Pushing executing mechanism, well drilling guiding tool and well drilling system

Abstract

The invention relates to a pushing executing mechanism which comprises a driving element, an executing element and a pushing protecting plate assembly, the pushing protecting plate assembly comprises a plurality of protecting plate single bodies (1) which are sequentially arranged, every two adjacent protecting plate single bodies (1) are rotatably connected, and each protecting plate single body (1) is provided with a first side and a second side which are oppositely arranged; the execution elements are correspondingly arranged on the first sides of the protection plate single bodies (1), and the driving elements are used for driving the execution elements, so that the execution elements drive the protection plate single bodies (1) to move towards the side where the second sides are located. The contact area of the pushing executing mechanism and the well wall is large, and large lateral pushing force can be improved. In addition, the invention further relates to a well drilling guiding tool and a well drilling system.

Description

TECHNICAL FIELD

[0001] The present application relates to a drilling tool, in particular, to a push-off actuator. BACKGROUND

[0002] The static push-off rotary drilling system is a common rotary steering drilling system, and the static push-off is usually driven by hydraulic pressure to drive the push-off guard to push against the well wall to generate a lateral pushing force, and the resultant force of the pushing force supported by the well wall through a plurality of push-off guards uniformly distributed around the axial direction of the drilling system is directed to the low side to prevent and correct the inclination.

[0003] A part of the push-off guard in the prior art is pushed to move to the side by a hydraulic cylinder, so that the push-off guard pushes against the well wall, but the outer surface of the push-off guard cannot be adaptively adjusted according to the shape of the well wall, and the fit is poor when dealing with complex well conditions, so that the push-off guard and the well wall cannot be effectively contacted, resulting in a small contact area between the push-off guard and the well wall, and the push-off guard cannot provide sufficient lateral pushing force. The other end of the push-off guard is hinged to the push-off mechanism housing, and the movable end is rotated by a certain angle outward under the pushing of the piston cylinder, so that the movable end of the push-off guard pushes against the well wall. The improvement of this kind of push-off guard is to set the outer surface of the movable end of the push-off guard as a multi-arc surface structure, adjust the stroke of the piston cylinder according to the shape of the well wall, and rotate the push-off guard by a certain angle, so that the arc surface corresponding to the shape of the well wall in the multi-arc surface structure pushes against the well wall, and the fit is high. However, the design of the multi-arc surface structure results in a small area of each arc surface, thereby resulting in a small contact area, and the push-off guard cannot provide sufficient lateral pushing force. In the layer with large inclination angle, the interlayer and interlayer are more, and the vibration generated during drilling is strong. If the push-off guard cannot effectively support the well wall, the outer cylinder of the steering head will rotate irregularly with the drilling tool, which not only affects the inclination measurement of the vertical drilling tool, but also cannot achieve the purpose of inclination control.

[0004] Therefore, it is necessary to design a push-off actuator with a large contact area with the well wall and capable of providing a large lateral pushing force. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a push-off actuator with a large contact area with the well wall and capable of providing a large lateral pushing force.

[0006] Further, the technical problem to be solved by the present application is to provide a drilling steering tool with a push-off guard having a large contact area with the well wall and capable of providing a large lateral pushing force.

[0007] Further, the technical problem to be solved by the present application is to provide a drilling system with a push-off guard having a large contact area with the well wall and capable of providing a large lateral pushing force.

[0008] To solve the above-mentioned technical problems, the present invention provides a pushing actuator, which includes a driving element, a pushing guard plate assembly, and an actuator. The pushing guard plate assembly includes a plurality of guard plate units arranged in sequence, and two adjacent guard plate units are rotatably connected. Each guard plate unit has a first side and a second side arranged opposite to each other. The actuator is correspondingly provided on the first side of each guard plate unit. The driving element is used to drive the actuator so that the actuator drives the guard plate unit to move toward the side where the second side is located.

[0009] Preferably, the push-back guard plate assembly further includes a connecting plate, and two adjacent guard plate units are rotatably connected through the connecting plate.

[0010] Specifically, the driving element includes a motor, a hydraulic pump, and an oil tank; the actuating element includes a hydraulic cylinder; the telescopic end of the hydraulic cylinder is disposed on the first side of the guard plate unit; the motor is used to drive the hydraulic pump; the oil tank is connected to the hydraulic cylinder through the hydraulic pump; and the motor is used to drive the hydraulic pump so that the hydraulic pump supplies / returns oil to the hydraulic cylinder.

[0011] Preferably, the push-actuator further includes an adapter module, which includes an electrical connector and a pin. One end of the pin is used to electrically connect to an external circuit, and the other end is electrically connected to the motor through the electrical connector.

[0012] Specifically, the pushing actuator further includes a housing, which forms an inner cavity and a hydraulic cylinder support. The driving element and the adapter module are disposed in the inner cavity of the housing. The fixed end of the hydraulic cylinder is mounted on the hydraulic cylinder support. The first side of the guard plate unit abuts against the telescopic end of the hydraulic cylinder.

