CN115679332A - Regional cathodic protection method and system - Google Patents
Regional cathodic protection method and system Download PDFInfo
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- CN115679332A CN115679332A CN202110866731.4A CN202110866731A CN115679332A CN 115679332 A CN115679332 A CN 115679332A CN 202110866731 A CN202110866731 A CN 202110866731A CN 115679332 A CN115679332 A CN 115679332A
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- 238000004210 cathodic protection Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 15
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- 239000012530 fluid Substances 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
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- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The application discloses a regional cathodic protection method and a regional cathodic protection system, and belongs to the technical field of oil and gas pipelines. The embodiment of the application provides a regional cathodic protection system, a voltage balancing device is arranged, the device can balance the voltage between a voltage equalizing point and a feed point according to the voltage difference between the voltage equalizing point and the feed point, the dynamic adjustment of the voltage in a protection area where a plurality of buried pipelines to be protected are located is realized, the expected protection effect cannot be achieved in the area, the serious problem of corrosion of the buried pipelines in the area is caused, and the regional cathodic protection effect is improved.
Description
Technical Field
The application relates to the technical field of oil and gas pipelines. And more particularly to a regional cathodic protection method and system.
Background
Buried pipelines are buried in soil for a long time, and as time goes on, the buried pipelines are corroded due to the influence of soil conditions and other factors, so that anti-corrosion measures need to be taken for the buried pipelines. Regional cathodic protection systems are becoming more and more widely used because they can effectively slow down the corrosion of buried pipelines.
In the regional cathodic protection system in the related art, anodes are buried near a plurality of buried pipelines to be protected, the anodes are connected to the positive pole of an external power supply, the plurality of buried pipelines to be protected are connected to the negative pole of the external power supply, and then the system is electrified. After the electrification, the current provided by the external power supply sequentially passes through the anode, the ground and the protected multiple buried pipelines from the anode and flows back to the cathode, and because the protected multiple buried pipelines are connected, the current can be dispersed to the multiple buried pipelines when passing through the protected multiple buried pipelines, so that the multiple buried pipelines are protected.
However, due to the difference in the surface corrosion protection grade of each buried pipeline, the dense staggered shielding of the buried pipelines and the difference in the resistivity of the ground soil, the system in the related art has the phenomenon of different voltage in the protection area, and the buried pipelines in some areas cannot achieve the expected protection effect, so that the buried pipelines in the area are corroded seriously, and the regional cathode protection effect is poor.
Disclosure of Invention
The embodiment of the application provides a regional cathodic protection method and a regional cathodic protection system, which can improve the regional cathodic protection effect. The specific technical scheme is as follows:
in a first aspect, embodiments of the present application provide a regional cathodic protection system, the system including: the device comprises an external power supply, an anode and a voltage balancing device;
the anode of the external power supply is electrically connected with the anode, and the cathode of the external power supply is electrically connected with the protected buried pipeline;
the negative electrode of the external power supply is also electrically connected with the first end of the voltage balancing device, and the second end of the voltage balancing device is used for being electrically connected with the protected buried pipeline;
the voltage balancing device and the electrical connection position of the protected buried pipeline form a voltage equalizing point, and the voltage balancing device and the electrical connection position of the negative electrode form a feed point;
the voltage balancing device is used for balancing the voltage between the voltage equalizing point and the feeding point according to the voltage difference between the first voltage at the voltage equalizing point and the second voltage at the feeding point.
In one possible implementation, the voltage balancing apparatus includes: a feed device and a directional drainage device;
a first end of the feeding device is electrically connected with the negative pole, a second end of the feeding device is electrically connected with a first end of the directional drainage device, and a second end of the directional drainage device is used for being electrically connected with the protected buried pipeline;
the feeding point is formed at the position where the feeding device is electrically connected with the negative pole, and the voltage equalizing point is formed at the position where the second end of the directional drainage device is electrically connected with the protected buried pipeline;
the directional drainage device is used for balancing the voltage between the voltage equalizing point and the feeding point according to the voltage difference.
