Series sleeve structure for pipeline buckling and wrinkle defect repair and graded repair method

Abstract

The invention relates to a series sleeve structure for pipeline buckling wrinkle defect repair and a graded repair method. The series sleeve structure for pipeline buckling wrinkle defect repair comprises two straight pipe section sleeves and a wrinkle defect wrapping elbow sleeve, and the wrinkle defect wrapping elbow sleeve is an elbow sleeve and is used for wrapping a pipeline miter joint part and the outer portion of a pipeline buckling wrinkle. The two straight pipe section sleeves are welded to the two ends of the fold defect wrapping bent pipe sleeve in a circular seam mode respectively and wrap the two end pipe sections of the pipeline in an oblique connection mode and the two end pipe sections of the buckling folds respectively, and the end, away from the fold defect wrapping bent pipe sleeve, of each straight pipe section sleeve is welded to a pipeline circular seam. The method has the advantages that graded repair can be effectively carried out on the buckling wrinkles with different miter angles and protrusion sizes generated in the pipeline buckling process, a large repair cavity is formed, the problems of miter angles and local protrusions existing in the pipeline buckling wrinkles are solved, appropriate standard parts can be selected for combined repair according to the specific sizes of defects, and the repair cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline buckling wrinkle defect repair, and particularly relates to a series sleeve structure for pipeline buckling wrinkle defect repair and a grading repair method. BACKGROUND

[0002] Buckling failure is one of the important failure modes of long-distance oil and gas pipelines, which includes local buckling and overall buckling. Due to the structural characteristics of long-distance oil and gas pipelines, which are thin-walled and long, when the stress condition deteriorates slightly, the stability of the pipeline is easily lost, and then the pipeline may fail in buckling or even rupture. Related research results show that the load causing local buckling failure of the pipeline mainly includes internal pressure, external pressure, bending moment, axial force, etc. The sources of these loads can be divided into two categories. One is the load generated in the normal working state of the pipeline, such as the load generated by internal pressure and external pressure, the load generated by the self-weight of the pipeline and the conveying medium, etc. The other is the load generated by the change of the external environment of the pipeline, such as the load caused by landslides, mudslides, ground subsidence, etc. when the pipeline passes through a region prone to natural disasters, and the load caused by the large difference between the installation temperature and the operating temperature when the pipeline passes through a permafrost region.

[0003] Buckling failure causes the pipeline to have a certain oblique joint angle and local bulging (see Figure 1 ), and the existing repair means are limited.

[0004] In-service welding is an environmentally friendly, economical and efficient oil and gas pipeline repair technology that ensures the continuous and safe operation of the pipeline. B-type sleeve repair technology, as a permanent repair method for oil and gas pipeline defects, does not require shutdown, only requires appropriate pressure reduction and flow limitation, and the repair cost is only 10% of the cost of replacing the pipeline. Therefore, it is widely used in in-service pipeline defect management.

[0005] Buckling failure pipelines have a certain oblique joint angle and local bulging, and the conventional B-type sleeve structure is simple, has a limited sleeve cavity, and has a small assembly gap. It can only be used to repair concentric steel pipes with the same external profile on both sides of the defect, and cannot solve the problem of the oblique joint angle and local bulging of the buckling wrinkle. At present, thick-walled sleeves are generally selected for internal wall boring to manufacture cavities to cover defects, but they cannot cover larger size buckling wrinkles. Some use profiled sleeves for repair, but they need to customize special molds, and the special molds themselves are expensive. In addition, special specification molds cannot cover other specification defects, and the utilization rate is low.

[0006] CN201922050236.7 Steel Pipeline Circumferential Welding Seam Oblique Joint Defect Repair Reinforcing Sleeve proposes to use spliced steel pipes for repair, which can meet the oblique joint problem of the pipeline, but cannot guarantee sufficient repair cavity.

[0007] Therefore, it is necessary to develop a technology capable of effectively repairing the pipe buckling wrinkle defect. SUMMARY

[0008] The technical problem to be solved by the present application is to provide a pipe buckling wrinkle defect repair series sleeve structure and a hierarchical repair method, which effectively overcome the defects of the prior art.

