CN202989282U - Anti-corrosion casing pipe - Google Patents
Anti-corrosion casing pipe Download PDFInfo
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- CN202989282U CN202989282U CN 201220470873 CN201220470873U CN202989282U CN 202989282 U CN202989282 U CN 202989282U CN 201220470873 CN201220470873 CN 201220470873 CN 201220470873 U CN201220470873 U CN 201220470873U CN 202989282 U CN202989282 U CN 202989282U
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- casing pipe
- bracelet
- casing
- corrosion
- anode
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Abstract
The utility model belongs to an anti-corrosion casing pipe. The technical scheme includes that the anti-corrosion casing pipe comprises an oil casing pipe, the outer wall of the casing pipe can tightly sleeved on bracelet anodes, and an electrode potential of each bracelet anode is lower than an electrode potential of the casing pipe. The bracelet anodes are distributed in any one place or places of three places, namely an upper place, a middle place and a lower place, of the oil casing pipe. A plurality of oil casing pipes are arranged in a well, four bracelet anodes are installed on the first casing pipe and the last casing pipe in each well, and one bracelet anode is installed on the middle anti-corrosion casing pipe. By adopting the technical scheme, the anti-corrosion casing pipe has the advantages that a return circuit battery is formed due to the fact that a theory of metal cathode protection is used, the casing pipe is placed in a cathode, and the bracelet anodes are placed in an anode, the casing pipe is protected when only the bracelet anodes are corroded, operation is simple and convenient, site construction is convenient, and effect is obvious.
Description
Technical field:
The utility model belongs to oil field casing tube anti-corrosive technical field, is specifically related to anticorrosive casing pipe.
Background technology:
The casing corrosion form is take the spot corrosion perforation as main, with the Large-Area-Uniform corrosion thinning.
Corrosion product accounts for 12～20%, Fe2O3 and accounts for 10% take FeCO3 as main 56～60%, the FeS that accounts for.Increase with well depth, FeCO3 content increases, and FeO2 content reduces.Corrosion is take the galvanic corrosion of CO2 as main, a small amount of H2S and O2.
At present sleeve pipe anticorrosion only has the use preservative coat, preservative coat, play isolation corrosive medium effect, preservative coat can not zero defect, is anode when the iron of revealing place is arranged, current potential is for negative, and coating complete place is negative electrode, has the unfavorable Area Ratio of the large negative electrode of primary anode, causes the primary anode corrosion electric current density very large, the less electric current of the defective of coating discharges more concentrated, and perforation rate can increase along with the raising of coating quality.More can destroy preservative coat in the process of going into the well, cause casing corrosion.
The utility model content:
Utility model purpose: for a kind of device that can effectively prevent casing corrosion is provided.
In order to reach as above purpose, the utility model is taked following technical scheme: comprise tubing and casing, sleeve outer wall closely entangles bracelet anode, the electropotential of bracelet anode is lower than the electrode electrode of sleeve pipe, described bracelet anode is distributed in any place or the many places in upper, middle and lower three places of tubing and casing, described tubing and casing has many in a bite well the inside, on first of every mouthful of well and last root sleeve pipe, four bracelet anodes is installed, and a bracelet anode is installed on middle anticorrosive casing pipe.
Adopt as above the utility model of technical scheme, have following beneficial effect: utilize the principle of metallic cathode protection, make sleeve pipe be in negative electrode, bracelet anode is in anode, forms like this a loop battery, only corrodes bracelet anode, and sleeve pipe is in protection.And implementation method is simple to operate, and site operation is convenient, successful.
Description of drawings:
In order to further illustrate the utility model, further describe below in conjunction with accompanying drawing:
Fig. 1 is the structural representation of utility model;
Fig. 2 is anticorrosive casing pipe quantity and down-hole string schematic diagram under individual well;
Fig. 3 is rig-site utilization Casing Failure protection polarization curve;
Wherein: 1. bracelet anode; 2. tubing and casing;
Embodiment:
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, embodiment does not consist of restriction of the present utility model:
Comprise tubing and casing 2, sleeve outer wall closely entangles bracelet anode 1, and the electropotential of bracelet anode 1 is lower than the electrode electrode of sleeve pipe.
The further technical scheme of the utility model is: described bracelet anode 1 is distributed in any place or the many places in upper, middle and lower three places of tubing and casing 2.
The further technical scheme of the utility model is: described tubing and casing 2 has many in a bite well the inside, on first of every mouthful of well and last root sleeve pipe, four bracelet anodes is installed, and a bracelet anode is installed on middle anticorrosive casing pipe.
Working method
1, casing tube anti-corrosive is processed
(1) derusting by sandblast before casing tube anti-corrosive, reach the Sa2.5 level.
(2) casing tube anti-corrosive layer construction adopted spraying or brushes, bottom 1～2 time, and surface layer 1-2 time, the corrosion protection coating total thickness is greater than 150 μ m.
