A self-sinking insertion type subsea pipeline into mud leakage test device

Abstract

The application discloses a self-sinking insertion type seabed pipeline into mud leakage test device, which comprises a mud surface base disc part, a shunt and control part, and an into-mud and leakage hole part; the mud surface base disc part provides support for the shunt and control part and the into-mud and leakage hole part, the shunt and control part provides fluid connection, shunt and remote control functions, and the into-mud and leakage hole part provides into-mud construction and mud-under-leakage hole simulation functions. The device uses remote control underwater device, uses the high-pressure cutting principle of jet flow and the self-sinking principle to realize into-mud construction, and is simple and easy to operate. The device can simulate the leakage position of the real seabed pipeline by setting the aperture size and position of the leakage pipe and the base disc nozzle, and is multifunctional. The device is simple in offshore construction, and the water surface in the into-mud state is visible and controllable, and the device can be repeatedly used and can simulate various different leakage conditions with one device, so that the seabed pipeline leakage research is facilitated.

Description

Technical Field

[0001] This invention relates to the field of marine oil and gas resource extraction technology, specifically to a self-sinking insertion type subsea pipeline mud leakage test device. Background Technology

[0002] Oil and gas gathering and transportation is a crucial part of offshore oil and gas development and serves as the "lifeline" of offshore oil and gas production systems. Damage to subsea pipelines can lead to oil and gas leaks and serious consequences. Not only will the normal production of offshore oil and gas fields be affected, causing huge economic losses, but more seriously, oil and gas leaks will also cause severe pollution to the marine environment, damage the marine ecosystem, and generate adverse social impacts.

[0003] Studying the leakage behavior of subsea pipelines requires experiments, but offshore testing is complex and costly. Therefore, it is particularly important to develop a testing device that meets the requirements of subsea pipeline leakage scenarios while also being easy to construct, controllable in construction, and reusable. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention discloses a self-diving insertion-type subsea pipeline mud leakage test device. To achieve the above objectives, this invention adopts the following technical solution:

[0005] A self-sinking, insertion-type subsea pipeline mud leakage test device includes a mud surface base plate component, a diversion and control component, and a mud entry and leakage hole component. The mud surface base plate component provides support for the diversion and control component and the mud entry and leakage hole component. The diversion and control component provides fluid connection, diversion, and remote control functions. The mud entry and leakage hole component provides mud entry construction and mud leakage hole simulation functions.

[0006] As an improvement, the mud-surface base plate component includes: a disc base, an extended support plate, a support angle steel, a lifting ring, a depth gauge, an underwater tilt sensor, and a nozzle. One end of the extended support plate is fixedly connected to the disc base, and the other end extends to the outside of the disc base. One end of the support angle steel is fixedly connected to the disc base, and the other end extends to the outside of the disc base. The lifting ring and the depth gauge are located at the end of the support angle steel. The underwater tilt sensor is located on the disc base. The nozzle is located on the outer edge of the disc base, with its opening facing the outside of the disc base.

[0007] As an improvement, the mud inlet and leakage hole component includes a fixed pad, a sinking pipe, and a leakage pipe. The fixed pad is located at the center of the disc base. The sinking pipe passes through the center of the fixed pad and extends downward. There are multiple leakage pipes, which are arranged around the sinking pipe. Both the leakage pipe and the sinking pipe are provided with leakage holes.

[0008] As an improvement, the diversion and control component includes: a diversion busbar, a fixing buckle, an underwater four-way connector, and a connecting hose. The fixing buckle fixes the diversion busbar on the disc base. The underwater four-way connector is connected to a high-pressure hose and then to the diversion busbar. The diversion busbar is provided with diversion holes, which are respectively connected to the leakage pipe, the sinking pipe, and the nozzle through the connecting hose.

[0009] As an improvement, deep-water solenoid valves are respectively installed on the connecting hoses that connect the diverter to the leakage pipe, the sinking pipe, and the nozzle.

[0010] As an improvement, the diameter and shape of the leak holes on each of the aforementioned leak pipes are different, and the height of the leak holes is also different.

