Eccentric structure coating sleeve for re-repairing defects of pipeline plugging tee joint and re-repairing method
The eccentric structure covering sleeve assembled by combining a tee pipe and a reducer solves the problem that traditional sleeves cannot repair the eccentric structure of the tee blocking the pipeline, achieves efficient and economical repair effects, and is suitable for pipeline defects of different specifications and sizes.
Patent Information
- Application Number
- CN202410500170.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2025-10-24
AI Technical Summary
Traditional B-type sleeves cannot repair the eccentric structural defects of pipeline sealing tees, and contoured sleeve repairs require the customization of special molds with high costs and low utilization rates.
The eccentric structure covering sleeve assembled by a tee pipe and a reducer is connected by butt welds and annular fillet welds to repair the eccentric structure defects. Standard parts are used to meet the repair needs of different specifications and sizes.
It achieves efficient repair of eccentric structural defects, reduces repair costs, improves the flexibility and applicability of repair work, and enhances the sealing and strength of the structure.
Smart Images
Figure CN120830780A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of oil and gas pipeline repair, and particularly relates to a pipeline plugging tee defect re-repair eccentric structure cladding sleeve and a re-repair method. BACKGROUND
[0002] Pipeline is the main form of crude oil transportation in China. Due to the electrochemical corrosion of crude oil, the scouring of mechanical impurities in crude oil to the inner wall of the pipeline, and the stray current corrosion in the soil, the pipeline is prone to corrosion perforation and cracking, and the crude oil in the pipeline will be leaked, which will cause crude oil leakage, environmental pollution, and even fire and explosion accidents. The pipeline plugging tee is a special tee for pipeline pressure plugging operation, which is a key product for realizing pipeline pressure plugging operation without stopping transportation, and is an important accessory for ensuring the safety of pipeline production. However, due to the opening precision and welding quality, leakage occurs at the welding seam between the pipeline and the plugging tee after the repair of the plugging tee, and secondary reinforcement repair is required.
[0003] In-service welding is an environmentally friendly, economical and efficient oil and gas pipeline repair technology, which ensures the continuous and safe operation of the pipeline. The B-type sleeve repair technology is a permanent repair method for oil and gas pipeline defects, which does not need to stop transportation, only needs to reduce pressure and limit flow, and the repair cost is only 10% of the cost of replacing the pipeline. Therefore, it is widely used in in-service pipeline defect treatment.
[0004] The pipeline plugging tee defect re-repair has an eccentric structure. The traditional B-type sleeve has a simple structure, a limited sleeve cavity and a small assembly gap, and can only be used to repair concentric steel pipe components with the same external profile on both sides of the defect, and cannot repair eccentric structure defects. If the sleeve meets the eccentric structure defect, a special mold needs to be customized for repair by using a profiled sleeve. However, the special mold itself is expensive, and the mold is special and cannot cover other specifications of defects, so the utilization rate is low. SUMMARY
[0005] In view of the fact that the traditional B-type sleeve cannot repair the eccentric structure defect of the pipeline plugging tee, and the use of a profiled sleeve for repair requires a special mold with high cost and low utilization rate, and there is a lack of an economical and efficient repair method, the application provides a pipeline plugging tee defect re-repair eccentric structure cladding sleeve and a re-repair method.
[0006] To achieve the above purpose, the application provides the following technical solutions.
[0007] The pipe blocking tee joint defect re-repair eccentric structure covering sleeve comprises a tee joint pipe, the tee joint pipe is divided into a tee joint pipe upper part and a tee joint pipe lower part, the tee joint pipe upper part and the tee joint pipe lower part are connected to cover and block the tee joint, and the tee joint pipe upper part and the tee joint pipe lower part constitute a tee joint pipe.
[0008] The eccentric structure further comprises a reducer upper part and a reducer lower part, the reducer upper part and the reducer lower part are connected to cover and block the part of the pipe connected with the tee joint, and the reducer upper part and the reducer lower part constitute a reducer, both ends of the main pipe of the tee joint pipe are connected with the large-diameter port of the reducer, the small-diameter port of the reducer is connected with the pipe, and the branch pipe of the tee joint pipe is connected with the head.
[0009] The outer diameter of the main pipe of the tee joint pipe is greater than the outer diameter of the branch pipe, the outer diameter of the branch pipe of the tee joint pipe is greater than the maximum value of the flange diameter of the blocking tee joint and the outer diameter of the pipe 1, and the gap allowance is greater than 20 mm.
