WO2020244629A1

WO2020244629A1 - Rotary guide device

Info

Publication number: WO2020244629A1
Application number: PCT/CN2020/094661
Authority: WO
Inventors: 徐梓辰; 万晓跃
Original assignee: 万晓跃
Priority date: 2019-06-06
Filing date: 2020-06-05
Publication date: 2020-12-10
Also published as: CN112127809A; CN212508131U

Abstract

A rotary guide device, which comprises a rotary guide sub (1) and at least one set of universal drill pressure transfer subs (2). The rotary guide sub (1) at least comprises a mandrel (11), a guide sleeve (12), and a deflection control assembly (13) comprising an abutment element (121); the universal drill pressure transfer sub (2) is connected to the upper end of the rotary guide sub (1); the universal drill pressure transfer sub (2) comprises a universal joint (21); the deflection control assembly (13) can drive the guide sleeve (12) and the mandrel (11) to rotate around the center of the universal joint (21). The rotary guide sub (1) can easily generate a rotation angle, can achieve a high build rate, can reduce the working load of rotary guide, and can reduce wear in rotary guide.

Description

Rotating guide

Related application

This application claims the priority of the Chinese invention patent with the patent application number 201910491504.0 and the invention title "Rotary Guide Device".

Technical field

The present invention relates to the technical field of oil exploitation and drilling, in particular to a rotary steering device.

Background technique

The current push-type rotary steering drilling tools generally rely on the first centralizer to achieve centering close to the drill bit, and a flexible section is set behind the first centralizer, that is, a drill string with significantly lower stiffness than the rotary steering pup joint. During drilling, the flexible joint can be flexed, so that the rotary steering has certain steering flexibility. However, due to the rigidity of the flexible joint itself, most of the thrust force is offset, which causes the rotary steering device to not work well and is flexible. The bending moment generated by the joint itself is likely to cause wear of the bearing between the center mandrel and the guide sleeve. In order to increase the build rate and reduce the wear of the bearing, the existing technology is realized by extending the flexible joint, but the continuous growth of the flexible joint will bring about Drill string buckling problems, drill string vibration problems.

Summary of the invention

The purpose of the present invention is to provide a rotary guide device that can easily achieve tilting without the need for flexible joints.

To achieve the above objective, the present invention provides a rotary guide device, which includes:

Rotational guide pup joint, which at least includes a central mandrel, a guide sleeve sleeved on the outside of the central mandrel, and a deflection control assembly arranged on the guide sleeve, the deflection control assembly including a well capable of abutting Wall pusher;

At least one universal weight-on-bit transmission sub-joint, the universal weight-on-bit transmission sub-joint is connected above the rotary steering sub-joint, the universal weight-on-bit transmission sub-joint includes at least a universal joint, and the deflection control assembly The guide sleeve and the center shaft can be driven to rotate around the center of the universal joint.

Compared with the prior art, the advantages of the present invention are as follows:

The rotary guide device of the present invention does not need to be provided with a flexible joint, and the guide sleeve and the central shaft are driven to rotate around the center of the universal joint through the deflection control assembly, so that the rotary guide device can easily generate a rotation angle and can achieve the purpose of increasing the slope rate , While reducing the working load of the rotating guide and reducing the wear of the rotating guide;

The rotation guide device of the present invention drives the deflection control assembly to act through the cooperation of the hydraulic system and the electric system, so that the deflection control assembly drives the guide sleeve and the central shaft to rotate around the center of the universal joint. The operation is simple and convenient, saving time and effort;

The rotary steering device of the present invention avoids the uncontrollable problem of the short pitch of the rotary steering by setting the rotation angle sensor, thereby ensuring the precise control of the well trajectory;

The rotary steering device of the present invention can stabilize the drill string by providing a damping device, and prevent the sloshing of the rotary steering device in the wellbore from causing the drilling tool to bend and further damage the universal joint and affect the WOB torque The reason for the damping effect of the damping device is that when the drill string is affected by vibration, the vibration will cause the drill string to shake, and there is a tendency to drive the universal joint to produce a larger angle; the elasticity contained in the damping device Under the action of the rod or elastic tube, the WOB torque input end of the universal joint and the WOB torque output end of the universal joint are coaxial, and the drilling fluid in the fluid-filled wellbore will hinder drilling in any of the above processes. The sloshing of the string will eventually consume the energy of the drill string vibration;

The rotation guide device of the present invention is provided with an inner support, and the movable gap between the second end of the inner support and the bearing shell is used to limit the rotation range of the universal joint. The contact between them realizes the limit of the rotation of the universal joint.

