An experimental device for simulating corrosion failure process of oil and gas field equipment in a corrosion environment

Abstract

The present application relates to a kind of experimental apparatus of simulating corrosion environment in oil and gas field equipment corrosion failure process, including kettle cover and kettle body bolt connection, kettle body is equipped with electric heating system and lining, lining is connected with kettle cover bottom, the end of coaxial magnetic force drive stirring system is rotating shaft, rotating shaft passes through kettle cover and extends into lining;Gas inlet valve, exhaust valve, pressure transmitter, safety burst valve group, temperature transmitter, upper liquid discharge needle valve respectively from the insertion port of kettle cover extend into lining, the control system is used to with coaxial magnetic force drive stirring system, electric heating system, gas inlet valve, exhaust valve, pressure transmitter, safety burst valve group, temperature transmitter, upper liquid discharge needle valve connection.The present application effectively reduces the cost increase phenomenon caused by the function overlap of single equipment, can meet the corrosion behavior research in high temperature and high pressure environment, supercritical water environment.

Description

Technical Field

[0001] This invention relates to an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment, belonging to the field of oil and gas field corrosion and protection technology. Background Technology

[0002] Corrosion failures in oil and gas fields are currently occurring frequently, threatening their efficient and safe production. These failures are the result of the combined effects of materials and complex environmental factors. Therefore, identifying the main corrosion-causing factors and evaluating the effectiveness of corrosion prevention measures helps improve the management quality of corrosion protection in oil and gas fields, ensuring that corrosion failures are preventable and controllable, effectively extending the maintenance-free period of production wells, strengthening the integrity management of water and gas injection pipelines, and effectively improving the production efficiency of oil and gas fields. Currently, using CO2 injection-production technology for oil and gas field development is one of the effective means to increase development efficiency. Injecting CO2 into the formation can effectively replenish formation energy and effectively reduce the concentration of CO2 in the atmosphere. CCUS-EOR technology is an important technical means to meet the "dual carbon" requirements. CO2 in the formation increases reservoir production through miscibility, extraction, reduction of fluid viscosity, reduction of interfacial tension, and auxiliary gas drive. This technology has significant advantages and a wide range of applications. Meanwhile, in the development of extra-heavy oil reservoirs, high-temperature steam or supercritical water, as a highly efficient heat transfer medium, can effectively improve fluid flow in the reservoir, significantly improving the fluidity of high-viscosity reservoir fluids. Both of these media are corrosive to oil casing materials and oil and gas equipment. Under the individual or synergistic effects of these two factors, the corrosion failure trend of oil and gas equipment increases, and the difficulty of preventing corrosion failure increases. In the current oil and gas field development process, various harsh corrosive media interact, and the service environment of oil and gas equipment materials is quite complex, with many environmental factors affecting normal operation. With the development of corrosion science and technology, the research methods and testing standards for corrosion failure are becoming increasingly complex. Indoor corrosion failure experiments strive to simulate the real service environment of oil and gas fields. The development of corrosion testing equipment needs to consider factors such as service environment temperature, total pressure, corrosive medium concentration, gas partial pressure, medium phase, and environmental flow conditions.

[0003] In the prior art, Chinese invention patent application number 202110211869.0 discloses an experimental device suitable for the corrosion of metal tubing, including an N2 gas source, a liquid replenishment unit, a CO2 gas path unit, a mixing device, a high-temperature and high-pressure corrosion experimental device unit, and a supercritical fluid chromatography analysis unit. The outlets of the liquid replenishment unit and the CO2 gas path unit are both connected to the inlet of the mixing device, and the outlets of the mixing device and the N2 gas source are both connected to the inlet of the high-temperature and high-pressure corrosion experimental device unit. The supercritical fluid chromatography analysis unit is connected to the high-temperature and high-pressure corrosion experimental device unit. This solves the problem that in the prior art, when studying the corrosion effect of supercritical CO2 fluid on metal tubing, the issue of phase change was not considered, and the corrosion problem of tubing under actual production conditions could not be realistically and accurately evaluated. When conducting indoor simulation evaluation experiments on various corrosion factors, the functions of the equipment increase. Existing indoor experimental equipment has relatively single functions. To simulate the real service environment, multiple devices are often required, which increases equipment costs, space requirements, and the difficulty of use and maintenance. Summary of the Invention

