In-situ electrochemical corrosion monitoring device for gathering pipeline

Abstract

The application discloses a kind of gathering and transportation pipeline in-situ electrochemical corrosion monitoring devices, by being provided with through hole in the 0 ° position and both sides 45 ° angle position of pipeline nipple, 0 ° position through hole upper portion is provided with riser, working electrode system is arranged in riser, both sides 45 ° angle position is respectively provided with reference electrode universal ball head device and auxiliary electrode universal ball head device, reference electrode universal ball head device is provided with reference electrode system, auxiliary electrode universal ball head device is provided with auxiliary electrode system, by working condition simulation device on working electrode system simulates actual pipeline is corroded, by reference electrode system, the potential on working condition simulation device is measured, and by reference electrode wire, data is transmitted, compared with the standard potential measured on auxiliary electrode system, obtains the corrosion condition of pipeline simulated by working condition simulation device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of on-line corrosion monitoring technology of oilfield gathering pipelines, in particular to a gathering pipeline in-situ electrochemical corrosion monitoring device. BACKGROUND

[0002] After crude oil is lifted from the ground to the ground, it is mainly transported to the booster station, oil transfer station, oil gathering station or joint processing station through steel pipelines. Because the composition of crude oil is relatively complex, it may contain carbon dioxide, hydrogen sulfide, chloride ions, bacteria and other corrosive media, and the salinity is generally high, which can easily cause corrosion of steel pipelines. Especially in the middle and later stages of oilfield development, with the continuous rise of water content in crude oil and the extension of pipeline service time, pipeline leakage problems are increasingly prominent, which causes great safety hazards to oilfield production and becomes one of the problems that need to be solved and focused on. Therefore, it is necessary to carry out corrosion monitoring on gathering pipelines, especially on frequently leaking pipelines, to clarify the corrosion mechanism and carry out targeted corrosion protection technology research.

[0003] Currently, there are mainly two methods for studying the corrosion mechanism of gathering pipelines in oilfields. One is indoor simulation of working condition corrosion mechanism research, that is, by simulating the operating conditions of the pipeline on site, including temperature, pressure, material and other conditions, the pipeline corrosion mechanism is studied by simulating the pipeline or high-temperature high-pressure kettle; the advantage of this method is convenient and fast, without the need for field operation cost, the disadvantage is that it cannot completely simulate the actual working condition, especially the actual flow rate, temperature and pressure real-time change working condition, there is a certain deviation, only can carry out targeted comparative study from corrosion law, main influencing factors and other aspects. The other is field corrosion coupon (ring) corrosion mechanism research; the advantage of this method is that it can truly simulate the actual working conditions on site, and can clarify the main corrosion factors and characteristics, the disadvantage is that it cannot master the corrosion progress in real time, only can carry out corrosion mechanism research through one month, three months or half a year corrosion comparative study, and cannot carry out real-time analysis on the corrosion process. SUMMARY

