Marine riser tensioner and guide wheel mounting method

Abstract

The invention provides a marine riser tensioner and guide wheel installation method. The marine riser tensioner and guide wheel installation method comprises the steps that allowance is added to a base of an installation structure and the structure assembly position; the assembling face of the base is machined, so that the flatness and the surface smoothness are machined to meet the installation requirement; drilling is carried out on the base, and the drilling precision is checked; after the drill floor structure is assembled in a segmented mode, datum lines including a drill floor face datum line, a drill floor bottom plate face datum line and a guide wheel base datum line are drawn with the well center as the datum line; the perpendicularity of the included angle and the datum line meets the requirements by adjusting the allowance; according to the installation and debugging mode, all precision requirements are met, and the technical problem that in the prior art, a marine riser tensioner and guide wheel installation method meeting the precision requirements is lacked is solved.

Description

Technical Field:

[0001] The present invention relates to the field of assembly precision, and particularly to a method for installing a riser tensioner and a guide pulley. Background Art:

[0002] The riser tensioner is a part of the ship drilling equipment. The steel cable passes through the tensioner and the guide pulley and acts on the riser, playing a compensating role during the process of lowering the drilling riser to the seabed. It can buffer the impact of sea waves on the riser and ensure the smooth and stable lowering of the riser. Each drill floor is equipped with 12 tensioners and guide pulleys, which are scattered at appropriate angular positions. To ensure the equal force of the tensioners at each angle on the riser, it is necessary to ensure the installation precision of the tensioner and the guide pulley.

[0003] Therefore, there is an urgent need for a method for installing a riser tensioner and a guide pulley, which helps to solve the technical problem that there is a lack of a method for installing a riser tensioner and a guide pulley that meets the precision requirements in the prior art. Summary of the Invention:

[0004] In one embodiment, the present invention provides a method for installing a riser tensioner and a guide pulley,

[0005] The method for installing the riser tensioner and the guide pulley includes:

[0006] Adding a margin to the base and the structure assembly position of the installation structure;

[0007] Machining the assembly surface of the base to achieve the flatness and surface smoothness to meet the installation requirements;

[0008] Performing a match-drilling on the base and checking the hole opening precision, wherein the base of the riser tensioning wheel is match-drilled after the welding installation of other bases;

[0009] Assembling the base on the segment, and temporarily positioning the base by spot welding according to the coordinates of the installation drawing;

[0010] After the overall assembly of the drill floor structure segment is completed, taking the well center as the reference to mark the reference lines, including the drill floor surface reference line, the drill floor bottom surface reference line, and the guide pulley base reference line;

[0011] Taking the drill floor surface reference line and the drill floor bottom surface reference line as the criteria, rechecking the precision of the buffer drum base below the tensioner, and ensuring that its included angle and perpendicularity to the reference line meet the requirements by adjusting the margin;

[0012] Taking the buffer drum base below as the reference to recheck the upper cylinder base, and adjusting the upper cylinder base to meet the precision requirements;

[0013] After all inspections of the base are completed and found to be error-free, welding is carried out. To prevent welding deformation, profile plates are installed at the empty positions of the base, and double welders are used for symmetric welding of the base. During the welding process, various precision data of the base are monitored in real time, and the welding parameters are adjusted in a timely manner.

[0014] In one embodiment, after all inspections of the base are completed and found to be error-free, welding is carried out. To prevent welding deformation, profile plates are installed at the empty positions of the base, and double welders are used for symmetric welding of the base. During the welding process, various precision data of the base are monitored in real time, and the welding parameters are adjusted in a timely manner. After these steps, the method further includes:

[0015] Stress relief is carried out in a timely manner after welding to further control welding deformation, and the accuracy of the base is rechecked.

[0016] In one embodiment, after stress relief is carried out in a timely manner after welding to further control welding deformation and the accuracy of the base is rechecked, the method further includes:

[0017] The tensioner is hoisted and installed. Before hoisting the equipment, check whether there are any parts on the body that may fall off, and select hoisting tools and materials according to the quantity and weight of the equipment by tightening or temporarily removing them.

[0018] In one embodiment, the hoisting of the tensioner is divided into two methods: separate hoisting of components and integral hoisting.

[0019] In one embodiment, the tensioner assembly includes: a buffer drum, a fixed pulley, a cylinder, a cylinder bracket, and a stroke measuring device.

[0020] In one embodiment, after the tensioner is hoisted and installed, and before hoisting the equipment, check whether there are any parts on the body that may fall off, and select hoisting tools and materials according to the quantity and weight of the equipment by tightening or temporarily removing them. After these steps, the method further includes:

[0021] During the installation process after hoisting onto the ship, attention needs to be paid to the component numbers to ensure that the correct tensioner components are paired.

[0022] After the step of paying attention to the component numbers during the installation process after hoisting onto the ship to ensure that the correct tensioner components are paired, the method further includes:

[0023] Select a bolted lifting lug for the lifting operation. Adjust the lifting position of the buffer drum in the lifting step diagram. When the bolted lifting lug is facing upwards, hoist it onto the ship, adjust the position of the connection surface between the buffer drum and the base, locate the center of the bolt holes on the base, and connect the buffer drum to the equipment base with bolts.

[0024] In one embodiment, when using a bolted lug for lifting operations, adjust the lifting position of the buffer drum. When the bolted lug faces upward, lift it onto the ship. Adjust the position of the connection surface between the buffer drum and the base, and locate the center of the bolt holes on the base. After connecting the buffer drum to the equipment base with bolts, the method further includes:

[0025] First, connect the rod end and the piston end, lift the equipment, and turn the hydraulic cylinder over. Rotate the hydraulic cylinder to the upright position, change the lifting to the lug at the center of the top of the hydraulic cylinder, and lift it onto the ship in a vertical orientation as a whole.

[0026] In one embodiment, during installation, adjust the fit between the bottom of the cylinder and the bolt connection surface above the buffer drum. When the hydraulic cylinder cooperates with the buffer drum, there are orientation requirements. Align the bolt holes strictly to ensure that the bottom of each cylinder is correctly aligned with the bolt holes above the buffer drum. The bolt connection requires 100% torque. Use channel steel to make a gantry to fix the cylinder to the elevated platform of the drill floor, and then release the hook after completion.

[0027] In one embodiment, before installation, according to the positions of the bolt holes for connecting the cylinder and the bracket, stamp the bolt positions on the base and use a magnetic drill to drill holes. Then lift and install the cylinder bracket between the drilling rig structure and the cylinder, with the side with holes facing upward, connect the bolts, and check the clearance between the bracket and the base. Connect the cylinder bracket to the elevated platform of the drill floor with bolts, and then connect the bracket to the cylinder to complete the installation of the cylinder bracket. Description of the Drawings:

[0028] Figure 1 Schematic flow diagram of a method for installing a riser tensioner and a guide wheel in one embodiment of the present invention;

[0029] Figure 2 Top view schematic diagram of the drill floor in another embodiment of the present invention;

[0030] Figure 3 Typical cross-sectional schematic diagram in another embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the layout of the reference lines on the bottom surface of the drill floor in another embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the reference lines of the guide wheel base in another embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the cylinder positioning baseline in another embodiment of the present invention;

[0034] Figure 7 Schematic diagram of Step 1 of the installation process of the buffer drum lifting and installation in another embodiment of the present invention;

[0035] Figure 8Schematic diagram of step two of the hoisting and installation process of the installation buffer drum in another embodiment of the present invention;

[0036] Figure 9 Schematic diagram of step three of the hoisting and installation process of the installation buffer drum in another embodiment of the present invention;

[0037] Figure 10 Schematic diagram of the process of hoisting the whole vertically onto the ship in another embodiment of the present invention;

[0038] Figure 11 Schematic diagram of the fixed pulley hoisting in another embodiment of the present invention;

[0039] Figure 12 Schematic diagram of the gasket installation in another embodiment of the present invention;

[0040] Figure 13 Schematic diagram of the inclined support installation in another embodiment of the present invention;

[0041] Figure 14 Schematic diagram of the arrangement of the tensioner wooden pads in another embodiment of the present invention;

[0042] Figure 15 Schematic diagram of the overall hoisting of the tensioner in another embodiment of the present invention;

[0043] Figure 16 Schematic diagram of the process of hoisting and installation of the guide wheel in another embodiment of the present invention. Specific implementation method:

[0044] The technical problem to be solved by the present invention is the installation method of the tensioner and the guide wheel on the vertical structure, to solve the problem that machining cannot be carried out after the equipment base is welded, and to ensure the installation accuracy of the tensioner and the guide wheel.