[0010] The length of the main pipe of the tee joint pipe is greater than the minimum value of the length of the blocking tee joint and the flange diameter, and the gap allowance is greater than 20 mm.
[0011] The center-to-end surface dimension of the branch pipe of the tee joint pipe is greater than the sum of the flange height of the blocking tee joint, the wall thickness of the blocking tee joint, the assembly gap of the blocking tee joint and the pipe, and half of the outer diameter of the pipe, and the gap allowance is greater than 10 mm.
[0012] The outer diameter of the head is based on the outer diameter of the branch pipe of the tee joint pipe, and the error is within ±2 mm.
[0013] The outer diameter of the large end of the reducer is based on the outer diameter of the main pipe of the tee joint pipe, and the error is within ±2 mm; and the outer diameter of the small end of the reducer is based on the outer diameter D1 of the pipe, and the error is between 0 and 6 mm.
[0014] The tee joint pipe upper part and the tee joint pipe lower part are welded by using butt welds, the reducer upper part and the reducer lower part are welded by using butt welds, and the branch pipe port of the tee joint pipe and the head are welded by using butt welds.
[0015] The large-diameter port of the reducer and the main pipe of the tee joint pipe are welded by using butt welds, and the small-diameter port of the reducer and the contact part of the pipe are welded by using annular fillet welds.
[0016] The repair method of the pipe blocking tee joint defect re-repair eccentric structure covering sleeve is as follows:
[0017] Select the tee joint pipe, the special-shaped pipe and the head;
[0018] Divide the tee joint pipe into a tee joint pipe upper part and a tee joint pipe lower part along the main pipe axis, process a bevel, divide the reducer into a reducer upper part and a reducer lower part along the axis, and process a bevel;
[0019] The upper part of the tee pipe and the lower part of the tee pipe are connected to form a tee pipe cladding to block the tee, the upper part of the reducing pipe and the lower part of the reducing pipe are connected to cover the pipeline at both ends of the main pipe of the tee pipe, the large diameter port of the reducing pipe is connected with the main pipe port of the tee pipe, and the small diameter port of the reducing pipe is connected with the contact part of the pipeline; the branch pipe port of the tee pipe is connected with the head, and the pipeline blocking tee defect is repaired again.
[0020] The tee pipe is divided along the radial direction of the main pipe body, and the special-shaped pipe is divided along the radial direction of the pipe body.
[0021] Compared with the prior art, the beneficial effects of the present application are that:
[0022] The pipeline blocking tee defect to be repaired is an eccentric structure, the tee pipe structure adopted by the present application can well meet the repair requirements, the head is matched to be used as the sealing surface of the tee branch pipe end, and the reducing pipe is matched to be used to connect the tee pipe and the pipeline, so that the installation and sealing requirements of the cladding structure are met.
[0023] When selecting the sleeve fittings, the size requirements of the pipeline and the blocking tee are considered, the specific size requirements of the tee, the head and the reducing pipe are proposed, the selection requirements of the fittings are formulated, and the welding repair quality is ensured; and the present application can be applied to pipeline defects of different specifications and sizes, and the flexibility and applicability of the repair work are improved. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows:
[0025] Figure 1 It is a blocking tee repair schematic view;
[0026] Figure 2 It is a structure schematic view of the eccentric structure cladding sleeve for repairing the pipeline blocking tee defect;
[0027] Figure 3 It is a size schematic view of the eccentric structure cladding sleeve for repairing the pipeline blocking tee defect;
[0028] In the drawings, 1 is a pipeline, 2 is a blocking tee, 3 is a tee pipe, 4 is a head, 5 is a reducing pipe, 6 is an upper part of the tee pipe, 7 is a lower part of the tee pipe, 8 is an upper part of the reducing pipe, and 9 is a lower part of the reducing pipe. DETAILED DESCRIPTION
[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.
[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.
[0031] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0032] In the description of the embodiments of the present application, it should be noted that, if the orientation or position relationship indicated by the terms "upper", "lower", "horizontal", "inner" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.
