CN111965100A - Online nondestructive time-space resolution monitoring method and device for corrosion in pipeline - Google Patents
Online nondestructive time-space resolution monitoring method and device for corrosion in pipeline Download PDFInfo
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- CN111965100A CN111965100A CN202010806582.8A CN202010806582A CN111965100A CN 111965100 A CN111965100 A CN 111965100A CN 202010806582 A CN202010806582 A CN 202010806582A CN 111965100 A CN111965100 A CN 111965100A
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Abstract
The invention discloses an online nondestructive space-time resolution monitoring device for corrosion in a pipeline, which at least comprises a clamp, an electrochemical sensor and an electrochemical workstation, wherein the electrochemical sensor is electrically connected with the electrochemical workstation, and the electrochemical sensor is fixed on the outer wall of the pipeline to be tested through the clamp. The device utilizes an external electrochemical workstation to detect the metal material corrosion in-situ electrochemical signal, tests the potential distribution diagram, the current distribution diagram and the space charge layer thickness distribution diagram of different regions at different time are carried out, and the time-space resolution monitoring of the corrosion in the pipeline is realized.
Description
Technical Field
The invention belongs to the field of corrosion and protection of oil and gas fields, and particularly relates to a method and a device for space-time resolution monitoring of corrosion in a pipeline under a high-temperature high-pressure high-hydrogen sulfide environment.
Background
With the development of oil and gas fields, the corrosive environment is more and more severe, and more oil and gas pipes are at high temperature, high pressure and high H content2S environment. High-temperature, high-pressure and high-H content exposure of carbon steel or low-alloy steel2In the environment medium of S, besides the FeS film formed on the surface, hydrogen generated by corrosion intrudes into steel to cause hydrogen induced cracking, hydrogen bubbling is observed on the surface of steel, and sulfide stress corrosion cracking occurs under stress.
Nowadays, electrochemical test method is commonly adopted at home and abroad for H2S environmental corrosion law is studied, but at present, the commonly used three-electrode system electrochemical testing device at home and abroad adopts an integrally formed alloy or glass container. For example, chinese invention authorization publication No.: CN104568726A discloses a high temperature high pressure corrosion hydrogen permeation dynamics testing arrangement andthe invention provides a test method, which provides a fracture form of a material under the coupling action of corrosion hydrogen permeation and fatigue load at high temperature and high pressure, can test the fatigue load of the material in a short time, and has the defect that the space and time online monitoring cannot be realized at high temperature and high pressure. Chinese invention authorization publication No.: CN105699285A discloses an electrochemical device for elemental sulfur under-deposit corrosion testing, which improves a traditional integrally-formed alloy electrochemical testing device, and a working electrode jack is arranged on a lower cover, and a working electrode penetrates through the working electrode jack from bottom to top, so that a scale sample can be conveniently fixed on the working electrode. The defect of the patent is that the sample is in a state after being corroded by the elemental sulfur scale, and the corrosion process of the sample cannot be monitored in real time.
The online corrosion monitoring means for oil and gas pipelines in the petroleum industry mainly comprises an electrochemical alternating current impedance probe, a resistance probe, an inductance probe and the like. When in use, the corrosion monitoring device has certain limitations and is suitable for normal temperature and pressure, but in actual industrial corrosion monitoring, pipeline corrosion monitoring in high-temperature and high-pressure environment has disadvantages. Such as: the electrochemical alternating-current impedance probe has a wide frequency range of alternating-current impedance test, so that the time required in the test process is long, and the real-time corrosion state is difficult to reflect; the resistance probe is greatly influenced by interference factors such as temperature and the like; the corrosion monitoring result of the inductance probe is also influenced by the temperature, mainly because the temperature influences the magnetic permeability of the steel material; the corrosion monitoring of the inner wall of the pipeline in time and space can not be realized.
In view of the above, when monitoring corrosion on line in petrochemical, metal processing and smelting industries, there is a trend to avoid possible risks by using a non-destructive monitoring method, and therefore, what means and what device are adopted to realize high-temperature, high-pressure and high-H content2The corrosion monitoring of S pipelines in time and space is an urgent problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an online nondestructive space-time resolution monitoring device for corrosion in a pipeline.
