Pipe replacing system and pipe replacing method for oil and gas conveying pipeline

Abstract

The invention discloses an oil and gas conveying pipeline replacement system and method, and belongs to the field of oil and gas conveying pipeline replacement. The oil and gas conveying pipeline replacement system comprises a split type cutting machine, a tensioning end face cutting device, a pipeline aligning device and a welding device used for welding a new pipe and an upstream pipeline or a downstream pipeline; the tensioning end face cutting equipment comprises two sets of tensioning end face cutting equipment which are coaxially arranged in an upstream pipeline and a downstream pipeline correspondingly, and the two sets of tensioning end face cutting equipment are connected through a center connecting pipe and used for adjusting the cutting angle of the tensioning end face cutting equipment through the center connecting pipe. And the end surfaces of the upstream pipeline and the downstream pipeline are cut into the same angle. The oil and gas conveying pipeline replacing system and method have the advantages of high precision, high efficiency, safety, flexibility, high quality and the like, the overall level of oil and gas conveying pipeline replacing construction is remarkably improved, the working efficiency is improved, and the construction quality and safety are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas pipeline replacement, and in particular to an oil and gas pipeline replacement system and method. Background Art

[0002] In the gas, water and other media transmission networks in major cities in China, the pipeline network has formed a huge system that extends in all directions. However, due to the long-term use of these pipelines, the internal parts are gradually worn out and corroded by external microorganisms, causing some pipelines to leak to varying degrees. In order to solve this problem, pipeline repair companies need to replace the leaking pipelines with new ones in the shortest possible time to reduce interference with residents' lives.

[0003] The traditional pipeline emergency repair construction method mainly includes the following steps: 1. Locate the leak point: find the location of the leaking pipeline along the pipeline. 2. Close the valve: find the upstream and downstream control valves and close them to cut off the fluid supply. 3. Evacuate the pipeline: extract the water or gas in the pipeline to ensure safe operation. 4. Cut off the leaking pipeline: use cutting tools to cut off the damaged pipeline section. 5. Measure the end face distance: the pipe worker measures the distance between the two end faces and determines the length of the new pipeline based on the measurement results. 6. Cut the new pipe: make the new pipe according to the measurement data. 7. Install the new pipe: install the new pipe in place and fix it by welding.

[0004] Although the above method can achieve the replacement of pipelines, it has the following significant disadvantages: (1) Insufficient accuracy: When cutting off the leaking pipeline, due to the effect of stress, the two end faces of the pipeline are not on the same center line, resulting in inaccurate data measured by the pipe worker. Usually, an additional length of 5 to 10 mm is required to compensate for the error, but this still cannot guarantee a complete match. (2) Time-consuming and labor-intensive: It is difficult to accurately measure the size of the new pipe at one time, and it often requires repeated grinding and measurement, which increases construction time and labor intensity. (3) Low construction efficiency: The entire process takes a long time, especially in emergency repair tasks, which seriously affects the recovery speed. Summary of the invention

[0005] The purpose of the present invention is to provide a pipe replacement system and a pipe replacement method for an oil and gas transmission pipeline to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides a pipe replacement system for oil and gas transmission pipelines, comprising a flap cutting machine for cutting a leaking pipe, a tightening end face cutting device for processing an upstream pipe and a downstream pipe after cutting the leaking pipe, a pipe joint device for aligning the two ends of a new pipe with the upstream pipe and the downstream pipe respectively after processing the upstream pipe and the downstream pipe, and a welding device for welding the new pipe to the upstream pipe or the downstream pipe; wherein the tightening end face cutting device comprises two groups of tightening end face cutting devices coaxially arranged inside the upstream pipe and the downstream pipe, respectively, the two groups of tightening end face cutting devices are connected via a central connecting pipe, and the central connecting pipe is used to adjust the cutting angle of the tightening end face cutting device so that the end faces of the upstream pipe and the downstream pipe are cut at the same angle.

[0007] Preferably, both sets of tensioning end face cutting equipment include a tensioning mechanism and an end face cutting mechanism connected to the tensioning mechanism and coaxially arranged, and the end face cutting mechanism is connected to the tensioning mechanism via a joint bearing and a positioning structure, wherein the tensioning mechanism is used to coaxially position the end face cutting mechanism inside the upstream pipeline or the downstream pipeline, the joint bearing is used to adjust the cutting angle of the end face cutting mechanism, and the positioning structure is used to position the cutting angle of the end face cutting mechanism.

[0008] Preferably, the central axis of the tensioning mechanism is movably connected to the end face cutting mechanism via a joint bearing, and the outer circumferential side of the end face cutting mechanism is positioned and connected to the outer circumferential side of the tensioning mechanism via multiple groups of positioning structures arranged evenly; The two ends of the central connecting pipe are respectively connected to the central axes of the end face cutting mechanisms of two groups of tensioning end face cutting equipment.

[0009] Preferably, each set of positioning structures comprises a telescopic rod whose two ends are movably connected to the tensioning mechanism and the end surface cutting mechanism respectively, and the outer tube and the inner tube of the telescopic rod are positioned and connected via positioning screws.

[0010] A pipe replacement method for an oil and gas transmission pipeline replacement system comprises the following steps: S1. Determine the pipeline leakage location and close the upstream valve and downstream valve of the pipeline leakage location; S2, using a split-flap cutting machine to cut the leaking pipe at the leaking location to form an upstream pipe and a downstream pipe with openings on opposite sides; S3, hoisting two sets of tensioning end face cutting equipment to the interior of the upstream pipeline and the downstream pipeline respectively, and using the tensioning mechanism of the tensioning end face cutting equipment to tighten the inner wall of the upstream pipeline or the downstream pipeline to position the end face cutting mechanism, at this time, the upstream pipeline or the downstream pipeline, the tensioning mechanism and the end face cutting mechanism are all coaxially arranged; S4, remove the positioning screws, connect the two ends of the central connecting pipe to the central axis of the end face cutting mechanism of the two sets of tensioning end face cutting devices respectively, and adjust the cutting angles of the end face cutting mechanisms of the two sets of tensioning end face cutting devices in turn, so that the cutting angles of the two sets of tensioning end face cutting devices are the same; S5. Screw on the positioning screw and remove the central connecting pipe; S6, using the end face cutting mechanisms of the two sets of tension cutting devices to cut the end faces of the upstream pipe and the downstream pipe respectively, until the cutting is completed, taking out the two sets of tension end face cutting devices, at which point the upstream pipe and the downstream pipe form grooves with the same angle; S7. Take three pairs of measuring points of the groove from top to bottom, with each pair of measuring ends located on the same axis, so as to obtain three sets of distance values; S8, taking the average of the three sets of distance values ​​as the length value of the new tube, and cutting the new tube according to the obtained length value; S9, hoist the new pipe between the upstream pipe and the downstream pipe, and use the pipe joint device to align the two ends of the new pipe with the upstream pipe and the downstream pipe respectively; S10. Use welding equipment to weld the two ends of the new pipe to the upstream pipeline and the downstream pipeline respectively.

[0011] Preferably, the cutting angle described in step S4 is 2°.

[0012] Therefore, the present invention adopts the above-mentioned oil and gas pipeline replacement system and method, which has the following beneficial effects: 1. Consistent end face cutting angle: Through the synergistic effect of two sets of tensioning end face cutting equipment and the central connecting pipe, the end faces of the upstream and downstream pipelines are ensured to be cut at the same angle (2°), which improves the docking accuracy of the new pipe with the upstream and downstream pipelines; 2. Take three pairs of measuring points and calculate the average value as the length of the new tube, which further ensures the accuracy of the length of the new tube and reduces the possible errors during welding; In summary, the present invention provides a more efficient and accurate oil and gas transmission pipeline pipe replacement system and pipe replacement method. Through precise cutting angle control, it ensures that the upstream and downstream pipeline end faces form consistent grooves, provides a good foundation for subsequent welding, improves welding quality and sealing effect, reduces rework caused by size mismatch or poor docking, saves time and cost, and provides a strong guarantee for the safe operation of urban pipeline networks.

[0013] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a layout diagram of two sets of tensioning end face cutting equipment of a pipe replacement system for oil and gas transmission pipelines of the present invention; Figure 2 A half-section diagram of a tightening end face cutting device of an oil and gas pipeline replacement system of the present invention; Figure 3 This is an appearance diagram of a tightening end face cutting device of an oil and gas pipeline replacement system according to the present invention.

[0015] Reference numerals 1. Upstream pipeline; 2. Downstream pipeline; 3. Tensioning mechanism; 4. End cutting mechanism; 5. Center connecting pipe; 6. Spherical bearing; 7. Center axis; 8. Positioning structure; 81. Telescopic rod; 82. Positioning screw. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0017] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0018] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1-Figure 3 As shown, a pipe replacement system for oil and gas transmission pipelines includes a split-flap cutting machine for cutting a leaking pipe, a tightening end face cutting device for processing an upstream pipe 1 and a downstream pipe 2 after cutting the leaking pipe, a pipe aligner for aligning two ends of a new pipe with the upstream pipe 1 and the downstream pipe 2 respectively after processing the upstream pipe 1 and the downstream pipe 2, and a welding device for welding the new pipe to the upstream pipe 1 or the downstream pipe 2; wherein the tightening end face cutting device includes two groups of tightening end face cutting devices coaxially arranged inside the upstream pipe 1 and the downstream pipe 2, respectively, and the two groups of tightening end face cutting devices are connected via a central connecting pipe 5, and the central connecting pipe 5 is used to adjust the cutting angle of the tightening end face cutting device so that the end faces of the upstream pipe 1 and the downstream pipe 2 are cut at the same angle.

[0020] Preferably, both sets of tensioning end face cutting equipment include a tensioning mechanism 3 and an end face cutting mechanism 4 connected to the tensioning mechanism 3 and coaxially arranged, and the end face cutting mechanism 4 is connected to the tensioning mechanism 3 via a joint bearing 6 and a positioning structure 8, wherein the tensioning mechanism 3 is used to coaxially position the end face cutting mechanism 4 inside the upstream pipeline 1 or the downstream pipeline 2, the joint bearing 6 is used to adjust the cutting angle of the end face cutting mechanism 4, and the positioning structure 8 is used to position the cutting angle of the end face cutting mechanism 4.

[0021] It should be noted that the above-mentioned split-flap cutting machine, tensioning mechanism 3, end face cutting mechanism 4, pipe joint device and welding equipment are all mature products on the market. This embodiment only needs to purchase and install them without any improvement, so their structural principles will not be described in detail here.

[0022] The central axis 7 of the tensioning mechanism 3 is movably connected to the end face cutting mechanism 4 via a joint bearing 6, and the outer circumferential side of the end face cutting mechanism 4 is positioned and connected to the outer circumferential side of the tensioning mechanism 3 via multiple groups of positioning structures 8 arranged evenly; the two ends of the central connecting tube 5 are respectively connected to the central axis 7 of the end face cutting mechanisms 4 of the two groups of tensioning end face cutting devices.

[0023] Each set of positioning structures 8 includes a telescopic rod 81 whose two ends are movably connected to the tensioning mechanism 3 and the end surface cutting mechanism 4 respectively. The outer tube and the inner tube of the telescopic rod 81 are positioned and connected via positioning screws 82 .

[0024] A pipe replacement method for an oil and gas transmission pipeline replacement system comprises the following steps: S1. Determine the pipeline leakage location and close the upstream valve and downstream valve of the pipeline leakage location; S2, using a split-flap cutting machine to cut the leaking pipe at the leaking position to form an upstream pipe 1 and a downstream pipe 2 with openings on opposite sides; S3, hoisting two sets of tensioning end face cutting equipment to the interior of the upstream pipeline 1 and the downstream pipeline 2 respectively, and using the tensioning mechanism 3 of the tensioning end face cutting equipment to tighten the inner wall of the upstream pipeline 1 or the downstream pipeline 2 to position the end face cutting mechanism 4, at this time, the upstream pipeline 1 or the downstream pipeline 2, the tensioning mechanism 3 and the end face cutting mechanism 4 are all coaxially arranged; S4, remove the positioning screw 82, connect the two ends of the central connecting pipe 5 to the central axis 7 of the end face cutting mechanism 4 of the two sets of tensioning end face cutting equipment respectively, and adjust the cutting angles of the end face cutting mechanism 4 of the two sets of tensioning end face cutting equipment in turn. At this time, the cutting angles of the two sets of tensioning end face cutting equipment are the same. At this time, the groove of the upstream pipe 1, the top extension line of the upstream pipe 1, the groove of the downstream pipe 2, and the bottom extension line of the downstream pipe 2 are connected in turn to form a parallelogram, which is convenient for taking points to obtain the length of the new pipe; The cutting angle described in step S4 is 2°.