[0013] Preferably, the push-actuating mechanism further includes a first seal and a second seal, wherein the first seal is sealed between the pin and the wall of the housing cavity, and the second seal is sealed between the motor and the wall of the housing cavity.

[0014] Preferably, the housing includes a first housing, a second housing, and a hydraulic cylinder support seat connected in sequence. The first housing, the second housing, and the hydraulic cylinder support seat cooperate to form the inner cavity of the housing. The second seal includes a motor bushing and a pair of first sealing rings. The motor bushing is sleeved at the connection between the electrical connector and the motor. The outer surface of the motor bushing forms a pair of mounting annular grooves for installing the first sealing rings, so that the pair of first sealing rings are respectively disposed on both sides of the connection gap between the first housing and the second housing along the length direction of the housing.

[0015] Preferably, the non-connecting ends of the guard plate units at both ends of the push-back guard plate assembly are formed with stop step surfaces, and the housing is formed with a limiting step surface at the position corresponding to the stop step surface. The stop step surface and the limiting step surface can stop each other to limit the movement stroke of the guard plate unit towards the side where the second side is located.

[0016] Preferably, the pushing actuator further includes an elastic element disposed between the stop step surface and the limiting step surface to provide an elastic force that drives the guard plate unit to move toward the side where the first side is located.

[0017] Preferably, the driving element further includes a reducer, the motor is a brushless DC motor, and the brushless DC motor is connected to the hydraulic pump through the reducer.

[0018] Preferably, the hydraulic cylinder is a plunger cylinder, and a filter is provided in the hydraulic oil circuit between the hydraulic pump and the plunger cylinder.

[0019] Preferably, the push-back guard assembly includes two guard units, with one end of the two guard units away from the connecting plate forming an inclined section, and the outer surface of the inclined section gradually inclined from one end near the connecting plate toward the opposite end toward the side near the actuating element.

[0020] Based on the technical solution of the push-and-pull actuator of the present invention, the present invention also provides a drilling guidance tool, which includes the push-and-pull actuator described in any of the above technical solutions.

[0021] Based on the technical solution of the drilling guidance tool of the present invention, the present invention also provides a drilling system, which includes the drilling guidance tool described in any of the above technical solutions.

[0022] Through the above technical solution, the push-back plate assembly of the push-back actuator of the present invention is composed of multiple plate units arranged in sequence. Adjacent plate units are rotatably connected. The driving element can drive the actuator, so that the actuator pushes the push-back plate assembly. When the actuator pushes the outer surface of the push-back plate assembly to contact the well wall, according to the smoothness of the well shaft, the multiple plate units can rotate around their mutual rotation axis, so that the shape of the outer surface of the push-back plate assembly composed of multiple plate units is more adapted to the shape of the well wall surface, thereby increasing the contact area between the push-back plate assembly and the well wall to provide a greater lateral pushing force.

[0023] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the push-to-actuate mechanism according to a specific embodiment of the present invention;

[0025] Figure 2 This is a structural schematic diagram of the actuator and push-back guard plate assembly in a specific embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Protective plate unit 2. Connecting plate

[0028] 3 motors and 4 hydraulic pumps

[0029] 5 hydraulic cylinders and 6 reducers

[0030] 7. Housing 701 Hydraulic Cylinder Support

[0031] 702 First casing 703 Second casing

[0032] 8. Inner cavity of the housing; 9. Stop step surface

[0033] 10 Limiting step surface 11 Elastic element

[0034] 12 Filter 13 Throttling Valve

[0035] 14 Electrical connectors 15 Pins

[0036] 16 First seal 17 Second seal

[0037] 18 Motor bushing 19 First sealing ring

[0038] 20 Install annular groove 21 Safety valve

[0039] 22 Circular sealing structure 23 Groove

[0040] 24 Second sealing ring 25 Dustproof cap

[0041] 26 inclined sections Detailed Implementation

[0042] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0043] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0044] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0045] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0046] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0047] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0048] like Figure 1As shown, the pushing actuator of the present invention includes a driving element, an actuator, and a pushing guard plate assembly. The pushing guard plate assembly includes a plurality of guard plate units 1 arranged sequentially. Adjacent guard plate units 1 are rotatably connected. Each guard plate unit 1 has a first side and a second side arranged opposite to each other. An actuator is correspondingly provided on the first side of each guard plate unit 1. The driving element is used to drive the actuator so that the actuator drives the guard plate unit 1 to move towards the side where the second side is located. In actual operation, the second side is the side where the well wall is located. Thus, under the push of the actuator, the guard plate unit 1 moves towards the side where the second side is located so that the surface of the second side of the guard plate unit 1 contacts the well wall. Since there are multiple guard plate units 1 The components are rotatably connected. After the push-and-adhesion plate assembly contacts the well wall, the multiple plate units 1 can rotate slightly around their respective rotation axes according to the smoothness of the well wall. This allows the second side surface of the push-and-adhesion plate assembly to match the shape of the well wall, achieving a tight fit between the second side surface of the push-and-adhesion plate assembly and the well wall. Furthermore, as the push-and-adhesion plate assembly moves, the multiple plate units 1 can adaptively rotate slightly to achieve continuous and effective contact with the well wall. Thus, during drilling, the push-and-adhesion actuator can maintain a large contact area with the well wall, enhancing the pushing force. Even in complex drilling conditions, it can still effectively achieve the purpose of deviation control and reduce the accident rate during complex operations.

[0049] As a preferred implementation method, such as Figure 1 As shown, the push-back guard plate assembly also includes a connecting plate 2. Two adjacent guard plate units 1 are rotatably connected by the connecting plate 2. In this embodiment, one guard plate unit 1 is hinged to each end of the connecting plate 2. The length of the connecting plate 2 is less than the length of the guard plate unit 1. The actuator pushes the guard plate unit 1 to move to the side where the second side is located. The guard plate unit 1 drives the connecting plate 2 to move to the side where the second side is located. After the outer surface of the push-back guard plate assembly contacts the well wall, multiple guard plate units 1 can adaptively twist slightly, driving the connecting plate 2 to twist slightly. The connecting plate 2 provides a transition for the guard plate units 1 on both sides, making the bend of the second side surface of the push-back guard plate assembly smoother. This is beneficial to further increase the contact area between the second side surface of the push-back guard plate assembly and the well wall, and increase the lateral thrust of the push-back actuator.

[0050] As a specific implementation method, such as Figure 1 As shown, the driving elements of this embodiment include a motor 3, a hydraulic pump 4, and an oil tank (not shown in the figure). The actuating element includes a hydraulic cylinder 5. The extension and retraction end of the hydraulic cylinder 5 is disposed on the first side of the guard plate unit 1. The motor 3 is used to drive the hydraulic pump 4. The oil tank is connected to the hydraulic cylinder 5 through the hydraulic pump 4. The motor 3 is used to drive the hydraulic pump 4 so that the hydraulic pump 4 controls the hydraulic cylinder 5 to supply / return oil, thereby driving the extension and retraction end of the hydraulic cylinder 5 to perform an extension or retraction action.

[0051] As a preferred implementation method, such asFigure 1 As shown, the push-pull actuator in this embodiment also includes a conversion module, which includes an electrical connector 14 and a pin 15. One end of the pin 15 is used to electrically connect to an external circuit, and the other end is electrically connected to the motor 3 through the electrical connector 14. The conversion module enables the electrical connection between the motor 3 and the external circuit, which includes a control component and a drill string information acquisition component. The drill string information acquisition component can collect drill string information, such as the current drilling tool tilt angle and wellbore flatness. The control component sends a control signal based on the collected drill string information. The control signal controls the motor 3 through the conversion module, thereby controlling the extension and retraction of the hydraulic cylinder 5. This conversion module also facilitates the installation and replacement of the push-pull actuator.

[0052] As a specific implementation method, such as Figure 1 As shown, the pushing actuator of this embodiment also includes a housing 7, which has an inner cavity 8. The adapter module and the drive element are disposed in the inner cavity 8. A hydraulic cylinder support 701 is formed at the end of the housing 7 away from the adapter module. The fixed end of the hydraulic cylinder 5 is mounted on the hydraulic cylinder support 701, and the telescopic end of the hydraulic cylinder 5 abuts against the first side surface of the guard plate unit 1. The housing 7 encapsulates the drive element and the adapter module, preventing mud and impurities from contacting the drive element and the adapter module, thus extending the service life of the pushing actuator. Furthermore, in this embodiment, the adapter module and the drive element are sequentially arranged in the inner cavity 8 along the length of the housing 7, resulting in a smaller radial space occupation of the pushing actuator.

[0053] As a preferred implementation method, such as Figure 1As shown, the push-to-actuate mechanism of this embodiment also includes a first seal 16 and a second seal 17. The first seal 16 of this embodiment includes a circular sealing structure 22 and a second sealing ring 24. A through hole is formed in the middle of the circular sealing structure 22. The pin 15 passes through the through hole. The electrical connector 14 is electrically connected to the pin 15 through a wire and then electrically connected to the external circuit through the pin 15. The outer surface of the circular sealing structure 22 contacts the inner wall of the housing 7, and a sealing ring mounting groove for installing the second sealing ring 24 is opened on the outer peripheral surface of the circular sealing structure 22 to achieve sealing between the adapter module and the external circuit, preventing mud and impurities from entering. In a preferred case, multiple layers of second sealing rings 24 can be installed on the circular sealing structure 22 to improve its sealing performance. In this embodiment, the second seal 17 is fitted at the connection between the electrical connector 14 and the motor 3. The outer surface of the second seal 17 contacts the inner wall of the housing 7 to achieve a seal between the motor 3 and the inner wall of the housing 7. The second seal 17 divides the inner cavity 8 of the housing into a first inner cavity for accommodating the adapter module and a second inner cavity for accommodating the drive element, thereby isolating the circuit and hydraulic oil. The first seal 16, the second seal 17 and the housing 7 cooperate to isolate the internal circuit of the push-to-actuate mechanism from the external environment. Thus, this embodiment can prevent oil and mud from contacting the circuit of the adapter module, avoid damage to the adapter module, and improve the reliability of the push-to-actuate mechanism.

