Efficient and accurate ocean deepwater riser flexible joint high-temperature performance test device

Abstract

The invention provides an efficient and accurate high-temperature performance testing device for a flexible joint of a marine deepwater riser. The efficient and accurate high-temperature performance testing device comprises an external heating device, a liquid medium, an inlet pipe, a high-temperature pump, an outlet pipe, a flow guide pipe, an inlet sensor, an internal heating pipe, an upper end cover, a transition pipe and an inner pipe sensor. The heat flow input power of the external heating device is controlled according to temperature information fed back by the inlet sensor, and a relatively constant-temperature liquid medium is provided, enters the flow guide pipe through the inlet pipe through the high-temperature pump and then enters the inner cavity of the test product. The power of the internal heating pipe is controlled according to temperature information fed back by the upper and lower inner pipe sensors, so that the temperature of the inner cavity of the test product is kept relatively constant. The liquid medium in the inner cavity of the test product circularly flows through the flow guide hole and the port outlet in the flow guide pipe, so that the internal heat exchange of the liquid medium in the inner cavity of the test product is promoted, the internal small temperature difference is ensured, and the test accuracy is improved.

Description

Technical Field

[0001] This invention relates to a highly efficient and accurate high-temperature performance testing device for flexible joints of deep-water marine risers, applicable to performance testing of flexible joints of deep-water marine risers under high-temperature conditions of 100℃~300℃. Background Technology

[0002] In marine underwater resource exploration and exploitation systems, pipeline systems serve as the connecting channels between surface floating platforms and underwater equipment. Flexible joints are key components connecting the pipeline system to the surface floating platform. Besides withstanding external mechanical environmental conditions, they also need to withstand the prolonged thermal load from the high-temperature liquid inside the pipeline. Flexible joints require high-temperature performance testing during the development phase, including testing their temperature environment and heat protection / cooling effects to ensure that the operating temperature of the non-metallic materials inside the flexible joint does not exceed the design value.

[0003] Current high-temperature tests mostly employ direct heating with a high-temperature medium. The high-temperature liquid medium flows through the heating device to heat the test product and then circulates back to the heating device. Due to heat dissipation, the temperature of the high-temperature medium gradually decreases, resulting in a large temperature gradient, which leads to significant test errors and substantial heat loss.

[0004] For example, the patent "A High-Temperature Heater for Irregularly Shaped Pipes" (CN210670587U) only involves heating devices for the outer wall of pipes, which has a complex structure and is not suitable for heating the inner wall of pipes. The article "Vertical Overall Buckling Test Study of Deep-Sea Ultra-Long Pipelines under High-Temperature Environments" uses a linear oil temperature loading device for oil temperature loading. Because the environment around the flexible joint of the pipeline is ambient temperature water, and the pipeline carrying the heating liquid medium is long, a large amount of heat exchange occurs during the test, resulting in significant heat loss and requiring a high-power heat source. Simultaneously, the external heat source requires a dedicated, large high-temperature liquid medium storage tank; furthermore, the poor local fluidity of the liquid medium used for heating inside the pipeline leads to uneven temperature distribution above and below the flexible joint of the deep-sea riser, resulting in significant errors in the test results. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a highly efficient and accurate high-temperature performance testing device for flexible joints of deep-sea risers. It adopts two sets of heating devices, which reduces the heat loss of the heating devices, improves the energy utilization rate, reduces the temperature gradient of the high-temperature test, thereby reducing test errors and improving the test accuracy.

[0006] The technical solution of this invention is:

[0007] A high-efficiency and precise high-temperature performance testing device for flexible joints of deep-sea risers includes: an external heating device, a liquid medium, an inlet pipe, a high-temperature pump, an outlet pipe, a guide pipe, an inlet sensor, an internal heating pipe, an upper end cover, a transition pipe, and an inner pipe sensor.

[0008] One end of the flexible joint of the deep-sea riser is closed, and the bottom of the transition pipe is sealed to the other end of the flexible joint of the deep-sea riser. An upper end cap is fixedly installed on the top of the transition pipe. A through hole is opened on the side wall of the transition pipe and an outlet pipe is installed thereon. The outlet pipe is connected to an external container, so that the inner cavity of the transition pipe is connected to the external container.

[0009] The guide tube is set in the inner cavity of the flexible joint of the deep-sea riser, so that the two are coaxial. The upper end of the guide tube is fixed on the upper end cover. Multiple guide holes are evenly distributed on the side wall of the guide tube. Multiple internal heating tubes are evenly distributed around the guide tube. The upper end of the internal heating tube is also fixed on the upper end cover.

