Device for monitoring release condition and corrosion inhibition performance of solid corrosion inhibitor in acidic medium

Abstract

The utility model discloses a device for monitoring the release condition and the corrosion inhibition performance of a solid corrosion inhibitor in an acidic medium, and belongs to the field of monitoring of metal corrosion conditions. The device comprises a first container, a hydrogen sensor is arranged on a top cover of the first container in a penetrating mode, an opening is formed in the top cover of the first container, a sealing plug is arranged at the opening and connected with a hook, and the bottom of the hook is connected with a metal sheet to be detected. And the first container is connected with a solid corrosion inhibitor release rate testing device. By means of the device, the change of the corrosion rate can be calculated, and meanwhile the change of the release rate of the solid corrosion inhibitor can be judged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of monitoring metal corrosion condition relates to a device for monitoring solid corrosion inhibitor release condition and corrosion inhibition performance in acid medium. BACKGROUND

[0002] Corrosion not only causes huge economic losses, but also leads to safety accidents and environmental damage. Metals often corrode severely when they are in acid medium. For example, in the development process of high-acid oil and gas fields, the presence of H2S, CO2, Cl - and S elements and other media has a great impact on the corrosion of ground pipelines and equipment. Therefore, corrosion prevention is a very important thing in the oil field. Liquid corrosion inhibitors commonly used in oil fields have the disadvantages of large workload during dosing and high maintenance cost of dosing equipment, and have been gradually replaced by solid corrosion inhibitors that can be dosed flexibly and have good corrosion prevention effect.

[0003] However, solid corrosion inhibitors have a certain service life, and need to be supplemented after the period is exceeded, so as to provide good protection for the equipment. Therefore, it is of great significance for the safe production of oil and gas fields to use correct analysis methods to monitor the internal corrosion status of these pipelines and equipment in real time, master the corrosion status and corrosion prevention effect, and take effective measures to slow down corrosion in time.

[0004] The commonly used methods at present are weight loss coupon and weight change before and after the action of solid corrosion inhibitor. This analysis method is complicated to operate and has a long experimental period. The data measured is the average corrosion rate of the device in a period of time, which cannot reflect the real-time corrosion information of the equipment, so it cannot be used for online analysis. The electrochemical method is high in cost, and the corrosion rate obtained has a certain deviation from the true value. In addition, the test device in the prior art cannot monitor the release rate of solid corrosion inhibitor, which means that the corrosion inhibition effect of the solid corrosion inhibitor under specific conditions cannot be accurately evaluated. This may lead to excessive or insufficient use of corrosion inhibitors in actual application, which not only wastes resources, but also may not achieve the expected protection effect. Moreover, if the release rate of the corrosion inhibitor cannot be effectively monitored, the metal equipment may fail prematurely due to corrosion.

[0005] In summary, there is an urgent need for a device that is simple and convenient to operate, which can monitor the metal corrosion rate and the release rate of the corrosion inhibitor in acid medium in real time. Utility model content

[0006] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a device for monitoring the release condition and corrosion inhibition performance of solid corrosion inhibitor in acid medium. Through the device, not only the change of corrosion rate can be calculated, but also the change of the release rate of solid corrosion inhibitor can be judged.

[0007] In order to achieve the above object, the utility model adopts the following technical scheme to realize:

[0008] The utility model provides a device for monitoring solid corrosion inhibitor release condition and corrosion inhibition performance in acid medium, first container is positioned on the top cover of first container and is provided with hydrogen sensor, the top cover of first container is provided with opening, the opening is provided with sealing plug, the sealing plug is connected with hook, the bottom of hook is connected with the metal piece of measurement, first container is connected with solid corrosion inhibitor release rate testing device.

[0009] In an embodiment, the bottom side wall of the first container is provided with an outlet, and the outlet is connected with the solid corrosion inhibitor release rate testing device.

[0010] In an embodiment, the solid corrosion inhibitor release rate testing device comprises an ultraviolet monitoring sensor, a second container, and an ultraviolet spectrometer; the ultraviolet monitoring sensor is arranged inside the second container and connected with the ultraviolet spectrometer.

