CN108823575B - Cluster well cathode protection direct current distribution device, manufacturing method and protection method - Google Patents
Cluster well cathode protection direct current distribution device, manufacturing method and protection method Download PDFInfo
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- CN108823575B CN108823575B CN201810957813.8A CN201810957813A CN108823575B CN 108823575 B CN108823575 B CN 108823575B CN 201810957813 A CN201810957813 A CN 201810957813A CN 108823575 B CN108823575 B CN 108823575B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/20—Conducting electric current to electrodes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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Abstract
The invention provides a cluster well group cathode protection direct current distribution device, a manufacturing method and a protection method, which comprise a plurality of double-resistance sectional rotary varistors, wherein one end of each double-resistance sectional rotary varistor is connected with the cathode of a cathode protection direct current power supply, and the other end of each double-resistance sectional rotary varistor is respectively connected with a corresponding oil well sleeve or water well sleeve; the double-linkage resistance value sectional rotary rheostat is formed by connecting two single-linkage sectional rotary rheostats in parallel, and a metal protective box is arranged outside the double-linkage resistance value sectional rotary rheostats. The invention uses the resistance value subsection rotary rheostat to replace the traditional rotary rheostat without subsection, and has the characteristics of small volume, light weight, large direct current distribution power, small self consumption energy, large resistance value adjusting range, stable work and the like. The potential difference function between the wells is guaranteed to be balanced in the cathode protection process of the cluster well group, normal cathode protection current is provided for the cluster well group sleeve, and the sleeve is protected from corrosion.
Description
Technical Field
The invention belongs to the technical field of casing protection, and particularly relates to a cluster well group cathode protection direct current distribution device, a manufacturing method and a protection method.
Background
Along with the extension of the service time, the corrosion of the cluster well group sleeve is also serious, and the further exploitation of the oil field is directly influenced. Cluster well casing corrosion is dominated by outer wall corrosion and cathodic protection is a recognized effective technique for controlling external corrosion. Reasonable cathodic protection design will effectively extend the useful life of a cluster well casing. The cathode protection of the cluster well group is realized by connecting the negative electrode of the direct current power supply with each single well sleeve, and connecting the positive electrode of the direct current power supply with the grounding anode of the deep well, thereby forming a protection loop.
At present, a cluster well group cathode protection unit needs 1 power distribution cabinet, 1 silicon rectifying corrosion inhibitor and 1 direct current distribution cabinet, three cabinet bodies, the occupied area is large, the equipment weight is more than 600 kilograms, a special power distribution room needs to be built, and the carrying is laborious. The ceramic disc varistor group in the direct current distribution cabinet occupies a cabinet in large size due to the defects of conventional design, has small current distribution power, serious heat and the like, and a great part of direct current distribution cabinets are damaged each year, so that a great amount of maintenance cost is required. Because of no digital remote monitoring, management is not kept up, and management staff does not know for a long time, as a result, the cathode protection cabinet cannot provide normal cathode protection current for the cluster well group sleeve, and the sleeve cannot be protected and corroded.
In view of the foregoing, a new cluster well cathode protection high-power dc distribution device is needed to meet the requirements of the development of the cathode protection of the cluster well in the oil field.
Disclosure of Invention
The invention aims to provide a cathode protection direct current distribution device for a cluster well group, which changes cathode protection direct current distribution current of the cluster well group through changing resistance values, balances potential difference among wells, obtains optimal protection potential of a cluster well group sleeve and prevents electrochemical corrosion.
Another objective of the present invention is to provide a method for manufacturing a cathode protection dc distribution device for a cluster well system.
It is another object of the present invention to provide a method of cluster well casing cathodic protection.
