CN107236960B - A kind of impressed current cathode protection device for oil expeller - Google Patents
A kind of impressed current cathode protection device for oil expeller Download PDFInfo
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- CN107236960B CN107236960B CN201710483330.4A CN201710483330A CN107236960B CN 107236960 B CN107236960 B CN 107236960B CN 201710483330 A CN201710483330 A CN 201710483330A CN 107236960 B CN107236960 B CN 107236960B
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- oil expeller
- impressed current
- inner cavity
- anode
- cable
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The present invention relates to a kind of impressed current cathode protection devices for oil expeller comprising: impressed current anode is arranged in intracavitary in oil expeller, and can be in contact with the liquid in inner cavity；DC power supply, anode is connected with impressed current anode, and its cathode is connected with the metal cavity wall of the inner cavity of oil expeller and metal component；Under the action of DC power supply, reduction reaction occurs for the metal cavity wall of the inner cavity of oil expeller, and oxidation reaction occurs for impressed current anode.The metal cavity wall that the present invention can more efficiently prevent from the inner cavity of oil expeller is corroded, to reinforce the protection effect to oil expeller.
Description
Technical field
The invention belongs to field mining equipment fields, and in particular to a kind of impressed current cathodic protection dress for oil expeller
It sets.
Background technique
Oil expeller is one of the important equipment in the defeated treatment process of oil field development oil gas water collection, since its internal structure is multiple
It is miscellaneous, and the corrosive medium handled is strong, operating condition difference is big, under mechanics and the collective effect of complicated electrochemical corrosion, inner cavity
Metal cavity wall can be corroded so that serious curtailment oil expeller service life.If oil expeller corrosion failure problem is frequently sent out
It is raw, cause oil expeller function that cannot effectively play, oil, the defeated processing system of gas and water collection normally produce where not only directly affecting
Operation, while also increasing site operation personnel's management difficulty, oil caused by perforation, gas and water leakage will affect safety in production operation
And environmental pollution hidden danger is brought, the workload and production run for increasing operator are frequently repaired as well as oil expeller
Cost.
There are three types of the measures for preventing oil expeller corrosion from generalling use in the prior art: first is that inner coating protection technology；Second is that
Corrosion inhibiter guard technology.However in actual application process, since the structure inside oil expeller is complex, both measures
Anticorrosion ability it is bad, therefore a kind of need inner cavity that can more efficiently prevent from oil expeller metal cavity wall is corroded
Device.
Summary of the invention
Based on the above issues, the object of the present invention is to provide a kind of impressed current cathode protection device for oil expeller,
The metal cavity wall that the inner cavity of oil expeller can be more efficiently prevented from is corroded, to reinforce the protection effect to oil expeller.
The present invention provides a kind of impressed current cathode protection device for oil expeller comprising: impressed current anode, setting exist
In the inner cavity of the oil expeller, and it can be in contact with the liquid in the inner cavity；DC power supply, anode and the impressed current anode
It is connected, and its cathode is connected with the metal cavity wall of the inner cavity of the oil expeller；Under the action of the DC power supply, the oil removing
Reduction reaction occurs for the metal cavity wall of the inner cavity of device, and oxidation reaction occurs for the impressed current anode.
Preferably, the protection potential of the metal cavity wall of the inner cavity of the oil expeller is -1.5~-0.85V, and protective current is close
Degree is 20~50mA/m2。
Preferably, the DC power supply includes potentiostat, and intracavitary be equipped with can be with the inner cavity in the oil expeller
In the reference electrode that is in contact of liquid, the reference terminals of the potentiostat are connected with the reference electrode, and its zero-bit
Terminals are connected with ground.
Preferably, the shape of the impressed current anode is tubulose, and the impressed current anode is arranged along the oil expeller
The flow direction of interior liquid extends.
Preferably, the material of the impressed current anode is magnesium alloy.
Preferably, the quantity of the impressed current anode is multiple.
Preferably, the material of the reference electrode is Ag or Agcl.
