Experimental monitoring device for simulating top and under-scale corrosion of submarine oil and gas pipeline

Abstract

The invention relates to an experimental monitoring device for simulating seabed oil and gas pipeline top and under-scale corrosion. The experimental monitoring device comprises a container, a cover body, a first temperature adjusting assembly, a second temperature adjusting assembly, a gas assembly, a first detection unit and a second detection unit. Wherein the cover body is provided with a contact surface, and the contact surface forms an upper sealing surface of the container. The first temperature adjusting assembly is used for adjusting the temperature of the cover body, and the second temperature adjusting assembly is used for adjusting the temperature of the container. The first detection unit is arranged on the contact surface and used for detecting the corrosion condition of the contact surface. The second detection unit is arranged at the bottom of the container and used for detecting the corrosion condition of the bottom of the container. The actual operation conditions of the marine oil and gas pipeline in different environments can be simulated through the first temperature adjusting assembly and the second temperature adjusting assembly, the local corrosion conditions of top corrosion and under-scale corrosion can be continuously monitored through the tow electrodes at the top end and the bottom of the container, corrosion information is fed back in real time, and early warning and evaluation are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion monitoring, and in particular to an experimental monitoring device for simulating corrosion on the top and under-scale of a submarine oil and gas pipeline. Background Art

[0002] As the development scale of offshore oil and gas fields and deepwater gas fields gradually expands, the service environment of marine oil and gas pipelines is becoming increasingly harsh. The medium transported in the pipeline is highly corrosive and often causes serious corrosion damage to the inner wall of the pipeline, and the safety risks faced are also increasing. Therefore, during the service of marine oil and gas pipelines, it is necessary to monitor the corrosion of the pipeline in real time to ensure the safe operation of the oil and gas pipelines.

[0003] The corrosion problem of the inner wall of the pipeline is an important factor affecting the safety of the pipeline. When there is a large temperature difference between the medium transported inside the pipeline and the environment outside the pipeline, the hot and humid steam inside the pipeline will condense at the top of the pipeline. At the same time, the volatile media such as carbon dioxide, hydrogen sulfide, and organic acids transported inside the pipeline will dissolve in the condensate, thereby inducing serious top corrosion problems; solid particles at the bottom of the pipeline will cause serious under-scale corrosion problems. In order to facilitate the determination of appropriate corrosion control plans and achieve early warning and protection against top corrosion and under-scale corrosion, effective methods are needed to accurately perceive the dynamic development process of corrosion. Summary of the invention

[0004] In view of the above technical problems, the present invention provides an experimental monitoring device for simulating the top and under-scale corrosion of submarine oil and gas pipelines, which can monitor the development of top corrosion and under-scale corrosion in real time and obtain local corrosion information in different environments and at different locations.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An experimental monitoring device for simulating corrosion on the top and under-scale of a submarine oil and gas pipeline, comprising:

[0007] Container to hold the experimental liquid;

[0008] A cover body, the cover body is detachably sealed to the opening of the container, the cover body has a contact surface, and the contact surface constitutes an upper sealing surface of the container;

[0009] a first temperature regulating component, the first temperature regulating component being arranged on the cover body and being used for regulating the temperature of the cover body;

[0010] A second temperature regulating component, which is sleeved on the outside of the container and is used to regulate the temperature of the container;

[0011] A gas assembly, the gas assembly comprising an air inlet pipe and an exhaust pipe, the air inlet pipe and the exhaust pipe are both sealed and penetrated on the cover body, one end of the air inlet pipe extends toward the bottom of the container, and one end of the exhaust pipe is located at the opening of the container;

[0012] A first detection unit, the first detection unit is arranged on the contact surface and is used to detect corrosion conditions of the contact surface; and

[0013] The second detection unit is arranged at the bottom of the container to detect the corrosion condition of the bottom of the container.

[0014] In one embodiment, the first temperature adjustment component includes a temperature controlled chamber;

[0015] The temperature control chamber is opened inside the cover body, and the bottom of the temperature control chamber is the contact surface; the temperature control chamber is provided with a liquid inlet and a liquid outlet for connecting to an external water cooling circulation device.

[0016] In one embodiment, the second temperature regulating component includes a heating plate, and the heating plate is sleeved in the side wall interlayer of the container.

[0017] In one embodiment, the second temperature regulating component further includes a heat-insulating layer, and the heat-insulating layer is sleeved on the outside of the container.

