Drill collar straightening device and method

Abstract

The present invention discloses a drill collar straightening device and method, and relates to the technical field of drill collar processing. The drill collar straightening device comprises a workbench, a straightening module and a supporting device, the supporting device is installed on the top of the workbench, and the supporting device is used to support the drill collar to be straightened; the straightening module comprises a moving seat, a power device, a straightening device and a walking device, and the straightening device comprises a fixing mechanism, a straightening hydraulic cylinder and a pressure head; the power device is used to drive the movable end of the straightening hydraulic cylinder to make reciprocating motion in the vertical direction, driving the pressure head to apply pressure to the curved part of the drill collar to be straightened or to loosen the drill collar to be straightened; the power device comprises a combined pump, and the combined pump is used to provide pressurized liquid oil to the straightening hydraulic cylinder. The drill collar straightening device of the present invention has the advantages of small size and high straightening efficiency, and can reduce the wear on the drill collar surface caused by the straightening process.

Description

Technical Field

[0001] The invention relates to the technical field of drill collar processing, and in particular to a drill collar straightening device and a drill collar straightening method. Background Art

[0002] Drill collar is an important downhole tool in oil and gas drilling projects, usually connected to the drill bit. Drill collars are generally cylindrical tubes with thick walls. The length of a single drill collar is several meters to ten meters. Drill collars have great gravity and rigidity, which can exert drilling pressure on the drill bit, ensure the necessary strength under compression conditions, reduce the vibration, swing and jump of the drill bit, make the drill bit work smoothly, and control the well inclination.

[0003] During the preparation of drill collars, after the drill collars are heat treated to strengthen their strength, they are bent at some locations due to problems such as thermal deformation. However, the use of drill collars requires them to have a certain degree of straightness, so the drill collars need to be straightened after heat treatment. The commonly used straightening method is the mechanical pressure straightening method, which uses a pressure device to apply an external force in the opposite direction of the bending direction to the bent part of the drill collar, causing the drill collar to deform in the opposite direction, thereby achieving the purpose of straightening.

[0004] In traditional drill collar straightening equipment, hydraulic cylinders are often used as pressure devices to apply pressure to the bent parts of the drill collars. Since the drill collars have a large gravity and rigidity, in order to enable the drill collars to undergo reverse deformation to achieve the purpose of straightening, this requires the hydraulic cylinders to have a very large straightening force. Therefore, large hydraulic cylinders are usually required in drill collar straightening. Large hydraulic cylinders are large in size and heavy in weight, which makes the entire drill collar straightening equipment extremely heavy and occupies a large area, resulting in high equipment infrastructure costs and great installation difficulty. Moreover, due to the heavy weight and large size of the hydraulic cylinder used in the drill collar straightening equipment, the traditional drill collar straightening equipment usually adopts the method of fixing the hydraulic cylinder in a fixed position and moving the drill collar to straighten the curved parts at different positions on the drill collar. The frequent movement of the drill collar will increase the friction between the drill collar and the contact parts such as the support device and the conveying device, accelerate the wear of the drill collar surface, and thus reduce the service life of the drill collar. In addition, due to the long length of the drill collar, the method of fixing the hydraulic cylinder in a fixed position and moving the drill collar for straightening requires more space for the movement of the drill collar, further increasing the floor space occupied by the straightening station.

[0005] In addition, since the drill collar is at the front end of the deep-sea drilling pipeline, it may heat up due to friction during the drilling process. At the same time, there is a high temperature environment underground. When in a high temperature environment, the part of the drill collar that is compressed during straightening will produce stress release, causing the drill collar to bend, affecting the normal work of the drill collar. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a drill collar straightening device and method, which can automatically straighten the drill collar to be straightened efficiently and accurately.

[0007] Another object of the present invention is to provide a drill collar straightening device and method, which can reduce the wear on the drill collar surface.

[0008] In order to solve the above technical problems, the present invention provides a drill collar straightening device, comprising a workbench, a straightening module and a supporting device, wherein the supporting device is installed on the top of the workbench, and the supporting device is used to support the drill collar to be straightened;

[0009] The straightening module comprises a moving seat, a power device, a straightening device and a walking device, and the straightening device comprises a fixing mechanism, a straightening hydraulic cylinder and a pressure head; the moving seat is slidably mounted on the bottom end of the workbench, the power device and the fixing mechanism are respectively mounted on the moving seat, the straightening hydraulic cylinder is mounted on the fixing mechanism, and the straightening hydraulic cylinder is located above the workbench, and the movable end of the straightening hydraulic cylinder is connected to the pressure head; the power device is used to drive the movable end of the straightening hydraulic cylinder to reciprocate in the vertical direction, driving the pressure head to apply pressure to the bending part of the drill collar to be straightened or to loosen the drill collar to be straightened;

[0010] The power device comprises a combination pump, which is used to provide pressurized hydraulic oil to the straightening hydraulic cylinder, and the maximum working pressure of the combination pump is 50MPa~63MPa;

[0011] The walking device is fixedly mounted on the moving seat, and the walking device is slidably connected to the workbench, and the walking device is used to drive the moving seat to reciprocate along the length direction of the workbench;

[0012] The pressure head includes a pressure head body, a main pressure plate and auxiliary pressure plates located on both sides of the main pressure plate, the top of the main pressure plate is provided with a first self-locking inclined surface, one side of the first self-locking inclined surface is provided with a lifting and lowering adjustment block that can move horizontally, and the lifting and lowering adjustment block is provided with a second self-locking inclined surface that cooperates with the first self-locking inclined surface; the auxiliary pressure plate is arranged parallel to the main pressure plate, the auxiliary pressure plate is connected to the pressure head body through a swing shaft, the top of the auxiliary pressure plate is provided with an adjusting nut, and the adjusting nut is connected to the adjusting motor located on one side of the auxiliary pressure plate through an adjusting screw.

[0013] As an improvement of the above scheme, the pressure head also includes a rack, a lifting and lowering adjustment gear and a lifting and lowering adjustment motor; the lifting and lowering adjustment block is connected to the rack, the rack is meshed with the lifting and lowering adjustment gear, and the lifting and lowering adjustment gear is connected to the lifting and lowering adjustment motor; the upper and lower parts of the lifting and lowering adjustment block are provided with limiting sliding surfaces, and a horizontally arranged slide groove is provided in the pressure head body, and the lifting and lowering adjustment block can slide in the slide groove through the limiting sliding surface.

[0014] As an improvement of the above solution, the two sides of the main pressure plate extend outward to form a supporting portion, and a pre-stress spring is provided between the bottom surface of the supporting portion and the pressure head body, and the pre-stress spring is used to press the main pressure plate against the lifting and adjusting block.

[0015] As an improvement of the above solution, the walking device includes a walking drive mechanism and a transmission mechanism, and the transmission mechanism includes a support seat, a transmission assembly and a positioning assembly;

[0016] The workbench is provided with a guide rail, and the guide rail is installed on the workbench along the length direction of the workbench;

[0017] The support seat is fixedly mounted on the moving seat, the transmission assembly is mounted inside the support seat, the travel drive mechanism is in transmission connection with one end of the transmission assembly, the other end of the transmission assembly is in sliding connection with the guide rail, and the travel drive mechanism is used to drive the transmission assembly to perform rotational motion along the axial direction;

[0018] The positioning assembly is installed on the top of the support seat, and the positioning assembly abuts against the side wall of the workbench;

[0019] The transmission assembly includes a transmission shaft and a transmission wheel, wherein the transmission shaft is installed inside the support seat, one end of the transmission shaft passes through the support seat and is transmission-connected to the travel drive mechanism, the other end of the transmission shaft is fixedly connected to the transmission wheel, and the transmission wheel is slidably connected to the guide rail;

[0020] The positioning assembly comprises a positioning seat and a positioning wheel. The positioning seat is mounted on the top of the supporting seat. The positioning wheel is rotatably mounted on the positioning seat. The wheel surface of the positioning wheel abuts against the side wall of the workbench.

