Wellhead welding tool and welding method thereof

Abstract

The invention discloses a wellhead welding tool and a welding method thereof, and relates to the technical field of welding, the wellhead welding tool comprises an arc-shaped positioning plate, an arc sliding groove is formed in the upper surface of the positioning plate, and the arc sliding groove and the positioning plate are coaxial; the first sliding block is arranged on the arc sliding groove in a sliding fit mode, the first lifting device is installed on the first sliding block, the welding clamping piece is located at the top end of the first lifting device, and the welding clamping piece is used for clamping a welded rib plate; the device further comprises a locking mechanism used for locking the first sliding block on the arc sliding groove. The problem that in the prior art, the welding operation efficiency of a wellhead annular plate of an offshore drilling platform is low can be solved, and the purposes of improving the welding continuity of a plurality of rib plates and improving the annular plate operation efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a wellhead welding tool and a welding method thereof. Background Art

[0002] For offshore drilling platforms, the watertight pipe is hammered into the mud when the jacket is erected in the early stage. Therefore, unlike the surface casing on land, the surface casing in offshore drilling projects is lowered into the watertight pipe. For the surface opening operation of offshore oil and gas development, the operation mode is to lower the surface casing, place the seat ring plate on the watertight pipe on the jacket platform, and then adjust the cantilever beam and derrick position of the drilling platform to operate the next well. At the same time, a simple cement head is used on the jacket platform for surface cementing operations, thereby saving a lot of construction time.

[0003] After the ring plate is in place, it is necessary to weld several ribs under the ring plate to fix the ring plate and the watertight pipe through the ribs. Since the reserved height of the watertight pipe on the pipe rack platform is generally not high (usually about 1m), and the welding position is located under the ring plate, it is very difficult to operate. In the prior art, a special ring plate welding device is provided to reduce the difficulty of welding the matching ribs, but after welding a rib plate, it needs to be disassembled and replaced as a whole to realize the welding operation of the next rib plate, which is inefficient; and the ring plate welding device in the prior art needs to be observed through reflection mirrors, which is easy to cause misoperation for welders with poor spatial sense. Summary of the invention

[0004] The present invention provides a wellhead welding tool and a welding method thereof, which at least solves the problem of low efficiency in welding operation of a wellhead ring plate of an offshore drilling platform in the prior art, and achieves the purpose of improving welding continuity of multiple rib plates and improving the operation efficiency of the ring plate.

[0005] The present invention is achieved through the following technical solutions: A wellhead welding tool comprises an arc-shaped positioning plate, an arc groove is arranged on the upper surface of the positioning plate, and the arc groove is coaxial with the positioning plate; it also comprises a first slider slidably fitted on the arc groove, a first lifting device installed on the first slider, and a welding clamp located at the top of the first lifting device, the welding clamp is used to clamp the welded rib plate; it also comprises a locking mechanism for locking the first slider on the arc groove.

[0006] In view of the problem of low efficiency in the welding of wellhead ring plates of offshore drilling platforms in the prior art, the present invention first proposes a wellhead welding tool, which includes an arc-shaped positioning plate, and the arc size of the inner wall of the positioning plate matches the outer diameter of the watertight pipe to be welded, so that the positioning plate can be wrapped around the watertight pipe. The present application sets an arc groove on the upper surface of the positioning plate, and the first slider can slide along the first groove, thereby driving all parts located on the first slider to rotate around the watertight pipe. The welding clamp is used to clamp the rib plate to be welded, and the lifting and lowering of the welding clamp is controlled by the first lifting device, so that the clamped rib plate can be lifted to a state of abutting against the bottom surface of the ring plate to be welded.

[0007] When the present application is used specifically, the positioning plate is transported to the conductor rack platform so that the positioning plate is covered on the outer wall of the watertight conductor; the surface casing is lowered to the set well depth, and the ring plate is installed at the top of the watertight conductor, and the surface casing is cut or removed; the rib to be welded is clamped with a welding clamp so that the inner wall of the rib contacts the outer wall of the watertight conductor; the first slider is driven to slide to the position where the rib needs to be welded, and the first slider is locked by the locking mechanism; the welding clamp is pushed upward with the first lifting device until the top surface of the rib contacts the bottom surface of the ring plate; the current rib is welded; the welding clamp is released from the clamping of the current rib, and the first lifting device drives the welding clamp downward to reset, at this point, the welding of one rib is completed; the next rib to be welded is clamped with the welding clamp, and the above steps are repeated until the welding of all ribs is completed.

[0008] It can be seen that in the process of ring plate welding operation, the present application can realize the positioning and welding of multiple ribs without changing the position of the tooling. Compared with the prior art operation method in which each rib needs to be disassembled as a whole and reinstalled before welding, it is conducive to realizing continuous welding operations of multiple ribs, significantly reducing the difficulty of the operation and improving the operation efficiency.

[0009] The radial direction in this application refers to the radial direction of the positioning plate.

[0010] Furthermore, the locking mechanism includes a plurality of threaded through holes formed on the first slider and fixing bolts matching the threaded through holes; all the threaded through holes are located directly above the arc chute. When the position of the first slider needs to be adjusted, the fixing bolts are loosened to allow the first slider to slide freely in the arc chute; after the first slider is adjusted to the right position, the fixing bolts are tightened to make the fixing bolts firmly contact the bottom of the arc chute, thereby realizing the temporary positioning of the first slider and ensuring the rib welding operation at the designated position.

[0011] Furthermore, the outer wall of the positioning plate is provided with a plurality of snap-on assemblies, and the snap-on assemblies are used to buckle onto the catheter rack platform. The existing ring plate welding device realizes the coordination and positioning with the grille of the catheter rack platform through a limiting plate with a notch. However, the inventor of this case found in the process of in-depth research that the thickness of the grilles used on different catheter rack platforms is different, and since the width of the notch is not adjustable, the versatility of the existing positioning method is weak. If the width of the notch is too narrow, it will make it difficult to install and position; if the width of the notch is too wide, it will cause the welding device to be insufficiently stable; and the limiting plate in the prior art needs to be operated on the top of the positioning plate, which will inevitably interfere with the sliding of the first slider in this application. Based on this, the present solution sets a plurality of snap-on assemblies on the outer wall of the positioning plate, and buckles the snap-on assemblies onto the catheter rack platform to realize the temporary installation and positioning of the positioning plate. This installation method is not limited by the thickness of the grille of the catheter rack platform, and will not interfere with the sliding adjustment of the first slider.

[0012] Those skilled in the art should understand that the outer side wall of the positioning plate refers to the side wall of the positioning plate on the radially outer side.

[0013] Furthermore, the snap assembly includes a C-shaped part fixed to the outer wall of the positioning plate, a second slider radially slidingly fitted in the C-shaped part, a groove opened on the bottom surface of the second slider, a Z-shaped part longitudinally slidingly fitted in the groove, and an elastic part connected between the second slider and the C-shaped part; the open end of the C-shaped part is radially outward, one end of the Z-shaped part is located in the groove, and the other end is located outside the C-shaped part; when the Z-shaped part abuts against the inner bottom surface of the C-shaped part, the height of one end of the Z-shaped part located outside the C-shaped part is lower than the bottom surface of the positioning plate.

[0014] In this solution, the C-shaped piece is open in the radially outward direction, which facilitates the second slider to slide radially outward, so that the Z-shaped piece can slide radially to adjust its position synchronously; the Z-shaped piece can also slide longitudinally along the groove to ensure that the bottom of the positioning plate can be stably and flatly placed on the catheter frame platform. This solution avoids interference between the Z-shaped piece and the grille by flexibly adjusting the Z-shaped piece in the radial and longitudinal directions, so that the Z-shaped piece can adapt to grilles in different positions.

[0015] When this solution is used, the positioning plate is placed on the conductor frame platform and the positioning plate is covered on the outside of the watertight conductor. During this process, if the Z-shaped part interferes with the grille of the conductor frame platform, the longitudinal and radial positions of the Z-shaped part are adjusted to ensure that the positioning plate can be placed flat on the conductor frame platform; determine whether each elastic part is in a stretched state: if so, keep the buckle assembly stationary; if not, lift the Z-shaped part upward so that the bottom end of the Z-shaped part is higher than the surface height of the conductor frame platform, pull the Z-shaped part radially outward, so that the elastic part is in a stretched state, and the end of the Z-shaped part located outside the C-shaped part can be inserted into the grille; push the Z-shaped part downward to allow the Z-shaped part to enter the grille, release the Z-shaped part, and allow it to automatically buckle on the adjacent grille.

[0016] Furthermore, there are a plurality of positioning plates, and the plurality of positioning plates are spliced ​​together to form a circular ring; and adjacent positioning plates are detachably connected.

[0017] When using this solution, multiple positioning plates are sequentially spliced ​​around the outside of the watertight pipe, and then all ribs can be continuously welded through one installation, without adjusting the position of the positioning plates, which is more conducive to improving work efficiency. After all ribs are welded, the positioning plates can be disassembled and taken out.

[0018] Furthermore, the positioning plate is provided with matching positioning blocks and positioning grooves at both ends along the circumferential direction; a first magnetic body is provided at the outer end of the positioning block along the circumferential direction, and a second magnetic body is provided at the bottom of the positioning groove, and the first magnetic body and the second magnetic body are magnetically attracted to each other.

[0019] Between two adjacent positioning plates, matching positioning blocks and positioning grooves are connected, and a temporary adsorption connection is achieved through the first magnetic body and the second magnetic body. This temporary connection method will not interfere with the sliding of the first slider on the positioning plate, and also overcomes the defect that the arc structure of the positioning plate is not convenient for connection from the side. It is not difficult to understand that in this solution, for two adjacent positioning plates, the positioning block of one is inserted into the corresponding positioning groove of the other, and vice versa.

[0020] Furthermore, both sides of the first lifting device along the circumferential direction are fixedly connected with a support, and the second lifting device is installed on the support. The top end of the second lifting device is detachably connected with a welding guide assembly.

[0021] During a more in-depth study, the inventor of this case discovered that the ring plate welding device in the prior art needs to observe the welding position through reflection by a reflector, which is prone to misoperation for welders with weak spatial sense. In order to overcome this problem, this solution sets a support platform on the opposite sides of the first lifting device for installing the second lifting device. The height of the welding guide assembly is adjusted by the second lifting device, so as to adapt to the use of water-blocking ducts with different reserved heights. The welding guide assembly provides guidance for the welder, so that the welder can directly drive the welding gun along the guidance of the welding guide assembly, without lying on the platform to work in a supine position, and avoids the risk of operating the welding gun in the wrong direction due to weak spatial sense.

[0022] Of course, the installation position of the support platform in this solution must not interfere with the normal lifting of the first lifting device within the travel range.

[0023] Furthermore, the welding guide assembly includes a cross bar and a longitudinal bar which are perpendicular to each other, the cross bar and the longitudinal bar form an L-shaped structure, and the longitudinal bar extends downward from one end of the cross bar which is radially inward; the axis of the cross bar is along the radial direction, and the axis of the longitudinal bar is parallel to the lifting direction of the second lifting device; a first inclined surface is provided on the top surface of the cross bar, and a second inclined surface is provided on the radially inward side of the longitudinal bar, the first inclined surface gradually inclines upward from the side close to the second lifting device to the side away from the second lifting device, and the second inclined surface gradually inclines inward from the side close to the second lifting device to the side away from the second lifting device.

[0024] This solution defines the structure of the crossbar and the longitudinal bar so that in the working state, the crossbar is parallel to the bottom surface of the ring plate, and the longitudinal bar is parallel to the axial direction of the watertight pipe. After the ribs are installed and adjusted in place, the height of the welding guide assembly is adjusted by the second lifting device so that there is a gap between the crossbar and the bottom surface of the ring plate, and there is a gap between the longitudinal bar and the outer wall of the watertight pipe, and the aforementioned gaps are matched with the welding gun head used, so that the gun head can just enter the aforementioned gaps. After that, the welder can stand or squat, hold the welding gun and insert it from one end of a gap, move in the aforementioned two gaps in turn and complete the welding.

[0025] It can be seen that this solution enables workers to work in a standing or squatting position through the positioning and guidance of the horizontal and vertical bars, and provides clear guidance for the welding process, avoiding the risk of incorrect operation due to the welder's weak sense of space. In addition, the second lifting device can flexibly adjust the height of the welding guide assembly to adapt to the use of water-tight pipes with different reserved heights.

[0026] Furthermore, the top key of the second lifting device is connected to a sleeve, an extension piece is fixedly connected to the sleeve, and the extension piece is connected to the welding guide assembly.

[0027] In this solution, the sleeve is connected to the key of the second lifting device to achieve a detachable connection of the welding guide assembly at the top of the second lifting device; in addition, the extension piece can make the welding guide assembly closer to the surface of the rib plate to be welded. In this solution, welding guide assemblies of different lengths or heights can be replaced according to actual working conditions, or extension pieces of different lengths can be replaced to ensure that the welding guide assembly is closer to the surface of the rib plate to be welded.

[0028] The welding method based on the wellhead welding tool in this application includes: Step S1, transporting the positioning plate to the conductor rack platform so that the positioning plate is covered on the outer wall of the watertight conductor; Step S2, lowering the surface casing to the set well depth, and cutting or removing the surface casing at the top seat ring plate of the riser; Step S3, clamping the rib to be welded with a welding clamp so that the inner wall of the rib contacts the outer wall of the watertight pipe; Step S4, driving the first slider to slide to the position where the rib plate needs to be welded, and locking the first slider by a locking mechanism; Step S5, using the first lifting device to push the welding clamp upward until the top surface of the rib plate contacts the bottom surface of the ring plate; Step S6, welding the current rib plate; Step S7, releasing the clamping of the welding clamping member on the current rib plate, and the first lifting device drives the welding clamping member to descend and reset; Step S8, repeat steps S3 to S7 until the welding of all ribs is completed.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention provides a wellhead welding tool and a welding method thereof. During the ring plate welding operation, multiple ribs can be positioned and welded without changing the tool position. Compared with the prior art operation method in which each rib needs to be disassembled as a whole and reinstalled, the tool is conducive to continuous welding of multiple ribs, significantly reducing the difficulty of the operation and improving the operation efficiency.

[0030] 2. The wellhead welding tool and welding method of the present invention are not limited by the thickness of the grille of the conductor frame platform, and can adapt to grilles of different positions and thicknesses, and will not interfere with the sliding adjustment of the rib plate welding position.

[0031] 3. A wellhead welding tool and a welding method thereof of the present invention can sequentially splice a plurality of positioning plates around the outside of the watertight pipe, and then realize continuous welding of all ribs through one installation, without the need to adjust the position of the positioning plates, which is more conducive to improving work efficiency.

[0032] 4. A wellhead welding tool and a welding method thereof of the present invention provide guidance for the welder through a welding guide assembly, so that the welder can directly move the welding gun along the guidance of the welding guide assembly without lying on a platform to work in a supine position, and also avoids the risk of operating the welding gun in the wrong direction due to a weak sense of space. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 It is a schematic diagram of a local structure of a specific embodiment of the present invention; Figure 2 It is a top view of the positioning plates after being spliced ​​in a specific embodiment of the present invention; Figure 3 It is a cross-sectional view of a buckle assembly in a specific embodiment of the present invention; Figure 4 It is a structural schematic diagram of a welding guide assembly in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the ring plate structure after welding. Marks and corresponding parts names in the attached drawings: 1-positioning plate, 2-arc slide groove, 3-first slider, 4-first lifting device, 5-welded clamp, 6-threaded through hole, 7-fastening bolt, 8-buckle assembly, 801-C-type part, 802-second slider, 803-groove, 804-Z-type part, 805-elastic part, 9-positioning block, 10-positioning groove, 11-first magnetic body, 12-second magnetic body, 13-support platform, 14-second lifting device, 15-cross bar, 151-first inclined plane, 16-longitudinal bar, 161-second inclined plane, 17-sleeve, 18-extension part, 19-rib plate, 20-catheter frame platform, 21-waterproof catheter, 22-surface casing, 23-ring plate. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples and the accompanying drawings. The schematic embodiments of the present invention and the description thereof are only used to explain the present invention and are not intended to limit the present invention. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the scope of protection of the present application.

[0035] Example 1

[0036] like Figure 1 A wellhead welding tool shown is used for wellhead ring plate welding operations of offshore drilling platforms, including an arc-shaped positioning plate 1, an arc groove 2 is arranged on the upper surface of the positioning plate 1, and the arc groove 2 is coaxial with the positioning plate 1; it also includes a first slider 3 that is slidably fitted on the arc groove 2, a first lifting device 4 installed on the first slider 3, and a welding clamp 5 located at the top of the first lifting device 4, the welding clamp 5 is used to clamp the welded rib plate; it also includes a locking mechanism for locking the first slider 3 on the arc groove 2.

[0037] The welding clamp 5 in this embodiment can be implemented by any clamp in the prior art that can clamp the rib to be welded, and no specific limitation is made here. The first lifting device 4 in this embodiment can be implemented by any existing lifting device, such as an electric, pneumatic or manually adjustable lifting rod.

[0038] The locking mechanism includes a plurality of threaded through holes 6 formed on the first sliding block 3 and fixing bolts 7 matching the threaded through holes 6 ; all the threaded through holes 6 are located directly above the circular arc sliding groove 2 .

[0039] In this embodiment, Figure 2 As shown, there are two positioning plates 1, each of which is in a semicircular arc shape; the two positioning plates 1 can be spliced ​​together to form a circular ring; and the two positioning plates 1 can be detachably connected. Figure 2 For the convenience of illustration, all components installed on the first sliding block 3 are hidden.

[0040] Preferably, the structure of the detachable connection between adjacent positioning plates 1 is: At both ends of any positioning plate 1 along the circumferential direction, there are respectively provided mutually matching positioning blocks 9 and positioning grooves 10; the positioning block 9 is provided with a first magnetic body 11 along the circumferential outer end, and the bottom of the positioning groove 10 is provided with a second magnetic body 12, and the first magnetic body 11 and the second magnetic body 12 are magnetically attracted to each other. When splicing, the positioning blocks 9 on each of the two positioning plates 1 are respectively placed in the positioning grooves 10 opposite thereto on the other positioning plate 1, and a temporary connection is achieved by magnetic attraction to ensure that the arc grooves 2 on each positioning plate 1 are also stably spliced ​​into an annular groove. In this embodiment, the first magnetic body 11 and the second magnetic body 12 are both permanent magnets.

[0041] Preferably, the arc sliding groove 2 is an anti-slip groove, and its cross-section can be a convex shape or a dovetail shape.

[0042] Example 2

[0043] A wellhead welding tool, based on embodiment 1, as Figure 1 As shown, a plurality of buckle assemblies 8 are provided on the outer side wall of the positioning plate 1, and the buckle assemblies 8 are used to buckle on the catheter rack platform.

[0044] The buckle assembly 8 in this embodiment can refer to Figure 3 , including a C-shaped member 801 fixed on the outer wall of the positioning plate 1, a second slider 802 radially slidingly fitted in the C-shaped member 801, a groove 803 opened on the bottom surface of the second slider 802, a Z-shaped member 804 longitudinally slidingly fitted in the groove 803, and an elastic member 805 connected between the second slider 802 and the C-shaped member 801; the open end of the C-shaped member 801 is radially outward, one end of the Z-shaped member 804 is located in the groove 803, and the other end is located outside the C-shaped member 801; when the Z-shaped member 804 abuts against the inner bottom surface of the C-shaped member 801, the height of one end of the Z-shaped member 804 located outside the C-shaped member 801 is lower than the bottom surface of the positioning plate 1.

[0045] Preferably, the elastic member 805 is a tension spring.

[0046] Preferably, the Z-shaped member 804 includes a first plate, a second plate and a third plate which are connected in sequence and formed integrally; wherein the first plate and the third plate are parallel to each other, the second plate is perpendicular to the first plate and the third plate, and the second plate is parallel to the inner bottom surface of the groove 803; the top end of the first plate is slidably fitted in the groove 803, and the third plate is an end of the Z-shaped member 804 located outside the C-shaped member 801. When there is no external force, the second plate is against the inner bottom surface of the groove 803, and the bottom end height of the third plate is lower than the bottom surface height of the positioning plate 1; when the first plate slides to the top of the stroke, the bottom end height of the third plate is equal to or higher than the bottom surface height of the positioning plate 1.

[0047] Example 3

[0048] A wellhead welding tool, based on embodiment 1 or 2, as Figure 1 As shown, both sides of the first lifting device 4 along the circumferential direction are fixedly connected with a support 13, and a second lifting device 14 is installed on the support 13. The top end of the second lifting device 14 is detachably connected with a welding guide assembly.

[0049] like Figure 1 and Figure 4As shown, the welding guide assembly includes a cross bar 15 and a longitudinal bar 16 which are perpendicular to each other, the cross bar 15 and the longitudinal bar 16 form an L-shaped structure, and the longitudinal bar 16 extends downward from one end of the cross bar 15 inward in the radial direction; the axis of the cross bar 15 is in the radial direction, and the axis of the longitudinal bar 16 is parallel to the lifting direction of the second lifting device 14; a first inclined surface 151 is provided on the top surface of the cross bar 15, and a second inclined surface 161 is provided on the radially inward side of the longitudinal bar 16, the first inclined surface 151 gradually inclines upward from the side close to the second lifting device 14 to the side away from the second lifting device 14, and the second inclined surface 161 gradually inclines inward from the side close to the second lifting device 14 to the side away from the second lifting device 14.

[0050] Preferably, the top end of the second lifting device 14 is keyed to a sleeve 17, an extension piece 18 is fixedly connected to the sleeve 17, and the extension piece 18 is connected to the cross bar 15 in the welding guide assembly.

[0051] In this embodiment, the second lifting device 14 can be implemented by any existing lifting device, such as an electric, pneumatic or manually adjustable lifting rod.

[0052] In a more preferred embodiment, a linear slide groove is provided on the side wall of the cross bar 15 close to the direction where the second lifting device 14 is located, and the end of the extension member 18 is slidably matched with the linear slide groove; a locking component for temporarily locking the extension member 18 in the linear slide groove is also included; the axis of the linear slide groove is along the radial direction of the positioning plate 1. The locking component can be implemented by existing sliding locking methods such as bolts, electromagnets, and buckles.

