Direction-adjustable eccentric casing pipe guiding tool and casing pipe guiding tool control method

Abstract

The invention belongs to the technical field of underground casing pipe guiding, and discloses a direction-adjustable eccentric casing pipe guiding tool and a casing pipe guiding tool control method, which are used for guiding a casing pipe to pass through a drilling well. The direction-adjustable eccentric sleeve guiding tool comprises a shell, a rotating mechanism, an eccentric guiding head, a driving mechanism and a measurement and control mechanism. The measurement and control mechanism can calculate the required rotation angle of the eccentric guide head according to the angle of the central shaft, the axis direction and the position of the stepped obstacle at the moment, and controls the driving mechanism to drive the central shaft to rotate and drive the eccentric guide head to rotate, so that one side, with a larger inclination angle, of the eccentric guide head rotates to the direction of the stepped obstacle; the face with the large inclination angle can easily guide the casing pipe to pass through a stepped obstacle, so that the direction-adjustable eccentric type casing pipe guiding tool and the casing pipe deflect towards the side without the stepped obstacle and are prevented from abutting against the stepped obstacle, the passing ability is enhanced, the working difficulty is reduced, and the construction progress is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of downhole casing guiding, and in particular to an eccentric casing guiding tool with adjustable direction and a casing guiding tool control method. Background Art

[0002] In the exploration of oil and natural gas, mechanical equipment is needed to drill holes from the ground into the formation to form a well to complete underground exploration tasks or the transportation of mineral deposits. After the drilling is completed, it is usually necessary to set a casing in the well. The casing can strengthen the well wall, prevent the wellhead from collapsing, and ensure the safety and smooth progress of underground operations.

[0003] With the mining of mineral deposits, old wells need to be deepened, or new wells need to be casingd to ensure the stability of the wells. However, the casing in the old wells is deformed and dislocated due to stratum movement, or the wellbore of the new well is irregular, which is prone to step obstacles and hinders the passage of the casing. Conventional casing guide shoes have poor passability for step obstacles and are not easy to guide the casing string in, which seriously slows down the construction progress. Summary of the invention

[0004] The object of the present invention is to provide an eccentric casing guide tool with adjustable direction, so as to solve the technical problem that the existing casing guide tool has poor passability for step obstacles.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Adjustable eccentric casing guiding tool, used to guide casing through the wellbore, including:

[0007] A shell body, provided with a first accommodating cavity, one end of which is connected to the sleeve;

[0008] A rotating mechanism is rotatably disposed in the first accommodating chamber, the rotating mechanism comprises a central shaft, the axis of the central shaft and the axis of the shell extend in the same direction, the central shaft is provided with a first flow channel, and the first flow channel can be communicated with the sleeve through the first accommodating chamber;

[0009] An eccentric guide head is arranged at one end of the housing away from the sleeve and fixedly connected to the rotating mechanism. The eccentric guide head is provided with a flow channel group, the flow channel group is connected with the first flow channel, and the eccentric guide head is in an eccentric cone shape;

[0010] A driving mechanism, disposed in the first accommodating cavity, capable of driving the central shaft to rotate around its own axis and driving the eccentric guide head to rotate;

[0011] The measurement and control mechanism is arranged in the first accommodating cavity. The measurement and control mechanism can measure the direction of the axis of the central shaft, and can also measure and control the angle at which the driving mechanism drives the central shaft to rotate around its own axis.

[0012] Preferably, the rotating mechanism also includes a plurality of first bearings and a plurality of support sleeves, the inner ring of the first bearing is connected to the central axis, the outer ring of the first bearing is connected to the cavity wall of the first accommodating cavity, the support sleeve is connected to the central axis, and the support sleeve is arranged on both sides of each first bearing.

[0013] Preferably, the first bearing is a support bearing.

[0014] Preferably, the rotating mechanism also includes a second bearing, a third bearing and a fixed sleeve, the fixed sleeve is arranged between the eccentric guide head and the housing and fixedly connected to the housing, the second bearing is arranged between the fixed sleeve and the supporting sleeve, the inner ring of the second bearing is connected to the center shaft, the outer ring of the second bearing is connected to the housing, the third bearing is arranged between the fixed sleeve and the eccentric guide head, the inner ring of the third bearing is connected to the center shaft, and the outer ring of the third bearing is connected to the fixed sleeve.

[0015] Preferably, the second bearing and the third bearing are both thrust bearings.