[0021] As an improvement of the above scheme, the transmission mechanism is provided with four, and the four transmission mechanisms are symmetrically arranged on both sides of the workbench in pairs, and the four transmission mechanisms are respectively installed at the four corners of the moving seat; a transmission component of one of the transmission mechanisms is in transmission connection with the walking drive mechanism;

[0022] The workbench comprises an integrally formed mounting top plate, a connecting body and a mounting bottom plate, wherein the mounting top plate and the mounting bottom plate are respectively arranged at the top and the bottom of the connecting body, and both sides of the mounting top plate and the mounting bottom plate protrude from both sides of the connecting body;

[0023] The guide rail is installed on the top surface of the installation bottom plate, and the wheel surface of the positioning wheel is in contact with the side wall of the installation top plate.

[0024] As an improvement of the above solution, the drill collar straightening device further comprises a rotating device, and the rotating device is used to drive the drill collar to be straightened to perform circular motion along the axial direction;

[0025] The rotating device comprises a rotating mounting seat, a first rotating wheel, a second rotating wheel and a rotating driving mechanism, wherein the rotating mounting seat is mounted on the top of the workbench, and the first rotating wheel, the second rotating wheel and the rotating driving mechanism are all mounted on the rotating mounting seat;

[0026] The first rotating wheel and the second rotating wheel are synchronously connected in transmission, the rotation drive mechanism is connected in transmission to the first rotating wheel, and the rotation drive mechanism is used to drive the first rotating wheel to rotate.

[0027] As an improvement of the above solution, the combined pump includes a first hydraulic pump and a second hydraulic pump, and the oil outlet ends of the first hydraulic pump and the second hydraulic pump are respectively connected to the inner cavity of the straightening hydraulic cylinder;

[0028] The maximum working pressure of the first hydraulic pump is greater than the maximum working pressure of the second hydraulic pump, and the maximum working flow of the first hydraulic pump is less than the maximum working flow of the second hydraulic pump; the maximum working pressure of the first hydraulic pump is 50MPa~63MPa, and the maximum working pressure of the second hydraulic pump is 10MPa~15MPa.

[0029] As an improvement of the above solution, the power device further includes an oil tank, a hydraulic drive mechanism, a first reversing valve and a second reversing valve, the combined pump is installed inside the oil tank, the hydraulic drive mechanism is installed outside the oil tank, the hydraulic drive mechanism is transmission-connected to the first hydraulic pump, and the first hydraulic pump is transmission-connected to the second hydraulic pump;

[0030] The oil inlets of the first hydraulic pump and the second hydraulic pump are both connected to the oil tank, the oil outlet of the first hydraulic pump is connected to the first oil inlet of the first reversing valve, the oil outlet of the second hydraulic pump is connected to the second oil inlet of the first reversing valve, and the oil outlet of the first reversing valve is connected to the oil inlet of the second reversing valve;

[0031] The straightening hydraulic cylinder is provided with a rod chamber and a rodless chamber inside, the first oil outlet end of the second reversing valve is connected to the rod chamber, the second oil outlet end of the second reversing valve is connected to the rodless chamber, and the oil return end of the second reversing valve is connected to the oil tank.

[0032] Accordingly, the present invention also provides a drill collar straightening method, using the above-mentioned drill collar straightening device, comprising the following steps:

[0033] (1) Place the drill collar to be straightened on the support device;

[0034] (2) measuring the curvature of the drill collar to be straightened, determining and recording a number of curvatures of the drill collar to be straightened and the curvature value corresponding to each curvature;

[0035] (3) moving the straightening module to the bending portion and applying pressure for the first time, so that the bending portion undergoes the first deformation;

[0036] (4) separating the straightening module from the bending portion;

[0037] (5) moving the straightening module to the bent portion and applying pressure for a second time, so that the bent portion undergoes a second deformation;

[0038] (6) When the straightness of the bent portion reaches the expected straightening requirement, stop applying pressure and continue to keep the straightening module in contact with the bent portion for a preset time;

[0039] (7) Separating the straightening module from the bending portion.

[0040] As an improvement of the above solution, the original deformation of the maximum deformation point in the bending part before pressure is applied is S1, and the deformation of the bending part after the first pressure is applied is S2, S2=(0.3~0.6)S1.

[0041] As an improvement of the above solution, the step of moving the straightening module to the bending part and applying pressure for the first time to cause the bending part to deform for the first time includes:

[0042] Move the straightening module to the curved part and align the main pressure plate with the maximum deformation point of the curved part; adjust the installation height of the main pressure plate according to the bending value of the curved part, so that the working surfaces of the main pressure plate and the auxiliary pressure plates on both sides fit the curved surface of the drill collar to be straightened;

[0043] Driven by the power device, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply the first pressure to the bending part, and drive the auxiliary pressure plate to swing to a predetermined angle, so that the bending part undergoes the first deformation.

[0044] As an improvement of the above solution, the step of moving the straightening module to the curved portion and applying pressure for a second time to cause the curved portion to deform for a second time includes:

[0045] Move the straightening module to the curved part and align the main pressure plate with the maximum deformation point of the curved part; adjust the installation height of the main pressure plate according to the bending value of the curved part, so that the working surfaces of the main pressure plate and the auxiliary pressure plates on both sides fit the curved surface of the drill collar to be straightened;

[0046] Driven by the power device, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply pressure to the bending part for the second time, and drive the auxiliary pressure plate to swing to a predetermined angle or keep the auxiliary pressure plate stationary, so that the bending part undergoes a second deformation.

[0047] The implementation of the present invention has the following beneficial effects:

[0048] 1. The drill collar straightening device of the present invention can greatly reduce the volume of the straightening hydraulic cylinder by adopting a combined pump to provide pressurized liquid oil in the straightening hydraulic cylinder, thereby effectively reducing the volume of the entire straightening device and the drill collar straightening device, which can not only save the space occupied by the drill collar straightening device and reduce the high cost of equipment infrastructure construction and the difficulty of installation, but also, due to the reduction in the volume of the straightening device, it is conducive to using a mobile straightening device to straighten the curved parts at different positions on the drill collar, avoid frequent movement of the drill collar, effectively reduce the wear on the drill collar surface, thereby helping to extend the service life of the drill collar, and can further reduce the use space of the equipment.

[0049] Secondly, the pressure head of the present invention includes a pressure head body, a main pressure plate and auxiliary pressure plates located on both sides of the main pressure plate. The main pressure plate can adjust its relative position with the auxiliary pressure plate so that the main pressure plate and the auxiliary pressure plate can fit the surface of the drill collar to be straightened, thereby reducing the pressure on the drill collar surface during the straightening process and avoiding damage to the drill collar surface; the auxiliary pressure plate can swing to a predetermined angle during the straightening process and cooperate with the main pressure plate to reduce the stress concentration phenomenon near the straightening point and avoid the accumulation of large internal stress in the drill collar after straightening.

[0050] Thirdly, the drill collar straightening equipment adopts a frame movable structure, that is, the straightening module can reciprocate along the length direction of the workbench, and can perform compression straightening on drill collars at different positions, effectively improving the straightening efficiency and accuracy. In addition, by using a combined pump to provide pressurized liquid oil to the straightening hydraulic cylinder, the straightening efficiency can be further improved.

[0051] 2. The drill collar straightening method of the present invention adopts a straightening method of multi-stage pressure application and pressure point control, which can improve the straightening accuracy and reduce the stress accumulation of the workpiece after straightening, avoiding the stress release of the workpiece in a high-temperature working environment, causing the drill collar to bend again.