Description of the drawings

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of the three-dimensional structure of the rotation guide device of the present invention;

2 is a schematic sectional view of the structure of the rotary guide device shown in FIG. 1;

Fig. 3 is another schematic sectional view of the rotating guide device;

Figure 4 is a schematic structural diagram of the hydraulic system communicating with the cylinder.

Description with icon number:

1. Rotating guide short section;

11. Center shaft; 111, lower centering bearing; 112, lower thrust bearing; 113, upper centering bearing; 114, upper thrust bearing; 115, connector;

12. Guide sleeve; 121. Liquid return storage chamber; 122. Power containing chamber; 13. Deflection control assembly; 131. Pushing member; 132. Drive hydraulic cylinder; 1321. Cylinder barrel; 1322. Drive piston; 133. Hydraulic system; 1331, electric motor; 1332, hydraulic pump; 1333, power fluid pipeline; 1334, return fluid pipeline;

14. Power system; 141, electromagnetic coupler; 1411, energy output terminal; 1412, energy receiving terminal; 142, hydraulic control circuit; 143, electrical connector; 144, cable;

15. Attitude measurement system;

2. Universal WOB transmission short joint;

21. Universal joint; 211. Axial through hole;

22. Fixed sleeve; 221. Centralizer; 222. Displacement sensor;

23. Drill collar short section; 231. Inverter circuit;

24. Inner support;

25. Damping device.

Detailed ways

In order to have a clearer understanding of the technical solutions, objectives and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings.

As shown in Figs. 1 and 2, the present invention provides a rotary steering device for drilling. The rotary steering device includes a rotary steering sub 1 and at least one universal WOB transmission sub 2, wherein:

The rotary guide sub 1 includes at least a central mandrel 11, a guide sleeve 12 sleeved on the outside of the central mandrel 11, and a deflection control assembly 13 arranged on the guide sleeve 12. The deflection control assembly 13 includes a shaft that can abut against the well wall Specifically, the lower part of the central mandrel 11 and the guide sleeve 12 are connected by a lower centering bearing 111 and a lower thrust bearing 112, and the lower part of the central mandrel 11 is screwed with a connector 115, of course , The connecting head 115 can also be made integrally with the central shaft 11, the connecting head 115 can be connected with the drill bit, the lower outer peripheral surface of the connecting head 115 is provided with an annular protrusion, and the lower end of the guide sleeve 12 can pass through the lower thrust bearing 112 and The annular convex abutment of the connecting head 115 means that the connecting head 115 limits the guide sleeve 12 to prevent the guide sleeve 12 from being separated from the central shaft 11, between the upper part of the connecting head 115 and the guide sleeve 12 The upper centering bearing 113 and the upper thrust bearing 114 are connected, so that the center shaft 11 and the connecting head 115 can smoothly rotate relative to the guide sleeve 12, and the deflection control assembly 13 is located at the lower part of the guide sleeve 12 and adjacent to the connecting head 115 ；

The universal weight-on-bit transmission sub-joint 2 is connected to the top of the rotary steering sub-joint 1. The universal weight-on-bit transmission sub-joint 2 includes at least a universal joint 21. The universal joint 21 can transmit weight-on-bit and torque at the same time. The deflection control assembly 13 can The guide sleeve 12 and the central shaft 11 are driven to rotate around the center of the universal joint 21. Specifically, the pusher 131 of the deflection control assembly 13 can apply outward (away from the axial direction of the central shaft 11) to the guide sleeve 12 ) To make the guide sleeve 12 and the central mandrel 11 rotate around the center of the universal joint 21 to achieve the purpose of changing the wellbore trajectory. When the rotary steering device has multiple sets of universal WOB transmission sub-joints 2, multiple sets The universal WOB transmission sub-joint 2 is sequentially connected to the upper end of the rotary guide sub-joint 1 from top to bottom. The guide sleeve 12 and the central mandrel 11 rotate around the universal joint 21 adjacent to the guide sleeve 12. Normally, it is preferred Only one universal WOB transmission sub 2 is provided, and the universal WOB transmission sub 2 includes only one universal joint 21. Of course, the universal WOB transmission sub 2 may include multiple universal joints 21. In this embodiment, only one universal joint for weight-on-bit transmission 2 is included, and the universal joint for weight-on-bit transmission 2 only includes one universal joint 21 for description.