[0016] Preferably, the driving mechanism comprises a power supply and a driving member, the power supply and the driving member are both electrically connected to the measurement and control mechanism, the output end of the driving member is connected to the central axis, and the power supply can supply power to the driving member and the measurement and control mechanism.

[0017] Preferably, the measurement and control mechanism includes a control component, a direction measuring instrument and an angle measuring instrument. The direction measuring instrument can measure the direction of the axis of the central shaft, the angle measuring instrument can measure the angle of rotation of the central shaft around its own axis, and the control component can control the angle of rotation of the central shaft driven by the driving mechanism.

[0018] Preferably, a connecting sleeve is further included, and the measurement and control mechanism is connected to the shell through the connecting sleeve. The connecting sleeve is provided with a plurality of through holes, and the axes of the through holes are parallel to the axis of the central axis.

[0019] Preferably, it is characterized in that it further comprises a connecting pipe, the shell is connected to the sleeve via the connecting pipe, and the accommodating cavity and the sleeve are both in communication with the connecting pipe.

[0020] A casing guide tool control method is used to control the above-mentioned adjustable direction eccentric casing guide tool, characterized by comprising:

[0021] Set the target angle ω according to the actual working conditions T ;

[0022] The real-time fixed height side angle ω0 and the current angle ω of the eccentric guide head are determined by the measurement and control mechanism T And well deviation azimuth data ω1;

[0023] By the formula ω=ω T -ω1 calculates the required rotation angle ω of the eccentric guide head in real time;

[0024] When ω≠0, the driving mechanism drives the central shaft to rotate and drives the eccentric guide head to rotate ω;

[0025] When ω=0, the driving mechanism keeps the central axis and the eccentric guide head from rotating.

[0026] Beneficial effects: The present invention provides an adjustable direction eccentric casing guide tool for guiding casing through a well. The adjustable direction eccentric casing guide tool comprises a shell, a rotating mechanism, an eccentric guide head, a measurement and control mechanism, and a driving mechanism. Before lowering the casing, the operator will measure the situation in the well and determine the specific position of the step obstacle. When lowering the casing, the measurement and control mechanism will measure the axial direction of the central axis. When encountering a step obstacle, the measurement and control mechanism will calculate the angle at which the eccentric guide head needs to rotate based on the angle, axial direction, and position of the central axis at this time, and control the driving mechanism to drive the central axis to rotate and drive the eccentric guide head to rotate, so that the side with a larger inclination angle of the eccentric guide head rotates to the direction of the step obstacle. The side with a larger inclination angle can easily guide the casing through the step obstacle, so that the adjustable direction eccentric casing guide tool and the casing are deflected to the side without the step obstacle, avoiding being stuck on the step obstacle, enhancing the passability, reducing the difficulty of work, and accelerating the construction progress.

[0027] The present invention also provides a casing guide tool control method for controlling the above-mentioned adjustable direction eccentric casing guide tool. Through the actual exploration of the wellbore in the early stage of casing operation, the step obstacle position can be determined and the target angle ω can be set. T During the process of lowering the adjustable direction eccentric casing guiding tool into the well, the measurement and control mechanism measures the fixed height side direction angle ω0 and the well inclination azimuth data ω1 in real time, and calculates the required rotation angle ω of the eccentric guiding head according to the above data to rotate the eccentric guiding head, so that the side with a larger inclination of the eccentric guiding head is always facing the side of the step obstacle, so that the adjustable direction eccentric casing guiding tool has a tendency to tilt toward the side away from the step obstacle, which is convenient for the casing to pass through the step obstacle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1is a cross-sectional view of an adjustable direction eccentric casing guide tool provided by an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0030] Figure 3 yes Figure 1 The enlarged view of point B in the middle;

[0031] Figure 4 yes Figure 1 Enlarged view of point C in the middle;

[0032] Figure 5 is a schematic diagram of a casing guiding tool control method provided by an embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the high side direction line and the well bottom circle plane provided by an embodiment of the present invention;

[0034] Figure 7 It is a schematic diagram of calculating the rotation angle of the eccentric guide head on the circular plane at the bottom of the well provided by an embodiment of the present invention.

[0035] In the figure:

[0036] 100, borehole trajectory; 200, plumb line; 300, well bottom circular plane; 400, high side direction line;

[0037] 1. Shell; 11. First accommodating chamber

[0038] 2. Rotating mechanism; 21. Central axis; 211. First flow channel; 22. First bearing; 23. Support sleeve; 24. Second bearing; 25. Third bearing; 26. Fixed sleeve;

[0039] 3. Eccentric guide head; 31. Runner assembly;

[0040] 4. Driving mechanism;

[0041] 5. Measurement and control organization;

[0042] 6. Connecting sleeve; 61. Through hole;

[0043] 7. Connecting pipe. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0049] With the exploitation of mineral deposits, old wells need to be deepened, or new wells need to be casing-run to ensure the stability of the wells. However, due to the deformation and dislocation of the casing in the old wells due to stratum movement and other reasons, or the irregular wellbore of the new wells, step obstacles are prone to occur, hindering the passage of the casing. Conventional casing guide shoes have poor passability for step obstacles, making it difficult to guide the casing string in, which seriously slows down the construction progress. Therefore, this embodiment provides an adjustable direction eccentric casing guide tool to solve the above technical problems.

[0050] refer to Figure 1-Figure 4The embodiment provides an adjustable direction eccentric casing guiding tool, which is used to guide the casing through drilling. The adjustable direction eccentric casing guiding tool comprises a housing 1, a rotating mechanism 2, an eccentric guiding head 3, a measuring and controlling mechanism 5 and a driving mechanism 4. The driving mechanism 4 can drive the rotating mechanism 2 to drive the eccentric guiding head 3 to rotate according to the direction, angle and other data measured by the measuring and controlling mechanism 5, so that the side with a larger inclination of the eccentric guiding head 3 faces the stepped obstacle, making it easier for the casing to pass.

[0051] Specifically, the shell 1 is provided with a first accommodating chamber 11, one end of which is connected to the sleeve; the rotating mechanism 2 is rotatably arranged in the first accommodating chamber 11, the rotating mechanism 2 includes a central axis 21, the axis of the central axis 21 extends in the same direction as the axis of the shell 1, the central axis 21 is provided with a first flow channel 211, and the first flow channel 211 can be connected with the sleeve through the first accommodating chamber 11; the eccentric guide head 3 is arranged at one end of the shell 1 away from the sleeve, and is fixedly connected to the rotating mechanism 2, the eccentric guide head 3 is provided with a flow channel group 31, the flow channel group 31 is connected with the first flow channel 211, and the eccentric guide head 3 is an eccentric cone; the driving mechanism 4 is arranged in the first accommodating chamber 11, the driving mechanism 4 can drive the central axis 21 to rotate around its own axis and drive the eccentric guide head 3 to rotate; the measuring and control mechanism 5 is arranged in the first accommodating chamber 11, the measuring and control mechanism 5 can determine the direction of the axis of the central axis 21, and can also determine and control the angle at which the driving mechanism 4 drives the central axis 21 to rotate around its own axis.

[0052] Before lowering the casing, the operator will measure the situation in the well and determine the specific location of the step obstacle. When lowering the casing, the measurement and control mechanism 5 will measure the axial direction of the central axis 21. When encountering a step obstacle, the measurement and control mechanism 5 will calculate the angle at which the eccentric guide head 3 needs to rotate based on the angle, axial direction and location of the central axis 21 at this time, and control the driving mechanism 4 to drive the central axis 21 to rotate and drive the eccentric guide head 3 to rotate, so that the side with a larger inclination angle of the eccentric guide head 3 rotates to the direction of the step obstacle. The side with a larger inclination angle can easily guide the casing to pass through the step obstacle, so that the adjustable direction eccentric casing guiding tool and the casing are deflected to the side without the step obstacle, avoiding being stuck on the step obstacle, thereby enhancing the passability, reducing the difficulty of work, and accelerating the construction progress.

[0053] Furthermore, the adjustable direction eccentric casing guiding tool also includes a connecting pipe 7, and the shell 1 is connected to the casing through the connecting pipe 7, so that the adjustable direction eccentric casing guiding tool is tightly and firmly connected to the casing, and the accommodating chamber and the casing are both connected to the connecting pipe 7, so that the drilling fluid can smoothly enter the accommodating chamber.

[0054] Specifically, the rotating mechanism 2 also includes a plurality of first bearings 22 and a plurality of support sleeves 23. The inner ring of the first bearing 22 is connected to the central axis 21, and the outer ring of the first bearing 22 is connected to the cavity wall of the first accommodating cavity 11, so that the central axis 21 is tightly connected to the shell 1 and the axis of the central axis 21 can coincide with the axial direction of the shell 1, so that the rotation of the central axis 21 is smoother. The support sleeve 23 is connected to the central axis 21, and support sleeves 23 are arranged on both sides of each first bearing 22. The support sleeve 23 is used to position and support the bearing to prevent the bearing from moving along the central axis 21 and affecting the rotation effect.

[0055] There is no limitation on the specific type of the first bearing 22 . In the present embodiment, the first bearing 22 is a support bearing, which can withstand a large axial load and convert it into a radial load, thereby ensuring the stability and smooth rotation of the center shaft 21 .

[0056] Furthermore, the rotating mechanism 2 also includes a second bearing 24, a third bearing 25 and a fixed sleeve 26. The fixed sleeve 26 is arranged between the eccentric guide head 3 and the shell 1, and is fixedly connected to the shell 1. The second bearing 24 is arranged between the fixed sleeve 26 and the support sleeve 23. The inner ring of the second bearing 24 is connected to the central shaft 21, and the outer ring of the second bearing 24 is connected to the shell 1. The second bearing 24 and the fixed sleeve 26 can better stabilize the rotating mechanism 2, so that the rotating mechanism 2 is stably connected to the shell 1 to avoid displacement. The third bearing 25 is arranged between the fixed sleeve 26 and the eccentric guide head 3. The inner ring of the third bearing 25 is connected to the central shaft 21, and the outer ring of the third bearing 25 is connected to the fixed sleeve 26. The third bearing 25 can reduce the friction between the eccentric guide head 3 and the fixed sleeve 26.

[0057] There is no limitation on the specific types of the second bearing 24 and the third bearing 25 . In the present embodiment, the second bearing 24 and the third bearing 25 are thrust bearings, which can effectively withstand the thrust of the eccentric guide head 3 when passing through a stepped obstacle, thereby ensuring the stable operation of the rotating mechanism 2 .

[0058] Specifically, the driving mechanism 4 includes a power supply and a driving member. Both the power supply and the driving member are electrically connected to the measurement and control mechanism 5. The output end of the driving member is connected to the central axis 21. The power supply can supply power to the driving member and the measurement and control mechanism 5. During operation, the driving member can rotate the central axis 21 and the eccentric guide head 3 according to the direction, angle and other data measured by the measurement and control mechanism 5.

[0059] There is no limitation on the specific type of the driving component. In the present embodiment, the driving component is a servo motor, which can accurately control the rotation of the central shaft 21 according to the electrical signal of the measurement and control mechanism 5, thereby realizing accurate control of the eccentric guide head 3.

[0060] Specifically, the measurement and control mechanism 5 includes a control component 51, a direction measuring instrument 52 and an angle measuring instrument 53. The direction measuring instrument 52 can measure the direction of the axis of the central shaft 21, and the angle measuring instrument 53 can measure the angle of rotation of the central shaft 21 around its own axis. The control component 51 can control the driving mechanism 4 to drive the central shaft 21 to rotate at an angle. The control component 51 calculates the required rotation angle of the central shaft 21 through the above-mentioned angle and direction data and controls the driving mechanism 4 to rotate the central shaft 21 to a corresponding angle.

[0061] There is no limitation on the specific type of the control component 51. In the present embodiment, the control component 51 is a stm32 single-chip microcomputer capable of fast calculation and precise control.

[0062] There is no limitation on the specific type of the direction finder 52. In the present embodiment, the direction finder 52 is a gyroscope, which can accurately measure the axis of the central axis 21. In other embodiments, it can also be a flux gate for drilling orientation, or other instruments that can measure the well inclination and azimuth.

[0063] The specific type of the angle measuring instrument 53 is not limited here. In the present embodiment, the angle measuring instrument 53 is a rotation angle sensor.

[0064] Furthermore, the adjustable direction eccentric casing guiding tool also includes a connecting sleeve 6, through which the measuring and control mechanism 5 is connected to the shell 1 to ensure that the connection between the measuring and control mechanism 5 and the shell 1 is stable. The connecting sleeve 6 is provided with a plurality of through holes 61, and the axis of the through hole 61 is parallel to the axis of the central axis 21, so that the drilling fluid can smoothly pass through the accommodating chamber, the first flow channel 211 and the flow channel group 31.

[0065] refer to Figure 5-Figure 7 This embodiment also provides a casing guide tool control method for controlling the above-mentioned adjustable direction eccentric casing guide tool. The casing guide tool control method includes:

[0066] Set the target angle ω according to the actual working conditions T ;

[0067] The adjustable direction eccentric casing guide tool is lowered into the well, and the real-time high side direction angle ω0 and the well inclination azimuth data ω1 are measured by the measurement and control mechanism 5;

[0068] By the formula ω=ω T -ω1 calculates the required rotation angle ω of the eccentric guide head 3. When ω≠0, the driving mechanism 4 drives the central shaft 21 to rotate and drives the eccentric guide head 3 to rotate ω until ω=0;

[0069] When ω=0, the driving mechanism 4 keeps the central shaft 21 and the eccentric guide head 3 from rotating.

[0070] Through the actual exploration of the well in the early stage of casing operation, the location of the step obstacle can be determined and the target angle ω can be set. T During the process of lowering the adjustable direction eccentric casing guiding tool into the well, the measurement and control mechanism 5 measures the fixed height side direction angle ω0 and the well inclination azimuth data ω1 in real time, and calculates the required rotation angle ω of the eccentric guiding head 3 according to the above data, and rotates the eccentric guiding head 3, so that the side with a larger inclination of the eccentric guiding head 3 is always facing the side of the step obstacle, so that the adjustable direction eccentric casing guiding tool has a tendency to tilt toward the side away from the step obstacle, which is convenient for the casing to pass through the step obstacle.

[0071] Specifically, refer to Figure 2 Since the borehole trajectory 100 (the axis of the drilling) is not perpendicular to the horizontal plane, the bottom hole circular plane 300 needs to be measured to accurately calculate the required rotation angle ω of the eccentric guide head 3. In the casing operation, the axis of the adjustable direction eccentric casing guide tool coincides with the borehole trajectory 100, so the direction of the axis of the central axis 21 measured by the direction measuring instrument 52 is taken as the borehole trajectory 100, and the plane perpendicular to the axis of the central axis 21 is the bottom hole circular plane 300; on the bottom hole circular plane 300, the plumb line 200 and the bottom hole circular plane 300 have a first intersection, the borehole trajectory 100 and the bottom hole circular plane 300 have a second intersection, and the straight line where the first intersection and the second intersection are located is the high side direction line 400, and the direction pointed by the high side direction line 400 is the high side direction angle ω0, and ω0 is 0 degrees on the bottom hole circular plane 300, and the subsequent angle measurements are all based on ω0.

[0072] Specifically, before the casing operation is performed, the well is first explored to determine the specific location of the step obstacle; then, according to the specific location of the detected step obstacle, the target angle ω is set by the control element 51. T ,ω T When the adjustable eccentric casing guiding tool encounters a step obstacle, the side with a larger inclination of the eccentric guiding head 3 should face the position; after setting the relevant data, the adjustable eccentric casing guiding tool is lowered into the wellbore, at which time the direction measuring instrument 52 will measure the side direction angle ω0 and the well inclination azimuth data ω1 in real time, and the current angle ω of the eccentric guiding head 3 will be measured by the angle measuring instrument 53 T , the control element 51 is controlled by the formula ω=ω T-ω1 calculates the required rotation angle ω of the eccentric guide head 3 and sends a signal to the driver. The driver receives the signal and drives the central shaft 21 to drive the eccentric guide head 3 to rotate ω degrees, so that the side with a larger inclination faces the step obstacle. During the control process, the measurement and control mechanism 5 measures data in real time and adjusts the angle of the eccentric guide head 3. When the eccentric guide head 3 is at the most suitable angle, the direction of the eccentric guide head 3 is maintained, so that the eccentric guide head 3 can always be at the most suitable angle for the adjustable direction eccentric casing guide tool to pass through the step obstacle, which greatly reduces the difficulty of the operation and effectively improves the construction efficiency.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An adjustable eccentric casing guide tool for guiding casing through a wellbore, characterized in that: include: The housing (1) is provided with a first accommodating chamber (11), one end of which is connected to the sleeve; a rotating mechanism (2) rotatably disposed in the first accommodating chamber (11), the rotating mechanism (2) comprising a central shaft (21), the axis of the central shaft (21) extending in the same direction as the axis of the housing (1), the central shaft (21) being provided with a first flow channel (211), the first flow channel (211) being able to communicate with the sleeve through the first accommodating chamber (11); An eccentric guide head (3) is arranged at one end of the housing (1) away from the sleeve and fixedly connected to the rotating mechanism (2); the eccentric guide head (3) is provided with a flow channel group (31), the flow channel group (31) is connected to the first flow channel (211), and the eccentric guide head (3) is in an eccentric cone shape; A driving mechanism (4) is arranged in the first accommodating chamber (11), and the driving mechanism (4) is capable of driving the central shaft (21) to rotate around its own axis and driving the eccentric guide head (3) to rotate; The measurement and control mechanism (5) is arranged in the first accommodating cavity (11), and the measurement and control mechanism (5) can measure the direction of the axis of the central axis (21), and can also measure and control the angle at which the driving mechanism (4) drives the central axis (21) to rotate around its own axis.

