Experimental device and method for researching wall surface infiltration characteristics of corrosion inhibitor

Abstract

The invention discloses an experimental device and method for researching the wall surface infiltration characteristic of a corrosion inhibitor, and solves the technical problems that how the corrosion inhibitor interacts with a wall surface material and how the protection effect of the corrosion inhibitor is influenced cannot be accurately known in the prior art. The device comprises an experiment module external connection pipe, an experiment module and an experiment injection agent guide pipe, an installation groove is formed in the experiment module, the experiment module external connection pipe is installed at the two ends of the experiment module, an injection agent guide pipe inlet is formed in one end of the experiment injection agent guide pipe, the other end of the experiment injection agent guide pipe is arranged in the experiment module, and the injection agent guide pipe inlet is formed outside the experiment module. The corrosion inhibitor is arranged in the experiment module, injection of the corrosion inhibitor is controlled through the switch valve, a through hole is formed in the experiment module, a plug matched with the through hole is arranged, and a supporting assembly and an angle adjusting assembly are further arranged at the bottom of the experiment module. According to the invention, the infiltration characteristics of the corrosion inhibitor and the interaction between the corrosion inhibitor and the protected wall surface can be accurately observed and recorded, and the accuracy and reliability of the experiment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion protection, and in particular to an experimental device and method for studying the wall wetting characteristics of a corrosion inhibitor. Background Art

[0002] In the field of corrosion protection, corrosion inhibitors are widely used and of vital importance. They are designed to slow down or prevent the corrosion rate of metals or other materials in corrosive environments. However, the effectiveness of corrosion inhibitors depends largely on their interaction with the surface material to be protected, especially their wetting properties. The wetting properties describe the contact and spreading behavior between the liquid (in this case, the corrosion inhibitor) and the solid surface (the surface material), which is crucial for the corrosion inhibitor to effectively cover and protect the surface.

[0003] Although the importance of corrosion inhibitors in corrosion protection has been widely recognized, the research on the wetting characteristics between corrosion inhibitors and protected wall materials is relatively lagging. At present, some existing patents mainly focus on the preparation method of corrosion inhibitors, mixing devices and performance improvement of corrosion inhibitors themselves. Although these patents provide certain technical support for the application of corrosion inhibitors, they do not involve the research on the wetting characteristics between corrosion inhibitors and protected wall materials.

[0004] Specifically, existing patents and technical literature lack devices and methods for basic experimental research on the wetting characteristics and adsorption effects between corrosion inhibitor droplets and different wall materials. This means that when evaluating the performance of corrosion inhibitors, we often cannot accurately understand how the corrosion inhibitors interact with the wall materials and how this interaction affects the protective effect of the corrosion inhibitors.

[0005] Therefore, in order to fill this research gap, the present invention proposes an experimental device and method that can be used to study the wetting characteristics between commonly used corrosion inhibitor droplets and different wall material surfaces in the presence of medium corrosion. The device and method are intended to provide a comprehensive and accurate experimental platform to deeply study the interaction mechanism between the corrosion inhibitor and the protected wall material, and provide a scientific basis for the performance evaluation and optimization of the corrosion inhibitor. Summary of the invention

[0006] The purpose of the present invention is to provide an experimental device and method for studying the wall wetting characteristics of a corrosion inhibitor, so as to solve the technical problem that the prior art cannot accurately understand how the corrosion inhibitor interacts with the wall material and how this interaction affects the protective effect of the corrosion inhibitor.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In the first aspect, the present invention provides an experimental device for studying the wall wetting characteristics of corrosion inhibitors, including an external pipe of an experimental cabin, an experimental cabin and an experimental injection conduit. The experimental cabin is provided with installation grooves for installing different test pieces, and the external pipe of the experimental cabin is installed at both ends of the experimental cabin. One end of the experimental injection conduit is provided with an injection conduit inlet, and the other end passes through the experimental cabin and is arranged inside the experimental cabin. The injection conduit inlet is arranged outside the experimental cabin, and the injection of corrosion inhibitor is controlled by a switch valve. The experimental cabin is provided with at least one through hole for exhausting or injecting a medium, and is provided with a plug matching the through hole. The bottom of the experimental cabin is also provided with a support assembly and an angle adjustment assembly.

[0009] Furthermore, the experimental chamber is connected to an external pipe of the experimental chamber via a reducer to accommodate simulated experimental medium pipes of different diameters.

[0010] Furthermore, an experimental injection sealing ring is provided at the connection portion between the experimental chamber and the experimental injection conduit to ensure that the corrosion inhibitor does not leak during the injection process.

[0011] Furthermore, the support assembly includes a base, and the base is connected to the bottom of one end of the experimental cabin through a support member.

[0012] Furthermore, the angle adjustment assembly includes an angle ruler, a hinge, and a locking knob. The base is connected to the bottom of the other end of the experimental cabin through a hinge. The inclination angle of the experimental cabin is adjusted by the angle ruler and fixed by the locking knob.

[0013] Furthermore, it also includes a blind end sealing plate, which is arranged between the experimental chamber and the reducer to facilitate sealing the experimental chamber.

[0014] In a second aspect, the present invention provides an experimental method for studying the wall wetting characteristics of a corrosion inhibitor, comprising the following two experimental states: when in a pipe flow state, comprising the following steps:

[0015] A1. Connect the experimental device: connect the external pipe of the experimental cabin to the test pipeline to pass the simulated experimental medium, block the through hole to seal the experimental cabin, and install the experimental specimen in the specimen installation groove;

[0016] A2. Adding corrosion inhibitor: inject the corrosion inhibitor into the experimental chamber through the injection conduit inlet, use the injection conduit switch valve to control the opening and closing of the conduit during the filling process, and control the position of the experimental injection conduit to control the position of the corrosion inhibitor filling;

[0017] A3. Set experimental conditions: According to the experimental requirements, adjust the inclination angle of the experimental chamber and fix it with the locking knob. According to the experimental requirements, replace the test pieces with different materials, surface roughness, and adsorption force;

[0018] A4. Under the condition of simulating medium flow, observe the wetting characteristics of corrosion inhibitor droplets in the experimental chamber, record the wetting characteristics of the corrosion inhibitor, observe the interaction between the corrosion inhibitor and the protected wall surface, and the influence of different working conditions on the wetting characteristics;

[0019] When in the static analysis state, the following steps are included:

[0020] B1. Connect the experimental device: directly install the blind end sealing plates at both ends of the experimental cabin to seal the cabin. When injecting the medium, inject the medium into the cabin through the through hole, and then seal the cabin by plugging.

[0021] B2. Adding corrosion inhibitor: inject the corrosion inhibitor into the experimental chamber through the inlet of the injection conduit, use the injection conduit switch valve to control the opening and closing of the conduit during the filling process, and control the position of the experimental injection conduit to control the position of the corrosion inhibitor filling;

[0022] B3. Set experimental conditions: According to the experimental requirements, adjust the inclination angle of the experimental chamber and fix it with the locking knob. According to the experimental requirements, replace the test pieces with different materials, surface roughness, and adsorption force;

[0023] B4. Under static conditions, observe the wetting characteristics of the corrosion inhibitor droplets in the experimental chamber, record the wetting characteristics of the corrosion inhibitor, observe the interaction between the corrosion inhibitor and the protected wall surface, and the influence of different working conditions on the wetting characteristics.

[0024] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0025] (1) The experimental device for studying the wall wetting characteristics of the corrosion inhibitor provided by the present invention can simulate the corrosion inhibitor wetting process under different working conditions. By changing factors such as the wall material, surface roughness, adsorption force, tilt angle, medium temperature, etc., the wetting characteristics of the corrosion inhibitor and the interaction between the corrosion inhibitor and the protected wall surface can be accurately observed and recorded. This greatly improves the accuracy and reliability of the experiment.