[0009] The technical solution of the present application to solve the above technical problems is as follows:

[0010] A pipe buckling wrinkle defect repair series sleeve structure, comprising two straight pipe section sleeves and a wrinkle defect covering elbow sleeve, the wrinkle defect covering elbow sleeve is an elbow sleeve for covering the pipe bevel joint part and the outside of the pipe buckling wrinkle, the two straight pipe section sleeves are respectively ring seam welded with the two ends of the wrinkle defect covering elbow sleeve, and are respectively covered on the two pipe sections of the pipe bevel joint and the pipe buckling wrinkle, and the end of the straight pipe section sleeve away from the wrinkle defect covering elbow sleeve is ring seam welded with the pipe.

[0011] On the basis of the above technical solution, the present application can also be improved as follows.

[0012] Further, the wrinkle defect covering elbow sleeve comprises two first pipe shells with a semicircular ring shape in longitudinal section, and the two side ends of the two first pipe shells are butt jointed and welded along the edge line.

[0013] Further, the wrinkle defect covering elbow sleeve is a circular arc-shaped elbow sleeve.

[0014] Further, the straight pipe section sleeve is a B-type standard sleeve.

[0015] Further, the buckling angle of the pipe is α, the α≤10°, the protrusion height and the axial length of the pipe buckling wrinkle are not greater than 1 / 10 of the outer diameter of the pipe; the length of the center line of the wrinkle defect covering elbow sleeve is greater than the length of the pipe buckling wrinkle, and the difference between them is not less than 100 mm; the outer diameter of the pipe port at both ends of the wrinkle defect covering elbow sleeve is not less than the outer diameter of the pipe, and the difference between them is 0-6 mm; the central angle of the wrinkle defect covering elbow sleeve is β, and the β=α±3°.

[0016] Further, the straight pipe section sleeve is a conical frustum-shaped reducing sleeve, the conical bottom end of the straight pipe section sleeve is welded with the corresponding end pipe port of the wrinkle defect covering elbow sleeve, and the conical tip end of the straight pipe section sleeve is welded with the surface of the pipe.

[0017] Further, the bending angle of the pipe is a', a>10°, the protruding height and axial length of the bending wrinkle of the pipe are greater than 1 / 10 of the outer diameter of the pipe; the length of the wrinkle defect covering the center line of the elbow sleeve is greater than the length of the bending wrinkle of the pipe, and the difference between the two is not less than 100mm; the outer diameter of the two end ports of the wrinkle defect covering elbow sleeve is greater than the outer diameter of the pipe, and the difference between the two is not less than 100mm; the overall bending radius of the wrinkle defect covering elbow sleeve is three times the radius of the two end ports; the central angle of the wrinkle defect covering elbow sleeve is b', a'=a'±3°.

[0018] Further, the straight pipe section sleeve and the one end of the wrinkle defect covering elbow sleeve are respectively provided with a welding bevel.

[0019] Further, the outer diameter of the two end ports of the wrinkle defect covering elbow sleeve is not less than the outer diameter of the one end of the straight pipe section sleeve, and the difference between the two is 0-6mm; the outer diameter of the one end of the straight pipe section sleeve welded with the pipe is not less than the outer diameter of the pipe, and the difference between the two is 0-6mm.

[0020] The beneficial effects of the present application are: the different bevel angles and protruding sizes of the bending wrinkle generated during the bending process of the pipe can be effectively classified and repaired, there is a larger repair cavity, the problems of bevel angle and local protrusion of the bending wrinkle are solved, and according to the specific size of the defect, a suitable standard part can be selected for combined repair to reduce the repair cost.

[0021] A pipe bending wrinkle defect classification repair method is also provided, comprising the following steps:

[0022] Step one, measuring the bending angle of the pipe section at both ends of the pipe bending wrinkle;

[0023] Step two, selecting an appropriate repair scheme according to the bending angle, specifically as follows:

[0024] If the bending angle is not greater than 10°, a B-type sleeve and a wrinkle defect covering elbow sleeve of an appropriate size are combined and assembled to form a series of sleeves for defect repair;

[0025] If the bending angle is greater than 10°, a reducing sleeve and a wrinkle defect covering elbow sleeve of an appropriate size are combined and assembled to form a series of sleeves for defect repair;