[0011] In an embodiment, the ultraviolet monitoring sensor extends below the liquid level of the liquid in the second container.

[0012] In an embodiment, the first container and the second container are connected through a glass pipeline.

[0013] In an embodiment, a filter membrane is arranged at the outlet, and the filter membrane is used to isolate impurity components.

[0014] In an embodiment, the filter membrane is a 0.22-micron filter membrane.

[0015] In an embodiment, the bottom of the hydrogen sensor penetrates through the top cover of the first container.

[0016] In an embodiment, the bottom of the hydrogen sensor is located above the liquid medium in the first container, and is used to read the change of gas concentration in the first container.

[0017] In an embodiment, the hook is a glass hook.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The device for monitoring solid corrosion inhibitor release condition and corrosion inhibition performance in acid medium can rapidly reflect the corrosion rate of the metal by real-time monitoring the change of hydrogen concentration generated by metal corrosion in the acid medium through the hydrogen sensor, and can real-time monitor the release condition of the solid corrosion inhibitor by combining the solid corrosion inhibitor release rate testing device, thereby providing data support for timely adjusting the use of the corrosion inhibitor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a schematic diagram of the device for monitoring the release condition and corrosion inhibition performance of the solid corrosion inhibitor in the acid medium of the present application;

[0021] 1-hydrogen sensor; 2-filter membrane; 3-sealing plug; 4-glass hook; 5-steel sheet for testing; 6-solid corrosion inhibitor; 7-ultraviolet monitoring sensor; 8-ultraviolet spectrometer. DETAILED DESCRIPTION

[0022] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0023] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] The present application will be further described in detail below in conjunction with the drawings:

[0025] Referring to Figure 1The utility model provides a kind of device for monitoring solid corrosion inhibitor release condition and corrosion inhibition performance in acidic medium, including first container, hydrogen sensor 1 is arranged on the top cover of first container and penetrates, the bottom of hydrogen sensor 1 passes the top cover of first container, the bottom of hydrogen sensor 1 is above the liquid medium in first container, for reading the change of gas concentration in first container, the corrosion rate of reaction system is calculated by the change value of gas concentration.The top cover of first container is provided with opening, opening is provided with sealing plug 3, sealing plug 3 is connected with hook, hook is glass hook 4, the bottom of hook is connected with the metal sheet to be measured, sealing plug 3 is used to seal, so that the inside of first container constitutes closed environment;The bottom sidewall of first container is provided with outlet, outlet is provided with 0.22 micrometer filter membrane 2, filter membrane 2 is used to isolate impurity component, outlet is connected with solid corrosion inhibitor release rate test device.

[0026] Solid corrosion inhibitor release rate test device includes ultraviolet monitoring sensor 7, second container, ultraviolet spectrometer 8;Ultraviolet monitoring sensor 7 is arranged in the inside of second container and is connected with ultraviolet spectrometer 8, specifically, ultraviolet monitoring sensor 7 is inserted into the liquid surface below the liquid in second container, for monitoring the release content change of solid corrosion inhibitor in solution;First container and second container are connected by glass pipeline, second container contains corrosion medium containing corrosion inhibitor treated by 0.22 micrometer filter membrane 2.

[0027] Wherein, hydrogen sensor 1 can measure the change value of H2 concentration in first container before and after reaction, for reading the change of gas concentration in first container, the corrosion rate of reaction system is calculated by the change value of gas concentration, and its reading is accurate to 0.1mg / cm³.First container and second container are cylindrical shape, and have acid resistance, alkali resistance and pressure resistance.