Among them, the maximum tensile force of the universal joint 21 is not less than 30 tons, the maximum torque that the universal joint 21 can withstand is not less than 600 N/m, and the maximum WOB that the universal joint 21 can withstand is not less than 3 tons.

In addition, the universal joint 21 adjacent to the guide sleeve 12 is arranged within a range of 1.8 meters above the upper centralizing bearing; the arrangement of the universal joint 21 allows the guide sleeve 12 to easily push the center shaft 11 so that the guide sleeve 12 The central mandrel 11 easily rotates around the universal joint 21 to realize the rotary guiding function, which reduces the friction of the bearing, makes the guide sleeve not easily driven by the central mandrel, and makes the working state of the guide sleeve more stable. It has been verified by many tests that the setting of the universal WOB transmission sub-joint 2 effectively reduces the probability that the central mandrel 11 drives the guide sleeve 12 to suddenly rotate; and effectively improves the service life of the bearing. In the limit test, the bearing The lifespan of the car is increased from 313 hours to 720 hours.

The central axis, steering executive sleeve, and flexible section are essential components for realizing static offset rotary steering drilling. According to the technical characteristics of the rotation guide, the deflection control assembly in the guide execution sleeve consumes a large amount of electric energy to bend the flexible section. In the current technology, the energy supply subsystem is generally a turbine generator. The turbine generator and the rotary steering system are connected by a flexible drill rod with a small diameter. Under this connection mode, the flexible drill rod cannot perform well on the central shaft and the guide set on the outside of it. The sleeve rotates relative to the rear drill string, which requires a large amount of electricity. Therefore, the inventor proposes to arrange the universal joint behind the central axis to give the mechanical structure of the universal joint the functions of power transmission and high-pressure fluid transmission, and use it in the special engineering environment of drilling conditions to make the guide sleeve The guide execution sub-joint formed by the barrel and its central core shaft can rotate around the universal joint, realize the rotary guide function, reduce the power consumption of the rotary guide device, and improve the performance of the rotary guide device.

The rotary guide device provided by the present invention does not need to be provided with a flexible joint, and the guide sleeve 12 and the central shaft 11 are driven to rotate around the center of the universal joint 21 through the deflection control assembly 13, so that the rotary guide device can easily generate a turning angle and can achieve The purpose of increasing the build rate.

Further, due to the setting of the universal WOB transmission sub-joint 2, the frictional force at the upper centralizing bearing 113 and the lower centralizing bearing 111 can be reduced, so the centralizing length of the two centralizing bearings can be greatly shortened, so that the centralizing length of the upper centralizing bearing 113 (That is, the length along the axial direction of the central mandrel 11) is 0.4 times or less of the diameter of the guide sleeve 12, and the righting degree of the lower centralizing bearing 111 is 0.6 times or less of the diameter of the guide sleeve 12.

Further, as shown in FIG. 2, the deflection control assembly 13 includes at least one set of driving members, and the driving members include at least three sets of driving hydraulic cylinders 132 arranged at intervals along the radial direction of the central mandrel 11. Preferably, each driving hydraulic cylinder 132, etc. Arranged at intervals, the driving hydraulic cylinder 132 includes a cylinder tube 1321 connected to the side wall of the guide sleeve 12 and a driving piston 1322 arranged in the cylinder tube 1321. The driving piston 1322 is connected with a pushing member 131, and the pushing member 131 is adjacent to The shaft wall is provided, the driving piston 1322 can drive the pushing member 131 to move toward the axis of the central shaft 11 or against the shaft wall, and the movement of the pushing member 131 can drive the central shaft 11 and the guide sleeve 12 around the universal joint 21 Center rotation. Specifically, when the wellbore trajectory needs to be adjusted, the driving piston 1322 is extended out of the cylinder 1321, that is, the driving piston 1322 is in an open state. At this time, all the driving pistons 1322 can drive the pusher 131 to push The shaft wall applies thrust to the guide sleeve 12. Because the thrust of the thrusting member 131 in different directions is different, the force of different directions and different magnitudes is generated, and the resultant direction of these forces points to the direction opposite to the guiding direction. This combined thrust, which is opposite to the guiding direction, will eventually push the central mandrel 11 and the guiding sleeve 12 to rotate around the center of the universal joint 21.