(3) coatingsurface is level and smooth, and insulation voltage reaches more than 1.5 ten thousand volts.
2, bracelet anode down-hole mounting design
According to downhole corrosion situation and drilling cost, require design to use anodize sleeve pipe 200-400 rice.
On first of every mouthful of well and last root sleeve pipe, four bracelet anodes are installed, a bracelet anode is installed on middle anticorrosive casing pipe.
3, construction technical requirement
(1) conscientious drifting: the drifting reaming guarantees that well is unimpeded, wellbore stability.
(2) control lowering velocity: evenly transfer, forbid suddenly to put suddenly to carry.
In conjunction with Fig. 2 and Fig. 3;
Be to detect Casing Failure protection effect, at the other about 6 meters detection wells that bore dark 100 meters of a bites of oil and water well, be lowered to different depths in testing well testing reference electrode with cable.Record the polarized potential of different well depths places sleeve pipe.
Find out from curve, the above earth potential of sleeve pipe has just reached-0.85v at the well head place, reaches maximum-0.909v at the 40m place, and in 100m all-more than 0.85v.The working potential of anode has all reached-0.938v at well head 5m and 100m place, down-hole, reach maximum-1.034v at the 40m place, and in 100m all-more than 0.930v, surpassed-protecting standard of 0.85v.The anode open circuit potential has reached maximum-1.387v at the 45m place, and in 100m all-more than 1.315v, the potential curve smoother, illustrate that the distribution of current potential is more even simultaneously.
The actual corrosion rate contrast of buried standard test piece test
Corrosion coupon is buried underground in pairs, its spacing 300mm.A slice is connected with sleeve pipe and applies anodic protection, and another sheet is not connected and is in the soil natural etch state.The test piece material is identical with sleeve pipe, and weighing precision is 1/100 gram.
Underground corrosion test piece test result
The relatively negative metallic substance of current potential provides a cathodic current by the ionogen in soil to sleeve pipe, and sleeve pipe is accepted electric current and polarized as negative electrode, its surface potential is born moved to the Thermodynamically stable equilibrium potential, thereby make the corrosion of sleeve pipe reduce or stop.
Above demonstration and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and specification sheets just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. anticorrosive casing pipe, it is characterized in that: comprise tubing and casing (2), sleeve outer wall closely entangles bracelet anode (1), the electropotential of bracelet anode (1) is lower than the electrode electrode of sleeve pipe, described bracelet anode (1) is distributed in any place or the many places in upper, middle and lower three places of tubing and casing (2), state tubing and casing (2) and have many inside a bite well, on first of every mouthful of well and last root sleeve pipe, four bracelet anodes are installed, a bracelet anode is installed on middle anticorrosive casing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470873 CN202989282U (en) | 2012-09-17 | 2012-09-17 | Anti-corrosion casing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470873 CN202989282U (en) | 2012-09-17 | 2012-09-17 | Anti-corrosion casing pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202989282U true CN202989282U (en) | 2013-06-12 |
Family
ID=48560478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220470873 Expired - Fee Related CN202989282U (en) | 2012-09-17 | 2012-09-17 | Anti-corrosion casing pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202989282U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265186A (en) * | 2014-08-13 | 2015-01-07 | 西安石油大学 | Cathode protection device for protecting inner walls of oil pipe and casing pipe and manufacturing method of cathode protection device |
| CN107575168A (en) * | 2017-08-24 | 2018-01-12 | 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 anticorrosive casing pipe and arrangement and application |
| CN109990142A (en) * | 2019-04-16 | 2019-07-09 | 广东华坤建设集团有限公司 | Pipe sleeve antiseep blocks up the research method of scheme in assembled arthitecutral structure |
| CN110938824A (en) * | 2018-09-21 | 2020-03-31 | 中国石油天然气股份有限公司 | Deep well anode device |
-
2012
- 2012-09-17 CN CN 201220470873 patent/CN202989282U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265186A (en) * | 2014-08-13 | 2015-01-07 | 西安石油大学 | Cathode protection device for protecting inner walls of oil pipe and casing pipe and manufacturing method of cathode protection device |
| CN107575168A (en) * | 2017-08-24 | 2018-01-12 | 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 anticorrosive casing pipe and arrangement and application |
| CN110938824A (en) * | 2018-09-21 | 2020-03-31 | 中国石油天然气股份有限公司 | Deep well anode device |
| CN110938824B (en) * | 2018-09-21 | 2021-11-02 | 中国石油天然气股份有限公司 | Deep well anode device |
| CN109990142A (en) * | 2019-04-16 | 2019-07-09 | 广东华坤建设集团有限公司 | Pipe sleeve antiseep blocks up the research method of scheme in assembled arthitecutral structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20160917 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |