Method of tube assembly welding

Abstract

The embodiment of the present application provides a kind of group pipe welding method, the group pipe includes upper group pipe and lower group pipe, wherein the circumferential surface of each pipe body of upper group pipe is welded with at least two ear plates, each pipe body is connected to form a whole through ear plate, the group pipe welding method comprises: the upper group pipe is hoisted to the lower group pipe above;Confirm the reference surface of the lower end surface of each pipe body in upper group pipe, confirm the pipe body to be adjusted in upper group pipe according to reference surface;Loosen the fastener on the ear plate of pipe body to be adjusted, adjust pipe body to be adjusted along up-down direction, until the lower end surface of each pipe body of the upper group pipe is flush with the reference surface;Level the upper end surface of each pipe body of the lower group pipe;Make each pipe body of the upper group pipe and each pipe body of the lower group pipe align, and each pipe body of the upper group pipe and each pipe body of the lower group pipe are welded.The group pipe welding method of the embodiment of the present application is simple to operate, and can solve the problem that welding end surface is not flush.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a method for welding pipe assembly. Background Technology

[0002] In the chemical industry, deep well operations are frequently involved. Long underground pipe fittings are typically formed by vertically butt-welding short sections of pipe fittings together and then immediately lowering them into the well, creating a welding requirement during in-well hoisting. To ensure the overall straightness and flatness of the welded pipe fittings, precise control of the pipe assembly gaps and relative positions is crucial.

[0003] When multiple pipes are vertically assembled and welded together during hoisting, the potential length differences among the pipes in the upper assembly above the well can make it difficult to align their lower ends, i.e., the upper ends of the weld gaps. As the welded fittings are lowered into the well, their length increases with each subsequent assembly and welding operation. This can lead to uneven stress at the connection points during hoisting, causing uneven deformation under gravity. Consequently, the upper ends of the lower assembly pipes, i.e., the lower ends of the weld gaps, are again difficult to align. This makes gap control during pipe assembly and welding particularly challenging. Summary of the Invention

[0004] In view of this, embodiments of this application aim to provide a method for welding pipes together to solve the problem of uneven weld ends.

[0005] To achieve the above objectives, this application provides a method for welding assembled pipes. The assembled pipes include an upper assembled pipe and a lower assembled pipe. Each pipe body of the upper assembled pipe has at least two lugs welded to its circumferential surface, and the pipe bodies are connected by the lugs to form a whole. The method for welding assembled pipes includes: hoisting the upper assembled pipe above the lower assembled pipe; identifying the reference surface of the lower end face of each pipe body in the upper assembled pipe, and identifying the pipe body to be adjusted in the upper assembled pipe according to the reference surface; loosening the fasteners on the lugs of the pipe body to be adjusted, and adjusting the pipe body to be adjusted in the up-down direction until the lower end face of each pipe body of the upper assembled pipe is flush with the reference surface; leveling the upper end face of each pipe body of the lower assembled pipe; aligning each pipe body of the upper assembled pipe with each pipe body of the lower assembled pipe, and welding each pipe body of the upper assembled pipe with each pipe body of the lower assembled pipe.

[0006] In some implementation schemes, the step of identifying the reference plane of the lower end face of each tube in the upper group tube and identifying the tube to be adjusted in the upper group tube based on the reference plane includes: obtaining the height of the lower end face of each tube in the upper group tube; selecting the lower end face with the lowest height as the reference plane; and identifying the tube whose lower end face is not on the reference plane as the tube to be adjusted.

[0007] In some implementations, the step of loosening the fasteners on the ear plate of the tube to be adjusted and adjusting the tube to be adjusted in the up-down direction until the lower end face of each tube in the upper group is flush with the reference plane includes: loosening the fasteners on the ear plate of the current tube to be adjusted; lowering the current tube to be adjusted until the lower end face of the current tube to be adjusted moves to the reference plane; tightening the fasteners on the ear plate of the current tube to be adjusted, and loosening the fasteners on the ear plate of the next tube to be adjusted.

[0008] In some implementations, the step of leveling the upper end face of each tube body of the lower group of pipes includes: monitoring the levelness of the upper end face of each tube body of the lower group of pipes; determining whether the levelness of the upper end face of each tube body of the lower group of pipes meets the welding requirements; if not, grinding the upper end face of the tube body that does not meet the welding requirements until the welding requirements are met.

[0009] In some implementations, the step of monitoring the levelness of the upper end face of each tube in the lower group includes: selecting the upper end face of any tube in the lower group as a second reference plane; measuring the levelness between the upper end face of the remaining tubes in the lower group and the second reference plane, and obtaining the levelness measurement result.

[0010] In some implementation schemes, the step of determining whether the levelness of the upper end face of each tube in the lower group of pipes meets the welding requirements includes: identifying the tube with the lowest upper end face in the lower group of pipes based on the levelness measurement results; obtaining the height difference between the upper end face of each tube in the lower group of pipes that is not the lowest and the upper end face of the tube with the lowest upper end face based on the levelness measurement results and the tube with the lowest upper end face in the lower group of pipes; comparing the height difference of each tube in the lower group of pipes that is not the lowest with a preset value to determine whether the levelness of the upper end face of each tube in the lower group of pipes that is not the lowest meets the welding requirements.

[0011] In some implementations, before the step of hoisting the upper assembly pipe above the lower assembly pipe, the assembly pipe welding method includes: obtaining a positioning fixture, the positioning fixture including a spacer plate with a plurality of open positioning slots, a pipe clamp, and a plurality of contact blocks; placing each pipe body in the positioning slot through the opening; setting each of the contact blocks at the opening position of each of the positioning slots, and clamping each of the contact blocks to the outer wall of the pipe body with the pipe clamp.

[0012] In some implementations, after the steps of setting each of the contact blocks at the opening position of each positioning groove and clamping each of the contact blocks to the outer wall of the tube body with the pipe clamp, the tube assembly welding method includes: rigidly connecting the ear plates to both ends of the connecting plate with fasteners; welding the ear plates at both ends of the connecting plate to the intervals between the tube bodies of the upper tube assembly.

[0013] In some implementations, after welding the ear plates at both ends of the connecting plate to the intervals between the tubes of the upper assembly, the tube welding method includes: sequentially checking the levelness of the upper and lower end faces of each tube of the upper assembly; determining whether the levelness of the upper and lower end faces of each tube of the upper assembly meets the welding requirements; if not, grinding the tubes that do not meet the welding requirements until the welding requirements are met.

[0014] In some implementations, the fasteners on the ear plate of the tube to be adjusted are loosened, and the tube to be adjusted is adjusted in the up-down direction until the lower end face of each tube of the upper group is flush with the reference surface. The tube welding method includes: loosening the pipe clamp to reduce the pressure applied by the contact block to the outer wall of each tube of the upper group.

[0015] In some embodiments, at least a portion of the contact block protrudes away from the pipe body and extends beyond the pipe clamp; after aligning each pipe body of the upper group pipe with each pipe body of the lower group pipe and welding each pipe body of the upper group pipe with each pipe body of the lower group pipe, the pipe welding method includes: sinking each pipe fitting of the upper group pipe into the well, so that the positioning fixture sinks down with it.

[0016] In the pipe assembly welding method of this application embodiment, at least two lugs are welded to the circumferential surface of each pipe body in the upper assembly. The pipe bodies are connected to form a whole through the lugs. Before welding, the upper assembly is hoisted above the lower assembly, the fasteners on the lugs on the pipe body to be adjusted are loosened, and the pipe body to be adjusted is adjusted vertically until the lower end face of each pipe body in the upper assembly is flush with the reference plane. The upper end face of each pipe body in the lower assembly is leveled, and the pipe bodies of the upper assembly are aligned with the pipe bodies of the lower assembly and welded. By adjusting the fasteners on the lugs, the lower end face of each pipe body in the upper assembly can be precisely and quickly adjusted to be flush, the welding gap can be precisely controlled, the weld quality can be guaranteed, and the vertical assembly welding can be guaranteed to meet the design requirements, laying the foundation for subsequent continuous welding construction. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the upper assembly tube according to an embodiment of this application;

[0019] Figure 3 for Figure 2 The top view of the upper tube group shown;

[0020] Figure 4 for Figure 2 The diagram shows the structure of the ear plate, connecting plate, and fasteners of the upper tube assembly.

[0021] Figure 5 for Figure 2 A schematic diagram of the ear plate structure of the upper tube group shown;

[0022] Figure 6 for Figure 2 The diagram shows the structure of the connecting plate of the upper tube group;

[0023] Figure 7 for Figure 2 The diagram shows the structural schematic of the positioning fixture for the upper tube assembly.

[0024] Explanation of reference numerals in the attached figures

[0025] Upper pipe 10; ear plate 11; fastener 12; connecting plate 13; positioning fixture 14; spacer plate 141; positioning groove 1411; pipe clamp 142; contact block 143. Detailed Implementation

[0026] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific embodiments should be understood as an explanation of the spirit of this application and should not be regarded as an undue limitation on this application.

[0027] This application provides a method for welding pipe assemblies. Please refer to [link / reference]. Figure 2 and Figure 3 The assembly tube includes an upper assembly tube 10 and a lower assembly tube. Each tube body of the upper assembly tube 10 has at least two lugs 11 welded to its circumferential surface, and the tube bodies are connected by the lugs 11 to form a whole. That is, by welding the lugs 11 to the tube bodies, the lugs 11 between adjacent tube bodies are connected, which prevents the tube bodies from moving axially or radially relative to each other.

[0028] Please refer to Figure 1 The tube welding method includes:

[0029] S100 hoists the upper pipe assembly above the lower pipe assembly.

[0030] It should be noted that, during the process of hoisting the upper pipe 10 to the upper pipe located above the lower pipe at the bottom of the wellhead, the upper pipe 10 needs to go through multiple processes such as transportation, flipping, and hoisting. During these processes, the stress on each pipe is uneven, resulting in deviations in the horizontality of the lower end face of each pipe.

[0031] S200 confirms the reference plane of the lower end face of each tube in the upper group of tubes, and confirms the tube to be adjusted in the upper group of tubes based on the reference plane.

[0032] S300 Loosen the fasteners on the ear plate of the tube to be adjusted, and adjust the tube to be adjusted in the up and down direction until the lower end face of each tube in the upper group is flush with the reference surface.

[0033] Understandably, please refer to Figure 4 Fastener 12 is set on ear plate 11 welded on the tube body to be adjusted. The fastener 12 on the ear plate 11 connects the tube bodies to form a whole. If the fastener 12 is loosened, the tube body corresponding to the ear plate 11 where the fastener 12 is located will separate from the other tube bodies and can be adjusted individually in the up and down direction.

[0034] S400 adjusts the upper end face of each tube body of the lower group of tubes.

[0035] S500 aligns each tube body of the upper group pipe with each tube body of the lower group pipe, and welds each tube body of the upper group pipe with each tube body of the lower group pipe.

[0036] It is understandable that the upper pipe group 10 is the pipe group that was above the welding gap before welding, and the lower pipe group is the pipe group that was below the welding gap before welding. After the upper pipe group 10 and the lower pipe group are welded, they sink together into the well. When another pipe group is welded, the other pipe group becomes the upper pipe group, and the original upper pipe group 10 becomes the lower pipe group.

[0037] It is understandable that the number of pipe bodies in the upper group 10 and the lower group 10 is determined according to design requirements. In this embodiment, the number of pipe bodies in both the upper group 10 and the lower group 10 is six.

[0038] It is understandable that step S400 can be adjusted to be performed after step S100.

[0039] In the above embodiments, by adjusting the fasteners 12 on the ear plate 11, the lower end faces of each tube body of the upper assembly tube 10 can be adjusted to be flush with each other, the welding gap can be precisely controlled, the welding quality of the weld can be guaranteed, and the vertical assembly welding can be guaranteed to meet the design requirements, laying the foundation for subsequent continuous welding construction.

[0040] For example, step S200 includes:

[0041] S210 obtains the height of the lower end face of each tube in the upper tube group.

[0042] S220 selects the lowest end face as the reference plane.

[0043] S230 confirms that the tube body whose lower end face is not on the reference plane is the tube body to be adjusted.

[0044] It is understandable that, since the reference plane is the lowest end face of each tube in the upper group of tubes 10, the process of adjusting each tube to the reference plane is a downward adjustment. The same adjustment direction facilitates the adjustment operation; and the adjustment direction is downward, which is in the same direction as the gravity of the tube, which also facilitates the implementation of the adjustment operation.

[0045] It is understandable that there are no restrictions on the method of obtaining the height of the lower end face of each tube. In some embodiments, the height of the lower end face of the tube is quickly obtained by a laser measuring instrument, thereby determining the lower end face with the lowest height.

[0046] For example, step S300 includes:

[0047] S310 Loosen the fasteners on the ear plate of the tube to be adjusted.

[0048] S320 causes the tube to be adjusted to sink until the lower end face of the tube to be adjusted moves to the reference plane.

[0049] S330: Tighten the fasteners on the ear plate of the tube to be adjusted, and loosen the fasteners on the ear plate of the next tube to be adjusted.

[0050] The above steps S310, S320, and S330 are repeated multiple times until the lower end faces of each tube in the upper group are flush.

[0051] It is understandable that in the S300 step described above, each tube to be adjusted is adjusted to the reference plane one by one. While adjusting the current tube to be adjusted, the remaining tubes continue to maintain a unified structure, without any relative displacement in the vertical or horizontal directions. After the current tube to be adjusted is adjusted to the reference plane, the fasteners 12 on the ear plate 11 of the current tube to be adjusted are tightened, so that the height of the current tube to be adjusted remains fixed. This helps to reduce the difficulty of adjustment and facilitates quick and accurate adjustment of the level of each tube.

[0052] It is understandable that there are no restrictions on the method of leveling the upper end face of each tube in the lower group of tubes.

[0053] For example, step S400 includes:

[0054] S410 monitors the levelness of the upper end face of each tube in the lower group of tubes.

[0055] In some embodiments, step S410 includes:

[0056] S411 selects the upper end face of any tube in the lower group as the second reference surface.

[0057] S412 measures the levelness between the upper end face of the remaining tube in the lower group and the second reference plane to obtain the levelness measurement result.

[0058] It is understandable that before the upper and lower tubes are welded, the steps S411 and S412 above are repeated at preset intervals.

[0059] It is understood that there are no limitations on the method of measuring levelness. In some embodiments, a strip level is used to measure the levelness of the upper end face of each pipe in the lower assembly.

[0060] S420 determines whether the levelness of the upper end face of each tube in the lower group of tubes meets the welding requirements.

[0061] In some embodiments, step S420 includes:

[0062] S421 Based on the levelness measurement results, confirm the pipe with the lowest upper end face among the lower group of pipes.

[0063] It is understandable that the levelness measurement result includes the levelness between the upper end face of the remaining tubes in the lower group and the second reference plane. By comparing the levelness measurement result corresponding to the upper end face of the remaining tubes in the lower group, the tube with the lowest upper end face in the lower group can be quickly identified.

[0064] S422 obtains the height difference between the upper end face of each pipe in the lower group that is not at its lowest and the upper end face of the pipe with the lowest upper end face, based on the levelness measurement results and the pipe with the lowest upper end face in the lower group of pipes.

[0065] Understandably, since the levelness measurement result is between a randomly selected tube and the remaining tubes, it is necessary to convert the levelness measurement result of the tube with the lowest upper surface and the randomly selected tube into the height difference between the tube with the lowest upper surface and the tubes with non-lowest upper surfaces.

[0066] S422 compares the height difference of each non-lowest tube on the upper end face of the lower group of tubes with a preset value to determine whether the levelness of the upper end face of each non-lowest tube on the upper end face of the lower group of tubes meets the welding requirements.

[0067] Understandably, the preset value is determined based on the welding requirements. If the difference in level between the upper end face of the lowest tube and the upper end face of other tubes exceeds the preset value, the welding requirements are not met. If the difference in level between the upper end face of the lowest tube and the upper end face of other tubes does not exceed the preset value, the welding requirements are met.

[0068] If S430 is not met, the upper end face of the pipe body that does not meet the welding requirements shall be ground until the welding requirements are met.

[0069] In some embodiments, step S430 includes:

[0070] S431 confirms that the pipe body does not meet the welding requirements.

[0071] S432 determines the adjustment amount for each pipe that does not meet the welding requirements based on the difference in levelness between the pipe body that does not meet the welding requirements and the preset value.

[0072] S433 performs grinding on the upper end face of the pipe body that does not meet the welding requirements until the grinding amount meets the adjustment amount.

[0073] It is understandable that as the length of the welding and downhole pipes increases, the upper surface of the downhole pipes may become uneven due to gravity and uneven stress. By monitoring the levelness of the upper surface of each pipe in the downhole assembly, if the levelness does not meet the requirements, it can be controlled by mechanical grinding to ensure that the levelness of the upper surface of the downhole assembly meets the welding requirements before welding.

[0074] For example, prior to step S100, the tube welding method includes:

[0075] S010 obtains the positioning fixture; please refer to [reference needed]. Figure 7 The positioning fixture 14 includes a spacer 141 with several open positioning grooves 1411, a pipe clamp 142, and several contact blocks 143.

[0076] S020 Place each tube body into the positioning groove through the opening.

[0077] S030 The contact blocks are positioned at the openings of the positioning grooves, and the contact blocks are clamped to the outer wall of the tube body using the pipe clamps.

[0078] Understandably, the positioning fixture 14 ensures that the spacing between the tubes remains relatively stable, facilitating the welding and fixing of the ear plate 11.

[0079] For example, after step S030, the pipe assembly welding method includes:

[0080] S040 rigidly connects the ear plates to both ends of the connecting plate using fasteners.

[0081] S050 welds the ear plates at both ends of the connecting plate to the intervals between the tubes of the upper group of tubes.

[0082] It is understandable that before welding the ear plate 11, the connecting plate 13 is rigidly connected to the ear plate 11 to form a rigid connecting part, which largely avoids the situation where the ear plates 11 cannot be assembled in pairs due to uncontrollable deformation caused by the welding of the ear plate 11.

[0083] Understandably, since the ear plate 11 is rigidly connected to both ends of the connecting plate 13 by the fastener 12, the ear plate 11, the connecting plate 13, and the fastener 12 together constitute a rigid body. The length of this rigid body is fixed. When welding this rigid body to the intervals between the tubes of the upper group of tubes 10, since the intervals between adjacent tubes are also fixed, it is convenient to quickly confirm the welding position of the rigid body on the tube, that is, the welding position of the ear plate 11 in the circumferential direction of the tube.

[0084] Understandably, since the connecting plate 13 may obstruct the welding of the inner side of the ear plate 11 during welding, in some embodiments, the ear plate 11 is initially tack welded to the pipe body, and the connecting plate 13 is removed to perform a secondary welding operation on the ear plate 11. After the secondary welding operation is completed, the connecting plate 13 is then installed back in its original position.

[0085] In some embodiments, the rigid body is positioned at the narrowest interval between adjacent tubes; please refer to the following for details. Figure 3 The extension line of the ear plate 11 in the length direction passes through the central axis of the tube body to ensure the stability and reliability of the welding.

[0086] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 6 The connecting plate 13 has two through holes at both ends, which are spaced apart in the vertical direction. Two through holes are also made on the ear plate 11, through which fasteners 12 are inserted, and the two ear plates 11 are fixed to the through holes at both ends of the connecting plate 13 by the fasteners 12.

[0087] Understandably, to facilitate the vertical adjustment of each tube body in the upper assembly 10, at least one of the through holes in the connecting plate 13 and the ear plate 11 has a vertical dimension larger than the diameter of the portion of the fastener 12 that inserts into the through hole. Here, the fastener 12 can be a bolt or nut. In some embodiments, the through holes in the connecting plate 13 and the ear plate 11 are circular holes, and the diameter of the portion of the fastener 12 that inserts into the through hole is smaller than the diameter of the through hole, thus leaving a gap for vertical adjustment.

[0088] For example, after step S050, the pipe assembly welding method includes:

[0089] S060 sequentially checks the levelness of the upper and lower end faces of each tube in the upper group of tubes.

[0090] S070 determines whether the levelness of the upper and lower end faces of each tube in the upper group meets the welding requirements.

[0091] If S080 is not met, the pipe body that does not meet the welding requirements shall be ground until the welding requirements are met.

[0092] It is understandable that the welding of the ear plate 11 will cause uneven heating of the tube body, resulting in uneven deformation of the upper and lower end faces of the tube body. After welding, the levelness of the upper and lower end faces of each tube body is tested, and tube bodies that do not meet the welding requirements are treated by mechanical grinding to meet the welding requirements.

[0093] It is important to understand that the welding of the ear plates 11 is carried out while all the pipes are in a horizontal position. After welding, a spirit level is used to check the relative levelness of the upper and lower end faces of each pipe fitting.

[0094] For example, prior to step S300, the assembly of pipes includes:

[0095] S240 loosens the pipe clamp, reducing the pressure exerted by the contact block on the outer wall of each pipe in the upper group.

[0096] Understandably, during the process of adjusting the lower end face of the pipe to the reference surface, loosening the pipe clamp 142 reduces the friction between the contact block 143 and the pipe, thereby reducing its resistance to the sinking of the pipe.

[0097] It should be noted that during the process of loosening the pipe clamp 142, the degree of loosening needs to be controlled so that the contact block 143 can continuously apply pressure to the outer wall of the pipe.

[0098] For example, after step S500, the pipe assembly welding method includes: sinking each pipe component of the upper pipe assembly into the well, so that the positioning fixture sinks down with it.

[0099] It should be noted that the contact block 143 protrudes at least partially toward the direction away from the pipe body and extends beyond the pipe clamp 142 to prevent the pipe body, pipe clamp 142 from contacting the well wall during sinking.

[0100] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0101] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for welding pipes together, characterized in that, The assembly tube includes an upper assembly tube and a lower assembly tube. Each tube body in the upper assembly tube has at least two lugs welded to its circumferential surface. The tube bodies are connected via the lugs to form a single unit. The welding method for the assembly tube includes: A positioning fixture is obtained, the positioning fixture including a spacer plate with several open positioning slots, a pipe clamp, and several contact blocks; at least a portion of the contact blocks protrudes in a direction away from the pipe body and extends beyond the pipe clamp; Each tube is placed in the positioning groove through the opening; Each of the contact blocks is positioned at the opening of each of the positioning grooves, and the contact blocks are clamped to the outer wall of the tube using the pipe clamp; The ear plates are rigidly connected to both ends of the connecting plate using fasteners; The ear plates are initially spot-welded to the pipe body. The connecting plate is removed and the ear plates are then welded a second time. After the second welding is completed, the connecting plate is reinstalled in its original position so that the ear plates at both ends of the connecting plate are welded to the intervals between the pipe bodies of the upper group of pipes. The levelness of the upper and lower end faces of each tube in the upper group of tubes was checked sequentially. Determine whether the levelness of the upper and lower end faces of each tube in the upper group of pipes meets the welding requirements; If the requirements are not met, the pipe body that does not meet the welding requirements shall be ground until the welding requirements are met. The upper pipe assembly is hoisted above the lower pipe assembly. Obtain the height of the lower end face of each tube in the upper group of tubes; Select the lowest end face as the reference plane; The tube whose lower end face is not on the reference plane is the tube to be adjusted; Loosen the pipe clamp to reduce the pressure exerted by the contact block on the outer wall of each pipe in the upper group of pipes, and maintain the continuous pressure exerted by the contact block on the outer wall of the pipe, so that the contact block abuts against the pipe body to prevent it from falling freely and allows the pipe body to move up and down under the action of external force. Loosen the fasteners on the ear plate of the tube to be adjusted, and adjust the tube to be adjusted in the up and down direction until the lower end face of each tube in the upper group is flush with the reference plane. Select the upper end face of any tube in the lower group as the second reference plane, measure the levelness between the upper end face of the remaining tubes in the lower group and the second reference plane, and obtain the levelness measurement result. Based on the levelness measurement results, that is, the levelness between the upper end face of the remaining tube in the lower group and the second reference plane, compare the value of the levelness measurement results corresponding to the upper end face of the remaining tube in the lower group to confirm the tube with the lowest upper end face in the lower group. Based on the levelness measurement results and the pipe with the lowest upper end face in the lower group of pipes, the height difference between the upper end face of each pipe with a non-lowest upper end face in the lower group of pipes and the upper end face of the pipe with the lowest upper end face is obtained. Compare the height difference of each non-lowest tube on the upper end face of the lower group of tubes with a preset value to determine whether the levelness of the upper end face of each non-lowest tube on the upper end face of the lower group of tubes meets the welding requirements. If any pipe body does not meet the welding requirements, the upper end face of the pipe body that does not meet the welding requirements shall be ground until the welding requirements are met. Align each tube body of the upper group with each tube body of the lower group, and weld each tube body of the upper group with each tube body of the lower group.

2. The pipe assembly welding method as described in claim 1, characterized in that, The steps of loosening the fasteners on the ear plate of the tube to be adjusted and adjusting the tube to be adjusted in the vertical direction until the lower end face of each tube in the upper group is flush with the reference plane include: Loosen the fasteners on the ear plate of the tube to be adjusted; The tube to be adjusted is lowered until the lower end face of the tube to be adjusted moves to the reference plane. Tighten the fasteners on the ear plate of the tube to be adjusted, and loosen the fasteners on the ear plate of the next tube to be adjusted.

3. The pipe assembly welding method as described in claim 1, characterized in that, At least a portion of the contact block protrudes in a direction away from the pipe body and extends beyond the pipe clamp; After aligning the tubes of the upper assembly with the tubes of the lower assembly and welding the tubes of the upper assembly with the tubes of the lower assembly, the tube welding method includes: The pipe fittings of the upper pipe group are lowered into the well, and the positioning tooling is lowered along with them.

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