The technical scheme provided by the invention is as follows:
the cluster well group cathode protection direct current distribution device comprises a plurality of double-resistance sectional rotary varistors, wherein one end of each double-resistance sectional rotary varistor is connected with the cathode of a cathode protection direct current power supply, and the other end of each double-resistance sectional rotary varistor is respectively connected with a corresponding oil well sleeve or water well sleeve;
the double-linkage resistance value sectional rotary rheostat is formed by connecting two single-linkage sectional rotary rheostats in parallel, and a metal protective box is arranged outside the double-linkage resistance value sectional rotary rheostats.
The single-linkage sectional rotary rheostat comprises a fixed stator I, a fixed rotor II, a sectional resistor I, a blade contact, a rotary rotor II, a sectional resistor II, a rotary shaft and a hollow cylindrical ceramic skeleton, wherein the hollow cylindrical ceramic skeleton is non-closed;
the first fixed stator and the second fixed stator are respectively and fixedly arranged at two notches at the top end of the hollow cylindrical ceramic skeleton, the rotating shaft is arranged at the center of the top of the hollow cylindrical ceramic skeleton, the fixed moving plate and the rotating moving plate are both connected with the rotating shaft, the first sectional resistor and the second sectional resistor are both wound on the hollow cylindrical ceramic skeleton by using resistance insulating materials and are fully distributed on the hollow cylindrical ceramic skeleton, and the first sectional resistor and the second sectional resistor are connected through a joint;
the first segmented resistor and the second segmented resistor are positioned on the polished surface of the resistor insulating material at the top of the hollow cylindrical ceramic skeleton and are conductive, and the blade contact at the end point of the rotary moving plate is contacted with the conductive part.
The two single-linkage sectional rotary varistors are connected in parallel through corresponding fixed stator I, fixed rotor II and fixed stator II by using short wires to form the double-linkage resistance sectional rotary varistors.
The resistor insulating material is an insulating constantan square wire, and the non-conductive parts of the first segmented resistor body and the second segmented resistor body are fixed on the hollow cylindrical ceramic skeleton through the high-temperature resistant insulating material.
The outer diameter of the hollow cylindrical ceramic skeleton is 100mm, the inner diameter is 60mm, and the thickness is 80mm.
The sliding stroke of the single-link segmented rotary rheostat is 320+/-5 degrees.
The dual-resistance sectional rotary rheostat is 1600W/5 omega, and the single-connection sectional rotary rheostat is 800W/10 omega.
The first segmented resistor body is wound on the hollow cylindrical ceramic skeleton by adopting an insulating constantan square wire with the length of 1mm multiplied by 1mm as a resistor insulating material, and the second segmented resistor body is wound on the hollow cylindrical ceramic skeleton by adopting an insulating constantan square wire with the length of 1.2mm multiplied by 1.2mm as a resistor insulating material.
A manufacturing method of a cluster well group cathode protection direct current distribution device comprises the following steps:
step 1), starting from one end of a hollow cylindrical ceramic skeleton, tightly winding an insulating constantan square wire of 1mm multiplied by 1mm by 8.3m on the hollow cylindrical ceramic skeleton for 80 circles, reserving 50mm to form a first segmented resistor, then winding an insulating constantan square wire of 1.2mm multiplied by 1.2mm by 18m on the hollow cylindrical ceramic skeleton for 120 circles, reserving 50mm before and after the winding, measuring a resistance value of the first segmented resistor as a second segmented resistor by a universal meter, measuring the resistance value of the second segmented resistor as 6 omega, cutting off redundant insulating constantan square wires, connecting the first segmented resistor with the second segmented resistor by a connector, welding the first fixed stator and the second segmented resistor by wave soldering, and connecting a fixed moving sheet and a rotating moving sheet with a rotating shaft;
step 2) winding the first segmented resistor and the second segmented resistor on the resistor insulating materials on the outer surface, the bottom surface and the inner surface of the hollow cylindrical ceramic skeleton, coating high-temperature resistant insulating paint on the hollow cylindrical ceramic skeleton, baking the single-connection segmented rotary rheostat for 24 hours in an oven at 200 ℃, taking out the single-connection segmented rotary rheostat, and then polishing the surface paint of the resistor insulating materials wound on the top of the hollow cylindrical ceramic skeleton by using a polishing machine to facilitate the contact of the blade contact carbon brush and constantan square wires. Measuring the resistance value to be 10 omega at the fixed stator I and the fixed stator II by using a universal meter, and completing the manufacturing of the single 800W/10 omega sectional rotary rheostat;
step 3) connecting two single-link 800W/10Ω sectional rotary varistors in parallel to form a duplex, connecting the corresponding fixed stator I, fixed rotor II and fixed stator II through a shorting wire, and measuring the resistance value of 5 Ω between the fixed stator I and the fixed stator II by using a universal meter to manufacture the 1600W/5Ω sectional rotary varistor.