[0004] The present application aims to provide a gathering pipeline in-situ electrochemical corrosion monitoring device to overcome the problem that the prior art can only carry out targeted comparative study from corrosion law, main influencing factors and other aspects, and cannot master the corrosion progress in real time, which can monitor the corrosion condition of different parts of the pipeline under the actual working condition of crude oil gathering, and clarify the corrosion mechanism and main corrosion factors through in-situ electrochemical monitoring.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The application discloses an in-situ electrochemical corrosion monitoring device for a gathering pipeline, which comprises a pipeline short section, a through hole is formed in the 0-degree position and the 45-degree position on both sides of the pipeline short section, a vertical pipe is arranged on the upper portion of the through hole in the 0-degree position, a working electrode system is arranged in the vertical pipe, the working electrode system comprises a sealing device and a working condition simulation device, the working condition simulation device is connected to the sealing device, a reference electrode universal ball head device and an auxiliary electrode universal ball head device are respectively arranged on the upper portion of the through hole in the 45-degree position on both sides, a reference electrode system is arranged in the reference electrode universal ball head device, the reference electrode system comprises a Luggin capillary salt bridge, a reference electrode and a reference electrode lead wire, one side of the reference electrode is connected to the reference electrode universal ball head device, and the other side of the reference electrode is connected to the Luggin capillary salt bridge, one side of the reference electrode lead wire is connected to the reference electrode, and the other side of the reference electrode lead wire is communicated to the outside of the pipeline short section, an auxiliary electrode system is arranged in the auxiliary electrode universal ball head device, the auxiliary electrode system comprises an auxiliary electrode, a ceramic insulation sleeve and an auxiliary electrode lead wire, one side of the auxiliary electrode lead wire is connected to the auxiliary electrode, and the other side of the auxiliary electrode lead wire is communicated to the outside of the pipeline short section, one side of the ceramic insulation sleeve is connected to the auxiliary electrode universal ball head device, and the other side of the ceramic insulation sleeve is connected to the auxiliary electrode.

[0007] Preferably, the sealing device comprises a sealing plug, a sealing gasket is arranged on the sealing plug, and the sealing plug and the sealing gasket are connected to the vertical pipe.

[0008] Preferably, the working condition simulation device comprises a lead screw, the top of the lead screw is connected to the sealing plug, an adjusting nut, an insulating pad and an insulating cylinder, a plurality of insulating short sections and a plurality of hanging rings are sequentially arranged on the lead screw in sequence, the plurality of insulating short sections and the plurality of hanging rings are alternately distributed, a limiting insulating plug is connected to the bottommost hanging ring, a limiting pin is connected to the limiting insulating plug, the plurality of hanging rings are all connected with working electrode lead wires, the working electrode lead wires pass through a through hole in the side wall of the vertical pipe and are connected to the outside of the pipeline, and a working electrode sealing plug is arranged on the through hole in the side wall of the vertical pipe.

[0009] Preferably, the material of the hanging ring is the same as that of the pipeline short section, and each hanging ring is connected with the working electrode lead wire in a spot welding mode.

[0010] Preferably, the reference electrode universal ball head device is designed as a universal ball head, the reference electrode can rotate, and the reference electrode lead wire can be elongated or shortened.

[0011] Preferably, the top of the reference electrode universal ball head device is provided with a reference electrode sealing plug, a limiting shoulder is arranged in the middle of the reference electrode universal ball head device, a supporting baffle is arranged on the limiting shoulder, a reference electrode sealing packing is arranged on the supporting baffle, the top of the reference electrode is connected with a reference electrode lead wire, the reference electrode lead wire passes through the supporting baffle and the reference electrode sealing plug and is communicated to the outside of the pipeline short section.

[0012] Preferably, the auxiliary electrode universal ball head device is provided with an auxiliary electrode sealing nipple at the top, an auxiliary electrode limiting shoulder in the middle, an auxiliary electrode supporting baffle on the limiting shoulder, an auxiliary electrode sealing packing on the supporting baffle, an auxiliary electrode lead wire in the ceramic insulation sleeve, and an auxiliary electrode connected at one end of the lead wire and communicated to the outside of the pipe nipple through the supporting baffle and the sealing nipple at the other end.

[0013] Preferably, the distance between the Luggin capillary salt bridge and the working condition simulation device is 4.5-5.5 mm.

[0014] Preferably, the reference electrode is an Ag / AgCl reference electrode or a saturated calomel reference electrode.

[0015] Preferably, the auxiliary electrode is a Pt electrode or a graphite electrode.

