Eccentric angle adjusting device and method of rotary steering tool and related application

Abstract

The invention discloses a rotary steering tool eccentric angle adjusting device and method and related application. The adjusting device comprises an eccentric shaft, an eccentric shaft inner sleeve and a transition nipple, the transition nipple is provided with a first stepped hole, the eccentric shaft is arranged in a 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 used for being connected with a drill bit shaft, a spring is arranged between one end of the eccentric shaft inner sleeve and the stepped surface of the first stepped hole, a first meshing gear is arranged at the other end of the eccentric shaft inner sleeve, and a second meshing gear matched with the first meshing gear is arranged on the stepped surface of the second stepped hole; the large-diameter section of the second step hole and the eccentric shaft inner sleeve are of an eccentric ring structure. The eccentric shaft inner sleeve is used for rotating relative to the eccentric shaft under the action of external force, compressing the spring and resetting under the action of restoring force of the spring, and circumferential limiting of the eccentric shaft inner sleeve is achieved through meshing of the first meshing gear and the second meshing gear. And the eccentric angle of the tool can be adjusted.

Description

Technical Field

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

[0002] With the continuous development of drilling technology, well types such as horizontal wells and extended reach wells are gradually increasing, which is more conducive to achieving long well section crossing within a single well oil layer and drilling into multiple regional oil layers, thereby improving the recovery rate of a single well. Fully rotary steerable tools are widely used in horizontal wells and extended reach wells as a convenient, fast, high-speed and efficient steerable tool. The fully rotary drilling method not only reduces the time spent on directional drilling, but also reduces friction resistance, making the wellbore trajectory smoother and reducing downhole risks. Due to the differences in formations and inclination requirements in the service well section, 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 inclination requirements, fast, efficient and precise drilling will be achieved.

[0003] Rotary drill bit pointing guide tools generally use an eccentric mechanism to achieve tool eccentric pointing, and the size of the eccentric angle determines the strength of the tool's deflection ability. The larger the eccentric angle, the stronger the deflection ability, but at the same time, the tool will bear greater torque and resistance to eccentric drilling, and the greater the power required for pointing. Since the power of the motor required for pointing is limited, in order to better realize the function of the motor, it is necessary to use a large eccentric angle in the high deflection rate section, and take measures such as reducing drilling pressure to reduce the output power of the motor; a small eccentric angle is used in the low deflection rate section or the stable deflection section to reduce the torque and rotational resistance caused by the eccentricity of the drill bit, and at the same time increase the drilling pressure and other parameters to increase the mechanical drilling speed. Therefore, by adjusting the size of the eccentric angle of the tool, the matching of the tool with the formation and the drilling design can be better achieved, and the drilling efficiency and drilling quality can be improved; while the structure of the eccentric mechanism in the prior art is generally not adjustable, and it can only make the tool have a certain eccentric angle. When the eccentric angle of the tool needs to be changed, it is necessary to replace the rotary guide tool with a different eccentric mechanism to achieve it. 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, method and related applications for adjusting the eccentric angle of a rotary guide tool 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 short section;

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

[0008] The eccentric shaft inner sleeve is arranged in the large diameter section of the second step 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 step hole, and a first meshing gear is arranged at the other end, and a second meshing gear matching with the first meshing gear is arranged on the step surface of the second step 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 meshing of the first meshing gear and the second meshing gear, so as 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 arranged on the transition short section and the eccentric shaft, for applying an 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 tooling is provided with a tooling gear that matches the third meshing gear. 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.

[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 also 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 short section is also used to observe the second graduation mark of the second angle graduation hole on the eccentric shaft during the rotation of the eccentric shaft.

[0017] In an optional embodiment, the numbers of the first angle indexing hole and the meshing teeth of the third meshing gear are set correspondingly, and the first angle indexing hole and the meshing teeth of 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, which are used to respectively block the first observation hole and the first adjustment hole of the transition short section;

[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 the eccentric shaft inner sleeve is driven to rotate by applying external force to the eccentric shaft inner sleeve.

[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 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 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 adjusting 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 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;

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

[0032] In an optional embodiment, the method further comprises: obtaining a compensation angle of the tool face angle based on the rotation angle of the eccentric shaft inner sleeve and 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 outer diameter of the eccentric shaft and the center of its inner diameter; B is the distance between the center of the outer diameter of the inner sleeve of the eccentric shaft and the center of its inner diameter 。

[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 place.

[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 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.

[0041] In a 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 a rotary steering tool in the field of oil and gas drilling technology.

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

[0043] The adjustment device provided by the embodiment of the present invention has an eccentric ring structure formed by the large diameter section of the second step hole of the eccentric shaft and the eccentric shaft inner sleeve, wherein the eccentric shaft inner sleeve is 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 the circumferential limitation of the eccentric shaft inner sleeve is achieved through the meshing of the first meshing gear and the second meshing gear, that is, the device utilizes the characteristic of unequal thickness of the eccentric ring body, and realizes the adjustment of the eccentric angle of the drill shaft of the tool through the cooperation of the eccentric shaft inner sleeve and the eccentric shaft at different positions, and the eccentric shaft inner sleeve After rotating into position, during the process of resetting under the action of the spring restoring force, the eccentric shaft inner sleeve can be circumferentially limited by the meshing of the first meshing gear and the second meshing gear to reduce the possibility of other uncontrollable rotation of the eccentric shaft inner sleeve relative to the eccentric shaft, so as to improve the adjustment accuracy of the eccentric angle; and the device can quickly adjust the eccentric angle of the tool by rotating the eccentric shaft inner sleeve, without the need for related operations of disassembling and replacing the tool, thereby reducing the operational difficulty and operation cycle of the tool's eccentric angle adjustment. At the same time, the device has one structure that can be used for the adjustment of different eccentric angles of the tool, 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 partly become apparent from the description, or understood by practicing the present invention. The purpose 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 It is a structural schematic diagram of an eccentric angle adjustment device of a rotary guide tool in an embodiment of the present invention;

[0048] Figure 2 It is a structural schematic diagram of an eccentric angle adjustment device for a rotary guide tool when a tool is inserted into an adjustment hole in an embodiment of the present invention;

[0049] Figure 3 It is a structural schematic diagram of the eccentric shaft inner sleeve and the toggle position of the toggle tool in an embodiment of the present invention;

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

[0051] Figure 5 This is a schematic diagram of the internal structure of the eccentric shaft in an embodiment of the present invention;

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

[0053] Figure 7 It is a structural schematic diagram of the positional relationship between the eccentric shaft inner sleeve and the eccentric shaft when the eccentric shaft inner sleeve is rotated 180° relative to the initial state in an embodiment of the present invention;

[0054] Figure 8 It is a structural 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 angle indexing hole; 34. Annular positioning groove; 101. Second meshing gear; 102. Second adjustment hole; 103. Second angle indexing hole; 104. Second observation hole; 105. Second step hole. DETAILED DESCRIPTION

[0057] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the 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. On the contrary, 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", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In order to solve the problem that the eccentric angle of the tool that can be achieved by the eccentric device in the prior art is not adjustable, the embodiments of the present invention provide an eccentric angle adjustment device, method and related applications of a rotary guide tool to achieve rapid adjustment of the eccentric angle of the tool, thereby achieving the matching degree 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 guide 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 guide tool and the center line of the small diameter section of the second step 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 step hole 21, the eccentric shaft 1 is arranged in the large diameter section of the first step hole 21, and the eccentric shaft 1 is provided with a second step hole 105;

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

[0064] The large diameter section of the second step hole 105 and the eccentric shaft inner sleeve 3 form an eccentric ring structure; the eccentric shaft inner sleeve 3 is used to rotate relative to the eccentric shaft 1 and compress the spring 4 under the action of an external force, and reset under the action of the restoring force of the spring 4, and the circumferential limit of the eccentric shaft inner sleeve 3 is achieved through the engagement of the first meshing gear 31 and the second meshing gear 101, so as to adjust the eccentric angle of the tool. Specifically, the reset of the eccentric shaft inner sleeve 3 under the action of the restoring force of the spring 4 specifically refers to axial reset.