In another possible implementation manner, the directional drainage device is configured to connect the voltage equalizing point to the feeding point when the voltage difference is greater than a preset voltage difference, and a current at the voltage equalizing point flows to the feeding point or a current at the feeding point flows to the voltage equalizing point;
the directional drainage device is further configured to disconnect the electrical connection between the voltage equalizing point and the feeding point when the voltage difference is not greater than the preset voltage difference.
In another possible implementation manner, the feeding device is composed of a plurality of feeding electrodes which are connected in series or in parallel;
the chemical activity of the material of the feed electrode is superior to that of the material of the protected buried pipeline.
In another possible implementation manner, the feeder device is buried in an edge section of a protection area where the protected buried pipeline is located, and the buried depth is not less than a first preset depth.
In another possible implementation, the directional drainage device is a bidirectional drainage device.
In another possible implementation manner, the burying depth of the anodes is not less than a second preset depth, and the number of the anodes is multiple.
In a second aspect, the present embodiments provide a regional cathodic protection method applied to the system of any one of the first aspects, the method including:
under the condition of electrifying, detecting a first voltage at the voltage equalizing point and a second voltage at the feeding point on the basis of current provided by the external power supply;
determining an absolute value of a voltage difference between the first voltage and the second voltage;
balancing the voltage between the voltage-equalizing point and the feeding point according to the absolute value of the voltage difference.
In one possible implementation, the balancing the voltage between the voltage equalizing point and the feeding point according to the absolute value of the voltage difference includes:
communicating the voltage equalizing point with the feeding point under the condition that the absolute value of the voltage difference is larger than the preset voltage difference, so that the current at the voltage equalizing point flows to the feeding point or the current at the feeding point flows to the voltage equalizing point;
and under the condition that the absolute value of the voltage difference is not larger than the preset voltage difference, the voltage-sharing point and the feeding point are disconnected.
In another possible implementation manner, the current provided by the external power supply flows from the positive electrode, through the anode, the stratum where the protected buried pipeline is located and the protected buried pipeline and flows back to the negative electrode; and/or the presence of a gas in the atmosphere,
the current provided by the external power supply flows from the anode, the stratum and the feed device to the cathode; and/or the presence of a gas in the atmosphere,
the current provided by the external power supply flows from the anode, through the anode, the stratum, the protected buried pipeline, the directional drainage device and the feed device and flows back to the cathode; and/or the presence of a gas in the gas,
and the current provided by the external power supply flows from the anode, through the ground layer, the feeding device, the directional drainage device and the protected buried pipeline and flows back to the cathode.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
the embodiment of the application provides a regional cathodic protection system, which is provided with a voltage balancing device, wherein the device can balance the voltage between a voltage equalizing point and a feed point according to the voltage difference between the voltage equalizing point and the feed point, so that the dynamic adjustment of the voltage in a protection area where a plurality of buried pipelines to be protected are positioned can be realized, the expected protection effect can not be achieved in the area, the serious corrosion problem of the buried pipelines in the area can be caused, and the regional cathodic protection effect is improved.
Drawings
Fig. 1 is a schematic diagram of a regional cathodic protection system provided in an embodiment of the present application;
FIG. 2 is a schematic view of another regional cathodic protection system provided in an embodiment of the present application;
fig. 3 is a flowchart of a regional cathodic protection method provided in an embodiment of the present application.
The reference numerals denote:
1-external power supply, 2-anode, 3-voltage balancing device, 31-feeding device and 32-directional drainage device.
Detailed Description
In order to make the technical solutions and advantages of the present application more clear, the following describes the embodiments of the present application in further detail.
