LU500383B1 - Multifunctional corrosion real-time monitoring device and method for interior of oil-water separation tank - Google Patents

Abstract

A multifunctional corrosion real-time monitoring device and method for the interior of an oil-water separation tank are provided. The device includes a floating platform and a remote monitoring chamber. The floating platform includes an air bag, a framework, and flat plates; the air bag is embedded in the framework; an upper end surface and a lower end surface of the framework are respectively provided with the flat plates; four test sample feet are mounted at four corners of the floating platform in a penetrating manner; four layers of test sample hang pieces are hung on each test sample foot; the flat plate at the lower part of the floating platform is provided with a pH value probe, a temperature probe, a corrosion rate probe, a Cl- concentration probe, a voltage probe, and a current density probe; the flat plate at the upper part of the floating platform is provided with a gas monitor, a wireless transmitter, and a storage battery pack; the remote monitoring room is equipped with a wireless receiver; and the wireless receiver is connected to a computer through a data wire. The present disclosure can reflect in real time changes and corrosion of a medium in the tank and a dissolution degree and a protection effect of a sacrificial anode block for cathode protection, so that premature failure of a tank body, and even the occurrence of a storage tank leakage accident can be effectively prevented; and moreover, the burden on a worker can also be greatly reduced.

Description

MULTIFUNCTIONAL CORROSION REAL-TIME MONITORING DEVICE ~~ LV500583 AND METHOD FOR INTERIOR OF OIL-WATER SEPARATION TANK

TECHNICAL FIELD

[01] The present disclosure relates to the field of monitoring devices in a storage tank, in particular, a multifunctional corrosion real-time monitoring device and method for the interior of an oil-water separation tank.

BACKGROUND ART

[02] After nearly decades of development, the Chinese major oil fields have now entered a high-moisture development stage, even an ultrahigh-moisture development stage, and the comprehensive moisture content of produced liquid is even greater than 90%. Since the produced water is high in degree of mineralization, has a large content of CI, and contains carbon dioxide, hydrogen sulfide, sediment and microorganisms such as sulfate reducing bacteria; furthermore, due to interactions such as higher water temperature, flow velocity, and flow rate change, the inner wall of the oil-water separation tank is severely corroded; and it has become one of the main factors restricting the safety production of oil fields. At the same time, most oil fields generally use a multi-layered mining and produced liquid mixed transporting process, while scaling ions (e.g., Ca?*, CO+-”, and SO4”) in the produced liquid on the different layers are greatly different in content, so that the sediments such as calcium carbonate and calcium sulfate are easy to generate during mixing. This makes an increase in operating cost of an oil field, causing huge economic loss, and even causing safety and environmental pollution accidents.

[03] In order to reduce the corrosion in a tank, the magnesium alloy sacrificial anode block is generally mounted at the bottom of the tank; meanwhile, the inner wall of the tank is coated with a coating layer to physically isolate an oil-water medium from a metal base body of the inner wall in the tank. However, due to its own quality problem and deposition or adsorption of sediments (slit, scale, microorganisms) on its surface, the sacrificial anode block dissolves fast, or dissolves non-uniformly, or even does not dissolve; or since the sacrificial anode block is not tightly connected to a tank body, or dirt is deposited on the surface of the sacrificial anode block, the protection effect on the tank is poor. Moreover, different quality and coating processes for coating layers result in different protection properties on the tank. In addition, fluid in the tank collects produced liquid of different layers and different block oil wells; components and acidities of a medium within different time are different, resulting in larger fluctuations in its corrosivity, which causes the coating layer to be blistered and event separated to lose the protection effect on the tank; partial separation can even form "large cathode - small anode" corrosion pattern which will accelerate local corrosion of the tank body.