[0016] A gathering pipeline in-situ electrochemical corrosion monitoring device includes a pipe nipple, a through hole is formed in the 0° position and both sides of the 45° angle position of the pipe nipple, a vertical pipe is arranged on the upper part of the through hole in the 0° position, a working electrode system is arranged in the vertical pipe, the working electrode system includes a sealing device and a working condition simulation device, the working condition simulation device is connected to the sealing device, a reference electrode universal ball head device and an auxiliary electrode universal ball head device are arranged on the upper part of the through holes in both sides of the 45° angle position, a reference electrode system is arranged in the reference electrode universal ball head device, the reference electrode system includes a Luggin capillary salt bridge, a reference electrode, and a reference electrode lead wire, one side of the reference electrode is connected to the reference electrode universal ball head device, and the other side is connected to the Luggin capillary salt bridge, one side of the reference electrode lead wire is connected to the reference electrode, and the other side is communicated to the outside of the pipe nipple, an auxiliary electrode system is arranged in the auxiliary electrode universal ball head device, the auxiliary electrode system includes an auxiliary electrode, a ceramic insulation sleeve, and an auxiliary electrode lead wire, one side of the auxiliary electrode lead wire is connected to the auxiliary electrode, and the other side is communicated to the outside of the pipe nipple, one side of the ceramic insulation sleeve is connected to the auxiliary electrode universal ball head device, and the other side is connected to the auxiliary electrode.

[0017] Preferably, the sealing device includes a sealing nipple, a sealing gasket is arranged on the sealing nipple, and the sealing nipple and the sealing gasket are connected to the vertical pipe.

[0018] Preferably, the working condition simulation device comprises a lead screw, the top of the lead screw is connected with a sealing plug, the lead screw is sequentially provided with an adjusting nut, an insulating pad and an insulating cylinder, a plurality of insulating short sections and a plurality of hanging rings, the plurality of insulating short sections and the plurality of hanging rings are alternately distributed, the bottommost hanging ring is connected with a limiting insulating plug, the limiting insulating plug is connected with a limiting pin, the plurality of hanging rings are all connected with working electrode wires, the working electrode wires pass through a lateral wall through hole of the stand pipe and are connected to the outside of the pipeline, and the lateral wall through hole of the stand pipe is provided with a working electrode sealing plug.

[0019] Preferably, the material of the hanging ring is the same as that of the pipeline short section, and each hanging ring is connected with the working electrode wire in a spot welding manner.

[0020] Preferably, the reference universal ball head device is designed as a universal ball head, the reference electrode can rotate, and the reference electrode wire can be elongated or shortened.

[0021] Preferably, the top of the reference electrode universal ball head device is provided with a reference electrode sealing plug, the middle of the reference electrode universal ball head device is provided with a limiting shoulder, the limiting shoulder is provided with a supporting baffle, the supporting baffle is provided with a reference electrode sealing packing, the top of the reference electrode is connected with a reference electrode wire, and the reference electrode wire passes through the supporting baffle and the reference electrode sealing plug and is connected to the outside of the pipeline short section.

[0022] Preferably, the top of the auxiliary electrode universal ball head device is provided with an auxiliary electrode sealing plug, the middle of the auxiliary electrode universal ball head device is provided with an auxiliary electrode limiting shoulder, the auxiliary electrode limiting shoulder is provided with an auxiliary electrode supporting baffle, the auxiliary electrode supporting baffle is provided with an auxiliary electrode sealing packing, the auxiliary electrode wire is arranged in the ceramic insulating sleeve, one end of the auxiliary electrode wire is connected with an auxiliary electrode, and the other end of the auxiliary electrode wire passes through the auxiliary electrode supporting baffle and the auxiliary electrode sealing plug and is connected to the outside of the pipeline short section.

[0023] Preferably, the distance between the Luggin capillary salt bridge and the working condition simulation device is 4.5mm-5.5mm.

[0024] Preferably, the reference electrode is an Ag / AgCl reference electrode or a saturated calomel reference electrode.

[0025] Preferably, the auxiliary electrode is a Pt electrode or a graphite electrode.