[0054] As a preferred implementation method, such as Figure 1 As shown, the housing includes a first housing 702, a second housing 703, and a hydraulic cylinder support 701 connected in sequence. The first housing 702, the second housing 703, and the hydraulic cylinder support 701 cooperate to form the housing cavity 8. The housing 7 is configured with a multi-segment structure to facilitate the installation of the adapter module and drive components. A hydraulic cylinder support surface is formed on the hydraulic cylinder support 701. The second seal 17 includes a motor bushing 18 and a first sealing ring 19. The motor bushing 18 is fitted onto the connection between the electrical connector 14 and the motor 3. The outer surface of the motor bushing 18 forms two sealing rings for mounting the second... The mounting ring groove 20 of the sealing ring 19, in one mounting ring groove 20, the first sealing ring 19 is used to seal the gap between the motor bushing 18 and the first housing 702, and the first sealing ring 19 in the other mounting ring groove 20 is used to seal the gap between the motor bushing 18 and the second housing 703. Thus, the gaps between the first housing 702 and the motor 3 and between the second housing 703 and the motor 3 are sealed by the motor bushing 18 and the two first sealing rings 19, so as to prevent mud from entering the inner cavity 8 of the housing from the connection gap between the first housing 702 and the second housing 703.

[0055] As a preferred implementation method, such as Figure 1As shown, the non-connecting ends of the guard plate units 1 at both ends of the push-back guard plate assembly are formed with stop step surfaces 9. The housing 7 is formed with a limiting step surface 10 at the position corresponding to the stop step surface 9. The stop step surface 9 and the limiting step surface 10 can stop each other to limit the movement stroke of the guard plate unit 1 to the side where the second side is located, so as to prevent the push-back guard plate assembly from falling off when the push-back actuator is handled and installed.

[0056] As a preferred implementation method, such as Figure 1 and Figure 2 As shown, the pushing actuator also includes an elastic element 11, which can be a spring, a rubber component, or an elastic steel plate, but is not limited to these. In this embodiment, the elastic element 11 is a spring, which is disposed between the stop step surface 9 and the limit step surface 10 to provide a spring force to drive the guard plate unit 1 to move towards the side where the first side is located. In some specific embodiments, the hydraulic cylinder 5 is a piston cylinder. When the piston cylinder stops pushing the pushing guard plate assembly, the elastic elements 11 on both sides of the pushing guard plate assembly can provide a force toward the actuator to the pushing guard plate assembly, so that the pushing guard plate assembly is pressed back.

[0057] As a preferred implementation method, such as Figure 1 As shown, the driving element also includes a reducer 6. The motor 3 is a brushless DC motor, which is connected to the hydraulic pump 4 through the reducer 6. In this embodiment, the brushless DC motor is connected to an external circuit through an adapter module. The control component in the external circuit can control the brushless DC motor through PID control. The brushless DC motor drives the hydraulic pump 4, forming a pressure closed-loop control. The hydraulic pump 4 drives the hydraulic cylinder 5 to extend and retract. In this embodiment, the use of a brushless DC motor facilitates speed adjustment. However, the brushless DC motor directly connected to the hydraulic pump 4 has insufficient torque at low speeds, resulting in unstable speed under load. This causes significant fluctuations in the pressure generated by the hydraulic pump 4, which in turn leads to the hydraulic push output force not effectively supporting the well wall. Therefore, a reducer 6 is also provided between the brushless DC motor and the hydraulic pump 4 to reduce the speed and increase the torque, thereby improving the stability and reliability of the hydraulic pump 4 output. In some specific embodiments, the reducer 6 adopts a 1:3 transmission ratio, which can solve the problem of insufficient torque of the brushless DC motor at low speed and cause pressure instability, effectively giving full play to the performance of the brushless DC motor. After reading the technical solution of this application, those skilled in the art can make adaptive adjustments to the transmission according to the actual situation. The transmission ratio of the reducer 6 is not limited to the above values, and will not be elaborated here.

[0058] As a preferred implementation method, such as Figure 1As shown, the hydraulic cylinder 5 in this embodiment is a plunger cylinder. The plunger extends radially relatively smoothly, providing a relatively stable output force and having a low cost. However, it requires high cleanliness of the hydraulic oil in the oil circuit. Therefore, a filter 12 is installed in the hydraulic oil circuit between the hydraulic pump 4 and the plunger cylinder to reduce the failure risk of the push-pull actuator and improve its service life. In some embodiments, a groove 23 is formed on the first side surface of the guard plate unit 1 at the position corresponding to the plunger. The shape of the groove 23 is adapted to the shape of the abutment end of the plunger. In other embodiments, the abutment end of the plunger and the groove 23 are set to be spherical or arc-shaped, so that the guard plate unit 1 can maintain a large contact area with the groove 23 during the rotation of the guard plate unit 1 around the hinge axis, thereby ensuring that the plunger cylinder can stably apply thrust to the push-pull guard plate assembly.

