An eccentric angle adjustment device and method for a rotary guide tool and related applications

Abstract

The present invention discloses a device, method, and related applications for adjusting the eccentric angle of a rotary guide tool. The adjustment device includes an eccentric shaft, an eccentric shaft inner sleeve, and a transition sub. The transition sub is provided with a first stepped hole, the eccentric shaft is disposed within the large diameter section of the first stepped hole, and the eccentric shaft is provided with a second stepped hole. The eccentric shaft inner sleeve is disposed within the large diameter section of the second stepped hole and is connected to the drill bit shaft. A spring is disposed between one end and the stepped surface of the first stepped hole, and a first meshing gear is disposed at the other end. A second meshing gear that mates with the first meshing gear is disposed on the stepped surface of the second stepped hole. The large diameter section of the second stepped hole and the eccentric shaft inner sleeve form an eccentric ring structure. The eccentric shaft inner sleeve is configured to rotate relative to the eccentric shaft under the action of an external force and compress the spring, and to reset under the action of the spring's restoring force. The meshing of the first meshing gear and the second meshing gear achieves circumferential positioning of the eccentric shaft inner sleeve. This allows adjustment of the tool's eccentric angle.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling, and in particular to a device and method for adjusting the eccentric angle of a rotary steering tool and related applications. Background Art

[0002] With the continuous development of drilling technology, horizontal wells, extended reach wells and other well types are gradually increasing, which are more conducive to achieving long well section crossing within a single well reservoir and drilling into multiple regional reservoirs, thereby improving the recovery rate of a single well. As a convenient, fast, high-speed and efficient steering tool, fully rotary steerable tools are widely used in horizontal wells and extended reach wells. The fully rotary drilling method not only reduces the time spent on directional drilling, but also reduces frictional resistance, making the wellbore trajectory smoother and reducing downhole risks. Due to the differences in formations and inclination requirements in the service well sections, if the eccentric angle of the rotary steerable tool can be adjusted in time according to the formation and inclination requirements to adapt to different formations and well deviation requirements, it will be possible to achieve fast, efficient and precise drilling.

[0003] Rotary drill bit directional steerable tools typically use an eccentric mechanism to achieve eccentric pointing. The eccentric angle determines the tool's ability to create deflections. A larger eccentric angle improves the deflection capability, but also increases the torque and resistance the tool experiences during eccentric drilling, requiring more power for pointing. Because the motor power required for pointing is limited, a larger eccentric angle is used in high-build-rate well sections to optimize motor performance. Measures such as reducing the weight on bit (WOB) are also taken to reduce the motor's output power. A smaller eccentric angle is used in low-build-rate or stable-deflection well sections to reduce the torque and rotational resistance caused by drill bit eccentricity, while also increasing WOB and other parameters, thereby boosting the mechanical penetration rate (ROP). Therefore, adjusting the tool's eccentric angle can better match the tool to the formation and drilling design, improving drilling efficiency and quality. However, existing eccentric mechanisms are generally non-adjustable, limiting the tool's eccentricity to a specific angle. Changing the tool's eccentricity requires replacing a rotary steerable tool with a different eccentric mechanism. Summary of the Invention

[0004] The non-adjustable structure of the eccentric mechanism in the prior art requires the adjustment of the tool eccentric angle by replacing a rotary guide tool with a different eccentric angle, which increases the difficulty of operation and the operation cycle; at the same time, tools of different specifications need to be processed to meet the requirements of different eccentric angles, which increases the processing and manufacturing cost of the tool.

[0005] In view of the above problems, the present invention is proposed to provide a device and method for adjusting the eccentric angle of a rotary guide tool and related applications that overcome the above problems or at least partially solve the above problems.

[0006] In a first aspect, an embodiment of the present invention provides an eccentric angle adjustment device for a rotary guide tool, comprising: an eccentric shaft, an eccentric shaft inner sleeve, and a transition nipple;

[0007] The transition sub is provided with a first stepped hole, the eccentric shaft is arranged in the large diameter section of the first stepped hole, and the eccentric shaft is provided with a second stepped hole;

[0008] The eccentric shaft inner sleeve is arranged in the large diameter section of the second stepped hole, and is used to be connected to the drill shaft of the rotary guide tool, and a spring is arranged between one end and the step surface of the first stepped hole, and a first meshing gear is arranged at the other end, and a second meshing gear that matches the first meshing gear is arranged on the step surface of the second stepped hole;

[0009] The large diameter section of the second step hole and the eccentric shaft inner sleeve form an eccentric ring structure; the eccentric shaft inner sleeve is used to rotate relative to the eccentric shaft and compress the spring under the action of external force, and to reset under the action of the restoring force of the spring, and to achieve circumferential limitation of the eccentric shaft inner sleeve through the engagement of the first meshing gear and the second meshing gear to achieve adjustment of the eccentric angle of the tool.

[0010] In an optional embodiment, a third meshing gear is circumferentially arranged on the outer wall of the eccentric shaft inner sleeve, and a first adjustment hole and a second adjustment hole are provided on the transition short section and the eccentric shaft, which are used to apply external force to the third meshing gear through the first adjustment hole and the second adjustment hole, so as to drive the eccentric shaft inner sleeve to rotate and compress the spring by turning the third meshing gear.

[0011] In an optional embodiment, the device further comprises: a toggle tool;

[0012] The lower end of the toggle tool is provided with a tool gear that cooperates with the third meshing gear. The lower end of the toggle tool is used to pass through the first adjustment hole and the second adjustment hole to cooperate with the third meshing gear, so as to provide external force for the rotation of the eccentric shaft inner sleeve by rotating the toggle tool.

[0013] In an optional embodiment, the eccentric shaft inner sleeve is provided with first angle indexing holes distributed along the circumferential direction, and the first angle indexing holes are provided with first indexing marks;

[0014] Correspondingly, a first observation hole and a second observation hole are further provided on the transition short section and the eccentric shaft for observing the first graduation mark of the first angle graduation hole.

[0015] In an optional embodiment, the eccentric shaft is provided with second angle indexing holes distributed along the circumferential direction, and the second angle indexing holes are provided with second indexing marks;

[0016] Correspondingly, the first observation hole on the transition sub is also used to observe the second graduation mark of the second angular graduation hole on the eccentric shaft during the rotation of the eccentric shaft.