The purpose of the invention is realized by the following technical scheme:
an online nondestructive space-time resolution monitoring device for corrosion in a pipeline at least comprises a clamp, an electrochemical sensor and an electrochemical workstation, wherein the electrochemical sensor is electrically connected with the electrochemical workstation and is fixed on the outer wall of the pipeline to be tested through the clamp; the electrochemical sensor includes at least: the device comprises a three-electrode lead, a capillary reference electrode, a capillary auxiliary electrode, micro-tubes and a copper bar, wherein one end part of the copper bar is connected with a pipeline serving as a working electrode, a plurality of micro-tubes are arranged in the copper bar, the capillary reference electrode and the capillary auxiliary electrode are arranged in the micro-tubes, the micro-tubes are filled with electrolyte, and the electrolyte is in contact with the outer wall of the pipeline to be tested; one end of the three-electrode lead is respectively connected with the capillary reference electrode, the capillary auxiliary electrode and the copper bar, and the other end of the three-electrode lead is connected with the electrochemical workstation.
According to a preferred embodiment, the monitoring device further comprises a calculation processing unit configured to complete the recording, analysis processing and output of the electrochemical signal data of the capillary reference electrode, the capillary auxiliary electrode and the working electrode.
According to a preferred embodiment, the end of the copper rod connected with the pipeline is provided with a groove structure matched with the outer wall of the pipeline.
According to a preferred embodiment, the axis of the microtube is arranged parallel to the axis of the copper rod; and the capillary reference electrode and the capillary auxiliary electrode are arranged along the axis direction of the micro-tube.
According to a preferred embodiment, an electrochemical sensor shell is arranged on the outer side of the side wall of the copper rod, and an electrochemical sensor front cover is arranged at the end part of the copper rod in the direction.
According to a preferred embodiment, the electrochemical sensor housing is a hastelloy casing; and an insulating filling material is arranged between the electrochemical sensor shell and the copper bar.
According to a preferred embodiment, the three-electrode lead is connected to an electrochemical workstation through a central hole in the front cover of the electrochemical sensor.
According to a preferred embodiment, the clamp is made of an insulating material.
An online nondestructive space-time resolution monitoring method for corrosion in a pipeline, which comprises the following steps: the method comprises the following steps: finishing the polishing and cleaning treatment of the outer wall of the pipeline to be tested; step two: tightly contacting the electrochemical sensor with the outer wall of the pipeline by using a clamp; step three: connecting a three-electrode lead wire in the electrochemical sensor with an external electrochemical workstation, receiving a signal, and starting to perform experimental test; step four: connecting a peripheral computing processing unit with an external electrochemical workstation, and recording, analyzing, processing and outputting data acquired by the electrochemical workstation; step five: according to the conditions of the required simulated field working conditions, experimental corrosion media, temperature and pressure conditions are designed, and the in-situ electrochemical test is started, so that potential distribution maps, current distribution maps and space charge layer thickness distribution maps of different areas at different times are obtained, and the time-space resolution monitoring of the corrosion in the pipeline is realized.
The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
The invention has the beneficial effects that: the device and the method of the invention are used for detecting the corrosion in-situ electrochemical signal of the metal material, testing the potential distribution diagram, the current distribution diagram and the thickness distribution diagram of the space charge layer in different areas at different time, and realizing the time-space resolution monitoring of the corrosion in the pipeline.
Drawings
FIG. 1 is a schematic structural diagram of an online nondestructive space-time resolution monitoring device for corrosion in a pipeline according to the present invention;
FIG. 2 is a schematic structural diagram of an electrochemical sensor in the online nondestructive space-time resolution monitoring device for corrosion in a pipeline of the invention;
FIG. 3 is a schematic cross-sectional structure diagram of an electrochemical sensor in the online nondestructive space-time resolution monitoring device for corrosion in a pipeline of the invention;
FIG. 4 is a schematic diagram of the structure of the clamp in the online nondestructive space-time resolution monitoring device for corrosion in the pipeline.
The electrochemical sensor comprises a 1-three-electrode lead, a 2-electrochemical sensor front cover, a 3-capillary reference electrode, a 4-capillary auxiliary electrode, a 5-micro tube, a 6-copper rod, a 7-electrochemical sensor shell, an 8-clamp, a 9-pipeline, a 10-bolt and an 11-nut.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that, in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations and positional relationships that are conventionally used in the products of the present invention, and are used merely for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, it should be noted that, in the present invention, if the specific structures, connection relationships, position relationships, power source relationships, and the like are not written in particular, the structures, connection relationships, position relationships, power source relationships, and the like related to the present invention can be known by those skilled in the art without creative work on the basis of the prior art.
Example 1:
referring to fig. 1 to 4, the invention discloses an online nondestructive space-time resolution monitoring device for corrosion in a pipeline.
Preferably, the monitoring device comprises at least a clamp 8, an electrochemical sensor and an electrochemical workstation. The electrochemical sensor is electrically connected with the electrochemical workstation, and the electrochemical sensor is fixed on the outer wall of the pipeline to be tested 9 through the clamp 8.
