Test method for determination of pull force for long distance multi-bend subsea pipeline stabbing repair

Abstract

The present application relates to a kind of long-distance multi-bend submarine pipeline insertion repair traction force determination test method, comprising the following steps: according to actual engineering, determine pipe parameter, the pipe parameter is pipe diameter, bend number, bend angle, bend radius and straight pipe length;On the basis of pipe parameter, build test platform and connect pipe according to the order of bend and straight pipe section;Lubricating oil is smeared on the outer surface of inner lining hose;Winch is dragged through the inner lining hose from reel through pipe by traction rope;In the process of passing through pipe with inner lining hose, the data of pull dynamometer and displacement meter are recorded synchronously by data acquisition instrument.The present application can study the change rule of traction force in the process of insertion, so as to evaluate the feasibility of scheme in actual engineering, ensure that long-distance multi-bend submarine pipeline insertion repair engineering can be completed at one time.

Description

Technical Field

[0001] This invention relates to the field of trenchless repair technology for inserting flexible liners, specifically to a test method for measuring the traction force in the repair of long-distance, multi-bend subsea pipelines. Background Technology

[0002] Pipeline leakage and damage are widespread problems. In my country's small and medium-sized towns, the leakage rate is even higher, reaching 35-42%, and in some cases exceeding 50%, far exceeding the national target of 10%. Besides the direct economic costs, pipeline damage can also cause a series of secondary disasters. It may lead to environmental pollution and potentially major explosions, causing enormous property damage and personal injury.

[0003] Submarine long-distance oil and gas pipelines typically operate at high pressures and involve highly corrosive media. Limited by seabed depth and topography, their routes are often winding and complex, with numerous bends and high curvatures, making maintenance difficult. When they reach the end of their service life or experience a fatal failure, they often have to be scrapped and replaced, incurring huge costs. Using flexible hose lining technology can avoid submarine construction work, shorten pipeline repair time, and extend service life, resulting in significant economic benefits. However, due to the long distances and numerous bends of submarine pipelines, whether the traction force during flexible hose lining repair meets the material strength requirements is a crucial factor determining the success of the repair. Currently, there is no accurate testing method to measure the changes in traction force during the submarine pipeline lining process. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide an experimental method for measuring the traction force during the interlacing repair of long-distance, multi-bend subsea pipelines. This method can study the variation law of traction force during the interlacing process, thereby evaluating the feasibility of the scheme in actual engineering and ensuring that the interlacing repair project of long-distance, multi-bend subsea pipelines can be completed in one go.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a test method for measuring the traction force during the repair of long-distance, multi-bend subsea pipelines, comprising the following steps:

[0007] The pipeline parameters are determined based on the actual project, including pipe diameter, number of elbows, elbow angle, elbow radius, and straight pipe length.

[0008] Based on the pipeline parameters, a test platform was built and the pipeline was connected in the order of elbows and straight pipe sections.

[0009] Apply lubricant to the outer surface of the inner liner hose;

[0010] The winch uses a traction rope to pull the inner-lined hose from the reel through the pipe;

[0011] During the process of threading the inner lining hose through the pipe, the data from the tension gauge and displacement gauge are recorded simultaneously using a data acquisition device.

[0012] The aforementioned test method, preferably, includes the following steps in determining the pipeline parameters based on actual engineering conditions:

[0013] The outer pipe diameter is determined based on the actual project, and the elbow curvature radius is determined by 5 times the pipe diameter.

[0014] Determine the number and angle of the bends;

[0015] The length of the straight pipe will be reduced according to the actual length of the straight pipe section in the project and the actual size of the site;

[0016] Determine the diameter of the inner flexible hose based on the determined pipe diameter.

[0017] The aforementioned test method, preferably, includes the following steps in setting up the test platform and connecting the pipes in the order of elbows and straight pipe sections:

[0018] Based on the maximum pipe height after scaling down the straight pipe section in the actual project, a steel frame is built, and the pipe is fixed by welding angle steel.

[0019] Connect the pipes section by section using flange bolts, following the order of elbow angles and straight pipe sections.

[0020] The aforementioned test method, preferably, includes the following steps in which the winch pulls the inner liner hose from the reel and through the pipe using a traction rope:

[0021] Multiple cleaning operations were performed using a pipeline cleaning pig to ensure that the pig could pass through all bends in the pipeline smoothly and to keep the pipeline unobstructed.

[0022] One end of the traction rope is connected to the winch, and the other end passes through the pipe via a pig and connects to the anti-clogging joint of the inner lining hose; a swivel joint is installed between the traction rope and the anti-clogging joint of the inner lining hose to release the torsion of the traction rope.

[0023] The winch starts working, dragging the inner lining hose and moving it through the pipe.

[0024] In the aforementioned test method, preferably, the front end circumference of the anti-jamming connector is smaller than that of the rear end, and the front end gradually narrows to the rear end; the friction part between the anti-jamming connector and the pipeline has a curvature to prevent jamming at the misalignment of the pipeline flange.

[0025] In the aforementioned test method, preferably, the tension gauge is connected to the traction rope at the winch end to measure the tension data;

[0026] The displacement gauge is installed at the pipe inlet end and is manually controlled to be in close contact with the outer surface of the hose to measure the dragging distance.

[0027] The data from the force gauge and the displacement gauge are simultaneously transmitted to the data acquisition instrument to generate a force-displacement curve in real time.

[0028] The present invention has the following advantages due to the adoption of the above technical solutions:

[0029] This invention can measure the traction force for the intersecting repair of long-distance, multi-bend submarine pipelines, assess the feasibility of the project, and take corresponding drag reduction measures to ensure the smooth progress of the repair project. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0031] Figure 1 This is a structural flowchart of the test method for measuring the traction force of long-distance, multi-bend submarine pipeline penetration repair as described in this invention;

[0032] Figure 2 This is a flowchart of the test method for measuring the traction force during the interlacing repair of long-distance, multi-bend submarine pipelines as described in this invention. Detailed Implementation

[0033] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0034] This invention provides a test method for measuring the traction force during the interlacing repair of long-distance, multi-bend subsea pipelines. This method can study the variation law of traction force during the interlacing process, thereby evaluating the feasibility of the scheme in actual engineering and ensuring that the interlacing repair project of long-distance, multi-bend subsea pipelines can be completed in one go.

[0035] like Figure 1 As shown, the system of the test method for measuring the traction force of long-distance, multi-bend submarine pipeline intersecting repair according to the present invention includes a test platform, a power system, a sensor system, and a data acquisition system.

[0036] The test platform includes multiple bends, straight pipes and a steel frame platform; the power system includes a winch; the sensor system includes a force gauge and a displacement gauge; and the data acquisition system includes a data acquisition instrument.

[0037] like Figure 2 As shown, the test method for measuring the traction force during the interlacing repair of long-distance, multi-bend subsea pipelines provided by this invention includes the following steps:

[0038] S1. Determine the pipeline parameters based on the actual project. The pipeline parameters are pipe diameter, number of elbows, elbow angle, elbow radius, and straight pipe length.

[0039] S2. Based on the pipeline parameters, build a test platform and connect the pipeline in the order of elbows and straight pipe sections.

[0040] S3. Apply lubricating oil to the outer surface of the inner lining hose;

[0041] S4. Use a traction rope to pull the inner liner hose from the reel through the pipe using a winch; the traction rope can be a steel wire rope or an ultra-high molecular weight polyethylene fiber cable.

[0042] S5. During the process of passing the inner lining hose through the pipe, the data of the tension gauge and displacement gauge are recorded simultaneously by the data acquisition instrument.

[0043] In the above embodiments, preferably, determining the pipeline parameters based on the actual engineering situation includes the following steps:

[0044] (1) Determine the outer pipe diameter based on the actual project, and determine the elbow curvature radius by using 5 times the pipe diameter;

[0045] (2) Determine the number and angle of the elbows;

[0046] (3) The length of the straight pipe is reduced according to the actual length of the straight pipe section in the project and the actual size of the site;

[0047] (4) Determine the diameter of the inner lining hose based on the determined pipe diameter.

[0048] In the above embodiments, preferably, the steps of setting up the test platform and connecting the pipes in the order of elbows and straight pipe sections include the following:

[0049] (1) Based on the maximum pipe height after the straight pipe section of the actual project is reduced, a steel frame is built and the pipe is fixed by welding angle steel.

[0050] (2) Connect the pipes section by section using flange bolts, following the order of elbow angles and straight pipe sections.

[0051] In the above embodiments, preferably, the step of using a winch to pull the inner liner hose from the reel and through the pipe via a traction rope includes the following steps:

[0052] (1) Use the pipeline cleaning ball multiple times to ensure that the pipeline cleaning ball can pass through all the bends in the pipeline smoothly and ensure that the pipeline is unobstructed.

[0053] (2) One end of the traction rope is connected to the winch, and the other end passes through the pipeline through the pig and is connected to the anti-blocking joint of the inner lining hose; a swivel joint needs to be installed between the traction rope and the anti-blocking joint of the inner lining hose to release the torsion of the traction rope.

[0054] (3) The winch starts working, dragging the inner lining hose and moving it through the pipe.

[0055] In the above embodiments, preferably, the front end circumference of the anti-jamming connector is smaller than that of the rear end, and the front end gradually narrows to the rear end; the friction part between the anti-jamming connector and the outer pipe has a certain curvature to prevent jamming at the misalignment of the pipe flange.

[0056] In the above embodiments, preferably, the force gauge is connected to the traction rope at the winch end to measure the tension data; the displacement gauge is set at the pipe inlet end and is manually controlled to be in close contact with the outer surface of the hose to measure the dragging distance; the data from the force gauge and the displacement gauge are simultaneously transmitted to the data acquisition instrument to generate a force-displacement curve in real time.

[0057] In addition, it should be noted that the tensile tester calculates the magnitude of the force applied to the test object by measuring the deformation of the elastic element. It has temperature self-compensation and creep self-compensation functions to eliminate the influence of temperature and creep on the measurement results. The measurement accuracy is 0.02 tons (%FS).

[0058] A displacement gauge converts the displacement of an object into the stretching or contraction of a rope, and then determines the magnitude of the object's displacement by measuring the change in the rope's length. This device typically consists of a fixed pulley and a movable pulley. The rope forms a closed loop through these two pulleys. The object's displacement causes a change in the pulley's position due to the rope's stretching or contraction, and the displacement sensor measures the pulley's position to determine the amount of displacement.

[0059] The data acquisition unit can collect data generated by various sensors, instruments, and devices in real time and monitor and display it in a graphical interface. It can communicate with various sensors and devices, including those monitoring parameters such as temperature, pressure, flow rate, current, and voltage. It has data storage and recording functions, allowing it to save and archive the collected data for subsequent analysis and report generation.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test method for determining the traction force during the interlacing repair of long-distance, multi-bend subsea pipelines, characterized in that, Includes the following steps: The pipeline parameters are determined based on the actual project, including pipe diameter, number of elbows, elbow angle, elbow radius, and straight pipe length. Based on the pipeline parameters, a test platform was built and the pipeline was connected in the order of elbows and straight pipe sections. Apply lubricant to the outer surface of the inner liner hose; The winch uses a traction rope to pull the inner liner hose from the reel and through the pipe, specifically: Multiple cleaning operations were performed using a pipeline cleaning pig to ensure that the pig could pass through all bends in the pipeline smoothly and to keep the pipeline unobstructed. One end of the traction rope is connected to the winch, and the other end passes through the pipe via a pig and connects to the anti-clogging joint of the inner lining hose; a swivel joint is installed between the traction rope and the anti-clogging joint of the inner lining hose to release the torsion of the traction rope. The winch starts working, dragging and moving the inner liner hose through the pipe; During the process of passing the inner lining hose through the pipe, the data of the tension gauge and displacement gauge are recorded simultaneously by the data acquisition instrument. The tension gauge is connected to the traction rope at the winch end to measure the tension data.

2. The test method according to claim 1, characterized in that, Determining pipeline parameters based on actual engineering projects includes the following steps: The outer pipe diameter is determined based on the actual project, and the elbow curvature radius is determined by 5 times the pipe diameter. Determine the number and angle of the bends; The length of the straight pipe will be reduced according to the actual length of the straight pipe section in the project and the actual size of the site; Determine the diameter of the inner flexible hose based on the determined pipe diameter.

3. The test method according to claim 2, characterized in that, The steps of setting up the test platform and connecting the pipes in the order of elbows and straight pipe sections are as follows: Based on the maximum pipe height after scaling down the straight pipe section in the actual project, a steel frame is built, and the pipe is fixed by welding angle steel. Connect the pipes section by section using flange bolts, following the order of elbow angles and straight pipe sections.

4. The test method according to claim 1, characterized in that, The anti-jamming connector has a smaller front circumference than the rear circumference and gradually narrows from the front to the rear circumference; the friction part between the anti-jamming connector and the pipeline has a curvature to prevent jamming at the misalignment of the pipeline flange.

5. The test method according to claim 1, characterized in that, The displacement gauge is installed at the pipe inlet end and is manually controlled to be in close contact with the outer surface of the hose to measure the dragging distance. The data from the force gauge and the displacement gauge are simultaneously transmitted to the data acquisition instrument to generate a force-displacement curve in real time.

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