[0053] Example 4

[0054] A method for welding a wellhead ring plate 23 of an offshore drilling platform, using Figures 1 to 4 The welding tool described is implemented, and the welding method specifically includes the following steps: Step S1, transporting the positioning plate 1 to the conductor frame platform 20, so that the positioning plate 1 is covered on the outer wall of the watertight conductor 21; Step S2, lowering the surface casing 22 to a set well depth, and cutting or removing the surface casing 22 at the top seat ring plate 23 of the water-proof conductor 21; Step S3, clamping the rib plate 19 to be welded with the welding clamp 5, so that the inner wall of the rib plate 19 contacts the outer wall of the watertight pipe 21; Step S4, driving the first slider 3 to slide to the position where the rib plate 19 needs to be welded, and locking the first slider 3 by means of a locking mechanism; Step S5, using the first lifting device 4 to push the welding clamp 5 upward until the top surface of the rib plate 19 contacts the bottom surface of the ring plate 23; Step S6, welding the current rib 19; Step S7, releasing the clamping of the welding clamp 5 on the current rib 19, and the first lifting device 4 drives the welding clamp 5 downward to reset; Step S8, repeat steps S3 to S7 until all ribs 19 are welded, and the following is obtained: Figure 5 The structure shown; Step S9: Finally, the casing coupling of the surface casing 22 located above the ring plate 23 can be lowered onto the ring plate 23.

[0055] In this embodiment, after the welding of all ribs 19 is completed, the weld conditions can be manually checked to check for leaks and fill in gaps.

[0056] In a more preferred embodiment, the method of wrapping the positioning plate 1 on the outer wall of the watertight pipe 21 includes: Make the positioning plate suspended in the air with its inner wall against the outer wall of the watertight conductor 21, and move the positioning plate downward to the surface of the conductor frame platform 20. During the downward movement of the positioning plate, if a Z-shaped part interferes with the grille of the conductor frame platform 20, adjust the longitudinal and radial positions of the Z-shaped part to avoid the corresponding grille, so that the positioning plate is placed flat on the conductor frame platform 20; determine whether each elastic part is in a stretched state: if so, keep the corresponding buckle assembly stationary; if not, lift the corresponding Z-shaped part upward so that the bottom end of the Z-shaped part is higher than the surface height of the conductor frame platform 20, and pull the Z-shaped part radially outward so that the elastic part is in a stretched state and the end of the Z-shaped part located outside the C-shaped part can be inserted into the grille; push the Z-shaped part downward so that the Z shape enters the grille, and release the Z-shaped part so that it automatically buckles on the adjacent grille and has a tendency to shrink radially inward.

[0057] In a more preferred embodiment, the method of welding the current rib plate 19 includes: The height of the welding guide assembly is adjusted by the second lifting device so that there is a gap between the cross bar and the bottom surface of the ring plate 23 and it is defined as the first gap, and there is a gap between the longitudinal bar and the outer wall of the water-blocking duct 21 and it is defined as the second gap; the widths of the first gap and the second gap are equal to or slightly larger than the size of the welding gun tip used, so that the gun tip can just enter the aforementioned gap; thereafter, the welder adopts a standing or squatting position, holds the welding gun and inserts it from the radially outward end of the first gap, starts the welding gun, moves along the first gap and enters the second gap, and finally leaves from the bottom end of the second gap.

[0058] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the term "connected" used in this article can be directly connected or indirectly connected via other components without special explanation.

Claims

1. A wellhead welding tool, comprising an arc-shaped positioning plate (1), characterized in that: The upper surface of the positioning plate (1) is provided with an arc groove (2), and the arc groove (2) is coaxial with the positioning plate (1); it also includes a first slider (3) slidably engaged with the arc groove (2), a first lifting device (4) mounted on the first slider (3), and a welding clamp (5) located at the top end of the first lifting device (4), the welding clamp (5) being used to clamp the rib to be welded; and it also includes a locking mechanism for locking the first slider (3) on the arc groove (2).

2. A wellhead welding tool according to claim 1, characterized in that: The locking mechanism comprises a plurality of threaded through holes (6) formed on the first sliding block (3) and fixing bolts (7) matching the threaded through holes (6); all the threaded through holes (6) are located directly above the circular arc sliding groove (2).

3. A wellhead welding tool according to claim 1, characterized in that: A plurality of buckle assemblies (8) are provided on the outer side wall of the positioning plate (1), and the buckle assemblies (8) are used to buckle onto the catheter frame platform.