[04] At present, a general monitoring method is used for regular discontinulation for opening tank for monitoring: firstly, checking whether the surface of the sacrificial anode block is dissolved uniformly; secondly, checking whether the coating layer on the surface in the tank body has blistering and peeling phenomena; and thirdly, in case of peeling, monitoring the wall thickness of the tank body. The disadvantages are: Firstly, 1 it is necessary to stop production, which affects the normal production of oil fields; LU500383 secondly, the tank needs to be cleaned till the inside of the tank is clean, and no residual oil, water, soil, and other debris are left, so that the workload is high; thirdly, the latency of monitoring cannot reflect thinning of the inner wall of the separation tank, the corrosive effect of the medium, the protection effect of the sacrificial anode block, and whether sacrificial anode block's size is critical. Under such service conditions, the inner wall of the tank body is still corroded severely, and the corrosion is not found and repaired in time, resulting in premature failure of the separation tank.

SUMMARY

[05] The purpose of the present disclosure is to solve the shortcomings of the existing technology and provide a multifunctional corrosion real-time monitoring device and method for the interior of an oil-water separation tank that are combined with the oil field production practice and are capable of reflecting fluctuations in the water quality of produced water of an oil field, the dissolution and protection effect of the sacrificial anode block for cathode protection, and the corrosion of the inner wall of a tank body, thereby effectively preventing premature failure of the tank body and even the occurrence of a storage tank leakage accident.

[06] In order to achieve the foregoing purposes, the present disclosure is implemented according to the following technical solutions:

[07] a multifunctional corrosion real-time monitoring device for the interior of an oil-water separation tank, including a floating platform capable of freely floating in the oil-water separation tank, and a remote monitoring room. The floating platform includes an air bag made of a corrosion-resistant material, a framework, and a flat plate. At least four groups of air bags are embedded in the framework; an upper end surface and a lower end surface of the framework are respectively provided with flat plates; four test sample feet are mounted at four corners of the floating platform in a penetrating manner; four layers of test sample hang pieces are hung on each test sample foot; three layers of test sample hang pieces are located below the flat plate at the lower part of the floating platform, and the other layer of test sample hang pieces is located above the flat plate at the upper part of the floating platform; a gap that is 3 mm or above is reserved between two adjacent layers of test sample hang pieces; and each layer of test sample hang pieces are isolated by polytetrafluoroethylene spacers to avoid contact corrosion or crevice corrosion between the test sample hang pieces. A plurality of mounting holes are preserved in the middle of the lower end surface of the flat plate at the lower part of the floating platform; a pH value probe, a temperature probe, a corrosion rate probe, a CI concentration probe, a voltage probe, and a current density probe are mounted in the plurality of mounting holes; the voltage probe is connected to a sacrificial anode block for cathode protection of the oil-water separation tank through a lead wire; and the current density probe is connected to a sacrificial anode block mounted at the bottom of the oil-water separation tank through a lead wire. The upper end surface of the flat plate at the upper part of the floating platform is fixedly provided with gas monitors used for monitoring concentrations of CO; and H:S that overflow from a medium in the oil-water separation tank, and a wireless transmitter and a storage battery pack; the pH 2 value probe, the temperature probe, the corrosion rate probe, the CI” concentration probe, LU500383 the voltage probe, the current density probe, and the gas monitor are connected to the wireless transmitter respectively through data wires; and the storage battery pack is used for providing uninterruptible power to all the probes or the instrument on the floating platform to guarantee the continuity of monitored data. A wireless receiver used for receiving a signal transmitted by the wireless transmitter is installed in the remote monitoring room; the wireless receiver converts a received electric signal into a digital signal; the wireless receiver is connected to a computer; and the computer is provided with parsing software for automatically reading the digital signal and converting the digital signal into a dynamically changing curve graph corresponding to computer network time.

[08] Further, the upper end surface of the flat plate at the upper part of the floating platform is provided with four handles; and the handles are symmetrically mounted on the inner sides of the test sample feet. As such, the floating platform can be steadily placed into and taken out of the oil-water separation tank without affecting the installed test sample hang pieces.

[09] More further, the flat plates at the upper and lower parts of the floating platform both have rounded square sections, and a length of a diagonal of each square is less than a diameter of an opening of the oil-water separation tank. As such, damage from the floating platform in a floating process to a coating layer on the inner wall of the oil-water separation tank can be effectively reduced; and the length of the diagonal of each square is less than the diameter of the opening of the oil-water separation tank, so that the floating platform can be freely placed in and taken out from the opening of the oil-water separation tank successfully.