[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0034] In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly specified and limited, if the terms "arrange", "mount", "connect", "connect" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0035] The present application will be further described in detail below with reference to the accompanying drawings:
[0036] As Figure 1The figure shows a schematic diagram of the repair of the blocking tee. Pipeline 1 is connected to both ends of the blocking tee 2. After the blocking tee is repaired, leakage occurs at the weld between pipeline 1 and blocking tee 2, requiring secondary reinforcement and repair.
[0037] The present invention provides an eccentric structure covering sleeve and a repair method for repairing pipeline tee defects. The sleeve is assembled by combining standard parts of a tee pipe and a reducer. It has a larger repair cavity and can select suitable standard parts for combined repair according to the specific size of the defect, thereby reducing the repair cost.
[0038] like Figure 2 As shown, the eccentric structure covering sleeve for repairing the defect of the pipeline plugging tee of the present invention includes a tee 3, a head 4 and a reducer 5. The tee 3 includes an upper tee part 6 and a lower tee part 7. The upper tee part 6 and the lower tee part 7 are welded to cover the sealing tee 2. Both ends of the main pipe of the tee 3 are connected to the large diameter opening of the reducer 5. The reducer 5 includes an upper reducer part 8 and a lower reducer part 9. The upper reducer part 8 and the lower reducer part 9 are connected to cover the part of the pipeline 1 connected to the sealing tee 2. The small diameter opening of the reducer 5 is welded to the contact part of the pipeline 1 by an annular fillet weld. The branch pipe of the tee 3 is connected to the head 4.
[0039] like Figure 1 and Figure 3 Set the outer diameter of the main pipe of the tee to D4, the outer diameter of the branch pipe of the tee to D3, the outer diameter of the small end of the reducer to D5, the dimension from the center of the tee to the end face of the main pipe to C, the dimension from the center of the tee to the end face of the branch pipe to M, the outer diameter of pipe 1 to D1, the flange diameter of blocking tee 2 to D2, the flange height of blocking tee 2 to H, the wall thickness of blocking tee 3 to t, the assembly clearance to G, and the length of the blocking tee to L.
[0040] Pipeline blocking tee defect re-repair eccentric structure covering sleeve size requirements:
[0041] The tee 3 is selected with the purpose of completely covering and plugging the tee defects and the pipeline in the area. Since the tee 3 is formed by thermomechanical drawing, the main pipe outer diameter D4 of the tee 3 is generally larger than the branch pipe outer diameter D3 of the tee. Therefore, the branch pipe outer diameter D3 of the selected tee should be larger than the maximum value of the blocking tee flange diameter D2 and the outer diameter D1 of the pipeline 1, and the clearance margin should be controlled above 20mm; the dimension C×2 from the center of the tee to the main pipe end face (i.e., the length of the tee) should be larger than the minimum value of the blocking tee length L and the blocking tee flange diameter D2, and the clearance margin should be controlled above 20mm; the dimension M from the center of the tee to the branch pipe end face should be larger than the blocking tee flange height H+blocking tee wall thickness t+assembly gap G+1 / 2 pipeline outer diameter D1, and the clearance margin should be controlled above 10mm.
[0042] The selection of the head 4 takes the branch pipe outer diameter D3 of the tee pipe as the outer diameter reference of the head 4, and the error is within ±2mm.
[0043] The selection of the reducing pipe 5 takes the main pipe outer diameter D4 of the tee pipe as the outer diameter reference of the large end of the reducing pipe, and the error is within ±2mm; and takes the pipeline outer diameter D1 as the outer diameter reference of the small end of the reducing pipe, and the error is a positive deviation between 0-6mm.
[0044] According to the above-mentioned pipeline plugging tee defect reparation eccentric structure coating sleeve size requirement selection tee pipe 3, special-shaped pipe 5 and head 4 as assembly parts, wherein, because each assembly part is a standard size, it is easy to produce and purchase, and the alignment accuracy between the assembly parts is high, and the installation welding is relatively easy;
[0045] According to the above-mentioned pipeline plugging tee defect reparation eccentric structure coating sleeve size requirement selection tee pipe 3, special-shaped pipe 5 and head 4 as assembly parts, wherein, because each assembly part is a standard size, it is easy to produce and purchase, and the alignment accuracy between the assembly parts is high, and the installation welding is relatively easy;
[0046] Machining of the assembly parts, in order to facilitate the installation of in-service pipeline repair, the tee pipe 3 can be divided into tee pipe upper part 6 and tee pipe lower part 7 along the tee main pipe axis, and the groove is machined, and the special-shaped pipe 5 is divided into reducing pipe upper part 8 and reducing pipe lower part 9 along the pipe body radial direction, and the groove is machined; the tee pipe 3 is divided along the main pipe body radial direction, which can be selected at a horizontal position, or at other positions avoiding the larger curvature of the tee.
