A well joint centralizer

Abstract

The utility model discloses a well drilling joint centralizing device relates to well drilling auxiliary tool technical field, through the horizontal setting connecting rod and support ring, both ends are connected through fixed support leg, is equipped with with the water nozzle fixed link of support ring same axis in the center of connecting rod top surface, and connecting rod hinged setting has movable support leg, and movable support leg is L shape movable support leg, and movable support leg's bottom is movably connected with connecting rod, and top is movably connected with support ring, and through relative connecting rod rotation, realize unfolding or accomodating, and through multiple correction holes are set up in the circumference of support ring, and install joint correction jackscrew in correction hole, and the joint in support ring is righted, can be folded accomodating while righting joint, reduce the space occupied, simple structure, convenient on -the -spot handling and quick deployment, be applicable to field well site etc. Operating environment, effectively improve the flexibility and response efficiency of on -the -spot operation.

Description

Technical Field

[0001] This utility model relates to the field of drilling auxiliary tools technology, specifically to a drilling joint straightening device. Background Technology

[0002] In oil drilling operations, drilling is a complex engineering project that relies heavily on mechanical equipment and professional technology. It requires drilling downwards or laterally from a predetermined location on the surface to form a wellbore of a certain depth in order to develop oil and gas resources.

[0003] During drilling, as the well depth increases, it is necessary to continuously connect various drilling tools and downhole equipment to ensure the continuity of drilling operations and successful access to the target producing formation. However, due to differences in the connection methods (such as thread specifications and thread type structures) between different drilling tools and downhole equipment, effective connections are usually achieved using adapters or mating joints.

[0004] Due to the large size and weight of drilling tools and their joints, relying entirely on manual methods for connection and disassembly is not only cumbersome and inefficient, but also poses a significant challenge to operators and increases the risk of slippage, especially when drilling fluid or other lubricating media adhere to the joint surfaces, thus substantially extending the loading and unloading time. To improve efficiency and safety, some drilling teams have introduced hydraulic tongs systems to assist in the connection and disassembly of joints.

[0005] However, during the uncoupling process, to prevent the joint from shifting, slipping, or even falling into the well, a joint straightening device is still required for support and positioning. Existing joint straightening devices mostly adopt a rigid integrated structure, mainly composed of fixed connecting rods, rigid columns, and limiting rings. These devices generally suffer from being bulky and cumbersome, making them difficult to handle and carry, especially in field well site conditions, where transportation and deployment are challenging, severely impacting on-site operational efficiency and response speed. Utility Model Content

[0006] The purpose of this invention is to provide a drilling joint straightening device that can quickly straighten drilling joints. It has a simple structure, small size, effectively reduces the space occupied, facilitates on-site transportation and rapid deployment, and is suitable for field well sites and other operating environments, effectively improving the flexibility and response efficiency of on-site operations.

[0007] To address the aforementioned technical problems, this utility model provides a drilling joint straightening device, comprising a horizontally arranged connecting rod and a support ring. Fixed legs are provided at both ends of the connecting rod, and are fixedly connected to the corresponding ends of the support ring via the fixed legs. A water nozzle fixing rod, coaxial with the support ring, is provided at the center of the top surface of the connecting rod. A movable leg, L-shaped, is hinged to the connecting rod. The bottom of the movable leg is movably connected to the connecting rod, and the top of the movable leg is movably connected to the support ring. The movable leg can be unfolded or retracted by rotating relative to the connecting rod. Multiple correction holes are circumferentially arranged on the support ring, and joint correction screws are installed in the correction holes for straightening the joint within the support ring.

[0008] The number of the correction holes is greater than or equal to 3, and the multiple correction holes are evenly distributed around the support ring.

[0009] It also includes connecting lugs disposed on both sides of the connecting rod and the water nozzle fixing rod. The connecting lugs are provided with hinge holes, and a positioning pin is disposed in the hinge holes. The positioning pin passes through the lower end of the movable leg and is rotatably connected to the movable leg.

[0010] It also includes an unfolding socket, a storage socket, and a locking component disposed on the connecting ear plate. The locking component is used to lock the movable support leg in the unfolded state by being installed in the unfolding socket, and to lock the support leg in the storage state by being installed in the storage socket.

[0011] Wherein, the line connecting the unfolding insertion hole and the hinge hole of the movable support leg is perpendicular to the length direction of the connecting rod, and the line connecting the storage insertion hole and the hinge hole of the movable support leg is parallel to the length direction of the connecting rod.

[0012] The connecting lug includes an upper connecting lug located on the upper side of the connecting rod and a lower connecting lug located on the lower side of the connecting rod.

[0013] It also includes a pad block disposed at the bottom of the movable outrigger, the bottom surface of the pad block being flush with the bottom surface of the connecting rod.

[0014] The number of movable support legs is greater than or equal to 2, and the multiple movable support legs are evenly distributed on opposite sides of the water nozzle fixing rod.

[0015] It also includes a first fixed ear plate disposed on the upper end of the movable support leg, and a first fixed seat is provided on the support ring, and the first fixed seat is movably connected to the first fixed ear plate to realize the movable connection with the movable support leg.

[0016] It also includes a second fixing lug plate disposed on the upper end of the fixed support leg, and the support ring is provided with a second fixing seat. The fixed support leg and the support ring are fixed by bolts connecting the second fixing lug plate and the second fixing seat.

[0017] The drilling joint straightening device provided in this embodiment of the invention has the following advantages compared with the prior art:

[0018] The drilling joint straightening device provided in this embodiment of the utility model consists of a horizontally arranged connecting rod and a support ring, with both ends connected by fixed legs. A water nozzle fixing rod coaxial with the support ring is provided at the center of the top surface of the connecting rod. The connecting rod is hinged to a movable leg, which is L-shaped. The bottom of the movable leg is movably connected to the connecting rod, and the top is movably connected to the support ring. It can be unfolded or retracted by rotating relative to the connecting rod. Multiple correction holes are provided around the support ring, and joint correction screws are installed in the correction holes to straighten the joint inside the support ring. The device can straighten the joint while folding and storing it, reducing space occupation. It has a simple structure, is easy to transport and deploy quickly on site, and is suitable for field well sites and other operating environments, effectively improving the flexibility and response efficiency of on-site operations. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A front view of the unfolded structure of an embodiment of the drilling joint straightening device provided by this utility model;

[0021] Figure 2 A top view of the unfolded structure of an embodiment of the drilling joint straightening device provided by this utility model;

[0022] Figure 3 A schematic diagram of the front structure of a drill joint straightening device provided by this utility model in its stowed state;

[0023] Figure 4 A top view of the stowed structure of an embodiment of the drilling joint straightening device provided by this utility model;

[0024] Among them, 1-connecting rod, 2-support ring, 3-water nozzle fixing rod, 4-movable support leg, 5-pad, 6-fixed support leg, 7-connector alignment screw, 8-connecting ear plate, 9-positioning pin, 10-locking pin, 11-storage insertion hole, 12-expanding insertion hole, 13-first fixed ear plate, 14-first fixing bolt, 15-second fixing seat, 16-first fixed ear plate, 17-first fixing bolt, 18-first fixing seat. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please refer to Figures 1-4 , Figure 1 A front view of the unfolded structure of an embodiment of the drilling joint straightening device provided by this utility model; Figure 2 A top view of the unfolded structure of an embodiment of the drilling joint straightening device provided by this utility model; Figure 3 A schematic diagram of the front structure of a drill joint straightening device provided by this utility model in its stowed state; Figure 4 This is a top view of the stowed structure of one embodiment of the drilling joint straightening device provided by this utility model.

[0027] In one specific embodiment, the drilling joint straightening device includes a horizontally arranged connecting rod 1 and a support ring 2. Fixed legs 6 are provided at both ends of the connecting rod 1 and are fixedly connected to the corresponding ends of the support ring 2 via the fixed legs 6. A water nozzle fixing rod 3, coaxial with the support ring 2, is provided at the center of the top surface of the connecting rod 1. A movable leg 4, L-shaped, is hinged to the connecting rod 1. The bottom of the movable leg 4 is movably connected to the connecting rod 1, and the top of the movable leg 4 is movably connected to the support ring 2. It can be unfolded or retracted by rotating relative to the connecting rod 1. Multiple correction holes are circumferentially arranged on the support ring 2, and joint correction screws 7 are installed in the correction holes for straightening the joint within the support ring 2.

[0028] The system consists of a horizontally arranged connecting rod 1 and a support ring 2, connected at both ends by fixed legs 6. A water nozzle fixing rod 3, coaxial with the support ring 2, is located at the center of the top surface of the connecting rod 1. The connecting rod 1 is hinged with a movable leg 4, which is L-shaped. The bottom of the movable leg 4 is movably connected to the connecting rod 1, and the top is movably connected to the support ring 2. It can be unfolded or folded by rotating relative to the connecting rod 1. Multiple correction holes are set around the support ring 2, and a connector correction screw 7 is installed in the correction holes to straighten the connector inside the support ring 2. The connector can be straightened and folded for storage at the same time, reducing space occupation. The structure is simple, easy to transport and deploy on site, and suitable for field well sites and other operating environments, effectively improving the flexibility and response efficiency of on-site operations.

[0029] In this application, the drilling joint is supported by setting movable support legs 4 and fixed support legs 6, and then the joint correction screws 7 set by the correction holes in the support ring 2 are used for correction and straightening. The number of correction holes is greater than or equal to 3, and the multiple correction holes are evenly distributed around the support ring 2.

[0030] By setting three or more correction holes and distributing them evenly around the support ring, straightening operations can be performed from multiple directions, and the adjustment is relatively easy.

[0031] This application does not limit the number, size, or distribution of the calibration holes.

[0032] To further facilitate the connection of the movable outrigger 4, in one embodiment, the drilling joint straightening device further includes connecting lugs 8 disposed on the connecting rod 1 and located on both sides of the water nozzle fixing rod 3. The connecting lugs 8 have hinge holes, and a positioning pin 9 is disposed in the hinge holes. The positioning pin 9 passes through the lower end of the movable outrigger 4 and is rotatably connected to the movable outrigger 4.

[0033] By setting connecting ear plates 8 on both sides of the water nozzle fixing rod 3 and setting hinge holes thereon, it is not necessary to set hinge holes directly on the connecting rod 1. This allows the movable support leg 4 to be installed on the connecting ear plate 8 instead of directly on the connecting rod 1. The connection position and the size of the hinge hole can also be set freely, avoiding damage to the connecting rod 1 caused by the rotation of the movable support leg 4 during use. At the same time, the setting of the connecting ear plate 8 also increases the convenience of space setting.

[0034] This application does not impose any restrictions on the structure, material, or installation method of the connecting ear plate 8.

[0035] To further increase stability during the straightening process, in one embodiment, the drilling joint straightening device further includes an unfolding socket 12, a storage socket 11, and a locking component disposed on the connecting lug 8. The locking component is used to lock the movable outrigger 4 in the unfolded state by being installed in the unfolding socket 12, and in the storage state by being installed in the storage socket 11.

[0036] By providing an unfolding socket 12, a storage socket 11, and a locking assembly on the connecting ear plate 8, when the entire device is in the unfolded state, the movable leg 4 rotates to the position of the unfolding socket 12, and the locking assembly locks the movable leg 4 to the connecting ear plate 8, ensuring reliability. Similarly, in the stored state, the position is locked through the storage socket 11.

[0037] This application does not limit the position or size of the opening and storage holes 11, nor does it limit the structure or locking method of the locking components. Position locking can be achieved by means of locking pin 10, or by using clamping components. For example, after rotating to a specified position, the positions of the movable leg 4 and the fixed leg 6 can be clamped and fixed by clamping components, thus ensuring reliable use.

[0038] In this application, the position of the movable support leg 4 in the unfolded state and the retracted state is not limited. In one embodiment, in order to improve the utilization efficiency of the movable support leg 4, the line connecting the unfolded insertion hole 12 and the hinge hole of the movable support leg 4 is perpendicular to the length direction of the connecting rod 1, and the line connecting the retracted insertion hole 11 and the hinge hole of the movable support leg 4 is parallel to the length direction of the connecting rod 1.

[0039] In addition, multiple movable legs 4 can be used, with the included angle between adjacent movable legs 4 and fixed legs 6 being 30 degrees, 45 degrees, 60 degrees, etc., to achieve multi-leg fixation.

[0040] To further ensure the stability of the hinge, in one embodiment, the connecting lug 8 includes an upper connecting lug located on the upper side of the connecting rod 1 and a lower connecting lug located on the lower side of the connecting rod 1.

[0041] By adopting an upper connecting ear plate and a lower connecting ear plate structure for the connecting ear plate 8, the connecting ear plate 8 will not bend during rotation and subsequent support, and will not cause damage to the related hinge holes, mounting holes, etc.

[0042] This application does not limit the number or position of the connecting ear plates 8.

[0043] In addition, a support pad 5 can be set between the upper connecting ear plate and the lower connecting ear plate to ensure the stability of the structure.

[0044] To further ensure stability during use and guarantee the stability and reliability of the support, in one embodiment, the drilling joint straightening device further includes a pad 5 disposed at the bottom of the movable outrigger 4, the bottom surface of the pad 5 being flush with the bottom surface of the connecting rod 1.

[0045] By setting a pad 5 at the bottom of the movable support leg 4, the bottom surface of the pad 5 is flush with the bottom surface of the connecting rod 1, so that it will not tilt during the support process, thus ensuring the safety and reliability of use.

[0046] This application does not limit the quantity, size, or installation method of the pads 5; they can be connected by snap-fit, adhesive, bolt, or other methods.

[0047] The number of movable support legs 4 is not limited in this application. The number of movable support legs 4 is greater than or equal to 2, and the multiple movable support legs 4 are evenly distributed on opposite sides of the water nozzle fixing rod 3.

[0048] This application also includes a first fixed ear plate 16 disposed on the upper end of the movable support leg 4, and a first fixed seat 18 disposed on the support ring 2, and the first fixed seat 18 is movably connected to the first fixed ear plate 16 to realize the movable connection with the movable support leg 4.

[0049] By setting a first fixing seat 18 on the support ring 2, it can be fixed by snap-fit ​​or bolt connection. The first fixing seat 18 is movably connected to the first fixing ear plate 16, realizing the movable connection with the movable support leg 4. This avoids direct installation on the support ring 2, reduces damage to the support ring 2 by increasing the contact area, and also improves the ease of installation by adjusting the connection position.

[0050] This application does not limit the structure, size, material, or connection method of the first fixing seat 18 and the first fixing ear plate 16.

[0051] Similarly, to facilitate the connection between the fixed leg 6 and the support ring 2, in one embodiment, the drilling joint straightening device further includes a second fixing lug 13 disposed on the upper end of the fixed leg 6, and the support ring 2 is provided with a second fixing seat 15. The fixed leg 6 and the support ring 2 are fixed by bolting together the second fixing lug 13 and the second fixing seat 15.

[0052] By using a second fixing ear plate 13 at the upper end of the fixed leg 6 and a second fixing seat 15 on the support ring 2, the fixed leg 6 and the support ring 2 are fixed by bolting the second fixing ear plate 13 and the second fixing seat 15, which can improve the convenience of connection and reduce the space occupied by the support ring 2.

[0053] In one embodiment, the drilling joint straightening device includes a connecting rod 1 and a support ring 2. A water nozzle fixing rod 3 is provided at the center of the top surface of the connecting rod 1. L-shaped movable legs 4 are hinged to both sides of the water nozzle fixing rod 3 on the connecting rod 1, and a locking component for locking the position of the movable legs 4 is provided. A pad 5 is provided at the bottom of the movable legs 4, and the bottom surface of the pad 5 is flush with the bottom surface of the connecting rod 1. Fixed legs 6 are fixedly provided on the top surfaces of both ends of the connecting rod 11. The support ring 2 is located above the connecting rod 1 and is coaxial with the water nozzle fixing rod 3. The four sides of the support ring 2 are detachably connected to the upper ends of the corresponding movable legs 4 and fixed legs 6. Multiple threaded joint straightening screws 7 are evenly arranged along the circumferential direction on the outer periphery of the support ring 2.

[0054] The specific usage method of this drilling joint straightening device is as follows:

[0055] First, unfold the movable support leg 4 from its retracted state and lock its position perpendicular to the connecting rod 1 using the locking component. This allows the connecting rod 1 and the bottom of the two movable support legs 4 to form a "cross" structure, thereby creating a stable bottom support frame.

[0056] Subsequently, the support ring 2 is connected to the upper ends of the corresponding movable support leg 4 and fixed support leg 6 on all four sides, so that the support ring 2 is stably installed at the target height above the connecting rod 1. When connecting or disassembling the adapter, vertical calibration is performed by inserting the adapter into the support ring 2 from above and using the water nozzle fixing rod 3 to form an axis reference for alignment.

[0057] Next, the multiple connector correction screws 77 (preferably four) arranged on the outer periphery of the support ring 2 are adjusted. Through radial fine adjustment, they can adapt to different sizes of conversion connectors, uniformly clamp the conversion connectors, and provide stable and reliable positioning and support for the conversion connectors.

[0058] At this point, connecting or disconnecting the adapter can prevent the adapter from shifting, shaking, or falling during the connection or disconnection process, effectively avoiding damage to the adapter.

[0059] After the conversion joint connection or disassembly is completed, the connection between the movable outrigger 4 and the support ring 2 can be disconnected. The movable outrigger 4 can be folded and rotated to be stored on both sides of the connecting rod 1. At the same time, the support ring 2 can be rotated to be coplanar with the fixed outrigger 6. The overall device is stored from the original three-dimensional structure to a compact planar structure, which effectively reduces the space occupied, facilitates on-site handling and rapid deployment, and is suitable for field well sites and other operating environments, effectively improving the flexibility and response efficiency of on-site operations.

[0060] The connecting rod 1 has two connecting lugs 8 arranged vertically on both sides of the water nozzle fixing rod 3. The connecting lugs 8 have hinge holes, and a positioning pin 9 passes through the hinge holes. The positioning pin 9 passes through the lower end of the movable support leg 4 and is rotatably connected to the movable support leg 4.

[0061] By setting connecting ear plates 8 arranged vertically on both sides of the water nozzle fixing rod 3 on the connecting rod 11, and opening hinge holes on the ear plates, the movable support leg 4 is hinged to the connecting ear plate 8 in conjunction with the positioning pin 9, so that the movable support leg 4 has the function of rotating and unfolding and folding for storage.

[0062] The locking assembly includes a locking pin 10. The movable leg 4 is provided with a positioning hole. The connecting ear plate 8 has a storage insertion hole 11 and an unfolding insertion hole 12 that match the positioning hole on the outside of the hinge hole. The positioning hole can be inserted into the storage insertion hole 11 and the unfolding insertion hole 12 respectively through the locking pin 10 to realize the storage and unfolding of the movable leg 4.

[0063] By providing positioning holes on the movable support leg 4 and corresponding storage and unfolding insertion holes 11 and 12 on the connecting ear plate 8, which are then used in conjunction with the locking pin 10, the movable support leg 4 can be precisely positioned and stably fixed in both folded storage and vertical unfolded states. This structure is simple in design and easy to operate, allowing for quick switching and secure locking of the movable support leg 4 without the need for additional tools, which is beneficial for its use.

[0064] The upper end of the fixed support leg 6 is provided with a second fixed ear plate, and a second fixed bolt is provided through the second fixed ear plate. The support ring 2 is provided with a second fixed seat 15 that is threadedly engaged with the second fixed bolt.

[0065] By setting a second fixing lug on the upper end of the fixed leg 6 and installing a second fixing bolt through the second fixing lug, the second fixing bolt can be threaded into the second fixing seat 15 on the support ring 2, thereby achieving a firm connection between the support ring 2 and the fixed leg 6.

[0066] The upper end of the movable support leg 4 is provided with a first fixed ear plate 1613, and a first fixed bolt 1714 is provided through the first fixed ear plate 1613. The support ring 2 is provided with a first fixed seat 18 that is threadedly engaged with the first fixed bolt 1714.

[0067] By setting a first fixed ear plate 1613 on the upper end of the movable support leg 4 and passing a first fixed bolt 1714 through the first fixed ear plate 1613, the first fixed bolt 1714 can be threadedly engaged with the first fixed seat 18 on the support ring 2, so as to achieve a firm connection between the support ring 2 and the movable support leg 4.

[0068] The aforementioned device can be folded and stored, reducing space occupation and facilitating on-site handling and rapid deployment. It is suitable for working environments such as field well sites, effectively improving the flexibility and response efficiency of on-site operations.