An embodiment of the present application provides a regional cathodic protection system, see fig. 1, comprising: an external power supply 1, an anode 2 and a voltage balancing device 3;
the anode of the external power supply 1 is electrically connected with the anode 2, the cathode of the external power supply 1 is used for being electrically connected with a buried pipeline to be protected, and the buried pipeline to be protected comprises a plurality of buried pipelines;
the negative electrode of the external power supply 1 is also electrically connected with the first end of the voltage balancing device 3, and the second end of the voltage balancing device 3 is used for being electrically connected with a protected buried pipeline;
the voltage balance and the electric connection position of the protected buried pipeline form a voltage equalizing point, and the voltage balance device 3 and the electric connection position of the negative pole form a feed point;
and the voltage balancing device 3 is used for balancing the voltage between the voltage equalizing point and the feeding point according to the voltage difference between the first voltage at the voltage equalizing point and the second voltage at the feeding point.
The embodiment of the application provides a regional cathodic protection system, a voltage balancing device 3 is arranged, the device can balance the voltage between a voltage equalizing point and a feed point according to the voltage difference between the voltage equalizing point and the feed point, the dynamic adjustment of the voltage in a protection area where a plurality of buried pipelines to be protected are located is realized, the expected protection effect cannot be achieved in the area, the serious problem of corrosion of the buried pipelines in the area is caused, and the regional cathodic protection effect is improved.
Introduction of buried pipelines: in one possible implementation, the number of buried pipelines is multiple, electrical connections exist among the multiple buried pipelines, and when current exists on one buried pipeline, the current can flow to other buried pipelines based on the electrical connections, so that cathodic protection is performed on the multiple buried pipelines.
In this implementation, this many buried pipeline can be applied to gathering and transportation system under the well cluster field mode of construction, and the interval between oil well and the oil well is less under the well cluster field mode of construction, and the oil well is more in quantity, and these many buried pipeline are oil gas gathering and transportation pipeline under this mode. Therefore, the system provided by the embodiment of the application is suitable for the cathodic protection of the oil and gas gathering and transportation pipeline in a well cluster construction mode,
and, still there is the buried pipeline of being connected with pit shaft sleeve pipe electricity in the many buried pipeline under the well cluster field construction mode, when having the electric current on one of them buried pipeline, can flow to the pit shaft sleeve pipe based on this kind of electricity is connected, consequently, when carrying out cathodic protection to many buried pipelines through the system that this application provided, can also carry out synchronous protection to the pit shaft sleeve pipe to effectively reduce the defeated corrosion control cost of oil gas collection, improve the cathodic protection effect. The wellbore casing may be one or more groups, which is not limited in this respect.
In addition, the outer wall of each buried pipeline is also provided with an anticorrosive coating, corrosion of the buried pipeline can be further slowed down through the anticorrosive coating, the service life of the buried pipeline is prolonged, and production cost is reduced.
The number of the buried pipelines can be set and changed according to needs, and in the embodiment of the application, the number of the buried pipelines is not specifically limited.
Introduction of the voltage balancing device 3: in one possible implementation, with reference to fig. 2, the voltage balancing device 3 comprises: a power feed 31 and a directional drainage device 32;
a first end of the power feeding device 31 is electrically connected with the negative pole, a second end of the power feeding device 31 is electrically connected with a first end of the directional drainage device 32, and a second end of the directional drainage device 32 is used for being electrically connected with a protected buried pipeline;
a feeding point is formed at the electrical connection position of the feeding device 31 and the negative pole, and a voltage equalizing point is formed at the electrical connection position of the second end of the directional drainage device 32 and the protected buried pipeline;
directional drainage means 32 for balancing the voltage between the voltage equalizing point and the feeding point according to the voltage difference.
In this implementation, when the voltage difference is greater than the preset voltage difference, the voltage equalizing point is communicated with the feeding point, and the current at the voltage equalizing point flows to the feeding point or the current at the feeding point flows to the voltage equalizing point. Wherein, under the condition that the first voltage at voltage-sharing point is greater than the second voltage at feed point, and this voltage difference is greater than preset voltage difference, it indicates that the buried pipeline's of being protected voltage is higher, and under this condition, directional drainage device 32 communicates voltage-sharing point and feed point, and the electric current flows to the low-pressure area at feed point place from the high-pressure area at voltage-sharing point place, then flows back to external power supply 1's negative pole, realizes voltage difference dynamic balance to improve the protection effect to the buried pipeline of being protected.
Under the condition that the second voltage at the feed point is greater than the first voltage at the voltage equalizing point and the voltage difference is greater than the preset voltage difference, the voltage at the feed point is higher, in this case, the directional current drainage device 32 communicates the voltage equalizing point with the feed point, the current flows from the high-voltage area where the feed point is located to the low-voltage area where the voltage equalizing point is located, and then flows through the protected buried pipeline and flows back to the negative electrode of the external power supply 1, so that the dynamic balance of the voltage difference is realized, and the protection effect on the protected buried pipeline is improved.
And in the case that the voltage difference is not greater than the preset voltage difference, the directional drainage device 32 can disconnect the electrical connection between the voltage equalizing point and the feeding point.
It should be noted that in the case of lightning, or when the number of anodes 2 is multiple and one or more anodes 2 are in failure, the first voltage at the voltage equalizing point is greater than the second voltage at the feeding point. In both cases, the directional drainage device 32 connects the voltage equalizing point to the feeding point, and the current flows from the high-voltage region where the voltage equalizing point is located to the low-voltage region where the feeding point is located, thereby realizing the dynamic voltage adjustment.
In the embodiment of the present application, a feeding point is formed at an electrical connection position between a negative electrode of the external power supply 1 and the feeding device 31, and the external power supply 1 can further form a cathode protection region at the feeding point by supplying a stable current to the feeding point, so as to effectively block an electric field of the anode 2 from continuously diffusing outwards, so that the current is gathered in the limited protection region, and the overflow of the system current is reduced.
Introduction of power feeding device 31: in a possible implementation, the feeding means 31 is composed of a plurality of feeding electrodes connected in series or in parallel;
the chemical activity of the material of the feed electrode is better than that of the material of the protected buried pipeline.
In this implementation, the material of the feed electrode is more active than the material of the buried pipeline to be protected. For example, if the material of the buried pipeline to be protected is iron or iron alloy, the material of the feeding electrode is a material that is more reactive than iron, such as zinc alloy, aluminum alloy, or titanium alloy.
In a possible implementation, the feeder 31 is buried in an edge zone of a protected area in which the buried pipeline to be protected is located, at a depth not less than a first preset depth.
In this implementation, the power feeding device 31 is embedded in an edge section of the protection area, and the resistivity of the edge section is low.
In addition, the first preset depth may be set and changed as needed, for example, the first preset depth is 0.8 m or 1 m. That is, the buried depth of the power feeding device 31 is not less than 0.8 m or 1 m.
Introduction to the directional drainage device 32: in one possible implementation, the directional drain 32 is a bi-directional drain.
The bidirectional drainer can automatically conduct a high-voltage area and a low-voltage area, so that current flows from the high-voltage area to the low-voltage area, dynamic voltage adjustment in a protection area is realized, the total output current of a system can be effectively reduced, and the field protection effect is improved.
In one possible implementation, the bidirectional fluid drainage device may be a dc fluid drainage device or an ac fluid drainage device. In the embodiments of the present application, this is not particularly limited.
In the embodiment of the present application, the number of the voltage balancing devices 3 may be multiple according to actual situations, that is, the number of the power feeding device 31 and the directional drainage device 32 is multiple, so that the optimal voltage balance can be achieved.
Introduction of the external power supply 1: in a possible implementation manner, the external power supply 1 may be a direct current power supply or an alternating current power supply, which is not specifically limited in the embodiment of the present application. For example, the external power supply 1 is a dc power supply.
In a possible implementation manner, the voltage provided by the external power supply 1 may be set and changed as needed, which is not specifically limited in the embodiment of the present application.
In a possible implementation mode, the anode of the external power supply 1 and the anode 2 can be electrically connected through a cable, the cathode of the external power supply 1 and the protected buried pipeline can be electrically connected through a cable, the cathode of the external power supply 1 and the first end of the voltage balancing device 3 can also be electrically connected through a cable, and the voltage balancing device 3 and the protected buried pipeline can also be electrically connected through a cable.
The anode and the anode 2 can be electrically connected through an anode 2 cable, and the cathode and the protected buried pipeline can be electrically connected through a cathode cable.
Introduction of the anode 2: in a possible implementation manner, the burying depth of the anode 2 is not less than the second preset depth, and the number of the anodes 2 is multiple.
In this implementation, the anode 2 may be a deep well anode, buried below a second predetermined depth and placed in a vertical direction. And the distance between the anode 2 and the edge of the protected area where the protected buried pipeline is located is not less than the preset distance, so that the current distribution is more uniform, the voltage of the protected buried pipeline is kept consistent, and the protection effect on the protected buried pipeline is improved. In addition, the deep well anode can also reduce the corrosion interference to other metal equipment buried in the periphery.
The second preset depth may be set and changed as needed, and is not specifically limited in this embodiment of the application. For example, the second predetermined depth is 15 meters, that is, the anode 2 is buried under not less than 15 meters and is placed in a vertical direction. In addition, the anode 2 groove can be backfilled by metallurgical coke or calcined petroleum coke after the deep well anode 2 is laid.
In one possible implementation, the material of the deep well anode may be set and modified as required, for example, the material may be ferrosilicon or mixed metal oxide.
In a possible implementation, the number of anodes 2 can be set and modified as required, for example, the number of anodes 2 is 2, 3 or 4, etc. For example, a protection area where a buried pipeline to be protected is located forms a circle, under the condition that the number of the anodes 2 is 2, the 2 anodes may be respectively located at two sides of the protection area where the buried pipeline to be protected is located, and an included angle formed between the 2 anodes and the circle center is 180 ℃. In the case where the number of the anodes 2 is 3, the included angle formed between each 2 of the 3 anodes and the center of the circle is 120 ℃.
It should be noted that, in the cathodic protection system in the related art, the voltage in the protection area is different, the buried pipeline in some areas cannot achieve the expected protection effect, and the buried pipeline in some areas has an over-protection phenomenon, which greatly reduces the effective range of the regional cathodic protection, and causes the problems of overlarge output current of the external power supply 1, increased useless power, unstable system operation, high operation cost and the like, and is not suitable for the regional cathodic protection requirement of the gathering and transportation system in the well cluster construction mode.
The embodiment of the application provides a regional cathodic protection system, which is provided with a voltage balancing device 3, the device can balance the voltage between a voltage equalizing point and a feed point according to the voltage difference between the voltage equalizing point and the feed point, and realize the dynamic adjustment of the voltage in a protection area where a plurality of buried pipelines to be protected are positioned, so that the problems that the expected protection effect cannot be achieved in some areas, the buried pipelines in the areas are seriously corroded are solved, and the regional cathodic protection effect is improved.
The system can also solve the problems of uneven protection voltage, high current, small protection range, few protection facilities and the like of the buried pipeline in a well cluster construction mode, reduce the invalid output of the regional cathodic protection system, expand the effective range of the regional cathodic protection and improve the adaptability of the regional cathodic protection system.
The embodiment of the present application provides a regional cathodic protection method, referring to fig. 3, applied to the above-mentioned regional cathodic protection system, the method includes:
step 301: under the condition of electrifying, the first voltage at the voltage equalizing point and the second voltage at the feeding point are detected based on the current provided by the external power supply.
When energized, a first voltage at the voltage equalizing point and a second voltage at the power supply point, i.e. the voltages on both sides of the bidirectional drain, can be detected by the bidirectional drain.
The current provided by the external power supply can flow from the positive electrode to the negative electrode through at least one of the following implementation modes.
In the first implementation mode, the current provided by the external power supply flows from the positive electrode through the anode, the stratum where the protected buried pipeline is located and the protected buried pipeline and flows back to the negative electrode.
In the implementation mode, current provided by an external power supply flows out from the positive pole, flows to the positive pole through a cable, forms a loop with a protected buried pipeline through a stratum, and finally returns to the negative pole through the cable.
In a second implementation, the current provided by the external power source flows from the anode, through the ground layer, and through the feeding device, and back to the cathode.
In this implementation, an absolute value of a voltage difference between the first voltage at the voltage equalizing point and the second voltage at the feeding point is not greater than a preset voltage difference, that is, the voltage equalizing point and the feeding point are not communicated with each other, so that a current flows through the anode and the ground layer, and then flows back to the cathode from the feeding device through the cable.
In the third implementation mode, the current provided by the external power supply flows from the anode, the stratum, the protected buried pipeline, the directional drainage device and the feed device to the cathode.
In the implementation mode, under the condition that the first voltage at the voltage equalizing point is larger than the second voltage at the feed point and the absolute value of the voltage difference between the first voltage and the second voltage is larger than the preset voltage difference, the voltage equalizing point and the feed point are communicated, the current flows out of the positive electrode, flows to the positive electrode through the cable, flows to the protected buried pipeline through the stratum, then flows to the feed device through the directional drainage device, and finally flows back to the negative electrode through the cable.
In a fourth implementation mode, current provided by the external power supply flows from the positive electrode through the anode, the ground layer, the feeding device, the directional drainage device and the protected buried pipeline and flows back to the negative electrode.
In the implementation mode, under the condition that the second voltage at the feed point is greater than the first voltage at the voltage equalizing point and the absolute value of the voltage difference between the second voltage and the first voltage is greater than the preset voltage difference, the voltage equalizing point and the feed point are communicated, the current flows out from the anode, flows to the anode through the cable, flows to the feed device through the stratum, then flows to the protected buried pipeline through the directional drainage device, and finally flows back to the cathode through the cable.
Step 302: an absolute value of a voltage difference between the first voltage and the second voltage is determined.
In this step, the bidirectional drainer may first determine the first voltage and the second voltage, respectively, and then determine an absolute value of a voltage difference between the first voltage and the second voltage.
Step 303: the voltage between the voltage equalizing point and the feeding point is balanced according to the absolute value of the voltage difference.
In one possible implementation, in the case that the absolute value of the voltage difference is greater than the preset voltage difference, the bidirectional drain connects the voltage equalizing point and the feeding point so that the current at the voltage equalizing point flows to the feeding point or the current at the feeding point flows to the voltage equalizing point.
In this implementation, when the first voltage is greater than the second voltage and the absolute value of the voltage difference is greater than the preset voltage difference, the bidirectional drain connects the voltage equalizing point and the feeding point, and the current at the voltage equalizing point flows to the feeding point. And when the second voltage is greater than the first voltage and the absolute value of the voltage difference is greater than the preset voltage difference, the bidirectional current discharger communicates the voltage equalizing point with the feeding point, and the current at the feeding point flows to the voltage equalizing point.
In the embodiment of the application, under the condition that the voltage difference is greater than the preset voltage difference, the bidirectional drainage device automatically connects the voltage equalizing point with the feeding point, so that the current flows from the high-voltage area to the low-voltage area, the dynamic voltage adjustment in a protection area is realized, the total output current of the system is effectively reduced, and the field protection effect is improved.
In another possible implementation, the directional current collector breaks the electrical connection between the voltage grading point and the feeding point in a case where an absolute value of the voltage difference is not greater than a preset voltage difference.
The embodiment of the application provides a regional cathodic protection method, which balances the voltage between a voltage equalizing point and a feed point by determining the absolute value of the voltage difference between the voltage equalizing point and the feed point, and realizes the dynamic adjustment of the voltage in a protection area where a plurality of buried pipelines to be protected are located, so that the problems that the expected protection effect cannot be achieved in some areas and the buried pipelines in the areas are seriously corroded are solved, and the regional cathodic protection effect is improved.
The method can solve the problem of uneven cathodic protection potential of the oil-gas gathering and transportation pipeline in a well cluster construction mode, can also solve the problems of high current, small protection range, few protection facilities and the like, reduces the invalid output of a cathodic protection system, enlarges the effective range of cathodic protection, and improves the adaptability of regional cathodic protection.
The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A regional cathodic protection system, characterized in that the system comprises: the device comprises an external power supply, an anode and a voltage balancing device;
the anode of the external power supply is electrically connected with the anode, and the cathode of the external power supply is used for being electrically connected with a protected buried pipeline;
the negative electrode of the external power supply is also electrically connected with the first end of the voltage balancing device, and the second end of the voltage balancing device is used for being electrically connected with the protected buried pipeline;
the voltage balancing device and the electrical connection position of the protected buried pipeline form a voltage equalizing point, and the voltage balancing device and the electrical connection position of the negative electrode form a feed point;
the voltage balancing device is used for balancing the voltage between the voltage equalizing point and the feeding point according to the voltage difference between the first voltage at the voltage equalizing point and the second voltage at the feeding point.
2. The system of claim 1, wherein the voltage balancing device comprises: a feed device and a directional drainage device;
a first end of the feeding device is electrically connected with the negative pole, a second end of the feeding device is electrically connected with a first end of the directional drainage device, and a second end of the directional drainage device is used for being electrically connected with the protected buried pipeline;
the feeding point is formed at the electrical connection position of the feeding device and the negative electrode, and the voltage equalizing point is formed at the electrical connection position of the second end of the directional drainage device and the protected buried pipeline;
the directional drainage device is used for balancing the voltage between the voltage equalizing point and the feeding point according to the voltage difference.
3. The system of claim 2, wherein the directional drainage device is configured to connect the voltage equalizing point to the feeding point when the voltage difference is greater than a preset voltage difference, and the current at the voltage equalizing point flows to the feeding point or the current at the feeding point flows to the voltage equalizing point;
the directional drainage device is further configured to disconnect the electrical connection between the voltage equalizing point and the feeding point when the voltage difference is not greater than the preset voltage difference.
4. The system according to claim 2, wherein the feeding device is composed of a plurality of feeding electrodes connected in series or in parallel;
the chemical activity of the material of the feed electrode is superior to that of the material of the protected buried pipeline.
5. The system of claim 2, wherein the feeder is buried at an edge section of a protected area in which the buried pipeline to be protected is located, and the buried depth is not less than a first predetermined depth.
6. The system of claim 3, wherein the directional drainage device is a bidirectional drain.
7. The system of claim 1, wherein the anode has a burying depth not less than a second predetermined depth, and the number of anodes is plural.
8. A regional cathodic protection method, applied to the system of any one of claims 1 to 7, comprising:
under the condition of electrifying, detecting a first voltage at the voltage equalizing point and a second voltage at the feeding point on the basis of current provided by the external power supply;
determining an absolute value of a voltage difference between the first voltage and the second voltage;
balancing the voltage between the voltage-equalizing point and the feeding point according to the absolute value of the voltage difference.
9. The method of claim 8, wherein balancing the voltage between the voltage-sharing point and the feeding point according to the absolute value of the voltage difference comprises:
communicating the voltage equalizing point with the feeding point under the condition that the absolute value of the voltage difference is larger than the preset voltage difference, so that the current at the voltage equalizing point flows to the feeding point or the current at the feeding point flows to the voltage equalizing point;
and under the condition that the absolute value of the voltage difference is not larger than the preset voltage difference, the voltage-sharing point and the feeding point are disconnected.
10. The method of claim 8, wherein the current provided by the external power source flows from the positive electrode through the anode, the formation in which the protected buried pipeline is located, and the protected buried pipeline back to the negative electrode; and/or the presence of a gas in the gas,
the current provided by the external power supply flows from the anode, the stratum and the feed device to the cathode; and/or the presence of a gas in the atmosphere,
the current provided by the external power supply flows from the positive electrode through the anode, the stratum, the protected buried pipeline, the directional drainage device and the feed device and flows back to the negative electrode; and/or the presence of a gas in the gas,
the current provided by the external power supply flows from the anode, through the anode, the stratum, the feed device, the directional drainage device and the protected buried pipeline and flows back to the cathode.
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