4. A wellhead welding tool according to claim 3, characterized in that: The buckle assembly (8) comprises a C-shaped member (801) fixed to the outer wall of the positioning plate (1), a second slider (802) radially slidingly engaged in the C-shaped member (801), a groove (803) formed on the bottom surface of the second slider (802), a Z-shaped member (804) longitudinally slidingly engaged in the groove (803), and an elastic member (805) connected between the second slider (802) and the C-shaped member (801); the open end of the C-shaped member (801) faces radially outward, one end of the Z-shaped member (804) is located in the groove (803), and the other end is located outside the C-shaped member (801); when the Z-shaped member (804) abuts against the inner bottom surface of the C-shaped member (801), the height of one end of the Z-shaped member (804) located outside the C-shaped member (801) is lower than the bottom surface of the positioning plate (1).

5. A wellhead welding tool according to claim 1, characterized in that: There are a plurality of positioning plates (1), and the plurality of positioning plates (1) are spliced ​​together to form a circular ring; adjacent positioning plates (1) are detachably connected.

6. A wellhead welding tool according to claim 5, characterized in that: The positioning plate (1) is provided with mutually matching positioning blocks (9) and positioning grooves (10) at both ends along the circumferential direction; a first magnetic body (11) is provided at the outer end of the positioning block (9) along the circumferential direction, and a second magnetic body (12) is provided at the bottom of the positioning groove (10); the first magnetic body (11) and the second magnetic body (12) are magnetically attracted to each other.

7. A wellhead welding tool according to claim 1, characterized in that: Both sides of the first lifting device (4) along the circumferential direction are fixedly connected to a support platform (13), a second lifting device (14) is mounted on the support platform (13), and a top end of the second lifting device (14) is detachably connected to a welding guide assembly.

8. A wellhead welding tool according to claim 7, characterized in that: The welding guide assembly comprises a cross bar (15) and a longitudinal bar (16) which are perpendicular to each other, the cross bar (15) and the longitudinal bar (16) forming an L-shaped structure, and the longitudinal bar (16) extending downward from one end of the cross bar (15) which is radially inward; the axis of the cross bar (15) is radially inward, and the axis of the longitudinal bar (16) is parallel to the lifting direction of the second lifting device (14); a first inclined surface (151) is arranged on the top surface of the cross bar (15), and a second inclined surface (161) is arranged on the radially inward side surface of the longitudinal bar (16); the first inclined surface (151) is gradually inclined upward from a side close to the second lifting device (14) to a side away from the second lifting device (14), and the second inclined surface (161) is gradually inclined inward from a side close to the second lifting device (14) to a side away from the second lifting device (14).

9. A wellhead welding tool according to claim 7, characterized in that: The top key of the second lifting device (14) is connected to a sleeve (17), an extension piece (18) is fixedly connected to the sleeve (17), and the extension piece (18) is connected to the welding guide assembly.

10. A welding method for a wellhead welding tool according to any one of claims 1 to 9, characterized in that: include: Step S1, transporting the positioning plate (1) to the conductor frame platform so that the positioning plate (1) is wrapped around the outer wall of the watertight conductor; Step S2, lowering the surface casing to the set well depth, and cutting or removing the surface casing at the top seat ring plate of the riser; Step S3, clamping the rib to be welded with a welding clamp (5) so that the inner wall of the rib contacts the outer wall of the watertight pipe; Step S4, driving the first slider (3) to slide to a position where the rib plate needs to be welded, and locking the first slider (3) by means of a locking mechanism; Step S5, using the first lifting device (4) to push the welding clamp (5) upward until the top surface of the rib plate contacts the bottom surface of the ring plate; Step S6, welding the current rib plate; Step S7, releasing the clamping of the welding clamp (5) on the current rib plate, and the first lifting device (4) drives the welding clamp (5) to move downward and reset; Step S8, repeat steps S3 to S7 until the welding of all ribs is completed.

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