Preferably, further include the anode cable for connecting the positive terminal and the impressed current anode of the potentiostat, connect
It connects the negative terminals of the potentiostat and the cathode cable of the metal cavity wall of the inner cavity of the oil expeller, connect the permanent electricity
The reference terminals of position instrument are with the reference cable of the reference electrode and connect zero-bit terminals and the ground of the potentiostat
Zero-bit cable；The cable that the inside of the oil expeller is equipped with the fixed anode cable, cathode cable and reference cable is solid
Determine stake.
Preferably, further include explosion-proof wiring box, each terminals of the potentiostat pass through the explosion-proof wiring box with
The inside or ground of the oil expeller are connected.
Impressed current cathode protection device according to the present invention for oil expeller passes through setting DC power supply and auxiliary sun
Pole, and using impressed current anode as anode constitutes current supply circuit using the metal cavity wall of the inner cavity of oil expeller as cathode, force electric current by
Liquid flow direction in oil expeller needs the metal cavity wall of the inner cavity of protected oil expeller.In the process, by adjusting direct current
The size of the output electric current and output voltage of power supply, so that the current potential of metal cavity wall has been at the state lower than ambient enviroment
Under, the cavity wall of the inner cavity of such oil expeller would not corrode because electronics is lost.Therefore, of the invention to be used for oil expeller
The metal cavity wall of the impressed current cathode protection device inner cavity that can be effectively prevented oil expeller be corroded, extend oil expeller
Service life, have broad application prospects in the defeated process for producing technique of oil field development oil gas water collection.In addition, this is used to remove
The impressed current cathode protection device structure of oily device is simple, and input cost is low, convenient for widely promoting and applying.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is the structural schematic diagram of the impressed current cathode protection device according to the present invention for oil expeller.
Description of symbols: 1, oil expeller；2, impressed current anode；3, DC power supply；4, reference electrode；5, anode cable；6,
Cathode cable；7, reference cable；8, zero-bit cable；9, explosion-proof wiring box；10, cable spud pile；31, potentiostat.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be only used as example, and cannot be used as a limitation and limit protection model of the invention
It encloses.
Fig. 1 is the structural schematic diagram of the impressed current cathode protection device according to the present invention for oil expeller, such as Fig. 1 institute
Show, which includes: impressed current anode 2, be arranged in it is intracavitary in oil expeller 1, and can in inner cavity
Liquid is in contact；DC power supply 3, anode are connected with impressed current anode 2, and the metal cavity wall of the inner cavity of its cathode and oil expeller 1.
The cathode of DC power supply can also be connected with the perishable metal component of oil expeller inner cavity, realize the anticorrosion of metal component.Separately
Outside, so-called DC power supply is to refer to provide direct current to the metal cavity wall of the inner cavity of impressed current anode 2 and oil expeller 1 herein
Device.Under the action of DC power supply 3, the metal cavity wall of the inner cavity of oil expeller 1 occur electronics reduction reaction, and assist sun
The oxidation reaction of the generation of pole 2 betatopic.
Impressed current cathode protection device according to the present invention for oil expeller passes through setting DC power supply 3 and auxiliary
Anode 2, and be anode with impressed current anode 2, using the metal cavity wall of the inner cavity of oil expeller 1 as cathode, current supply circuit is constituted, electricity is forced
Stream is needed the metal cavity wall of the inner cavity of protected oil expeller 1 by the liquid flow direction in oil expeller 1.In the process, pass through tune
The size for saving the output electric current and output voltage of DC power supply 3, so that the current potential of metal cavity wall has been at lower than ambient enviroment
In the state of, the cavity wall of the inner cavity of such oil expeller 1 would not corrode because electronics is lost.Therefore, use of the invention
Metal cavity wall in the inner cavity that the impressed current cathode protection device of oil expeller 1 can be effectively prevented oil expeller 1 is corroded, and prolongs
The service life for having grown oil expeller 1 has broad application prospects in the defeated process for producing technique of oil field development oil gas water collection.Separately
Outside, this be used for oil expeller 1 impressed current cathode protection device structure it is simple, input cost is low, convenient for widely promoting and applying.
During implementing cathodic protection to oil expeller, protection potential and protecting current density are two very important
Parameter.Protection potential be make the inner cavity of oil expeller metal cavity wall etching-stop or it is negligible when potential value.Cathodic protection
Effect is directly related with protection potential value, and in the material of the inner cavity of protection potential and oil expeller and oil expeller liquid group
It is related at, factors such as temperature, concentration.Protecting current density is the corrosion for the metal cavity wall of inner cavity for instigating oil expeller to most
When small degree, the size of required additional protective current on unit area.The protecting current density also material with the inner cavity of oil expeller 1
The factors such as the composition of liquid, concentration, temperature are related in matter and oil expeller.Protecting current density is too small, then does not have protection
Effect, and the excessive metal erosion speed that will also result in is accelerated.In the present embodiment, the metal cavity wall of the inner cavity of oil expeller 1 is selected
Protection potential be -1.5~-0.85V, protecting current density be 20~50mA/m2.It is proved through inventor's many experiments, when removing
The protection potential and protecting current density of the metal cavity wall of the inner cavity of oily device 1 within the above range when, oil expeller anticorrosion effect
Fruit is best.
Above-mentioned 3 equipment of DC power supply may include the rectifier equipment that electric main can be changed into direct current, thermoelectricity hair
Raw device, sealing and circulating steam-driven generator, wind-driven generator, solar battery or large-capacity battery etc., and can will exchange city
The rectifier equipment that electricity is converted to direct current includes rectifier, potentiostat, galvanostat etc..
In a preferred embodiment, DC power supply 3 includes potentiostat 31, intracavitary in oil expeller 1 to be equipped with energy
The reference terminals of the reference electrode 4 being in contact with the liquid in inner cavity, potentiostat 31 are connected with reference electrode 4, and its zero
Position terminals are connected with ground.Wherein, since Ag and Agcl has high-temperature stability and excellent electrochemical stability, reference
The material of electrode 4 is selected as Ag or Agcl.In the actual operation process, it needs to connect each terminals of potentiostat 31
Afterwards, potentiostat 31 is opened, and the protective current value after converting using protection potential and according to protecting current density is controlled as given
Signal processed inputs potentiostat 31.The working principle of potentiostat 31 are as follows: the given control signal in potentiostat 31 will be inputted
Potential value and the potential value of the reference electrode 4 after impedance transformer is isolated be sent into comparison amplifier together, through high-precision,
After the comparison amplifier of high stability compares amplification, output error controls signal, this signal is sent into phase shift trigger, phase shift touching
Device is sent out according to the size of the signal, automatically adjusts the phase shift time of pulse, trigger pulse is exported by pulse transformer and adjusts pole
Change the angle of flow silicon-controlled in circuit, changes the size of output voltage, electric current, so that the metal cavity wall of the inner cavity of oil expeller 1
Potential value is equal to the potential value in given control signal.In addition, potentiostat 31 also has operating status automatic switching function, when
It can not carry out when constant potential control (such as 4 circuit of reference electrode is opened a way), potentiostat 31 can be cut from constant potential working condition automatically
Constant current working condition is changed to, so that output current value is equal to the protective current value in given control signal.By using permanent electricity
Position instrument 31, without manually controlling, without setting other electric currents, voltage-operated device, it will be able to it realizes and automatically controls, so that
The potential value of the metal cavity wall of the inner cavity of oil expeller 1 is in the range of protection potential, easy to operate, and operating cost is lower.
In the present embodiment, 2 shape of impressed current anode is tubulose, and material is magnesium alloy, and impressed current anode 2 is arranged along
The flow direction of liquid extends in oil expeller 1.Tubulose is set by impressed current anode 2, along the stream of liquid in oil expeller 1 when installation
Dynamic direction extends, and on the one hand can be avoided the flowing for influencing liquid in oil expeller 1, on the other hand can also reduce in oil expeller 1
Impact of the liquid to impressed current anode 2.Furthermore, it is contemplated that working environment of this impressed current cathode protection device in oil expeller 1
For the water environment of high salinity, the material of impressed current anode 2 is selected as magnesium alloy.The impressed current anode 2 of magnesium alloy material has good
Good electric conductivity and corrosion resistance, service life are longer.In addition, the impressed current anode 2 of magnesium alloy material also has enough machinery
Strength and stability can bear certain stress in maintenance and the course of work.
Preferably, the quantity of impressed current anode 2 is multiple.There is chamber since oil expeller 1 has, in order to guarantee each chamber more
There is good anticorrosion ability, required for determining according to the size of each chamber, area and required protecting current density
2 quantity of impressed current anode and its installation site.In addition, having a certain distance between impressed current anode 2 and the bottom of oil expeller 1.
Preferably, the distance between the bottom of impressed current anode 2 and oil expeller 1 is the one third of the liquid level of oil expeller 1, to guarantee
No matter when impressed current anode 2 can be below the liquid level in oil expeller 1.
In the present embodiment, the impressed current cathode protection device further include connect potentiostat 31 positive terminal with
The yin of the metal cavity wall of the inner cavity of the anode cable 5 of impressed current anode 2, the negative terminals for connecting potentiostat 31 and oil expeller 1
Pole cable 6, the reference terminals and the reference cable 7 of reference electrode 4 that connect potentiostat 31 and it connect the zero of potentiostat 31
The zero-bit cable 8 of position terminals and ground；The inside of oil expeller 1 is equipped with fixed anode cable 5, cathode cable 6 and reference cable 7
Cable spud pile 10.In the cavity wall for the inner cavity that each cable can be stably mounted to oil expeller 1 by spud pile, prevent each
Bar cable is mutually wound, while can also reduce impact of the liquid in oil expeller 1 to cable, extends anode cable 5, cathode electricity
The service life of cable 6 and reference cable 7.
Impressed current cathode protection device for oil expeller of the invention further includes explosion-proof wiring box 9, potentiostat 31
Each terminals pass through explosion-proof wiring box 9 and be connected with the inside of oil expeller 1 or ground.Explosion-proof wiring box 9 is by various anti-
Quick-fried transformation and the manufactured junction box with explosion prevention function, due in oil expeller 1 with mixed oil, liquid water and gas, and work
Temperature is higher when making, and explosion-proof wiring box 9 can guarantee the safe operation of oil expeller 1.
During actual practice, impressed current cathode protection device is used in system in Tahe Oilfield sewage treatment
In the oil expeller of system, corrosion monitoring lacing film corrosion rate is 0.0310mm/a, and remain unchanged operational excellence, oil removing after the long period
Corrosion failure phenomenon does not occur for device.And it is using the average corrosion rate of the oil expeller of galvanic anode protection technology before
0.7952mm/a, operation were not just available because metal cavity wall is corroded less than 2 years.It can thus be seen that using electricity is forced
Stream cathode protection device can more efficiently prevent from oil expeller and be corroded, and extend the service life of oil expeller.
In this application unless specifically defined or limited otherwise, the terms such as " connected ", " connection " shall be understood in a broad sense,
For example, it may be being fixedly connected, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to be electrically connected
It connects；It can be directly connected, the connection or two members inside two elements can also be can be indirectly connected through an intermediary
The interaction relationship of part.For the ordinary skill in the art, it can understand that above-mentioned term exists as the case may be
Concrete meaning in the present invention.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited to texts
Disclosed in specific embodiment, but include all technical solutions falling within the scope of the claims.