[0045] The present invention is a new design of the riser tensioner and guide wheel structure for marine drilling equipment.

[0046] First, the diagonally connected lines of 12 tensioners intersect at the well center point.

[0047] Second, the assembly surface of the tensioner base is perpendicular to the diagonally connected lines.

[0048] Third, the surface of the base needs to be machined to ensure its flatness and perpendicularity to the diagonally connected lines, which is a difficult point in the installation. The machining timing of this plane determines the difficulty of the installation.

[0049] The equipment assembly surface is horizontal. Usually, after the equipment base is welded, the base plane is machined. The tensioner base is vertically installed on the drill floor structure wall and has requirements for angle and surface accuracy. The guide wheel is installed on the reverse side of the bottom of the drill floor. After installation, the machining construction is very difficult, and the drill floor structure has a large size and is composed of multiple sub-assemblies. The tensioner base is divided into upper and lower parts, which are respectively arranged on the upper and lower sub-assemblies. There are high precision requirements between the two bases. Considering the construction stage and cost reasons, the base is usually installed before the sub-assemblies are joined together. Controlling the accuracy between the two bases is another difficulty in construction.

[0050] The technical problem to be solved by the present invention is the installation method of the tensioner and the guide wheel on the vertical structure, to solve the problem that machining cannot be carried out after the equipment base is welded, and to ensure the installation accuracy of the tensioner and the guide wheel.

[0051] Figure 1 It is a schematic flow chart of a method for installing a riser tensioner and a guide wheel in an embodiment of the present invention; Figure 2 It is a top view schematic diagram of the drill floor in another embodiment of the present invention; Figure 3 It is a typical cross-sectional schematic diagram in another embodiment of the present invention; Figure 4 It is a schematic diagram of the layout of the reference line on the bottom surface of the drill floor in another embodiment of the present invention;

[0052] Figure 5 It is a schematic diagram of the reference line of the guide wheel base in another embodiment of the present invention; Figure 6 It is a schematic diagram of the cylinder positioning baseline in another embodiment of the present invention; Figure 7 It is a schematic diagram of the first step of the installation process of the installation buffer drum hoisting and installation in another embodiment of the present invention; Figure 8 It is a schematic diagram of the second step of the installation process of the installation buffer drum hoisting and installation in another embodiment of the present invention; Figure 9 It is a schematic diagram of the third step of the installation process of the installation buffer drum hoisting and installation in another embodiment of the present invention; Figure 10 It is a schematic flow chart of the process of hoisting the whole vertically onto the ship in another embodiment of the present invention; Figure 11 It is a schematic diagram of the fixed pulley hoisting in another embodiment of the present invention; Figure 12 It is a schematic diagram of the gasket installation in another embodiment of the present invention; Figure 13 It is a schematic diagram of the inclined support installation in another embodiment of the present invention; Figure 14 It is a schematic diagram of the arrangement of the tensioner wooden blocks in another embodiment of the present invention; Figure 15 It is a schematic diagram of the overall lifting of the tensioner in another embodiment of the present invention; Figure 16 It is a schematic flow chart of the process of hoisting and installing the guide wheel in another embodiment of the present invention.

[0053] Such as Figures 1 to 16As shown, in one embodiment, the present invention provides a method for installing a riser tensioner and a guide wheel, the method for installing a riser tensioner and a guide wheel comprising:

[0054] S101, adding margins to the base and the structural assembly position of the mounting structure.

[0055] This step provides a specific step for increasing the margin at the base and structural assembly position of the mounting structure, leaving room for precision adjustment.

[0056] S102, processing the assembly surface of the base to achieve flatness and surface smoothness to meet installation requirements.

[0057] This step provides a specific step of machining the base assembly surface before assembling the equipment base to process the flatness and surface smoothness to meet the installation requirements.

[0058] S103, performing drilling on the base and checking the hole opening accuracy, wherein the base of the watertight pipe tensioning wheel is drilled after the other bases are welded and installed.