[0065] The adjustment device provided by the embodiment of the present invention has an eccentric shaft 1, in which the large diameter section of the second step hole 105 and the eccentric shaft inner sleeve 3 are eccentric ring structures. The eccentric shaft inner sleeve 3 is 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 to form 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 when in 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 provided on the outer wall of the eccentric shaft inner sleeve 3 along the circumferential direction, and a first adjustment hole 22 and a second adjustment hole 102 are provided on the transition short section 2 and the eccentric shaft 1, for applying an external force to the third meshing gear 32 through the first adjustment hole 22 and the second adjustment hole 102, so as to drive the eccentric shaft inner sleeve 3 to rotate and compress the spring 4 by turning the third meshing gear 32. The structure that realizes the rotation of the eccentric shaft inner sleeve 3 by turning the third meshing gear 32, since the number of meshing gears provided is fixed, the structure can better realize the control of the rotation angle of the eccentric shaft inner sleeve 3 by the number of meshing gears to be turned; at the same time, the structure can adjust the eccentric angle through the first observation hole provided on the transition short section 2 and the eccentric shaft 1, without the need to disassemble and install the device, and the operation is simple and easy to implement.

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

[0069] Among them, the lower end of the toggle tool 9 is provided with a tool gear that matches the third meshing gear 32, and the lower end of the toggle tool 9 is used to match the third meshing gear 32, so as 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 from the first adjustment hole 22 and the second adjustment hole 102, and the tool gear is engaged with the third meshing gear 32 on the eccentric shaft inner sleeve 3, so as 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 at this time, its elastic force can ensure that the toggle tool 9 is relatively easy during the insertion process, and can also press the eccentric shaft inner sleeve 3 back normally under the elastic force of the spring 4 after the toggle tool 9 is withdrawn.

[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 also provided with a first observation hole 23 and a second observation hole 104 for observing the first graduation mark of the first angle graduation hole 33. By providing the angle graduation hole and the graduation mark, the rotation position of the eccentric shaft inner sleeve 3 can be better judged to further ensure the accuracy of the 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 angle graduation hole 103 on the eccentric shaft 1 during the rotation of the eccentric shaft 1 .

[0074] When the adjustment device is used in drilling operations, the transition short section 2 rotates with the external drill string, 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 short section 2. Therefore, 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 dividing mark can better determine the rotation position of the eccentric shaft 1. At the same time, setting the second dividing mark can also facilitate the determination 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 angle dividing hole 103 of the eccentric shaft 1, to toggle the first angle dividing hole 33 of the eccentric shaft inner sleeve 3 to realize the rotation of the eccentric shaft 1, and / or to drive the motor connected to the eccentric shaft 1 by jogging, and combined with the second angle dividing 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, and the motor is driven to work based on the rotation angle. When it is estimated that the motor 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 is not rotated to the right position, the first angle index hole 33 of the eccentric shaft inner sleeve 3 can be moved according to the position of the eccentric shaft 1 to further adjust the position of the eccentric shaft 1. The method of driving the eccentric shaft 1 to rotate by inching can avoid the situation where the eccentric shaft 1 needs to rotate at 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 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] Among them, 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 to set angle graduation holes according to the number of meshing gears between the eccentric shaft 1 and the eccentric inner sleeve, and the graduation holes are marked based on the graduation marks, and the marking order can be marked as 1.2.3... in a clockwise direction. Among them, it is preferred to mark the maximum thickness position of the eccentric ring of the eccentric shaft 1 as its corresponding 0 degree position, and the maximum thickness position of the eccentric ring of the eccentric shaft inner sleeve 3 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 also 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, so that the drilling trajectory of the tool deviates from the preset trajectory.

[0079] Optionally, the adjustment device provided in 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 respectively used to seal 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 to damage the electronic components inside the device during use; 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, which can better mark the 0 degree position on the one hand, and ensure that the initial adjustment position of the eccentric shaft 1 remains unchanged when the eccentric angle is adjusted on the other hand.

[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 shaft 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 located 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 turning tool 9 rotate more smoothly, so as to facilitate the position 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 graduation mark of the first angle graduation hole 33 of the eccentric shaft inner sleeve 3 can be observed through the observation hole, and it can be judged whether the eccentric shaft inner sleeve 3 is rotated into place according to the first angle graduation mark to ensure the accuracy of adjusting the eccentric angle of the tool. Specifically, the positioning member can be a positioning pin 10.

[0084] The specific operation process of adjusting the eccentric angle by using the device provided in the embodiment of the present invention is described in detail as follows:

[0085] Step 1: Open the adjustment hole screw plug and the observation hole screw plug of the transition short section 2. When the first adjustment hole 22 and the second adjustment hole 102 are not in an overlapping state, rotate the eccentric shaft 1 to make the first adjustment hole 22 of the transition short section 2 overlap 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, mesh the tool gear with the third interlocking gear on the eccentric shaft inner sleeve 3, and rotate the toggle tool 9 to drive the eccentric shaft inner sleeve 3 to rotate;

[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 from 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, take out the positioning pin 10 and the toggle tool 9, the eccentric shaft inner sleeve 3 is pressed back under the resilience of the spring 4, and the first meshing gear 31 is meshed with the second meshing gear 101 inside the eccentric shaft 1, and the first observation hole 23 and the second observation hole 104 are used to observe 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 is tightly connected to the eccentric shaft inner sleeve 3;

[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 comprises: 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 its inner first meshing gear 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, a ball sleeve 7 and a spherical sleeve 6 are installed at the end of the drill shaft 5, and are fixed to the end of the drill shaft by a retaining spring 8, and 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 observation holes and adjustment holes, through which the positions of the eccentric shaft and the eccentric shaft inner sleeve can be determined, and through the adjustment holes, the insertion and adjustment of the toggle tool can be realized; the eccentric shaft inner sleeve 3 moves toward the spring under the toggle of 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, and 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, and 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 guidance deflection angle of the directional rotary guidance tool on the tool performance and the slope rate, and proposes to timely adjust the eccentric angle of the rotary guidance tool in combination with the drilling design and formation conditions, so that the tool can adjust the eccentric angle according to actual needs during use, so as to better realize the guidance tool performance, improve the adaptability and service life of the directional rotary guidance 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 an eccentric angle adjustment method 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] Based on the geological conditions of the target formation, determine the target eccentricity degree of the rotary steering tool; wherein, the specific method of determining the target eccentricity degree of the rotary steering tool can refer to the prior art, and the embodiment of the present invention will not be described in detail;

[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 adjusting 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] In the formula, θ is the current tool eccentric angle; A is the distance between the center of the outer diameter of the eccentric shaft and the center of its inner diameter; B is the distance between the center of the outer diameter of the inner sleeve of the eccentric shaft and the center of its inner diameter; L is the distance between the eccentric fulcrum of the drill shaft and the center point of the spherical sleeve; Ψ is the angle of the eccentric shaft inner sleeve rotated clockwise compared to the initial state of the eccentric angle adjustment device. Among them, the values ​​of A and B can be obtained after the eccentric shaft and the eccentric shaft inner ring are processed and manufactured. The eccentric fulcrum of the drill shaft is the center point of the connecting bearing when the drill shaft is installed in the guide short section housing through the connecting bearing.

[0101] In one embodiment, when the eccentric shaft inner sleeve is provided with a third meshing gear, 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 At this time, the relationship between the eccentric angle of the tool constructed 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 the corresponding eccentric angle achieved.