[0059] In a preferred embodiment, the plunger of the plunger cylinder is installed in the plunger cylinder through a sealing ring, and a dust cap 25 is installed on the end of the plunger near the protective plate unit 1 to prevent mud and impurities from entering during operation, thereby reducing the failure rate of the hydraulic components and reducing maintenance pressure. Figure 1 As shown, when the plunger cylinder extends radially along the push-actuator under the action of high-pressure oil, the plunger drives the dust cap 25 to contact the inner surface of the guard plate unit 1, forming a lateral thrust. In some embodiments, the outer surface shape of the dust cap 25 is adapted to the shape of the groove 23. A protrusion can be provided on the outer surface of the dust cap 25 corresponding to the position of the groove 23. The shape of the protrusion can be set as spherical or arc-shaped to ensure effective contact between the guard plate unit 1 and the dust cap 25.

[0060] As a preferred implementation method, such as Figure 1 As shown, the push-fit plate assembly of this embodiment includes two plate units 1, which are respectively hinged to both ends of the connecting plate 2. The push-fit plate assembly of this embodiment is configured as a three-section structure. When the plunger pushes the push-fit plate assembly against the well wall, the plate unit 1 and the connecting plate 2 can only rotate around the hinge axis, thus preventing them from forming an "M" shape. This ensures that the outer surface of the push-fit plate assembly contacts the well wall. Moreover, this embodiment can still maintain a good contact effect under the influence of strong downhole vibration.

[0061] As a preferred implementation method, such as Figure 1 As shown, the ends of the two guard plate units 1 away from the connecting plate 2 form an inclined section 26. The outer surface of the inclined section 26 gradually tilts from the end near the connecting plate 2 toward the opposite end toward the side near the actuator. Thus, when the push guard plate assembly moves along the well wall with low smoothness, the inclined section 26 can reduce the impact on the push guard plate assembly, reduce the wear of the push guard plate assembly, and extend the service life of the push guard plate assembly.

[0062] As a preferred implementation method, such asFigure 1 As shown, in this embodiment, one drive element is connected to multiple hydraulic cylinders 5. When the thrust output by the actuator to the push plate assembly remains unchanged, the contact area between the actuator and the push plate assembly is increased by setting multiple hydraulic cylinders. As a result, the power required to be output by the motor 3 and the hydraulic pump 4 is lower, which reduces the pressure in the push actuator and lowers the accident rate.