A cathode protection method for cluster well group sleeve tube uses a cluster well group cathode protection DC distributor, one end of a plurality of double resistance value subsection rotary varistors of the cluster well group cathode protection DC distributor is connected with the cathode of a cathode protection DC power supply, the other end is respectively connected with a corresponding oil well sleeve or well sleeve, the anode of the cathode protection DC power supply is connected with a deep well grounding anode to form a protection loop, the potential difference between wells is balanced in the process of cluster well group cathode protection through the cluster well group cathode protection DC distributor, and normal cathode protection current is provided for the cluster well group sleeve tube, so that the sleeve tube is protected from corrosion.
The beneficial effects of the invention are as follows:
the invention provides the cluster well group cathode protection direct current distribution device, which replaces the traditional rotary rheostat which is not segmented by the resistance value segmented rotary rheostat, and changes the original 120 kg cathode protection direct current distribution cabinet into 30 kg cathode protection direct current distribution device. The DC power divider has the characteristics of small volume, light weight, high DC power distribution, low energy consumption, wide resistance value adjusting range, stable work and the like. The potential difference function between the wells is guaranteed to be balanced in the cathode protection process of the cluster well group, normal cathode protection current is provided for the cluster well group sleeve, and the sleeve is protected from corrosion.
Further details will be described below with reference to the accompanying drawings.
Drawings
Figure 1 is a schematic diagram of one implementation of a single segment rotary varistor;
fig. 2 is a top view of a duplex segmented rotary varistor;
FIG. 3 is a schematic diagram of the cathodic protection principle of the cluster well casing of the present invention.
In the figure: 1. fixing the first fixed sheet; 2. a fixed moving plate; 3. fixing the second stator; 4. a first segmented resistor body; 5. a joint; 6. a blade contact; 7. a rotary moving plate; 8. a second segmented resistor body; 9. a rotating shaft; 10. a hollow cylindrical ceramic skeleton; 11. an oil well casing; 12. a well casing; 13. an insulating flange; 14. a metal protective box.
Detailed Description
Example 1:
the embodiment provides a cluster well group cathode protection direct current distribution device, which comprises a plurality of double-resistance sectional rotary varistors, wherein one end of each double-resistance sectional rotary varistor is connected with the cathode of a cathode protection direct current power supply, and the other end of each double-resistance sectional rotary varistor is respectively connected with a corresponding oil well sleeve 11 or a corresponding water well sleeve 12;
the double-resistance sectional rotary rheostat is formed by connecting two single-connection sectional rotary rheostats in parallel, and a metal protective box 14 is arranged outside the double-connection resistance sectional rotary rheostats.
The metal protective box 14 shell prevents dust from falling on the resistor body and affecting the contact of the carbon brush of the blade contact 6, so that the stable output of current from the fixed moving plate 2 is ensured. The front end of the rotating shaft 9 is provided with an adjusting hand wheel, so that the resistance change value can be conveniently adjusted.