When the deflection control assembly 13 includes multiple sets of drive components, the multiple sets of drive assemblies may be arranged at intervals along the axial direction of the central shaft 11.

Of course, the pushing member 131 can also be integrally formed on the driving piston 1322, that is, the pushing member 131 is formed on the driving piston 1322, that is, the driving piston 1322 can push the well wall by itself.

Furthermore, in order to make the extension of the driving pistons 1322 simple and convenient, as shown in FIGS. 2 and 4, the deflection control assembly 13 also includes a hydraulic system 133, which includes a hydraulic pump 1332 connected with an electric motor 1331. The pipeline 1333 and the liquid return pipeline 1334, the cylinder wall of the guide sleeve 12 is provided with a power accommodating cavity 122 and a liquid return storage cavity 121, the electric motor 1331 and the hydraulic pump 1332 are arranged in the power accommodating cavity 122, each cylinder 1321 is in sealed communication with the hydraulic pump 1332 through the power fluid line 1333, and the power fluid line 1333 is connected to the fluid return storage chamber 121 through the fluid return line 1334. The hydraulic pump 1332 can provide power fluid for the driving piston 1322, and the driving piston 1322 extends When exiting the cylinder 1321, the electric motor 1331 drives the hydraulic pump 1332 to input pressure fluid to the cylinder 1321 through the power fluid line 1333 to push the driving piston 1322 out, so that the driving piston 1322 extends out of the cylinder 1321, and the pressure fluid in the power fluid line 1333 The liquid return pipeline 1334 flows into the liquid return storage chamber 121 for storage.

Among them, the specific locations of the power fluid pipeline and the liquid return pipeline are based on the prior art, and those skilled in the art can set the power fluid pipeline and the liquid return pipeline at an appropriate position to meet the requirements of each cylinder 1321 passing through the power fluid pipe. The circuit is in sealed communication with the hydraulic pump 1332, and the power fluid pipeline is in communication with the return liquid storage chamber 121 through the return liquid pipeline.

Furthermore, the hydraulic system further includes a hydraulic control circuit 142 which is arranged on the side wall of the guide sleeve 12.

It should be supplemented that under the condition of the same build rate, the setting of the universal WOB transmission sub-joint can effectively reduce the workload of the hydraulic system.

Further, the distance between the universal joint 21 adjacent to the guide sleeve 12 and the geometric center of the guide sleeve 12 is less than or equal to 2.5 m, that is, the universal joint 21 adjacent to the guide sleeve 12 is disposed on the upper end surface of the guide sleeve 12 Within the range of 1.5 meters above, so that the rotary guide device can easily generate a corner, the distance between the universal joint 21 adjacent to the guide sleeve 12 and the lower end of the rotary guide sub-joint 1 is less than or equal to 4m, so that the center shaft 11 and the guide sleeve 12 can smoothly rotate around the center of the universal joint 21 to achieve the purpose of changing the wellbore trajectory.

Further, the universal joint 21 is a cross-axis universal joint, a ball-cage type universal joint, a ball fork type universal joint, or a ball-hinge universal joint.

Further, in order to control the wellbore trajectory more accurately, as shown in FIG. 2, the rotary steering device further includes an attitude measurement system 15. The attitude measurement system 15 is located below the universal joint 21, and the attitude measurement system 15 includes at least one acceleration The angle of the included angle between the center line of the accelerometer and the axis of the guide sleeve 12 is 0°-60°. The inclination angle of the high-deviation rotation guide is measured by the accelerometer. The specific measurement method is the prior art. I won't repeat it again.