[0069] By providing positioning holes on the movable support leg 4, and providing corresponding storage holes 11 and unfolding holes 12 on the connecting ear plate 88, and engaging with the locking pin 10, the movable support leg 44 can be precisely positioned and stably fixed in both folded storage and vertical unfolding states.

[0070] In this application, the length of the lateral portion of the L-shaped movable support leg 4 is not limited. It can be set as needed, or it can be designed as a telescopic structure to achieve length adjustment.

[0071] In summary, the drilling joint straightening device provided by this utility model embodiment features a horizontally arranged connecting rod and support ring, connected at both ends by fixed legs. A water nozzle fixing rod, coaxial with the support ring, is located at the center of the top surface of the connecting rod. The connecting rod is hinged with a movable leg, which is L-shaped. The bottom of the movable leg is movably connected to the connecting rod, and the top is movably connected to the support ring. By rotating relative to the connecting rod, it can be unfolded or retracted. Multiple correction holes are provided circumferentially on the support ring, and joint correction screws are installed in these holes to straighten the joint within the support ring. This device allows for simultaneous straightening and folding for storage, reducing space occupation. Its simple structure facilitates on-site handling and rapid deployment, making it suitable for field well sites and other operating environments, effectively improving the flexibility and response efficiency of on-site operations.

[0072] The drilling joint straightening device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A drilling joint straightening device, characterized in that, The device includes a horizontally arranged connecting rod and a support ring. The connecting rod has fixed legs at both ends, which are fixedly connected to the corresponding ends of the support ring. A water nozzle fixing rod, coaxial with the support ring, is located at the center of the top surface of the connecting rod. The connecting rod is hinged with a movable leg, which is L-shaped. The bottom of the movable leg is movably connected to the connecting rod, and the top of the movable leg is movably connected to the support ring. The movable leg can be unfolded or retracted by rotating relative to the connecting rod. The support ring has multiple circumferentially arranged correction holes, each containing a connector correction screw for straightening the connector within the support ring.

2. The drilling joint straightening device as described in claim 1, characterized in that, The number of the correction holes is greater than or equal to 3, and the plurality of correction holes are evenly distributed circumferentially on the support ring.

3. The drilling joint straightening device as described in claim 1, characterized in that, It also includes connecting lugs disposed on both sides of the connecting rod and the water nozzle fixing rod. The connecting lugs are provided with hinge holes, and a positioning pin is disposed in the hinge holes. The positioning pin passes through the lower end of the movable leg and is rotatably connected to the movable leg.

4. The drilling joint straightening device as described in claim 3, characterized in that, It also includes an unfolding socket, a storage socket, and a locking component disposed on the connecting ear plate. The locking component is used to lock the movable support leg in the unfolded state by being installed in the unfolding socket, and to lock the support leg in the storage state by being installed in the storage socket.

5. The drilling joint straightening device as described in claim 4, characterized in that, The line connecting the unfolding insertion hole and the hinge hole of the movable support leg is perpendicular to the length direction of the connecting rod, and the line connecting the storage insertion hole and the hinge hole of the movable support leg is parallel to the length direction of the connecting rod.

6. The drilling joint straightening device as described in claim 5, characterized in that, The connecting lugs include an upper connecting lug located on the upper side of the connecting rod and a lower connecting lug located on the lower side of the connecting rod.

7. The drilling joint straightening device as described in claim 1, characterized in that, It also includes a pad block disposed at the bottom of the movable outrigger, the bottom surface of the pad block being flush with the bottom surface of the connecting rod.

8. The drilling joint straightening device as described in claim 7, characterized in that, The number of movable support legs is greater than or equal to 2, and the multiple movable support legs are evenly distributed on opposite sides of the water nozzle fixing rod.

9. The drilling joint straightening device as described in any one of claims 1-8, characterized in that, It also includes a first fixed lug plate disposed on the upper end of the movable leg, and a first fixed seat is provided on the support ring, and the first fixed seat is movably connected to the first fixed lug plate to realize the movable connection with the movable leg.

10. The drilling joint straightening device as described in claim 1, characterized in that, It also includes a second fixing lug plate disposed at the upper end of the fixed leg, and the support ring is provided with a second fixing seat. The fixed leg and the support ring are fixed by bolts connecting the second fixing lug plate and the second fixing seat.

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