[0059] In this step, a drilling method for the base of the equipment is provided. A mold (using tinplate with the same size as the equipment pin, 0.8mm thickness and 10mm thick wood board) is used to print the position of the lower foot bolt hole. After the drilling on the mold is completed, the mold is placed against the equipment to check the hole opening accuracy. After checking that it is correct, the base is pre-drilled in advance according to the mold hole opening position. Among them, the upper base of the tensioner (i.e., the cylinder bracket base) is not pre-drilled. The base has the least bolt holes and has a higher precision requirement relative to the lower base of the tensioner (i.e., the buffer drum base). After all bases are welded, holes are drilled when the equipment is installed, leaving a specific step for adjusting the precision.

[0060] S104, assembling the base on the segment, and temporarily positioning the base by spot welding according to the coordinates of the installation drawing.

[0061] In this step, a specific step is provided for assembling the equipment base on the segment and temporarily positioning the base by spot welding according to the coordinates of the installation drawing.

[0062] S105, after the drilling platform structure is assembled in sections, reference lines are drawn based on the well center, including the drilling platform surface reference line, the drilling platform bottom plate surface reference line, and the guide wheel base reference line.

[0063] This step provides a specific step for marking the drill floor structure sections after the assembly is completed, using the well center as a reference to draw the reference line, including the drill floor surface reference line, the drill floor bottom plate reference line, and the guide wheel base reference line, and making sample punch marks.

[0064] S106. Using the reference lines of the drill floor surface and the drill floor bottom surface as the criteria, recheck the accuracy of the buffer drum base under the tensioner. Ensure that the included angle and the perpendicularity to the reference line meet the requirements by adjusting the allowance.

[0065] S107. Using the lower buffer drum base as the reference, recheck the upper cylinder base and adjust the upper cylinder base to meet the accuracy requirements.

[0066] In addition, using the reference line as the criterion, recheck the positioning accuracy of the guide wheel base, trim the allowance of the base and adjust it to meet the accuracy requirements, and make marks after assembly.

[0067] S108. After all the bases are rechecked and found to be correct, perform welding. To prevent welding deformation, install the code plate profiles at the empty positions of the bases, and use an even number of welders to perform symmetric welding on the bases. During the welding process, monitor the accuracy data of the bases in real time and adjust the welding parameters in a timely manner.

[0068] In this embodiment, a specific implementation method for installing the riser tensioner and the guide wheel is provided.

[0069] In one embodiment, after all the bases are rechecked and found to be correct and then welded, to prevent welding deformation, install the code plate profiles at the empty positions of the bases, and use an even number of welders to perform symmetric welding on the bases. During the welding process, monitor the accuracy data of the bases in real time and adjust the welding parameters. After this step, the method further includes:

[0070] Eliminate the stress in a timely manner after welding to further control the welding deformation, and recheck the accuracy of the bases again.

[0071] In one embodiment, after the step of eliminating the stress in a timely manner after welding to further control the welding deformation and rechecking the accuracy of the bases again, the method further includes:

[0072] Lift and install the tensioner. Before lifting the equipment, check whether there are any parts on the body that may fall off, and select the lifting tools and materials according to the number and weight of the equipment by tightening or temporarily removing them.

[0073] In one embodiment, the tensioner lifting is divided into two methods: component separate lifting and integral lifting.

[0074] In one embodiment, the tensioner components include: buffer drum, fixed pulley, cylinder, cylinder bracket, stroke measuring device.

[0075] After the tensioner components (including fixed pulley, hydraulic cylinder, buffer drum, stroke measuring device) are lifted onto the ship and during the installation process, pay attention to the component numbers to ensure that the same group of tensioner components are correctly matched and avoid installation errors.

[0076] Installation of the buffer drum: For hoisting and installation, select bolted lugs for the hoisting operation. Adjust the hoisting position of the buffer drum according to the following buffer drum hoisting step diagram. When the bolted lugs face upwards, hoist it onto the ship. Adjust the position of the connection surface between the buffer drum and the base, locate the center of the bolt holes on the base, and connect the buffer drum to the equipment base with bolts. The bolt connection requires 100% torque to ensure the fastening requirements of the equipment. After the torque is applied, release the hook.

