CN201943605U - Zinc penetration oil sleeve coupling - Google Patents
Zinc penetration oil sleeve coupling Download PDFInfo
- Publication number
- CN201943605U CN201943605U CN2010207003578U CN201020700357U CN201943605U CN 201943605 U CN201943605 U CN 201943605U CN 2010207003578 U CN2010207003578 U CN 2010207003578U CN 201020700357 U CN201020700357 U CN 201020700357U CN 201943605 U CN201943605 U CN 201943605U
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- China
- Prior art keywords
- zinc
- box cupling
- layer
- tubing
- zincizing
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- Expired - Fee Related
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- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
The utility model discloses a zinc penetration oil sleeve coupling comprising a coupling body which is in a hollow tube shape; both ends of the coupling body are provided with an internal thread which extends to the middle part; and the outer surface of the coupling body and the surface of the internal thread are provided with zinc penetration layers. Each zinc penetration layer comprises a pure zinc layer, a zinc-rich layer and an iron-zinc alloy layer which are arranged from outside to inside; and the surface of the zinc penetration layer is also provided with a phosphating film layer. In the zinc penetration oil sleeve coupling, because the inner surface and the outer surface are provided with the compact zinc penetration layers with uniform thicknesses as protective layers, the deep layers are firmly and uniformly integrated with base metal, so that the wear resistance is good, the thread bonding resistance and corrosion resistance are high, and the anti-gluing and the anti-corrosion performance requirements of an oil sleeve can be met.
Description
Technical field
The utility model relates to oilfield production technique field, specifically, relates to a kind of zincizing tubing and casing box cupling that connects tubing and casing that is exclusively used in.
Background technology
Tubing and casing is to require the degree of depth machinery converted products high, that consumption is big in the petroleum engineering, tubing and casing is formed by connecting by oil pipe and box cupling, the oil pipe two ends have external screw thread, the box cupling two ends have internal thread, adopt box cupling that more than 10 meters long single tubing round thread closely is connected to become to reach thousands of rice, can suffer hundreds of atmospheric long strings-pipe and adorn high-pressure bottle, be lowered to and carry out oil producing operation in the oil well.Oil pipe go into the well or use in, need repeatedly loading and unloading during operation, thread up and dismantle screw thread (shackle on the abbreviation) repeatedly, owing to go up shackle repeatedly, tightening torque control is improper, can cause tubing material plastic strain to occur, tend to occur the phenomenon of screw thread " more and more pine ", the tired thread gluing of screw thread; , cause excessively going up button owing to cross moment of torsion, thereby produce " thread gluing " phenomenon when buckleing on box cupling is connected at oil pipe, often all can cause scrapping too early of oil pipe, bring the huge wasting of resources and inestimable loss to the user.
Cause the reason of above-mentioned " thread gluing " phenomenon to be: the general treatment process to tubing and casing is at present: tubing round thread is that machine forms, and does not carry out surfacing; Box cupling carries out phosphatization or zinc-plated processing after machining screw, adopt the screw thread of phosphatization or zinc-plated processing, and in the maritime environment of humidity, corrosion resistance is relatively poor, and zinc coat very easily is corroded, and produces screw thread thread gluing phenomenon in actual use.
The utility model content
Technical problem to be solved in the utility model is: a kind of zincizing tubing and casing box cupling with excellent corrosion resisting performance and anti-screw thread adhesive property is provided.
For solving the problems of the technologies described above, the technical solution of the utility model is: zincizing tubing and casing box cupling, the box cupling body that comprises hollow tube-shape, the two ends of described box cupling body are equipped with the internal thread that extends to the middle part, and the external surface and the interior threaded surface of described box cupling body are equipped with zinc coat.
As optimized technical scheme, described zinc coat comprises pure zinc layer from outside to inside, rich zinc layer and fe-zn alloy layer.
As optimized technical scheme, the thickness of described zinc coat is 0.03mm～0.06mm.
As optimized technical scheme, described zinc coat surface also is provided with phosphorization membrane.
Owing to adopted technique scheme; the beneficial effects of the utility model are: because described zincizing tubing and casing box cupling; the box cupling body that comprises hollow tube-shape; the two ends of described box cupling body are equipped with the internal thread that extends to the middle part; the external surface and the interior threaded surface of described box cupling body are equipped with zinc coat; compare with the zinc-plated tubing and casing box cupling of prior art; when the tubing and casing box cupling is carried out the zincizing processing; scattering and permeating effect by metallic atom; the zinc element infiltrates the steel surface of box cupling; formation thickness is even; fine and close zinc-iron alloy topping; its deep layer combines with parent metal firmly; evenly; anti-wear performance is good; anti-screw thread adhesive property and antiseptic property height can satisfy the anti-stick button of tubing and casing; the antiseptic property requirement.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structure cross-sectional schematic of the utility model embodiment;
Fig. 2 is the partial enlarged drawing at A place among Fig. 1;
Among the figure: 1-box cupling body; The 11-internal thread; The a1-fe-zn alloy layer; The rich zinc layer of a2-; The a3-pure zinc layer; The b-phosphorization membrane.
The specific embodiment
Shown in Fig. 1 and Fig. 2 were common, zincizing tubing and casing box cupling comprised the box cupling body 1 of hollow tube-shape, and the two ends of described box cupling body 1 are equipped with the internal thread 11 that extends to the middle part, and the surface of the external surface of described box cupling body 1 and internal thread 11 is equipped with zinc coat.Described zinc coat is to adopt the sherardise technology, zincizing agent and box cupling are placed Sherardizing furnace, be heated to about 400 ℃, the active zinc atom then permeates to box cupling from outward appearance to inner essence, meanwhile, iron atom spreads from inside to outside, and this just forms zinc-iron intermetallic compound, i.e. zinc coat on the top layer of box cupling.
In the present embodiment, described zinc coat comprises pure zinc layer a3 from outside to inside, rich zinc layer a2 and fe-zn alloy layer a1.
In the present embodiment, the thickness of described zinc coat is 0.03mm～0.06mm.
In the present embodiment, described zinc coat surface also is provided with phosphorization membrane b.Described phosphorization membrane b adopts the common formed phosphate conversion film of phosphorization treatment process.The purpose of phosphatization mainly is: provide protection to parent metal, prevent that to a certain extent metal is corroded; The preceding bottoming that is used to paint improves the adhesive power and the anti-corrosion capability of paint film layer, thereby further improves the anti-corrosion capability and the anti-screw thread cementitiousness of whole box cupling.
Test one: anti-stick button performance test
External diameter 88.9mm, wall thickness 6.45mm, grade of steel are that heavy wall tubing, the box cupling of N80Q adopts zinc-plated processing or zincizing to handle respectively, use standard thread fat, carry out make-and-break test:
Last shackle moment of torsion Nm: minimum 3250, best 4330, maximum 5420;
Test by maximum torque wrench moment,
Result of the test: zinc-plated box cupling slight thread gluing phenomenon just occurs during shackle on the 5th time, and the thread gluing phenomenon do not occur after the shackle 12 times on the zincizing box cupling.
Test two: salt spray test
Salt spray test is the environmental test that a kind of manual simulation's salt mist environment condition of mainly utilizing salt spray test equipment to be created is examined product or metal material decay resistance.
Solution: sodium chloride is dissolved in the deionized water that electrical conductivity is no more than 20Ms/cm, and concentration is 50g/L ± 5g/L; Adjusting the pH value is 7.0,35 ℃ of test temperatures;
Spraying collector: 1mL/80cm
2/ h
Result of the test: through after 250 hours salt spray tests, sample " protection " grade can reach more than 7 grades.
Experimental results show that: zincizing tubing and casing box cupling of the present utility model is because surfaces externally and internally is equipped with even, the fine and close zinc coat of thickness as topping; compare with zinc coat; its deep layer combines with parent metal firmly, evenly; anti-wear performance is good; anti-screw thread adhesive property and antiseptic property height can satisfy the anti-stick button of tubing and casing, antiseptic property requirement.
The foregoing description only is giving an example of the utility model specific embodiment; protection domain of the present utility model is as the criterion with the content of claim; any equivalent transformation that carries out based on technology enlightenment of the present utility model is also within protection domain of the present utility model.
Claims (4)
1. zincizing tubing and casing box cupling comprises that the box cupling body of hollow tube-shape, the two ends of described box cupling body are equipped with the internal thread that extends to the middle part, and it is characterized in that: the external surface and the interior threaded surface of described box cupling body are equipped with zinc coat.
2. zincizing tubing and casing box cupling as claimed in claim 1 is characterized in that: described zinc coat comprises pure zinc layer from outside to inside, rich zinc layer and fe-zn alloy layer.
3. zincizing tubing and casing box cupling as claimed in claim 1 is characterized in that: the thickness of described zinc coat is 0.03mm～0.06mm.
4. as claim 1,2 or 3 described zincizing tubing and casing box cuplings, it is characterized in that: described zinc coat surface also is provided with phosphorization membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010207003578U CN201943605U (en) | 2010-12-31 | 2010-12-31 | Zinc penetration oil sleeve coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010207003578U CN201943605U (en) | 2010-12-31 | 2010-12-31 | Zinc penetration oil sleeve coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201943605U true CN201943605U (en) | 2011-08-24 |
Family
ID=44470954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010207003578U Expired - Fee Related CN201943605U (en) | 2010-12-31 | 2010-12-31 | Zinc penetration oil sleeve coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201943605U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033112A (en) * | 2014-06-25 | 2014-09-10 | 山东鸿盛石油化工装备有限公司 | Corrosion resisting and button adhesion preventing coupling |
| CN112824642A (en) * | 2019-11-20 | 2021-05-21 | 宝山钢铁股份有限公司 | Buttress thread joint with high anti-thread gluing performance |
-
2010
- 2010-12-31 CN CN2010207003578U patent/CN201943605U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033112A (en) * | 2014-06-25 | 2014-09-10 | 山东鸿盛石油化工装备有限公司 | Corrosion resisting and button adhesion preventing coupling |
| CN112824642A (en) * | 2019-11-20 | 2021-05-21 | 宝山钢铁股份有限公司 | Buttress thread joint with high anti-thread gluing performance |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20161231 |