CN2698956Y - Anti-wear and anti-corrosive coupling - Google Patents
Anti-wear and anti-corrosive coupling Download PDFInfo
- Publication number
- CN2698956Y CN2698956Y CN 200420040611 CN200420040611U CN2698956Y CN 2698956 Y CN2698956 Y CN 2698956Y CN 200420040611 CN200420040611 CN 200420040611 CN 200420040611 U CN200420040611 U CN 200420040611U CN 2698956 Y CN2698956 Y CN 2698956Y
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- CN
- China
- Prior art keywords
- box cupling
- coupling
- wear
- resistant
- utility
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- Expired - Fee Related
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides an anti-wear and anti-corrosive coupling, and the utility model belongs to a component on a pumping rod for the petroleum production in the oil field. The utility model has a cylindric coupling body. A concave flat surface is arranged on the middle part of the coupling body. Screw threads are arranged on the inner surface of the coupling body. A coating layer which is wear resistant and corrosion resistant is sprayed on the outer surface of the coupling body. The shapes of the profiles of the end angles on both ends of the coupling body look like smooth circular arc. Because the end angles of the coupling are smooth circular arc, when the coupling is rubbed with an oil pipe, the coupling can not cause scraped finish for the inner wall of the oil pipe, and therefore the coupling self has favorable wear resistant and corrosion-resistant performances. Simultaneously the useful life is improved, and the useful life of the oil pipe is improved.
Description
Technical field
The utility model provides a kind of oil field to recover the oil with the parts on the sucker rod, especially a kind of improved box cupling.
Background technology
Extensively adopt oil pumper sucker rod pumping mode in the oil exploitation process.This oil production method is mainly used oil pumper, sucker rod and oil well pump.Sucker rod be installed in and under oil pipe in, move up and down under the drive of oil pumper on the ground, the crude oil that the oil well pump of down-hole is pumped is evacuated to ground.Because oil well is darker, sucker rod has more piece, links together by box cupling between each joint.Because also rod sag or the tubing bending that tiltedly causes all can cause the friction of sucker rod and oil pipe.Especially box cupling fracture, dropout because of external diameter is rubbed at first greater than sucker rod, thereby are caused in the box cupling position, make the following sucker rod of box cupling of fracture place fall into the down-hole.At this moment, must repair and operation, this can cause the reduction of economic loss and oil well output.In addition, owing to contain a certain amount of corrosivity composition in the crude oil, also can cause the damage of box cupling because of corrosion.For this reason, the someone works out the box cupling that a kind of external surface is coated with the abrasion-proof corrosion-proof erosion resisting coating, has improved its wear-corrosion resistance.But the recessed plane and the joint angle of rounded outer surface are chamfering on the end angle at this box cupling two ends and the box cupling, and straightedge is promptly arranged.Therefore, though the abrasion resistance of box cupling itself has improved, because the existence of straightedge, when box cupling and tube inner wall friction, this straightedge can cause scraped finish to tube inner wall.After for a long time scraped finish being carried out in the somewhere, can cause this place's oil pipe wall thickness attenuation, finally can worn out oil pipe or cause the oil pipe bending, cause oil can not carry out oil producing operation.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of wear-resistant rotten box cupling is provided, and it not only self has good wear-corrosion resistance, can also avoid the generation of box cupling to the scraped finish phenomenon of tube inner wall.
The utility model is to realize like this, wear-resistant rotten box cupling, it has and is box cupling body cylindraceous, and there is recessed plane at the middle part of box cupling body, the inner surface of box cupling body has screw thread, external surface to be coated with the coating of wear resistant corrosion resistant, and the section at the end angle at box cupling body two ends is level and smooth circular arc.
Adopt the wear-resistant rotten box cupling of said structure, because the end angle is level and smooth circular arc, therefore when box cupling and oil pipe generation friction, box cupling can not cause scraped finish to tube inner wall, thereby self has good wear-corrosion resistance, when improving application life, the application life of also having improved oil pipe.
