CN2632293Y - Combined connecting coupling for oil pipe - Google Patents
Combined connecting coupling for oil pipe Download PDFInfo
- Publication number
- CN2632293Y CN2632293Y CN 03265555 CN03265555U CN2632293Y CN 2632293 Y CN2632293 Y CN 2632293Y CN 03265555 CN03265555 CN 03265555 CN 03265555 U CN03265555 U CN 03265555U CN 2632293 Y CN2632293 Y CN 2632293Y
- Authority
- CN
- China
- Prior art keywords
- oil pipe
- thread
- coupling
- oil
- utility
- 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 - Fee Related
Links
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The utility model relates to a compound connection oil pipe coupling, which mainly solves the issue that the stress concentration in existed coupling is easy to bring fatigue fracture. The utility model is characterized in that the end tap of the oil pipe (4) is connected to the inner wall of the coupling body (1) in the form of taper thread (2), the end tap of the coupling body (1) is connected to the oil pipe (4) in the form of same thread and same screw pitch flat thread (3). The oil pipe coupling can relieve the stress concentration of oil pipe outer thread root in the single taper thread connection, which is not easy to produce fatigue fracture and the connection effect is perfect. The utility model can effectively prevents happening of oil well column fracture and falling incident.
Description
Technical field:
The utility model relates to the used box cupling of oil-water well tubing string in the oil recovery field, oil field, particularly compound interconnection system tubing coupling.
Background technology:
In oilfield development process, by forming running string by many oil pipes, by tubing string underground crude oil is gathered in the down-hole that oil well pump is lowered to several kms, the oil pipe of tubing string is to adopt box cupling to connect, and present employed link technique is a taper pipe thread, the box cupling inwall is a tapered thread, oil-pipe external wall is a tapered thread with matching, the extruding that the external screw thread of oil pipe is subjected to the box cupling internal thread in this connected mode is compressed, produce a belt stress concentrated area in the end that internal and external threads connects, under the effect of down-hole fluctuating load, be easy to produce fatigue fracture, cause oil well pipe to break and take off.Often cause down-hole accident, bring serious loss to production.
The utility model content:
The extruding that is subjected to the box cupling internal thread for the external screw thread that overcomes oil pipe in the existing tubing string link technique is compressed the deficiency that produces the concentrated easy fatigue fracture of stress, the utility model provides a kind of compound interconnection system tubing coupling, it is concentrated that this tubing coupling can avoid the external screw thread root of oil pipe to produce stress, be difficult for producing fatigue fracture, good connecting effect.
The technical scheme that the utility model adopted is: this compound interconnection system tubing coupling, comprise hoop body and oil pipe, and the oil pipe termination is connected in the tapered thread mode with box cupling body inwall, and the termination of box cupling body and oil pipe are to be connected with pitch flat pattern engage thread with screw thread.
The beneficial effects of the utility model are: because this tubing coupling is extended for the identical flat pattern screw thread of spiral shell square at the root of tapered thread, the termination that is the box cupling body has adopted flat pattern to be threaded with oil pipe, the connected mode of this compound connection has the characteristics that single taper thread connection termination stress is concentrated of alleviating, this compound thread is processing and difficult generation fatigue fracture easily, good connecting effect, therefore can effectively avoid the often accident generation of fracture of down-hole string oil tube external thread root, what help recovering the oil and producing carries out smoothly.
Description of drawings:
Fig. 1 is the utility model structure sectional view.
1-box cupling body among the figure, 2-tapered thread, 3-flat pattern screw thread, 4-oil pipe.