[10] Much further, each test sample hang piece is a bare steel test sample that is the same as a material of a tank body of the oil-water separation tank and/or a coating layer test sample that is the same as a formula and a coating process of the coating layer in the oil-water separation tank.

[11] Much further, a top end and a tail end of each test sample foot are each provided with a soft protecting cap to prevent the top end and the tail end of the test sample foot from scratching the inner wall of the oil-water separation tank when the floating platform floats.

[12] In addition, the present disclosure further provides a multifunctional corrosion real-time monitoring method for the interior of an oil-water separation tank, including the following specific steps:

[13] Step I, after the multifunctional corrosion real-time monitoring device for the interior of an oil-water separation tank is assembled, steadily placing the multifunctional corrosion real-time monitoring device for an interior of an oil-water separation tank to the oil-water separation tank through the handles, wherein the pH probe is used for monitoring a pH value of the medium in the oil-water separation tank; the temperature probe is used for monitoring a temperature of the medium in the oil-water separation tank; the Cl" concentration probe is used for monitoring a CI content of the medium in the oil-water separation tank; the corrosion rate probe is used for monitoring the corrosivity of the medium in the oil-water separation tank; the 3 voltage probe is used for monitoring a protection potential of the sacrificial anode block LU500383 in the oil-water separation tank; the current density probe is used for monitoring an output current of the sacrificial anode block; the gas monitors are used for monitoring concentrations of CO; and H:S that overflow from the medium in the oil-water separation tank; the four layers of test sample hang pieces are respectively as follows from bottom to top: the bottom layer of test sample hang pieces 1s used for monitoring the corrosivity of an aqueous phase region at the bottom of the oil-water separation tank; the middle lower layer of test sample hang pieces is used for monitoring the corrosivity of an oil-water interface; the middle upper layer of test sample hang pieces is used for monitoring the corrosivity of an oil phase region below a liquid level; the upper layer of test sample hang pieces is used for monitoring the corrosivity of a gas phase region above the liquid level;

[14] Step II, after respectively connecting all the monitoring probes and the gas monitors in the step I to the wireless transmitter through the data wires, converting monitored information into electric signals and wirelessly transmitting the electric signals to the wireless receiver through the wireless transmitter, wherein the wireless receiver respectively converts the received different electric signals into different digital signals and transmits the digital signals to the computer through a data wire; the parsing software on the computer automatically reads the digital signals, converts the digital signals into a dynamic change curve graph corresponding to computer network time, and stores the monitored information to a hard disk for later query; using a display of the computer to display a parsed real-time monitoring result or display fluctuations in various indexes that are queried and monitored in the early stage, and determining, according to a real-time monitoring result of the computer or the displayed fluctuations in the various queried indexes monitored in the early stage, the dissolution and the protection effect of the sacrificial anode block, whether the bare steel test samples are to be severely corroded or whether the coating layer test samples change obviously.

[15] Compared with the existing technology, the present disclosure can perform relatively comprehensive real-time dynamic monitoring on multiple indexes in the tank. All the monitoring probes and the gas monitor of the present disclosure are connected to the wireless transmitter through the data wires, and then convert the monitored information into the electric signals and wirelessly transmit the electric signals to the wireless receiver through the wireless transmitter, the wireless receiver respectively converts the received different electric signals into different digital signals and transmits the digital signals to the computer through a data wire; the parsing software on the computer automatically reads the digital signals, converts the digital signals into the dynamic change curve graph corresponding to the computer network time, and stores the monitored information to the hard disk for later query; the display of the computer is used to display the parsed real-time monitoring result or display the fluctuations in the various indexes that are queried and monitored in the early stage; therefore, production does not need to be halted, and internal sampling for monitoring is not needed; the various desired monitoring parameters can be reflected in real-time to effectively prevent premature failure of the tank body and even the occurrence of a storage tank leakage accident; and furthermore, the burden on a worker can be greatly reduced.

4

BRIEF DESCRIPTION OF THE DRAWINGS

[16] FIG. 1 is a schematic diagram of a front structure of a floating platform of the present disclosure.

[17] FIG. 2 is a schematic diagram of a back structure of a floating platform of the present disclosure.

[18] FIG. 3 is a schematic structural diagram of a test sample foot of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[19] The present disclosure is further described below in combination with specific embodiments. Schematic embodiments and illustrations of this disclosure are used to explain the present disclosure, but are not intended to limit the present disclosure.

[20] As shown in FIG. 1, FIG. 2, and FIG. 3, a multifunctional corrosion real-time monitoring device for the interior of an oil-water separation tank includes a floating platform 1 capable of freely floating in the oil-water separation tank, and a remote monitoring room. The floating platform 1 includes an air bag made of a corrosion-resistant material (such as polytetrafluoroethylene), a framework, an upper flat plate 101 fixed on an upper end surface of the framework, and a lower flat plate 102 fixed on a lower end surface. At least four groups of air bags are embedded in the framework mainly to ensure that the whole floating platform 1 can balance on a liquid level in the oil-water separation tank; four test sample feet 5 are mounted at four corners of the floating platform 1 in a penetrating manner; four layers of test sample hang pieces are hung on each test sample foot 5, including: an upper layer of test sample hang pieces 51, a middle upper layer of test sample hang pieces 52, a middle lower layer of test sample hang pieces 53, and a bottom layer of test sample hang pieces 54, where the middle upper layer of test sample hang pieces 52, the middle lower layer of test sample hang pieces 53, and the bottom layer of test sample hang pieces 54 are located below the lower flat plate 102 of the floating platform 1, and the upper layer of test sample hang pieces 51 is located above the upper flat plate 101 of the floating platform 1; a gap that is 3 mm or above is reserved between two adjacent layers of test sample hang pieces; and each layer of test sample hang pieces are isolated by polytetrafluoroethylene spacers. A plurality of mounting holes 7 are preserved in the middle of the lower end surface of the lower flat plate 102 of the floating platform 1; a pH value probe, a temperature probe, a corrosion rate probe, a CI" concentration probe, a voltage probe, and a current density probe are mounted in the plurality of mounting holes 7; the voltage probe is connected to a sacrificial anode block mounted at the bottom of the oil-water separation tank through a lead wire; and the current density probe is connected to a sacrificial anode block for cathode protection in the oil-water separation tank through a lead wire. In practice, one end of the lead wire is connected to the sacrificial anode block in the oil-water separation tank, and the other end floats at the liquid level through buoys of different shapes for correct connection with different probes at the next time. The upper end surface of the upper flat plate 101 of the floating platform 1 is fixedly provided with a CO; monitor 2 used for monitoring a concentration of CO» that overflows from a medium in the oil-water separation tank and an H:S monitor 8 used LU500383 for monitoring a concentration of HS, and a wireless transmitter 3 and a storage battery pack 4; the pH value probe, the temperature probe, the corrosion rate probe, the Cl concentration probe, the voltage probe, the current density probe, and the gas monitor 2 are connected to the wireless transmitter 3 respectively through data wires; and the storage battery pack 4 is used for providing uninterruptible power to all the probes or the instrument on the floating platform. A wireless receiver used for receiving a signal transmitted by the wireless transmitter 3 is installed in the remote monitoring room; the wireless receiver converts a received electric signal into a digital signal; the wireless receiver is connected to a computer; and the computer is provided with parsing software for automatically reading the digital signal and converting the digital signal into a dynamically changing curve graph corresponding to computer network time.

[21] As an improvement of the above embodiment, the upper end surface of the upper flat plate 101 of the floating platform 1 is provided with four handles 6; and the handles are symmetrically mounted on the inner sides of the test sample feet 5. As such, the floating platform 1 can be steadily placed into and taken out of the oil-water separation tank without affecting the installed test sample hang pieces.

[22] As an improvement of the above embodiment, the upper flat plate 101 and the lower flat plate 102 of the floating platform 1 both have rounded square sections, and a length of a diagonal of each square is less than a diameter of an opening of the oil-water separation tank. As such, damage from the floating platform 1 in a floating process to a coating layer on the inner wall of the oil-water separation tank can be effectively reduced; and the length of the diagonal of each square is less than the diameter of the opening of the oil-water separation tank, so that the floating platform 1 can be freely placed in and taken out from the opening of the oil-water separation tank successfully.

[23] As an improvement of the above embodiment, each test sample hang piece is a bare steel test sample that is the same as the material of a tank body of the oil-water separation tank and/or a coating layer test sample that is the same as a formula and a coating process of the coating layer in the oil-water separation tank. Since the bare steel test samples are the same as the material of the tank body, the bare steel test samples are used for monitoring and reflecting the corrosivity of the medium and corrosion damage forms of the test samples caused by the medium. Since the coating layer test samples are the same as the formula and the coating process of the coating layer in the tank, the coating layer test samples are used for monitoring and reflecting the corrosivity of the coating layer in the medium.

[24] As an improvement of the above embodiment, a top end and a tail end of each test sample foot 5 are each provided with a soft protecting cap 55 to prevent the top end and the tail end of the test sample foot 5 from scratching the inner wall of the oil-water separation tank when the floating platform 1 floats.

[25] In addition, the present disclosure further provides a multifunctional corrosion real-time monitoring method for the interior of an oil-water separation tank, including the following specific steps:

[26] Step I, after the multifunctional corrosion real-time monitoring device for an interior of an oil-water separation tank is assembled, the multifunctional corrosion 6 real-time monitoring device for an interior of an oil-water separation tank is steadily LU500383 placed to the oil-water separation tank through the handles, wherein the pH probe is used for monitoring a pH value of the medium in the oil-water separation tank; the temperature probe is used for monitoring a temperature of the medium in the oil-water separation tank; the CI probe is used for monitoring a CI” content of the medium in the oil-water separation tank; the corrosion rate probe is used for monitoring the corrosivity of the medium in the oil-water separation tank; the voltage probe is used for monitoring a protection potential of the sacrificial anode block in the oil-water separation tank; the current density probe is used for monitoring an output current of the sacrificial anode block; the gas monitors are used for monitoring concentrations of CO; and HS that overflow from the medium in the oil-water separation tank; the four layers of test sample hang pieces are respectively as follows from bottom to top: the bottom layer of test sample hang pieces is used for monitoring the corrosivity of an aqueous phase region at the bottom of the oil-water separation tank; the middle lower layer of test sample hang pieces is used for monitoring the corrosivity of an oil-water interface; the middle upper layer of test sample hang pieces is used for monitoring the corrosivity of an oil phase region below a liquid level; the upper layer of test sample hang pieces is used for monitoring the corrosivity of a gas phase region above the liquid level;

[27] Step II, after all the monitoring probes and the gas monitors in the step I are respectively connected to the wireless transmitter through the data wires, monitored information is converted into electric signals and wirelessly transmitted to the wireless receiver through the wireless transmitter, wherein the wireless receiver respectively converts the received different electric signals into different digital signals and transmits the digital signals to the computer through a data wire; the parsing software on the computer automatically reads the digital signals, converts the digital signals into a dynamic change curve graph corresponding to computer network time, and stores the monitored information to a hard disk for later query; a display of the computer is used to display a parsed real-time monitoring result or display fluctuations in various indexes that are queried and monitored in the early stage; and the dissolution and the protection effect of the sacrificial anode block, whether the bare steel test samples are to be severely corroded or whether the coating layer test samples change obviously are determined according to a real-time monitoring result of the computer or the displayed fluctuations in the various queried indexes monitored in the early stage.

[28] In addition, the quantity of the floating platform can be determined according to the size of an actual tank body, and each floating platform has a maximum load of 15 kg. The floating platform can also determine a take-out time according to an actual monitoring solution; and the test samples are placed again to the tank after the corrosivity of the test sample is checked or after the test samples are replaced with the new test samples.

[29] Specific example 1: by means of the pH probe used for monitoring the pH value of the medium in the oil-water separation tank, the wireless transmitter converts the monitoring result into an electric signal and transmits the electric signal; the wireless receiver automatically converts the signals after receiving continuously transmitted signals, and transmits the signals to the computer through the data wire for storage; 7 relevant software is opened on the computer; a tab of "Acidity" is clicked, or a historical LU500383 record is queried, or a dynamic change curve graph of the pH value of the medium in the oil-water separation tank at a certain temperature is directly displayed on a computer screen. If the pH value displayed on the screen is relatively low, it is indicated that the medium in the oil-water separation tank is higher in corrosivity, and the monitored bare steel test sample is corroded faster, or the coating layer test sample may have an obvious change, so that the monitoring period needs to be shortened; and if the pH value is extremely low, the dissolution of the sacrificial anode block, the condition of the coating layer, and the wall thickness of the tank body need to be monitored after the transmission is stopped and the tank is cleaned, so as to perform related safety estimation.

[30] Specific example 2: if Cl” concentration data displayed under a tab of "CI concentration" of the relevant software of the computer fluctuates greatly, it is indicated that necessary measures need to be taken according to changes of liquid from various gathering pipelines monitored through the CI" probe, so as to avoid shortening of the service life of the tank body due to severe corrosion to the tank body of the oil-water separation tank because of the inadequate pretreatment of produced liquid in some wells, or to avoid severe scaling of sediment components on a surface of the sacrificial anode block due to the high scaling property of the produced liquid, thus affecting the outputting of protective current of the sacrificial anode block.

[31] Specific example 3: if a voltage/an output current of the sacrificial anode block at the bottom of the oil-water separation tank is instable or relatively high/relatively low, injection should be stopped immediately in the case of determining that other parameters do not fluctuate greatly, and personnel gets into the tank for checking, or the sacrificial anode block is replaced in time to ensure the protection effect of the sacrificial anode block on the tank body of the oil-water separation tank.

[32] The technical solutions of the present disclosure are not limited to the above specific embodiments, and technical deformations made according to the technical solutions of the present disclosure shall all fall within the protection scope of the present disclosure.

8

Claims (6)

WHAT IS CLAIMED IS: LUS00383

1. A multifunctional corrosion real-time monitoring device for the interior of an oil-water separation tank, comprising a floating platform capable of freely floating in the oil-water separation tank, and a remote monitoring room, wherein the floating platform comprises an air bag made of a corrosion-resistant material, a framework, and a flat plate; at least four groups of air bags are embedded in the framework; an upper end surface and a lower end surface of the framework are respectively provided with flat plates; four test sample feet are mounted at four corners of the floating platform in a penetrating manner; four layers of test sample hang pieces are hung on each test sample foot; three layers of test sample hang pieces are located below the flat plate at the lower part of the floating platform, and the other layer of test sample hang pieces is located above the flat plate at the upper part of the floating platform; a gap that is 3 mm or above is reserved between two adjacent layers of test sample hang pieces; each layer of test sample hang pieces are isolated by polytetrafluoroethylene spacers to avoid contact corrosion or crevice corrosion between the test sample hang pieces; a plurality of mounting holes are preserved in the middle of the lower end surface of the flat plate at the lower part of the floating platform; a pH value probe, a temperature probe, a corrosion rate probe, a Cl’ concentration probe, a voltage probe, and a current density probe are mounted in the plurality of mounting holes; the voltage probe is connected to a sacrificial anode block for cathode protection of the oil-water separation tank through a lead wire; the current density probe is connected to a sacrificial anode block mounted at the bottom of the oil-water separation tank through a lead wire; the upper end surface of the flat plate at the upper part of the floating platform is fixedly provided with gas monitors used for monitoring concentrations of CO» and H,S that overflow from the medium in the oil-water separation tank, and a wireless transmitter and a storage battery pack; the pH value probe, the temperature probe, the corrosion rate probe, the CI concentration probe, the voltage probe, the current density probe, and the gas monitor are connected to the wireless transmitter respectively through data wires; the storage battery pack is used for providing uninterruptible power to all the probes or the instrument on the floating platform to guarantee the continuity of monitored data; a wireless receiver used for receiving a signal transmitted by the wireless transmitter is installed in the remote monitoring room; the wireless receiver converts a received electric signal into a digital signal; the wireless receiver is connected to a computer; and the computer is provided with parsing software for automatically reading the digital signal and converting the digital signal into a dynamically changing curve graph corresponding to computer network time.

2. The multifunctional corrosion real-time monitoring device for the interior of the oil-water separation tank according to claim 1, wherein the upper end surface of the flat plate at the upper part of the floating platform is provided with four handles; and the handles are symmetrically mounted on the inner sides of the test sample feet.

3. The multifunctional corrosion real-time monitoring device for the interior of the oil-water separation tank according to claim 1, wherein the flat plates at the upper and lower parts of the floating platform both have rounded square sections, and a length of a 1 diagonal of each square is less than a diameter of an opening of the oil-water separation LU500383 tank.

4. The multifunctional corrosion real-time monitoring device for the interior of the oil-water separation tank according to claim 1, wherein each test sample hang piece is a bare steel test sample that is the same as a material of a tank body of the oil-water separation tank and/or a coating layer test sample that is the same as a formula and a coating process of the coating layer in the oil-water separation tank.

5. The multifunctional corrosion real-time monitoring device for the interior of the oil-water separation tank according to claim 1, wherein a top end and a tail end of each test sample foot are each provided with a soft protecting cap.

6. A multifunctional corrosion real-time monitoring method for the interior of an oil-water separation tank, using the multifunctional corrosion real-time monitoring device for an interior of an oil-water separation tank according to any one of claims 1 to to perform monitoring, wherein the method comprises the following specific steps: Step I, after the multifunctional corrosion real-time monitoring device for an interior of an oil-water separation tank is assembled, steadily placing the multifunctional corrosion real-time monitoring device for the interior of an oil-water separation tank to the oil-water separation tank through the handles, wherein the pH probe is used for monitoring a pH value of the medium in the oil-water separation tank; the temperature probe is used for monitoring a temperature of the medium in the oil-water separation tank; the Cl" probe is used for monitoring a CI content of the medium in the oil-water separation tank; the corrosion rate probe is used for monitoring the corrosivity of the medium in the oil-water separation tank; the voltage probe is used for monitoring a protection potential of the sacrificial anode block in the oil-water separation tank; the current density probe is used for monitoring an output current of the sacrificial anode block; the gas monitors are used for monitoring concentrations of CO» and HS that overflow from the medium in the oil-water separation tank; the four layers of test sample hang pieces are respectively as follows from bottom to top: the bottom layer of test sample hang pieces is used for monitoring the corrosivity of an aqueous phase region at the bottom of the oil-water separation tank; the middle lower layer of test sample hang pieces is used for monitoring the corrosivity of an oil-water interface; the middle upper layer of test sample hang pieces is used for monitoring the corrosivity of an oil phase region below a liquid level; the upper layer of test sample hang pieces is used for monitoring the corrosivity of a gas phase region above the liquid level; Step II, after respectively connecting all the monitoring probes and the gas monitors in the step I to the wireless transmitter through the data wires, converting monitored information into electric signals and wirelessly transmitting the electric signals to the wireless receiver through the wireless transmitter, wherein the wireless receiver respectively converts the received different electric signals into different digital signals and transmits the digital signals to the computer through a data wire; the parsing software on the computer automatically reads the digital signals, converts the digital signals into a dynamic change curve graph corresponding to computer network time, and stores the monitored information to a hard disk for later query; using a display of the computer to display a parsed real-time monitoring result or display fluctuations in 2 various indexes that are queried and monitored in the early stage, and determining, LU500383 according to a real-time monitoring result of the computer or the displayed fluctuations in the various queried indexes monitored in the early stage, the dissolution and the protection effect of the sacrificial anode block, whether the bare steel test samples are to be severely corroded or whether the coating layer test samples change obviously. 3