Wellhead welding tool and welding method thereof

Abstract

The present invention discloses a wellhead welding tool and a welding method thereof, which relate to the field of welding technology. The tool comprises an arc-shaped positioning plate, an arc groove being provided on the upper surface of the positioning plate, the arc groove being coaxial with the positioning plate; a first slider slidingly engaged with the arc groove, a first lifting device mounted on the first slider, a welding clamp located at the top of the first lifting device, the welding clamp being used to clamp the welded rib plate; and a locking mechanism for locking the first slider to the arc groove. The present invention can solve the problem of low efficiency in the welding of wellhead ring plates on offshore drilling platforms in the prior art, thereby achieving the purpose of improving the welding continuity of multiple rib plates and improving the efficiency of ring plate operations.

Description

Technical Field

[0001] The present 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 riser is hammered into the mud during the initial installation of the jacket. Unlike onshore surface casing, the surface casing in offshore drilling projects is lowered into the riser. For surface drilling operations in offshore oil and gas development, the surface casing is lowered. After lowering the surface casing, the seat ring is positioned on the riser on the jacket platform. The cantilever beam and derrick of the drilling platform are then adjusted to prepare for the next well. Simultaneously, a simple cement head is used on the jacket platform for surface cementing, significantly reducing construction time.

[0003] After the ring plate is in place, several ribs need to be welded underneath to secure the ring plate to the riser. This rib welding process is quite challenging, as the riser is typically not elevated above the jacket platform (typically around 1 meter) and the welding position is located below the ring plate. Prior art offers specialized ring plate welding devices to reduce the difficulty of welding the matching ribs. However, these devices require complete disassembly and repositioning after welding one rib before welding the next, resulting in low efficiency. Furthermore, these prior art ring plate welding devices require observation through a reflector, which can easily lead to misoperation for welders with limited spatial awareness. 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 operations of wellhead ring plates of offshore drilling platforms in the prior art, and achieves the purpose of improving the welding continuity of multiple rib plates and improving the efficiency of ring plate operations.

[0005] The present invention is achieved through the following technical solutions:

[0006] A wellhead welding tool comprises an arc-shaped positioning plate, an arc groove is provided on the upper surface of the positioning plate, and the arc groove is coaxial with the positioning plate; it also comprises a first slider that slides 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.

[0007] In response to the problem of low efficiency in the welding of wellhead ring plates on 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 provides 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 to be welded, and the lifting and lowering of the welding clamp is controlled by the first lifting device, so that the clamped rib can be lifted to a state of abutment with the bottom surface of the ring plate to be welded.

[0008] When this application is used specifically, the positioning plate is transported to the conductor frame 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 placed 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 by 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 welding clamp is clamped with the next rib to be welded, and the above steps are repeated until the welding of all ribs is completed.

[0009] It can be seen that in the process of ring plate welding operation, the present application can realize the positioning and welding of multiple rib plates without changing the position of the tooling. Compared with the existing technology that requires the overall disassembly and re-installation of each rib plate for welding, it is conducive to the realization of continuous welding operation of multiple rib plates, which significantly reduces the difficulty of operation and improves the operation efficiency.

[0010] The radial direction in this application refers to the radial direction of the positioning plate.

[0011] Furthermore, the locking mechanism includes a plurality of threaded through-holes formed on the first slider and locking bolts matching the threaded through-holes; all threaded through-holes are located directly above the circular arc chute. To adjust the position of the first slider, the locking bolts are loosened to allow the first slider to slide freely within the circular arc chute. Once the first slider is adjusted into position, the locking bolts are tightened until they firmly abut the bottom of the circular arc chute, thereby temporarily positioning the first slider and ensuring rib welding at the designated location.

[0012] 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 conductor frame platform. The existing ring plate welding device realizes the coordination and positioning with the grille of the conductor frame 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 conductor frame platforms is different, and since the width of the notch cannot be adjusted, the versatility of the existing positioning method is relatively weak. If the width of the notch is too narrow, it will make installation and positioning difficult; if the width of the notch is too wide, it will cause insufficient stability of the welding device; 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 conductor frame 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 conductor frame platform, and will not interfere with the sliding adjustment of the first slider.

[0013] Those skilled in the art should understand that the outer side wall of the positioning plate refers to the radially outer side wall of the positioning plate.

[0014] Furthermore, the snap assembly includes a C-shaped part fixed to the outer wall of the positioning plate, a second slider radially slidingly engaged in the C-shaped part, a groove opened from the bottom surface of the second slider, a Z-shaped part longitudinally sliding engaged 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 the end of the Z-shaped part located outside the C-shaped part is lower than the bottom surface of the positioning plate.

[0015] In this solution, the C-shaped member is open radially outward, facilitating the radial outward sliding of the second slider, allowing the Z-shaped member to simultaneously slide radially and adjust its position. The Z-shaped member can also slide longitudinally along the groove, ensuring that the bottom of the positioning plate rests stably and flatly on the jacket platform. This solution allows for flexible radial and longitudinal adjustment of the Z-shaped member, preventing interference between the Z-shaped member and the grille, allowing the Z-shaped member to adapt to grilles in different positions.

[0016] When using this solution, place the positioning plate on the conductor frame platform and wrap the positioning plate around the watertight conductor. During this process, if the Z-shaped part interferes with the grille of the conductor frame platform, adjust the longitudinal and radial positions of the Z-shaped part 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 so that the Z shape enters the grille, release the Z-shaped part, and automatically buckle it onto the adjacent grille.

[0017] 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.

[0018] This solution allows for the continuous welding of all ribs by sequentially joining multiple positioning plates around the exterior of the riser. This eliminates the need for repositioning the positioning plates, significantly improving operational efficiency. Once all ribs are welded, the positioning plates can be removed by disassembling them.

[0019] Furthermore, the positioning plate is provided with matching positioning blocks and positioning grooves at both ends along the circumferential direction; the positioning block is provided with a first magnetic body along the circumferential outer end, and the bottom of the positioning groove is provided with a second magnetic body, and the first magnetic body and the second magnetic body are magnetically attracted to each other.

[0020] Two adjacent positioning plates are connected by matching positioning blocks and positioning slots, and a temporary suction connection is achieved via a first magnetic body and a second magnetic body. This temporary connection does not interfere with the sliding of the first slider on the positioning plate and overcomes the drawback of the positioning plate's curved structure that makes it difficult to connect from the side. It is easy to understand that in this solution, for two adjacent positioning plates, the positioning block of one plate is inserted into the corresponding positioning slot of the other plate, and vice versa.

[0021] Furthermore, both sides of the first lifting device along the circumferential direction are fixedly connected to a supporting platform, a second lifting device is installed on the supporting platform, and the top end of the second lifting device is detachably connected to a welding guide assembly.

[0022] During a more in-depth study, the inventors of this case discovered that the ring plate welding device in the prior art requires the use of a reflector to observe the welding position, which can easily lead to misoperation for welders with a weak sense of space. In order to overcome this problem, this solution sets a support platform on opposite sides of the first lifting device for installing a second lifting device. The height of the welding guide assembly is adjusted by the second lifting device, thereby adapting to the use of water-resistant ducts with different reserved heights. The welding guide assembly provides guidance for the welder, allowing the welder to drive the welding gun directly along the guidance of the welding guide assembly without lying on the platform in a supine position, and also avoids the risk of operating the welding gun direction incorrectly due to a weak sense of space.

[0023] 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.

[0024] Furthermore, the welding guide assembly includes a horizontal bar and a vertical bar that are perpendicular to each other, the horizontal bar and the vertical bar form an L-shaped structure, and the vertical bar extends downward from one end of the horizontal bar in the radial direction; the axis of the horizontal bar is in the radial direction, and the axis of the vertical bar is parallel to the lifting direction of the second lifting device; a first inclined surface is provided on the top surface of the horizontal bar, and a second inclined surface is provided on the radially inward side of the vertical 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.

[0025] This solution defines the structure of the horizontal and vertical rods so that, in operation, the horizontal rods are parallel to the underside of the ring plate, and the vertical rods are parallel to the axial direction of the riser. After the ribs are installed and adjusted into position, the height of the welding guide assembly is adjusted using a second lifting mechanism to ensure a gap between the horizontal rods and the underside of the ring plate, and between the vertical rods and the outer wall of the riser. These gaps are aligned with the welding gun tip, allowing it to fit neatly within the gaps. The welder can then stand or squat, holding the welding gun, insert it from one end of the gap, and move it through the two gaps to complete the welding process.

[0026] As can be seen, this solution, through the positioning and guidance of the horizontal and vertical bars, allows workers to work in either a standing or squatting position, providing clear guidance during the welding process and avoiding the risk of incorrect operation due to welders' poor spatial awareness. Furthermore, the second lifting device can flexibly adjust the height of the welding guide assembly to accommodate risers with different reserved heights.

[0027] 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.

[0028] This solution utilizes a keyed connection between the sleeve and the second lifting device, enabling the welding guide assembly to be detachably attached to the top of the second lifting device. Furthermore, the extension piece allows the welding guide assembly to be more closely aligned with the rib surface being welded. This solution allows for replacement of welding guide assemblies of varying lengths or heights, or extension pieces of varying lengths, to ensure closer alignment of the welding guide assembly to the rib surface being welded, depending on actual working conditions.