The specific embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in fig. 1, this compound interconnection system tubing coupling, comprise box cupling body 1 and oil pipe 4, oil pipe 4 terminations are connected with tapered thread 2 with box cupling body 1 inwall, the termination of box cupling body 1 is connected with flat pattern screw thread 3 with oil pipe 4, make this tubing coupling be extended for the identical flat pattern screw thread 3 of spiral shell square at the root of tapered thread 2, the termination that is box cupling body 1 has adopted flat pattern screw thread 3 to be connected with oil pipe 4, screw thread is processed than being easier to like this, under the effect of down-hole fluctuating load, have the advantages that relieve stresses is concentrated, be difficult for producing fatigue fracture, therefore good connecting effect can not make down-hole oil tube 2 and box cupling body 1 throw off.
Compound interconnection system tubing coupling owing to adopted such scheme, can effectively be avoided the often accident generation of fracture of down-hole string oil tube external thread root, and what help recovering the oil and producing carries out smoothly.
Claims (1)
1, a kind of compound interconnection system tubing coupling, comprise box cupling body (1) and oil pipe (4), it is characterized in that: oil pipe (4) termination is connected in tapered thread (2) mode with box cupling body (1) inwall, and the termination of box cupling body (1) and oil pipe (4) are to be connected with pitch flat pattern screw thread (3) mode with screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03265555 CN2632293Y (en) | 2003-06-12 | 2003-06-12 | Combined connecting coupling for oil pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03265555 CN2632293Y (en) | 2003-06-12 | 2003-06-12 | Combined connecting coupling for oil pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2632293Y true CN2632293Y (en) | 2004-08-11 |
Family
ID=34297822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03265555 Expired - Fee Related CN2632293Y (en) | 2003-06-12 | 2003-06-12 | Combined connecting coupling for oil pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2632293Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108817854A (en) * | 2018-05-24 | 2018-11-16 | 上海天阳钢管有限公司 | A kind of process manufacturing compound oil well pipe hoop |
-
2003
- 2003-06-12 CN CN 03265555 patent/CN2632293Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108817854A (en) * | 2018-05-24 | 2018-11-16 | 上海天阳钢管有限公司 | A kind of process manufacturing compound oil well pipe hoop |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101144377B (en) | Oil well sucker rod pump oil pumping completion tubular pile plugging device with pressure | |
| CN201013257Y (en) | Oil pipe coupling | |
| CN2632293Y (en) | Combined connecting coupling for oil pipe | |
| CN201221652Y (en) | Oil conduit screw connection structure | |
| CN200952374Y (en) | Multifunction gas production well head device | |
| CN2851511Y (en) | Diameter-variable screwed joint structure of petroleum casing pipe | |
| CN201778676U (en) | Low pressure-resistant air-tight seal sleeve joint | |
| CN201059164Y (en) | Novel torsion-resistant disconnecting-proof pumping rod | |
| CN201406993Y (en) | Direct-connected oil and gas well pipe | |
| CN201334885Y (en) | Variable diameter bottom flange | |
| CN201103372Y (en) | Sucker-rod pumping well completion tubular pile plugging device for oil well operation under pressure | |
| CN203531767U (en) | Eight-tooth cylinder threaded connector | |
| CN2898292Y (en) | Settling eccentric sand gas-proofing apparatus | |
| CN201786273U (en) | Skinner's macaroni for non-standard workover | |
| CN201513641U (en) | Bending resistant anti-compression low contact stress oil sleeve threading connector | |
| CN2825920Y (en) | Tubing with integral joint | |
| CN202926237U (en) | Heavy caliber double-thread oil casing | |
| CN2668824Y (en) | Device for reducing friction resistant force of sound well pipe-column | |
| CN201705223U (en) | Small casing pipe well oil pipe | |
| CN115324494A (en) | High-performance threaded joint for quick connecting sleeve | |
| CN202215158U (en) | High-performance oil-casing-pipe screwed joint structure | |
| CN203531775U (en) | Straight-thread connector with three torque shoulders | |
| CN108798551B (en) | Surface sleeve threaded joint structure with large outer diameter and thin wall thickness | |
| CN201466659U (en) | Cable connection structure for oil gas exploitation intellect drill string adapter | |
| CN2833094Y (en) | Expansion casing string |
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 |