[0026] (2) The experimental device and method for studying the wall wetting characteristics of corrosion inhibitors provided by the present invention are specifically used to study the wetting characteristics between corrosion inhibitor droplets and the surfaces of different wall materials. This fills the gap in the current research on the wetting characteristics between corrosion inhibitors and protected wall materials, and provides a scientific basis for the performance evaluation and optimization of corrosion inhibitors. The experimental device and method of the present invention are not only suitable for specific fields such as shale gas horizontal well casings, but can also be widely used in other occasions that require corrosion protection. By in-depth research on the interaction mechanism between corrosion inhibitors and protected wall materials, it can provide strong technical support for the development and application of corrosion inhibitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of the overall structure of the experimental cabin of the present invention;

[0029] Figure 2 It is a side view of the overall structure of the experimental cabin of the present invention;

[0030] Figure 3 It is a side view of the cabin structure of the experimental cabin of the present invention;

[0031] Figure 4 It is a top view of the main body of the experimental cabin of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the blind end sealing plate of the present invention.

[0033] In the figure: 1-external pipe of the experimental cabin; 2-reducing joint; 3-experimental cabin; 4-experimental injection sealing ring; 5-experimental injection conduit; 6-inlet of the injection conduit; 7-switch valve; 8-blocking; 9-through hole; 10-installation groove; 11-base; 12-support member; 13-angle ruler; 14-hinge; 15-locking knob; 16-blind end sealing plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Example 1

[0036] An experimental device for studying the wall wetting characteristics of a corrosion inhibitor comprises an external pipe 1 of an experimental cabin, an experimental cabin 3 and an experimental injection conduit 5. The experimental cabin 3 is provided with a mounting groove 10 for mounting different test pieces. The test pieces are processed into suitable sizes and are interference fit with the mounting groove 10. The external pipe 1 of the experimental cabin is installed at both ends of the experimental cabin 3. An injection conduit inlet 6 is provided at one end of the experimental injection conduit 5, and the other end passes through the experimental cabin 3 and is arranged inside the experimental cabin 3. The injection conduit inlet 6 is arranged outside the experimental cabin 3, and the injection of the corrosion inhibitor is controlled by a switch valve 7. The experimental cabin 3 is provided with at least one through hole 9 for exhausting air or injecting a medium, and is provided with a plug 8 matching the through hole 9.

[0037] In this embodiment, in order to adapt to the simulated experimental medium pipelines with different diameters, the experimental chamber 3 is connected to the experimental chamber external pipe 1 through a reducer 2.

[0038] In this embodiment, in order to ensure that the corrosion inhibitor does not leak during the injection process, an experimental injection sealing ring 4 is provided at the connection between the experimental chamber 3 and the experimental injection conduit 5 .

[0039] Example 2

[0040] The technical features in this embodiment are basically the same as the technical features described in Embodiment 1. The same technical features and technical solutions will not be repeated here. Only the differences between Embodiment 2 and Embodiment 1 are described here.

[0041] like Figure 1-Figure 4 As shown, in order to better support the experimental cabin and better adjust the position of the experimental cabin during the experiment, a support assembly and an angle adjustment assembly are also provided at the bottom of the experimental cabin 3. The support assembly includes a base 11, and the base 11 is connected to the bottom of one end of the experimental cabin 3 through a support member 12. The angle adjustment assembly includes an angle ruler 13, a hinge 14, and a locking knob 15. The base 11 is connected to the bottom of the other end of the experimental cabin 3 through the hinge 14. The tilt angle of the experimental cabin 3 is adjusted by the angle ruler 13 and fixed by the locking knob 15.

[0042] In this embodiment, the test piece is fixed in the installation groove 10 by gluing the contact surface.

[0043] Example 3

[0044] The technical features in this embodiment are basically the same as the technical features described in Example 2. The same technical features and technical solutions will not be repeated here. Only the differences between Example 3 and Example 2 are described here.