[0004] This invention provides an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in corrosive environments. Its purpose is to provide a device capable of studying corrosion behavior in CO2-containing oil and gas field environments, as well as the failure behavior of oil casing steel pipes in supercritical water environments. It can also conduct corrosion behavior studies under different flow rate conditions and evaluate the performance of corrosion inhibitors under flow conditions. This invention aims to simulate the real-world service conditions of materials in oil and gas field environments, study corrosion failure behavior under multi-physics coupling conditions, evaluate material corrosion resistance, rapidly select corrosion inhibitors, and simulate the injection process of corrosion inhibitors under flow conditions.

[0005] To achieve the above objectives, this invention provides an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment. The apparatus includes a vessel body, a vessel lid, a coaxial magnetically driven stirring system, and a control system. The vessel lid is bolted to the vessel body, and an inner liner is provided inside the vessel body. An electric heating system is fixed outside the vessel body, and the inner liner is connected to the bottom of the vessel lid. The end of the coaxial magnetically driven stirring system is a rotating shaft that passes through the vessel lid and extends into the inner liner. An inlet valve, an exhaust valve, a pressure transmitter, a safety rupture valve assembly, a temperature transmitter, and an upper drain needle valve extend into the inner liner from various ports on the vessel lid. The control system is used to connect to the coaxial magnetically driven stirring system, the electric heating system, the inlet valve, the exhaust valve, the pressure transmitter, the safety rupture valve assembly, the temperature transmitter, and the upper drain needle valve.

[0006] Furthermore, the vessel body can also be detachably connected to an electric lifting system, which is used to control the movement of the vessel lid in the vertical direction.

[0007] Furthermore, the lid of the vessel is provided with screw holes, and the electric lifting system is provided with fixing bolts that mate with the screw holes.

[0008] Furthermore, the lid of the vessel is also equipped with a handrail.

[0009] Furthermore, the reactor lid is detachably connected to a working electrode, a reference electrode, and an auxiliary electrode.

[0010] Furthermore, the rotating shaft is detachably connected to one of the following: static hanging plate clamp, dynamic rotating hanging plate clamp, four-point bending clamp, and rotating cage hanging plate clamp.

[0011] Furthermore, the rotating shaft is connected to a stirring paddle, and the vessel body is also connected to an annular pipeline, on which a circulating pump, a vent valve, and a flow meter are installed.

[0012] Furthermore, the vessel body is connected to an annular pipe section, on which a circulating pump, a flow meter, a corrosion inhibitor injection valve, a plunger pump, a corrosion test piece skid-mounted device, and an electrochemical noise probe skid-mounted device are sequentially installed.

[0013] Furthermore, the lining is made of titanium alloy or Hastelloy.

[0014] Furthermore, a sapphire glass observation window is installed on the annular pipe section.

[0015] This invention discloses an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in corrosive environments. Its advantages include the ability to study corrosion behavior in high-temperature, high-pressure CO2-containing environments and supercritical water environments; the ability to simulate the service environment of different oil and gas field production processes; the capacity to study corrosion behavior under stress-corrosion coupling conditions; the ability to conduct corrosion behavior studies under different rotational speeds and service phases; the ability to perform corrosion experiments with different sand concentrations; the ability to identify the main environmental factors causing corrosion failure of pipeline materials under flowing conditions; the ability to conduct corrosion inhibitor dripping experiments in flowing environments to verify the effective concentration of corrosion inhibitors under flowing conditions; and the ability to use a pressurized in-situ sampling system to sample the experimental liquid under flowing conditions. This invention allows for sampling and analysis of ion concentration changes and corrosion inhibitor concentration half-life; it can evaluate the influence of wall shear force on flow corrosion rate; and by using a replaceable corrosion-resistant alloy liner, it can effectively prevent localized corrosion of the reactor body and wall fouling during the experiment, effectively extending the service life of the equipment. In addition, this invention simulates multiple corrosion experiments with a single reactor body and external piping, effectively reducing the cost increase caused by functional overlap of a single device, and more accurately simulating the real working conditions of the service environment. It provides an equipment foundation for multiple research methods and more accurately identifies corrosion failure kinetic processes, enabling high-throughput material corrosion resistance analysis and contributing to the development of low-cost and high-efficiency corrosion protection processes in CO2-containing or supercritical water environments in oil and gas fields. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the vessel structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the vessel in this invention;