Claims (7)
1. a kind of impressed current cathode protection device for oil expeller characterized by comprising
Impressed current anode is arranged in the inner cavity of the oil expeller, and can be in contact with the liquid in the inner cavity；
DC power supply, anode is connected with the impressed current anode, and the metal cavity wall phase of its cathode and the inner cavity of the oil expeller
It is connected even or with the perishable metal component of oil expeller inner cavity；
Under the action of the DC power supply, the metal cavity wall of the inner cavity of the oil expeller or the oil expeller inner cavity it is perishable
Reduction reaction occurs for metal component, and oxidation reaction occurs for the impressed current anode；
The protection potential of the metal cavity wall of the inner cavity of the oil expeller be -1.5~-0.85V, protecting current density be 20~
50mA/m2；
The shape of the impressed current anode is tubulose, and the impressed current anode is arranged along the flowing of liquid in the oil expeller
Direction extends.
2. impressed current cathode protection device according to claim 1, which is characterized in that the DC power supply includes permanent electricity
Position instrument, it is intracavitary equipped with the reference electrode that can be in contact with the liquid in the inner cavity, the constant potential in the oil expeller
The reference terminals of instrument are connected with the reference electrode, and the zero-bit terminals of the potentiostat are connected with ground.
3. impressed current cathode protection device according to claim 1, which is characterized in that the material of the impressed current anode is
Magnesium alloy.
4. impressed current cathode protection device according to claim 3, which is characterized in that the quantity of the impressed current anode is
It is multiple.
5. impressed current cathode protection device according to claim 2, which is characterized in that the material of the reference electrode is
Ag or AgCl.
6. impressed current cathode protection device according to claim 2, which is characterized in that further include connecting the constant potential
The positive terminal of instrument and the anode cable of the impressed current anode, the negative terminals and the oil removing for connecting the potentiostat
Cathode cable, the reference terminals of the connection potentiostat and the reference of the reference electrode of the metal cavity wall of the inner cavity of device
The zero-bit cable of the zero-bit terminals and ground of cable and the connection potentiostat；The inside of the oil expeller is equipped with fixed institute
State the cable spud pile of anode cable, cathode cable and reference cable.
7. impressed current cathode protection device according to claim 6, which is characterized in that it further include explosion-proof wiring box, institute
Each terminals for stating potentiostat pass through the explosion-proof wiring box and are connected with the inside of the oil expeller or ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710483330.4A CN107236960B (en) | 2017-06-22 | 2017-06-22 | A kind of impressed current cathode protection device for oil expeller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710483330.4A CN107236960B (en) | 2017-06-22 | 2017-06-22 | A kind of impressed current cathode protection device for oil expeller |
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| CN107236960A CN107236960A (en) | 2017-10-10 |
| CN107236960B true CN107236960B (en) | 2019-11-01 |
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| CN108396316B (en) * | 2018-02-11 | 2020-07-07 | 吉林省电力科学研究院有限公司 | Metal passivation process combining oxygenation and cathodic protection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100581A (en) * | 1986-05-21 | 1987-12-02 | 华东输油管理局 | Overhead metallic pipe cathode protector |
| CN203960334U (en) * | 2014-06-17 | 2014-11-26 | 北京碧海舟腐蚀防护工业股份有限公司 | For the cathodic protection system of buried pipeline |
| CN104532263A (en) * | 2015-01-09 | 2015-04-22 | 西安石油大学 | Oil casing pipe cathode protecting system based on pulse current power supply and building method thereof |
| CN105331983A (en) * | 2015-10-14 | 2016-02-17 | 珠海格力电器股份有限公司 | Control system and control method for forced current cathodic protection |
-
2017
- 2017-06-22 CN CN201710483330.4A patent/CN107236960B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100581A (en) * | 1986-05-21 | 1987-12-02 | 华东输油管理局 | Overhead metallic pipe cathode protector |
| CN203960334U (en) * | 2014-06-17 | 2014-11-26 | 北京碧海舟腐蚀防护工业股份有限公司 | For the cathodic protection system of buried pipeline |
| CN104532263A (en) * | 2015-01-09 | 2015-04-22 | 西安石油大学 | Oil casing pipe cathode protecting system based on pulse current power supply and building method thereof |
| CN105331983A (en) * | 2015-10-14 | 2016-02-17 | 珠海格力电器股份有限公司 | Control system and control method for forced current cathodic protection |
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