[0045] like Figure 1-Figure 5 As shown, in order to observe and analyze the wetting characteristics of the corrosion inhibitor when stationary, a blind end sealing plate 16 is also included. The blind end sealing plate 16 is arranged between the experimental chamber 3 and the reducer 2 to facilitate sealing the left and right sides of the experimental chamber 3.

[0046] Example 4

[0047] An experimental method for studying the wall wetting characteristics of a corrosion inhibitor includes the following two experimental conditions:

[0048] When in pipe flow state, the following steps are included:

[0049] A1. Connect the experimental device: connect the external pipe of the experimental cabin to the test pipeline to pass the simulated experimental medium, block the through hole to seal the experimental cabin, and install the experimental specimen in the specimen installation groove;

[0050] A2. Adding corrosion inhibitor: inject the corrosion inhibitor into the experimental chamber through the injection conduit inlet, use the injection conduit switch valve to control the opening and closing of the conduit during the filling process, and control the position of the experimental injection conduit to control the position of the corrosion inhibitor filling;

[0051] A3. Set experimental conditions: According to the experimental requirements, adjust the inclination angle of the experimental chamber and fix it with the locking knob. According to the experimental requirements, replace the test pieces with different materials, surface roughness, and adsorption force;

[0052] A4. Under the condition of simulating medium flow, observe the wetting characteristics of corrosion inhibitor droplets in the experimental chamber, record the wetting characteristics of the corrosion inhibitor, observe the interaction between the corrosion inhibitor and the protected wall surface, and the influence of different working conditions on the wetting characteristics;

[0053] When in the static analysis state, the following steps are included:

[0054] B1. Connect the experimental device: directly install the blind end sealing plates at both ends of the experimental cabin to seal the cabin. When injecting the medium, inject the medium into the cabin through the through hole, and then seal the cabin by plugging.

[0055] B2. Adding corrosion inhibitor: inject the corrosion inhibitor into the experimental chamber through the inlet of the injection conduit, use the injection conduit switch valve to control the opening and closing of the conduit during the filling process, and control the position of the experimental injection conduit to control the position of the corrosion inhibitor filling;

[0056] B3. Set experimental conditions: According to the experimental requirements, adjust the inclination angle of the experimental chamber and fix it with the locking knob. According to the experimental requirements, replace the test pieces with different materials, surface roughness, and adsorption force;

[0057] B4. Under static conditions, observe the wetting characteristics of the corrosion inhibitor droplets in the experimental chamber, record the wetting characteristics of the corrosion inhibitor, observe the interaction between the corrosion inhibitor and the protected wall surface, and the influence of different working conditions on the wetting characteristics.

[0058] The present invention can install a test piece in the installation groove to cause corrosion with the medium, and at the same time test the weight loss, surface corrosion depth, surface morphology, etc. of the test piece before and after the experiment. The corrosion rate, corrosion resistance of the material and the effect of the corrosion inhibitor can be evaluated according to the corrosion conditions through weighing, scanning electron microscopy, surface morphology scanner, etc.

[0059] The present invention simulates the pipe flow state and the static analysis state, connects the blind end sealing plate under static conditions, focuses on observing the adsorption morphology of the corrosion inhibitor, and can carry out static corrosion experiments on the test piece; connects the pipeline under the pipe flow state (dynamic), focuses on observing the influence of the flowing medium on the adsorption of the corrosion inhibitor, and can carry out flow corrosion and corrosion inhibitor protection effect evaluation research under the flow state.

[0060] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An experimental device for studying the wall wetting characteristics of corrosion inhibitors, characterized in that: The invention comprises an external pipe (1) for an experimental chamber, an experimental chamber (3) and an experimental injection conduit (5); the experimental chamber (3) is provided with an installation groove (10) for installing different test pieces; the external pipe (1) for the experimental chamber is installed at both ends of the experimental chamber (3); one end of the experimental injection conduit (5) is provided with an injection conduit inlet (6); the other end passes through the experimental chamber (3) and is arranged inside the experimental chamber (3); the injection conduit inlet (6) is arranged outside the experimental chamber (3) and the injection of the corrosion inhibitor is controlled by a switch valve (7); the experimental chamber (3) is provided with at least one through hole (9) for exhausting or injecting a medium, and is provided with a plug (8) matched with the through hole (9); the bottom of the experimental chamber (3) is also provided with a support component and an angle adjustment component.