The invention adopts the resistance value sectional rotary rheostat to replace the traditional rotary rheostat which is not sectional, has large direct current distribution power, small energy consumption, large resistance value adjusting range and stable work, and simultaneously greatly reduces volume and weight. Ensuring the potential difference function between the balance wells in the cathode protection process of the cluster well group. Providing normal cathodic protection current to the cluster well string casing, so that the casing is protected from corrosion.
Example 2:
on the basis of embodiment 1, the embodiment provides a cluster well group cathode protection direct current distribution device, wherein the single-connection segmented rotary rheostat comprises a fixed stator I1, a fixed rotor II 2, a fixed stator II 3, a segmented resistor I4, a blade contact 6, a rotary rotor 7, a segmented resistor II 8, a rotary shaft 9 and a hollow cylindrical ceramic skeleton 10, and the hollow cylindrical ceramic skeleton 10 is in a non-closed shape;
the first fixed stator 1 and the second fixed stator 3 are respectively and fixedly arranged at two notches at the top end of the hollow cylindrical ceramic skeleton 10, the rotating shaft 9 is arranged at the center of the top of the hollow cylindrical ceramic skeleton 10, the fixed moving plate 2 and the rotating moving plate 7 are both connected with the rotating shaft 9, the first sectional resistor body 4 and the second sectional resistor body 8 are both wound on the hollow cylindrical ceramic skeleton 10 by using resistance insulating materials, the hollow cylindrical ceramic skeleton 10 is fully distributed with the first sectional resistor body 4 and the second sectional resistor body 8, and the first sectional resistor body 4 and the second sectional resistor body 8 are connected through a joint 5;
the surfaces of the resistance insulating materials of the first segmented resistor body 4 and the second segmented resistor body 8 which are positioned on the top of the hollow cylindrical ceramic skeleton 10 are conductive, and the blade contact 6 at the end point of the rotary moving plate 7 is in contact with the conductive part.
The single segment rotary varistor is shown in fig. 1. The two single-linkage sectional rotary varistors are connected in parallel through corresponding fixed stator I1, fixed rotor 2 and fixed stator II 3 by using short wires to form the double-linkage resistance sectional rotary varistors.
In this embodiment, the resistive insulating material is an insulating constantan square wire, and the non-conductive parts of the first segment resistor body 4 and the second segment resistor body 8 are fixed on the hollow cylindrical ceramic skeleton 10 through a high-temperature resistant insulating material.
Example 3:
the embodiment provides a manufacturing method of a cluster well group cathode protection direct current distribution device (taking a duplex 1600W/5 omega resistance value segmented rotary rheostat as an example) which comprises the following steps:
step 1), starting from one end of a hollow cylindrical ceramic skeleton 10, tightly winding an insulating constantan square wire of 1mm multiplied by 1mm by 8.3m on the hollow cylindrical ceramic skeleton for 80 circles, reserving 50mm as a first segmented resistor body 4, then winding an insulating constantan square wire of 1.2mm multiplied by 1.2mm by 18m on the hollow cylindrical ceramic skeleton for 120 circles, reserving 50mm before and after the winding, measuring the resistance value of the first segmented resistor body 4 as a second segmented resistor body 4 omega by a universal meter, measuring the resistance value of the second segmented resistor body 6 omega, cutting off the redundant insulating constantan square wire, connecting the first segmented resistor body and the second segmented resistor body by a connector 5, respectively welding the first fixed stator piece 1, the second fixed stator piece 3 and the second segmented resistor body by wave soldering sheets, and connecting the first fixed stator piece 2 and the second rotary piece 7 with a rotary shaft 9;
step 2) winding the first and second segment resistors on the resistor insulating materials on the outer surface, the bottom surface and the inner surface of the hollow cylindrical ceramic skeleton 10, coating high-temperature resistant insulating paint on the hollow cylindrical ceramic skeleton 10, baking the single-link segment rotary rheostat for 24 hours in an oven at 200 ℃, taking out the single-link segment rotary rheostat, and then polishing the surface paint of the resistor insulating materials wound on the top of the hollow cylindrical ceramic skeleton 10 by a polishing machine to facilitate the contact of the carbon brush of the blade contact 6 with constantan square wires. Measuring the resistance value to be 10Ω at the first fixed stator 1 and the second fixed stator 3 by using a universal meter, and completing the manufacture of the single 800W/10Ω sectional rotary rheostat;
step 3) connecting two single-link 800W/10Ω sectional rotary varistors in parallel to form a duplex, and connecting corresponding fixed stator I1, fixed rotor 2 and fixed stator II 3 by short-circuit wires (3 pieces 4 mm) 2 Copper wire) and then measuring the resistance value of 5 omega at the fixed stator I and the fixed stator II 3 by using a universal meter, thus the 1600W/5 omega resistance value sectional rotary rheostat can be manufactured. The sectional rotary rheostat with the duplex 1600W/5 omega resistance is shown in figure 2.