[0063] To better understand the technical solution of the present invention, the following description is provided in conjunction with relatively preferred technical features, such as... Figure 1As shown, the present invention provides a preferred push-pull actuator. This embodiment of the push-pull actuator includes a push-pull guard plate assembly, a drive element, an actuator, a transfer module, a housing 7, a first seal 16, and a second seal 17. The actuator includes two plunger cylinders. The housing 7 includes a hydraulic cylinder support 701, a first housing 702, and a second housing 703. The first housing 702 forms a first internal cavity, and the second housing 703 forms a second internal cavity. The first housing 702 and the hydraulic cylinder support 701 are respectively mounted at both ends of the second housing 703 along its length, so that the first and second internal cavities cooperate to form a housing inner cavity 8. A hydraulic cylinder support surface is formed on the hydraulic cylinder support 701, and two mounting grooves for mounting the plunger cylinders are formed along the length of the hydraulic cylinder support surface. This allows the fixed end of the plunger cylinder to be stably mounted on the hydraulic cylinder support 701. A push-back guard plate assembly is provided on one side of the extension end of the plunger cylinder. A dustproof cap 25 is installed on the end face of the extension end of the plunger cylinder. The dustproof cap 25 includes a dustproof cap body and a cap sleeve. The cap body is located at the extension end of the plunger. The cap sleeve connects the cap body and the bottom of the plunger cylinder to seal the plunger and prevent mud and impurities from entering. During the extension of the plunger, the dustproof cap body moves, and the cap sleeve can unfold or stretch to maintain the seal of the plunger. The push-back guard plate assembly includes two guard plate units 1 and a connecting plate 2. The length of the connecting plate 2 is less than the length of the guard plate unit 1. The second side surfaces of both the guard plate unit 1 and the connecting plate 2 are provided with wear-resistant layers. The two guard plate units 1 are respectively hinged to both ends of the connecting plate 2. A plunger cylinder is provided on the inner side of each of the two guard plate units 1. A groove 23 is formed on the inner side of the guard plate unit 1 at the position corresponding to the plunger of the plunger cylinder. The shape of the groove 23 corresponds to the end face shape of the extension end of the plunger to ensure effective contact between the extension end of the plunger cylinder and the inner surface of the guard plate unit 1. A stop step surface 9 is formed at the end of the two guard plate units 1 away from the connecting plate 2. A limit step surface 10 is formed at the position of the second housing 703 and the hydraulic cylinder support seat 701 corresponding to the stop step surface 9. The stop step surface 9 and the limit step surface 10 can stop each other to limit the movement stroke of the push-back guard plate assembly to the side where the second side is located. A spring (elastic element 11) is provided between the stop step surface 9 and the limit step surface 10.The drive element is used to drive the plunger cylinder. The drive element includes a DC brushless motor, a reducer 6, a hydraulic pump 4, an oil tank, a filter 12, a throttle valve 13, and a safety valve 21. The DC brushless motor is connected to the hydraulic pump 4 via the reducer 6. The hydraulic pump 4 is connected to the plunger cylinder and the oil tank. A filter, throttle valve 13, and safety valve 21 are installed on the oil line connecting the hydraulic pump 4 and the plunger cylinder. The DC brushless motor, reducer 6, hydraulic pump 4, oil tank, filter 12, throttle valve 13, and safety valve 21 are arranged along the length of the housing 7 and are connected to each other via snap-fit ​​connections. When installing the push-pull actuator in this embodiment, before assembling the first housing 702 and the second housing 703, the various parts of the drive element can be connected together to form a whole by snap-fit, and then the whole can be connected to the motor bushing 18 by thread. Finally, the assembled drive element and the motor bushing 18 are placed into the second internal cavity. In this embodiment, the drive element is arranged along the length of the housing 7, which occupies less space in the drilling radial direction in practical applications. Moreover, the housing 7 is set as a multi-segment structure, and the drive elements are snapped together, which facilitates the installation and maintenance of the push-pull actuator. The adapter module includes a pin 15 and an electrical connector 14. The first seal includes a circular sealing structure 22 and a second sealing ring 24. The pin 15 is formed on the circular sealing structure 22. One end of the electrical connector 14 is electrically connected to a DC brushless motor, and the other end of the electrical connector 14 is electrically connected to the circular sealing structure 22 via a wire. The pin 15 on the circular sealing structure 22 is used for electrical connection with an external circuit. The outer surface of the circular sealing structure 22 abuts against the inner wall of the first housing 702. Two sealing ring mounting grooves for mounting the second sealing ring 24 are formed on the outer surface of the circular sealing structure 22, thereby isolating the external environment through the circular sealing structure 22 and the second sealing ring 24. To prevent mud and impurities from entering, the second seal 17 includes a motor bushing 18 and a first sealing ring 19. The motor bushing 18 is fitted onto the connection between the electrical connector 14 and the DC brushless motor. The outer surface of the motor bushing 18 is in contact with the surface of the inner cavity 8 of the housing. The outer surface of the motor bushing 18 forms two mounting ring grooves 20, in which the first sealing ring 19 is installed. The first sealing ring 19 in the two mounting ring grooves 20 is used to seal the gaps between the motor bushing 18 and the first housing 702 and between the motor bushing 18 and the second housing 703, respectively, thereby preventing mud and impurities from entering from the connection gap between the first housing 702 and the second housing 703.In this embodiment, the push-pull actuator is connected to an external circuit via a converter module. The control components in the external circuit control the speed of the brushless DC motor through the converter module, and form a pressure closed loop using PID control to control the hydraulic pump 4 to output the target pressure. The brushless DC motor has precise and convenient speed adjustment. However, when the brushless DC motor is directly connected to the hydraulic pump 4, the torque is insufficient at low speeds, resulting in unstable speed under load. This causes significant fluctuations in the pressure generated by the hydraulic pump 4, which in turn leads to the hydraulic push-pull output force not being able to effectively support the well wall. Therefore, a reducer 6 is installed between the brushless DC motor and the hydraulic pump 4 to reduce the speed and increase the torque. In this embodiment, the reducer 6 uses a 1:3 transmission ratio, which can still ensure the stable pressure output of the hydraulic pump 4 even when the brushless DC motor is operating at low speeds, thus improving the stability and reliability of the hydraulic pump 4 output. A filter 12, a throttle valve 13, and a safety valve 21 are installed in the oil circuit between the hydraulic pump 4 and the plunger cylinder. The filter 12 increases the cleanliness of the hydraulic oil in the system, reducing the failure rate of the hydraulic system. The filtered hydraulic oil is then throttled through the small orifice of the throttle valve 13, creating a pressure drop and forming a high-pressure oil circuit to provide power to the hydraulic cylinder. The safety valve 21 sets the system's safety threshold to prevent excessive pressure in the system and increases the safety of the push-to-actuate mechanism. After the high-pressure oil enters the plunger cylinder, it pushes the plunger out, causing the dust cap 25 to abut against the groove 23, thus pushing the wear plate unit 1 to move towards the side where the second side is located. The connecting plate 2 moves towards the side where the second side is located under the action of the wear plate unit 1. After the second side surface of the push-to-actuate assembly contacts the well wall, as the lateral force continues to increase, due to the hinge between the wear plate unit 1 and the connecting plate 2, the wear plate unit 1 can rotate slightly around the hinge axis, causing the connecting plate 2 to adjust adaptively. The position of the two hinge axes changes according to the flatness of the well wall, so that the second side surface of the push-to-actuate assembly... The shape is adapted to the well wall surface, and the connecting plate 2 in the middle acts as a transition, making the bend of the second side surface of the push-fit plate assembly smoother. This results in a larger contact area between the second side surface of the push-fit plate assembly and the well wall, allowing the push-fit actuator to provide greater lateral thrust. Furthermore, as the push-fit plate assembly moves along the well wall, the plate unit 1 and the connecting plate 2 can also adaptively rotate around the hinge axis, ensuring effective contact between the second side surface of the push-fit plate assembly and the well wall surface, continuously providing sufficient lateral thrust, suitable for irregular wellbores. When hydraulic control ends and the piston cylinder thrust decreases, the spring at the non-connecting end of the plate unit 1 will press the push-fit plate assembly back to its initial position. Under the condition that the thrust of the push-fit actuator remains constant, by setting two piston cylinders, the contact area between the actuator and the push-fit plate assembly is increased, resulting in lower power output from the motor 3 and hydraulic pump 4, lower pressure within the push-fit actuator, reduced accident rate, and extended fault-free service time of the hydraulic system of the push-fit actuator.Furthermore, in this embodiment, the ends of the two guard plate units 1 away from the connecting plate 2 form inclined sections 26. The outer surface of the inclined sections 26 gradually tilts from the end near the connecting plate 2 toward the opposite end toward the side near the actuator. As a result, when the push guard plate assembly moves along the well wall with low smoothness, the inclined sections 26 can reduce the impact on the push guard plate assembly, reduce the wear of the push guard plate assembly, and extend the service life of the push guard plate assembly.