[0052] Moreover, the original deformation of the maximum deformation point in the bending part of the present invention before pressure is applied is S1, and the deformation of the bending part after the first pressure is S2, S2 = (0.3~0.6) S1. And by controlling the two pressure processes, specifically controlling the pressure of the main pressure plate and the auxiliary pressure plate in the first deformation, and the swing angle of the auxiliary pressure plate, controlling the pressure of the main pressure plate and the auxiliary pressure plate in the second deformation, and whether the auxiliary pressure plate swings, automatic straightening is achieved and the accuracy of straightening is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a structural schematic diagram of a drill collar straightening device in one embodiment of the present invention;

[0054] Figure 2 yes Figure 1 A schematic structural diagram of the drill collar straightening device of the illustrated embodiment at another angle;

[0055] Figure 3 is a schematic diagram of the pressure head structure of an embodiment of the present invention;

[0056] Figure 4 is a schematic diagram of the internal structure of a pressure head according to an embodiment of the present invention;

[0057] Figure 5 is a schematic diagram of the internal structure of a pressure head according to an embodiment of the present invention from another perspective;

[0058] Figure 6 This is a schematic diagram of the action principle of the pressure head straightening process according to one embodiment of the present invention;

[0059] Figure 7 yes Figure 2 The enlarged schematic diagram of S in the middle;

[0060] Figure 8 yes Figure 1 A cross-sectional view of a transmission mechanism in a drill collar straightening device according to the illustrated embodiment;

[0061] Fig. 9 yes Figure 1 A schematic structural diagram of a straightening module in a drill collar straightening device according to the illustrated embodiment;

[0062] Fig.10 yes Figure 1 A schematic diagram of the structure of a power device in a drill collar straightening device of the illustrated embodiment;

[0063] Fig.11 yes Figure 1 A schematic diagram of the oil circuit connection of the straightening module in the drill collar straightening device of the illustrated embodiment;

[0064] Fig.12 is a structural schematic diagram of a drill collar straightening device in another embodiment of the present invention;

[0065] Fig.13 yes Fig.12 A schematic diagram of the structure of a rotating device in a drill collar straightening device of the illustrated embodiment;

[0066] Fig.14 yes Fig.13 A schematic diagram of the structure of the rotating device shown at another angle. DETAILED DESCRIPTION

[0067] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0068] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top” and “bottom” are 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. They 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.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] like Figures 1 to 11 As shown, this embodiment discloses a drill collar straightening device, comprising a workbench 1, a straightening module 2 and a supporting device 3, wherein the supporting device 3 is installed on the top of the workbench 1, and the supporting device 3 is used to support the drill collar 5 to be straightened;

[0071] The straightening module 2 includes a moving seat 21, a power device 22, a straightening device 23 and a walking device 24, the straightening device 23 includes a fixing mechanism 231, a straightening hydraulic cylinder 232 and a pressure head 233; the moving seat 21 is slidably installed at the bottom end of the workbench 1, the power device 22 and the fixing mechanism 231 are respectively installed on the moving seat 21, the straightening hydraulic cylinder 232 is installed on the fixing mechanism 231, and the straightening hydraulic cylinder 232 is located above the workbench 1, and the movable end of the straightening hydraulic cylinder 232 is connected to the pressure head 233; the power device 22 is used to drive the movable end of the straightening hydraulic cylinder 232 to reciprocate in the vertical direction, driving the pressure head 233 to apply pressure to the bending part of the drill collar 5 to be straightened or loosen the drill collar 5 to be straightened. Specifically, when straightening the curved part of the drill collar 5 to be straightened, under the driving action of the power device 22, the active end of the straightening hydraulic cylinder 232 moves downward, so that the pressure head 233 contacts the curved part of the drill collar 5 to be straightened, and applies a specified pressure to the curved part of the drill collar 5 to be straightened, so that the curved part of the drill collar 5 to be straightened undergoes reverse deformation, thereby achieving the purpose of straightening; when the straightening is completed, the active end of the straightening hydraulic cylinder 232 is reset (i.e., moves upward) under the driving action of the power device 22, so that the pressure head 233 releases the drill collar 5 to be straightened.

[0072] like Figure 3-Figure 6 As shown, the pressure head 233 includes a pressure head body 71, a main pressure plate 72 and auxiliary pressure plates 73 located on both sides of the main pressure plate 72, the top of the main pressure plate 72 is provided with a first self-locking inclined surface 721, one side of the first self-locking inclined surface 721 is provided with a lifting and lowering adjustment block 74 that can move horizontally, and the lifting and lowering adjustment block 74 is provided with a second self-locking inclined surface 741 that cooperates with the first self-locking inclined surface 721; the auxiliary pressure plate 73 is arranged parallel to the main pressure plate 72, and the auxiliary pressure plate 73 is connected to the pressure head body 71 through a swing shaft 75, and an adjusting nut 731 is provided on the top of the auxiliary pressure plate 73, and the adjusting nut 731 is connected to the adjusting motor 733 located on one side of the auxiliary pressure plate 73 through an adjusting screw rod 732.

[0073] Both sides of the main pressure plate 72 extend outward to form a support portion 722 , and a pre-compression spring 76 is provided between the bottom surface of the support portion 722 and the pressure head body 71 , and the pre-compression spring 76 is used to press the main pressure plate 72 against the lifting and lowering adjustment block 74 .

[0074] The pressure head 233 further includes a rack 77, a lifting adjustment gear 78 and a lifting adjustment motor 79; the lifting adjustment block 74 is connected to the rack 77, the rack 77 is meshed with the lifting adjustment gear 78, and the lifting adjustment gear 78 is connected to the lifting adjustment motor 79; the upper and lower parts of the lifting adjustment block 74 are provided with limiting sliding surfaces, and the pressure head body 71 is provided with a horizontally arranged slide groove 711, and the lifting adjustment block 74 can slide in the slide groove 711 through the limiting sliding surface. When it is necessary to adjust the height of the main pressure plate 72 relative to the auxiliary pressure plate 73, the lifting adjustment motor 79 can be used to drive the lifting adjustment gear 78 to rotate, and then drive the rack 77 to move, and the rack 77 drives the lifting adjustment block 74 to slide horizontally in the slide groove 711; and because the main pressure plate 72 is pressed against the lifting adjustment block 74 by the pre-compression spring 76 in the non-pressure state, the distance of the main pressure plate 72 extending from the pressure head body 71 can be adjusted by driving the lifting adjustment block 74 to translate. In addition, the bending of the drill shank is usually caused by processing accuracy, pressure during placement or its own weight. The degree of bending is limited, and the main pressure plate 72 only needs to be adjusted within a very small range. Therefore, the inclination angles of the first self-locking bevel 721 and the second self-locking bevel 741 are relatively small, generally 5 to 10 degrees. By controlling the surface roughness of the first self-locking bevel 721 and the second self-locking bevel 741, the main pressure plate 72 and the lifting and lowering adjustment block 74 can be self-locked. When the main pressure plate 72 is subjected to a large vertical pressure, the lifting and lowering adjustment block 74 basically does not generate a translational component force, and the operation is more reliable. The lifting and lowering adjustment motor 79 only needs a small power to drive the main pressure plate 72 to rise and fall, which can reduce the space occupied by the driving components.

[0075] It should be noted that the working pressure of the auxiliary pressure plate 73 is mainly transmitted through the swing shaft 75, and the adjustment motor 733 is only used to adjust the angle of the auxiliary pressure plate 73. Since the auxiliary pressure plate 73 is nearly perpendicular to the adjustment screw 732 during operation, the adjustment screw 732 can provide sufficient adjustment power to the auxiliary pressure plate 73, forming three contact points with autonomous displacement capabilities during the straightening process, offsetting part of the internal stress during the straightening process, and avoiding the drill collar from bending again due to the release of internal stress when working in a high temperature environment.

[0076] The power device 22 includes a combination pump 221, which is used to provide pressurized oil to the straightening hydraulic cylinder 232, so that the movable end of the straightening hydraulic cylinder 232 can reciprocate in the vertical direction through the pressurized oil. The maximum working pressure of the combination pump 221 is 50MPa~63MPa;

[0077] The walking device 24 is fixedly mounted on the moving seat 21, and the walking device 24 is slidably connected to the workbench 1, and the walking device 24 is used to drive the moving seat 21 to reciprocate along the length direction of the workbench 1. Since the power device 22 and the straightening device 23 are both mounted on the moving seat 21, the entire straightening module 2 is driven to reciprocate along the length direction of the workbench 1, so that the straightening module 2 moves to the curved part of the drill collar 5 to be straightened, and then the curved part of the drill collar 5 to be straightened is straightened.

[0078] It is worth noting that the maximum working pressure of the hydraulic pump used in traditional drill collar straightening equipment is usually 16Mpa~25Mpa. Since the drill collar has a large gravity and rigidity, in order to deform the drill collar to achieve the purpose of straightening, a straightening force of 500 tons to 800 tons is usually required. In order to meet such high-intensity straightening requirements, the volume of the hydraulic cylinder needs to be made very large. Large-volume hydraulic cylinders not only take up a large space and are difficult to install, but are also not conducive to moving the hydraulic cylinders. Therefore, traditional drill collar straightening equipment can usually only use a fixed hydraulic cylinder method to straighten the curved parts at different positions on the drill collar. The maximum working pressure of the combination pump 221 used in the present invention is 50MPa~63MPa. According to the formula F=Pπ(D / 2) 2 (Where F is the cylinder output, P is the hydraulic pressure, and D is the cylinder diameter) It can be seen that when F remains unchanged, by increasing the pressure of the hydraulic cylinder, the diameter of the hydraulic cylinder can be reduced, thereby reducing the overall volume and weight of the hydraulic cylinder, achieving the effect of cost saving and green environmental protection.

[0079] Preferably, the shape of the pressure head 233 is compatible with the shape of the drill collar 5 to be straightened. Under the action of the straightening hydraulic cylinder 232, the pressure head 233 is used to apply pressure to the curved part of the drill collar 5 to be straightened, so that the curved part of the drill collar 5 to be straightened can be subjected to more uniform force, thereby achieving a better straightening effect and reducing the wear of the drill collar 5 to be straightened.

[0080] In one embodiment, an extrusion groove is provided on a side of the pressure head 233 facing the drill collar 5 to be straightened, and the shape of the extrusion groove is adapted to the shape of the drill collar 5 to be straightened.

[0081] More preferably, the extrusion groove is in an arc shape or an inverted V shape.

[0082] like Figures 1 to 8 As shown, in one embodiment, the walking device 24 includes a walking drive mechanism 241 and a transmission mechanism 242, and the transmission mechanism 242 includes a support seat 2421, a transmission assembly 2422 and a positioning assembly 2423;

[0083] The workbench 1 is provided with a guide rail 6, and the guide rail 6 is installed on the workbench 1 along the length direction of the workbench 1;

[0084] The support seat 2421 is fixedly installed on the moving seat 21, and the transmission component 2422 is installed inside the support seat 2421. The walking drive mechanism 241 is connected to one end of the transmission component 2422, and the other end of the transmission component 2422 is slidably connected to the guide rail 6. The walking drive mechanism 241 is used to drive the transmission component 2422 to rotate axially. Due to the action of friction, the transmission mechanism 242 makes a linear reciprocating motion on the guide rail. Based on the fact that the transmission mechanism 242 is fixedly installed on the moving seat 21, the moving seat 21 is driven to make a linear reciprocating motion on the guide rail 6, thereby driving the entire straightening module 2 to reciprocate along the length direction of the workbench 1.

[0085] The positioning component 2423 is installed on the top of the support seat 2421, and the positioning component 2423 is in contact with the side wall of the workbench 1. Under the action of the positioning component 2423, the transmission mechanism 242 can fit tightly with the workbench 1 when making a linear reciprocating motion on the guide rail 6, so that the installation of the entire straightening module 2 is more secure and the movement is more stable, which is beneficial to improve the straightening accuracy.

[0086] Preferably, the travel drive mechanism 241 is a motor, and the motor and the transmission assembly 2422 are transmission connected.

[0087] Preferably, the travel drive mechanism 241 is a reduction motor, and the shaft of the reduction motor is connected to the transmission assembly 2422 through a coupling, thereby ensuring that the rotation of the motor can be efficiently transmitted to the transmission assembly 2422.

[0088] In one embodiment, the transmission assembly 2422 includes a transmission shaft 24221 and a transmission wheel 24222, wherein the transmission shaft 24221 is installed inside the support seat 2421, one end of the transmission shaft 24221 passes through the support seat 2421 and is transmission-connected to the travel drive mechanism 241, the other end of the transmission shaft 24221 is fixedly connected to the transmission wheel 24222, and the transmission wheel 24222 is slidably connected to the guide rail 6. Under the driving action of the travel drive mechanism 241, the transmission shaft 24221 rotates, thereby driving the transmission wheel 24222 to rotate, so that the transmission wheel 24222 rotates and moves on the guide rail 6;

[0089] The positioning assembly 2423 includes a positioning seat 24231 and a positioning wheel 24232. The positioning seat 24231 is installed on the top of the support seat 2421, and the positioning wheel 24232 is rotatably installed on the positioning seat 24231. The wheel surface of the positioning wheel 24232 abuts against the side wall of the workbench 1, so that the installation and movement of the entire walking device 24 are more stable, which is beneficial to improve the straightening accuracy and efficiency.

[0090] Preferably, the positioning wheel 24232 is rotatably mounted on the positioning seat 24231 via a mounting shaft 24233 .

[0091] In one embodiment, at least two mounting holes for mounting the transmission shaft 24221 are provided inside the support seat 2421, and the transmission shaft 24221 is rotatably mounted in the mounting holes through fixing parts (such as bearings, bushings, locking rings, etc.), thereby ensuring the rotational stability and service life of the transmission shaft 24221.

[0092] like Fig. 9 As shown, in one embodiment, the transmission mechanism 242 is provided with four, and the four transmission mechanisms 242 are symmetrically arranged on both sides of the workbench 1 in pairs, and the four transmission mechanisms 242 are respectively installed at the four corners of the movable seat 21; the transmission component 2422 of one of the transmission mechanisms 242 is transmission-connected with the walking drive mechanism 241, so that the four transmission mechanisms 242 can be driven by one walking drive mechanism 241. By setting four transmission mechanisms 242, the installation of the entire straightening module 2 is further made tighter and firmer, which can effectively improve the stability of the entire straightening module 2.

[0093] In one embodiment, the workbench 1 includes an integrally formed mounting top plate 11, a connecting body 12, and a mounting bottom plate 13, wherein the mounting top plate 12 and the mounting bottom plate 13 are respectively arranged at the top and the bottom of the connecting body 11, and both sides of the mounting top plate 12 and the mounting bottom plate 13 protrude from both sides of the connecting body 11;

[0094] The guide rail 6 is installed on the top surface of the installation bottom plate 13, and the wheel surface of the positioning wheel 24232 abuts against the side wall of the installation top plate 11. By improving the structure of the workbench 1, the workbench 1 is in the shape of an "I", and the moving seat 21, the power device 22, the straightening device 23 and the walking device 24 are installed more compactly and connected as a whole, which can further improve the installation stability and movement stability of the straightening module 2, so that the entire straightening module 2 can stably reciprocate along the length direction of the workbench 1, which is conducive to improving the straightening accuracy and efficiency.