Preferably, the clamp is of an 8-position clamp type structure. And the clamp 8 is fastened by using a bolt 9 and a nut 10. The electrochemical sensor is tightly coupled to the pipe 9 to be tested via the clamp 8. Further, the jig 8 is made of an insulating material.
And detecting the corrosion in-situ electrochemical signal of the metal material by using an external electrochemical workstation, testing a potential distribution diagram, a current distribution diagram and a space charge layer thickness distribution diagram of different regions at different time, and realizing the space-time resolution monitoring of the corrosion in the pipeline.
Preferably, the monitoring device further comprises a calculation processing unit configured to complete the recording, analysis processing and output of electrochemical signal data of the capillary reference electrode 3, the capillary auxiliary electrode 4 and the working electrode. The computing processing unit includes, but is not limited to, a computer.
Preferably, the electrochemical sensor comprises at least: three-electrode lead 1, capillary reference electrode 3, capillary auxiliary electrode 4, micropipe 5 and copper bar 6.
Preferably, one end of the copper bar 6 is connected with a pipeline 9 as a working electrode, and a plurality of micro-pipes 5 are arranged in the copper bar 6. And a groove structure matched with the outer wall of the pipeline 9 is arranged at the connecting end of the copper rod 6 and the pipeline 9.
Preferably, the capillary reference electrode 3 and the capillary auxiliary electrode 4 are disposed in the micro tube 5, and the micro tube 5 is filled with an electrolyte. The electrolyte is in contact with the outer wall of the pipe 9.
Preferably, the axis of the microtube 5 is arranged parallel to the axis of the copper rod 6; and the capillary reference electrode 3 and the capillary auxiliary electrode 4 are arranged along the axial direction of the microtube 5.
Furthermore, a sealing gasket is arranged at the joint part of the electrochemical sensor microtube 5 and the test pipeline 9, so that the electrolyte inside the tube body can be tightly matched with the pipeline 9 to be tested. The working electrode area is the area of contact of the electrolyte with the outer wall of the tube 9.
Preferably, one end of the three-electrode lead 1 is respectively connected with the capillary reference electrode 3, the capillary auxiliary electrode 4 and the copper bar 6, and the other end is connected with the electrochemical workstation.
Preferably, an electrochemical sensor housing 7 is arranged on the outer side of the side wall of the copper bar 6, and an electrochemical sensor front cover 2 is arranged on the end part of the copper bar 6.
Further, the electrochemical sensor housing 7 is a hastelloy casing. And an insulating filling material is arranged between the electrochemical sensor shell 7 and the copper bar 6.
Preferably, the three-electrode lead 1 penetrates through a central hole on the front cover 2 of the electrochemical sensor to be connected with an electrochemical workstation.
Example 2
On the basis of the embodiment 1, the invention also discloses an online nondestructive space-time resolution monitoring method for corrosion in the pipeline.
The method comprises the following steps:
the method comprises the following steps: finishing the pre-polishing and cleaning treatment of the outer wall of the pipeline to be tested 9;
step two: the electrochemical sensor is tightly contacted with the outer wall of the pipeline 9 by a clamp 8;
step three: connecting a three-electrode lead 1 in the electrochemical sensor with an external electrochemical workstation, receiving a signal, and starting to perform experimental test;
step four: connecting a peripheral computing processing unit with an external electrochemical workstation, and recording, analyzing, processing and outputting data acquired by the electrochemical workstation;
step five: according to the required simulated field working condition, experimental corrosion medium, temperature and pressure conditions are designed, and the in-situ electrochemical test is started, so that potential distribution maps, current distribution maps and space charge layer thickness distribution maps of different regions at different time are obtained, and the time-space resolution monitoring of the corrosion in the pipeline 9 is realized.
Preferred embodiments of the present patent are described above in detail with reference to the accompanying drawings, but the present patent is not limited thereto. Within the scope of the technical idea of this patent, many simple modifications can be made to the technical solution of this patent, for example: the Mott-Schottky curve was tested for studying the semiconductor characteristics of the passivation film on the surface of the metal pipe.
The invention realizes high temperature, high pressure and high H content2The corrosion in the pipeline is monitored on line without damage in the S environment, the change conditions of the potential, the current and the space charge layer thickness in time and space can be obtained, and the high temperature, the high pressure and the high H can be mastered2And the corrosion behavior and mechanism in the pipeline are researched in the S environment, and the operation is convenient and effective.
The foregoing basic embodiments of the invention and their various further alternatives can be freely combined to form multiple embodiments, all of which are contemplated and claimed herein. In the scheme of the invention, each selection example can be combined with any other basic example and selection example at will. Numerous combinations will be known to those skilled in the art.
