A pipe string centering and straightening mechanism

Abstract

The present invention discloses a pipe column centering and straightening mechanism, comprising a support frame, a centering drive mechanism and a straightening assembly. The straightening assembly comprises a sleeve and a guide tube sheet. The support frame is provided to facilitate installation of the entire device at the intersection of the required butted oil pipes. The centering drive mechanism is used to drive the straightening assembly to translate relatively, and the assembly is held tightly on the upper end of the installed oil pipe for positioning. The upwardly enlarged funnel-shaped structure of the guide tube sheet is used to capture the oil pipe to be installed above. The inner sides of the two semicircular sleeves are the positions for centering the oil pipe to be installed. The centering and straightening operation of the oil pipe to be installed is completed by only driving the lower end of the oil pipe to be installed downward along the guide tube sheet into the inner sides of the two semicircular sleeves, thereby completing the centering and straightening operation of the oil pipe to be installed. The efficiency of butt jointing of the oil pipes is significantly improved, and the positioning accuracy of the butt joint installation of the oil pipes is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well oil pipe installation, and more specifically, to a pipe string centering and straightening mechanism. Background Art

[0002] Foreign pressure-operated equipment started in the 1920s. After nearly a hundred years of development, the operating process has matured and has been widely promoted and applied. However, the speed of research and development of automated products is slow. During the operation of pressure-operated equipment, operators are required to stand on a high-level operating platform for a long time. Because the operating platform surrounds the wellhead and there is a high pressure in the well, in the process of installing the docking tubing upward, by adding an automatic feeding clamp device and an automatic control system on the basis of conventional tubing clamps, automatic extension, lifting, and automatic buckling and unbuckling functions can be realized. However, in the current automatic installation process of tubing docking, when the tubing is transferred and clamped above the installation position, there is a problem that the tubing position has not been accurately aligned with the installed tubing. It is necessary to perform centering and straightening operations on the tubing to be installed, which takes a long time and the centering accuracy needs to be improved. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] Another object of the present invention is to provide a pipe string centering and straightening mechanism to solve the technical problem of low efficiency of the oil pipe centering and straightening operation in the prior art.

[0005] In order to achieve these purposes and other advantages according to the present invention, a pipe string centering and straightening mechanism is provided, comprising:

[0006] A support frame, comprising a pair of support rods arranged parallel to each other in a horizontal direction;

[0007] A centering drive mechanism is symmetrically arranged at the outer ends of the two support rods, and the driving directions of the two centering drive mechanisms are arranged oppositely and are located on the same horizontal line;

[0008] The straightening assembly includes a pair of semicircular sleeves arranged vertically and oppositely, the outer wall of each sleeve is connected to a centering drive mechanism, the central axis of the two sleeves and the driving direction of the centering drive mechanism are located in the same vertical plane, and a guide cylinder piece is arranged upward on the top of the sleeve. The guide cylinder piece is in the shape of a half funnel with a diameter gradually increasing upward, and the two guide cylinder pieces are arranged oppositely, and the inner diameter of the guide cylinder piece, the inner diameter of the sleeve, and the diameter of the coupling of the oil pipe are equal.

[0009] Preferably, the centering drive mechanism includes a fixed plate arranged vertically, a push cylinder is fixed on the fixed plate, the telescopic end of the push cylinder is fixedly connected to the outer side wall of the sleeve and the telescopic direction is perpendicular to the central axis of the sleeve, and a limiting hole is provided on the fixed plate directly above or below the push cylinder in a direction perpendicular to the central axis of the sleeve, a limiting rod is inserted into the limiting hole, the limiting rod is slidably connected to the inner wall of the limiting hole and is fixedly connected to the corresponding position of the sleeve toward one end of the sleeve, and the length of the limiting rod is greater than the maximum telescopic length of the push cylinder.

[0010] Preferably, the support frame includes a horizontally arranged middle rod, both ends of the middle rod are downwardly connected to vertical rods, the lower end of the vertical rod is fixedly connected to one end of the support rod on one side that is not connected to the push cylinder, and an angle plate is connected between the vertical rod and the support rod on the corresponding side.

[0011] Preferably, the fixing plate is symmetrically provided with the limiting holes on the upper and lower sides of the pushing cylinder, and a limiting rod is inserted into each of the limiting holes, and each of the limiting rods is fixedly connected to the sleeve.

[0012] Preferably, the inner side of the sleeve is arranged as a lower section, a middle section, and an upper section from bottom to top, the inner diameters of the middle section and the upper section are the same and larger than the inner diameter of the lower section, and a step surface is formed at the junction of the middle section and the lower section, and a lifting cylinder is connected upward to the step surface, and a plurality of lifting cylinders are arranged at equal intervals in the circumferential direction of the sleeve, and a semicircular limiting cylinder piece is extended downward from the bottom of the guide cylinder piece, and the outer wall of the limiting cylinder piece is slidably connected to the inner wall of the upper section of the sleeve, and the bottom of the limiting cylinder piece is connected to the telescopic end of the lifting cylinder, and the inner diameter of the limiting cylinder piece and the inner diameter of the lower section of the sleeve are consistent with the coupling diameter of the oil pipe.

[0013] Preferably, the lower section and the middle section of the sleeve are an integrated structure, the upper section and the middle section of the sleeve are a separate structure, the telescopic end of the push cylinder is connected to the outer side of the middle section of the sleeve, the lower limiting rod is connected to the outer side of the lower section of the sleeve, the upper limiting rod is connected to the upper outer end of the sleeve and the upper side of the fixed plate is connected to an auxiliary oil cylinder, the telescopic end of the auxiliary oil cylinder is horizontally arranged and connected to the upper limiting rod, a track is vertically arranged on the inner side of the upper section of the sleeve, and in the radial direction of the sleeve, the size of the end away from the axis is larger than the size of the end close to the axis, and the outer side of the limiting cylinder piece is radially connected to The slider is located in the track and is vertically slidably connected to the track. The cross-sectional shape of the slider is consistent with the cross-sectional shape of the track. The bottom of the limiting cylinder is provided with a groove corresponding to each of the lifting cylinders. The groove is truncated cone-shaped and the inner wall is provided with a magnet plate structure. An electromagnet is provided upward on the top of the telescopic end of the lifting cylinder. The electromagnet is truncated cone-shaped and is arranged in cooperation with the magnetic suction groove. After power is turned on, the electromagnet can be adsorbed and connected with the magnetic suction groove. The bottom of the upper section of each sleeve is radially connected to the axis with a baffle. The baffle extends below the bottom of the limiting cylinder and does not exceed the bottom of the groove. Pressure sensors are relatively arranged on the inner sides of the two limiting cylinders.

[0014] The present invention at least includes the following beneficial effects: the tubing centering and straightening mechanism of the present invention includes a support frame, a centering drive mechanism, and a straightening assembly, the straightening assembly includes a sleeve and a guide tube sheet, and the support frame is provided to facilitate the installation of the entire device at the intersection of the required docking oil pipes, and the centering drive mechanism is used to drive the straightening assembly to translate relatively, and hold the upper end of the installed oil pipe for positioning, and the upwardly expanded funnel-shaped structure of the guide tube sheet is used to capture the oil pipe to be installed above, and the inner side of the two semicircular sleeves is the position for centering the oil pipe to be installed, and the centering and straightening operation of the oil pipe to be installed is completed by only driving the lower end of the oil pipe to be installed downward along the guide tube sheet into the inner side of the two semicircular sleeves, thereby significantly improving the efficiency of oil pipe docking and the positioning accuracy of oil pipe docking installation.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a main structural diagram of the present invention;

[0017] Figure 2 It is a side structural diagram of the present invention;

[0018] Figure 3 It is a top view of the structure of the present invention;

[0019] Figure 4 It is a main structural diagram of an embodiment of the present invention;

[0020] Figure 5 A main structural diagram of another embodiment of the present invention;

[0021] Figure 6 The figure is a top view of the structure of a straightening assembly according to an embodiment of the present invention.

[0022] Figure numerals in the specification: 1. support frame, 2. support rod, 3. intermediate rod, 4. vertical rod, 5. angle plate, 6. centering drive mechanism, 7. fixed plate, 8. push cylinder, 9. sleeve, 10. guide cylinder, 11. limit rod, 12. upper section, 13. middle section, 14. lower section, 15. lift cylinder, 16. limit cylinder, 17. auxiliary cylinder, 18. groove, 19. electromagnet, 20. baffle. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0024] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0025] like Figure 1-6 As shown, the present invention provides a pipe string centering and straightening mechanism, comprising:

[0026] A support frame 1, comprising a pair of support rods 2 arranged parallel to each other in a horizontal direction;

[0027] A centering drive mechanism 6, which is symmetrically arranged at the outer ends of the two support rods 2, and the driving directions of the two centering drive mechanisms 6 are arranged oppositely and are located on the same horizontal line;

[0028] The straightening assembly includes a pair of semicircular sleeves 9 arranged vertically and oppositely, the outer wall of each sleeve 9 is connected to a centering drive mechanism 6, the central axis of the two sleeves 9 and the driving direction of the centering drive mechanism 6 are located in the same vertical plane, and a guide cylinder sheet 10 is arranged upward on the top of the sleeve 9. The guide cylinder sheet 10 is in the shape of a half funnel with a diameter gradually increasing upward. The two guide cylinder sheets 10 are arranged oppositely, and the inner diameter of the guide cylinder sheet 10, the inner diameter of the sleeve 9, and the diameter of the coupling of the oil pipe are equal.

[0029] The pipe column centering and straightening mechanism is installed on the construction platform through the support frame 1, and the support frame 1 can be connected with the moving mechanism on the construction platform so that the support frame 1 drives the entire device to move to the required position. The support rod 2 of the support frame 1 has a certain length, and the support rod 2 extends forward. The straightening assembly is located in the middle of a pair of support rods 2, and the support rod 2 provides a docking space for the front straightening assembly. For the convenience of docking, the entire device is located at the upper end of the installed oil pipe, and nearly half of the space in the vertical inner space of the sleeve is left empty for the oil pipe to be installed. A centering drive mechanism 6 is respectively connected between the straightening assembly and the support rod 2 on the corresponding side. The relative position of the straightening assembly is changed by the driving action of the centering drive mechanism 6, so that the two sleeves 9 are relatively close or far away, and the guide cylinder sheet 10 is arranged at the upper end of the sleeve 9; when the oil pipe needs to be docked, the two sleeves 9 are aligned in the horizontal direction with the axis of the top of the installed oil pipe on the lower side, and the two sleeves 9 are first driven by the centering drive mechanism 6 to move toward each other. , until they are combined into a circle. At this time, the two sleeves 9 hold the top of the installed oil pipe tightly, and there is still a limited space in the upper half of the sleeve 9. The clamped oil pipe to be installed is driven to rotate to a vertical state through other clamping mechanisms, and the lower end of the oil pipe to be installed is aligned with the space between the two sleeves 9, and then the oil pipe to be installed is moved downward. The oil pipe to be installed first touches the guide cylinder piece 10. Since the guide cylinder piece 10 is funnel-shaped, the oil pipe to be installed moves toward the center of the guide cylinder piece 10 under the action of the inclined surface on the inner side of the guide cylinder piece 10 until it is completely aligned with the central axis of the guide cylinder piece 10, and then the oil pipe to be installed continues to move downward until the lower end of the oil pipe to be installed enters the inner side of the sleeve 9 along the vertical direction limited by the sleeve 9, conflicts with the installed oil pipe, and the axis coincides, that is, the centering and straightening operation of one oil pipe is completed, and then the sleeve 9 is driven to move outward by the centering drive mechanism 6, away from the installed oil pipe, and moved to the next position to repeat the operation to install a new oil pipe.

[0030] In another technical solution, Figure 1-2As shown, the centering drive mechanism 6 includes a fixed plate 7 arranged vertically, and a push cylinder 8 is fixed on the fixed plate 7. The telescopic end of the push cylinder 8 is fixedly connected to the outer wall of the sleeve 9 and the telescopic direction is perpendicular to the central axis of the sleeve 9. A limiting hole is opened on the fixed plate 7 just above or below the push cylinder 8 in a direction perpendicular to the central axis of the sleeve 9. A limiting rod 11 is inserted into the limiting hole. The limiting rod 11 is slidably connected to the inner wall of the limiting hole and is fixedly connected to the corresponding position of the sleeve 9 at one end facing the sleeve 9. The length of the limiting rod 11 is greater than the maximum telescopic length of the push cylinder 8.

[0031] When the sleeve 9 is moved through the centering drive mechanism 6, the push cylinder 8 provides power. In addition, by setting the limit hole and the limit rod 11 to cooperate with each other, during the movement of the telescopic end of the push cylinder 8, the moving path of the sleeve 9 is limited to ensure the linear accuracy of the front and rear directions and positions of the sleeve 9.

[0032] In another technical solution, Figure 1-2 As shown, the support frame 1 includes a horizontally arranged middle rod 3, and the two ends of the middle rod 3 are connected downwardly with vertical rods 4, and the lower end of the vertical rod 4 is fixedly connected to the end of the support rod 2 on one side that is not connected to the push cylinder 8, and an angle plate 5 is connected between the vertical rod 4 and the support rod 2 on the corresponding side. The middle rod 3 is arranged to facilitate connection with external walking equipment, the vertical rod 4 expands the vertical space range where the support rod 2 is located, and the angle plate 5 is arranged to play a role in reinforcing the connection.

[0033] In another technical solution, Figure 1-2 As shown, the fixing plate 7 is provided with the limiting holes symmetrically on the upper and lower sides of the jacking oil cylinder 8, and a limiting rod 11 is respectively inserted into each of the limiting holes, and each of the limiting rods 11 is respectively fixedly connected to the sleeve 9. By symmetrically arranging the limiting rods 11 on the upper and lower sides of the jacking oil cylinder, the upper and lower sides of the sleeve 9 are kept balanced when the jacking oil cylinder moves laterally, thereby avoiding vertical angle deviation or torque.

[0034] In another technical solution, Figure 1-2As shown, the inner side of the sleeve 9 is arranged as a lower section 14, a middle section 13, and an upper section 12 from bottom to top, the inner diameters of the middle section 13 and the upper section 12 are the same and larger than the inner diameter of the lower section 14, and a step surface is formed at the junction of the middle section 13 and the lower section 14, and a lifting cylinder 15 is connected upward to the step surface. A plurality of lifting cylinders 15 are arranged at equal intervals in the circumferential direction of the sleeve 9, and a semicircular limiting cylinder piece 16 is extended downward from the bottom of the guide cylinder piece 10, and the outer side wall of the limiting cylinder piece 16 is slidably connected to the inner side wall of the upper section 12 of the sleeve 9, and the bottom of the limiting cylinder piece 16 is connected to the telescopic end of the lifting cylinder 15, and the inner diameter of the limiting cylinder piece 16 and the inner diameter of the lower section 14 of the sleeve 9 are consistent with the coupling diameter of the oil pipe.

[0035] The two semicircular limiting cylinder pieces 16 are spliced ​​in the horizontal direction to form a hollow cylindrical structure. The size of the lifting oil cylinder in the middle section can be such that the inner space is larger than the diameter of the oil pipe. The two guide cylinder pieces 10 above the limiting cylinder piece 16 play a role in guiding the position of the oil pipe to be installed that is about to enter the inner side of the sleeve 9. By setting the lifting oil cylinder 15, the lifting oil cylinder 15 is extended upward to drive the limiting cylinder piece 16 to move upward, and the limiting cylinder piece 16 slides upward relative to the inner wall of the sleeve 9, synchronously driving the guiding cylinder piece 10 to move upward, so that the lower end position of the oil pipe to be installed can contact the upper oil pipe in advance for position guidance, and the guiding range of the limiting cylinder piece 16 for the oil pipe to be installed is appropriately increased. After guidance, the lifting oil cylinder 15 is retracted, and the limiting cylinder piece 16 descends, so that the inner oil pipe moves vertically, and the accuracy of the oil pipe movement angle is guaranteed within a certain distance range, the guiding docking efficiency of the oil pipe is improved, and a straightening effect is played.

[0036] In another technical solution, Figure 4-5As shown, the lower section 14 and the middle section 13 of the sleeve 9 are an integrated structure, and the upper section 12 and the middle section 13 of the sleeve 9 are a separate structure. The telescopic end of the push cylinder 8 is connected to the outside of the middle section 13 of the sleeve 9, the lower limiting rod 11 is connected to the outside of the lower section 14 of the sleeve 9, the upper limiting rod 11 is connected to the upper outer end of the sleeve 9, and the upper side of the fixing plate 7 is connected to an auxiliary cylinder 17, the telescopic end of the auxiliary cylinder 17 is horizontally arranged and connected to the limiting rod 11 on the upper side, a track is vertically arranged on the inner side of the upper section 12 of the sleeve 9, and the track is radially arranged in the sleeve 9. The size of the end away from the axis is larger than the size of the end close to the axis, and the outer side of the limiting cylinder piece 16 is radially connected to the outer side of the sleeve 9. A slider is connected, the slider is located in the track and is vertically slidably connected to the track, the cross-sectional shape of the slider is consistent with the cross-sectional shape of the track, the bottom of the limiting cylinder 16 corresponds to each of the lifting cylinders 15 and is provided with a groove 18 upward, the groove 18 is truncated cone-shaped and the inner wall is provided with a magnet plate structure, an electromagnet 19 is provided upwardly on the top of the telescopic end of the lifting cylinder 15, the electromagnet 19 is truncated cone-shaped and is provided in cooperation with the magnetic suction groove, after power is turned on, the electromagnet 19 can be adsorbed and connected with the magnetic suction groove, the bottom of the upper section 12 of each sleeve 9 is radially connected to the axis with a baffle 20, the baffle 20 extends below the bottom of the limiting cylinder 16 and does not exceed the bottom of the groove 18, and pressure sensors are relatively provided on the inner sides of the two limiting cylinders 16.

[0037] In the process of the centering and straightening mechanism guiding, centering and adjusting the relative position of the oil pipe above, since the oil pipe is long, the sleeve 9 needs a certain length, and the sleeve 9 is divided into two relatively independent parts. The middle section 13 and the lower section 14 of the sleeve 9 mainly correspond to the upper end of the installed oil pipe, and the lower section 14 of the sleeve 9 completely hugs the upper end of the installed oil pipe. The lower limit rod 11 on the outside and the pushing cylinder 8 mainly push the positions of the connected middle section 13 and the lower section 14 of the sleeve 9, and the upper section 12 of the sleeve 9 is used as the main guiding, centering and straightening structure for the oil pipe to be installed, wherein the two upper sections 12 of the sleeve 9 correspond to the two connected auxiliary The auxiliary oil cylinder 17 can guide the upper section 12 of the sleeve 9 to move only in the same horizontal direction under the directional limiting action between the upper limit rod 11 and the fixing plate 7, so as to adapt to the certain position and angle deviation of the oil pipe to be installed in the vertical direction. By driving the auxiliary oil cylinder 17 to extend and retract horizontally, the radial position of the upper section 12 of the sleeve 9 can be slightly adjusted, thereby driving the oil pipe located on the inner side to be adjusted, reducing the influence of low efficiency of oil pipe docking caused by directly limiting the horizontal plane to only have the oil pipe cross-sectional area as the docking range. During the adjustment process, the pressure sensors on the inner sides of the two limit cylinder pieces 16 are used to obtain The pressure data is used to help evaluate whether the inner push oil pipe is in place. Since the upper section 12 of the sleeve 9 and the limiting cylinder piece 16 are slidably connected by a track and a slider, the limiting cylinder piece 16 only vertically displaces relative to the upper section 12 of the sleeve 9, and the baffle 20 arranged at the bottom of the upper section 12 of the sleeve 9 blocks the bottom of the limiting cylinder piece 16 to prevent the bottom of the limiting cylinder piece 16 from passing below the upper section 12 of the sleeve 9. When the limiting cylinder piece 16 moves outward to a small position, the lifting cylinder 15 can still lift the limiting cylinder piece 16 upward to cooperate with the auxiliary cylinder 17 to expand the capture range of the oil pipe. When the upper section 12 of the sleeve 9 and the limiting cylinder piece 16 capture After the lower end of the oil pipe to be installed is adjusted horizontally into place, at this time, the groove 18 of the limit cylinder 16 is restored to align with the top of the telescopic end of the jacking cylinder 15 below, and then the telescopic end of the jacking cylinder 15 is driven upward to enter the groove 18, and the electromagnet 19 is energized to make the electromagnet 19 magnetic and adsorbed inside the groove 18, thereby temporarily fixing the upper section 12 of the sleeve 9 as a whole, completing the docking operation of the oil pipe at this stage. When the centering and straightening mechanism needs to be released afterwards, the auxiliary cylinder 17 and the pushing cylinder 8 are synchronously driven to retract, and the entire pipe column centering and straightening mechanism is moved to the next position to be docked for installation and operation.

[0038] To summarize, the tubing centering and straightening mechanism of the present invention comprises a support frame, a centering drive mechanism, and a straightening assembly. The straightening assembly comprises a sleeve and a guide tube sheet. The support frame is provided to facilitate installation of the entire device at the junction of the required docking oil pipes. The centering drive mechanism is used to drive the straightening assembly to translate relatively. The lower end of the straightening assembly is tightly clamped on the upper end of the installed oil pipe for positioning. The upwardly enlarged funnel-shaped structure of the guide tube sheet is used to capture the oil pipe to be installed above. The inner side of the two semicircular sleeves is the space for centering the oil pipe to be installed. It only needs to drive the lower end of the oil pipe to be installed downward along the guide tube sheet into the inner side of the two semicircular sleeves to complete the centering and straightening operation of the oil pipe to be installed, which significantly improves the efficiency of oil pipe docking and improves the positioning accuracy of oil pipe docking installation.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A pipe string centering and straightening mechanism, characterized in that: include: A support frame, comprising a pair of support rods arranged parallel to each other in a horizontal direction; A centering drive mechanism is symmetrically arranged at the outer ends of the two support rods, and the driving directions of the two centering drive mechanisms are arranged oppositely and are located on the same horizontal line; A straightening assembly, comprising a pair of semicircular sleeves arranged vertically and oppositely, the outer side wall of each sleeve being connected to a centering drive mechanism, the central axes of the two sleeves and the driving direction of the centering drive mechanism being located in the same vertical plane, a guide cylinder piece being arranged upward on the top of the sleeve, the guide cylinder piece being in the shape of a half funnel with a diameter gradually increasing upward, the two guide cylinder pieces being arranged oppositely, and the inner diameter of the guide cylinder piece, the inner diameter of the sleeve, and the diameter of the coupling of the oil pipe being equal; The inner side of the sleeve is sequentially arranged as a lower section, a middle section, and an upper section from bottom to top. The inner diameters of the middle section and the upper section are the same and larger than the inner diameter of the lower section, and a step surface is formed at the junction of the middle section and the lower section. A lifting cylinder is connected upward to the step surface. A plurality of lifting cylinders are arranged at equal intervals in the circumferential direction of the sleeve. A semicircular limiting cylinder piece is extended downward from the bottom of the guide cylinder piece. The outer side wall of the limiting cylinder piece is slidably connected to the inner side wall of the upper section of the sleeve. The bottom of the limiting cylinder piece is connected to the telescopic end of the lifting cylinder. The inner diameter of the limiting cylinder piece and the inner diameter of the lower section of the sleeve are consistent with the coupling diameter of the oil pipe. The centering drive mechanism comprises a fixing plate arranged vertically, a push oil cylinder is fixed on the fixing plate, a telescopic end of the push oil cylinder is fixedly connected to the outer side wall of the sleeve and the telescopic direction is perpendicular to the central axis of the sleeve, a limiting hole is provided on the fixing plate just above or just below the push oil cylinder in a direction perpendicular to the central axis of the sleeve, a limiting rod is inserted into the limiting hole, the limiting rod is slidably connected to the inner wall of the limiting hole and is fixedly connected to the corresponding position of the sleeve at one end facing the sleeve, and the length of the limiting rod is greater than the maximum telescopic length of the push oil cylinder; The lower section and the middle section of the sleeve are an integrated structure, and the upper section and the middle section of the sleeve are a separate structure. The telescopic end of the push cylinder is connected to the outer side of the middle section of the sleeve, the lower limiting rod is connected to the outer side of the lower section of the sleeve, the upper limiting rod is connected to the upper outer end of the sleeve and the upper side of the fixed plate is connected to an auxiliary oil cylinder, the telescopic end of the auxiliary oil cylinder is horizontally arranged and connected to the upper limiting rod, a track is vertically arranged on the inner side of the upper section of the sleeve, and the size of the track at the end away from the axis in the radial direction of the sleeve is larger than the size of the end close to the axis, and a slider is radially connected to the outer side of the limiting cylinder sheet. The slider is located in the track and is vertically slidably connected to the track. The cross-sectional shape of the slider is consistent with the cross-sectional shape of the track. The bottom of the limiting cylinder is provided with a groove corresponding to each of the lifting cylinders. The groove is truncated cone-shaped and the inner wall is provided with a magnet plate structure. An electromagnet is provided upward on the top of the telescopic end of the lifting cylinder. The electromagnet is truncated cone-shaped and is matched with the magnetic suction groove. After power is turned on, the electromagnet can be adsorbed and connected with the magnetic suction groove. The bottom of the upper section of each sleeve is radially connected to the axis with a baffle. The baffle extends below the bottom of the limiting cylinder and does not exceed the bottom of the groove. Pressure sensors are relatively provided on the inner sides of the two limiting cylinders.

2. The pipe string centering and straightening mechanism according to claim 1, characterized in that: The support frame includes a horizontally arranged middle rod, both ends of which are downwardly connected to vertical rods, the lower end of the vertical rod is fixedly connected to one end of the support rod on one side that is not connected to the push cylinder, and an angle plate is connected between the vertical rod and the support rod on the corresponding side.

3. The pipe string centering and straightening mechanism according to claim 1, characterized in that: The fixing plate is symmetrically provided with the limiting holes on the upper and lower sides of the push oil cylinder, and a limiting rod is inserted into each of the limiting holes, and each of the limiting rods is fixedly connected to the sleeve.

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