[0064] Based on the push-and-pull actuator mentioned in the above technical solution of the present invention, the present invention further provides a drilling directional tool, which includes the push-and-pull actuator mentioned above in this application. Thus, the push-and-pull actuator of the drilling directional tool has strong versatility and can maintain a large contact area with the well wall in various working conditions, thereby providing a large lateral push-and-pull force and having good deviation control reliability. In some specific embodiments, the drilling steerable tool further includes a steerable tool housing, a control component, and a drill string information acquisition component. The control component and the drill string information acquisition component are electrically connected. The control component is disposed in the steerable tool housing, and the drill string information acquisition component is disposed on the outer surface of the steerable tool housing. Multiple push-assist mechanisms are evenly distributed around the axial direction of the steerable tool housing. The motors 3 of the multiple push-assist mechanisms are electrically connected to the control component through an adapter module. The control component can send control signals to the motors 3 of the push-assist mechanisms according to the drill string information acquired by the drill string information acquisition component, control the speed of the motors 3, thereby controlling the oil pressure output by the hydraulic pump 4, and perform closed-loop control of the output oil pressure through PID control to control the oil pressure output by the hydraulic pump 4 at the target value, thereby achieving precise control of the extension and retraction of the hydraulic cylinder 5 of the push-assist mechanism.

[0065] Based on the drilling steerable tool mentioned in the above-described technical solution of this invention, this invention further provides a drilling system that includes the drilling steerable tool described in this application. This drilling system allows the pushing actuator to maintain a large contact area with the wellbore, thereby providing greater lateral thrust and stronger deviation control capability. In some specific embodiments, this drilling steerable tool can be combined with a screw in a rotary steerable drilling system to solve the problems of poor support effect, poor deviation control capability, and short service life under high-speed and strong vibration conditions.

[0066] As can be seen from the above description, the advantages of the present invention are as follows: First, the push-and-hold plate assembly is composed of multiple sequentially arranged plate units, and two adjacent plate units are rotatably connected. This allows the second side surface of the push-and-hold plate assembly to be adaptively adjusted according to the shape of the wellbore, increasing the contact area between the push-and-hold plate assembly and the wellbore. This enables the push-and-hold actuator to provide a greater lateral pushing force, enhancing the support effect and deviation control capability. It is suitable for irregular wellbores and can significantly reduce the accident rate when applied in complex working conditions such as different lithologies and unconformity interfaces. Second, the adjacent plate units are rotatably connected by a connecting plate, making the transition point of the second side surface of the push-and-hold plate assembly smoother, further enhancing the push-and-hold plate assembly. The contact area with the well wall is increased; third, a DC brushless motor is used, which makes speed adjustment more precise and convenient. A reducer is set between the DC brushless motor and the hydraulic cylinder, which solves the problem of insufficient torque generated by the DC brushless motor at low speeds, resulting in unstable pressure output by the hydraulic cylinder; fourth, the overall sealing performance of the push-to-assist mechanism is improved by the first seal, the second seal, and the dust cap, which can prevent mud and impurities from entering the circuit part and the plunger cylinder of the push-to-assist mechanism, reducing maintenance pressure and extending the service life of the push-to-assist mechanism; fifth, the push-to-assist mechanism is set as an independent component and is equipped with an adapter module for electrical connection to the external circuit, which can flexibly adjust the number of push-to-assist mechanisms connected to the drilling directional tool to meet different actual needs.

