CN104498962A - Forced current cathode protection method of inner wall of oilfield sewage storage tank - Google Patents
Forced current cathode protection method of inner wall of oilfield sewage storage tank Download PDFInfo
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- CN104498962A CN104498962A CN201410692948.8A CN201410692948A CN104498962A CN 104498962 A CN104498962 A CN 104498962A CN 201410692948 A CN201410692948 A CN 201410692948A CN 104498962 A CN104498962 A CN 104498962A
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Abstract
The invention discloses a forced current cathode protection method of the inner wall of an oilfield sewage storage tank, and belongs to the technical field of anticorrosion of oilfield storage tanks. An apparatus for realizing the method comprises a stabilized current supply controller, an MMO tubular anode string, a support steel cable, a reference electrode and a wiring test box; the support steel cable is arranged in a storage tank, one end of the support steel cable is fixed to the top of the tank, and the other end is fixed to the bottom of the tank; the MMO tubular anode string is fixedly arranged on the support steel cable in a suspension manner; an anode cable connected with the MMO tubular anode cable traverses through the opening of the top of the tank and is connected to the wiring test box; a reference cable connected with the reference electrode traverses through the opening of the top of the tank and is connected to the wiring test box; the wiring test box is connected to the stabilized current supply controller; and a cathode cable and a cathodic protection station cable which are welded to the edges of the baseboard of the tank are respectively connected to the stabilized current supply controller. The method has the advantages of uniform protection potential, adjustable output current, long anode life, protruding anticorrosion effect, flexible anode installation mode and fast installation speed.
Description
Technical field
The present invention relates to lease tank technical field of anticorrosion, particularly a kind of oilfield sewage reservoir walls impressed current cathode protecting process, can be used for the anticorrosion of large oilfield new and old sewage storage tank inwall.
Background technology
The protection against corrosion of oilfield sewage reservoir walls mostly adopts the method for applying coating.But in practice of construction, inevitably SOL, causes the generation of local corrosion.The principal character of this corrosion is pitting, and pitting continues expansion and then forms ulcer corrosion.For overcoming the generation of reservoir walls pitting, coating can be adopted to power up chemoprotectant method.At present, domestic application is the protection method that coating adds sacrificial anode comparatively widely.But, still there is certain problem, be mainly manifested in the applicable cases of sacrificial anode in current domestic sewage storage tank: 1) under the corrosive medium and hot environment of this harshness of sewage, and the consumption of sacrificial anode self is also very large; 2) in sewage storage tank, owing to there is the deposition of a lot of solid impurity, and the installation site of sacrificial anode is lower, and the impurity therefore deposited likely covers sacrificial anode, the electric current affecting sacrificial anode exports, thus constrains the protected effect of sacrificial anode; 3) what sewage storage tank will be protected is whole inwall; protected area is larger; and be all dynamic operation in storage tank; ceaselessly there is flowing to and flowing out of medium; through operation for many years; corrosion protection coating ordinary breakage in storage tank is all relatively more serious, and electric current required is like this also just very large, causes sacrificial anode to be not enough to provide size of current required in storage tank when the later stage is run.
Summary of the invention
In order to solve existing oilfield sewage reservoir walls coating power up method of chemical protection exist sacrificial anode consumption large, electric current exports the problems such as the limited corrosion protection coating badly broken caused, the invention provides a kind of oilfield sewage reservoir walls impressed current cathode protecting process, comprise stabilized current supply controller, MMO sheath string, supporting steel hawser, reference electrode and wiring test box, described supporting steel hawser is arranged in sewage storage tank, described supporting steel hawser one end is fixed on sewage storage tank tank deck, the described supporting steel hawser the other end is fixed on the concrete seating load block at the bottom of sewage storage tank tank, described MMO sheath string adopts hang to be fixedly mounted on described supporting steel hawser, the anode cable connecting described MMO sheath string is connected to described wiring test box through sewage storage tank tank deck tapping, the reference cable connecting described reference electrode is connected to described wiring test box through sewage storage tank tank deck tapping, described wiring test box is connected to described stabilized current supply controller, the cathode cable and the cathodic protection station cable that are welded on sewage storage tank tank bottom edge are connected to described stabilized current supply controller respectively.
Described stabilized current supply controller has four connection terminals, comprises supplementary anode terminal, reference electrode terminal, cathode terminal and zero-bit terminal; Described wiring test box is connected respectively with supplementary anode terminal, reference electrode terminal; Described cathode cable is connected with described cathode terminal, and described cathodic protection station cable is connected with zero-bit terminal.
Described MMO sheath string to be connected in series by water-proof cable by multiple anode and to form, and described water-proof cable is fixed by clip and described supporting steel hawser; Described MMO sheath string is evenly distributed in central position in sewage storage tank, and insulate with hardware in sewage storage tank and separate.
The quantity of described reference electrode is multiple; A reference electrode is arranged at sewage storage tank tank bottom and tank skin intersection, for feedback signal; Other reference electrodes are for monitoring current potential; The vertical range of each reference electrode and sewage storage tank inwall is no more than 5cm.