[0026] Step three, according to the scheme selected in step two, the wrinkle defect covering elbow sleeve and the straight pipe section sleeve are respectively covered on the pipe bending wrinkle and the pipe at both ends of the bending wrinkle, and then welding is completed. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1Structure diagram of pipe folding defect for the pipe folding defect repair of the invention;

[0028] Figure 2 Structure diagram of one embodiment of the pipe folding defect repair of the invention;

[0029] Figure 3 Structure diagram of pipe folding defect for the pipe folding defect repair of the invention;

[0030] Figure 4 Structure diagram of another embodiment of the pipe folding defect repair of the invention;

[0031] Figure 5 Structure diagram of another embodiment of the pipe folding defect repair of the invention;

[0032] Figure 6 Structure diagram of the conventional B-type sleeve for repairing pipe defects.

[0033] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0034] 1, straight pipe section sleeve; 2, folding defect cladding elbow sleeve. DETAILED DESCRIPTION

[0035] The principles and features of the invention are described below in conjunction with the drawings, and the examples are only used to explain the invention and not to limit the scope of the invention.

[0036] Embodiment:

[0037] The conventional B-type sleeve for repairing pipe defects is shown in Figure 6 The B-type sleeve (F in the figure) usually includes two symmetrical half-cylinder arc plates, which are installed by first clamping the two plates on the upper and lower sides of the steel pipe to be repaired and wrapping the defects, then welding the two half-cylinders into a complete cylinder through two longitudinal welds, and finally welding the sleeve and the steel pipe to be repaired together through two circumferential fillet welds at the ends of the cylinder. It can only be used to repair concentric steel pipe components with the same external profile on both sides of the defects, and cannot effectively repair different degrees of oblique angles and local protrusion sizes of pipe folding defects.

[0038] The pipe folding defect repair of the invention is a series of sleeve structures (as shown in Figure 1 , 2, 3, 4, and 5) include two sections of straight pipe section sleeves 1 and a wrinkle defect covered elbow sleeve 2, the wrinkle defect covered elbow sleeve 2 is a elbow sleeve, used to cover the miter part of the pipeline and the outside of the pipeline buckling fold A, the two sections of the straight pipe section sleeve 1 are respectively welded to the two end circumferential seams of the wrinkle defect covered elbow sleeve 2, and are respectively covered on the two end pipe sections of the pipeline miter and buckling fold, and the end of the straight pipe section sleeve 1 away from the wrinkle defect covered elbow sleeve 2 is welded to the pipeline girth seam.

[0039] In this embodiment, the wrinkle defect covering elbow sleeve 2 is a curved pipe, which is divided into two along the axial direction of the pipe. That is, the wrinkle defect covering elbow sleeve 2 includes two first tube shells with semicircular longitudinal cross-sections. When covering and welding the curved wrinkles of the pipe, the two first tube shells are "enclosed" outside the curved wrinkles, and the side ends of the two first tube shells are butt-jointed and welded along the edge line.

[0040] More specifically, the wrinkle defect covering elbow sleeve 2 is an arc-shaped elbow sleeve.

[0041] In this embodiment, according to the size of the buckling fold part, the elbow sleeve 2 and the straight pipe sleeve 1 covering the fold defect are installed in the following two ways:

[0042] 1. Structure and installation method of series sleeve for small size buckling wrinkle repair (such as Figure 2 and 3 shown):

[0043] The straight pipe section sleeve 1 adopts a B-type standard sleeve; the bending angle of the pipe is α, α≤10°, the protrusion height and axial length of the pipe buckling fold are not greater than 1 / 10 of the pipe outer diameter; the length of the center line of the above-mentioned fold defect covering the elbow sleeve 2 (referred to as L3 in the figure) is greater than the length of the pipe buckling fold (referred to as L1 in the figure), and the difference between the two is not less than 100mm; the outer diameter of the two end pipe openings of the above-mentioned fold defect covering the elbow sleeve 2 (referred to as D3 in the figure) is not less than the outer diameter of the pipe (referred to as D1 in the figure), and the difference between the two is 0-6mm; the central angle of the above-mentioned fold defect covering the elbow sleeve 2 is β, β=α±3°; the installation process is as follows:

[0044] Step 1: Measure the buckling angles of the pipe sections at both ends of the pipe buckling fold;

[0045] Step 2: If the buckling angle is not greater than 10°, the straight pipe section sleeve 1 is assembled with a standard B-type sleeve (the B-type sleeve is two semi-circular tube shell components, butted and enclosed outside the pipeline, with the side edges welded and the port and the pipeline circumferential seam welded) and a fold defect covering elbow sleeve 2 of appropriate size to form a series sleeve for defect repair;

[0046] Step three, first, the fold defect covering elbow sleeve 2 and straight pipe section sleeve 1 respectively covered in the pipe flexural fold and flexural fold at both ends of the pipe, and then complete the welding.

[0047] Two, large size flexural fold repair with series sleeve structure and installation method (such as Figure 4 and 5 shown):

[0048] The above straight pipe section sleeve 1 adopts the taper sleeve, the taper bottom end of the above straight pipe section sleeve 1 is welded with the corresponding end port of the above fold defect covering elbow sleeve 2, and the taper tip end of the above straight pipe section sleeve 1 is welded with the pipe surface; wherein, the flexural angle of the above pipe is α', the above α> 10°, the protrusion height and the axial length (L1 in the figure) of the above pipe flexural fold are greater than 1 / 10 of the outer diameter (D1 in the figure) of the pipe; the length (L1 in the figure) of the center line of the above fold defect covering elbow sleeve 2 is greater than the length (L1) of the pipe flexural fold, and the difference between them is not less than 100mm; the outer diameter (D3 in the figure) of the two end ports of the above fold defect covering elbow sleeve 2 is greater than the outer diameter (D1 in the figure) of the pipe, and the difference between them is not less than 100mm; the overall bending radius of the above fold defect covering elbow sleeve 2 is three times the radius (1 / 2D3) of its two end ports; the central angle of the above fold defect covering elbow sleeve 2 is β', and the above β'=α'±3°; the installation process is as follows:

[0049] Step one, measure the flexural angle of the pipe section at both ends of the pipe flexural fold;

[0050] Step two, if the flexural angle is greater than 10°, use the taper sleeve and the fold defect covering elbow sleeve 2 of the appropriate size to assemble in series to form a series sleeve for defect repair;

[0051] Step three, first, the fold defect covering elbow sleeve 2 and straight pipe section sleeve 1 are respectively covered on the pipe flexural fold and the pipe at both ends of the flexural fold, and then the welding is completed, more specifically: installation and welding, the machined parts are assembled on the pipe, the parts are connected by butt welding method, and the small end face of the taper pipe is welded with the contact part of the pipe by annular fillet welding, so that the repair of the flexural fold defect is completed.

[0052] In the embodiment, a welding bevel is arranged at the end of the straight pipe section sleeve 1 and the fold defect covering elbow sleeve 2 which are welded with each other. The welding bevel is arranged to facilitate the rapid welding of the straight pipe section sleeve 1 and the fold defect covering elbow sleeve 2.

[0053] In the embodiment, the outer diameter of the two end ports of the wrinkle defect covering elbow sleeve 2 is not less than the outer diameter of the one end port of the straight pipe section sleeve 1 welded with the same, and the difference between the two is 0-6mm, and the outer diameter of the one end port of the straight pipe section sleeve 1 welded with the pipe (D2 in the figure) is not less than the outer diameter of the pipe, and the difference between the two is 0-6mm.

[0054] The embodiment is aimed at different bevel angles and protrusion sizes of the bending wrinkles generated in the bending process of the pipe, and the elbow (the wrinkle defect covering elbow sleeve 2) and the reducing pipe or the elbow (the wrinkle defect covering elbow sleeve 2) and the B-type sleeve standard part are used for serial assembly in stages, so that a larger repair cavity is formed, the problems of the bevel angle and the local protrusion of the pipe bending wrinkles are solved, and the standard parts suitable for the specific size of the defects can be selected for combined repair, so that the repair cost is reduced.

[0055] It should be noted that: in the embodiment, the wrinkle defect covering elbow sleeve 2 can use a conventional elbow, and in the case that the axial length of the pipe bending wrinkles is large, an elbow pipe can also be used to replace the elbow for repair. The butt weld form can be used for each part, and the lap fillet weld form can also be used.

[0056] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0057] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0058] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A series sleeve structure for repairing a pipe buckling wrinkle defect, characterized by: The application relates to a sleeve (1) and a sleeve (2) for covering a pipe bend defect, wherein the sleeve (1) is a straight pipe sleeve, the sleeve (2) is a bend sleeve, and the two sleeves are connected by ring welding.

2. A series sleeve structure for repairing a buckling wrinkle defect of a pipe according to claim 1, characterized in that: The sleeve (2) comprises two first pipe shells with a semicircular annular longitudinal section, and the two first pipe shells are connected by edge welding.

3. A series sleeve structure for repairing a buckling wrinkle defect of a pipe according to claim 2, characterized in that: The sleeve (2) is a circular arc bend sleeve.

4. The serial sleeve structure for repairing pipeline buckling and wrinkling defects according to claim 3 is characterized by: The sleeve (1) is a B-type standard sleeve.

5. The series sleeve structure for repairing a buckling wrinkle defect of a pipe according to claim 4, characterized in that: The pipe bend angle is alpha, alpha<=10 DEG, the protruding height and the axial length of the pipe bend are not more than 1 / 10 of the pipe outer diameter, the length of the center line of the sleeve (2) is greater than the length of the pipe bend, and the difference is not less than 100 mm, the outer diameter of the two end ports of the sleeve (2) is not less than the outer diameter of the pipe, and the difference is 0-6 mm, the central angle of the sleeve (2) is beta, and beta=alpha+ / -3 DEG.

6. A series sleeve structure for repairing a buckling wrinkle defect of a pipe according to claim 3, characterized in that: The sleeve (1) is a conical frustum reducer sleeve, the conical bottom end of the sleeve (1) is welded with the corresponding end port of the sleeve (2), and the conical tip end of the sleeve (1) is welded with the pipe surface.

7. The series sleeve structure for repairing a buckling wrinkle defect of a pipe according to claim 6, characterized in that: The pipe bend angle is alpha', alpha>10 DEG, the protruding height and the axial length of the pipe bend are greater than 1 / 10 of the pipe outer diameter, the length of the center line of the sleeve (2) is greater than the length of the pipe bend, and the difference is not less than 100 mm, the outer diameter of the two end ports of the sleeve (2) is greater than the outer diameter of the pipe, and the difference is not less than 100 mm, the overall bending radius of the sleeve (2) is three times the radius of the two end ports, the central angle of the sleeve (2) is beta', and beta'=alpha'+ / -3 DEG.

8. A series sleeve structure for repairing a buckling wrinkle defect of a pipe according to any one of claims 4 to 7, characterized in that: The end of the sleeve (1) and the sleeve (2) welded with each other is provided with a welding bevel.

9. A series sleeve structure for repairing a buckling wrinkle defect of a pipe according to any one of claims 4 to 7, characterized in that: The outer diameter of the two end ports of the sleeve (2) is not less than the outer diameter of the end port of the sleeve (1) welded with each other, and the difference is 0-6 mm, and the outer diameter of the end port of the sleeve (1) welded with the pipe is not less than the outer diameter of the pipe, and the difference is 0-6 mm.

10. A method for grading and repairing a pipe buckling wrinkle defect, using the series sleeve structure for repairing a pipe buckling wrinkle defect according to any one of claims 4 to 9, characterized in that, The application further relates to a pipe defect repairing method. Step one is measuring the bend angle of the pipe bend. Step two is selecting a repairing scheme according to the bend angle, and the scheme is as follows: If the bend angle is not greater than 10 DEG, a B-type sleeve and a sleeve (2) for covering a pipe bend defect are combined and assembled to form a series connection sleeve, and the defect is repaired. If the bending angle is greater than 10°, the combination assembly is carried out by using a size-difference sleeve and a folding defect covering elbow sleeve (2) of an appropriate size to form a series sleeve for defect repairing; Step three, according to the scheme selected in step two, the folding defect covering elbow sleeve (2) and the straight pipe sleeve (1) are respectively covered on the pipe bending fold and the two ends of the pipe bending fold, and then welding is completed.

Images