Wherein, in order to reduce the volume and increase the power, a sectional resistor body is adopted to manufacture the single 800W/10 omega sectional rotary rheostat. Power value according to the formula: p=i 2 R is represented by the formula: p is power (W); i is the current (A) through the resistor; r is the resistance value (omega) of the resistor. 800 =i 2 The rated current i=9a is 10, 4A current is provided for a long term for the on-site oil-water well casing 12, the well current is passed through for 2 hours and 5A only for the new well, the resistance value of the oil-water well casing 12 is (1 omega-4Ω), the resistance value of the rear part is usually only used, the resistance value of the front part is rarely used, and the resistor grouping can be realized by the single 800W/10Ω sectional rotary rheostat.
Because the prior cathode protection digital remote monitoring cabinet changes the original three cabinet bodies into one cabinet body, the cabinet body is internally provided with the cathode protection digital remote monitoring cabinetThe temperature cannot exceed 40 ℃, and the surface temperature of the single 800W/10Ω sectional rotary rheostat cannot exceed 50 ℃, so that the single 800W/10Ω sectional rotary rheostat cannot have too large current passing through at ordinary times. Copper wire according to practical experience: 1mm of 2 Can pass 7A current, 1.2mm 2 Can pass 8A current, 1.4mm 2 A 9A current is passed, i.e. a round wire 1.13mm in diameter is passed through a 7A current, a round wire 1.24mm in diameter is passed through an 8A current, and a round wire 1.36mm in diameter is passed through a 9A current. The square wire with the side length of 1mm can pass 7A current, the square wire with the side length of 1.1mm can pass 8A current, and the square wire with the side length of 1.2mm can pass 9A current.
Constantan is a resistance alloy with copper and nickel as main components, and is characterized in that: has lower temperature coefficient of resistance, wider use temperature range (below 480 ℃), good processing performance and good welding performance. For a constantan resistor of uniform cross section, the resistance value r=ρl/a (Ω), where: ρ is the resistivity (Ω·m) of the resistive insulating material; l is the length (m) of the resistor; a is the cross-sectional area (mm) of the resistor 2 ). The resistance value is 10Ω, the front resistor 1 is 4Ω, and the rear resistor 2 is 6Ω. Constantan resistivity ρ=0.48±0.03m/mm 2 Segment resistor-4 resistance insulation material length calculation: 4=0.48L 1 /A 1 , L 1 =4A 1 0.48=4×1/0.48=8.3 m; and (3) calculating the length of the segmented resistor body II 8-resistance insulating material: 6=0.48L 1 /A 1 ，L 1 =6A 1 0.48=6×1.44/0.48=18 m. The first 4-resistance insulation material of the sectional resistor body adopts an insulated constantan square wire with the length of 1mm multiplied by 1mm to wind 80 circles on a hollow cylindrical ceramic skeleton, the resistance value is 4 omega, the second 8-resistance insulation material of the sectional resistor body adopts an insulated constantan square wire with the length of 1.2mm multiplied by 1.2mm to wind 120 circles on the hollow cylindrical ceramic skeleton, the resistance value is 6 omega, the total resistance value is 10 omega, the requirement that 4A current is supplied to an oil-water well at ordinary times is met, and the maximum passing current is 9A is met, wherein the first 4-minute power of the sectional resistor body is 320W, the second 8-minute power of the sectional resistor body is 480W, the power becomes 800W after the series connection, and the resistance is 10 omega. Two 800W/10 omega single-connection sectional rotary varistors are connected in parallel to form a sectional rotary varistor with a resistance value of 1600W/5 omega after being connected in parallel, and the sectional rotary varistor is characterized in thatWhen the surface temperature is not more than 50 ℃, 18A current can be passed.