2. The adjustable direction eccentric casing guide tool according to claim 1, characterized in that: The rotating mechanism (2) further comprises a plurality of first bearings (22) and a plurality of support sleeves (23), wherein the inner ring of the first bearing (22) is connected to the central shaft (21), the outer ring of the first bearing (22) is connected to the cavity wall of the first accommodating cavity (11), the support sleeve (23) is connected to the central shaft (21), and the support sleeve (23) is provided on both sides of each first bearing (22).

3. The adjustable direction eccentric casing guide tool according to claim 2, characterized in that: The first bearing (22) is a support bearing.

4. The adjustable direction eccentric casing guide tool according to claim 2, characterized in that: The rotating mechanism (2) further comprises a second bearing (24), a third bearing (25) and a fixed sleeve (26); the fixed sleeve (26) is arranged between the eccentric guide head (3) and the housing (1), and is fixedly connected to the housing (1); the second bearing (24) is arranged between the fixed sleeve (26) and the support sleeve (23); the inner ring of the second bearing (24) is connected to the central shaft (21); the outer ring of the second bearing (24) is connected to the housing (1); the third bearing (25) is arranged between the fixed sleeve (26) and the eccentric guide head (3); the inner ring of the third bearing (25) is connected to the central shaft (21); and the outer ring of the third bearing (25) is connected to the fixed sleeve (26).

5. The direction-adjustable eccentric casing guide tool according to claim 4, characterized in that: The second bearing (24) and the third bearing (25) are both thrust bearings.

6. The direction-adjustable eccentric casing guide tool according to claim 1, characterized in that: The driving mechanism (4) comprises a power supply and a driving member, the power supply and the driving member are both electrically connected to the measurement and control mechanism (5), the output end of the driving member is connected to the central axis (21), and the power supply can supply power to the driving member and the measurement and control mechanism (5).

7. The direction-adjustable eccentric casing guide tool according to claim 6, characterized in that: The measurement and control mechanism (5) comprises a control component (51), a direction measuring instrument (52) and an angle measuring instrument (53); the direction measuring instrument (52) is capable of measuring the direction of the axis of the central axis (21); the angle measuring instrument (53) is capable of measuring the angle at which the central axis (21) rotates around its own axis; and the control component (51) is capable of controlling the angle at which the driving mechanism (4) drives the central axis (21) to rotate.

8. The direction-adjustable eccentric casing guide tool according to claim 1, characterized in that: It also comprises a connecting sleeve (6), the measuring and controlling mechanism (5) is connected to the housing (1) via the connecting sleeve (6), the connecting sleeve (6) is provided with a plurality of through holes (61), and the axes of the through holes (61) are parallel to the axis of the central axis (21).

9. The direction-adjustable eccentric casing guiding tool according to any one of claims 1 to 8, characterized in that: It also comprises a connecting pipe (7), the shell (1) is connected to the sleeve via the connecting pipe (7), and the accommodating cavity and the sleeve are both in communication with the connecting pipe (7).

10. A casing guide tool control method, used to control the direction-adjustable eccentric casing guide tool according to any one of claims 1 to 9, characterized in that: include: Set the target angle ω according to the actual working conditions T ; The real-time fixed height side direction angle ω0 and the current angle ω of the eccentric guide head (3) are measured by the measurement and control mechanism (5). T And well deviation azimuth data ω1; By the formula ω=ω T -ω1 calculates the required rotation angle ω of the eccentric guide head (3) in real time; When ω≠0, the driving mechanism (4) drives the central shaft (21) to rotate and drives the eccentric guide head (3) to rotate ω; When ω=0, the driving mechanism (4) keeps the central shaft (21) and the eccentric guide head (3) from rotating.

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