Further, a centralizer is connected above the guide sleeve 12, and the centralizer is arranged on the outside of the central core shaft 11, and the distance between the centralizer and the universal joint adjacent to the guide sleeve is less than or equal to 2 m.

In an embodiment of the present invention, as shown in FIG. 2, the universal weight-on-bit transmission sub-joint 2 further includes a fixed sleeve 22 sleeved outside the universal joint 21, and the outer peripheral surface of the fixed sleeve 22 can be The inner surface of the wall fits, the lower end of the fixed sleeve 22 is connected with the central mandrel 11, there is a gap between the fixed sleeve 22 and the universal joint 21 to form a deflection space, and the universal joint 21 can be relatively fixed in the deflection space The axis of the sleeve 22 is deflected by 0°-5°, that is, the side of the universal joint 21 that is connected to the rotary guide sub-joint 1 can only be deflected by 0°-5° relative to the other side of the universal joint 21. The barrel 22 restricts the deflection angle of the universal joint 21, thereby restricting the rotation angle of the rotation guide sub 1.

Furthermore, the universal joint 21 can deflect 0.5°-3° relative to the axis of the fixed sleeve 22 in the deflection space.

Still further, as shown in FIG. 3, the rotary steering device further includes an inner support 24, which is disposed in the load-on-bit torque output end and/or the load-on-bit torque input end of the universal joint 21 in the load-bearing housing. The first end of 24 is connected to the universal joint 21, and there is a movable gap between the second end of the inner support 24 and the WOB torque output end of the universal joint 21 and/or the inner wall of the load-bearing housing of the WOB torque input end , The distance between the pushing member 131 and the universal joint 21 is the first distance, the arm length of the inner support 24 is greater than 5% of the first distance, the movable gap is used to limit the rotation range of the universal joint 21, and the inner support The contact between the second end of the piece 24 and the bearing shell realizes the restriction on the rotation of the universal joint 21.

Among them, the moment arm of the inner support 24 is: in the limit state, the distance from the most distal contact point of the inner support 24 and the inner wall of the bearing shell to the center of the universal joint 21; the WOB torque output of the universal joint 21 The end is the part used for drilling under the universal joint 21, such as the rotary steering sub-joint 1, the bearing shell is the steering sleeve 12, and the WOB torque input end of the universal joint 21 is the upper part of the universal joint 21. For any component of the drill string that transmits the weight-on-bit torque, such as the drill collar sub 23 above the universal joint 21, the bearing shell is the side wall of the drill collar sub 23.

In an example of this embodiment, as shown in FIG. 2, a centralizer 221 is sleeved on the outside of the fixed sleeve 22, and the inner surface of the centralizer 221 is connected to the outer peripheral surface of the fixed sleeve 22 in a sealed manner. The outer peripheral surface is in contact with the well wall, and the arrangement of the centralizer 221 effectively limits the displacement of the fixed sleeve 22, thereby ensuring the stability of the deflection space formed between the fixed sleeve 22 and the universal joint 21.

Further, the distance between the centralizer 221 adjacent to the guide sleeve and the universal joint 21 adjacent to the guide sleeve is less than or equal to 2 m. Specifically, the centralizer 221 adjacent to the guide sleeve is located adjacent to the universal joint 21 of the guide sleeve. The centralizer 221 adjacent to the guide sleeve is arranged within a range of no more than 2 meters below the universal joint 21 adjacent to the guide sleeve, so that the universal joint 21 and the rotating guide sub One side of the joint can be smoothly rotated relative to the other side of the universal joint 21. Preferably, the distance between the centralizer 221 adjacent to the guide sleeve and the universal joint 21 adjacent to the guide sleeve is less than or equal to 1 m.

Furthermore, the centralizer 221 is screwed to the outer wall of the fixed sleeve 22. Specifically, the outer peripheral surface of the fixed sleeve 22 is provided with an external thread, and the inner surface of the centralizer 221 is provided with an internal thread. The centralizer 221 is connected with the fixed sleeve 22, and the threaded connection is simple and convenient, which facilitates the disassembly and installation of the centralizer 221.