[0026] Compared with the prior art, the present application has the following beneficial effects: the present application provides a gathering pipeline in-situ electrochemical corrosion monitoring device, a through hole is formed at the 0° position and both sides of the 45° angle position of the pipeline short section, a vertical pipe is arranged at the upper part of the 0° position through hole, a working electrode system is arranged in the vertical pipe, a reference electrode universal ball head device and an auxiliary electrode universal ball head device are arranged at the 45° angle position on both sides respectively, a reference electrode system is arranged in the reference electrode universal ball head device, an auxiliary electrode system is arranged in the auxiliary electrode universal ball head device, the working condition simulation device on the working electrode system is used to simulate the actual pipeline corrosion, the potential on the working condition simulation device is measured by the reference electrode system, and the data is transmitted out through the reference electrode lead wire, compared with the standard potential measured on the auxiliary electrode system, the corrosion condition of the pipeline simulated by the working condition simulation device is obtained.

[0027] Further, the reference universal ball head device is designed as a universal ball head, the reference electrode can rotate, the reference electrode lead wire can be elongated or shortened, and the corrosion conditions of different parts of the pipeline can be monitored.

[0028] Further, the distance between the Luggin capillary salt bridge and the working condition simulation device is 4.5mm-5.5mm, which greatly reduces the mutual interference of the working solution and the reference solution, and improves the data accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present application.

[0030] Figure 2 It is a schematic diagram of the overall installation structure of the steel gathering pipeline of the present application.

[0031] Figure 3 It is a schematic diagram of the working electrode system assembly structure of the present application.

[0032] Figure 4 It is a schematic diagram of the lead screw and adjusting nut structure of the present application.

[0033] Figure 5 It is a schematic diagram of the insulating gasket structure of the present application, Fig. a is a side view of the insulating gasket, and Fig. b is a front view of the insulating gasket.

[0034] Figure 6 It is a schematic diagram of the insulating cylinder assembly of the present application, Fig. a is a side view of the insulating cylinder, and Fig. b is a front view of the insulating cylinder.

[0035] Figure 7 It is a schematic diagram of the hanging ring assembly of the present application, Fig. a is a side view of the hanging ring, and Fig. b is a front view of the hanging ring.

[0036] Figure 8 It is a schematic diagram of the limiting insulating plug of the present application, Fig. a is a side view of the limiting insulating plug, and Fig. b is a front view of the insulating plug.

[0037] In the diagram, 1-sealing plug; 2-sealing gasket; 3-working electrode lead; 4-reference electrode lead; 5-reference electrode sealing plug; 6-reference electrode sealing packing; 7-support baffle; 8-limiting shoulder; 9-reference electrode; 10-reference electrode universal ball joint device; 11-Lugin capillary salt bridge; 12-insulating cylinder; 13-insulating short section; 14-hanging ring; 15-limiting insulating plug; 16-limiting pin; 17-lead screw; 18-working electrode sealing plug; 19-adjusting nut; 20-insulating gasket; 21-auxiliary electrode lead; 22-auxiliary electrode sealing plug; 23-auxiliary electrode sealing packing; 24-auxiliary electrode support baffle; 25-auxiliary electrode limit shoulder; 26-auxiliary electrode universal ball joint device; 27-ceramic insulating sleeve; 28-auxiliary electrode; 29-pipe short section; 30-transporting medium; 31-nut through hole; 32-flange. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0039] like Figures 1-8 As shown, this invention provides an in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines, mainly composed of several parts including a sealing plug 1, a sealing gasket 2, a working electrode wire 3, a reference electrode wire 4, a reference electrode sealing plug 5, a reference electrode sealing packing 6, a support baffle 7, a limiting shoulder 8, a reference electrode 9, a reference electrode universal ball joint device 10, a Lugin capillary salt bridge 11, an insulating cylinder 12, an insulating short section 13, a hanging ring 14, a limiting insulating plug 15, a limiting pin 16, a lead screw 17, a working electrode sealing plug 18, an adjusting nut 19, an insulating gasket 20, an auxiliary electrode wire 21, an auxiliary electrode sealing plug 22, an auxiliary electrode sealing packing 23, an auxiliary electrode support baffle 24, an auxiliary electrode limiting shoulder 25, an auxiliary electrode universal ball joint device 26, a ceramic insulating sleeve 27, an auxiliary electrode 28, a pipeline short section 29, a flange 32, and a nut through hole 31.

[0040] The features are as follows: the diameter and material of the pipeline section 29 are consistent with those of the gathering and transportation pipeline, and the length is not less than 0.5 meters, which can be adjusted according to site requirements; the pipeline section 29 has through holes at the 0 point position in the middle and at the 45° angle positions on both sides, and the upper part of the through holes is connected to the riser or universal ball joint device by welding respectively. The riser at the 0 point position is connected to the working electrode system, and the universal ball joint devices at the 45° angle positions on both sides are connected to the auxiliary electrode system and the reference electrode system respectively. They are connected to the external electrochemical workstation of the pipeline section 29 through wires to carry out in-situ electrochemical corrosion monitoring.

[0041] The working electrode system is placed in the 0-point vertical pipe, the upper part is connected with the vertical pipe through the sealing plug 1 and the sealing gasket 2, sealing is carried out, the sealing of the gathering pipeline is ensured, in-situ electrochemical measurement is carried out in the normal gathering process of the crude oil, and the corrosion mechanism under the actual working condition of the hanging ring 14 is mastered; the lower part of the sealing plug 1 is connected with the screw rod 17 through threads, and the length of the screw rod is controlled through the adjusting nut 19; the screw rod 17 is processed from stainless steel or carbon steel, after being connected with the sealing plug 1, the insulating gasket 20 is first sleeved, which is insulated from the upper adjusting nut 19, the insulating gasket 20 is processed from polytetrafluoroethylene or nylon; then the insulating cylinder 12, the insulating short section 13 and the hanging ring 14 are sleeved on the screw rod 17, the insulating short section 13 and the hanging ring 14 are sequentially and spacedly arranged, the outer diameter of the insulating cylinder 12 is smaller than the inner diameter of the insulating short section 13, the insulating cylinder 12 ensures that the hanging ring 14 is insulated from the screw rod 17, the insulating short section 13 separates each hanging ring 14, and the height of the hanging ring 14 in the pipeline section 29 is controlled through the insulating short sections 13 with different lengths, so that the hanging rings 14 are distributed in the upper part, the middle part and the lower part of the pipeline section 29; the hanging ring 14 in the lower part of the pipeline section 29 is connected with the limiting insulating plug 15, the limiting insulating plug 15 is provided with a through hole, the lower end of the screw rod 17 is also provided with a through hole, the two through holes are adjusted to be communicated, a limiting pin 16 is penetrated, one end of the limiting pin 16 is a big head ring structure, the big head ring is larger than the size of the through hole, the other end is designed as a fork type, after the fork type is opened to the two sides, the limiting pin is ensured not to slide or fall off, so that the upper insulating gasket 20, the insulating cylinder 12, the insulating short section 13, the hanging ring 14 and the limiting insulating plug 15 are connected tightly and do not slide or fall off; the insulating gasket 20, the insulating cylinder 12, the insulating short section 13 and the limiting insulating plug 15 are all processed from polytetrafluoroethylene or nylon, so that the screw rod 17, the hanging ring 14 and the limiting pin 16 are insulated, and galvanic corrosion does not occur.

[0042] The reference electrode system is placed in the reference universal ball head device 10 on the 45° angle side of the steel pipe, the lower part of the reference universal ball head device 10 is the Lugan capillary salt bridge 11, the top end of the Lugan capillary salt bridge 11 is opposite to the surface of the workpiece to be measured hanging ring 14, the distance is 4.5mm-5.5mm, in order to reduce the mutual interference of the working solution and the reference solution; the upper part of the Lugan capillary salt bridge 11 is connected with the reference electrode 8, the reference electrode 9 is Ag / AgCl reference electrode 9 or saturated calomel reference electrode 9, the upper part of the reference electrode 9 is connected with the reference electrode lead 4, the reference electrode lead 4 passes through the center hole of the support baffle 7 and the reference electrode sealing plug 5 and extends to the outside of the pipe short section 29; the middle part of the reference universal ball head device 10 is provided with a limiting shoulder 8, the support baffle 7 is placed on the limiting shoulder 8, the support baffle 7 is placed on the reference electrode sealing packing 6, and the top is dynamically sealed by the reference electrode sealing plug 5; the reference universal ball head device 10 is designed as a universal ball head, the reference electrode 9 can rotate within a certain angle, and the reference electrode lead 4 can realize dynamic sealing, so that the reference electrode lead 4 can be extended or shortened under the sealing condition, thereby realizing the measurement of the hanging rings at the upper part, the middle part and the lower part of the pipe short section 29.

[0043] The Lugan capillary salt bridge 11 is a glass product, which is blow-formed after heating the glass, and the shape is as shown in Figure 1 The other end of the vertical glass tube is thickened by heating to form a round mouth; after the glass tube cools down, electrolyte solution is poured into the glass tube, the formula of the electrolyte solution is agar: KCl: deionized water = 4:32:64; a certain proportion of deionized water is first put into a beaker in a heating mode, then KCl and agar in the formula proportion are added in turn, and stirred uniformly to make them completely dissolved; then pour into the Lugan capillary tube, and insert a saturated calomel electrode or an Ag / AgCl electrode, the electrode tip is fully immersed in the electrolyte solution, after the electrolyte solution cools down and solidifies, remove the excess electrolyte solution at the tip and the end, it can be used, when not in use, it can be soaked in saturated potassium chloride solution to prevent the deterioration of the composite electrode replenishing solution, and it is the Lugan capillary salt bridge 11.

[0044] The auxiliary electrode system is placed in the auxiliary electrode universal ball head device 26 on the other side of the 45° angle of the steel pipe, the lower part of the auxiliary electrode universal ball head device 26 is the auxiliary electrode 28, the auxiliary electrode 28 is a Pt electrode or a graphite electrode, the auxiliary electrode 28 is connected with the ceramic insulating sleeve 27, the auxiliary electrode lead 21 is inserted into the ceramic insulating sleeve 27, one end of which is connected with the auxiliary electrode 28, and the other end extends to the outside of the pipe section 29 through the center hole of the auxiliary electrode support baffle 24 and the auxiliary electrode sealing plug 22; the auxiliary electrode universal ball head device 26 is provided with an auxiliary electrode limiting shoulder 25, the auxiliary electrode support baffle 24 is arranged on the auxiliary electrode limiting shoulder 25, the auxiliary electrode support baffle 24 is arranged with the auxiliary electrode sealing packing 23 on the upper part, and the top is dynamically sealed by the auxiliary electrode sealing plug 22; the auxiliary universal ball head device 26 is designed as a universal ball head, the auxiliary electrode 28 can rotate within a certain angle, and the auxiliary electrode lead 21 and the ceramic insulating sleeve 27 can realize dynamic sealing, so that the pipe section 29 can be extended or shortened under the sealing condition, thereby realizing the measurement of the hanging rings at the upper part, the middle part and the lower part of the pipe section 29.

[0045] The hanging ring 14 is made of the same material as the pipe section 29, or is directly processed from the pipe section 29, and the upper part of each hanging ring 14 is connected with the working electrode lead 3 by spot welding, the working electrode lead 3 is an insulated lead, the working electrode leads 3 are insulated from each other, the working electrode lead 3 is inserted out through the small hole in the side wall of the vertical pipe at the 0 point position, the upper part of the hole is sealed by the sleeve, the sealing packing and the sealing plug 1, and the working electrode lead 3 is left outside the vertical pipe and is dynamically sealed by the sealing packing; each working electrode lead 3 is numbered to mark which hanging ring 14 is connected with the working electrode lead 3, so as to facilitate in-situ electrochemical corrosion monitoring.

[0046] The reference electrode system and the auxiliary electrode system are respectively arranged in the universal ball head device, can be selected within a certain angle, can be extended or contracted under the premise of ensuring dynamic sealing, and can measure the hanging rings on the upper part, the middle part or the lower part of the pipe section 29, carry out in-situ electrochemical corrosion monitoring of different parts of the inner wall of the pipe section 29, and clarify the corrosion mechanism of the pipe section 29 at different parts. The pipe section 29 is connected with the external gathering pipeline through the flange 32 and the nut through hole 32, realizes real-time measurement, and the inside of the pipe section 29 is filled with the conveying medium 30.

[0047] Working principle:

[0048] The through hole is arranged at the 0-degree position and the 45-degree angle positions on both sides of the pipe short section, the upper part of the through hole at the 0-degree position is provided with a vertical pipe, the vertical pipe is provided with a working electrode system, the 45-degree angle positions on both sides are respectively provided with a reference electrode universal ball head device and an auxiliary electrode universal ball head device, the reference electrode universal ball head device is provided with a reference electrode system, the auxiliary electrode universal ball head device is provided with an auxiliary electrode system, the working condition simulation device on the working electrode system simulates the actual pipeline corrosion, the reference electrode system measures the potential on the working condition simulation device, and the data is transmitted through the reference electrode lead wire, compared with the standard potential measured on the auxiliary electrode system, the corrosion condition of the pipeline simulated by the working condition simulation device is obtained.

[0049] The beneficial effects of the present application are:

[0050] 1. The in-situ electrochemical corrosion monitoring device can monitor the in-situ electrochemical corrosion of different parts of the gathering pipeline inner wall, and can determine the corrosion mechanism of different parts, so as to carry out targeted corrosion prevention and treatment, and solve the disadvantages of traditional corrosion coupon that cannot be monitored online and in real time, and the data is more real and reliable.

[0051] 2. The auxiliary electrode system and the reference electrode system are designed with dynamic sealing and universal ball head device, which can realize the movement of the auxiliary electrode and the reference electrode within a certain angle and displacement, so as to realize the in-situ electrochemical corrosion monitoring of the hanging ring of different parts of the gathering pipeline, such as the upper part, the middle part and the lower part.

[0052] 3. The Luggin capillary salt bridge is opposite to the surface of the hanging ring workpiece to be measured, which is convenient to use, can greatly reduce the mutual interference of the working solution and the reference solution, and improve the data accuracy; the dynamic sealing system composed of limiting shoulder, sealing packing and plug can ensure that the auxiliary electrode and the reference electrode can move up and down while the gathering system remains sealed, without affecting the normal gathering of the pipeline, so as to realize the in-situ electrochemical corrosion monitoring of different parts of the pipeline.

[0053] Although the embodiments of the present application are described above in combination with the drawings, the present application is not limited to the above specific embodiments and application fields, and the above specific embodiments are only illustrative and guiding, but not limiting. Those skilled in the art can make many forms under the guidance of the specification without departing from the scope protected by the claims of the present application, and these all belong to the protection of the present application.