[0028] In view of the defects and improvement needs of prior art, the utility model aims at providing a kind of quick and intuitive metal corrosion rate and corrosion inhibitor release rate detection device, by the structure and its setting mode of its key components, and the corresponding corrosion rate monitoring mechanism etc., compared with prior art, can effectively solve a series of problems, such as cumbersome operation steps, long time-consuming of corrosion monitoring method, and the device is convenient to carry, reaction is intuitive, can be applied in real time to detect the corrosion rate of metal in acidic medium and the release rate of solid corrosion inhibitor in situ.The above-mentioned device for monitoring solid corrosion inhibitor release condition and corrosion inhibition performance in acidic medium is to utilize the characteristics that hydrogen is generated in the corrosion reaction of metal in acidic solution, so as to judge the degree of metal corrosion according to the volume of generated gas.0.22 micrometer filter membrane 2 is used to isolate impurity component, and then portable ultraviolet spectrometer 8 is used to monitor the change of corrosion inhibitor concentration in evaluation system.

[0029] The device for monitoring the release and inhibition performance of solid corrosion inhibitor in acidic medium comprises a cylindrical container (a first container and a second container), a sealed plug 3 with a hook, the hook being a glass hook 4, a hydrogen sensor 1, a 0.22-micron filter membrane 2, an ultraviolet monitoring sensor 7, a portable ultraviolet spectrometer 8, and other key components.

[0030] The cylindrical container (the first container and the second container) is used for containing the corrosion medium and the solid corrosion inhibitor 6. The container has acid resistance, corrosion resistance and pressure resistance, ensuring the stability and safety of the experiment process. The bottom of the first container is provided with an opening, and the bottom opening is provided with a 0.22-micron filter membrane 2, which effectively isolates impurities in the corrosion evaluation system and ensures the accuracy of the experimental results, so that the release content change of the solid corrosion inhibitor 6 in the solution can be monitored by the ultraviolet monitoring sensor 7.

[0031] The hook is used for suspending a test steel sheet 5, and the sealed plug 3 is used for sealing the first container to form a closed environment in the first container. The hook is made of glass and is tightly connected with the sealed plug 3, so that leakage is avoided during the experiment.

[0032] The bottom of the hydrogen sensor 1 is inserted into the first container, but the bottom does not contact the liquid medium. The hydrogen sensor 1 is used for monitoring the change of H2 concentration in the system before and after the experiment, and the corrosion rate of the reaction system is calculated by the change value of the sensor reading. The hydrogen sensor 1 can accurately measure the change value of H2 concentration in the container before and after the reaction, and the reading is accurate to 0.1 mg / cm³.

[0033] The corrosion medium in the first container is transported to the second container through the filter membrane 2 arranged at the outlet of the bottom and the glass pipeline between the first container and the second container, and the release content change of the solid corrosion inhibitor 6 in the solution is monitored by the ultraviolet spectrum sensor 7. The ultraviolet spectrum sensor 7 is connected with the portable ultraviolet spectrometer 8, realizing real-time monitoring and data recording.

[0034] Since the metal reacts with H + to produce H2 in the acidic medium, the increase value of hydrogen concentration is read by the H2 sensor, and then the hydrogen production amount can be calculated. The corrosion amount of the metal is proportional to the hydrogen production amount, and the change value of the hydrogen sensor reading before and after the reaction can be compared to quickly detect the dynamic change of the corrosion condition.

[0035] The working process of the device is as follows:

[0036] The process of corrosion rate monitoring is as follows: a certain volume of acidic medium solution is measured by a measuring cylinder and added into the first container, and the volume of the gas is the total volume of the first container minus the volume of the liquid. The steel sheet 5 for testing is hung on the glass hook 4 and placed in the acidic solution, and the sealing plug 3 is quickly plugged and sealed. The value displayed by the hydrogen sensor 1 is read, and after a reaction time, the value displayed by the hydrogen sensor 1 is read again. The difference between the two readings is the change of the hydrogen concentration in the corrosion system, and the amount of substance of hydrogen is calculated according to Δm=Δρ·v and Δn=Δm / M, so that the corrosion rate of the corresponding steel sheet is obtained.

[0037] The known reaction equation is Fe+2H+=Fe²⁺+H2, and the amount of substance of Fe consumed in the reaction is equal to the amount of substance of H2, so that the weight loss of Fe can be calculated, and the corrosion rate is determined.