[0018] In one embodiment, a first temperature sensor is disposed on the contact surface to monitor the temperature of the contact surface.

[0019] In one embodiment, a second temperature sensor is suspended on the cover, and the second temperature sensor is located in the upper half of the container to monitor the gas temperature inside the container.

[0020] In one embodiment, a third temperature sensor is suspended on the cover, and the third temperature sensor is located in the lower half of the container to monitor the temperature of the liquid inside the container.

[0021] In one embodiment, a reference electrode is suspended on the cover, and the reference electrode is located in the lower half of the container.

[0022] In one embodiment, a contrast electrode is suspended on the cover, and the contrast electrode is located in the lower half of the container.

[0023] In one embodiment, the cover is further provided with a liquid inlet pipe, and the bottom of the container is provided with a liquid discharge pipe.

[0024] The present invention adopts the above technical solution, which has the following advantages:

[0025] The present invention can simulate the actual operation conditions of marine oil and gas pipelines under different environments through the first temperature adjustment component and the second temperature adjustment component, and can continuously monitor the local corrosion conditions of top corrosion and under-deposit corrosion through the wire beam electrodes at the top and bottom of the container, and provide real-time feedback of corrosion information for early warning evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the principle structure of an experimental monitoring device in one embodiment of the present invention;

[0027] Figure 2 This is a schematic plan view of a wire bundle electrode in one embodiment of the present invention;

[0028] Reference numerals:

[0029] 1. Cover; 2. Container; 3. First detection unit; 4. Temperature control chamber; 5. First temperature sensor; 6. Second temperature sensor; 7. Third temperature sensor; 8. Reference electrode; 9. Comparison electrode; 10. Air inlet pipe; 11. Exhaust pipe; 12. Liquid inlet pipe; 13. Liquid discharge pipe; 14. Heating plate; 15. Insulation layer. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0031] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0032] The corrosion problem of the inner wall of the pipeline is an important factor affecting the safety of the pipeline. When there is a large temperature difference between the medium transported inside the pipeline and the environment outside the pipeline, the hot and humid steam inside the pipeline will condense at the top of the pipeline. At the same time, volatile media such as carbon dioxide, hydrogen sulfide, and organic acids transported inside the pipeline dissolve in the condensate, thereby inducing serious top corrosion problems; solid particles at the bottom of the pipeline will cause serious under-scale corrosion problems. In order to facilitate the determination of a suitable corrosion control plan and achieve early warning and protection of top corrosion and under-scale corrosion, an effective method is needed to accurately perceive the dynamic development process of corrosion. In response to the above technical problems, the present invention provides an experimental monitoring device that simulates the top and under-scale corrosion of submarine oil and gas pipelines, which can monitor the development of top corrosion and under-scale corrosion in real time, and obtain local corrosion information in different environments and at different locations. The technical solution of the present invention is described in detail below in conjunction with specific examples.

[0033] Reference Figure 1 As shown, the experimental monitoring device for simulating the top and under-scale corrosion of submarine oil and gas pipelines according to the present invention comprises a container 2, a cover 1, a first temperature adjustment component, a second temperature adjustment component, a gas component, a first detection unit 3 and a second detection unit. The container 2 is used to contain the experimental liquid, the cover 1 is detachably sealed with the opening of the container 2, and the cover 1 has a contact surface, which constitutes the upper sealing surface of the container 2.

[0034] The first temperature regulating component is disposed on the cover body 1 to regulate the temperature of the cover body 1 , and the second temperature regulating component is sleeved on the outside of the container 2 to regulate the temperature of the container 2 .

[0035] The gas assembly includes an air inlet pipe 10 and an exhaust pipe 11 , both of which are sealed and penetrated through the cover body 1 , one end of the air inlet pipe 10 extends toward the bottom of the container 2 , and one end of the exhaust pipe 11 is located at the opening of the container 2 .

[0036] The first detection unit 3 is arranged on the contact surface to detect the corrosion of the contact surface. The second detection unit is arranged at the bottom of the container 2 to detect the corrosion of the bottom of the container 2.

[0037] It should be noted that, in this embodiment, the first detection unit 3 and the second detection unit are both specifically wire beam electrodes. Figure 2 As shown, the wire electrode of the wire beam electrode is made of pipeline steel and is processed into 2×2mm 2 The surface size of the cover 1 is 10×10 and the electrodes are arranged in an array with an interval of 0.5 mm, and the electrodes are insulated from each other by epoxy resin. In addition, the cover 1 is detachably connected to the container 2 by bolts.

