CN202047760U - Cathode protector of sucker rod - Google Patents
Cathode protector of sucker rod Download PDFInfo
- Publication number
- CN202047760U CN202047760U CN2011200314918U CN201120031491U CN202047760U CN 202047760 U CN202047760 U CN 202047760U CN 2011200314918 U CN2011200314918 U CN 2011200314918U CN 201120031491 U CN201120031491 U CN 201120031491U CN 202047760 U CN202047760 U CN 202047760U
- Authority
- CN
- China
- Prior art keywords
- rod
- sucker rod
- stainless steel
- box cupling
- steel sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Prevention Of Electric Corrosion (AREA)
Abstract
The utility model discloses a cathode protector of a sucker rod in the field of oil extraction devices. The cathode protector comprises a rod body and collars arranged at both ends of the rod body. The periphery of the rod body is provided with an alloy sleeve made of a metal which is livelier than a steel material, a stainless steel sleeve is sleeved outside the alloy sleeve, centering devices sleeved outside the rod body are arranged among the alloy sleeve, the stainless steel sleeve and the collars, and a plurality of through holes are arranged on the outer wall of the stainless steel sleeve. When the cathode protector of the sucker rod is applied in an oil-water well, protective potential difference can be formed so that electrochemical corrosion can be prevented and lightened, electrochemical corrosion rate of the sucker rod or the collars is slowed, and the service life of the sucker rod or the collars is prolonged.
Description
Technical field
The utility model belongs to the oil production equipment field, particularly a kind of sucker rod.
Background technology
Sucker rod is one of vitals of oil exploitation sucker rod pumping, it pumps in the underground oil-water medium for a long time, sucker rod or box cupling will produce friction with oil pipe, cause the damage by friction of sucker rod or box cupling and oil pipe, especially more outstanding in directional well, high angle hole, horizontal well.In addition, along with oil field development enters the middle and later periods, extraction liquid in the oil well production and injection formation water salinity are higher, strong electrolytes such as the sulfide that contains, carbon dioxide, oxygen, sulfate reducing bacteria, material such as sucker rod or box cupling and oil pipe all is not quite similar, electrode potential in electrolyte is also different, and this just forms the galvanic cell reaction at sucker rod or coupling surface, and sucker rod or box cupling lose electronics and electrochemical corrosion takes place as anode.The residing media environment of sucker rod or box cupling has determined it to be corroded the order of severity of injury, because the residing abominable media environment of rod-pumped well, " high temperature, high salinity, high moisture " all plays the catalysed promoted effect to corrosion reaction speed, the chloride ion content height, provide sucker rod or box cupling to form the condition and the chance of pitting corrosion, accelerate electrochemical corrosion speed, caused sucker rod or coupling corrosion to lose efficacy at last.
Sucker rod plays a part very important in the crude oil production process of sucker rod pump, and in a single day sucker rod goes wrong, and the ordinary production of oil well can't be carried out, thereby causes oil well to stop production, and workover treatment brings massive losses to the oil field.
At the etching problem of sucker rod or box cupling, domestic method commonly used mainly is to add corrosion inhibiter in oil well, though can slow down corrosion to a certain extent, on-the-spot difficulty is big, and workload is big, and poor to the big well anticorrosion ability of eccentric wear well and sleeve pipe gas.
The utility model content
The purpose of this utility model is in order to overcome above-mentioned deficiency, a kind of sucker rod cathodic protector to be provided, to solve the electrochemical corrosion problem of sucker rod or box cupling.
The utility model is achieved by the following technical solution: a kind of sucker rod cathodic protector; comprise the box cupling that the body of rod and body of rod two ends are provided with; described body of rod periphery is provided with the metal alloy cover more more active than steel material; the outer stainless steel sleeve that is set with of alloy cover; be provided with the centralizer that is nested with outside the body of rod between described alloy cover, stainless steel sleeve and the box cupling, the outer wall of described stainless steel sleeve is provided with some through holes.
During work; the utility model is lowered in the oil well; in the electrolyte solution of pit shaft; the alloy cover is as anode; sucker rod or box cupling are as negative electrode, and anode constantly provides cathode current to protected sucker rod or box cupling, and the body of rod or box cupling are carried out cathodic polarization; the corrosion cell effect of the body of rod or box cupling is forced to stop, and has fundamentally resisted the electrochemical corrosion of the body of rod or box cupling.Along with constantly flowing of electric current, anode material constantly is consumed, and becomes powder or is dissolved in the liquid, discharges well head with liquid again.Electrochemical corrosion just can take place in the body of rod or box cupling after sacrificial anode runs out of, and the time limit of oil-water well sacrificial anode consumption is exactly the time limit that prolongs in the oil pipe life-span.Compared with prior art; the beneficial effect that is of the present utility model is: can form the protectiveness potential difference when using in oil-water well; prevent and alleviate electrochemical corrosion, slow down the electrochemical corrosion speed of sucker rod or box cupling, prolong the application life of sucker rod or box cupling.
For guaranteeing that stainless steel sleeve can the shift position, described stainless steel sleeve two ends are embedded in the centralizer.
For guaranteeing that the alloy cover can be by secure fixation, the equal in length of described stainless steel sleeve and alloy cover.
Fall in the pit shaft for the bulk alloy material that the alloy cover that prevents to be corroded produces, the holddown accident takes place, the diameter of described through hole is not more than 6mm.
The material of described alloy cover can be one of metal alloy that contains aluminium, zinc, magnesium, chromium.
Description of drawings
Fig. 1 is the utility model sucker rod cathodic protector structural representation.
Among the figure, 1 box cupling, 2 centralizers, 3 bodies of rod, 4 alloy covers, 5 stainless steel sleeves, 501 through holes
The specific embodiment
As shown in Figure 1, be a kind of sucker rod cathodic protector, comprise the box cupling 1 that the body of rod 3 and body of rod two ends are provided with, the body of rod 3 and box cupling 1 are made by steel material, the body of rod 3 peripheries are provided with the metal alloy cover 4 more more active than steel material, the alloy cover 4 outer stainless steel sleeves 5 that are set with, 1 of alloy cover 4, stainless steel sleeve 5 and box cupling is provided with the centralizer 2 that is nested with outside the body of rod 3, centralizer 2 is made by nylon or other macromolecular material, the outer wall of stainless steel sleeve 5 is provided with some through holes 501, and the diameter of through hole 501 is not more than 6mm; The equal in length of stainless steel sleeve 5 and alloy cover 4; Stainless steel sleeve 5 two ends are embedded in the centralizer 2; The material of described alloy cover 4 can be one of metal alloy that contains aluminium, zinc, magnesium, chromium.
This device is connected with rod string and is lowered into simultaneously in the oil well; in the electrolyte solution of pit shaft; alloy cover 4 is as anode; the body of rod 3 or box cupling 1 are as negative electrode; anode constantly provides cathode current to the protected body of rod or box cupling; the body of rod 3 or box cupling 1 are carried out cathodic polarization, and the corrosion cell effect of the body of rod 3 and box cupling 1 is forced to stop, and has fundamentally resisted the electrochemical corrosion of the body of rod and box cupling.Along with constantly flowing of electric current, anode material constantly is consumed, and becomes powder or is dissolved in the liquid, discharges well head with liquid then.Electrochemical corrosion just can take place in sucker rod or box cupling after sacrificial anode runs out of, and the time limit of oil-water well sacrificial anode consumption is exactly the time limit that prolongs in the oil pipe life-span.
In the serious oil well of electrochemistry, according to the extent of corrosion difference of oil well, during operation the sucker rod cathodic protector is connected according to the certain intervals ratio with sucker rod, with getting final product in the sucker rod lower going-into-well, can play anti-preferably electrochemical corrosion effect.
Claims (4)
1. sucker rod cathodic protector; comprise the box cupling that the body of rod and body of rod two ends are provided with; it is characterized in that: described body of rod periphery is provided with the metal alloy cover more more active than steel material; the outer stainless steel sleeve that is set with of alloy cover; be provided with the centralizer that is nested with outside the body of rod between described alloy cover, stainless steel sleeve and the box cupling, the outer wall of described stainless steel sleeve is provided with some through holes.
2. sucker rod cathodic protector according to claim 1 is characterized in that: described stainless steel sleeve two ends are embedded in the centralizer.
3. sucker rod cathodic protector according to claim 1 and 2 is characterized in that: the equal in length of described stainless steel sleeve and alloy cover.
4. sucker rod cathodic protector according to claim 1 and 2 is characterized in that: the diameter of described through hole is not more than 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200314918U CN202047760U (en) | 2011-01-28 | 2011-01-28 | Cathode protector of sucker rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200314918U CN202047760U (en) | 2011-01-28 | 2011-01-28 | Cathode protector of sucker rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202047760U true CN202047760U (en) | 2011-11-23 |
Family
ID=44988071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200314918U Expired - Lifetime CN202047760U (en) | 2011-01-28 | 2011-01-28 | Cathode protector of sucker rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202047760U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328441A (en) * | 2014-10-27 | 2015-02-04 | 西安石油大学 | Non-metal conducting oil-well anti-eccentric-wear anticorrosive device and manufacturing method thereof |
| CN112096305A (en) * | 2020-11-05 | 2020-12-18 | 东营市三和石油装备有限公司 | Stainless steel solid sucker rod wrapped with stainless steel and preparation method thereof |
| CN114134507A (en) * | 2021-11-29 | 2022-03-04 | 牡丹江市新翔石油机械有限责任公司 | Magnesium alloy, sacrificial anode device and oil casing pipe potential corrosion prevention device thereof |
-
2011
- 2011-01-28 CN CN2011200314918U patent/CN202047760U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328441A (en) * | 2014-10-27 | 2015-02-04 | 西安石油大学 | Non-metal conducting oil-well anti-eccentric-wear anticorrosive device and manufacturing method thereof |
| CN104328441B (en) * | 2014-10-27 | 2017-03-15 | 西安石油大学 | A kind of radio frequency type eccentric wear prevention of oil well corrosion-preventing device and preparation method thereof |
| CN112096305A (en) * | 2020-11-05 | 2020-12-18 | 东营市三和石油装备有限公司 | Stainless steel solid sucker rod wrapped with stainless steel and preparation method thereof |
| CN114134507A (en) * | 2021-11-29 | 2022-03-04 | 牡丹江市新翔石油机械有限责任公司 | Magnesium alloy, sacrificial anode device and oil casing pipe potential corrosion prevention device thereof |
| CN114134507B (en) * | 2021-11-29 | 2022-08-02 | 牡丹江市新翔石油机械有限责任公司 | Magnesium alloy, sacrificial anode device and oil casing pipe potential corrosion prevention device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111123 |