[0038] The process of solid corrosion inhibitor release rate monitoring is as follows: after the impurity components in the corrosion evaluation system are effectively isolated by the 0.22-micron filter membrane 2, the release content change of the solid corrosion inhibitor 6 in the solution contained in the second container is monitored by using the ultraviolet spectrum sensor 7 of the portable ultraviolet spectrum tester. According to the data recording and analysis of the ultraviolet spectrometer 8, the release rate of the solid corrosion inhibitor and the corrosion inhibition performance can be judged.

[0039] The utility model discloses a kind of metal corrosion rate detection devices, which is characterized by the following: the first container is used to contain acidic medium solution, and the second container is used to contain solid corrosion inhibitor; the hydrogen sensor 1 is used to monitor the change of hydrogen concentration in the corrosion system; the steel sheet 5 is used to simulate the metal in acidic medium; the glass hook 4 is used to hang the steel sheet 5; the sealing plug 3 is used to seal the first container; the 0.22-micron filter membrane 2 is used to isolate impurity components; the ultraviolet spectrum sensor 7 is used to monitor the release content change of the solid corrosion inhibitor 6; the ultraviolet spectrometer 8 is used to record and analyze the data of the ultraviolet spectrum sensor 7.

[0040] In view of the defects and improvement needs of the prior art, the utility model aims at providing a kind of quick and intuitive metal corrosion rate and corrosion inhibitor release rate detection device, wherein the structure of its key components and its setting mode, and the corresponding corrosion rate monitoring mechanism are improved, compared with prior art, can effectively solve a series of problems, such as the cumbersome operation steps and long time consumption of corrosion monitoring method, and the device is convenient to carry, and the reaction is intuitive, which can be used in real time to detect the corrosion rate of metal in acidic medium and the release rate of solid corrosion inhibitor.

[0041] The utility model has the advantages of simple device, low cost, easy operation and intuitive reaction, and is suitable for monitoring of metal corrosion rates in various occasions.

[0042] The content is only for explaining the technical idea of the utility model, and cannot limit the protection scope of the utility model. Any modification made on the basis of the technical scheme according to the technical idea of the utility model falls within the protection scope of the utility model claim.

Claims

1. A device for monitoring the release and corrosion inhibition performance of a solid corrosion inhibitor in an acidic medium, characterized in that: The invention comprises a first container, wherein a hydrogen sensor (1) is provided through the top cover of the first container, an opening is provided on the top cover of the first container, a sealing plug (3) is provided at the opening, the sealing plug (3) is connected to a hook, the bottom of the hook is connected to a metal sheet to be tested, and the first container is connected to a solid corrosion inhibitor release rate test device.

2. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 1, characterized in that: An outlet is provided on the bottom side wall of the first container, and the outlet is connected to a solid corrosion inhibitor release rate testing device.

3. The device for monitoring the release and corrosion inhibition performance of a solid corrosion inhibitor in an acidic medium according to claim 1 or 2, characterized in that: The solid corrosion inhibitor release rate testing device comprises an ultraviolet monitoring sensor (7), a second container, and an ultraviolet spectrometer (8); the ultraviolet monitoring sensor (7) is arranged inside the second container and connected to the ultraviolet spectrometer (8).

4. The device for monitoring the release and corrosion inhibition performance of a solid corrosion inhibitor in an acidic medium according to claim 3, characterized in that: The ultraviolet monitoring sensor (7) extends below the liquid surface of the liquid in the second container.

5. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 3, characterized in that: The first container and the second container are connected by a glass pipe.

6. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 2, characterized in that: A filter membrane (2) is provided at the outlet, and the filter membrane (2) is used to isolate impurity components.

7. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 6, characterized in that: The filter membrane (2) is a 0.22 micron filter membrane.

8. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 1, characterized in that: The bottom of the hydrogen sensor (1) passes through the top cover of the first container.

9. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 1, characterized in that: The bottom of the hydrogen sensor (1) is located above the liquid medium in the first container and is used to read changes in gas concentration in the first container.

10. The device for monitoring the release and corrosion inhibition performance of solid corrosion inhibitors in acidic media according to claim 1, characterized in that: The hook is a glass hook (4).

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