[0017] In an optional embodiment, the number of the first angular indexing hole and the meshing teeth of the third meshing gear are set correspondingly, and the meshing teeth of the first angular indexing hole and the third meshing gear are evenly distributed along the circumferential direction of the eccentric shaft inner sleeve.

[0018] In an optional embodiment, the device further comprises: an observation hole screw plug and an adjustment hole screw plug, for respectively blocking the first observation hole and the first adjustment hole of the transition nipple;

[0019] The second observation hole and the second adjustment hole of the eccentric shaft are arranged at the location where the thickness of the eccentric ring of the eccentric shaft is the largest.

[0020] In an optional embodiment, the device further includes a locking screw, which is used to achieve the connection and fixation between the eccentric shaft and the eccentric shaft inner sleeve by locking the second observation hole of the eccentric shaft and the corresponding first angle graduation hole on the eccentric shaft inner sleeve.

[0021] In an optional embodiment, an annular positioning groove is provided on the outer wall of the eccentric shaft inner sleeve;

[0022] The annular positioning groove is used to achieve axial limitation of the eccentric ring inner sleeve by cooperating with the positioning piece passing through the first adjustment hole and the second adjustment hole when an external force is applied to the eccentric shaft inner sleeve to drive it to rotate.

[0023] In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a method for adjusting the eccentric angle of a rotary steering tool, which is implemented based on the above-mentioned eccentric angle adjustment device of the rotary steering tool, and includes:

[0024] The drill bit shaft of the rotary guide tool is installed in the eccentric shaft inner sleeve of the eccentric angle adjustment device through the ball sleeve and the spherical shaft sleeve;

[0025] Determine the target eccentricity angle of the rotary steerable tool based on the geological conditions of the target formation;

[0026] Determining a target rotation angle of the eccentric shaft inner sleeve based on a pre-established relationship between the eccentric angle of the tool and the rotation angle of the eccentric shaft inner sleeve of the adjustment device;

[0027] The inner sleeve of the eccentric shaft is rotated by the target rotation angle to adjust the eccentric angle of the tool.

[0028] In an optional embodiment, the method further comprises: determining a state where the maximum thickness of the eccentric shaft inner sleeve coincides with the maximum thickness of the eccentric shaft as an initial state of the eccentric angle adjustment device;

[0029] When the eccentric angle adjustment device is in the initial state, the relationship between the eccentric angle of the tool and the rotation angle of the eccentric shaft inner sleeve is constructed based on the following formula:

[0030]

[0031] Where θ is the current tool eccentric angle; A is the distance between the center of the eccentric shaft's outer diameter and the center of its inner diameter; B is the distance between the center of the eccentric shaft's inner sleeve's outer diameter and the center of its inner diameter; L is the distance between the eccentric fulcrum of the drill bit shaft and the center of the spherical sleeve; and Ψ is the clockwise rotation angle of the eccentric shaft's inner sleeve relative to the initial state of the eccentric angle adjustment device.

[0032] In an optional embodiment, the method further includes: obtaining a compensation angle of the tool face angle based on the rotation angle of the eccentric shaft inner sleeve according to the following formula:

[0033] When the eccentric shaft inner sleeve rotates clockwise by an angle Ψ of 0°-180° compared to the initial state of the eccentric angle adjustment device:

[0034]

[0035] When Ψ180°-360°:

[0036]

[0037] Where Δ is the compensation angle of the tool face angle; A is the distance between the center of the eccentric shaft outer diameter circle and the center of its inner diameter circle; B is the distance between the center of the eccentric shaft inner sleeve outer diameter circle and the center of its inner diameter circle. 。

[0038] In an optional embodiment, during the rotation of the eccentric shaft inner sleeve, the first graduation mark of the first angle graduation hole is observed through the first observation hole and the second observation hole;

[0039] Based on the first graduation mark, it is determined whether the eccentric shaft inner sleeve is rotated into position.

[0040] In an optional embodiment, the method further includes: when the first adjustment hole and the second adjustment hole are not in the preset connection position, before applying external force to the inner sleeve of the eccentric shaft to drive the rotation and compress the spring, it also includes: moving the first angle graduation hole of the inner sleeve of the eccentric shaft through the transition short section observation hole, and / or jogging the motor connected to the eccentric shaft to rotate the eccentric shaft so that the first adjustment hole and the second adjustment hole are in the preset connection position.

[0041] On the third aspect, based on the same inventive concept, an embodiment of the present invention further provides an application of the above-mentioned eccentric angle adjustment device of the rotary steering tool in the field of oil and gas drilling technology.

[0042] The beneficial effects of the above technical solutions provided by the embodiments of the present invention include at least:

[0043] An adjustment device provided by an embodiment of the present invention has an eccentric ring structure in which the large diameter section of the second step hole of the eccentric shaft and the eccentric shaft inner sleeve are arranged in the large diameter section of the second step hole of the eccentric shaft, and the eccentric shaft inner sleeve can rotate relative to the eccentric shaft under the action of an external force and compress the spring, and reset under the action of the restoring force of the spring, and realizes the circumferential limitation of the eccentric shaft inner sleeve by the engagement of the first meshing gear and the second meshing gear, that is, the device utilizes the characteristic of the eccentric ring body with different thicknesses to realize the adjustment of the eccentric angle of the drill shaft of the tool by the cooperation of the eccentric shaft inner sleeve and the eccentric shaft at different positions, and the eccentric shaft inner sleeve After being rotated into position, during the process of resetting under the action of the spring restoring force, the inner sleeve of the eccentric shaft can be circumferentially limited by the meshing of the first meshing gear and the second meshing gear, so as to reduce the possibility of other uncontrollable rotation of the inner sleeve of the eccentric shaft relative to the eccentric shaft, so as to improve the adjustment accuracy of the eccentric angle; and the device only needs to rotate the inner sleeve of the eccentric shaft to realize rapid adjustment of the eccentric angle of the tool, without the need for related operations of disassembling and replacing the tool, thereby reducing the operational difficulty and operation cycle of the eccentric angle adjustment of the tool, and at the same time, the structure of the device can be applied to the adjustment of different eccentric angles of the tool, thereby reducing the processing and manufacturing cost of the eccentric device.