2. The experimental device for studying the wall wetting characteristics of corrosion inhibitor according to claim 1, characterized in that: The experimental chamber (3) is connected to the experimental chamber external pipe (1) via a reducer (2) to accommodate simulated experimental medium pipes of different diameters.

3. The experimental device for studying the wall wetting characteristics of the corrosion inhibitor according to claim 1, characterized in that: The connection between the experimental chamber (3) and the experimental injection conduit (5) is provided with an experimental injection sealing ring (4) to ensure that the corrosion inhibitor does not leak during the injection process.

4. The experimental device for studying the wall wetting characteristics of corrosion inhibitor according to claim 1, characterized in that: The support assembly comprises a base (11), and the base (11) is connected to the bottom of one end of the experimental cabin (3) through a support member (12).

5. The experimental device for studying the wall wetting characteristics of corrosion inhibitor according to claim 4, characterized in that: The angle adjustment assembly comprises an angle ruler (13), a hinge (14), and a locking knob (15); the base (11) is connected to the bottom of the other end of the experimental cabin (3) via the hinge (14); the inclination angle of the experimental cabin (3) is adjusted via the angle ruler (13) and is fixed via the locking knob (15).

6. The experimental device for studying the wall wetting characteristics of corrosion inhibitor according to claim 2, characterized in that: It also comprises a blind end sealing plate (16), wherein the blind end sealing plate (16) is arranged between the experimental chamber (3) and the reducer (2) to facilitate sealing of the experimental chamber (3).

7. An experimental method for studying the wall wetting characteristics of a corrosion inhibitor, characterized in that: There are two experimental states: When in pipe flow state, the following steps are included: A1. Connect the experimental device: connect the external pipe of the experimental cabin to the test pipeline to pass the simulated experimental medium, block the through hole to seal the experimental cabin, and install the experimental specimen in the specimen installation groove; A2. Adding corrosion inhibitor: inject the corrosion inhibitor into the experimental chamber through the injection conduit inlet, use the injection conduit switch valve to control the opening and closing of the conduit during the filling process, and control the position of the experimental injection conduit to control the position of the corrosion inhibitor filling; A3. Set experimental conditions: According to the experimental requirements, adjust the inclination angle of the experimental chamber and fix it with the locking knob. According to the experimental requirements, replace the test pieces with different materials, surface roughness, and adsorption force; A4. Under the condition of simulating medium flow, observe the wetting characteristics of corrosion inhibitor droplets in the experimental chamber, record the wetting characteristics of the corrosion inhibitor, observe the interaction between the corrosion inhibitor and the protected wall surface, and the influence of different working conditions on the wetting characteristics; When in the static analysis state, the following steps are included: B1. Connect the experimental device: directly install the blind end sealing plates at both ends of the experimental cabin to seal the cabin. When injecting the medium, inject the medium into the cabin through the through hole, and then seal the cabin by plugging. B2. Adding corrosion inhibitor: inject the corrosion inhibitor into the experimental chamber through the inlet of the injection conduit, use the injection conduit switch valve to control the opening and closing of the conduit during the filling process, and control the position of the experimental injection conduit to control the position of the corrosion inhibitor filling; B3. Set experimental conditions: According to the experimental requirements, adjust the inclination angle of the experimental chamber and fix it with the locking knob. According to the experimental requirements, replace the test pieces with different materials, surface roughness, and adsorption force; B4. Under static conditions, observe the wetting characteristics of the corrosion inhibitor droplets in the experimental chamber, record the wetting characteristics of the corrosion inhibitor, observe the interaction between the corrosion inhibitor and the protected wall surface, and the influence of different working conditions on the wetting characteristics.

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