[0095] like Figure 12 to Figure 14 As shown, in one embodiment, the drill collar straightening device further includes a rotating device 4, and the rotating device 4 is used to drive the drill collar 5 to be straightened to make a circular motion along the axial direction, thereby rotating the curved portion of the drill collar 5 to be straightened to below the active end of the straightening hydraulic cylinder 232;

[0096] The rotating device 4 includes a rotating mounting seat 41, a first rotating wheel 42, a second rotating wheel 43 and a rotating driving mechanism 44. The rotating mounting seat 41 is installed on the top of the workbench 1, and the first rotating wheel 42, the second rotating wheel 43 and the rotating driving mechanism 44 are all installed on the rotating mounting seat 41;

[0097] The first rotating wheel 42 and the second rotating wheel 43 are synchronously connected (via a belt or a chain), and the rotating drive mechanism 44 is connected to the first rotating wheel 42, and the rotating drive mechanism 44 is used to drive the first rotating wheel 42 to rotate. The rotating device 4 of this embodiment can quickly change the direction of the drill collar 5 to be straightened, so that the bending direction of the bending part of the drill collar 5 to be straightened is opposite to the pressure direction of the straightening hydraulic cylinder 232, so that an external force opposite to the bending direction is applied to the bending part, so that the drill collar is reversely deformed, thereby achieving the purpose of straightening.

[0098] Preferably, the rotation drive mechanism 44 and the first rotating wheel 42 are connected to each other by a coupling, a pulley or a gear transmission, so as to ensure that the rotation of the rotation drive mechanism 44 can be efficiently transmitted to the first rotating wheel 42.

[0099] Specifically, the rotating device 4 and the supporting device 3 are both installed on the top of the workbench 1. In order to better support and rotate the drill collar 5 to be straightened, preferably, the rotating device 4 is provided with a lifting mechanism, or the supporting device 3 is provided with a lifting mechanism, so that the rotation and supporting functions do not affect each other, and the wear on the surface of the drill collar can be reduced.

[0100] In one embodiment, the rotating device 4 is provided with a lifting mechanism 45, and the rotating device 4 also includes a base 46, the base 46 is fixedly mounted on the top of the workbench 1, the rotating mount 41 and the lifting mechanism 45 are both mounted on the top of the base 46, and the movable end of the lifting mechanism 45 is connected to the rotating mount 41, and the lifting mechanism 45 is used to drive the rotating mount 41 to reciprocate in the vertical reverse direction. During the straightening process, the lifting mechanism 45 is in a retracted state, so that the height of the rotating mount 41 is lower than the height of the supporting device 3, that is, at this time, the drill collar 5 to be straightened placed on the supporting device 3 and the rotating device 4 are not in contact; when a certain curved part of the drill collar 5 to be straightened is straightened, the walking device 24 is first used to drive the straightening module 2 to move to the position corresponding to the next curved part of the drill collar 5 to be straightened, and then the lifting mechanism 45 is started, and the rotating mount 41 is driven to move upward under the driving action of the lifting mechanism 45 until the height of the rotating mount 41 is The drill collar 5 to be straightened is higher than the height of the supporting device 3, so that the drill collar 5 to be straightened is separated from the supporting device 3 and is jointly supported by the first rotating wheel 42 and the second rotating wheel 43; finally, under the driving action of the rotating driving mechanism 44, the first rotating wheel 42 and the second rotating wheel 43 are driven to rotate. Since the surface of the drill collar 5 to be straightened is in contact with the surface of the first rotating wheel 42 and the second rotating wheel 43 at this time, relying on the friction between the rotating wheels and the drill collar 5 to be straightened, the drill collar 5 to be straightened is driven to make a circular motion along the axial direction, thereby changing the bending direction of the curved part of the drill collar 5 to be straightened.

[0101] Preferably, the lifting mechanism 45 can be a cylinder, but is not limited thereto.

[0102] Preferably, the supporting device 3 is provided with a plurality of supporting devices 3, and the plurality of supporting devices 3 are respectively arranged at intervals on the top of the workbench 1, and the upper part of the supporting device 3 is provided with a supporting groove matching the shape of the drill collar 5 to be straightened. Before straightening, the drill collar 5 to be straightened is placed in the supporting groove, and the drill collar 5 to be straightened is fixed on the workbench 1 through the action of the plurality of supporting devices 3. It should be pointed out that since the weight of the drill collar 5 to be straightened is very heavy, which can reach several hundred kilograms or even several tons, the drill collar 5 to be straightened can be stably placed on the supporting device 3 by relying on the weight of the drill collar 5 to be straightened and the cooperation between the drill collar 5 to be straightened and the supporting groove, and the drill collar 5 to be straightened is not easy to shake during the straightening process. In addition, a clamping device (such as a pressure wheel) can also be added to the drill collar straightening equipment to further fix the drill collar 5 to be straightened.

[0103] Preferably, the support groove is in an arc shape or a V shape.

[0104] More preferably, the support groove is in the shape of an arc.

[0105] In one embodiment, the combined pump 221 includes a first hydraulic pump 2211 and a second hydraulic pump 2212, and the oil outlet ends of the first hydraulic pump 2211 and the second hydraulic pump 2212 are respectively connected to the inner cavity of the straightening hydraulic cylinder 23;

[0106] The maximum working pressure of the first hydraulic pump 2211 is greater than the maximum working pressure of the second hydraulic pump 2212 , and the maximum working flow of the first hydraulic pump 2211 is less than the maximum working flow of the second hydraulic pump 2212 .

[0107] Since the maximum working pressure and maximum working flow of the first hydraulic pump 2211 and the second hydraulic pump 2212 are different, the combined pump 221 can supply oil to the straightening hydraulic cylinder 23 at different pressures and flows at the same time, and the two flows can be controlled by the directional valve. In the fast stroke, there is no load, and a large flow and a small pressure are required. The second hydraulic pump 2212 is used to supply oil. Since the flow of the second hydraulic pump 2212 is large, it is ensured that the movable end of the straightening hydraulic cylinder 23 can quickly approach the drill collar 5 to be straightened; when the pressure head 233 presses the drill collar 5 to be straightened, a small flow and a large pressure are required to meet the bending and straightening requirements. Therefore, when the system pressure exceeds the pre-set low pressure value (6MPa~8MPa), it automatically switches to the first hydraulic pump 2211 for oil supply, so that the straightening hydraulic cylinder 23 obtains a larger pressure to ensure that the pressure meets the bending and straightening requirements. The drill collar straightening device of the present invention adopts a combination pump 221 to supply oil to the straightening hydraulic cylinder 23, which can not only make the pressure of the straightening hydraulic cylinder 23 meet the straightening requirements, but also effectively improve the straightening efficiency. If only the second hydraulic pump 2212 is used to supply oil, the system pressure will be low, and the pressure will be difficult to meet the drill collar straightening requirements, so it is necessary to increase the volume of the straightening hydraulic cylinder 23 to increase the straightening pressure; if only the first hydraulic pump 2211 is used to supply oil, since the working pressure of the first hydraulic pump 2211 is relatively high, long-term operation requires more energy consumption, resulting in increased energy consumption of the entire system.

[0108] Specifically, the maximum working pressure of a pump refers to the highest pressure value that the pump can output under normal working conditions. The maximum working pressure of a pump should be less than or equal to its rated pressure to ensure the normal operation of the pump and extend its service life. The unit of maximum working pressure is usually Pascal (Pa) or Megapascal (MPa). The maximum working pressure determines the resistance that the pump can overcome.

[0109] The maximum operating flow rate of a pump refers to the maximum liquid volume flow rate that the pump can output per unit time under specific working conditions. Common units are cubic meters per hour (m / h) or liters per minute (L / min). The maximum operating flow rate reflects the pump's ability to transport liquid.

[0110] In one embodiment, the maximum working pressure of the first hydraulic pump 2211 is 50MPa~63MPa, and the maximum working pressure of the second hydraulic pump 2212 is 10MPa~15MPa. Selecting the first hydraulic pump 2211 and the second hydraulic pump 2212 within the above maximum working pressure range can not only realize the straightening of the drill collar, but also effectively improve the straightening efficiency and significantly reduce the volume and weight of the straightening hydraulic cylinder 23, thereby reducing the weight and occupied space of the entire drill collar straightening equipment.

[0111] In one embodiment of the present invention, the maximum pressure that the first hydraulic pump 2211 can reach during operation is 63 MPa, which is 2.52 times higher than the 25 MPa in the prior art. According to the formula F=Pπ(D / 2): 2 (Wherein, F is the cylinder output, P is the hydraulic pressure, and D is the cylinder diameter) It is calculated that, under the premise of the same cylinder output, the diameter of the straightening hydraulic cylinder 232 is reduced by 1.58 times. While ensuring the straightening pressure, the volume and weight of the whole machine are reduced, achieving the purpose of cost saving and green environmental protection.

[0112] Preferably, the first hydraulic pump 2211 is a radial piston pump, and the second hydraulic pump 2212 is a gear pump.

[0113] like Fig.10 and Fig.11 As shown, in one embodiment, the power device 22 further includes an oil tank 222, a hydraulic drive mechanism 223, a first reversing valve 224 and a second reversing valve 225, the combination pump 221 is installed inside the oil tank 222, the hydraulic drive mechanism 223 is installed outside the oil tank 222, the hydraulic drive mechanism 223 is transmission-connected with the first hydraulic pump 2211, and the first hydraulic pump 2211 is transmission-connected with the second hydraulic pump 2212. Since the first hydraulic pump 2211 and the second hydraulic pump 2212 are transmission-connected, the first hydraulic pump 2211 and the second hydraulic pump 2212 can be driven to work simultaneously by using one hydraulic drive mechanism 223, the hydraulic drive mechanism 223 generates mechanical energy by rotation, and then the first hydraulic pump 2211 and the second hydraulic pump 2212 convert the mechanical energy into hydraulic energy in the straightening hydraulic cylinder 232, the hydraulic oil in the oil tank 222 is pressurized and transported to the straightening hydraulic cylinder 232, and is used to straighten the drill collar 5 to be straightened.

[0114] The oil inlets of the first hydraulic pump 2211 and the second hydraulic pump 2212 are both connected to the oil tank 222, the oil outlet of the first hydraulic pump 2211 is connected to the first oil inlet of the first reversing valve 224, the oil outlet of the second hydraulic pump 2212 is connected to the second oil inlet of the first reversing valve 224, and the oil outlet of the first reversing valve 224 is connected to the oil inlet of the second reversing valve 225. The flow direction of the hydraulic oil from two different hydraulic pumps is controlled and switched by the first reversing valve 224, and flexible adjustments are made in different working stages of straightening, so that the two pumps can work together, which is conducive to improving the straightening efficiency and quality.

[0115] The straightening hydraulic cylinder 232 is provided with a rod chamber 2321 and a rodless chamber 2322 inside, the first oil outlet end of the second reversing valve 225 is in communication with the rod chamber 2321, the second oil outlet end of the second reversing valve 225 is in communication with the rodless chamber 2322, and the oil return end of the second reversing valve 225 is in communication with the oil tank 222. The movement direction of the straightening hydraulic cylinder 232 is controlled by the second reversing valve 225, so that the active end of the straightening hydraulic cylinder 232 can apply pressure to the drill collar 5 to be straightened to achieve the straightening effect, and after straightening, the active end of the straightening hydraulic cylinder 232 is retracted to release the drill collar 5 to be straightened.

[0116] Preferably, the first reversing valve 224 is a two-position three-way reversing valve.

[0117] Preferably, the second reversing valve 225 is a two-position four-way reversing valve.

[0118] Specifically, the shell of the first hydraulic pump 2211 is made into a shape that can be connected to the flange of the second hydraulic pump 2212, so that the first hydraulic pump 2211 and the second hydraulic pump 2212 can be assembled to form a combined pump 221. The rotating shaft of the first hydraulic pump 2211 is connected to the hydraulic drive mechanism 223 (such as a motor) through a coupling. The driving torque is input into the first hydraulic pump 2211 through the hydraulic drive mechanism 223 and transmitted to the second hydraulic pump 2212 through the hollow shaft.

[0119] Preferably, the hydraulic drive mechanism 223 is a motor.

[0120] In one embodiment, the straightening module 2 further includes a hydraulic oil filter 25, and the hydraulic oil filter 25 is installed on the moving seat 21;

[0121] The oil return end of the second reversing valve 225 is connected to the input end of the hydraulic oil filter 25 , and the output end of the hydraulic oil filter 25 is connected to the oil tank 222 . The hydraulic oil filter 25 is used to remove impurities in the hydraulic oil.

[0122] It is worth noting that, since the first hydraulic pump 2211 used in the present invention is a radial piston pump, the radial piston pump has very high requirements for the cleanliness of the hydraulic oil. By setting a hydraulic oil filter 25 at the return oil end of the second reversing valve 225 and the oil tank 222, impurities such as iron filings and dust in the hydraulic oil can be effectively removed to obtain hydraulic oil with higher cleanliness, which is beneficial to protect the radial piston pump, ensure that the radial piston pump can work efficiently for a long time, extend the service life of the radial piston pump, and then ensure that the drill collar straightening work is carried out continuously and efficiently, and reduce equipment maintenance. In addition, for the original hydraulic oil added to the oil tank 222, preferably, new hydraulic oil with higher cleanliness is selected, or hydraulic oil with a cleanliness standard obtained after filtering and impurity removal is selected.

[0123] Specifically, the hydraulic oil filter 25 is a filter that can be used to filter impurities such as iron filings and dust in the hydraulic oil, thereby achieving the function of removing impurities and purifying the hydraulic oil. The hydraulic oil filter 25 of the present invention can be a commercially available hydraulic oil filter.

[0124] Correspondingly, the present invention also discloses a drill collar straightening method, which uses the above-mentioned drill collar straightening device and comprises the following steps:

[0125] (1) Place the drill collar to be straightened on the support device;

[0126] (2) measuring the curvature of the drill collar to be straightened, determining and recording a number of curvatures of the drill collar to be straightened and the curvature value corresponding to each curvature;

[0127] (3) moving the straightening module to the bending portion and applying pressure for the first time, so that the bending portion undergoes the first deformation;

[0128] (4) separating the straightening module from the bending portion;

[0129] (5) moving the straightening module to the bent portion and applying pressure for a second time, so that the bent portion undergoes a second deformation;

[0130] (6) When the straightness of the bent portion reaches the expected straightening requirement, stop applying pressure and continue to keep the straightening module in contact with the bent portion for a preset time;

[0131] (7) Separating the straightening module from the bending portion.

[0132] The drill collar straightening method of the present invention adopts a straightening method of multi-stage pressure application and pressure point control, which can improve the straightening accuracy and reduce the stress accumulation of the workpiece after straightening, avoiding the stress release of the workpiece in a high-temperature working environment, causing the drill collar to bend again.

[0133] In one embodiment, in step (2), the curvature of the drill collar to be straightened is measured, and several curvatures of the drill collar to be straightened and the curvature values ​​corresponding to each curvature are determined and recorded. Specifically, the several curvatures can be recorded as a first curvature, a second curvature, ... and an nth curvature, where n is equal to the number of curvatures; the drill collar to be straightened is tested to find several curvatures of the drill collar to be straightened and the maximum deformation point corresponding to each curvature.

[0134] In one embodiment, in step (2), the drill collar to be straightened is inspected by a runout detector or a laser detection device to find several bending parts of the drill collar to be straightened and the maximum deformation point corresponding to each bending part.

[0135] Specifically, when a run-out detector is used to detect the drill collar to be straightened, the following method can be used: a plurality of run-out detectors are arranged at intervals on the workbench 1, and the drill collar to be straightened is slowly rotated during detection, and the straightness of the drill collar to be straightened is detected by multiple run-out detectors, and the run-out detector is connected to an external data acquisition system, and data can be transmitted via wired (such as SB, Ethernet, etc.) or wireless (such as Bluetooth, Wi-Fi, etc.) methods, and professional data processing software is used to perform real-time analysis on the collected data, calculate the straightness of the drill collar, and identify the bending parts and the maximum deformation points.

[0136] Preferably, multiple run-out detectors are installed in the same mobile device, and the multiple run-out detectors are installed on the workbench 1 through the mobile device, so that the multiple run-out detectors can be synchronously moved along the length direction of the drill collar to be straightened, thereby completing the straightness detection of the entire drill collar to be straightened, and finding several bending parts of the drill collar to be straightened and the maximum deformation point corresponding to each bending part.

[0137] Specifically, the moving device includes a moving track and a driving source (such as a motor), and multiple run-out detectors are installed on the moving track, and the run-out detectors are connected to the driving source through a transmission member such as a synchronous belt, a chain or a gear rack 77, so that the run-out detectors can move along the length direction of the drill collar to be straightened. When performing the test, the driving source is started, so that the multiple run-out detectors move synchronously along the length direction of the drill collar to be straightened at a set speed, and the run-out data of the drill collar surface is collected in real time during the movement process.

[0138] Specifically, when a laser detection device is used to detect the drill collar to be straightened, the following method can be used: For example, a laser displacement sensor can be selected as the laser detection device, and the laser displacement sensor can be installed in a suitable position so that it can irradiate the surface of the drill collar to be straightened. The laser displacement sensor emits a laser beam and calculates the distance between the drill collar surface and the sensor by measuring the time or angle of the laser beam reflected back. By moving the sensor along the length of the drill collar or rotating the drill collar at a constant speed, the sensor will collect a series of distance data. By analyzing this data, the shape profile of the drill collar can be obtained, thereby determining several bending parts of the drill collar to be straightened and the maximum deformation point corresponding to each bending part.

[0139] In addition, a control system is also provided on the drill collar straightening equipment. After the data obtained by the runout detector or the laser detection device are collected and analyzed by the data acquisition system, several bending parts of the drill collar to be straightened and the maximum deformation point corresponding to each bending part are obtained. The control system can calculate the specific data such as the straightening force and holding time required for each bending part in the drill collar to be straightened according to the diameter, length, material, deformation amount and other characteristics of the drill collar to be straightened. Then, the control system can control the applied pressure and holding time of the straightening hydraulic cylinder, so as to quickly complete the straightening of the workpiece and avoid damaging the drill collar to be straightened due to excessive pressure.

[0140] In one embodiment, the original deformation of the maximum deformation point in the bending part before pressure is applied is S1, and the deformation of the bending part after the first pressure is S2, S2=(0.3~0.6)S1. Preferably, S2=(0.35~0.55)S1. The first pressure applied by the present invention controls the deformation to 30-60% of the original deformation, that is, S2=(0.3~0.6)S1, which can pave the way for the second pressure application, improve the straightening accuracy, and reduce the stress accumulation of the workpiece after straightening. After the second pressure application, the deformation is controlled to (0.4~0.7)S1, so that the straightness of the bending part meets the expected straightening requirements, effectively improves the straightening accuracy, and avoids the stress release of the workpiece in a high-temperature working environment, causing the drill collar to bend again.

[0141] The step of moving the straightening module to the bending part and applying pressure for the first time to cause the bending part to deform for the first time comprises:

[0142] Move the straightening module to the curved part and align the main pressure plate with the maximum deformation point of the curved part; adjust the installation height of the main pressure plate according to the bending value of the curved part, so that the working surfaces of the main pressure plate and the auxiliary pressure plates on both sides fit the curved surface of the drill collar to be straightened;

[0143] Driven by the power device, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply the first pressure to the bending part, and drive the auxiliary pressure plate to swing to a predetermined angle, so that the bending part undergoes the first deformation.

[0144] In this embodiment, when the straightening module is moved to the bending part and the first pressure is applied, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply the first pressure to the bending part, and at the same time drive the auxiliary pressure plate to swing to a predetermined angle, so that the bending part is deformed for the first time. The working pressure of the auxiliary pressure plate is mainly transmitted through the swing shaft, and the adjustment motor is only used to adjust the angle of the auxiliary pressure plate. Since the auxiliary pressure plate is nearly perpendicular to the adjustment screw during work, the adjustment screw can provide sufficient adjustment power to the auxiliary pressure plate, forming three contact points with autonomous displacement capabilities during the straightening process, offsetting part of the internal stress during the straightening process, and avoiding the drill collar from bending again due to the release of internal stress when working in high temperature environment.

[0145] The step of moving the straightening module to the bent portion and applying pressure for a second time to cause the bent portion to deform for a second time comprises:

[0146] Move the straightening module to the curved part and align the main pressure plate with the maximum deformation point of the curved part; adjust the installation height of the main pressure plate according to the bending value of the curved part, so that the working surfaces of the main pressure plate and the auxiliary pressure plates on both sides fit the curved surface of the drill collar to be straightened;

[0147] Driven by the power device, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply pressure to the bending part for the second time, and drive the auxiliary pressure plate to swing to a predetermined angle or keep the auxiliary pressure plate stationary, so that the bending part undergoes a second deformation.

[0148] In this embodiment, when the straightening module is moved to the bent part and the second pressure is applied, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bent part and apply the second pressure to the bent part, and at the same time, the auxiliary pressure plate is driven to swing a predetermined angle, or the auxiliary pressure plate remains stationary, so that the bent part is deformed for the second time. When the second pressure is applied, the swing of the auxiliary pressure plate can be flexibly adjusted according to the material, shape and performance requirements of the workpiece to meet the performance requirements.

[0149] When the auxiliary pressure plate swings to a predetermined angle, the working pressure of the auxiliary pressure plate is mainly transmitted through the swing shaft, and the adjustment motor is only used to adjust the angle of the auxiliary pressure plate. Since the auxiliary pressure plate is nearly perpendicular to the adjustment screw during operation, the adjustment screw can provide sufficient adjustment power to the auxiliary pressure plate, forming three contact points with autonomous displacement capabilities during the straightening process, offsetting part of the internal stress during the straightening process, and avoiding the drill collar from bending again due to the release of internal stress when working in a high temperature environment.

[0150] When the auxiliary pressure plate is stationary, it can provide a more stable downward force and cooperate with the main pressure plate to form three contact points with fixed distances during the straightening process, thereby preventing the contact point between the auxiliary pressure plate and the drill collar from moving toward the main pressure plate during the straightening process.

[0151] In summary, the drill collar straightening method of the present invention adopts a straightening method with multi-stage pressure and pressure point control, which can improve the straightening accuracy and reduce the stress accumulation of the workpiece after straightening, avoiding the stress release of the workpiece in a high-temperature working environment, causing the drill collar to bend again.

[0152] Moreover, the original deformation of the maximum deformation point in the bending part of the present invention before pressure is applied is S1, and the deformation of the bending part after the first pressure is S2, S2 = (0.3~0.6) S1. And by controlling the two pressure processes, specifically controlling the pressure of the main pressure plate and the auxiliary pressure plate in the first deformation, and the swing angle of the auxiliary pressure plate, controlling the pressure of the main pressure plate and the auxiliary pressure plate in the second deformation, and whether the auxiliary pressure plate swings, automatic straightening is achieved and the accuracy of straightening is improved.

[0153] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A drill collar straightening device, characterized in that: It comprises a workbench, a straightening module and a supporting device, wherein the supporting device is installed on the top of the workbench and is used to support the drill collar to be straightened; The straightening module comprises a moving seat, a power device, a straightening device and a walking device, and the straightening device comprises a fixing mechanism, a straightening hydraulic cylinder and a pressure head; the moving seat is slidably mounted on the bottom end of the workbench, the power device and the fixing mechanism are respectively mounted on the moving seat, the straightening hydraulic cylinder is mounted on the fixing mechanism, and the straightening hydraulic cylinder is located above the workbench, and the movable end of the straightening hydraulic cylinder is connected to the pressure head; the power device is used to drive the movable end of the straightening hydraulic cylinder to reciprocate in the vertical direction, driving the pressure head to apply pressure to the bending part of the drill collar to be straightened or to loosen the drill collar to be straightened; The power device includes a combination pump, which is used to provide pressurized hydraulic oil into the straightening hydraulic cylinder; The walking device is fixedly mounted on the moving seat, and the walking device is slidably connected to the workbench, and the walking device is used to drive the moving seat to reciprocate along the length direction of the workbench; The pressure head includes a pressure head body, a main pressure plate and auxiliary pressure plates located on both sides of the main pressure plate, the top of the main pressure plate is provided with a first self-locking inclined surface, one side of the first self-locking inclined surface is provided with a lifting and lowering adjustment block that can move horizontally, and the lifting and lowering adjustment block is provided with a second self-locking inclined surface that cooperates with the first self-locking inclined surface; the auxiliary pressure plate is arranged parallel to the main pressure plate, the auxiliary pressure plate is connected to the pressure head body through a swing shaft, the top of the auxiliary pressure plate is provided with an adjusting nut, and the adjusting nut is connected to the adjusting motor located on one side of the auxiliary pressure plate through an adjusting screw.

2. The drill collar straightening device according to claim 1, characterized in that: The pressure head also includes a rack, a lifting and lowering adjustment gear and a lifting and lowering adjustment motor; the lifting and lowering adjustment block is connected to the rack, the rack is meshed with the lifting and lowering adjustment gear, and the lifting and lowering adjustment gear is connected to the lifting and lowering adjustment motor; the upper and lower parts of the lifting and lowering adjustment block are provided with limiting sliding surfaces, and a horizontally arranged sliding groove is provided in the pressure head body, and the lifting and lowering adjustment block can slide in the sliding groove through the limiting sliding surface.

3. The drill collar straightening device according to claim 1, characterized in that: Both sides of the main pressure plate extend outward to form a supporting portion, and a pre-compression spring is provided between the bottom surface of the supporting portion and the pressure head body, and the pre-compression spring is used to press the main pressure plate tightly onto the lifting and lowering adjustment block.

4. The drill collar straightening device according to claim 1, characterized in that: The walking device comprises a walking drive mechanism and a transmission mechanism, and the transmission mechanism comprises a support seat, a transmission assembly and a positioning assembly; The workbench is provided with a guide rail, and the guide rail is installed on the workbench along the length direction of the workbench; The support seat is fixedly mounted on the moving seat, the transmission assembly is mounted inside the support seat, the travel drive mechanism is in transmission connection with one end of the transmission assembly, the other end of the transmission assembly is in sliding connection with the guide rail, and the travel drive mechanism is used to drive the transmission assembly to perform rotational motion along the axial direction; The positioning assembly is installed on the top of the support seat, and the positioning assembly abuts against the side wall of the workbench; The transmission assembly includes a transmission shaft and a transmission wheel, wherein the transmission shaft is installed inside the support seat, one end of the transmission shaft passes through the support seat and is transmission-connected to the travel drive mechanism, the other end of the transmission shaft is fixedly connected to the transmission wheel, and the transmission wheel is slidably connected to the guide rail; The positioning assembly comprises a positioning seat and a positioning wheel. The positioning seat is mounted on the top of the supporting seat. The positioning wheel is rotatably mounted on the positioning seat. The wheel surface of the positioning wheel abuts against the side wall of the workbench.

5. The drill collar straightening device according to claim 1, characterized in that: The combined pump comprises a first hydraulic pump and a second hydraulic pump, and the oil outlet ends of the first hydraulic pump and the second hydraulic pump are respectively connected to the inner cavity of the straightening hydraulic cylinder; The maximum working pressure of the first hydraulic pump is greater than the maximum working pressure of the second hydraulic pump, and the maximum working flow of the first hydraulic pump is less than the maximum working flow of the second hydraulic pump; the maximum working pressure of the first hydraulic pump is 50MPa~63MPa, and the maximum working pressure of the second hydraulic pump is 10MPa~15MPa.

6. The drill collar straightening device according to claim 5, characterized in that: The power device further comprises an oil tank, a hydraulic drive mechanism, a first reversing valve and a second reversing valve, the combined pump is installed inside the oil tank, the hydraulic drive mechanism is installed outside the oil tank, the hydraulic drive mechanism is transmission-connected to the first hydraulic pump, and the first hydraulic pump is transmission-connected to the second hydraulic pump; The oil inlets of the first hydraulic pump and the second hydraulic pump are both connected to the oil tank, the oil outlet of the first hydraulic pump is connected to the first oil inlet of the first reversing valve, the oil outlet of the second hydraulic pump is connected to the second oil inlet of the first reversing valve, and the oil outlet of the first reversing valve is connected to the oil inlet of the second reversing valve; The straightening hydraulic cylinder is provided with a rod chamber and a rodless chamber inside, the first oil outlet end of the second reversing valve is connected to the rod chamber, the second oil outlet end of the second reversing valve is connected to the rodless chamber, and the oil return end of the second reversing valve is connected to the oil tank.

7. A drill collar straightening method, characterized in that: The drill collar straightening device according to any one of claims 1 to 6 comprises the following steps: (1) Place the drill collar to be straightened on the support device; (2) measuring the curvature of the drill collar to be straightened, determining and recording a number of curvatures of the drill collar to be straightened and the curvature value corresponding to each curvature; (3) moving the straightening module to the bending portion and applying pressure for the first time, so that the bending portion undergoes the first deformation; (4) separating the straightening module from the bending portion; (5) moving the straightening module to the bent portion and applying pressure for a second time, so that the bent portion undergoes a second deformation; (6) When the straightness of the bent portion reaches the expected straightening requirement, stop applying pressure and continue to keep the straightening module in contact with the bent portion for a preset time; (7) Separating the straightening module from the bending portion.

8. The drill collar straightening method according to claim 7, characterized in that: The original deformation amount of the maximum deformation point in the bending part before pressure is applied is S1, and the deformation amount of the bending part after the first pressure is applied is S2, S2=(0.3~0.6)S1.

9. The drill collar straightening method according to claim 7, characterized in that: The step of moving the straightening module to the bending part and applying pressure for the first time to cause the bending part to deform for the first time comprises: Move the straightening module to the curved part and align the main pressure plate with the maximum deformation point of the curved part; adjust the installation height of the main pressure plate according to the bending value of the curved part, so that the working surfaces of the main pressure plate and the auxiliary pressure plates on both sides fit the curved surface of the drill collar to be straightened; Driven by the power device, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply the first pressure to the bending part, and drive the auxiliary pressure plate to swing to a predetermined angle, so that the bending part undergoes the first deformation.

10. The drill collar straightening method according to claim 7, characterized in that: The step of moving the straightening module to the bent portion and applying pressure for a second time to cause the bent portion to deform for a second time comprises: Move the straightening module to the curved part and align the main pressure plate with the maximum deformation point of the curved part; adjust the installation height of the main pressure plate according to the bending value of the curved part, so that the working surfaces of the main pressure plate and the auxiliary pressure plates on both sides fit the curved surface of the drill collar to be straightened; Driven by the power device, the movable end of the straightening hydraulic cylinder moves downward, the main pressure plate and the auxiliary pressure plate contact the bending part and apply pressure to the bending part for the second time, and drive the auxiliary pressure plate to swing to a predetermined angle or keep the auxiliary pressure plate stationary, so that the bending part undergoes a second deformation.

Images