[0038] During the monitoring process, the first detection unit 3 and the second detection unit have the functions of detecting electrochemical reactions. The wire bundle electrode can effectively participate in electrochemical reactions due to its large specific surface area and good conductivity, and is suitable for monitoring a variety of corrosive media. The functions also include local corrosion analysis, which can measure specific areas and identify local corrosion, pitting and other phenomena.

[0039] The data detected by the first detection unit 3 and the second detection unit include:

[0040] Current density, which is used to evaluate corrosion rate by measuring the change in current, usually expressed in mA / cm 2 As unit.

[0041] Polarization curve data can generate IE curve (current-potential curve) to obtain corrosion current density (Icorr), corrosion potential, etc.

[0042] Electrochemical impedance spectroscopy (EIS) monitors the kinetic characteristics of electrochemical reactions on the material surface and analyzes its corrosion resistance.

[0043] Time variation curve, the data changes of current and potential over time to observe the dynamics of the corrosion process.

[0044] For example, when using the device to conduct a simulation experiment, the required liquid medicine is placed in the container 2, the cover 1 is sealed and installed above the container 2, and then the experiment can be started. During the experiment, the temperature of the cover 1 is lowered by manipulating the first temperature adjustment component, and the temperature of the liquid in the container 2 is increased by manipulating the second temperature adjustment component. At this time, a high temperature difference is formed between the contact surface on the cover 1 and the liquid in the container 2. During the experiment, the monitoring personnel can input the experimental gas into the liquid at the bottom of the container 2 through the air inlet pipe 10 according to the needs of the experiment, and the exhaust pipe 11 plays the role of air pressure balance.

[0045] The device as a whole simulates the transportation environment of the submarine pipeline through the first temperature adjustment component and the second temperature adjustment component. The contact surface on the cover body 1 corresponds to the top of the pipeline. When there is a large temperature difference between the transportation medium inside the pipeline and the environment outside the pipeline, the hot and humid steam inside the pipeline will condense at the top of the pipeline. The first temperature adjustment component and the second temperature adjustment component can form a high temperature difference between the contact surface on the cover body 1 and the liquid in the container 2, so that the hot and humid steam in the liquid inside the container 2 will condense at the contact surface. The experimental gas entering from the exhaust pipe 11 can simulate the volatile media such as CO2, H2S, organic acid, etc. transported inside the submarine pipeline, thereby inducing the top corrosion problem. The first detection unit 3 is used to detect the corrosion of the contact surface. In addition, the bottom of the container 2 is used to simulate the solid particles at the bottom of the transportation pipeline, which will cause serious under-scale corrosion problems. The second detection unit is used to detect the corrosion of the bottom of the container 2.

[0046] The present invention can simulate the actual operation conditions of marine oil and gas pipelines under different environments through the first temperature adjustment component and the second temperature adjustment component, and can continuously monitor the local corrosion conditions of top corrosion and under-deposit corrosion through the wire beam electrodes at the top and bottom of the container 2, and provide real-time feedback of corrosion information for early warning evaluation.

[0047] In this embodiment, preferably, in order to improve the experimental operation flexibility of the experimenter, a liquid inlet pipe 12 is further provided on the cover body 1, and a liquid discharge pipe 13 is provided at the bottom of the container 2. The experimenter can regulate the liquid in the container 2 according to actual needs.

[0048] In one embodiment, the overall structure of the first temperature regulating component is further refined, and the first temperature regulating component includes a temperature control chamber 4, which is opened inside the cover body 1, and the bottom of the temperature control chamber 4 is a contact surface; the temperature control chamber 4 is provided with a liquid inlet and a liquid outlet for connecting an external water cooling circulation device.

[0049] In one embodiment, the overall structure of the second temperature adjustment component is further refined, and the second temperature adjustment component includes a heating plate 14, which is sleeved in the side wall interlayer of the container 2. The control wire of the heating plate 14 extends to the outside of the container 2 for control connection of an external power supply device.

[0050] In this embodiment, it is more preferable that, in order to optimize the heat preservation effect on the container 2 , the second temperature adjustment component further includes a heat preservation layer 15 , and the heat preservation layer 15 is sleeved on the outside of the container 2 .

[0051] In one embodiment, a first temperature sensor 5 is provided on the contact surface to monitor the temperature of the contact surface. A second temperature sensor 6 is suspended from the cover 1, and the second temperature sensor 6 is located in the upper half of the container 2 to monitor the gas temperature inside the container 2. A third temperature sensor 7 is also suspended from the cover 1, and the third temperature sensor 7 is located in the lower half of the container 2 to monitor the liquid temperature inside the container 2.