[0077] Hoisting and installation of the cylinder: First, connect the rod end and the piston end, hoist the equipment, and turn the hydraulic cylinder over. Rotate the hydraulic cylinder to the upright position, change the hoisting to the lug at the center of the top of the hydraulic cylinder, and hoist it onto the ship in an overall vertical orientation. Refer to the following figure. During installation, adjust the fit between the bottom of the cylinder and the bolt connection surface above the buffer drum. When the hydraulic cylinder is fitted with the buffer drum, there are orientation requirements. Align the bolt holes strictly to ensure that the center of each bolt hole at the bottom of the cylinder is correctly aligned with the bolt holes above the buffer drum. The bolt connection requires 100% torque. Use channel steel to make a gantry to fix the cylinder to the elevated platform of the drill floor. After completion, release the hook.

[0078] In one embodiment, for the hoisting and installation of the tensioner, before hoisting the equipment, check if there are any parts on the body that may fall off. After selecting the hoisting tools and materials according to the number and weight of the equipment by means of fastening or temporary removal, the method further includes:

[0079] After hoisting it onto the ship, pay attention to the component numbers during the installation process to ensure that the components of the same set of tensioners are correctly matched.

[0080] After the step of paying attention to the component numbers during the installation process after hoisting it onto the ship to ensure that the components of the same set of tensioners are correctly matched, the method further includes:

[0081] Select bolted lugs for the hoisting operation, adjust the hoisting position of the buffer drum according to the buffer drum hoisting step diagram. When the bolted lugs face upwards, hoist it onto the ship. Adjust the position of the connection surface between the buffer drum and the base, locate the center of the bolt holes on the base, and connect the buffer drum to the equipment base with bolts.

[0082] In one embodiment, after the step of selecting bolted lugs for the hoisting operation, adjusting the hoisting position of the buffer drum according to the buffer drum hoisting step diagram, hoisting it onto the ship when the bolted lugs face upwards, adjusting the position of the connection surface between the buffer drum and the base, locating the center of the bolt holes on the base, and connecting the buffer drum to the equipment base with bolts, the method further includes:

[0083] First, connect the rod end and the piston end, hoist the equipment, and turn the hydraulic cylinder over. Rotate the hydraulic cylinder to the upright position, change the hoisting to the lug at the center of the top of the hydraulic cylinder, and hoist it onto the ship in an overall vertical orientation.

[0084] In one embodiment, during installation, adjust the fit between the bottom of the cylinder and the bolt connection surface above the buffer drum. When the hydraulic cylinder is fitted with the buffer drum, there are orientation requirements. Align the bolt holes strictly to ensure that the bolt holes at the bottom of each cylinder are correctly aligned with those above the buffer drum. For bolt connections, 100% torque needs to be applied. Use channel steel to make a gantry to fix the cylinder to the elevated platform of the drilling rig, and then unhook after completion.

[0085] In one embodiment, before installation, according to the positions of the bolt holes for connecting the cylinder and the bracket, stamp the bolt positions on the base and drill holes using a magnetic drill. Then hoist the cylinder bracket between the drilling rig structure and the cylinder with the hole side of the cylinder bracket facing up, connect the bolts and check the clearance between the bracket and the base. Connect the cylinder bracket to the elevated platform of the drilling rig through bolts, and then connect the bracket to the cylinder to complete the installation of the cylinder bracket. 100% torque needs to be applied to the connecting bolts.

[0086] For the hoisting and installation of the fixed pulley, select a steel wire rope to pass through the fixed pulley, wind it around the pulley once, and hoist it onto the ship. When installing the fixed pulley, place gaskets at the connection between the hydraulic cylinder and the fixed pulley, and connect the top of the hydraulic cylinder and the fixed pulley with bolts, paying attention to the orientation of the fixed pulley.

[0087] After completing the installation of the tensioner equipment, after applying 100% torque to all bolt connections, remove the fixed gantry.

[0088] Integral hoisting and installation of the tensioner

[0089] Integral hoisting can save the working hours of the crane and improve the equipment installation efficiency.