[0102] It should be noted that in actual application, a corresponding positional relationship is established between the initial tool face of the tool and the rotary transformer of the motor. In the process of adjusting the eccentric angle of the tool, the initial tool face will change. Therefore, tool face compensation is required in 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 outer diameter of the eccentric shaft and the center of its inner diameter; B is the distance between the center of the outer diameter of the inner sleeve of the eccentric shaft and the center of its inner diameter 。

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

[0109] In the formula, 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 As shown, it is a schematic diagram of the structure when the eccentric angle adjustment device is in the 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 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 eccentricity 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] At this time, the compensation angle of the tool face angle is 0 degrees, 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 complex, 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, in the method for adjusting the eccentric angle of a rotary guide tool provided in an embodiment of the present invention, during the process of rotating the eccentric shaft inner sleeve, the first graduation mark of the first angle graduation hole can be observed through the first observation hole and the second observation hole;

[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 of the rotary guide tool provided in the embodiment of the present invention 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 indexing 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. The preset connection position can 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 demand, 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 process 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 protection of the present disclosure. The attached method claims present the 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 above 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 the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0132] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. An eccentric angle adjustment device for a rotary guide tool, characterized in that: include: Eccentric shaft, eccentric shaft inner sleeve and transition nipple; The transition short section is provided with a first step hole, the eccentric shaft is arranged in the large diameter section of the first step hole, and the eccentric shaft is provided with a second step hole; The eccentric shaft inner sleeve is arranged in the large diameter section of the second step 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 step hole, and a first meshing gear is arranged at the other end, and a second meshing gear matching with the first meshing gear is arranged on the step surface of the second step hole; 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 meshing of the first meshing gear and the second meshing gear, so as to achieve adjustment of the eccentric angle of the tool.

2. The device according to claim 1, characterized in that 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 arranged on the transition short section and the eccentric shaft, for applying an 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.

3. The device according to claim 2, characterized in that Also includes: Toggle tooling; The lower end of the toggle tooling is provided with a tooling gear that matches the third meshing gear. 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.

4. The device according to claim 2, characterized in that 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 also provided on the transition short section and the eccentric shaft for observing the first graduation mark of the first angle graduation hole.

5. The device according to claim 4, characterized in that 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 short section is also used to observe the second graduation mark of the second angle graduation hole on the eccentric shaft during the rotation of the eccentric shaft.

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

7. The device according to claim 4, characterized in that 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.

8. The device according to claim 4, characterized in that It also includes a locking screw, which is used to lock the second observation hole of the eccentric shaft and the corresponding first angle dividing hole on the eccentric shaft inner sleeve to achieve the connection and fixation between the eccentric shaft and the eccentric shaft inner sleeve.

9. The device according to any one of claims 2 to 8, characterized in that: An annular positioning groove is provided on the outer wall of the eccentric shaft inner sleeve; 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 the eccentric shaft inner sleeve is driven to rotate by applying external force to the eccentric shaft inner sleeve.

10. A method for adjusting the eccentric angle of a rotary guide tool, characterized in that: The eccentric angle adjustment device of the rotary guide tool according to any one of claims 1 to 9 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 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 adjusting device; The inner sleeve of the eccentric shaft is rotated by the target rotation angle to adjust the eccentric angle of the tool.

11. The method according to claim 10, characterized in that Also includes: The state where the maximum thickness of the inner sleeve of the eccentric shaft 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: Wherein, θ is the current tool eccentric angle; A is the distance between the center of the outer diameter of the eccentric shaft and the center of its inner diameter; B is the distance between the center of the outer diameter of the inner sleeve of the eccentric shaft and the center of its inner diameter; L is the distance between the eccentric fulcrum of the drill shaft and the center of the spherical sleeve; Ψ is the rotation angle of the eccentric shaft inner sleeve clockwise compared to the initial state of the eccentric angle adjustment device.

12. The method according to claim 11, characterized in that 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 by an angle Ψ of 0°-180° compared to the initial state of the eccentric angle adjustment device: When Ψ180°-360°: Where Δ is the compensation angle of the tool face angle; A is the distance between the center of the outer diameter of the eccentric shaft and the center of its inner diameter; B is the distance between the center of the outer diameter of the inner sleeve of the eccentric shaft and the center of its inner diameter.

13. The method according to claim 10, characterized in that During the process of rotating the eccentric shaft inner sleeve, observing the first graduation mark of the first angle graduation hole 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 place.

14. The method according to any one of claims 10 to 13, 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.

15. Application of the eccentric angle adjustment device of a rotary steering tool as claimed in any one of claims 1 to 9 in the field of oil and gas drilling technology.

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