[0029] The welding method of the wellhead welding tooling in this application includes:

[0030] Step S1: transport the positioning plate to the jacket platform so that the positioning plate covers the outer wall of the watertight jacket;

[0031] Step S2: running the surface casing to the set well depth, and cutting or removing the surface casing at the top seat ring of the riser;

[0032] 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;

[0033] 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 means of a locking mechanism;

[0034] Step S5: Use 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;

[0035] Step S6: welding the current rib;

[0036] Step S7: Release the clamping of the welding clamp on the current rib, and the first lifting device drives the welding clamp downward to reset;

[0037] Step S8: Repeat steps S3 to S7 until all ribs are welded.

[0038] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0039] 1. The present invention provides a wellhead welding tool and a welding method thereof. During the ring plate welding operation, multiple rib plates can be positioned and welded without changing the tool position. Compared with the existing operation method in which each rib plate needs to be completely disassembled and reinstalled, the present invention is conducive to the continuous welding operation of multiple rib plates, significantly reducing the difficulty of the operation and improving the operation efficiency.

[0040] 2. The wellhead welding tool and welding method of the present invention are not limited by the thickness of the jacket platform grid for the installation of the positioning plate. They can adapt to grids of different positions and thicknesses and will not interfere with the sliding adjustment of the rib plate welding position.

[0041] 3. The wellhead welding tooling and welding method of the present invention can sequentially splice a plurality of positioning plates around the outside of the watertight pipe, thereby realizing continuous welding of all ribs through one installation without adjusting the position of the positioning plates, which is more conducive to improving working efficiency.

[0042] 4. The present invention provides a wellhead welding tool and a welding method thereof, which provides 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 the platform in a supine position to work, and also avoids the risk of operating the welding gun direction incorrectly due to weak sense of space. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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:

[0044] Figure 1 It is a schematic diagram of the local structure of a specific embodiment of the present invention;

[0045] Figure 2 This is a top view of the positioning plates after splicing in a specific embodiment of the present invention;

[0046] Figure 3 is a cross-sectional view of a buckle assembly in a specific embodiment of the present invention;

[0047] Figure 4 This is a structural diagram of a welding guide assembly in a specific embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the ring plate structure after welding.

[0049] Markings and corresponding parts names in the accompanying drawings:

[0050] 1-positioning plate, 2-arc slide groove, 3-first slider, 4-first lifting device, 5-welded clamping part, 6-threaded through hole, 7-fastening bolt, 8-snap 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-jacket platform, 21-waterproof conductor, 22-surface casing, 23-ring plate. DETAILED DESCRIPTION

[0051] In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the examples and drawings. The schematic embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. 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, 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 this application.

[0052] Example 1

[0053] like Figure 1 The wellhead welding tool shown is used for wellhead ring plate welding operations on offshore drilling platforms, including an arc-shaped positioning plate 1, an arc groove 2 being provided on the upper surface of the positioning plate 1, and the arc groove 2 being coaxial with the positioning plate 1; it also includes a first slider 3 that slides 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 being used to clamp the welded rib plate; it also includes a locking mechanism for locking the first slider 3 on the arc groove 2.

[0054] 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 is not specifically limited 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.

[0055] 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 chute 2 .

[0056] In this embodiment, Figure 2 As shown, there are two positioning plates 1, each of which is in the shape of a semicircle; 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 mounted on the first slider 3 are hidden.

[0057] Preferably, the structure of the detachable connection between adjacent positioning plates 1 is:

[0058] At both ends of any positioning plate 1 along the circumferential direction, there are respectively provided with 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 corresponding positioning grooves 10 on the other positioning plate 1, and a temporary connection is achieved by magnetic attraction to ensure that the arc chute 2 on each positioning plate 1 is also stably spliced into an annular chute. In this embodiment, the first magnetic body 11 and the second magnetic body 12 are both permanent magnets.

[0059] Preferably, the arc chute 2 is an anti-slip groove, and its cross section can be a convex shape or a dovetail shape.

[0060] Example 2

[0061] A wellhead welding tool, based on embodiment 1, as Figure 1 As shown, a plurality of snap-fit components 8 are provided on the outer side wall of the positioning plate 1 , and the snap-fit components 8 are used to be snapped onto the catheter rack platform.

[0062] The buckle assembly 8 in this embodiment can refer to Figure 3 , including a C-shaped member 801 fixed to 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 the 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.

[0063] Preferably, the elastic member 805 is a tension spring.