[0090] (1) Horizontal assembly on the ground: First, adjust the placement state of the buffer drum with the connection surface facing downwards, and lay wooden pads below to raise it. Pay attention to the minimum height of the buffer drum. Insert wooden wedges at the positions of the cylinder and the pulley to prevent tilting and sliding; Second, hoist the cylinder and adjust its position. First, connect the cylinder to the buffer drum with bolts, and apply 100% torque to the bolt connection; After the cylinder is connected to the buffer drum, add inclined supports, and the inclined supports need to be spot-welded to the floor jack to prevent the equipment from tipping over, as shown in the figure; Hoist the fixed pulley, adjust the position of the bolt installation foot to align with the bolt holes at the upper part of the cylinder, and install bolts after alignment, applying 100% torque.

[0091] (2) Integral lifting: First, wind the steel cable from the fixed pulley to the buffer drum, wind it tightly, then wind the sling around the fixed pulley and connect it to the lifting tool. The maximum angle between the slings is 60°. Remove the inclined support before the lifting process, gradually adjust the attitude of the tensioner to the vertical during lifting, and then slowly lift the equipment and hoist it onto the ship.

[0092] (3) Fixed Installation on Ship: After the tensioner is hoisted to the vicinity of the base, finely adjust the connection surface between the buffer drum and the base to be parallel to the base. Install the bolts, and use the cylinder bracket to connect the cylinder to the base. Install the bolts and apply 100% torque. At this time, the slings and steel cables on the tensioner can be removed.

[0093] Installation of Stroke Measuring Device: It needs to be installed after the overall installation of the tensioner is completed. The lower bracket is installed on the buffer drum, the upper bracket is installed on the top of the cylinder, and the chain bracket is connected to its fixed pulley. Note: During the installation process, the inner tube on the measuring device should be as close to the bottom as possible.

[0094] Hoisting and Installation of Guide Wheel: First, adjust the position of the guide wheel. Through the four bolt ear holes of the guide wheel seat, install the bolt ears. Adjust the position of the guide wheel from left to right as shown in the following figure. When the wheel body faces downwards, hoist it onto the ship. First, hoist it to the bottom position of the drill floor and place it on the guide wheel bracket; then move it horizontally to directly below the guide wheel base, and adjust the position and orientation of the guide wheel; finally, lift the guide wheel by a hoist to contact the base, and finely adjust to align the bolt holes. Connect the guide wheel to the base with bolts, and after applying 100% torque, detach the guide wheel from the lifting equipment.

[0095] Install the fastening bolts for the equipment. It is required to apply molybdenum disulfide treatment to the bolts, and use a torque wrench to tighten the bolts. The torque value refers to the torque reference table.

[0096] Beneficial Effects:

[0097] 1. The base is machined first and then welded and assembled, reducing the construction difficulty.

[0098] 2. For the two bases with precision requirements, first position one of them, and then use the positioned base as a reference to position the other base to ensure the relative coordinate accuracy of the bases.

[0099] 3. Recheck multiple times to ensure the installation accuracy, at the time of the completion of the structure, during the welding and assembly of the base, before the base is welded, after the base is welded, and before the equipment is installed.

[0100] 4. Control the influence of welding deformation through multiple processes, eliminate welding stress, and improve accuracy.

[0101] The above-described embodiments only represent some embodiments of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A method for installing a riser tensioner and a guide wheel, characterized in that: The method for installing the riser tensioner and guide wheel comprises: Add margins to the base of the mounting structure and the structural assembly location; The assembly surface of the base is processed to achieve flatness and surface smoothness to meet installation requirements; Performing drilling on the base and checking the hole opening accuracy, wherein the base of the riser tensioner is drilled after the other bases are welded and installed; Assemble the base on the segment and temporarily position the base by spot welding according to the coordinates of the installation drawing; After the drilling platform structure is assembled in sections, the datum lines are drawn based on the well center, including the drilling platform surface datum line, the drilling platform bottom plate surface datum line, and the guide wheel base datum line; Based on the datum line of the drilling floor and the datum line of the bottom plate of the drilling floor, check the accuracy of the buffer drum base under the tensioner, and ensure that its angle and verticality with the datum line meet the requirements by adjusting the allowance; Use the lower buffer drum base as a reference to check the upper cylinder base, and adjust the upper cylinder base to meet the accuracy requirements; After all the bases have been checked and verified, welding is carried out. To prevent welding deformation, code plate profiles are installed in the empty position of the base, and the base welding is performed symmetrically by an even number of welders. During the welding process, various accuracy data of the base are monitored in real time, and welding parameters are adjusted in time.

2. The method for installing a riser tensioner and a guide wheel according to claim 1, characterized in that: After all the bases are checked and verified, welding is performed. To prevent welding deformation, a code plate profile is installed at the neutral position of the base, and the base welding is performed symmetrically by an even number of welders. The various precision data of the base are monitored in real time during the welding process, and the welding parameters are adjusted in time. The method also includes: After welding, stress should be eliminated in time to further control welding deformation and recheck the base accuracy.

3. The method for installing a riser tensioner and a guide wheel according to claim 2, characterized in that: After the step of timely eliminating stress after welding, further controlling welding deformation, and rechecking the base accuracy, the method further includes: Before hoisting the tensioner, check whether there are any parts on the main body that may fall off, and select hoisting tools and materials according to the number and weight of the equipment by tightening or temporarily removing them.

4. The method for installing a riser tensioner and a guide wheel according to claim 3, characterized in that: There are two ways to hoist the tensioner: hoisting the components separately and hoisting the entire device.

5. The method for installing a riser tensioner and a guide wheel according to claim 4, characterized in that: The tensioner assembly comprises: a buffer drum, a fixed pulley, a cylinder, a cylinder bracket, and a stroke measuring device.

6. The method for installing a riser tensioner and a guide wheel according to claim 5, characterized in that: The tensioner is hoisted and installed. Before the equipment is hoisted, check whether there are parts on the body that may fall off, and select hoisting tools and materials according to the number and weight of the equipment by tightening or temporarily removing them. The method also includes: After hoisting onto the ship, it is necessary to pay attention to the component numbers during installation to ensure that the same set of tensioner components are matched correctly.

7. The method for installing a riser tensioner and a guide wheel according to claim 6, characterized in that: After the assembly is hoisted onto the ship, the assembly number needs to be noted during the installation process to ensure that the same set of tensioner assemblies are matched with the correct steps. The method further includes: Use bolt lifting lugs for lifting operations. Adjust the buffer drum lifting position. When the bolt lifting lug is facing upward, lift it onto the ship. Adjust the position of the connecting surface between the buffer drum and the base. Locate the center of the bolt hole on the base. Connect the buffer drum to the equipment base with bolts.

8. The method for installing a riser tensioner and a guide wheel according to claim 7, characterized in that: The method further comprises the following steps: selecting the bolt lifting lug for lifting operation, adjusting the lifting position of the buffer drum, lifting the buffer drum onto the ship when the bolt lifting lug is facing upward, adjusting the position of the connection surface between the buffer drum and the base, locating the center of the bolt hole on the base, and connecting the buffer drum to the equipment base through bolts. First connect the rod end and the piston end, lift the equipment, and turn the hydraulic cylinder over. Rotate the hydraulic cylinder to an upright position, change the lifting lug to the center of the top of the hydraulic cylinder, and lift the whole unit onto the ship in a vertical orientation.

9. The method for installing a riser tensioner and a guide wheel according to claim 8, characterized in that: During installation, adjust the bottom of the cylinder and the bolt connection surface above the buffer drum. The hydraulic cylinder has orientation requirements when it cooperates with the buffer drum. Strictly align the bolt holes to ensure that the bottom of each cylinder and the bolt holes above the buffer drum are correctly aligned. The bolt connection requires 100% torque. Use channel steel to make a gantry to fix the cylinder to the drilling platform, and loosen the hook after completion.

10. The method for installing a riser tensioner and a guide wheel according to claim 9, characterized in that: Before installation, according to the position of the bolt holes connecting the cylinder and the bracket, print the bolt positions on the base and use a magnetic drill to drill holes. Then hoist the cylinder bracket between the drilling rig structure and the cylinder, with the hole side of the cylinder bracket facing up, connect the bolts and check the gap between the bracket and the base. Connect the cylinder bracket to the drilling platform via bolts, and then connect the bracket to the cylinder to complete the installation of the cylinder bracket.

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