[0010] The outer container contains a liquid medium. Under the action of a high-temperature pump, the liquid medium enters the guide pipe through the inlet pipe and flows from the lower port and guide hole of the guide pipe into the inner cavity of the flexible joint of the deep-sea riser. When the liquid medium rises to the outlet pipe, it flows into the outer container through the outlet pipe. The liquid medium enters the inner cavity of the flexible joint of the deep-sea riser through the high-temperature pump and flows out through the outlet pipe, forming a flow balance.

[0011] An external heating device is installed close to the bottom of the outer container. The power of the external heating device is controlled by the temperature information fed back by the inlet sensor located at the inlet of the guide pipe, so as to form a relative temperature balance in the external circulation and provide a constant temperature liquid medium.

[0012] Based on the liquid medium temperature information fed back from the corresponding positions of the two inner tube sensors installed at the upper and lower joints of the marine deep-water riser flexible joint, the power of the internal heating tube is controlled so that the liquid medium temperature in the inner cavity of the marine deep-water riser flexible joint remains relatively constant.

[0013] Furthermore, the transition pipe extends the inner cavity of the flexible joint of the deep-sea riser. The inner diameter of the transition pipe is denoted as A, and the inner diameter of the connection between the flexible joint of the deep-sea riser and the transition pipe is denoted as B, so A = B.

[0014] Furthermore, the lower end of the guide pipe is close to the closed end of the flexible joint of the deep-sea riser.

[0015] Furthermore, the flow guide tube is parallel to the internal heating tube, and the distance between the multiple internal heating tubes and the flow guide tube is equal.

[0016] Furthermore, it also includes a heating tube fixing plate, with the guide tube and all internal heating tubes passing through the corresponding through holes on the heating tube fixing plate, and the internal heating tubes and the guide tubes being fixed together by the heating tube fixing plate.

[0017] Furthermore, the internal heating tube, the guide tube, and the heating tube fixing plate are all located inside the cavity of the marine deep-water riser flexible joint, and are all immersed in the liquid medium inside the cavity of the marine deep-water riser flexible joint during high-temperature performance testing.

[0018] Furthermore, the internal heating pipe provides a heat source to heat the liquid medium inside the flexible joint of the deep-sea riser; the guide pipe guides the liquid medium to circulate under the action of the high-temperature pump, avoiding the formation of a large temperature gradient and ensuring the temperature consistency of the entire flexible joint of the deep-sea riser.

[0019] Furthermore, when the liquid medium flows into the external container through the outlet pipe, the flow rate is determined by the height of the liquid level, and it increases as the height of the liquid level increases.

[0020] Furthermore, it also includes a temperature sensor, installed on the flexible joint of the deep-sea riser, used to measure the temperature of the coolant in the flexible joint itself, characterizing the working environment temperature of the flexible joint.

[0021] Furthermore, the external heating device serves as an auxiliary heating device, providing a heat source to maintain a constant temperature for the circulating liquid medium; the internal heating device, composed of internal heating tubes, serves as the main heating device, ensuring that the liquid medium in the inner cavity of the flexible joint of the deep-sea riser has a stable and continuous heat source.

[0022] The advantages of this invention compared to the prior art are:

[0023] (1) This invention employs two heating systems to maintain a constant temperature of the liquid medium in the external circulation and to maintain the temperature of the liquid medium inside the cavity in the internal circulation, thereby significantly reducing the ineffective heat loss during the experiment. At the same time, the experimental device provides a power source for heating the liquid medium through a high-temperature pump, promotes the fluidity of the heated liquid medium, and ensures the uniformity of the temperature of the heated liquid medium as much as possible, effectively reducing experimental errors;

[0024] (2) The present invention provides a test device for high-temperature performance with high energy utilization and uniform heat source, which effectively reduces the test scale, improves test efficiency, reduces test error and improves test accuracy.

[0025] (3) In the test apparatus, the present invention improves the fluidity of the high-temperature medium by designing the flow guide hole, reduces the temperature difference inside the test product, and improves the test accuracy.

[0026] (4) This invention can be extended to the performance testing of similar pipe structures under high temperature conditions. Attached Figure Description

[0027] Figure 1 Schematic diagram of the experimental apparatus layout of this invention;

[0028] Figure 2 A partial schematic diagram of the experimental apparatus of this invention. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, the present invention proposes a high-efficiency and accurate high-temperature performance testing device for flexible joints of deep-sea risers, comprising: an external heating device 1, a liquid medium 2, an inlet pipe 3, a high-temperature pump 4, an outlet pipe 5, a guide pipe 6, an inlet sensor 7, an internal heating pipe 8, an upper end cover 9, a transition pipe 10, and an inner pipe sensor 11.