[0019] Figure 3 This is a schematic diagram of the static hanging plate clamp, the four-point bending clamp, and the rotating cage hanging plate clamp in this invention;

[0020] Figure 4 This is a schematic diagram simulating corrosion of the connection between the vessel body and the annular pipeline in this invention;

[0021] Figure 5 This is a schematic diagram simulating corrosion of the connection between the vessel body and the annular pipe section in this invention.

[0022] The figure shows: 1. Reactor body; 2. Reactor lid; 3. Coaxial magnetic drive stirring system; 4. Liner; 5. Inlet valve; 6. Exhaust valve; 7. Pressure transmitter; 8. Safety burst valve assembly; 9. Temperature transmitter; 10. Upper drain needle valve; 11. Electric lifting system; 12. Fixing bolt; 13. Screw hole; 14. Handrail; 15. Static sample holder; 16. Four-point bending fixture; 17. Rotating cage sample holder; 18. Stirring paddle; 19. Rotating shaft; 20. Working electrode; 21. Reference electrode; 22. Auxiliary electrode; 23. Annular pipeline; 24. Circulating pump; 25. Vent valve; 26. Flow meter; 27. Annular pipe section; 28. Corrosion inhibitor injection valve; 29. ​​Plunger pump; 30. Corrosion sample skid-mounted device; 31. Electrochemical noise probe skid-mounted device; 32. Liquid sampling dual valve; 33. Liquid sampling module. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] To further understand the invention, the technical solution will be further described below in conjunction with specific embodiments.

[0025] Example 1: As Figures 1-3 As shown, this embodiment provides an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment. Specifically, it includes a vessel body 1, a vessel cover 2, a coaxial magnetically driven stirring system 3, and a control system. The vessel body 1 and the vessel cover 2 are connected by bolts and sealed with gaskets. The vessel body 1 has an inner liner 4, which is detachably connected to the bottom of the vessel cover 2. An electric heating system is located outside the vessel body 1 and is electrically connected to a temperature transmitter 9. The end of the coaxial magnetically driven stirring system 3 is a rotating shaft 19, which passes through the vessel cover 2 and extends into the inner liner 4. An inlet valve 5, an exhaust valve 6, a pressure transmitter 7, a safety rupture valve assembly 8, a temperature transmitter 9, and an upper drain needle valve 10 extend from their respective ports in the vessel cover 2 into the inner liner 4. The control system is used to connect to the coaxial magnetically driven stirring system 3, the electric heating system, the inlet valve 5, the exhaust valve 6, the pressure transmitter 7, the safety rupture valve assembly 8, the temperature transmitter 9, and the upper drain needle valve 10. The control system can also display and collect data. The safety rupture valve assembly 8 provides a final safety guarantee; when the high temperature and pressure inside the vessel 1 become uncontrollable, the safety rupture valve assembly 8 releases pressure. The pressure transmitter 7 and temperature transmitter 9 are used to monitor the pressure and temperature inside the vessel 1, respectively. After the experiment is completed, the liquid inside the vessel 1 is discharged through the upper drain needle valve 10.

[0026] The vessel body 1 is also detachably connected to an electric lifting system 11. The control system is connected to the electric lifting system 11, which controls the vertical movement of the vessel lid 2. Specifically, the vessel lid 2 has screw holes 13, and the electric lifting system 11 has fixing bolts 12 that mate with the screw holes 13. When the vessel lid 2 needs to be lifted, the electric lifting system 11 lowers, the fixing bolts 12 connect with the screw holes 13, and the electric lifting system 11 lifts the vessel lid 2 to the designated position. The vessel lid 2 is also equipped with a handle 14 for easy access by the operator.