Claims

1. An in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines, characterized in that, The system includes a pipe section (29), which has through holes at 0° and 45° angles on both sides. A riser is installed above the through hole at 0°. A working electrode system is installed inside the riser. The working electrode system includes a sealing device and a working condition simulation device. The working condition simulation device is connected to the sealing device. A reference electrode universal ball joint device (10) and an auxiliary electrode universal ball joint device (26) are respectively installed above the through holes at 45° angles on both sides. A reference electrode system is installed inside the reference electrode universal ball joint device (10). The reference electrode system includes a Luggin capillary salt bridge (11), a reference electrode (9), and a reference electrode wire (4). The reference electrode (9) is... One side is connected to the reference electrode universal ball joint device (10), and the other side is connected to the Lugin capillary salt bridge (11). One side of the reference electrode wire (4) is connected to the reference electrode (9), and the other side is connected to the outside of the pipe section (29). The auxiliary electrode universal ball joint device (26) is equipped with an auxiliary electrode system. The auxiliary electrode system includes an auxiliary electrode (28), a ceramic insulating sleeve (27), and an auxiliary electrode wire (21). One side of the auxiliary electrode wire (21) is connected to the auxiliary electrode (28), and the other side is connected to the outside of the pipe section (29). One side of the ceramic insulating sleeve (27) is connected to the auxiliary electrode universal ball joint device (26), and the other side is connected to the auxiliary electrode (28). The sealing device includes a sealing plug (1), a sealing gasket (2) is provided on the sealing plug (1), and both the sealing plug (1) and the sealing gasket (2) are connected to the riser. The working condition simulation device includes a lead screw (17), the top of which is connected to a sealing plug (1). The lead screw (17) is provided with an adjusting nut (19), an insulating gasket (20), an insulating cylinder (12), multiple insulating short sections (13), and multiple hanging rings (14) in sequence. The multiple insulating short sections (13) and multiple hanging rings (14) are alternately distributed. The bottommost hanging ring (14) is connected to a limiting insulating plug (15), and the limiting insulating plug (15) is connected to a limiting pin (16). Each of the multiple hanging rings (14) is connected to a working electrode wire (3). The working electrode wire (3) passes through the through hole in the side wall of the riser and connects to the outside of the pipe short section (29). The through hole in the side wall of the riser is provided with a working electrode sealing plug (18).

2. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The material of the hanging ring (14) is the same as that of the pipe section (29), and each hanging ring (14) is connected to the working electrode wire (3) by spot welding.

3. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The reference electrode universal ball joint device (10) is designed as a universal ball joint, the reference electrode (9) can rotate, and the reference electrode wire (4) can be extended or shortened.

4. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The reference electrode universal ball joint device (10) is provided with a reference electrode sealing plug (5) at the top, and a limiting shoulder (8) is provided in the middle of the reference electrode universal ball joint device (10). A supporting baffle (7) is provided on the limiting shoulder (8), and a reference electrode sealing packing (6) is provided on the supporting baffle (7). A reference electrode wire (4) is connected to the top of the reference electrode (9). The reference electrode wire (4) passes through the supporting baffle (7) and the reference electrode sealing plug (5) and connects to the outside of the pipe section (29).

5. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The auxiliary electrode universal ball joint device (26) is provided with an auxiliary electrode sealing plug (22) at the top, and an auxiliary electric limit stop (25) is provided in the middle of the auxiliary electrode universal ball joint device (26). An auxiliary electrode support baffle (24) is provided on the auxiliary electric limit stop (25), and an auxiliary electrode sealing packing (23) is provided on the auxiliary electrode support baffle (24). An auxiliary electrode wire (21) is passed through the ceramic insulating sleeve (27). One end of the auxiliary electrode wire (21) is connected to the auxiliary electrode (28), and the other end passes through the auxiliary electrode support baffle (24) and the auxiliary electrode sealing plug (22) to communicate with the outside of the pipe section (29).

6. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The distance between the Lujin capillary salt bridge (11) and the working condition simulation device is 4.5mm-5.5mm.

7. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The reference electrode (9) is an Ag / AgCl reference electrode or a saturated calomel reference electrode.

8. The in-situ electrochemical corrosion monitoring device for gathering and transportation pipelines according to claim 1, characterized in that, The auxiliary electrode (28) is a Pt electrode or a graphite electrode.

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