Alternatively, the centralizer 221 and the fixed sleeve 22 are an integrated structure, that is, the centralizer 221 and the fixed sleeve 22 are made integrally, which effectively ensures the reliability of the connection between the centralizer 221 and the fixed sleeve 22.

Furthermore, under the existing technical conditions, the trajectory of the wellbore formed by the rotary steering mainly driven by pushing is greatly affected by the formation. Therefore, the problem of monitoring the trajectory of such rotary steering mainly by pushing has been plagued by the problem. Drilling engineering operators, in the current technology, the method of installing an accelerometer 1-2 meters near the drill bit of this type of rotation can measure a more accurate deviation angle. However, for the magnetometer, due to the drill bit and electrical equipment In order to solve the above problems, the rotation guide device also includes a rotation angle sensor, which includes a displacement sensor arranged between the central shaft 11 and the fixed sleeve 22 222. The real-time monitoring of the near-bit borehole curvature and steering direction of the universal joint by the displacement sensor 222 can calculate the wellbore curvature, that is, the wellbore curvature can be calculated by monitoring the rotation angle of the universal joint 21 by monitoring means.

Preferably, considering the actual drilling conditions, as few moving parts as possible should be used to detect the rotation of the universal joint. Therefore, the displacement sensor 222 is an acoustic sensor, that is, the ultrasonic monitoring method is used to monitor the current transmission and overcurrent. The direction of rotation of the joint 21 is monitored; that is, the calculation device obtains the distance between the fixed sleeve 22 and the central shaft 11 by measuring the time difference of the reflected wave of the ultrasonic wave, and uses the inverse trigonometric function to convert the distance into a universal Corner of section 21.

In an embodiment of the invention, as shown in Figs. 1 and 2, the universal WOB transmission stub 2 further includes a drill collar stub 23 connected to the universal joint 21, and the fixed sleeve 22 extends to the drill collar On the outside of the short section 23, the drill collar short section 23 can be connected with the universal joint 21 of another universal WOB transmission short section 2, or can be connected with other downhole tools, so that each universal WOB transmission short section The connection between 2 and the connection between the universal WOB transfer sub 2 and other downhole tools becomes simple and convenient.

Further, the drill collar short section 23 is provided with a drill collar short throttle channel inside, and the universal joint 21 is provided with a universal joint flow channel communicating with the drill collar short throttle channel, specifically, in the universal joint 21 An axial through hole 211 communicating with the inside of the central mandrel 11 is provided, and the axial through hole 211 forms a universal throttle passage through which drilling fluid can flow into the central mandrel 11.

Further, an energy transmission line is provided in the universal joint 21. Preferably, the energy transmission line is a cable 144. Of course, the energy transmission line may also be a hydraulic pipeline.

Further, the rotation steering device further includes a power system 14 that includes an energy supply system (not shown in the figure), an inverter circuit 231, an electromagnetic coupler 141, and a rectifier circuit. The rectifier circuit is an existing The technology will not be repeated here. The rectifier circuit, the hydraulic control circuit 142 and the attitude measurement system 15 are all arranged on the side wall of the guide sleeve 12 in the axial direction. The energy supply system is arranged above the universal joint 21. The energy supply system It can be a smart drill pipe, a downhole turbine generator or a downhole battery pack and other instruments and equipment. These instruments and equipment are all existing technologies and will not be repeated here. The electromagnetic coupler 141 includes sleeves on the outer peripheral surface of the central mandrel 11 The energy output terminal 1411 is connected to the inner wall of the guide sleeve 12, and the energy receiving terminal 1412 is connected to the inner wall of the guide sleeve 12. The energy output terminal 1411 is electrically connected to the inverter circuit 231 through the cable 144, and the energy receiving terminal 1412 is electrically connected to the rectifier circuit. The circuit 142 is connected to the motor 1331 through the electrical connector 143, and the hydraulic control circuit 142 is electrically connected to the rectifier circuit to obtain electrical energy.

Specifically, the inverter circuit 231 can invert the DC power delivered by the turbine generator or other underground power sources into high-frequency AC power that can be used by the energy transmitting module, wherein the wireless energy transfer method and the specific working method of the rectifier circuit are based on the prior art , I won’t repeat it here.