[0027] In this embodiment, the design temperature of the vessel 1 is 500℃, and the design pressure is 40MPa; the actual maximum operating temperature is 450℃, and the actual maximum operating pressure is 35MPa. The volume of the vessel 1 is 5L. The temperature transmitter 9 uses a K-type thermocouple with a maximum temperature resistance of 800℃. A CO2 bipolar gas booster pump is provided, along with a CO2 pressure reducer and gas pipeline. The control system can display the stirring rate inside the vessel. The design speed of the rotating shaft 19 is 0~1200r / min, and the design torque is 1.5~2N·m.

[0028] This invention can simulate dynamic and static plate experiments, four-point stress bending experiments, rotating cage plate experiments, and dynamic and static plate experiments in a supercritical water environment under high temperature, high pressure, or high temperature and high pressure conditions. Specifically, different clamps are selectively connected to the rotating shaft 19 according to the different experiments being conducted. For example, when a four-point stress bending experiment is required, the four-point bending clamp 16 is connected to the rotating shaft 19. When a rotating cage plate experiment is required, the four-point bending clamp 16 is removed, and the rotating cage plate clamp 17 is connected to the rotating shaft 19. The different clamps include a static plate clamp 15, a dynamic rotating plate clamp, a four-point bending clamp 16, and a rotating cage plate clamp 17. The coaxial magnetic drive stirring system 3 can be adjusted to different speeds. The inner liner 4 is made of TC4 titanium alloy, which has strong high temperature resistance and corrosion resistance.

[0029] When using vessel body 1, first separate vessel lid 2 from vessel body 1, connect electric lifting system 11 to vessel lid 2, raise vessel lid 2 to an operable height, add 1.5-3L of experimental liquid into liner 4, install experimental fixtures and related experimental specimens, such as static hanging specimen fixture 15, dynamic rotating hanging specimen fixture, four-point bending fixture 16, and rotating cage hanging specimen fixture 17, lower vessel lid 2, remove the connection between vessel lid 2 and fixing bolt 12, then fix vessel lid 2 to vessel body 1 with bolts, pressurize through air inlet valve 5, heat through electric heating system, and start the experiment when the temperature reaches the required experimental temperature.

[0030] Example 2: Figures 1-3 As shown, in this embodiment, based on Embodiment 1, the working electrode 20, reference electrode 21, and auxiliary electrode 22 are inserted into the respective ports of the vessel lid 2. The maximum operating temperature of the working electrode 20, reference electrode 21, and auxiliary electrode 22 is 180°C, and the maximum operating pressure is 20 MPa. The electrode material is Hastelloy. In this embodiment, the coating experiment and the electrochemical corrosion experiment can be performed simultaneously.

[0031] Example 3: As Figure 4As shown, this embodiment provides an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment. Specifically, it includes a vessel body 1, a vessel lid 2, a coaxial magnetically driven stirring system 3, and a control system. The vessel body 1 and the vessel lid 2 are connected by bolts and sealed with gaskets. The vessel body 1 has an inner liner 4, which is detachably connected to the bottom of the vessel lid 2. An electric heating system is installed on the outside of the vessel body 1. The end of the coaxial magnetically driven stirring system 3 is a rotating shaft 19, which passes through the vessel lid 2 and extends into the inner liner 4. An inlet valve 5, an exhaust valve 6, a pressure transmitter 7, a safety rupture valve assembly 8, a temperature transmitter 9, and an upper drain needle valve 10 extend from their respective ports in the vessel lid 2 into the inner liner 4. The control system is used to connect to the coaxial magnetically driven stirring system 3, the electric heating system, the inlet valve 5, the exhaust valve 6, the pressure transmitter 7, the safety rupture valve assembly 8, the temperature transmitter 9, and the upper drain needle valve 10. The control system can also display and collect data. The safety rupture valve assembly 8 provides a final safety guarantee. When the high temperature and pressure inside the vessel 1 become uncontrollable, the safety rupture valve assembly 8 releases pressure. The pressure transmitter 7 and temperature transmitter 9 are used to monitor the pressure and temperature inside the vessel 1, respectively. After the experiment is completed, the liquid inside the vessel 1 is discharged through the upper drain needle valve 10.

[0032] The inner liner 4 is made of C276 Hastelloy alloy. When an external loop flow experiment is required, the vessel lid 2 is connected to the annular pipe 23 and sealed using a hard seal method; the vessel body 1 is connected to the other end of the annular pipe 23 with a hard seal. At this time, the vessel body 1 acts as a pressure storage container and circulates fluid together with the annular pipe 23. The rotating shaft 19 is connected to the stirring paddle 18, which is a two-layer downward-pressurized three-bladed paddle. The annular pipe 23 is equipped with a circulation pump 24, a vent valve 25, and a flow meter 26. A liquid extraction double valve 32 is also provided on the pipe between the vent valve 25 and the flow meter 26. The rotating shaft 19 is designed to rotate at a speed of 0 to 1200 r / min, with a design torque of 1.5 to 2 N·m and a maximum operating speed of 800 r / min. The stirring paddle 18 facilitates the circulation of sand liquid inside the vessel. The inner diameter of the annular pipe 23 is 1 inch. The connection part of the annular pipe 23 adopts a hard seal structure and is made of C276 Hastelloy alloy, thereby simulating the service environment of oil and gas field downhole and surface pipelines.

[0033] Example 4: Figure 5As shown, this embodiment provides an experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment. Specifically, it includes a vessel body 1, a vessel lid 2, a coaxial magnetically driven stirring system 3, and a control system. The vessel body 1 and the vessel lid 2 are connected by bolts and sealed with gaskets. The vessel body 1 has an inner liner 4, which is detachably connected to the bottom of the vessel lid 2. An electric heating system is installed on the outside of the vessel body 1. The end of the coaxial magnetically driven stirring system 3 is a rotating shaft 19, which passes through the vessel lid 2 and extends into the inner liner 4. An inlet valve 5, an exhaust valve 6, a pressure transmitter 7, a safety rupture valve assembly 8, a temperature transmitter 9, and an upper drain needle valve 10 extend from their respective ports in the vessel lid 2 into the inner liner 4. The control system is used to connect to the coaxial magnetically driven stirring system 3, the electric heating system, the inlet valve 5, the exhaust valve 6, the pressure transmitter 7, the safety rupture valve assembly 8, the temperature transmitter 9, and the upper drain needle valve 10. The control system can also display and collect data. The safety rupture valve assembly 8 provides a final safety guarantee. When the high temperature and pressure inside the vessel 1 become uncontrollable, the safety rupture valve assembly 8 releases pressure. The pressure transmitter 7 and temperature transmitter 9 are used to monitor the pressure and temperature inside the vessel 1, respectively. After the experiment is completed, the liquid inside the vessel 1 is discharged through the upper drain needle valve 10.

[0034] The inner liner 4 is made of C276 Hastelloy alloy. When an external loop flow experiment is required, the vessel lid 2 is connected to the annular pipe section 27 and sealed using a hard seal method; the vessel body 1 is then hard-sealed to the other end of the annular pipe section 27. At this time, the vessel body 1 acts as a pressure storage container, circulating fluid together with the annular pipe section 23. The annular pipe section 27 is sequentially equipped with a circulation pump 24, a flow meter 26, a corrosion inhibitor injection valve 28, a plunger pump 29, a corrosion test piece skid-mounted device 30, and an electrochemical noise probe skid-mounted device 31. A sapphire glass observation window is also installed on the annular pipe section 27 to observe the flow state inside the pipe. The annular pipe section 27 is also equipped with a liquid sampling module 33, which uses a double high-pressure valve design, equipped with a fixed-volume liquid storage chamber and a drain pipe to ensure safe operation during pressurized liquid sampling. The electrochemical noise probe skid-mounted device 31 includes an electrochemical noise probe and a data acquisition unit, which collects data on the electrochemical noise. By adding a corrosion test piece skid-mounted device 30 and an electrochemical noise probe skid-mounted device 31 to the annular pipe section 27, flow electrochemical noise testing or plate-mounted experiment testing can be conducted. The corrosion inhibitor is pumped into the circulating fluid within the annular pipe section 27 via a plunger pump 29, and liquid can be collected via a liquid sampling module 33. The annular pipe section 27 can perform liquid-phase circulation, enabling electrochemical noise monitoring and corrosion inhibitor drop-addition experiments, with a minimum single drop volume of 30 mg. Fluid samples can be taken from inside the annular pipe section 27 for analysis, with a single sample volume of 10 ml. Electrochemical noise can be detected both within the vessel body 1 and the annular pipe section 27, ensuring the accuracy of the electrochemical noise signal.