[0067] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0068] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0069] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A pusher actuator, characterized in that The push guard assembly comprises a driving element, an executing element and a plurality of guard units (1) arranged in sequence, two adjacent guard units (1) are rotatably connected, each guard unit (1) is provided with the executing element on the first side, and the driving element is used to drive the executing element to move the guard unit (1) to the second side.

2. The pusher actuator according to claim 1, characterized in that The push guard assembly further comprises a connecting plate (2), and two adjacent guard units (1) are rotatably connected through the connecting plate (2).

3. The pusher actuator according to claim 2, characterized in that The driving element comprises a motor (3), a hydraulic pump (4) and an oil tank, the executing element comprises a hydraulic cylinder (5), the telescopic end of the hydraulic cylinder (5) is provided on the first side of the guard unit (1), the motor (3) is used to drive the hydraulic pump (4), the oil tank is connected with the hydraulic cylinder (5) through the hydraulic pump (4), and the motor (3) is used to drive the hydraulic pump (4) to control the oil supply / oil return of the hydraulic cylinder (5).

4. The pusher actuator according to claim 3, characterized in that The adapter module further comprises an electrical connector (14) and a pin (15), one end of the pin (15) is used to electrically connect an external circuit, and the other end is electrically connected with the motor (3) through the electrical connector (14).

5. The pusher actuator according to claim 4, characterized in that The housing (7) is provided with a housing inner cavity (8) and a hydraulic cylinder support seat (701), the driving element and the adapter module are arranged in the housing inner cavity (8), the fixed end of the hydraulic cylinder (5) is mounted on the hydraulic cylinder support seat (701), and the first side of the guard unit (1) abuts against the telescopic end of the hydraulic cylinder (5).

6. The pusher actuator according to claim 5, characterized in that The first sealing element (16) is sealingly arranged between the pin (15) and the wall surface of the housing inner cavity (8), and the second sealing element (17) is sealingly arranged between the motor (3) and the wall surface of the housing inner cavity (8).

7. The pusher actuator according to claim 6, characterized in that The housing (7) comprises a first housing (702), a second housing (703) and the hydraulic cylinder support seat (701) connected in sequence, the first housing (702), the second housing (703) and the hydraulic cylinder support seat (701) cooperatively form the housing inner cavity (8), the second sealing element (17) comprises a motor bushing (18) and a pair of first sealing rings (19), the motor bushing (18) is sleeved at the connection between the electrical connector (14) and the motor (3), the outer surface of the motor bushing (18) forms a pair of mounting ring grooves (20) for mounting the first sealing rings (19), so that the pair of first sealing rings (19) are respectively arranged on both sides of the connecting gap between the first housing (702) and the second housing (703) along the length direction of the housing (7).

8. The pusher actuator according to claim 5, wherein, The non-connecting end of the push-against-plate assembly of the plate monomer (1) is formed with a stop step surface (9), the corresponding position of the shell (7) and the stop step surface (9) is formed with a limiting step surface (10), the stop step surface (9) and the limiting step surface (10) can stop each other to limit the movement stroke of the plate monomer (1) moving to the side where the second side is located.

9. The pusher actuator according to claim 8, characterized in that Further comprising an elastic member (11) arranged between the stop step surface (9) and the limiting step surface (10) to provide elastic force to drive the plate monomer (1) to move to the side where the first side is located.

10. The pusher actuator according to claim 3, wherein The driving element further comprises a speed reducer (6), the motor (3) is a direct current brushless motor, and the direct current brushless motor is connected with the hydraulic pump (4) through the speed reducer (6).

11. The pusher actuator according to claim 3, wherein The hydraulic cylinder (5) is a plunger cylinder, and a filter (12) is arranged in the hydraulic oil path between the hydraulic pump (4) and the plunger cylinder.

12. The pusher actuator according to claim 2, wherein, The push-against-plate assembly comprises two plate monomers (1), and the end of the two plate monomers (1) away from the connecting plate (2) is formed with an inclined section (26), the outer surface of the inclined section (26) gradually inclines to the side close to the driving element from the end close to the connecting plate (2) to the opposite end.

13. A borehole steering tool characterized by, The push-against-plate assembly comprises two plate monomers (1), and the end of the two plate monomers (1) away from the connecting plate (2) is formed with an inclined section (26), the outer surface of the inclined section (26) gradually inclines to the side close to the driving element from the end close to the connecting plate (2) to the opposite end.

14. A drilling system characterized by, The push-against-plate assembly comprises two plate monomers (1), and the end of the two plate monomers (1) away from the connecting plate (2) is formed with an inclined section (26), the outer surface of the inclined section (26) gradually inclines to the side close to the driving element from the end close to the connecting plate (2) to the opposite end. The push-against-plate assembly comprises two plate monomers (1), and the end of the two plate monomers (1) away from the connecting plate (2) is formed with an inclined section (26), the outer surface of the inclined section (26) gradually inclines to the side close to the driving element from the end close to the connecting plate (2) to the opposite end.

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