When the middle mandrel 11 uses an electric slip ring or brush to provide energy to the sleeve 12, the inverter circuit 231 may not exist. Among them, the electric slip ring or the brush transfer energy method is the existing technology, and it is not here. Repeat.

In addition, in order to stabilize the voltage, a voltage stabilizing circuit can be installed between the energy receiving end 1412 and other circuits. The voltage stabilizing circuit is an existing technology and is not a necessary part of the guide sleeve, and will not be repeated here.

Furthermore, the inverter circuit 231 is provided in the drill collar sub 23.

In an embodiment of the present invention, as shown in FIG. 3, the rotation guide device further includes a damping device 25, which includes an elastic rod or tube, and both ends of the elastic rod or tube are connected to the universal joint 21. The weight-on-bit torque input end and the weight-on-bit torque output end are coaxially connected to stabilize the drill string and prevent the sway of the rotary steering device in the borehole from causing the drilling tool to bend and further damage the universal joint 21, affecting the drilling Transmission of pressure torque.

It should be noted that the WOB torque input end of the universal joint 21 is any component of the drill string above the universal joint 21 for transmitting the WOB torque, for example, the drill collar sub 23 above the universal joint 21, The output end of the weight-on-bit torque of the universal joint 21 is the rotary guide sub 1.

Of course, any other manners that can achieve coaxial connection with the WOB torque input end and the WOB torque output end of the universal joint are within the protection scope of the present invention.

In the embodiment shown in FIG. 3, an elastic rod is used as the damping device 25. Of course, the damping device 25 can also be any existing structure that has certain elasticity and can prevent the deflection of the universal joint 21. , I won’t repeat it here.

In summary, the rotation guide device of the present invention does not need to be provided with a flexible joint, and the guide sleeve and the central shaft are driven to rotate around the center of the universal joint through the deflection control assembly, so that the rotation guide device can easily generate a rotation angle, and can achieve The purpose of increasing the slope rate, while reducing the working load of the rotating guide and reducing the wear of the rotating guide;

The foregoing descriptions are merely illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person 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. Moreover, it should be noted that the various components of the present invention are not limited to the above-mentioned overall application. Each technical feature described in the specification of the present invention can be selected individually or used in combination with multiple selections according to actual needs. Therefore, the present invention Naturally, other combinations and specific applications related to the invention of this case are covered.

Claims

A rotary guide device, wherein the rotary guide device includes:

Rotational guide pup joint, which at least includes a central mandrel, a guide sleeve sleeved on the outside of the central mandrel, and a deflection control assembly arranged on the guide sleeve, the deflection control assembly including a well capable of abutting Wall pusher;

At least one universal weight-on-bit transmission sub-joint, the universal weight-on-bit transmission sub-joint is connected above the rotary steering sub-joint, the universal weight-on-bit transmission sub-joint includes at least a universal joint, the deflection control assembly The guide sleeve and the center shaft can be driven to rotate around the center of the universal joint.
The rotary guide device according to claim 1, wherein:

The universal WOB transmission sub-joint also includes a fixed sleeve sleeved on the outside of the universal joint, the lower end of the fixed sleeve is connected with the central shaft, and the fixed sleeve is connected to the universal joint. There is a gap between the joints to form a deflection space, and the universal energy saving is deflected by 0°-5° relative to the axis of the fixed sleeve in the deflection space.
The rotary guide device according to claim 2, wherein:

A centralizer is sheathed outside the fixed sleeve.
The rotary guide device according to claim 2, wherein:

The rotation guide device further includes a rotation angle sensor, and the rotation angle sensor includes a displacement sensor disposed between the central shaft and the fixed sleeve.
The rotary guide device according to claim 1, wherein:

The distance between the universal joint adjacent to the guide sleeve and the geometric center of the guide sleeve is less than or equal to 2.5 m; and the universal joint adjacent to the guide sleeve is shorter than the rotation guide The distance between the lower end faces of the nodes is less than or equal to 4m.
The rotary guide device according to claim 1, wherein:

A centralizer is connected above the guide sleeve, the centralizer is arranged on the outer side of the central shaft, and the distance between the centralizer and the universal joint adjacent to the guide sleeve is less than or equal to 2m.
The rotary guide device according to claim 1, wherein:

The upper end of the center mandrel is connected to the guide sleeve through an upper centering bearing, and the lower end of the center mandrel is connected to the guide sleeve through a lower centering bearing. The distance between the joint and the upper centralizing bearing is less than or equal to 1.8m.
The rotary guide device according to claim 1, wherein:

The universal weight-on-bit transmission sub-joint further includes a drill collar sub-joint connected to the universal joint. The drill collar sub-joint is provided with a drill collar short-section flow channel inside the universal joint. There is a universal throttle communicating with the drill collar short throttle.
The rotary guide device according to claim 8, wherein:

An energy transmission line is arranged inside the universal joint.
The rotary guide device according to claim 9, wherein:

The rotation guide device further includes a power system, the power system includes an energy supply system, an inverter circuit, an electromagnetic coupler, and a rectifier circuit, and the energy supply system is arranged at the universal joint adjacent to the guide sleeve. Above, the rectifier circuit is arranged in the side wall of the guide sleeve, and the electromagnetic coupler includes an energy output end sleeved on the outer peripheral surface of the central shaft, and an energy output end connected to the guide sleeve An energy receiving end on the inner wall surface, the energy output end is electrically connected to the inverter circuit through the energy transmission line, and the energy receiving end is electrically connected to the rectifier circuit.
The rotary guide device according to claim 10, wherein:

The inverter circuit is arranged in the drill collar short section.
The rotary guide device according to claim 1, wherein:

The universal joint is a cross shaft universal joint, a ball cage universal joint, a ball fork universal joint or a ball hinge universal joint.
The rotary guide device according to claim 1, wherein:

The rotation guide device further includes an attitude measurement system, the attitude measurement system is located below the universal joint, the attitude measurement system includes at least one accelerometer, the center line of the accelerometer and the guide sleeve The angle of the included angle between the axes is 0°-60°.
The rotation guide device according to any one of claims 1 to 13, wherein:

The deflection control assembly further includes at least one set of driving members, the driving members including at least three sets of driving hydraulic cylinders arranged at intervals along the radial direction of the central mandrel, and the driving hydraulic cylinders include connecting to the guide sleeve The cylinder on the side wall of the cylinder and the driving piston provided in the cylinder, the driving piston is connected with the pushing member, and the driving piston can drive the pushing member toward the center shaft The axis moves or abuts against the well wall, and the movement of the pushing member can drive the central shaft and the guide sleeve to rotate around the center of the universal joint.
The rotation guide device according to claim 14, wherein:

The deflection control assembly also includes a hydraulic system, the hydraulic system includes a hydraulic pump connected with an electric motor, a power fluid pipeline, and a liquid return pipeline. The side wall of the guide sleeve is provided with a power accommodation cavity and a liquid return. In the storage cavity, the electric motor and the hydraulic pump are arranged in the power accommodating cavity, each of the cylinders is in sealed communication with the hydraulic pump through the power fluid pipeline, and the power fluid pipeline passes through the The liquid return pipeline is communicated with the liquid return storage cavity.
The rotary guide device according to claim 1, wherein:

The rotary guide device further includes a damping device, the damping device includes an elastic rod or an elastic tube, and both ends of the elastic rod or the elastic tube are respectively connected to the WOB torque input end and the WOB torque of the universal joint. The output end is coaxially connected.
The rotary guide device according to claim 2, wherein:

The rotary steering device further includes an inner support, the inner support is arranged in the load-on-bit torque output end and/or the load-on-bit torque input end of the universal joint in the bearing housing, and the first end of the inner support Connected to the universal joint, there is a movable clearance between the second end of the inner support and the load-on-bit torque output end and/or the load-on-bit torque input end of the universal joint. The distance between the supporting member and the universal joint is a first distance, and the length of the arm of the inner support is greater than 5% of the first distance.
The rotation guide device according to claim 7, wherein:

The centralization length of the upper centralization bearing is 0.4 times or less of the diameter of the guide sleeve, and the centralization degree of the lower centralization bearing is less than 0.6 times the diameter of the guide sleeve.