Claims (9)
1. The online nondestructive space-time resolution monitoring device for corrosion in the pipeline is characterized by at least comprising a clamp (8), an electrochemical sensor and an electrochemical workstation, wherein the electrochemical sensor is electrically connected with the electrochemical workstation and is fixed on the outer wall of a pipeline (9) to be tested through the clamp;
the electrochemical sensor includes at least: a three-electrode lead (1), a capillary reference electrode (3), a capillary auxiliary electrode (4), a micro-tube (5) and a copper bar (6),
one end of the copper bar (6) is connected with a pipeline (9) serving as a working electrode, a plurality of micro-tubes (5) are arranged in the copper bar (6), the capillary reference electrode (3) and the capillary auxiliary electrode (4) are arranged in the micro-tubes (5), the micro-tubes (5) are filled with electrolyte, and the electrolyte is in contact with the outer wall of the pipeline (9) to be tested;
one end of the three-electrode lead (1) is respectively connected with the capillary reference electrode (3), the capillary auxiliary electrode (4) and the copper bar (6), and the other end of the three-electrode lead is connected with the electrochemical workstation.
2. The online nondestructive space-time resolution monitoring device for corrosion in pipelines according to claim 1, characterized in that the monitoring device further comprises a calculation processing unit configured to complete the recording, analysis processing and output of electrochemical signal data of the capillary reference electrode (3), the capillary auxiliary electrode (4) and the working electrode.
3. The on-line nondestructive space-time resolution monitoring device for corrosion in a pipeline as claimed in claim 1, wherein the connecting end of the copper rod (6) and the pipeline (9) is provided with a groove structure matched with the outer wall of the pipeline (9).
4. The on-line nondestructive space-time resolution monitoring device for corrosion in pipelines according to claim 3, wherein the axis of the microtube (5) is arranged in parallel with the axis of the copper rod (6);
and the capillary reference electrode (3) and the capillary auxiliary electrode (4) are arranged along the axial direction of the micro tube (5).
5. The online nondestructive space-time resolution monitoring device for corrosion in a pipeline according to claim 4 is characterized in that an electrochemical sensor shell (7) is arranged on the outer side of the side wall of the copper rod (6), and an electrochemical sensor front cover (2) is arranged at the end part direction of the copper rod (6).
6. The online nondestructive space-time resolution monitoring device for corrosion in pipelines according to claim 5, characterized in that the electrochemical sensor housing (7) is a hastelloy shell;
and an insulating filling material is arranged between the electrochemical sensor shell (7) and the copper bar (6).
7. The online nondestructive space-time resolution monitoring device for corrosion in a pipeline as claimed in claim 5 is characterized in that the three-electrode lead (1) penetrates through a central hole on the front cover (2) of the electrochemical sensor and is connected with an electrochemical workstation.
8. An online nondestructive space-time resolution monitoring device for corrosion in pipes according to claim 1 wherein said clamp (8) is made of an insulating material.
9. An online nondestructive space-time resolution monitoring method for corrosion in a pipeline is characterized by comprising the following steps:
the method comprises the following steps: finishing the polishing and cleaning treatment of the outer wall of the pipeline (9) to be tested;
step two: bringing the electrochemical sensor as claimed in claim 1 into close contact with the outer wall of the pipe (9) with a clamp (8);
step three: connecting a three-electrode lead wire in the electrochemical sensor with an external electrochemical workstation, receiving a signal, and starting to perform experimental test;
step four: connecting a peripheral computing processing unit with an external electrochemical workstation, and recording, analyzing, processing and outputting data acquired by the electrochemical workstation;
step five: according to the required simulated field working condition, experimental corrosion medium, temperature and pressure conditions are designed, and the in-situ electrochemical test is started, so that potential distribution maps, current distribution maps and space charge layer thickness distribution maps of different areas at different time are obtained, and the time-space resolution monitoring of the corrosion in the pipeline (9) is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010806582.8A CN111965100A (en) | 2020-08-12 | 2020-08-12 | Online nondestructive time-space resolution monitoring method and device for corrosion in pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010806582.8A CN111965100A (en) | 2020-08-12 | 2020-08-12 | Online nondestructive time-space resolution monitoring method and device for corrosion in pipeline |
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| CN111965100A true CN111965100A (en) | 2020-11-20 |
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| CN202010806582.8A Pending CN111965100A (en) | 2020-08-12 | 2020-08-12 | Online nondestructive time-space resolution monitoring method and device for corrosion in pipeline |
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Effective date of registration: 20210210 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Applicant after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Applicant after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Applicant before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |
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