[0011] As an improvement, a pressure transmitter is provided on the underwater four-way valve.

[0012] As an improvement, the deep-water solenoid valve, pressure transmitter, underwater tilt sensor, and depth gauge are all externally connected to cables, and the disc base is equipped with a cable junction box.

[0013] As an improvement, the main body of the test device is made of stainless steel.

[0014] The present invention has the following advantages:

[0015] This device employs a remotely controlled underwater system, utilizing the high-pressure cutting principle of jet streams and the principle of gravity-based sinking to penetrate the mud for construction, making it simple and easy to implement. By setting the orifice size and position of the leak pipe and base plate nozzles, it simulates the leak location of a real subsea pipeline, achieving multi-functionality with a single device.

[0016] This invention is easy to construct at sea, the water surface is visible and controllable when it is submerged in mud, it can be reused, and a single device can simulate multiple different leakage scenarios, which facilitates the study of submarine pipeline leaks. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a self-sinking insertion type subsea pipeline mud leakage test device in Example 1;

[0018] Figure 2 This is a top view of a self-sinking insertion type subsea pipeline mud leakage test device in Example 1;

[0019] Figure 3 This is a structural diagram of the fixed pad in a self-sinking insertion type submarine pipeline mud leakage test device in Example 1;

[0020] Figure 4 This is a diagram showing the working state of a self-sinking insertion type submarine pipeline mud leakage test device in Example 1.

[0021] The diagram indicates:

[0022] 1-Mud surface base plate component, 11-Disc base, 12-Extended support plate, 13-Support angle steel, 14-Lifting ring, 15-Depth gauge, 16-Underwater tilt sensor, 17-Nozzle, 18-Cable junction box, 2-Diverter and control component, 21-Diverter, 22-Fixing buckle, 23-Underwater four-way connector, 231-Pressure transmitter, 24-Connecting hose, 3-Mud entry and leakage hole component, 31-Fixing pad, 32-Submersible pipe, 33-Leakage pipe, 331-Leakage hole, 4-High pressure hose, 5-Deep water solenoid valve, 6-Sling, 7-Boat, 71-Water surface, 72-Mud surface. Detailed Implementation

[0023] The present invention will now be described in detail and specifically through specific embodiments to enable a better understanding of the invention. However, the following embodiments do not limit the scope of protection of the present invention.

[0024] Example 1

[0025] This embodiment discloses a self-sinking, insertion-type subsea pipeline mud leakage test device, including a mud surface base plate component 1, a diversion and control component 2, and a mud entry and leakage hole component 3. The mud surface base plate component 1 provides support for the diversion and control component 2 and the mud entry and leakage hole component 3; the diversion and control component 2 provides fluid connection, diversion, and remote control functions; the mud entry and leakage hole component 3 provides mud entry construction and mud leakage hole simulation functions.

[0026] The mud-surface base component 1 includes: a disc base 11, an extended support plate 12, a support angle steel 13, a lifting ring 14, a depth gauge 15, an underwater tilt sensor 16, and nozzles 17. One end of the extended support plate 12 is fixedly connected to the disc base 1, and the other end extends outward to the outside of the disc base 1. One end of the support angle steel 13 is fixedly connected to the disc base 1, and the other end extends outward to the outside of the disc base 1. In this embodiment, there are four extended support plates 12 and four support angle steels 13. The lifting ring 14 and the depth gauge 15 are located at the ends of the support angle steel 13. The underwater tilt sensor 16 is located on the disc base 1. There are four nozzles 17 arranged in a circumferential array along the outer edge of the disc base 1, with their openings facing outwards from the disc base 1.

[0027] The mud inlet and leakage component 3 includes a fixed pad 31, a sinking pipe 32, and a leakage pipe 33. The fixed pad 31 is located at the center of the disc base 1, and the sinking pipe 32 passes through the center of the fixed pad 31 and extends downwards for 2.2m. In this embodiment, there are 6 leakage pipes 33 (numbered AF in the figure), which are arranged around the sinking pipe. Among them, leakage pipes A and B extend downwards for 1.015m, and leakage pipe CF extends downwards for 2.015m. Each leakage pipe 33 is provided with a leakage hole 331, and the number of the leakage hole 331 corresponds to the number of the leakage pipe 33. Leakage holes A and B are located 1m below the disc base 11, and leakage holes CF are located 2m below the disc base 11. The diameter and shape of leakage holes AF are different. A leakage hole 331 is also provided at the end of the sinking pipe 32, which is numbered G.

[0028] The diversion and control component 2 includes: a diversion manifold 21, a fixing buckle 22, an underwater four-way connector 23, and a connecting hose 24. The fixing buckle 22 secures the diversion manifold 21 to the disc base 11. The underwater four-way connector 23 is externally connected to a high-pressure hose 4 and then connected to the diversion manifold 21. The diversion manifold 21 has diversion holes, which are connected to each leakage pipe 33, sink pipe 32, and nozzle 17 via the connecting hose 24. Each connecting hose 24 is equipped with a deep-water solenoid valve 5. The underwater four-way connector 23 is equipped with a pressure transmitter 231 to control the pressure in each pipeline downstream of the underwater four-way connector 23.

[0029] In this embodiment, cables are externally connected to the deep-water solenoid valve 5, pressure transmitter 231, underwater tilt sensor 16, and depth gauge 15. A cable junction box 18 is provided on the disc base 11. The deep-water solenoid valve 5 is also numbered, with the number corresponding to the AF leakage pipe 33, the number G controlling the submersible pipe 32, and the solenoid valves controlling the leakage of the nozzle 17 numbered 1#-4#. Given the repeated use in seawater, stainless steel is used for all components to reduce seawater corrosion. Special treatment is required for the connections and cable wiring of the above components to ensure high pressure, watertightness, and no air or liquid leakage.

[0030] The usage method of this embodiment is as follows:

[0031] On the ship, the depth gauge 15, underwater tilt sensor 16, pressure transmitter 231, lifting ring 14, and sling 6 are installed and fixed, and the relevant signals are adjusted. The attitude and flatness are finely adjusted according to the length of the sling 6. The high-pressure soft tube 4 is connected to the high-pressure air source on the water surface.

[0032] A crane lowers the device to the seabed, and two depth gauges 15 and an underwater tilt sensor 16 determine the device's attitude and depth in the water. After the device reaches the seabed, it sinks autonomously under its own weight, with the sinking pipe 32 and the leakage pipe 33 first inserted into the soil, and the tilt angle of the surface monitoring device is less than 10 degrees.

[0033] Adjust the gas source pressure. When the underwater pressure transmitter reaches the preset value, open the G-type deep-water solenoid valve. Gas is ejected through the diverter 21, underwater four-way valve 23, connecting hose 24, G-type deep-water solenoid valve 5, submerged pipe 32, and G-type leak hole 331. The soil under the submerged pipe 32 is loosened by the airflow, and the device slowly sinks under its own weight.

[0034] If the tilt angle of the surface signal display device exceeds 10 degrees during the sinking process, pause the spraying, close the G-type deep-water solenoid valve 5, and use a crane to lift the device upwards. Resume the spraying and sinking operation once the tilt angle returns to 10 degrees. If the device fails to sink, release the gas from the high-pressure hose 4, switch to an electric submersible pump on the water surface, inject water through the electric submersible pump, open deep-water solenoid valves 5 (1-4), and drain water through nozzle 17 until all gas is expelled from the passage. Then close the deep-water solenoid valve 5. Connect the high-pressure hose 4 to high-pressure gas, turn on the gas source, and observe the pressure transmitter reading. When the preset pressure value is reached, open the G-type deep-water solenoid valve 5, using high-pressure gas to push high-pressure water through the G-type leak hole 331, creating cutting water force that impacts the underlying soil, thus sinking the device.

[0035] Once the device has entered the mud to the predetermined depth, close deep-water solenoid valve G5. Prepare for a marine leakage simulation test.

[0036] The air source pressure at the water surface is stabilized according to the set pressure conditions (1-10 MPa). Pipeline leakage simulations can be achieved at different locations (above mud, 1 meter below mud, 2 meters below mud) and with different orifice diameters by installing and controlling valves 1#-4# and AF# deep-water solenoid valve 5.

[0037] This device employs a remotely controlled underwater system, utilizing the high-pressure cutting principle of jet streams and the principle of gravity-based sinking to penetrate the mud for construction, making it simple and easy to implement. By setting the orifice size and position of the leak pipe and base plate nozzles, it simulates the leak location of a real subsea pipeline, achieving multi-functionality with a single device.

[0038] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A self-sinking insertion-type subsea pipeline mud leakage test device, characterized in that, It includes a mud-surface base plate component, a diversion and control component, and a mud-entry and leakage hole component. The mud-surface base plate component provides support for the diversion and control component and the mud-entry and leakage hole component. The diversion and control component provides fluid connection, diversion, and remote control functions. The mud-entry and leakage hole component provides mud-entry construction and mud-underground leakage hole simulation functions. By setting the orifice size and position of the leakage pipe and base plate nozzle, the leakage location of a real subsea pipeline can be simulated. The mud-surface base plate component includes: a disc base, an extended support plate, a support angle steel, a lifting ring, a depth gauge, an underwater tilt sensor, and a nozzle. One end of the extended support plate is fixedly connected to the disc base, and the other end extends to the outside of the disc base. One end of the support angle steel is fixedly connected to the disc base, and the other end extends to the outside of the disc base. The lifting ring and depth gauge are located at the end of the support angle steel. The underwater tilt sensor is located on the disc base. The nozzle is located on the outer edge of the disc base, with its opening facing the outside of the disc base. The mud inlet and leakage hole component includes a fixed pad, a sinking pipe, and a leakage pipe. The fixed pad is located at the center of the disc base. The sinking pipe passes through the center of the fixed pad and extends downward. There are multiple leakage pipes, which are arranged around the sinking pipe. Both the leakage pipe and the sinking pipe are provided with leakage holes. The diversion and control component includes: a diversion bar, a fixing buckle, an underwater four-way connector, and a connecting hose. The fixing buckle fixes the diversion bar on the disc base. The underwater four-way connector is connected to a high-pressure hose and then to the diversion bar. The diversion bar is provided with diversion holes, which are respectively connected to the leakage pipe, the sinking pipe, and the nozzle through the connecting hose. The connecting hoses that connect the diverter to the leakage pipe, the submerged pipe, and the nozzle are each equipped with a deep-water solenoid valve; the deep-water solenoid valve that controls the submerged pipe is a No. G deep-water solenoid valve. The crane lowers the device to the seabed, and the underwater attitude and depth of the device are determined by two depth gauges and an underwater tilt sensor. After the device reaches the seabed, it sinks autonomously by its own weight. The sinking pipe and the leakage pipe are first inserted into the soil. The attitude and tilt angle of the water surface monitoring device is less than 10 degrees. Adjust the gas source pressure. When the underwater pressure transmitter reaches the preset value, open the G-type deep-water solenoid valve. Gas will be ejected through the distributor, underwater four-way valve, connecting hose, G-type deep-water solenoid valve, submerged pipe, and G-type leak hole. The soil under the submerged pipe will be loosened by the airflow, and the device will slowly sink by its own weight. After the device enters the mud to the predetermined depth, close the G-type deep-water solenoid valve. The marine leakage simulation test can then be prepared.

2. The self-sinking insertion type subsea pipeline mud leakage test device according to claim 1, characterized in that, The diameter and shape of the leak holes on each of the aforementioned leak pipes are different, and the height of the leak holes is also different.

3. The self-sinking insertion type subsea pipeline mud leakage test device according to claim 1, characterized in that, A pressure transmitter is installed on the underwater four-way valve.

4. The self-sinking insertion type subsea pipeline mud leakage test device according to claim 1, characterized in that, The deep-water solenoid valve, pressure transmitter, underwater tilt sensor, and depth gauge are all externally connected to cables, and the disc base is equipped with a cable junction box.

5. The self-sinking insertion type subsea pipeline mud leakage test device according to claim 1, characterized in that, The main body of the experimental device is made of stainless steel.

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