In order to conveniently connect the first sectional resistor body 4 and the second sectional resistor body 8 through the joint 5, the first sectional resistor body 4 and the second sectional resistor body 8 are coated with insulating paint and are removed by sand paper, and the constantan has good welding performance and a wider use temperature range (below 480 ℃), and is welded by wave soldering.
In order to reduce the occupied area, a hollow cylindrical ceramic skeleton 10 is adopted, wherein the outer diameter is 100mm, the inner diameter is 60mm, and the thickness is 80mm. The moisture resistance is good, stable working performance, high heat dissipation speed and attractive and novel appearance. The resistor insulating material is coated with high-temperature-resistant enamel paint except the contact surface and is adhered to the ceramic skeleton.
The rotating shaft 9 drives the blade contact 6 to slide so as to obtain a variable resistance value, change the cathode protection direct current distribution current of the cluster well group, balance the potential difference among the wells, ensure that the cluster well group sleeve obtains the optimal protection potential and prevents electrochemical corrosion.
A voltage of 0-60V is applied between a fixed stator I1 and a fixed stator II 3 of the single 800W/10 omega sectional rotary rheostat, and the current is changed from 0-12A. 60V voltage is applied between the fixed stator I and the fixed stator II 3, the rotating shaft 9 rotates, the sliding stroke is 0-320 degrees, the voltage between the fixed stator I and the fixed stator II 3 continuously changes by 0-60V, the rheostat is repeatedly rotated at 0-320 degrees to control the rotating shaft 9, the rheostat has no visible damage, and the surface temperature of the segmented rotary rheostat is not more than 50 ℃ after 24 hours of power-on. Then a plurality of duplex 1600W/5 omega resistance value subsection rotary varistors are arranged in the upper cabinet of the cathodic protection digital monitoring cabinet to form a high-power direct current distribution device. The device has the characteristics of small volume, light weight, high power, low energy consumption, wide adjustment range, stable work and the like.
Example 4:
the embodiment provides a cluster well group casing cathode protection method, which uses a cluster well group cathode protection direct current distribution device, wherein one end of a plurality of double-resistance-value sectional rotary varistors of the cluster well group cathode protection direct current distribution device is connected with the cathode of a cathode protection direct current power supply, the other end of the double-resistance-value sectional rotary varistors are respectively connected with a corresponding oil well casing 11 or a corresponding water well casing 12, the anode of the cathode protection direct current power supply is connected with a deep well grounding anode to form a protection loop, and the potential difference between wells is balanced in the process of cluster well group cathode protection through the cluster well group cathode protection direct current distribution device, so that normal cathode protection current is provided for the cluster well group casing, and the casing is protected from corrosion.
In order to adapt to the severe environment outside an oil field, increase the operation reliability and reduce the cost, the cathode protection process of the cluster well group adopts a well group as a unit and a casing pipe as a key point to establish a cathode protection system. The cathode protection of the cluster well group is realized by connecting the negative electrode of the direct current power supply with each single well sleeve, and connecting the positive electrode of the direct current power supply with the grounding anode of the deep well, thereby forming a protection loop. The DC distributor mainly controls the output current of each single well and balances the potential difference between the wells. As shown in fig. 3. The insulating flange 13 acts to mainly prevent the other unprotected pipe line from interfering with corrosion by stray currents of the cathodic protection system.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention. The components and structures not specifically described in the embodiments are well known in the art and commonly used structures or common means, and are not described here.