[0047] Installation and welding, the machined parts are assembled to the pipeline, the tee pipe upper part 6 and the tee pipe lower part 7 are welded by butt welding to form the tee pipe 3 coating plugging tee 2, the reducing pipe upper part 8 and the reducing pipe lower part 9 are welded by butt welding at both ends of the main pipe of the tee pipe 3 to form the reducing pipe 5 coating pipeline 1, the large diameter port of the reducing pipe 5 is welded by butt welding with the main pipe port of the tee pipe 3, the small diameter port of the reducing pipe is welded by annular fillet welding with the contact part of the pipeline 1, and the branch pipe port of the tee pipe 3 is welded by butt welding with the head 4, which can complete the pipeline plugging tee defect reparation.
[0048] The eccentric structure coating sleeve of the application has a clever design, and can effectively repair the pipe blocking tee defects by combining the eccentric reducer and the tee pipe. When the tee pipe and the eccentric reducer are assembled, there is a large repair cavity, which meets the requirements of pipe eccentric structure defect coating, and according to the defect size, the appropriate standard parts can be selected for combination repair, thereby reducing the repair cost. The butt weld and the annular fillet weld are used for the parts, which further enhances the sealing and strength of the structure and improves the repair quality. Since the oil and gas pipelines play an important role in the crude oil transportation in China, and the pipeline corrosion and cracking problems occur frequently, the eccentric structure coating sleeve and the repair method have a wide application prospect. They can not only be used for emergency repair to ensure the safe production of the pipeline, but also be used for the treatment of in-service pipeline hazards, thereby improving the service life and safety of the pipeline.
[0049] Embodiment
[0050] The eccentric structure coating sleeve for repairing the pipe blocking tee defect in the embodiment comprises a tee pipe 3, a head 4 and an eccentric reducer 5. The tee pipe 3 comprises a tee pipe upper part 6 and a tee pipe lower part 7. The tee pipe upper part 6 and the tee pipe lower part 7 are welded to coat and block the tee 2. The main pipe of the tee pipe 3 is connected to the large diameter port of the eccentric reducer 5 at both ends. The eccentric reducer 5 comprises an eccentric reducer upper part 8 and an eccentric reducer lower part 9. The eccentric reducer upper part 8 and the eccentric reducer lower part 9 are connected to coat and block the part of the pipeline 1 connected to the tee 2. The small diameter port of the eccentric reducer 5 is welded to the contact part of the pipeline 1 by an annular fillet weld. The branch pipe of the tee pipe 3 is connected to the head 4.
[0051] Size requirements of the eccentric structure coating sleeve for repairing the pipe blocking tee defect:
[0052] The outer diameter D1 of the steel pipe to be repaired is 559mm, the outer diameter of the blocking tee main pipe is 590mm, the outer diameter D2 of the branch pipe is 850mm, and H is 400.
[0053] The tee pipe 3 is selected to completely coat and block the tee defect and the pipeline in the region. Since the tee pipe 3 is formed by hot mechanical drawing, the outer diameter D4 of the main pipe of the tee pipe 3 is generally 1016mm, the outer diameter D3 of the branch pipe of the tee pipe is 914mm, and the gap allowance is 6mm. The length of the tee pipe is 1498mm, and the gap allowance is 6mm. The center to branch pipe end face size M of the tee pipe is 737mm, and the gap allowance is 4mm.
[0054] The head 4 is selected, and the outer diameter of the head 4 is 914mm.
[0055] The eccentric reducer 5 is selected, and the outer diameter of the large end of the eccentric reducer 5 is 1016mm. The outer diameter of the small end of the eccentric reducer 5 is 610mm.
[0056] The above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the above examples, ordinary skilled person in the art can still modify or equivalently replace the specific implementation of the present application without departing from the spirit and scope of the present application. Any modification or equivalent replacement without departing from the spirit and scope of the present application is intended to be within the scope of the claims of the present application.