[0025] S5, tighten the positioning screw 82 and remove the central connecting pipe 5; S6, using the end face cutting mechanisms 4 of the two sets of tension cutting devices to cut the end faces of the upstream pipe 1 and the downstream pipe 2 respectively, until the cutting is completed, and taking out the two sets of tension end face cutting devices, at which point the upstream pipe 1 and the downstream pipe 2 form grooves with the same angle; S7. Take three pairs of measuring points of the groove from top to bottom, with each pair of measuring ends located on the same axis, so as to obtain three sets of distance values; S8, taking the average of the three sets of distance values ​​as the length value of the new tube, and cutting the new tube according to the obtained length value; S9, hoist the new pipe between the upstream pipe 1 and the downstream pipe 2, and use the pipe aligner to align the two ends of the new pipe with the upstream pipe 1 and the downstream pipe 2 respectively; S10, using welding equipment to weld the two ends of the new pipe to the upstream pipeline 1 and the downstream pipeline 2 respectively.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An oil and gas pipeline replacement system, characterized in that: The invention comprises a split-flap cutting machine for cutting a leaking pipe, a tightening end face cutting device for processing an upstream pipe and a downstream pipe after cutting the leaking pipe, a pipe aligner for aligning the two ends of a new pipe with the upstream pipe and the downstream pipe respectively after processing the upstream pipe and the downstream pipe, and a welding device for welding the new pipe to the upstream pipe or the downstream pipe; wherein the tightening end face cutting device comprises two groups of tightening end face cutting devices coaxially arranged inside the upstream pipe and the downstream pipe respectively, the two groups of tightening end face cutting devices are connected via a central connecting pipe, and the central connecting pipe is used to adjust the cutting angle of the tightening end face cutting device so that the end faces of the upstream pipe and the downstream pipe are cut at the same angle.

2. The oil and gas pipeline replacement system according to claim 1, characterized in that: Both sets of tensioning end face cutting equipment include a tensioning mechanism and an end face cutting mechanism connected to the tensioning mechanism and coaxially arranged, and the end face cutting mechanism is connected to the tensioning mechanism via a joint bearing and a positioning structure, wherein the tensioning mechanism is used to coaxially position the end face cutting mechanism inside an upstream pipeline or a downstream pipeline, the joint bearing is used to adjust the cutting angle of the end face cutting mechanism, and the positioning structure is used to position the cutting angle of the end face cutting mechanism.

3. The oil and gas pipeline replacement system according to claim 2, characterized in that: The central axis of the tensioning mechanism is movably connected to the end face cutting mechanism via a joint bearing, and the outer circumference side of the end face cutting mechanism is positioned and connected to the outer circumference side of the tensioning mechanism via multiple groups of positioning structures arranged evenly; The two ends of the central connecting pipe are respectively connected to the central axes of the end face cutting mechanisms of two groups of tensioning end face cutting equipment.

4. The oil and gas pipeline replacement system according to claim 3, characterized in that: Each set of positioning structures comprises a telescopic rod with two ends movably connected to the tensioning mechanism and the end face cutting mechanism respectively, and the outer tube and the inner tube of the telescopic rod are positioned and connected via positioning screws.

5. A pipe replacement method for an oil and gas pipeline replacement system according to claim 1, characterized in that: The following steps are involved: S1. Determine the pipeline leakage location and close the upstream valve and downstream valve of the pipeline leakage location; S2, using a split-flap cutting machine to cut the leaking pipe at the leaking location to form an upstream pipe and a downstream pipe with openings on opposite sides; S3, hoisting two sets of tensioning end face cutting equipment to the interior of the upstream pipeline and the downstream pipeline respectively, and using the tensioning mechanism of the tensioning end face cutting equipment to tighten the inner wall of the upstream pipeline or the downstream pipeline to position the end face cutting mechanism, at this time, the upstream pipeline or the downstream pipeline, the tensioning mechanism and the end face cutting mechanism are all coaxially arranged; S4, remove the positioning screws, connect the two ends of the central connecting pipe to the central axis of the end face cutting mechanism of the two sets of tensioning end face cutting devices respectively, and adjust the cutting angles of the end face cutting mechanisms of the two sets of tensioning end face cutting devices in turn, so that the cutting angles of the two sets of tensioning end face cutting devices are the same; S5. Screw on the positioning screw and remove the central connecting pipe; S6, using the end face cutting mechanisms of the two sets of tension cutting devices to cut the end faces of the upstream pipe and the downstream pipe respectively, until the cutting is completed, taking out the two sets of tension end face cutting devices, at which point the upstream pipe and the downstream pipe form grooves with the same angle; S7. Take three pairs of measuring points of the groove from top to bottom, with each pair of measuring ends located on the same axis, so as to obtain three sets of distance values; S8, taking the average of the three sets of distance values ​​as the length value of the new tube, and cutting the new tube according to the obtained length value; S9, hoist the new pipe between the upstream pipe and the downstream pipe, and use the pipe joint device to align the two ends of the new pipe with the upstream pipe and the downstream pipe respectively; S10. Use welding equipment to weld the two ends of the new pipe to the upstream pipeline and the downstream pipeline respectively.

6. The method for replacing a pipe in an oil and gas pipeline replacement system according to claim 5, characterized in that: The cutting angle described in step S4 is 2°.

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