[0031] One end of the flexible joint of the deep-sea riser is closed, and the bottom of the transition pipe 10 is sealed and connected to the other end of the flexible joint of the deep-sea riser. The top of the transition pipe 10 is fixedly installed with an upper end cap 9. A through hole is opened on the side wall of the transition pipe 10 and an outlet pipe 5 is installed. The outlet pipe 5 is connected to an external container, so that the inner cavity of the transition pipe 10 is connected to the external container.

[0032] The guide pipe 6 is coaxially arranged in the inner cavity of the flexible joint of the deep-sea riser. The upper end of the guide pipe 6 is fixed on the upper end cover 9. Multiple guide holes 14 are evenly distributed on the side wall of the guide pipe 6. Multiple internal heating pipes 8 are evenly distributed around the guide pipe 6. The upper end of the internal heating pipe 8 is also fixed on the upper end cover 9.

[0033] The outer container contains liquid medium 2. Under the action of the high-temperature pump 4, the liquid medium 2 enters the guide pipe 6 through the inlet pipe 3 and flows from the lower port of the guide pipe 6 and the guide hole 14 into the inner cavity of the flexible joint of the deep-sea riser. When the liquid medium 2 rises to the outlet pipe 5, the liquid medium 2 flows into the outer container through the outlet pipe 5. The liquid medium 2 enters the inner cavity of the flexible joint of the deep-sea riser through the high-temperature pump 4 and flows out through the outlet pipe 5 to form a flow balance.

[0034] An external heating device 1 is installed close to the bottom of the outer container. The power of the external heating device 1 is controlled by the temperature information fed back by the inlet sensor 7 located at the inlet of the guide pipe 6, so as to form a relative temperature balance in the external circulation and provide a constant temperature liquid medium 2.

[0035] Based on the liquid medium temperature information fed back by the two inner tube sensors 11 located at the upper and lower joints of the marine deep-water riser flexible joint, the power of the internal heating tube 8 is controlled so that the liquid medium temperature in the inner cavity of the marine deep-water riser flexible joint remains relatively constant.

[0036] Preferably, the transition pipe 10 extends the inner cavity of the flexible joint of the deep-sea riser. The inner diameter of the transition pipe 10 is denoted as A, and the inner diameter of the connection between the flexible joint of the deep-sea riser and the transition pipe 10 is denoted as B, where A = B.

[0037] Preferably, the lower end of the guide pipe 6 is close to the closed end of the flexible joint of the deep-sea riser.

[0038] Preferably, the guide tube 6 is parallel to the internal heating tube 8, and the distance between the multiple internal heating tubes 8 and the guide tube 6 is equal.

[0039] Furthermore, the device of the present invention also includes a heating tube fixing plate 13, through which the guide tube 6 and all internal heating tubes 8 pass via through holes at corresponding positions on the heating tube fixing plate 13, and the internal heating tubes 8 and the guide tube 6 are fixed together by the heating tube fixing plate 13, as shown. Figure 2 As shown.

[0040] The internal heating pipe 8, the guide pipe 6, and the heating pipe fixing plate 13 are all located inside the cavity of the flexible joint of the deep-sea riser. During high-temperature performance testing, they are all immersed in the liquid medium 2 inside the cavity of the flexible joint. The internal heating pipe 8 provides a heat source to heat the liquid medium inside the cavity of the flexible joint. The guide pipe 6, under the action of the high-temperature pump 4, guides the liquid medium 2 to circulate, avoiding the formation of a large temperature gradient and ensuring the uniformity of temperature throughout the cavity of the flexible joint. When the liquid medium 2 flows into the external container through the outlet pipe 5, the flow rate is determined by the liquid level of the liquid medium 2, and increases with the increase of the liquid level.

[0041] The external heating device 1 serves as an auxiliary heating device, providing a heat source to maintain the constant temperature of the circulating liquid medium 2; the internal heating device, consisting of the internal heating tube 8, serves as the main heating device, ensuring that the liquid medium 2 in the inner cavity of the flexible joint of the deep-sea riser has a stable and continuous heat source.

[0042] Furthermore, the device of the present invention also includes a temperature sensor 12, which is installed on the flexible joint and is used to measure the temperature of the coolant inside the flexible joint itself, that is, the working environment temperature of the flexible joint, which is the main test target parameter of the test.