[0035] This invention evaluates the corrosion resistance of materials under high temperature, high pressure, or high temperature and high pressure environments; it simulates high temperature and high pressure multiphase flow media environments to study corrosion mechanisms, corrosion morphology, and corrosion rates. This invention can simulate the effects of different oil casing materials, different surface treatment processes, different temperatures, salinity, CO2 partial pressure, and rotational speeds on corrosion behavior, and test the corrosion inhibition efficiency of corrosion inhibitors. It can perform experimental tests on dry gas phase CO2 injection processes, CO2 production well gas-liquid flow processes, supercritical water corrosion processes, and the effects of different wall shear forces and flow velocities on corrosion behavior.

[0036] 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment, characterized in that, The system includes a vessel body (1), a vessel cover (2), a coaxial magnetic drive stirring system (3), and a control system. The vessel cover (2) is bolted to the vessel body (1). The vessel body (1) is provided with an inner liner (4), which is connected to the bottom of the vessel cover (2). An electric heating system is fixed to the outside of the vessel body (1). The end of the coaxial magnetic drive stirring system (3) is a rotating shaft (19), which passes through the vessel cover (2) and extends into the inner liner (4). An air inlet valve (5), an exhaust valve (6), a pressure transmitter (7), a safety rupture valve group (8), a temperature transmitter (9), and an upper drain needle valve (10) extend into the inner liner (4) from the respective ports of the vessel cover (2). The control system is used to connect with the coaxial magnetic drive stirring system (3), the electric heating system, the air inlet valve (5), the exhaust valve (6), the pressure transmitter (7), the safety rupture valve group (8), the temperature transmitter (9), and the upper drain needle valve (10).

2. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 1, characterized in that, The vessel body (1) can also be detachably connected to an electric lifting system (11), which is used to control the movement of the vessel lid (2) in the vertical direction.

3. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 2, characterized in that, The lid (2) is provided with a screw hole (13), and the electric lifting system (11) is provided with a fixing bolt (12) that mates with the screw hole (13).

4. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 1, characterized in that, The lid (2) is also equipped with a handrail (14).

5. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 1, characterized in that, The rotating shaft (19) is detachably connected to one of the following: static hanging plate clamp (15), dynamic rotating hanging plate clamp, four-point bending clamp (16), and rotating cage hanging plate clamp (17).

6. An experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to any one of claims 1 or 5, characterized in that, The lid (2) is detachably connected to the working electrode (20), the reference electrode (21), and the auxiliary electrode (22).

7. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 1, characterized in that, The rotating shaft (19) is connected to the stirring paddle (18), and the vessel body (1) is also connected to the annular pipe (23). The annular pipe (23) is equipped with a circulating pump (24), a vent valve (25), and a flow meter (26).

8. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 1, characterized in that, The vessel body (1) is connected to an annular pipe section (27), and the annular pipe section (27) is sequentially equipped with a circulating pump (24), a flow meter (26), a corrosion inhibitor injection valve (28), a plunger pump (29), a corrosion test piece skid-mounted device (30), and an electrochemical noise probe skid-mounted device (31).

9. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 1, characterized in that, The lining (4) is made of titanium alloy or Hastelloy.

10. The experimental apparatus for simulating the corrosion failure process of oil and gas field equipment in a corrosive environment according to claim 8, characterized in that, A sapphire glass observation window is installed on the annular pipe section (27).

Images