[0052] The three temperature sensors are respectively used to detect the temperature conditions of different parts of the container 2. In actual use, the three temperature sensors can display corresponding temperature data through an external display device so that the experimenter can adjust the experiment and improve the data clarity of the experiment.

[0053] In one embodiment, more preferably, a reference electrode 8 is suspended on the cover 1 , and the reference electrode 8 is located in the lower half of the container 2 .

[0054] The reference electrode 8 is used to record the potential of the reference electrode 8 itself (usually unchanged) for comparison. The reference electrode 8 is also used to provide a necessary benchmark to more accurately analyze the potential changes of other electrodes.

[0055] The potential of the reference electrode 8 is stable, so that the measurement result is reliable. The addition of the reference electrode 8 can provide a stable potential reference for the experiment. At the same time, the reference electrode 8 can also ensure a reliable comparison of the corrosion properties of the same interface, ensuring the repeatability and accuracy of the experimental results.

[0056] In one embodiment, it is more preferred that a contrast electrode 9 is suspended on the cover 1 , and the contrast electrode 9 is located in the lower half of the container 2 .

[0057] The comparison electrode 9 can record the potential difference between the comparison electrode and the test electrode to monitor the corrosion process. It is usually used as a comparison to observe the impact of different environments on the electrode.

[0058] It can also be used to provide a reference for potential changes in electrochemical reactions to ensure accurate measurement of potential in experiments. It can also be used to compare relative potentials with other electrodes (such as rusty material electrodes) to understand their corrosion characteristics.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An experimental monitoring device for simulating corrosion on the top and under-scale of submarine oil and gas pipelines, characterized in that: include: Container to hold the experimental liquid; A cover body, the cover body is detachably sealed to the opening of the container, the cover body has a contact surface, and the contact surface constitutes an upper sealing surface of the container; a first temperature regulating component, the first temperature regulating component being arranged on the cover body and being used for regulating the temperature of the cover body; A second temperature regulating component, which is sleeved on the outside of the container and is used to regulate the temperature of the container; A gas assembly, the gas assembly comprising an air inlet pipe and an exhaust pipe, the air inlet pipe and the exhaust pipe are both sealed and penetrated on the cover body, one end of the air inlet pipe extends toward the bottom of the container, and one end of the exhaust pipe is located at the opening of the container; A first detection unit, the first detection unit is arranged on the contact surface and is used to detect corrosion conditions of the contact surface; as well as The second detection unit is arranged at the bottom of the container to detect the corrosion condition of the bottom of the container.

2. The experimental monitoring device according to claim 1, characterized in that: The first temperature adjustment assembly includes a temperature control chamber; The temperature control chamber is opened inside the cover body, and the bottom of the temperature control chamber is the contact surface; the temperature control chamber is provided with a liquid inlet and a liquid outlet for connecting to an external water cooling circulation device.

3. The experimental monitoring device according to claim 1, characterized in that: The second temperature regulating component comprises a heating plate, and the heating plate is sleeved in the side wall interlayer of the container.

4. The experimental monitoring device according to claim 3, characterized in that: The second temperature regulating component also includes a heat-insulating layer, and the heat-insulating layer is sleeved on the outside of the container.

5. The experimental monitoring device according to any one of claims 1 to 4, characterized in that: A first temperature sensor is arranged on the contact surface to monitor the temperature of the contact surface.

6. The experimental monitoring device according to any one of claims 1 to 4, characterized in that: A second temperature sensor is suspended on the cover body and is located at the upper half of the container for monitoring the gas temperature inside the container.

7. The experimental monitoring device according to any one of claims 1 to 4, characterized in that: A third temperature sensor is suspended on the cover body and is located at the lower half of the container for monitoring the temperature of the liquid inside the container.

8. The experimental monitoring device according to any one of claims 1 to 4, characterized in that: A reference electrode is suspended on the cover, and the reference electrode is located in the lower half of the container.

9. The experimental monitoring device according to any one of claims 1 to 4, characterized in that: A contrast electrode is suspended on the cover body and is located at the lower half of the container.

10. The experimental monitoring device according to any one of claims 1 to 4, characterized in that: The cover body is also provided with a liquid inlet pipe, and the bottom of the container is provided with a liquid discharge pipe.

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