[0044] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0045] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0047] Figure 1 Schematic diagram of the structure of the eccentric angle adjustment device of the rotary guide tool in an embodiment of the present invention;

[0048] Figure 2 Schematic diagram of the structure of the eccentric angle adjustment device of the rotary guide tool when the tool is inserted into the adjustment hole in an embodiment of the present invention;

[0049] Figure 3 Schematic diagram of the structure of the eccentric shaft inner sleeve and the toggle position of the toggle tool in an embodiment of the present invention;

[0050] Figure 4 This is another structural schematic diagram of the eccentric shaft inner sleeve and the toggling position of the toggling tool in an embodiment of the present invention;

[0051] Figure 5 Schematic diagram of the internal structure of the eccentric shaft in an embodiment of the present invention;

[0052] Figure 6 Schematic diagram of the eccentric angle adjustment device in an initial state according to an embodiment of the present invention, and a structural diagram of the positional relationship between the eccentric shaft inner sleeve and the eccentric shaft;

[0053] Figure 7 Schematic diagram of the positional relationship between the eccentric shaft inner sleeve and the eccentric shaft when the eccentric shaft inner sleeve rotates 180° relative to the initial state in an embodiment of the present invention;

[0054] Figure 8 Schematic diagram of the positional relationship between the eccentric shaft inner sleeve and the eccentric shaft when the eccentric shaft inner sleeve rotates clockwise by any angle relative to the initial state in an embodiment of the present invention.

[0055] Description of reference numerals:

[0056] 1. Eccentric shaft; 2. Transition short section; 3. Eccentric shaft inner sleeve; 4. Spring; 5. Drill shaft; 6. Spherical bushing; 7. Ball sleeve; 8. Circlip; 9. Toggle tool; 10. Positioning pin; 11. Locking screw; 12. Bearing support; 21. First step hole; 22. First adjustment hole; 23. First observation hole; 31. First meshing gear; 32. Third meshing gear; 33. First angular indexing hole; 34. Annular positioning groove; 101. Second meshing gear; 102. Second adjustment hole; 103. Second angular indexing hole; 104. Second observation hole; 105. Second step hole. DETAILED DESCRIPTION

[0057] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0058] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0060] In order to solve the problem in the prior art that the eccentric angle of the tool that can be achieved by the eccentric device cannot be adjusted, the embodiments of the present invention provide an eccentric angle adjustment device, method and related applications of a rotary steering tool to achieve rapid adjustment of the eccentric angle of the tool, thereby achieving matching between the tool's deflection capability and the service formation and drilling design, so as to adapt to the drilling requirements of different drilling layers, improve the working performance and service life of the tool, and achieve variable angle drilling of the same tool. It should be noted that the eccentric angle of the tool mentioned in the embodiments of the present invention is specifically: the angle between the center line of the drill bit shaft of the rotary steering tool and the center line of the drill string, that is, the angle between the center line of the drill bit shaft of the rotary steering tool and the center line of the small diameter section of the second stepped hole of the eccentric shaft.

[0061] The eccentric angle adjustment device of the rotary guide tool provided in the embodiment of the present invention is as follows: Figure 1 and Figure 2 As shown, it includes: an eccentric shaft 1, an eccentric shaft inner sleeve 3 and a transition short section 2;

[0062] The transition sub 2 is provided with a first stepped hole 21, the eccentric shaft 1 is arranged in the large diameter section of the first stepped hole 21, and the eccentric shaft 1 is provided with a second stepped hole 105;

[0063] The eccentric shaft inner sleeve 3 is arranged in the large diameter section of the second stepped hole 105 and is used to be connected to the drill shaft 5 of the rotary guide tool. A spring 4 is arranged between one end and the stepped surface of the first stepped hole 21, and a first meshing gear 31 is arranged at the other end. The stepped surface of the second stepped hole 105 is provided with a second meshing gear 101 that cooperates with the first meshing gear 31.

[0064] The large-diameter section of the second stepped hole 105 and the eccentric shaft inner sleeve 3 form an eccentric ring structure. The eccentric shaft inner sleeve 3 is configured to rotate relative to the eccentric shaft 1 under external force, compressing the spring 4, and reset under the restoring force of the spring 4. The engagement of the first meshing gear 31 and the second meshing gear 101 achieves circumferential positioning of the eccentric shaft inner sleeve 3, thereby adjusting the eccentric angle of the tool. Specifically, the reset of the eccentric shaft inner sleeve 3 under the restoring force of the spring 4 refers to axial reset.

[0065] An adjustment device provided by an embodiment of the present invention has an eccentric ring structure in which the large diameter section of the second step hole 105 of the eccentric shaft 1 and the eccentric shaft inner sleeve 3 are arranged in the large diameter section of the second step hole 105 of the eccentric shaft 1. The two eccentric rings can be placed in different positions by rotating the eccentric inner sleeve, thereby forming different eccentric angles. The function of the spring 4 is to ensure that the eccentric shaft inner sleeve 3 can be automatically pressed back under the elastic force of the spring 4 when it is squeezed in the direction of the spring 4. Therefore, its elastic force can ensure that it can be compressed under the action of external force to eliminate the meshing effect between the first meshing gear 31 and the second meshing gear 101, and can also press the eccentric shaft inner sleeve 3 back normally under the elastic force of the spring 4 after the external force disappears.

[0066] Specifically, refer to Figure 1 As shown, when the eccentric shaft inner sleeve 3 is connected to the drill shaft 5, the ball sleeve 7 and the spherical sleeve 6 are installed at the end of the drill shaft 5 and fixed to the end of the drill shaft 5 by a retaining spring 8. The spherical sleeve 6 at the end of the drill shaft 5 is installed in the interior of the eccentric shaft inner sleeve 3, so that the drill shaft 5 can be driven to swing eccentrically by driving the eccentric shaft 1 to rotate during use.

[0067] Optionally, in the embodiment of the present invention, there is no specific limitation on the specific method of applying external force to the eccentric shaft inner sleeve 3 to drive the eccentric shaft 1 to rotate, and it can be selected according to actual needs; in one embodiment, referring to Figure 1 As shown, a third meshing gear 32 is circumferentially provided on the outer wall of the eccentric shaft inner sleeve 3. A first adjustment hole 22 and a second adjustment hole 102 are provided on the transition sub 2 and the eccentric shaft 1. External force is applied to the third meshing gear 32 through the first adjustment hole 22 and the second adjustment hole 102, thereby rotating the eccentric shaft inner sleeve 3 and compressing the spring 4 by turning the third meshing gear 32. The structure in which the eccentric shaft inner sleeve 3 is rotated by turning the third meshing gear 32 has a fixed number of meshing gears, and thus can better control the rotation angle of the eccentric shaft inner sleeve 3 by turning the number of meshing gears. Simultaneously, the eccentric angle can be adjusted through the first observation hole provided in the transition sub 2 and the eccentric shaft 1, eliminating the need for disassembly and installation of the device, resulting in simple operation and ease of implementation.

[0068] Optionally, the adjustment device provided by the embodiment of the present invention refers to Figures 1 to 4As shown, it also includes: a toggle tool 9;

[0069] The lower end of the toggle tool 9 is provided with a tool gear that cooperates with the third meshing gear 32. The lower end of the toggle tool 9 is used to cooperate with the third meshing gear 32 to provide external force for the rotation of the eccentric shaft inner sleeve 3 by rotating the toggle tool 9. Specifically, when the eccentric shaft inner sleeve 3 needs to be rotated, the toggle tool 9 is inserted through the first adjustment hole 22 and the second adjustment hole 102. The tool gear engages with the third meshing gear 32 on the eccentric shaft inner sleeve 3 to promote the rotation of the eccentric shaft inner sleeve 3 by rotating the toggle tool 9. Accordingly, when the elastic force of the spring 4 is designed, its elastic force can ensure that the toggle tool 9 is relatively easy to insert, and after the toggle tool 9 is withdrawn, the eccentric shaft inner sleeve 3 is normally pressed back under the elastic force of the spring 4.

[0070] Optional, see Figure 3 As shown, in the device provided by the embodiment of the present invention, the eccentric shaft inner sleeve 3 is provided with first angle indexing holes 33 distributed along the circumferential direction, and the first angle indexing holes 33 are provided with first indexing marks;

[0071] Accordingly, refer to Figure 1 and Figure 5 As shown, the transition sub 2 and the eccentric shaft 1 are further provided with a first observation hole 23 and a second observation hole 104 for observing the first index mark of the first angle index hole 33. The provision of the angle index hole and the index mark allows for better determination of the rotational position of the eccentric shaft inner sleeve 3, further ensuring the accuracy of eccentric angle adjustment.

[0072] In one embodiment, the eccentric shaft 1 is provided with second angle indexing holes 103 distributed along the circumferential direction, and the second angle indexing holes 103 are provided with second indexing marks;

[0073] Correspondingly, the first observation hole 23 on the transition sub 2 is also used to observe the second graduation mark of the second angular graduation hole 103 on the eccentric shaft 1 during the rotation of the eccentric shaft 1 .

[0074] Since the adjustment device rotates with the external drill string when it is used in drilling operations, and the eccentric shaft 1 rotates along with the motor connected to it (not shown in the figure) in the direction opposite to the rotation direction of the transition sub 2, when an external force is applied to the eccentric shaft inner sleeve 3 to drive it to rotate, it is necessary to first ensure that the first adjustment hole 22 and the second adjustment hole 102 are in a preset connection position (such as overlap or partial overlap) to facilitate subsequent adjustment of the eccentric shaft inner sleeve 3. Setting the second graduation mark can better judge the rotation position of the eccentric shaft 1. At the same time, setting the second graduation mark can also facilitate the judgment of the preferred rotation direction of the eccentric shaft 1, so that the eccentric shaft 1 can be quickly rotated into place. Specifically, the toggle member can be used to pass through the first observation hole 23 of the transition short section 2 and the second angular indexing hole 103 of the eccentric shaft 1, to toggle the first angular indexing hole 33 of the eccentric shaft inner sleeve 3 to realize the rotation of the eccentric shaft 1, and / or by jogging the motor connected to the eccentric shaft 1, and combined with the second angular indexing hole 103 on the eccentric shaft 1 to stop and position, so as to realize the rotation of the eccentric shaft 1.

[0075] Specifically, when the eccentric shaft 1 is rotated by the electric drive motor, the required rotation angle of the eccentric shaft 1 can be determined based on the second angle index mark observed through the first observation hole 23. The motor is driven to work based on the rotation angle, and when it is estimated that it is almost stopped, a stop pin is inserted through the first observation hole 23 to stop the eccentric shaft 1 from working through the cooperation of the stop pin and the second angle index hole 103. At this time, if the eccentric shaft 1 has not rotated to the right position, the position of the eccentric shaft 1 can be further adjusted by moving the first angle index hole 33 of the eccentric shaft inner sleeve 3 according to the position of the eccentric shaft 1. The method of rotating the eccentric shaft 1 by the inching drive can avoid the situation where the eccentric shaft 1 needs to rotate a large angle, and it is troublesome and laborious to rotate the eccentric shaft 1 by moving the first angle index hole 33 of the eccentric shaft inner sleeve 3.

[0076] In an optional embodiment, the number of meshing teeth of the first angular indexing hole 33 and the third meshing gear 32 is set correspondingly, and the first angular indexing hole 33 and the third meshing teeth are evenly distributed along the circumferential direction of the eccentric shaft inner sleeve 3. Optionally, the number of meshing teeth of the first meshing gear 31 can also be set correspondingly to the number of meshing teeth of the first indexing hole and the third meshing gear 32.

[0077] The symbols and marking order of the graduation marks (first graduation mark and second graduation mark) can be selected according to actual needs. For example, the graduation marks can be represented by numbers. Based on the selected 0-degree position, 360° is divided into equal parts according to the number of meshing gears between the eccentric shaft 1 and the eccentric inner sleeve to form angular graduation holes. The graduation holes are then marked based on the graduation marks. The marking order can be, for example, marked in a clockwise direction as 1, 2, 3, etc. Preferably, the position of maximum thickness of the eccentric ring of the eccentric shaft 1 is marked as its corresponding 0-degree position, and the position of maximum thickness of the eccentric ring of the eccentric shaft inner sleeve 3 is marked as its corresponding 0-degree position.

[0078] In one embodiment, referring to Figure 1 As shown, the adjustment device provided by the embodiment of the present invention further includes: a locking screw 11, which is used to achieve the connection and fixation of the eccentric shaft 1 and the eccentric shaft inner sleeve 3 by locking the second observation hole 104 of the eccentric shaft 1 and the corresponding first angle dividing hole 33 on the eccentric shaft inner sleeve 3; specifically, after the eccentric shaft inner sleeve 3 is rotated to the desired position, the eccentric shaft 1 and the eccentric shaft inner sleeve 3 can be connected and fixed by installing the locking screw 11 to avoid the eccentric shaft inner sleeve 3 from rotating relative to the eccentric shaft 1 during the drilling application, causing the drilling trajectory of the tool to deviate from the preset trajectory.

[0079] Optionally, the adjustment device provided by the embodiment of the present invention further includes: an observation hole plug (not shown in the figure) and an adjustment hole plug (not shown in the figure), which are used to respectively block the first observation hole 23 and the first adjustment hole 22 of the transition short section 2; specifically, when the eccentric shaft inner sleeve 3 is rotated into place and fixed by the locking screw 11, the observation hole plug and the adjustment hole plug can be installed to prevent the cement slurry in the wellbore from entering the interior of the device through the adjustment hole and the observation hole during use to damage the electronic components inside the device; accordingly, when the eccentric angle is adjusted next time, the adjustment hole plug and the observation hole plug of the transition short section 2 must be opened first.

[0080] Furthermore, the second observation hole 104 and the second adjustment hole 102 of the eccentric shaft 1 are arranged at the thickest part of the eccentric ring of the eccentric shaft 1. On the one hand, they can better mark the 0 degree position, and on the other hand, they can ensure that the initial adjustment position of the eccentric shaft 1 remains unchanged when the eccentric angle is adjusted.

[0081] In an optional embodiment, the adjustment device provided by the embodiment of the present invention refers to Figure 3 and Figure 4 As shown, an annular positioning groove 34 is provided on the outer wall of the eccentric shaft inner sleeve 3;

[0082] The annular positioning groove 34 is used to achieve axial limitation of the eccentric ring inner sleeve by cooperating with the positioning piece passing through the first adjustment hole 22 and the second adjustment hole 102 when an external force is applied to the eccentric shaft inner sleeve 3 to drive it to rotate.

[0083] Specifically, when external force is applied to the eccentric shaft inner sleeve 3 to rotate the eccentric shaft inner sleeve 3 and compress the spring 4, the annular positioning groove 34 is at the observation hole position. At this time, a positioning piece can be placed in the observation hole, and the positioning piece can cooperate with the annular positioning groove 34 to axially limit the eccentric shaft inner sleeve 3. At this time, when the eccentric shaft inner sleeve 3 is rotated, it can be ensured that the eccentric shaft inner sleeve 3 is always at the maximum position of the compression spring 4. After the positioning piece is positioned, the eccentric shaft inner sleeve 3 can be prevented from being pressed back by the elastic force of the spring 4, so that the second meshing gear 101 on the inner step surface of the eccentric shaft 1 and the first meshing gear 31 at the end of the eccentric shaft inner sleeve 3 are in a disengaged state, thereby making the shifting tool 9 rotate more smoothly, so as to facilitate the position shifting of the eccentric shaft inner sleeve 3, and at the same time, it can avoid the collision between the first meshing gear 31 and the second meshing gear 101 to affect the smooth rotation of the eccentric shaft inner sleeve 3. At this time, when the eccentric shaft inner sleeve 3 is reset under the elastic force of the spring 4, the first index mark of the first angle index hole 33 of the eccentric shaft inner sleeve 3 can be observed through the observation hole to determine whether the eccentric shaft inner sleeve 3 is rotated into place based on the first angle index mark, so as to ensure the accuracy of the eccentric angle adjustment of the tool. Specifically, the positioning member can be a positioning pin 10.

[0084] The following is a detailed exemplary description of the specific operation process of adjusting the eccentric angle using the device provided in the embodiment of the present invention:

[0085] Step 1: Open the adjustment hole plug and the observation hole plug of the transition short section 2. When the first adjustment hole 22 and the second adjustment hole 102 are not in the overlapping state, rotate the eccentric shaft 1 to make the first adjustment hole 22 of the transition short section 2 coincide with the second adjustment hole 102 of the eccentric shaft 1, and determine it as the initial position of the angle adjustment.

[0086] Step 2: Remove the locking screw 11, insert the toggle tool 9 from the first adjustment hole 22 and the second adjustment hole 102, and rotate the toggle tool 9 to rotate the eccentric shaft inner sleeve 3 through the tool gear engaging with the third interlocking gear on the eccentric shaft inner sleeve 3;

[0087] Step 3: When the tooling 9 is rotated, the eccentric shaft inner sleeve 3 is driven to rotate, and at the same time, the eccentric shaft inner sleeve 3 is pushed to be squeezed toward the spring 4. At this time, the annular positioning groove 34 of the eccentric shaft inner sleeve 3 can be seen through the observation hole of the transition short section 2 and the observation hole of the eccentric shaft 1. The positioning pin 10 is placed through the positioning groove, and the eccentric shaft inner sleeve 3 is rotated to a specific angle according to the required eccentric angle;

[0088] Step 4: After rotating to the desired angle, remove the positioning pin 10 and the toggle tool 9. The eccentric shaft inner sleeve 3 is pressed back under the rebound force of the spring 4, and the first meshing gear 31 is meshed with the second meshing gear 101 inside the eccentric shaft 1. Observe through the first observation hole 23 and the second observation hole 104 whether the first angle indexing hole 33 is in place. After the first angle indexing hole 33 is in place, install the locking screw 11 to ensure that the eccentric shaft 1 and the eccentric shaft inner sleeve 3 are tightly connected;

[0089] Step 5: Install the observation hole screw plug and the adjustment hole screw plug on the transition short section 2 to complete the tool eccentric angle adjustment.

[0090] In one embodiment, the eccentric angle adjustment device of the rotary guide tool provided by the present invention includes: an eccentric shaft 1, a transition short section 2, an eccentric shaft inner sleeve 3, a spring 4, a retaining spring 8, a toggle tool 9, a positioning pin 10, a locking screw 11, etc.; specifically, the eccentric shaft 1 is installed in the transition short section 2 through a bearing support 12, the eccentric shaft inner sleeve 3 is installed inside the eccentric shaft 1, and the first meshing gear on its inner side is meshed with the second meshing gear on the inner end face of the eccentric shaft 1; the eccentric shaft 1 and the eccentric shaft inner sleeve 3 are both eccentric rings, and the required eccentric angle is formed by adjusting the rotation position of the eccentric ring to achieve eccentric adjustment; and in actual application, the ball sleeve 7 and the spherical sleeve 6 are installed at the end of the drill shaft 5, and fixed to the end of the drill shaft by the retaining spring 8, the spherical sleeve 6 at the end of the drill shaft is installed in the interior of the eccentric shaft inner sleeve 3, and the drill shaft 5 is driven to rotate by driving the eccentric shaft 1 Eccentric swing; the transition short section 2 and the eccentric shaft 1 are both provided with an observation hole and an adjustment hole. The position of the eccentric shaft and the eccentric shaft inner sleeve can be determined through the observation hole, and the insertion and adjustment of the toggle tool can be realized through the adjustment hole; the eccentric shaft inner sleeve 3 moves toward the spring under the toggle tool 9, and can be axially positioned by the cooperation of the positioning pin 10 and the annular positioning groove on the eccentric shaft inner sleeve 3. The eccentric shaft inner sleeve 3 is adjusted to the required eccentric angle by toggling the eccentric angle. After the eccentric angle is set, the toggle tool 9 and the positioning pin 10 are pulled out, and the eccentric shaft inner sleeve 3 is pressed back under the elastic force of the spring 4, and the first meshing gear inside the eccentric shaft inner sleeve 3 is meshed and locked with the second meshing gear on the internal end face of the eccentric shaft 1. Finally, the locking screw 11 is installed to connect and fix the eccentric shaft and the eccentric shaft inner sleeve, and the observation hole screw plug and the adjustment hole screw plug are installed to complete the eccentric angle adjustment of the tool.

[0091] The eccentric angle adjustment device provided in the embodiment of the present invention takes into account the influence of the guiding deflection angle of the directional rotary guiding tool on the tool performance and the slope rate, and proposes to timely adjust the eccentric angle of the rotary guiding tool in combination with the drilling design and the formation conditions, so that the tool can adjust the eccentric angle according to actual needs during use, so as to better realize the guiding tool performance, improve the adaptability and service life of the directional rotary guiding tool, and provide assistance for oil and gas exploration and development.

[0092] Based on the same inventive concept, an embodiment of the present invention further provides a method for adjusting the eccentric angle of a rotary guide tool based on the above-mentioned eccentric angle adjustment device, comprising:

[0093] The drill bit shaft of the rotary guide tool is installed in the eccentric shaft inner sleeve of the eccentric angle adjustment device through the ball sleeve and the spherical shaft sleeve;

[0094] Determining a target eccentricity angle of the rotary steerable tool based on the geological conditions of the target formation; the specific method for determining the target eccentricity angle of the rotary steerable tool can be referred to the prior art and will not be described in detail in the embodiments of the present invention;

[0095] Determining a target rotation angle of the eccentric shaft inner sleeve based on a pre-established relationship between the eccentric angle of the tool and the rotation angle of the eccentric shaft inner sleeve of the adjustment device;

[0096] The inner sleeve of the eccentric shaft is rotated by the target rotation angle to adjust the eccentric angle of the tool.

[0097] In an optional embodiment, the method provided by the embodiment of the present invention further includes: determining the state where the maximum thickness of the eccentric shaft inner sleeve coincides with the maximum thickness of the eccentric shaft as the initial state of the eccentric angle adjustment device;

[0098] When the eccentric angle adjustment device is in the initial state, the relationship between the eccentric angle of the tool and the rotation angle of the eccentric shaft inner sleeve is constructed based on the following formula:

[0099]

[0100] Where θ is the current tool eccentric angle; A is the distance between the outer and inner centers of the eccentric shaft; B is the distance between the outer and inner centers of the eccentric shaft inner sleeve; L is the distance between the eccentric support point of the drill shaft and the center of the spherical sleeve; and Ψ is the clockwise rotation angle of the eccentric shaft inner sleeve relative to the initial state of the eccentric angle adjustment device. The values ​​of A and B are available after the eccentric shaft and eccentric shaft inner ring are manufactured. The eccentric support point of the drill shaft is the center point of the connecting bearing when the drill shaft is installed in the guide sub housing through the connecting bearing.

[0101] In one embodiment, when a third meshing gear is provided on the eccentric shaft inner sleeve, the rotation angle that the eccentric shaft inner sleeve can achieve is set corresponding to the number of the third meshing gears provided thereon, that is, if the number of meshing teeth of the third meshing gear of the eccentric shaft is n, the angle that the eccentric shaft inner sleeve rotates each time the distance of one meshing tooth is The relationship between the eccentric angle of the tool constructed at this time and the rotation angle of the eccentric shaft inner sleeve is: the relationship between the achievable rotation angle of the eccentric shaft inner sleeve and its corresponding achievable eccentric angle.

[0102] It should be noted that in actual applications, a corresponding positional relationship is established between the initial tool face of the tool and the rotary transformer of the motor. However, during the process of adjusting the eccentric angle of the tool, the initial tool face will change. Therefore, tool face compensation is required during the actual drilling process. The angle of the tool face angle to be compensated can be obtained by the following calculation formula:

[0103] When the eccentric shaft inner sleeve rotates clockwise by an angle Ψ of 0°-180° compared to the initial state of the eccentric angle adjustment device:

[0104]

[0105] When Ψ180°-360°:

[0106]

[0107] Where Δ is the compensation angle of the tool face angle; A is the distance between the center of the eccentric shaft outer diameter circle and the center of its inner diameter circle; B is the distance between the center of the eccentric shaft inner sleeve outer diameter circle and the center of its inner diameter circle. 。

[0108] That is, the tool face angle of the compensated tool is:

[0109] Where, is the initial tool face angle of the tool in downhole posture.

[0110] In one embodiment, the following exemplary description is given of the calculation contents of the compensation angle of the tool eccentric angle and the tool face angle when the maximum thickness of the eccentric shaft inner sleeve and the maximum thickness of the eccentric shaft are marked as corresponding to 0 and the eccentric shaft and the eccentric shaft inner sleeve are in different positions: Figure 6 The figure shows the structure of the eccentric angle adjustment device in its initial state. At this time, the mark 0 of the eccentric shaft 1 is adjusted to the top, and the mark 0 of the eccentric shaft inner sleeve 3 is also at the top. The positions of the outer diameter circle of the outer ring (eccentric shaft), the center of the inner diameter circle of the outer ring, the center of the outer diameter circle of the inner ring (eccentric shaft inner sleeve), and the center of the inner diameter circle of the inner ring are referenced. Figure 6 As shown, the eccentric angle of the tool is the largest at this time. Assuming that the tool face angle in the well is

[0111] At this time, the eccentricity of the eccentric shaft and the eccentric shaft inner sleeve is superimposed, and the eccentric angle calculation formula of the tool is:

[0112]

[0113] The tool face angle compensation angle is 0 degrees at this time, that is, no compensation is required, and the tool face angle corresponding to the tool in the well remains at the original angle.

[0114] Refer to Figure 7 As shown, it is a schematic structural diagram of the positions of the inner eccentric sleeve and the eccentric shaft when the inner eccentric sleeve rotates 180° relative to the initial state. At this time, it is set that the mark 0 of the eccentric shaft 1 is adjusted to the uppermost position. After the mark 0 of the inner eccentric sleeve 3 is adjusted to the uppermost position, the inner eccentric sleeve 3 rotates 180° clockwise from the uppermost mark 0 position. In this case, the positions of the outer ring (eccentric shaft) outer diameter circle, the outer ring inner diameter center, the inner ring (inner eccentric sleeve) outer diameter center, and the inner ring inner diameter center are referred to Figure 7 As shown, the eccentricity of the eccentric shaft and the inner eccentric sleeve cancels each other out, and the eccentric angle is the smallest:

[0115] At this time, if A≧B, the eccentric angle is calculated as:

[0116]

[0117] The tool face angle does not need to be compensated, and the tool face angle corresponding to the tool in the well is still the original angle

[0118] If A<B, since the eccentric angle cannot be negative, the eccentric angle is calculated at this time as: The tool face angle corresponding to the tool in the well is

[0119] Refer to Figure 8 As shown, it is a schematic structural diagram when the inner eccentric sleeve rotates an arbitrary angle clockwise relative to the initial state At this time, it is set that the mark 0 of the eccentric shaft 1 is adjusted to the uppermost position, and the inner eccentric sleeve 3 rotates an arbitrary angle Ψ clockwise from the uppermost mark 0 position. In this case, among them, the positions of the outer ring (eccentric shaft) outer diameter circle, the outer ring inner diameter center, the inner ring (inner eccentric sleeve) outer diameter center, and the inner ring inner diameter center are referred to Figure 8 As shown, where Figure 8 The circle drawn by the external dotted line in it is the auxiliary circle drawn when determining the inner ring inner diameter center. The superposition of the eccentric shaft and the inner eccentric sleeve is relatively complicated, and the eccentric angle is calculated as:

[0120]

[0121] At this time, when Ψ is 0°-180°, the tool face angle is:

[0122]

[0123] When Ψ is 180°-360°: At this time, the calculated value of the eccentric angle is the same, and the tool face compensation angle Δ changes. At this time, the tool face angle is:

[0124] In an optional embodiment, the eccentric angle adjustment method of the rotary guide tool provided by the embodiment of the present invention can observe the first graduation mark of the first angle graduation hole through the first observation hole and the second observation hole during the process of rotating the eccentric shaft inner sleeve;

[0125] Based on the first graduation mark, determine whether the eccentric shaft inner sleeve is rotated into place.

[0126] In an optional embodiment, the eccentric angle adjustment method for a rotary guide tool provided in an embodiment of the present invention further includes: when the first adjustment hole and the second adjustment hole are not in a preset connection position, before applying an external force to the eccentric shaft inner sleeve to drive the rotation and compress the spring, further including: moving the first angle indexing hole of the eccentric shaft inner sleeve through the transition short section observation hole, and / or jogging a motor connected to the eccentric shaft to rotate the eccentric shaft so that the first adjustment hole and the second adjustment hole are in a preset connection position. The preset connection position may be a coincidence position.

[0127] Regarding the method in the above embodiment, the specific structure and use process of the eccentric angle adjustment device have been described in detail in the embodiment of the eccentric angle adjustment device, and will not be elaborated here.

[0128] Based on the same inventive concept, an embodiment of the present invention further provides an application of the above-mentioned eccentric angle adjustment device in the field of oil and gas drilling technology.

[0129] In order to better exert the performance of the tool and achieve the matching of the tool with the formation and drilling design, the present invention provides an eccentric angle adjustment device, method and related applications of a rotary steering tool. The device can quickly adjust the eccentric angle according to needs, adjust the compensation tool face angle by changing the eccentric angle, and realize eccentric adjustment drilling of the steering tool.

[0130] It should be understood that the specific order or hierarchy of steps in the disclosed processes is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0131] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are therefore hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0132] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but one of ordinary skill in the art will recognize that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained in terms of "including," used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."

Claims

1. An eccentric angle adjustment device for a rotary guide tool, characterized in that: include: Toggle fixture, eccentric shaft, eccentric shaft inner sleeve and transition nipple; The transition sub is provided with a first stepped hole, the eccentric shaft is arranged in the large diameter section of the first stepped hole, and the eccentric shaft is provided with a second stepped hole; The eccentric shaft inner sleeve is arranged in the large diameter section of the second stepped hole, and is used to be connected to the drill shaft of the rotary guide tool, and a spring is arranged between one end and the step surface of the first stepped hole, and a first meshing gear is arranged at the other end, and a second meshing gear that matches the first meshing gear is arranged on the step surface of the second stepped hole; The large diameter section of the second stepped hole and the eccentric shaft inner sleeve form an eccentric ring structure; A third meshing gear is circumferentially provided on the outer wall of the eccentric shaft inner sleeve, a first adjustment hole and a second adjustment hole are provided on the transition short section and the eccentric shaft, a tooling gear that matches the third meshing gear is provided at the lower end of the toggle tooling, and the lower end of the toggle tooling is used to pass through the first adjustment hole and the second adjustment hole to match the third meshing gear, so as to provide external force for the rotation of the eccentric shaft inner sleeve by rotating the toggle tooling; The eccentric shaft inner sleeve is used to rotate relative to the eccentric shaft and compress the spring under the action of external force, and to reset under the action of the restoring force of the spring, and to achieve circumferential limitation of the eccentric shaft inner sleeve through the engagement of the first meshing gear and the second meshing gear to achieve adjustment of the eccentric angle of the tool.

2. The device according to claim 1, wherein The eccentric shaft inner sleeve is provided with first angle indexing holes distributed along the circumferential direction, and the first angle indexing holes are provided with first indexing marks; Correspondingly, a first observation hole and a second observation hole are respectively provided on the transition short section and the eccentric shaft, for observing the first graduation mark of the first angle graduation hole.

3. The device according to claim 2, wherein The eccentric shaft is provided with second angle indexing holes distributed along the circumferential direction, and the second angle indexing holes are provided with second indexing marks; Correspondingly, the first observation hole on the transition sub is also used to observe the second graduation mark of the second angular graduation hole on the eccentric shaft during the rotation of the eccentric shaft.

4. The device according to claim 2, wherein The numbers of the first angle indexing hole and the meshing teeth of the third meshing gear are set correspondingly, and the meshing teeth of the first angle indexing hole and the third meshing gear are evenly distributed along the circumferential direction of the eccentric shaft inner sleeve.

5. The device according to claim 2, wherein Also includes: An observation hole screw plug and an adjustment hole screw plug are used to respectively block the first observation hole and the first adjustment hole of the transition nipple; The second observation hole and the second adjustment hole of the eccentric shaft are arranged at the location where the thickness of the eccentric ring of the eccentric shaft is the largest.

6. The device according to claim 2, wherein It also includes a locking screw, which is used to lock the second observation hole of the eccentric shaft and the corresponding first angle indexing hole on the eccentric shaft inner sleeve to achieve the connection and fixation between the eccentric shaft and the eccentric shaft inner sleeve.

7. The device according to any one of claims 2 to 6, characterized in that: An annular positioning groove is provided on the outer wall of the inner sleeve of the eccentric shaft; The annular positioning groove is used to achieve axial limitation of the eccentric ring inner sleeve by cooperating with the positioning piece passing through the first adjustment hole and the second adjustment hole when an external force is applied to the eccentric shaft inner sleeve to drive it to rotate.

8. A method for adjusting the eccentric angle of a rotary guide tool, characterized in that: The eccentric angle adjustment device of the rotary steering tool according to any one of claims 1 to 7 is implemented, comprising: The drill bit shaft of the rotary guide tool is installed in the eccentric shaft inner sleeve of the eccentric angle adjustment device through the ball sleeve and the spherical shaft sleeve; Determine the target eccentricity angle of the rotary steerable tool based on the geological conditions of the target formation; Determining a target rotation angle of the eccentric shaft inner sleeve based on a pre-established relationship between the eccentric angle of the tool and the rotation angle of the eccentric shaft inner sleeve of the adjustment device; The inner sleeve of the eccentric shaft is rotated by the target rotation angle to adjust the eccentric angle of the tool.

9. The method according to claim 8, wherein Also includes: The state where the maximum thickness of the eccentric shaft inner sleeve coincides with the maximum thickness of the eccentric shaft is determined as the initial state of the eccentric angle adjustment device; When the eccentric angle adjustment device is in the initial state, the relationship between the eccentric angle of the tool and the rotation angle of the eccentric shaft inner sleeve is constructed based on the following formula: Where θ is the current tool eccentric angle; A is the distance between the center of the eccentric shaft's outer diameter and the center of its inner diameter; B is the distance between the center of the eccentric shaft's inner sleeve's outer diameter and the center of its inner diameter; L is the distance between the eccentric support point of the drill bit shaft and the center of the spherical sleeve. It is the rotation angle of the eccentric shaft inner sleeve in the clockwise direction compared to the initial state of the eccentric angle adjustment device.

10. The method according to claim 9, wherein Also includes: Based on the rotation angle of the eccentric shaft inner sleeve, the compensation angle of the tool face angle is obtained based on the following formula: When the eccentric shaft inner sleeve rotates clockwise compared to the initial state of the eccentric angle adjustment device, the rotation angle When the angle is 0°-180°: ； when When the angle is 180°-360°: ； Where, is the compensation angle of the tool face angle; A is the distance between the center of the outer diameter circle of the eccentric shaft and the center of its inner diameter circle; B is the distance between the center of the outer diameter circle of the inner sleeve of the eccentric shaft and the center of its inner diameter circle.

11. The method according to claim 8, wherein During the process of rotating the eccentric shaft inner sleeve, observing the first graduation mark of the first angle graduation hole of the eccentric shaft inner sleeve through the first observation hole and the second observation hole; Based on the first graduation mark, it is determined whether the eccentric shaft inner sleeve is rotated into position.

12. The method according to any one of claims 8 to 11, characterized in that: Also includes: When the first adjustment hole and the second adjustment hole are not in the preset connection position, before applying external force to the inner sleeve of the eccentric shaft to drive it to rotate and compress the spring, it also includes: moving the first angle graduation hole of the inner sleeve of the eccentric shaft through the transition short section observation hole, and / or jogging the motor connected to the eccentric shaft to rotate the eccentric shaft so that the first adjustment hole and the second adjustment hole are in the preset connection position.

13. Application of the eccentric angle adjustment device of a rotary steering tool according to any one of claims 1 to 7 in the field of oil and gas drilling technology.

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