Description of drawings
Fig. 1 is the main pseudosection of the utility model structure.
Fig. 2 is the A-A sectional drawing of Fig. 1.
Among the figure, 1-box cupling body, the 2-coating, the 3-plane, the 4-joint angle, the 5-screw thread, 6-holds the angle.
The specific embodiment
The embodiment that provides below in conjunction with accompanying drawing illustrates concrete structure of the present utility model.
As shown in drawings, the wear-resistant rotten box cupling of the utility model, it has and is box cupling body cylindraceous (1), there is recessed plane (3) at the middle part of box cupling body, the inner surface of box cupling body has screw thread (5), external surface to be coated with the coating (2) of wear resistant corrosion resistant, and the section at the end angle (6) at box cupling body (1) two ends is level and smooth circular arc.The box cupling of this structure can prevent the scraped finish of the end angle at box cupling body two ends to tube inner wall.
On described box cupling body (1), the recessed plane (3) at middle part is level and smooth circular arc with the section of the joint angle (4) of the rounded outer surface of both sides.Joint angle was to the scraped finish of tube inner wall when the box cupling of this structure can prevent simultaneously that the end angle at box cupling body two ends and box cupling are crooked.
It is the nickel alloy of Ni60A that coating can adopt the trade mark, and this is a kind of carbide alloy.Certainly, also can adopt other suitable Hardmetal materials.After the box cupling external surface is eliminated rust alligatoring and activation processing, adopt hot spray mode will be pulverous carbide alloy and be sprayed on the box cupling external surface.After the spraying, the thickness of coating is about 0.75 millimeter, and for improving its finish, available centerless grinder grinds off about 0.25 millimeter.
According to the size of sucker rod, box cupling can have plurality of specifications such as Φ 19, Φ 22, Φ 25.
Recessed plane (3) has symmetry, parallel two usually.Spanner is stuck on the plane, can finishes the loading and unloading between box cupling and the sucker rod.
During use, this box cupling links together the lower end of the threaded last joint sucker rod of external surface, the upper end of next joint sucker rod by the screw thread (5) of its inner surface, thereby realizes the connection of two joint sucker rods.
Claims (2)
1, wear-resistant rotten box cupling, it is characterized in that, it has and is box cupling body cylindraceous (1), there is recessed plane (3) at the middle part of box cupling body, the inner surface of box cupling body has screw thread (5), external surface to be coated with the coating (2) of wear resistant corrosion resistant, and the section at the end angle (6) at box cupling body (1) two ends is level and smooth circular arc.
2, wear-resistant rotten box cupling as claimed in claim 1 is characterized in that, on described box cupling body (1), the recessed plane (3) at middle part is level and smooth circular arc with the section of the joint angle (4) of the rounded outer surface of both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420040611 CN2698956Y (en) | 2004-05-16 | 2004-05-16 | Anti-wear and anti-corrosive coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420040611 CN2698956Y (en) | 2004-05-16 | 2004-05-16 | Anti-wear and anti-corrosive coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2698956Y true CN2698956Y (en) | 2005-05-11 |
Family
ID=34774387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420040611 Expired - Fee Related CN2698956Y (en) | 2004-05-16 | 2004-05-16 | Anti-wear and anti-corrosive coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2698956Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995690B (en) * | 2006-12-25 | 2010-06-09 | 安东石油技术（集团）有限公司 | Fiber composite reinforced coupler |
| CN101949267A (en) * | 2010-09-13 | 2011-01-19 | 康庆刚 | Drill rod connecting hoop |
-
2004
- 2004-05-16 CN CN 200420040611 patent/CN2698956Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995690B (en) * | 2006-12-25 | 2010-06-09 | 安东石油技术（集团）有限公司 | Fiber composite reinforced coupler |
| CN101949267A (en) * | 2010-09-13 | 2011-01-19 | 康庆刚 | Drill rod connecting hoop |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |