steering mechanism is provided, so that the steering mechanism can drive the drill bit to deflect in a preset direction under the condition of rotation, so as to change the wellbore trajectory, so as to realize short-radius directional drilling; by setting the propulsion mechanism, it can assist the advancement of the flexible drill string. Or push the drill bit to drill, so as to realize small-diameter and short-radius steerable drilling with a certain extension length of the wellbore. The invention adopts composite material pipe, rubber pipe or slit pipe filled with sealing material in the slit as the pressure-bearing hose, which controls the weight of the flexible drill string to the maximum extent, so that it can be smoothly pulled by the propulsion mechanism.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Fig. 1 is the structural representation of the rotary steerable drilling tool of the present invention;

Fig. 2 is the enlarged structural representation of A part in Fig. 1;

Fig. 3 is another structural representation of the rotary steerable drilling tool of the present invention;

Fig. 4 is a schematic diagram of enlarged structure of part B in Fig. 3;

Fig. 5 is the structural representation of closed structure;

Fig. 6 is the first kind of structural representation of flexible drill string;

Fig. 7 is the second kind of structural representation of flexible drill string;

Fig. 8 is the third structural schematic diagram of the flexible drill string;

Fig. 9 is another structural schematic diagram of the rotary steerable drilling tool of the present invention.

Description of reference numbers:

1. Drill bit; 11. Front blade; 12. Front nozzle;

2. Guiding section; 21. Bearing body; 211. Guiding mechanism; 2111, accommodating cavity; 2112, driving piston; 212, gauge structure; 22, packing ring;

3. Flexible drill string; 31. Torque transmission tandem; 311, Torque transmission sub joint; 312, Variable angle force transmission structure; 3123, Ball head; 3124, Ball seat; 3125, Torque transmission groove; 3126, Torque transmission pin; 3127, seal; 32, pressure hose; 33, through flow channel;

4. Propulsion mechanism; 41. Anti-nozzle; 42. Drainage nozzle; 43. Closed structure; 431. Throat;

5. Electric drive actuator; 51, electric motor; 52, rotary valve; 521, rotary valve disc; 522, rotary valve seat;

6. Drive drill string; 7. Steering device; 8. Anchoring device; 9. Control sub joint; 91. Control circuit; 92. Jumper line; 10. Downhole power supply; Z, main wellbore; F, branch well Eye.

Detailed ways

In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present invention provides a rotary steerable drilling tool, which comprises a drill bit 1, a steering segment 2, a flexible drill string 3, a propulsion mechanism 4 and an electric drive actuator 5, in:

The drill bit 1 may include a front blade 11 with cutting ability and a front nozzle 12 with jet rock breaking ability. During the drilling process, the drilling power mainly comes from the WOB and torque transmitted by the flexible drill string 3 to the front blade 11 , the secondary power is the high-pressure water jet passing through the front nozzle 12 to break the rock. The front nozzle 12 can carry the rock in time to avoid repeated crushing and cool the front blade 11 in time. Or, the drilling power mainly comes from high pressure The water jet passes through the jet of the front nozzle 12 to break the rock, and the secondary power is the WOB and torque transmitted by the flexible drill string 3 to the front blade 11. The front blade 11 can further smooth the well wall. , when the angle set by the front nozzle 12 is relatively small, the size of the new wellbore formed by the jet is relatively small; on the contrary, when the angle set by the front nozzle 12 is relatively large, the size of the new wellbore formed by the jet is also relatively large. The formed wellbore trajectory is not smooth, and the wellbore formed solely by the water jet breaking rock is not conducive to the working stability of the steering actuator, and will cause difficulties in stable steering and fine control of the wellbore trajectory, and the front blade 11 can To assist in scraping the well wall and leveling the wellbore, it is conducive to ensuring the stability of steerable drilling and realizing the fine control of the wellbore trajectory. In some cases, the drill bit 1 mainly used for rock breaking by jet nozzles is suitable for wellbores with smaller diameters, and the specific structures of the front blade 11 and the front nozzle 12 are in the prior art, and will not be repeated here;

The guide section 2 includes a bearing body 21, the drill bit 1 is connected to the lower part of the bearing body 21, and a guide mechanism 211 is connected to the bearing body 21. The guide mechanism 211 can drive the drill bit 1 and the guide section 2 to deflect in a preset direction, thereby changing the well. Eye trajectories to achieve short build slopes;

The flexible drill string 3 includes a torque transmission series 31 and a pressure-bearing hose 32 . The torque transmission series 31 is passed through the inside of the pressure-bearing hose 32 , or the pressure-bearing hose 32 is passed through the inside of the torque transmission series 31 , the lower end of the torque transmission series 31 is connected to the upper end of the bearing body 21 , the torque transmission series 31 is used to transmit the torque required for drilling and a small part of the drilling pressure, and the interior of the flexible drill string 3 is communicated with the interior of the bearing body 21 form a flow channel;

The propulsion mechanism 4 is connected to the bearing body 21 and communicated with the flexible drill string 3. The propulsion mechanism 4 can drive the drill bit 1 to drill or pull the flexible drill string 3 forward. Due to the extremely short turning radius, it is necessary to maximize the flexibility of the drill string. In order to adapt to the extremely small turning radius, as the flexibility of the flexible drill string 3 continues to increase, its ability to transmit WOB decreases. Therefore, the advancement of the flexible drill string 3 can be well assisted by the propulsion mechanism 4;

The electric drive actuator 5 is electrically connected with the guide mechanism 211 , and the electric drive actuator 5 can control the action of the guide mechanism 211 , so that the operation of driving the guide mechanism 211 to realize the rotational guidance becomes simple and convenient.

In the rotary steerable drilling tool of the present invention, by setting the steering mechanism 211, the steering mechanism 211 can drive the drill bit 1 to deflect in a preset direction under the condition of rotation, so as to change the wellbore trajectory, thereby realizing a short build-up rate; by setting the propulsion mechanism 4 , which can well assist the flexible drill string 3 to advance or push the drill bit 1 to drill, so as to realize short-radius steerable drilling with a certain wellbore extension length.

In an embodiment of the present invention, as shown in FIGS. 1 and 2 , the propulsion mechanism 4 includes at least two counter-nozzles 41 arranged at intervals along the circumferential direction of the carrier body 21 , the inlet of the counter-nozzles 41 is connected to the flexible drill string 3 . The inner through flow channel 33 is connected, and the high-pressure water flow can enter the return nozzle through the flow channel. The reverse nozzle 41 provides all or part of the axial force to push the rock breaking and/or pull the flexible drill string 3 forward. The axial force refers to Along the axial direction of the guide section 2, the reverse nozzle 41 utilizes the drilling circulating medium conveyed by the flexible drill string 3 to realize the forward drilling power provided by reverse jetting. Further, the reverse nozzle 41 cooperates with the drill bit 1, because the drill bit 1 The forward resistance received during the drilling process is opposite to the axial drag force provided by the anti-nozzle 41, so when the drill bit 1 uses the front blade 11 as the main power, the hydraulic energy is only used as an auxiliary. The hydraulic energy mainly plays the role of cleaning the wellbore; when the drill bit 1 is mainly powered by the jet nozzle, the hydraulic energy should play the role of breaking the bottom layer. Sufficient axial drag force, preferably, 3 to 8 anti-nozzles 41 are arranged along the circumferential direction of the carrying body 21 .

In another embodiment of the present invention, as shown in FIG. 3 , FIG. 4 and FIG. 5 , the propulsion mechanism 4 includes a drainage nozzle 42 and a closing structure 43 , the closing structure 43 is sleeved on the outside of the carrying body 21 , and the closing structure 43 has The throat 431, the drainage nozzle 42 is connected to the lower end of the throat 431, the inlet of the throat 431 is communicated with the flexible drill string 3 through the drainage nozzle 42, that is, the throat 431 is communicated with the through flow channel 33 through the drainage nozzle 42, and the drainage nozzle 42 can spray high-pressure fluid toward the extension direction of the throat 431, and the fluid sprayed by the drainage nozzle 42 drives the fluid below the closed structure 43 to flow to the top of the closed structure 43, so that a pressure difference is generated above and below the closed structure 43, and the pressure difference can Push drill bit 1 forward.

In an embodiment of the present invention, as shown in FIG. 1 , FIG. 3 , FIG. 6 and FIG. 7 , the torque transmission series 31 includes a plurality of torque transmission short joints 311 connected in sequence from top to bottom. The transmission sub-sections 311 are connected rotatably through the variable-angle force transmission structure 312, that is, the torque transmission series 31 has a hinged structure, and the torque transmission sub-section 311 located at the bottom is connected to the bearing body 21. The drill bit 1 is structured to break the rock, and the pressure-bearing hose 32 can bear the axial force. Therefore, the torque transmission short section 311 can transmit the torque that drives the drill bit 1 to rotate.

Further, the length of the torque transmission sub-sections 311 is less than or equal to 5 times the diameter of the bearing body 21, and the deflection limit between any torque transmission sub-sections 311 is more than 2°, so as to fully ensure that the torque transmission sub-sections 311 in series have sufficient Flexible.

Further, the length of the torque transmission short joint 311 is 30%˜300% of the diameter of the bearing body 21 .

Further, the variable-angle force transmission structure 312 includes a universal joint and a sleeve sleeved on the outside of the universal joint. There is a gap between the sleeve and the universal joint to form a deflection space, and the universal energy saving is relative to the sleeve in the deflection space. The axis is deflected by 0.5° to 15°, and the deflection angle of the universal joint is limited by the sleeve, which can prevent the variable angle force transmission structure 312 from excessively buckling during the WOB torque transmission process, hindering the WOB torque transmission, so that the WOB torque can be smoothly transfer.

Alternatively, the variable-angle force transmission structure 312 includes a ball seat 3124 and a ball head 3123, one of the ball head 3123 and the ball seat 3124 is provided with a torque transmission groove 3125, and the other of the ball head 3123 and the ball seat 3124 is provided with a torque A transmission pin 3126, the torque transmission pin 3126 is rotatably accommodated in the torque transmission groove 3125 to transmit torque, and a sealing member 3127 is provided between the torque transmission pin 3126 and the torque transmission groove 3125, and the sealing member 3127 can block the annular space The drilling fluid is channeled with the drilling fluid inside the flexible drill string 3 .

In an embodiment of the present invention, as shown in FIGS. 6 and 7 , the pressure-bearing hose 32 is a composite material pipe, a rubber pipe or a slotted tube, wherein when the torque transmission series 31 is a slotted tube, the The slits of the seam tube are filled with sealing material.

Further, as shown in FIG. 8 , when reverse circulation drilling is adopted, the propulsion mechanism 4 is the packing ring 22 , the outer diameter of the packing ring is 90% to 110% of the outer diameter of the drill bit 1 , and the packing ring 22 can be connected with the well. The inner wall surface of the borehole is in contact with or maintains a preset (smaller) gap, and the drilling circulating medium passes through the rotary steerable drilling tool and the borehole wall annulus, passes through the packing ring 22, and further passes through the internal through flow channel 33 of the flexible drill string 3 return.

It should be noted that the packing ring 22 includes a rubber ring to achieve close contact between the packing ring and the well wall; during reverse circulation drilling, since the packing ring 22 occupies the annular space between the rotary steerable drilling tool and the well wall , when the drilling circulating medium flows through the packing ring 22, a large resistance will be generated, and the aforementioned resistance will generate a large throttling pressure difference between the upper end and the lower end of the packing ring 22, and the throttling pressure difference will drive the drill bit 1 forward . In this embodiment, the packing ring 22 is sleeved on the outer side of the bearing body 21. As a better choice, a centralizing bearing is arranged between the packing ring 22 and the bearing body 21, so that the packing ring can not rotate to guide the drilling tool Rotation is used to reduce wear of the packing ring 22 .

In an embodiment of the present invention, as shown in FIG. 2 and FIG. 4 , a diameter-gauge structure 212 is connected to the outside of the bearing body 21 , and the gauge-gauge structure 212 includes a scraper blade or a centralizer. The size of the scraper blade should be It is basically equivalent to the size of the front blade 11. In small-sized wellbore, it can also ensure that the flexible drill string 3 can smoothly pass through the short-very short-radius wellbore, and complete the deep drilling of the extended well section; the centralizer can be used as a rotary steering process. The effective fulcrum of the guide ensures the stable shape of the guide.

In an embodiment of the present invention, as shown in FIG. 2 and FIG. 4 , the guide mechanism 211 includes at least three accommodating cavities 2111 arranged on the bearing body 21 at intervals along the circumferential direction of the bearing body 21 , preferably, The accommodating chambers 2111 are arranged at equal intervals. The accommodating chambers 2111 are provided with driving pistons 2112 that can expand and contract along the radial direction of the bearing body 21. The driving pistons 2112 can abut against the well wall. Specifically, the driving pistons 2112 can directly abut against the well. The wall can also be indirectly abutted against the well wall through the pushing member, and the expansion and contraction of the driving piston 2112 can drive the bearing body 21 to deflect in a preset direction. The thrust force exerted by the wall, the well wall will act on the bearing body 21 through the driving piston 2112, so that the bearing body 21 drives the drill bit 1 to deflect a certain angle relative to the well wall, thereby changing the wellbore trajectory.

Further, the electric drive actuator 5 includes a motor 51 and a rotary valve 52, the rotary valve 52 includes a rotary valve disc 521 and a rotary valve seat 522, the rotary valve seat 522 is fixedly connected with the bearing body 21, and the rotary valve seat 522 is provided with There are a plurality of communication holes corresponding to each accommodating cavity 2111 one-to-one. The rotary valve disc 521 is electrically connected to the motor 51, and the motor 51 can drive the rotary valve disc 521 to rotate relative to the rotary valve seat 522, so that the rotary valve seat 522 Each through hole above periodically supplies high-pressure drilling fluid to each corresponding accommodating cavity 2111, so that the driving piston 2112 periodically generates thrust.

In an embodiment of the present invention, as shown in FIG. 9 , when laterally drilling a lateral well inside the wellbore, the rotary steerable drilling tool further includes a driving drill string 6 , and the driving drill string 6 drives the rotary steerable drilling tool to rotate Drilling, the rotary steerable drilling tool is supported by the deflector 7, and is diverted from the main wellbore to enter the branch wellbore. An anchoring device 8 is arranged below the deflector 7, and the anchoring device 8 can be connected with the inner wall surface of the wellbore , prevent the oblique device 7 from slipping, the driving drill string 6 is connected with the upper end of the flexible drill string 3, the driving drill string 6 can transmit the drilling power to the drill bit 1 through the flexible drill string 3, and the specific structure of the driving drill string 6 is the prior art , and will not be repeated here.

In an embodiment of the present invention, as shown in FIG. 1 and FIG. 3 , the rotary steerable drilling tool further includes a control sub 9, which is connected between the steering section 2 and the flexible drill string 3, or controls The short joint 9 is connected to any position in the flexible drill string 3, or, the control short joint 9 is connected to the upper end of the flexible drill string 3. Since the advancement of the flexible drill string 3 is assisted by the propulsion device, the diameter of the rotary steerable drilling tool should be less than 0.1016 m, therefore, it is inconvenient for the control sub joint 9 to enter the lateral wellbore F with the rotary steerable drilling tool, and the advantage of the present invention is that during the construction process, the control sub joint 9 does not need to enter the lateral wellbore F, so there is no need to consider Control and control the flexibility of the short section 9; the control short section 9 is provided with a control circuit 91, and the control circuit 91 is electrically connected to the electric drive actuator 5 through the jumper line 92 to control the drive guide mechanism 211 of the electric drive actuator 5 to achieve rotation guide function.

Further, the rotary steerable drilling tool also includes a downhole power supply 10, which is connected to the upper end of the flexible drill string 3, and is electrically connected to the control circuit 91. The downhole power supply 10 can be driven by a downhole turbine to generate electricity, or can be driven by a downhole turbine. The downhole screw drives the downhole generator to generate electricity, or the downhole battery directly supplies electricity. The above-mentioned ways of generating electricity all need to take up a lot of space. Therefore, in the present invention, the downhole power supply 10 is arranged above the flexible drill string 3. During the construction process, the downhole The power source 10 does not enter the lateral wellbore F, so that the flexibility of the downhole power source 10 is not considered, and can well supply power to the flexible drill string 3 and/or the electric drive actuator 5 in the carrying body 21 .

It should be noted that the method for realizing sidetracking of an extremely short-radius lateral well from any position of the main wellbore Z is the prior art. 7 The angle between the guiding slope and the Z axis of the main wellbore can guide the wellbore trajectory of the very short radius well section to a certain extent. However, after completing the ultra-short-radius lateral sidetracking, in order to achieve maximum contact with the formation, it is necessary to continue to complete the extended well section of the ultra-short-radius lateral well section. The extended displacement of the extended well section and the accuracy of the wellbore trajectory directly determine the Economic benefits of very short radius lateral wells (including very short radius well sections and their extended well sections). Therefore, the main purpose of the present invention is to solve the wellbore trajectory control problem of the extended well section of the extremely short radius branched well section, but it does not mean that the content of the present invention is only applicable to the extended well section of the extremely short radius branched well section.

To sum up, in the rotary steerable drilling tool of the present invention, by setting the steering mechanism, the steering mechanism can drive the drill bit to deflect in a preset direction under the condition of rotation, so as to change the wellbore trajectory, thereby realizing short-radius directional drilling; The propulsion mechanism is provided, which can well assist the flexible drill string to advance or push the drill bit to drill, so as to realize small-diameter and short-radius steerable drilling with a certain extension length of the wellbore.

The above descriptions are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims

A rotary steerable drilling tool, wherein the rotary steerable drilling tool comprises:

drill;

a guide section, which includes a bearing body, the drill bit is connected to the lower part of the bearing body, and a guiding mechanism is connected to the bearing body;

A flexible drill string, which includes a torque transmission string and a pressure-bearing hose, the torque transmission string is passed through the inside of the pressure-bearing hose, or the pressure-bearing hose is passed through the torque transmission string Inside the row, the lower end of the torque transmission series is connected to the upper end of the bearing body;

a propulsion mechanism, which is connected to the carrying body and communicated with the flexible drill string, and the propulsion mechanism can drive the drill bit to drill or pull the flexible drill string to advance;

An electric drive actuator is electrically connected with the guide mechanism, and the electric drive actuator can control the action of the guide mechanism.
The rotary steerable drilling tool of claim 1, wherein:

The propulsion mechanism includes at least two counter-nozzles arranged at intervals along the circumferential direction of the carrying body, and the inlets of the counter-nozzles are communicated with the internal through-flow channel of the flexible drill string.
The rotary steerable drilling tool of claim 1, wherein:

The propulsion mechanism includes a drainage nozzle and a closed structure, the closed structure has a throat, the drainage nozzle is arranged at the lower part of the throat, and the throat passes through the drainage nozzle and the interior of the flexible drill string. The through-flow channel is connected.
The rotary steerable drilling tool of claim 1, wherein:

The torque transmission series includes a plurality of torque transmission sub-sections connected in sequence from top to bottom, and two adjacent torque transmission sub-sections are rotatably connected through a variable-angle force transmission structure, and the torque transmission sub-sections located at the bottom are rotatably connected. The transfer sub is connected with the carrying body.
The rotary steerable drilling tool of claim 4, wherein:

The deflection limit between any of the torque transfer pup joints is 2° or more.
The rotary steerable drilling tool of claim 4, wherein:

The length of the torque transfer pup is less than or equal to 5 times the diameter of the carrier body.
The rotary steerable drilling tool of claim 4, wherein:

The length of the torque transmission pup is 30% to 300% of the diameter of the bearing body.
The rotary steerable drilling tool of claim 4, wherein:

The variable-angle force transmission structure includes a universal joint and a sleeve sleeved on the outside of the universal joint. There is a gap between the sleeve and the universal joint to form a deflection space. The deflection space is deflected by 0.5°˜15° relative to the axis of the sleeve.
The rotary steerable drilling tool of claim 4, wherein:

The variable-angle force transmission structure includes a ball seat and a ball head, one of the ball head and the ball seat is provided with a torque transmission groove, and the other one of the ball head and the ball seat is provided with a torque A transmission pin is rotatably accommodated in the torque transmission groove.
The rotary steerable drilling tool of claim 1, wherein:

The pressure-bearing hose is a composite material pipe, a rubber pipe or a slit pipe filled with sealing material in the slit.
The rotary steerable drilling tool of claim 1, wherein:

The outside of the bearing body is connected with a gauge-gauge structure, and the gauge-gauge structure includes a scraper blade or a centralizer.
The rotary steerable drilling tool of claim 1, wherein:

The guide mechanism includes at least three accommodating cavities arranged on the bearing body at intervals along the circumferential direction of the bearing body, and a drive piston capable of expanding and contracting in the radial direction of the bearing body is arranged in the accommodating cavities , the driving piston can abut against the well wall, and the expansion and contraction of the driving piston can drive the bearing body to deflect in a preset direction.
The rotary steerable drilling tool of claim 12, wherein:

The electric drive actuator includes a motor and a rotary valve, the rotary valve includes a rotary valve disc and a rotary valve seat, the rotary valve seat is fixedly connected with the bearing body, and the rotary valve seat is provided with multiple There are communication holes corresponding to each of the accommodating chambers one-to-one, the rotary valve disc is electrically connected to the motor, and the motor can drive the rotary valve disc to rotate relative to the rotary valve seat.
The rotary steerable drilling tool of claim 1, wherein:

When reverse circulation drilling is used, the propulsion mechanism is a packing ring, the outer diameter of the packing ring is 90% to 110% of the outer diameter of the drill bit, and the packing ring can be in contact with the inner wall surface of the wellbore Fit or maintain preset gaps.
The rotary steerable drilling tool of any one of claims 1 to 14, wherein,

The rotary steerable drilling tool further includes a control sub-section, the control sub-section is connected between the steering section and the flexible drill string, or the control sub-section is connected to any position in the flexible drill string, Alternatively, the control sub-section is connected to the upper end of the flexible drill string, a control circuit is arranged in the control sub-section, and the control circuit is electrically connected to the electric drive actuator through a jumper line.
The rotary steerable drilling tool of claim 15, wherein:

The rotary steerable drilling tool further includes a downhole power source, the downhole power source is connected to the upper end of the flexible drill string, and the downhole power source is electrically connected to the control circuit.