Claims
1. A pipe plugging tee defect reparation eccentric structure covering sleeve, characterized in that, The three-way pipe (3) is divided into a three-way pipe upper part (6) and a three-way pipe lower part (7), and the three-way pipe upper part (6) and the three-way pipe lower part (7) are connected to cover and block the three-way (2). The eccentric pipe upper part (8) and the eccentric pipe lower part (9) are connected to cover and block the part of the pipeline (1) connected with the three-way (2), and the eccentric pipe upper part (8) and the eccentric pipe lower part (9) constitute the eccentric pipe (5), the main pipe of the three-way pipe (3) is connected with the large-diameter port of the eccentric pipe (5), the small-diameter port of the eccentric pipe (5) is connected with the pipeline (1), and the branch pipe of the three-way pipe (3) is connected with the head (4).
2. A sleeve for repairing defects in eccentric structures of pipe block tees according to claim 1, wherein, The outer diameter of the main pipe of the three-way pipe (3) is greater than the outer diameter of the branch pipe, the outer diameter of the branch pipe of the three-way pipe (3) is greater than the maximum value of the flange diameter of the blocking three-way and the outer diameter of the pipeline 1, and the gap allowance is greater than 20 mm.
3. A sleeve for repairing defects in eccentric structures of pipe block tees according to claim 1, wherein, The length of the main pipe of the three-way pipe (3) is greater than the minimum value of the length of the blocking three-way and the flange diameter, and the gap allowance is greater than 20 mm.
4. A sleeve for repairing defects in eccentric structures of pipe block tees according to claim 1, wherein, The size from the center of the three-way pipe (3) to the end face of the branch pipe is greater than the sum of the flange height of the blocking three-way (2), the wall thickness of the blocking three-way (2), the assembly gap of the blocking three-way (2) and the pipeline (1), and half of the outer diameter of the pipeline (1), and the gap allowance is greater than 10 mm.
5. A sleeve for repairing defects in eccentric structures of pipe block tees according to claim 1, wherein, The outer diameter of the head (4) is based on the outer diameter of the branch pipe of the three-way pipe (3), and the error is within ±2 mm.
6. A pipe plugging tee defect reparation eccentric structure over sleeve according to claim 1, characterized in that, The outer diameter of the large end of the eccentric pipe (5) is based on the outer diameter of the main pipe of the three-way pipe (3), and the error is within ±2 mm; the outer diameter of the small end of the eccentric pipe (5) is based on the outer diameter D1 of the pipeline (1), and the error is between 0 and 6 mm.
7. A sleeve for repairing defects in eccentric structures of pipe block tees according to claim 1, wherein, The three-way pipe upper part (6) and the three-way pipe lower part (7) are welded by butt weld, the eccentric pipe upper part (8) and the eccentric pipe lower part (9) are welded by butt weld, and the branch pipe port of the three-way pipe (3) is welded by butt weld with the head (4).
8. A sleeve for repairing defects in eccentric structures of pipe block tees according to claim 1, wherein, The large-diameter port of the eccentric pipe (5) is welded by butt weld with the main pipe of the three-way pipe (3), and the small-diameter port of the eccentric pipe (5) is welded by annular fillet weld at the contact part with the pipeline (1).
9. The method of claim 1-8, wherein the method further comprises: The method comprises the following steps: Selecting a three-way pipe (3), an eccentric pipe (5) and a head (4); The three-way pipe (3) is divided into a three-way pipe upper part (6) and a three-way pipe lower part (7) along the main pipe axis, and the bevel is processed, and the eccentric pipe (5) is divided into an eccentric pipe upper part (8) and an eccentric pipe lower part (9) along the axis, and the bevel is processed; The three-way pipe upper part (6) and the three-way pipe lower part (7) are connected to form a three-way pipe (3) covering and blocking a three-way (2), the eccentric pipe upper part (8) and the eccentric pipe lower part (9) are connected to cover the pipeline (1) at both ends of the main pipe of the three-way pipe (3), the large-diameter port of the eccentric pipe (5) is connected with the main pipe port of the three-way pipe (3), and the small-diameter port of the eccentric pipe (5) is connected with the contact part of the pipeline (1); the branch pipe port of the three-way pipe (3) is connected with the head (4), and the repair of the pipeline blocking three-way defect is completed.
10. The method of claim 9, wherein the method further comprises: The three-way pipe (3) is divided along the radial direction of the main pipe body; the eccentric pipe (5) is divided along the radial direction of the pipe body.