[0043] Example 1:

[0044] like Figures 1-2As shown in the figure, this embodiment provides a high-efficiency and accurate high-temperature performance testing device for flexible joints of deep-sea risers, which mainly includes: an external heating device 1, a liquid medium 2, an inlet pipe 3, a high-temperature pump 4, an outlet pipe 5, a guide pipe 6, an inlet sensor 7, an internal heating pipe 8, an upper end cover 9, a transition pipe 10, an inner pipe sensor 11, a temperature sensor 12, a heating pipe fixing plate 13, and a guide hole 14.

[0045] Multiple guide holes 14 are evenly distributed along the axial and circumferential directions on the guide tube 6. The guide tube 6 is fixed to the upper end cap 9. Internal heating tubes 8 are evenly distributed around the guide tube 6 and are fixed to the guide tube 6 by a heating tube fixing plate 13. The internal heating tubes 8, the guide tube 6, and the heating tube fixing plate 13 are all immersed in the liquid medium 2 inside the inner cavity of the test product. The internal heating tubes 8 provide a heat source to heat the liquid medium 2. Under the action of the high-temperature pump 4, the guide tube 6 guides the liquid medium 2 to circulate, avoiding the formation of a large temperature gradient and ensuring the uniformity of the temperature inside the entire inner cavity of the test product.

[0046] The power of the external heating device 1 is controlled by the temperature information fed back by the inlet sensor 7, forming a relative temperature balance in the external circulation. Under the action of the high-temperature pump 4, the liquid medium 2 enters the guide pipe 6 through the inlet pipe 3, and flows into the inner cavity of the test product from the port of the guide pipe 6 and the guide hole 14. When the liquid medium 2 rises to the outlet pipe 5, it flows into the external container through the outlet pipe 5. The flow rate is determined by the liquid level of the liquid medium 2, and it increases with the increase of the liquid level. The liquid medium 2 enters through the high-temperature pump 4 and flows out through the outlet pipe 5, forming a flow balance.

[0047] Two heating devices are used. The external heating device mainly provides a heat source to keep the circulating liquid medium 2 at a constant temperature, serving as an auxiliary heating device. The internal heating device, consisting of internal heating tubes 8, serves as the main heating device, ensuring that the liquid medium 2 inside the test product has a stable and continuous heat source. The internal heating tubes 8 are surrounded by the liquid medium 2, resulting in low heat loss and high energy utilization.

[0048] Example 2:

[0049] The power input of the external heating device 1 is controlled based on the temperature information fed back by the inlet sensor 7, providing a relatively constant temperature liquid medium 2. This liquid medium 2 enters the guide pipe 6 through the inlet pipe 3 via the high-temperature pump 4, and then enters the inner cavity of the test product. The power of the internal heating pipe 8 is controlled based on the temperature information fed back by the upper and lower inner pipe sensors 11, so that the temperature outside the guide pipe 6 and inside the test product remains relatively constant. Through the guide hole 14 and the port outlet on the guide pipe 6, the liquid medium 2 inside the test product circulates, promoting heat exchange within the liquid medium 2 inside the test product cavities, ensuring a small internal temperature difference, and improving the accuracy of the test.

[0050] Initially, the experiment used a traditional direct heating method with a hot liquid medium. The 3000kW heat source failed to reach the required temperature, and the temperature difference between the upper and lower inner tube sensors was nearly 70°C, hindering the experiment's progress. Using the heating scheme of this invention, the required heat source power for temperature equilibrium was approximately 2200kW, and the temperature difference between the upper and lower inner tube sensors was within 15°C, allowing the experiment to proceed smoothly. This invention reduces heat loss in the heating device, improves energy utilization, and reduces the temperature gradient in high-temperature experiments, thereby reducing experimental errors and improving test accuracy.

[0051] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A high-efficiency and precise high-temperature performance test device for a flexible joint of a deepwater riser of an offshore platform, characterized in that, The application relates to a heating device for a deepwater riser flexible joint. One end of the deepwater riser flexible joint is closed, the bottom of a transition pipe (10) is sealingly connected to the other end of the deepwater riser flexible joint, and the top of the transition pipe (10) is fixedly installed with an upper end cover (9); a through hole is formed in the side wall of the transition pipe (10) and an outlet pipe (5) is installed, the outlet pipe (5) is connected to an external container, and the inner cavity of the transition pipe (10) is communicated with the external container. A flow guide pipe (6) is arranged in the inner cavity of the deepwater riser flexible joint and coaxially arranged with the deepwater riser flexible joint, the upper end of the flow guide pipe (6) is fixed on the upper end cover (9), a plurality of flow guide holes (14) are uniformly arranged on the side wall of the flow guide pipe (6), a plurality of internal heating pipes (8) are uniformly arranged on the circumferential periphery of the flow guide pipe (6), and the upper ends of the internal heating pipes (8) are also fixed on the upper end cover (9). A liquid medium (2) is arranged in the external container, under the action of a high-temperature pump (4), the liquid medium (2) enters the flow guide pipe (6) through an inlet pipe (3), flows into the inner cavity of the deepwater riser flexible joint from the lower end of the flow guide pipe (6) and the flow guide holes (14), when the liquid medium (2) rises to the outlet pipe (5), the liquid medium (2) flows into the external container through the outlet pipe (5), the liquid medium (2) enters the inner cavity of the deepwater riser flexible joint through the high-temperature pump (4) and flows out through the outlet pipe (5), and a flow balance is formed. An external heating device (1) is arranged close to the bottom of the external container, the power of the external heating device (1) is controlled according to temperature information fed back by an inlet sensor (7) arranged at the inlet of the flow guide pipe (6), a relative temperature balance of external circulation is formed, and a constant-temperature liquid medium (2) is provided. The power of the internal heating pipes (8) is controlled according to liquid medium temperature information of corresponding positions fed back by two inner pipe sensors (11) arranged at the upper and lower end connectors of the deepwater riser flexible joint, and the temperature of the liquid medium in the inner cavity of the deepwater riser flexible joint is kept relatively constant. The transition pipe (10) prolongs the inner cavity of the deepwater riser flexible joint, the inner cavity diameter of the transition pipe (10) is denoted as A, the inner cavity diameter of the connection part between the deepwater riser flexible joint and the transition pipe (10) is denoted as B, and A=B.

2. The high-temperature performance test device for a flexible joint of a deepwater marine riser according to claim 1, characterized in that: The lower end of the flow guide pipe (6) is close to the closed end of the deepwater riser flexible joint.

3. The high-temperature performance test device for a flexible joint of a deepwater marine riser according to claim 1, characterized in that: The flow guide pipe (6) is parallel to the internal heating pipes (8), and the spacing between the plurality of internal heating pipes (8) and the flow guide pipe (6) is equal.

4. The high-temperature performance test device for a flexible joint of a deepwater marine riser according to claim 1, characterized in that: A heating pipe fixing disc (13) is further arranged, the flow guide pipe (6) and all the internal heating pipes (8) pass through the through holes of the corresponding positions of the heating pipe fixing disc (13), and the internal heating pipes (8) and the flow guide pipe (6) are fixed through the heating pipe fixing disc (13).

5. The high efficient and precise high temperature performance test device for flexible joint of deepwater marine riser according to any one of claims 1-4, characterized in that: ​ 6. The high efficient and precise high temperature performance test device for flexible joint of deepwater marine riser according to claim 4, characterized in that: The internal heating pipe (8), the flow guide pipe (6) and the heating pipe fixing disc (13) are located in the inner cavity of the flexible joint of the deepwater marine riser, and are immersed in the liquid medium (2) in the inner cavity of the flexible joint of the deepwater marine riser when the high-temperature performance test is carried out.

7. The high efficient and precise high temperature performance test device for flexible joint of deepwater marine riser according to claim 6, characterized in that: The internal heating pipe (8) provides a heat source for heating the liquid medium in the inner cavity of the flexible joint of the deepwater marine riser; the flow guide pipe (6) guides the circulating flow of the liquid medium (2) under the action of the high-temperature pump (4), so as to avoid the formation of a large temperature gradient and ensure the consistency of the temperature of the entire inner cavity of the flexible joint of the deepwater marine riser.

8. The high efficient and precise high temperature performance test device for flexible joint of deepwater marine riser according to claim 6, characterized in that: When the liquid medium (2) flows into the external container through the outlet pipe (5), the flow rate is determined by the liquid level of the liquid medium (2) and increases with the increase of the liquid level.

9. The high-temperature performance test device for a flexible joint of a deepwater marine riser according to claim 1, characterized in that: The temperature measuring sensor (12) is installed on the flexible joint of the deepwater marine riser and is used for measuring the temperature of the cooling liquid of the flexible joint and representing the working environment temperature of the flexible joint.

10. The high-efficiency and precise high-temperature performance test device for a flexible joint of a deepwater marine riser according to claim 1, characterized in that: The external heating device (1) serves as an auxiliary heating device and provides a heat source for maintaining the constant temperature of the circulating liquid medium (2); and the internal heating device composed of the internal heating pipe (8) serves as a main heating device and ensures that the liquid medium (2) in the inner cavity of the flexible joint of the deepwater marine riser has a stable and continuous heat source.

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