Claims (8)
1. A cluster well group cathode protection direct current distribution device is characterized in that: the device comprises a plurality of double-resistance sectional rotary varistors, wherein one end of each double-resistance sectional rotary varistor is connected with the cathode of a cathode protection direct current power supply, and the other end of each double-resistance sectional rotary varistor is respectively connected with a corresponding oil well casing (11) or a corresponding water well casing (12);
the double-linkage resistance value sectional rotary rheostat is formed by connecting two single-linkage sectional rotary rheostats in parallel, and a metal protective box (14) is arranged outside the double-linkage resistance value sectional rotary rheostats;
the single-linkage segmented rotary rheostat comprises a fixed stator I (1), a fixed rotor II (2), a fixed stator II (3), a segmented resistor I (4), a blade contact (6), a rotary rotor II (7), a segmented resistor II (8), a rotary shaft (9) and a hollow cylindrical ceramic skeleton (10), wherein the hollow cylindrical ceramic skeleton (10) is non-closed;
the first fixed stator (1) and the second fixed stator (3) are respectively and fixedly arranged at two notches at the top end of the hollow cylindrical ceramic skeleton (10), the rotating shaft (9) is arranged at the center of the top of the hollow cylindrical ceramic skeleton (10), the first fixed rotor (2) and the second rotary rotor (7) are connected with the rotating shaft (9), the first sectional resistor (4) and the second sectional resistor (8) are wound on the hollow cylindrical ceramic skeleton (10) by using resistor insulating materials, the hollow cylindrical ceramic skeleton (10) is fully distributed by the first sectional resistor (4) and the second sectional resistor (8) and are connected by a joint (5);
the first segmented resistor body (4) and the second segmented resistor body (8) are positioned on the surface of a resistor insulating material at the top of the hollow cylindrical ceramic skeleton (10) and are conductive, and a blade contact (6) at the end point of the rotary moving plate (7) is in contact with the conductive part of the resistor insulating planing surface;
the two single-linkage sectional rotary varistors are connected in parallel through corresponding fixed stator I (1), fixed rotor II (2) and fixed stator II (3) by using short wires to form the double-linkage resistance sectional rotary varistors.
2. The cluster well group cathode protection dc distribution device according to claim 1, wherein: the resistor insulation material is an insulating constantan square wire, and the non-conductive parts of the first segmented resistor body (4) and the second segmented resistor body (8) are fixed on the hollow cylindrical ceramic skeleton (10) through the high-temperature resistant insulation material.
3. The cluster well group cathode protection dc distribution device according to claim 1, wherein: the outer diameter of the hollow cylindrical ceramic skeleton (10) is 100mm, the inner diameter is 60mm, and the thickness is 80mm.
4. The cluster well group cathode protection dc distribution device according to claim 1, wherein: the sliding stroke of the single-link segmented rotary rheostat is 320+/-5 degrees.
5. The cluster well group cathode protection dc distribution device according to claim 1, wherein: the dual-resistance sectional rotary rheostat is 1600W/5 omega, and the single-connection sectional rotary rheostat is 800W/10 omega.
6. The cluster well group cathode protection dc distribution device according to claim 1, wherein: the first segmented resistor body (4) is wound on the hollow cylindrical ceramic skeleton by adopting an insulating constantan square wire with the length of 1mm multiplied by 1mm as a resistor insulating material, and the second segmented resistor body (8) is wound on the hollow cylindrical ceramic skeleton by adopting an insulating constantan square wire with the length of 1.2mm multiplied by 1.2mm as a resistor insulating material.
7. The method for manufacturing a cluster well group cathode protection dc distribution device according to claim 5, comprising the steps of:
step 1) starting from one end of a hollow cylindrical ceramic skeleton (10), tightly winding an insulating constantan square wire of 1mm multiplied by 1mm by 8.3m on the hollow cylindrical ceramic skeleton for 80 circles, reserving 50mm as a first segmented resistor body (4), then winding an insulating constantan square wire of 1.2mm multiplied by 1.2mm by 18m on the hollow cylindrical ceramic skeleton for 120 circles, reserving 50mm before and after, and reserving 50mm as a second segmented resistor body, measuring the resistance value of the first segmented resistor body (4) to be 4Ω, measuring the resistance value of the second segmented resistor body to be 6Ω by a universal meter, cutting off the redundant insulating constantan square wire, connecting the first segmented resistor body (1) with the first segmented resistor body (4), the second fixed stator body (3) with the second segmented resistor body by wave soldering, and connecting a first fixed rotor sheet (2) with a rotary rotor sheet (7) with a rotary shaft (9);
step 2) winding a first segmented resistor and a second segmented resistor on the resistor insulating materials on the outer surface, the bottom surface and the inner surface of the hollow cylindrical ceramic skeleton (10) respectively, coating high-temperature resistant insulating paint on the hollow cylindrical ceramic skeleton (10), baking the single-connection segmented rotary rheostat for 24 hours in an oven at 200 ℃, taking out the single-connection segmented rheostat, and then polishing the surface paint of the resistor insulating materials wound on the top of the hollow cylindrical ceramic skeleton (10) by a planer to facilitate the contact of a carbon brush of a blade contact (6) with a constantan square wire; measuring the resistance value to be 10Ω in the first fixed stator (1) and the second fixed stator (3) by using a universal meter, and completing the manufacturing of the single 800W/10Ω sectional rotary rheostat;
step 3) connecting two single-connection 800W/10 omega sectional rotary varistors in parallel to form a double-connection, connecting the corresponding fixed stator I (1), fixed rotor II (2) and fixed stator II (3) through short wires, and measuring the resistance value of 5 omega between the fixed stator I (1) and the fixed stator II (3) by using a universal meter to manufacture the 1600W/5 omega sectional rotary varistors.
8. A method for protecting a cluster well casing cathode using the cluster well casing cathode protecting dc distribution device according to claim 1, comprising: one end of each of the plurality of double-resistance sectional rotary varistors of the cluster well group cathode protection direct current distribution device is connected with the negative electrode of the cathode protection direct current power supply, the other end of each of the plurality of double-resistance sectional rotary varistors is connected with the corresponding oil well sleeve (11) or the corresponding water well sleeve (12), the positive electrode of the cathode protection direct current power supply is connected with the grounding anode of the deep well to form a protection loop, potential differences among wells are balanced in the cluster well group cathode protection process through the cluster well group cathode protection direct current distribution device, normal cathode protection current is provided for the cluster well group sleeve, and the oil well sleeve (11) or the water well sleeve (12) are protected from corrosion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957813.8A CN108823575B (en) | 2018-08-22 | 2018-08-22 | Cluster well cathode protection direct current distribution device, manufacturing method and protection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810957813.8A CN108823575B (en) | 2018-08-22 | 2018-08-22 | Cluster well cathode protection direct current distribution device, manufacturing method and protection method |
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| Publication Number | Publication Date |
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| CN108823575A CN108823575A (en) | 2018-11-16 |
| CN108823575B true CN108823575B (en) | 2023-08-18 |
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| CN201810957813.8A Active CN108823575B (en) | 2018-08-22 | 2018-08-22 | Cluster well cathode protection direct current distribution device, manufacturing method and protection method |
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| CN109616842B (en) * | 2019-01-07 | 2020-06-19 | 苏州浪潮智能科技有限公司 | Impedance connector |
| CN111926336A (en) * | 2020-08-07 | 2020-11-13 | 中国石油天然气集团有限公司 | Flange type multi-lead deep well anode device and manufacturing method |
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