[0064] Preferably, the Z-shaped member 804 includes a first plate, a second plate, and a third plate, which are sequentially connected and integrally formed. The first plate and the third plate are parallel to each other, the second plate is perpendicular to the first and third plates, and the second plate is parallel to the inner bottom surface of the groove 803. The top end of the first plate slides within the groove 803, and the third plate is the end of the Z-shaped member 804 located outside the C-shaped member 801. When no external force is applied, the second plate abuts against the inner bottom surface of the groove 803, and the bottom end of the third plate is lower than the bottom surface of the positioning plate 1. When the first plate slides to the top of its travel, the bottom end of the third plate is equal to or higher than the bottom surface of the positioning plate 1.

[0065] Example 3

[0066] 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 to 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 to a welding guide assembly.

[0067] like Figure 1 and Figure 4 As shown, the welding guide assembly includes a transverse bar 15 and a longitudinal bar 16 that are perpendicular to each other. The transverse bar 15 and the longitudinal bar 16 form an L-shaped structure, and the longitudinal bar 16 extends downward from one end of the transverse bar 15 in the radial direction; the axis of the transverse 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 transverse 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.

[0068] Preferably, the top key of the second lifting device 14 is connected to a sleeve 17, and 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.

[0069] 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.

[0070] In a more preferred embodiment, a linear groove is provided on the side wall of the crossbar 15 near the second lifting device 14, and the end of the extension member 18 slides in engagement with the linear groove. A locking assembly is also included for temporarily locking the extension member 18 within the linear groove. The axis of the linear groove is radially aligned with the positioning plate 1. This locking assembly can be implemented using existing sliding locking methods such as bolts, electromagnets, and snaps.

[0071] Example 4

[0072] A method for welding a wellhead ring plate 23 of an offshore drilling platform, using Figures 1 to 4 The welding tool described above is implemented, and the welding method specifically includes the following steps:

[0073] Step S1: transport the positioning plate 1 to the jacket platform 20 so that the positioning plate 1 covers the outer wall of the watertight jacket 21;

[0074] Step S2: lower the surface casing 22 to the set well depth, and cut or remove the surface casing 22 at the top seat ring 23 of the riser 21;

[0075] Step S3: clamp the rib 19 to be welded with the welding clamp 5 so that the inner wall of the rib 19 contacts the outer wall of the watertight pipe 21;

[0076] Step S4: driving the first slider 3 to slide to the position where the rib 19 needs to be welded, and locking the first slider 3 by the locking mechanism;

[0077] Step S5: Use 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;

[0078] Step S6, welding the current rib 19;

[0079] Step S7: Release 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;

[0080] Step S8, repeat steps S3 to S7 until all ribs 19 are welded, and the following is obtained: Figure 5 The structure shown;

[0081] 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.

[0082] 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.

[0083] In a more preferred embodiment, the method of wrapping the positioning plate 1 around the outer wall of the watertight pipe 21 includes:

[0084] Make the positioning plate suspended in the air with its inner wall resting 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 snap 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.

[0085] In a more preferred embodiment, the method of welding the current rib 19 includes:

[0086] 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; after that, the welder adopts a standing or squatting position, holding the welding gun and inserting 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.

[0087] 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.

[0088] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In addition, the term "connected" as used in this document, unless otherwise specified, may refer to a direct connection or an indirect connection via other components.

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) installed on the first slider (3), and a welding clamp (5) located at the top end of the first lifting device (4), and 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); A plurality of snap-fit assemblies (8) are provided on the outer side wall of the positioning plate (1), and the snap-fit assemblies (8) are used to be snapped onto the catheter frame platform; 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 the 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); 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 installed on the support platform (13), and the top end of the second lifting device (14) is detachably connected to a welding guide assembly; The welding guide assembly comprises a transverse rod (15) and a longitudinal rod (16) which are perpendicular to each other, the transverse rod (15) and the longitudinal rod (16) forming an L-shaped structure, and the longitudinal rod (16) extending downward from one end of the transverse rod (15) inward in the radial direction; the axis of the transverse rod (15) is in the radial direction, and the axis of the longitudinal rod (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 transverse rod (15), and a second inclined surface (161) is provided on the radially inward side surface of the longitudinal rod (16); the first inclined surface (151) gradually tilts 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 tilts inward from the side close to the second lifting device (14) to the side away from the second lifting device (14); 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; 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; 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.

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

3. A welding method for a wellhead welding tool according to claim 1 or 2, characterized in that: include: Step S1, transporting the positioning plate (1) to the jacket platform, so that the positioning plate (1) is covered on the outer wall of the watertight jacket; Step S2: running the surface casing to the set well depth, and cutting or removing the surface casing at the top seat ring 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) through 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; Step S7, releasing the clamping of the welding clamp (5) on the current rib, and the first lifting device (4) drives the welding clamp (5) downward to reset; Step S8: Repeat steps S3 to S7 until all ribs are welded.

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