Oilfield sewage reservoir walls impressed current cathode protecting process provided by the invention, can reduce the corrosion failure phenomenon that oilfield sewage reservoir walls produces because of holiday effectively.In the oilfield sewage reservoir walls of high temperature, strong corrosive environment; sewage storage tank inwall impressed current cathodic protection method has that protection potential is even, outward current is adjustable, anode life is long, preservative effect is outstanding, anode mounting means is flexible and the advantage such as installation rate is fast; can be widely applied in the design of newly-built large oilfield sewage storage tank; old Water Tank also can increase this conservation project when stop production to overhaul simultaneously; make storage tank safe operation, to obtain best economic technology benefit.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention oilfield sewage reservoir walls impressed current cathode protecting process principle schematic;
Fig. 2 is the circuit connection diagram of embodiment of the present invention wiring test box and stabilized current supply controller.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
See Fig. 1 and Fig. 2; embodiments provide a kind of oilfield sewage reservoir walls impressed current cathode protecting process; comprise stabilized current supply controller 8, MMO (Mixed Metal Oxide, mixed metal oxide) sheath string 2, supporting steel hawser 3, reference electrode 6 and wiring test box 7.Wherein, supporting steel hawser 3 is arranged in sewage storage tank 1, and one end of supporting steel hawser 3 is fixed on sewage storage tank tank deck, and the other end of supporting steel hawser 3 is fixed on the concrete seating load block 4 at the bottom of sewage storage tank tank; MMO sheath string 2 adopts hang to be fixedly mounted on supporting steel hawser 3, is formed " rope form anodic column string "; The anode cable 21 connecting MMO sheath string 2 is connected to the other wiring test box 7 of storage tank 1 through sewage storage tank 1 tank deck tapping; The reference cable 61 connecting reference electrode 6 is connected to wiring test box 7 through sewage storage tank 1 tank deck tapping; Wiring test box 7 gathers cable 71 by anode and control reference cable 72 is connected to stabilized current supply controller 8; The cathode cable 9 and the cathodic protection station cable 10 that are welded on sewage storage tank 1 tank bottom edge are connected to stabilized current supply controller 8 respectively.
As shown in Figure 2, anode cable 21 draws respectively receives anode, and in wiring test box 7, be aggregated into a total anode cable, then gathers cable 71 by anode and be connected to stabilized current supply controller 8; Reference cable 61 draws respectively receives RE, and the reference (also claiming to control reference) being wherein used for feedback signal is connected to stabilized current supply controller 8 by controlling reference cable 72.In the present embodiment, the quantity of reference electrode 6 is 6, wherein: 1 reference electrode is arranged at sewage storage tank 1 tank bottom and tank skin intersection, for feedback signal; Other 5 reference electrodes are for monitoring current potential; The vertical range of each reference electrode and sewage storage tank inwall is no more than 5cm.In actual applications, the quantity of reference electrode can require to select according to the current measurement of current cathodic protection.
As shown in Figure 2, stabilized current supply controller 8 has four connection terminals, comprises supplementary anode terminal, reference electrode terminal, cathode terminal and zero-bit terminal; Wiring test box 7 gathers cable 71 by anode and is connected with supplementary anode terminal, wiring test box 7 is connected with reference electrode terminal by controlling reference cable 72, make the electrical signal of anode cable and reference cable introduce stabilized current supply controller, and then realize the control to electric current; Cathode cable is connected with cathode terminal, and cathodic protection station cable is connected with zero-bit terminal.In the present embodiment, stabilized current supply controller 8 can adopt the refined conjunction in Qingdao IHF-30A/40V.
As shown in Figure 1, MMO sheath string 2 to be connected in series by water-proof cable by multiple anode and to form, and cable is fixed by clip 5 every 0.5m ~ 1m and storage tank inner support steel cable 3; MMO sheath string 2 is evenly distributed in the central position in sewage storage tank 1, and insulate with the hardware in sewage storage tank 1 and separate.
The oilfield sewage reservoir walls impressed current cathode protecting process that the embodiment of the present invention provides; its principle is that the electric current utilizing anode to disperse is transmitted to reservoir walls through wastewater media; control by stabilized current supply controller the reference size being used for feedback signal, thus make inwall polarized potential automatically reach the requirement of protection potential.
The oilfield sewage reservoir walls impressed current cathode protecting process that the embodiment of the present invention provides, can reduce the corrosion failure phenomenon that oilfield sewage reservoir walls produces because of holiday effectively.In the oilfield sewage reservoir walls of high temperature, strong corrosive environment; sewage storage tank inwall impressed current cathodic protection method has that protection potential is even, outward current is adjustable, anode life is long, preservative effect is outstanding, anode mounting means is flexible and the advantage such as installation rate is fast; can be widely applied in the design of newly-built large oilfield sewage storage tank; old Water Tank also can increase this conservation project when stop production to overhaul simultaneously; make storage tank safe operation, to obtain best economic technology benefit.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. an oilfield sewage reservoir walls impressed current cathode protecting process, comprise stabilized current supply controller, MMO sheath string, supporting steel hawser, reference electrode and wiring test box, it is characterized in that, described supporting steel hawser is arranged in sewage storage tank, described supporting steel hawser one end is fixed on sewage storage tank tank deck, and the described supporting steel hawser the other end is fixed on the concrete seating load block at the bottom of sewage storage tank tank; Described MMO sheath string adopts hang to be fixedly mounted on described supporting steel hawser; The anode cable connecting described MMO sheath string is connected to described wiring test box through sewage storage tank tank deck tapping; The reference cable connecting described reference electrode is connected to described wiring test box through sewage storage tank tank deck tapping; Described wiring test box is connected to described stabilized current supply controller; The cathode cable and the cathodic protection station cable that are welded on sewage storage tank tank bottom edge are connected to described stabilized current supply controller respectively.
2. oilfield sewage reservoir walls impressed current cathode protecting process according to claim 1, it is characterized in that, described stabilized current supply controller has four connection terminals, comprises supplementary anode terminal, reference electrode terminal, cathode terminal and zero-bit terminal; Described wiring test box is connected respectively with supplementary anode terminal, reference electrode terminal; Described cathode cable is connected with described cathode terminal, and described cathodic protection station cable is connected with zero-bit terminal.
3. oilfield sewage reservoir walls impressed current cathode protecting process according to claim 1 and 2, it is characterized in that, described MMO sheath string to be connected in series by water-proof cable by multiple anode and to form, and described water-proof cable is fixed by clip and described supporting steel hawser; Described MMO sheath string is evenly distributed in central position in sewage storage tank, and insulate with hardware in sewage storage tank and separate.
4. oilfield sewage reservoir walls impressed current cathode protecting process according to claim 1 and 2, is characterized in that, the quantity of described reference electrode is multiple; A reference electrode is arranged at sewage storage tank tank bottom and tank skin intersection, for feedback signal; Other reference electrodes are for monitoring current potential; The vertical range of each reference electrode and sewage storage tank inwall is no more than 5cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692948.8A CN104498962A (en) | 2014-11-26 | 2014-11-26 | Forced current cathode protection method of inner wall of oilfield sewage storage tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410692948.8A CN104498962A (en) | 2014-11-26 | 2014-11-26 | Forced current cathode protection method of inner wall of oilfield sewage storage tank |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911604A (en) * | 2015-06-11 | 2015-09-16 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Oil-field water injection pipeline inner wall anticorrosion device and replacement method |
| CN105925988A (en) * | 2016-07-06 | 2016-09-07 | 天津隆顺技术服务有限公司 | Corrosion-prevention protection device for tank bottom of storage tank and storage tank |
| CN106148967A (en) * | 2016-07-06 | 2016-11-23 | 舟山汉旗新材料有限公司 | A kind of antisepsis protector of floating roof petroleum storage tank |
| CN109082669A (en) * | 2018-09-29 | 2018-12-25 | 中国石油天然气集团公司 | A kind of mounting device of inner tank surface impressed current cathodic protection facility |
| CN109680281A (en) * | 2019-02-28 | 2019-04-26 | 西安石油大学 | A kind of pipeline internal corrosion cathodic protection system and method based on pulse current power supply |
| CN109881203A (en) * | 2019-03-27 | 2019-06-14 | 中国石油工程建设有限公司北京设计分公司 | A kind of closed tank cathodic protection potential monitoring device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911604A (en) * | 2015-06-11 | 2015-09-16 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Oil-field water injection pipeline inner wall anticorrosion device and replacement method |
| CN104911604B (en) * | 2015-06-11 | 2017-07-25 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of Oilfield Water Injection Pipelines inner wall anti-corrosive device and replacing options |
| CN105925988A (en) * | 2016-07-06 | 2016-09-07 | 天津隆顺技术服务有限公司 | Corrosion-prevention protection device for tank bottom of storage tank and storage tank |
| CN106148967A (en) * | 2016-07-06 | 2016-11-23 | 舟山汉旗新材料有限公司 | A kind of antisepsis protector of floating roof petroleum storage tank |
| CN106148967B (en) * | 2016-07-06 | 2018-05-29 | 舟山汉旗新材料有限公司 | A kind of antisepsis protector of floating roof petroleum storage tank |
| CN109082669A (en) * | 2018-09-29 | 2018-12-25 | 中国石油天然气集团公司 | A kind of mounting device of inner tank surface impressed current cathodic protection facility |
| CN109680281A (en) * | 2019-02-28 | 2019-04-26 | 西安石油大学 | A kind of pipeline internal corrosion cathodic protection system and method based on pulse current power supply |
| CN109881203A (en) * | 2019-03-27 | 2019-06-14 | 中国石油工程建设有限公司北京设计分公司 | A kind of closed tank cathodic protection potential monitoring device |
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Application publication date: 20150408 |