CN202391369U - Metal sealed expansion pipe used in petroleum drilling and production - Google Patents
Metal sealed expansion pipe used in petroleum drilling and production Download PDFInfo
- Publication number
- CN202391369U CN202391369U CN201120476813XU CN201120476813U CN202391369U CN 202391369 U CN202391369 U CN 202391369U CN 201120476813X U CN201120476813X U CN 201120476813XU CN 201120476813 U CN201120476813 U CN 201120476813U CN 202391369 U CN202391369 U CN 202391369U
- Authority
- CN
- China
- Prior art keywords
- petroleum drilling
- expansion tube
- pipe
- expansion pipe
- metallic seal
- 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
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Abstract
The utility model relates to a metal sealed expansion pipe used in petroleum drilling and production, which comprises a pipe body. An external thread is arranged at one end of the pipe, an internal thread is arranged at the other end of the pipe body, a plurality of circular protrusions with circular-arc-shaped roots are arranged on an outer circumferential surface of the pipe body. Due to the arrangement of the circular protrusions with circular-arc-shaped roots on the outer circumferential surface of the pipe body, stress concentration caused during plastic deformation can be greatly reduced, overall strength of the deformed expansion pipe can be improved, and service life of expansion pipe can be prolonged.
Description
Technical field
The utility model relates to a kind of OCTG, relates to a kind of employed metallic seal expansion tube when in the oil exploitation process, drilling well being repaired specifically.
Background technology
The down-hole sealing is operation means commonly used in the engineerings such as oil drilling, completion, oil recovery, underground work; It is the link that often runs in the petroleum drilling and mining process; All be as seal for a long time with rubber; But the oil resistant of rubber seal, wear-resisting, high temperature resistant, resistance to abrasion is poor, is not enough to satisfy some specific (special) requirements of oil field development.And that metallic seal has is high temperature resistant, high pressure resistant, corrosion-resistant, the life-span long, carry many advantages such as big, is fit to very much the underground work condition as the sealed-for-life instrument, and metallic seal is receiving concern more and more widely.The sealing principle of metal seal is: metallic seal is to make the metal expansion pipe that is lowered in the oil gas well well produce expanded radially through methods such as machinery or hydraulic pressure; Expansion tube produces plastic strain; Expansion tube is close on the outer field sleeve pipe, and metal expansion pipe and sleeve pipe produce the interference sealing.
Though metallic seal has more advantage,, in petroleum drilling and mining; Also than higher, not only must have enough intensity to the requirement of expansion tubing string, tough, high temperature resistant, erosion resistant, wear-resistant and anti-breaking; Present expansion tube is because structure design is unreasonable; Plastic strain is prone to produce stress concentrates, and greatly reduces the tough and the integral intensity of expansion tube, has shortened the application life of expansion tube.
The utility model content
The problem that the utility model will solve is to above problem, provide a kind of plastic strain stress concentrate little, bulk strength is high, the petroleum drilling and mining of long service life is used the metallic seal expansion tube.
For addressing the above problem; The technical scheme that the utility model adopted is: petroleum drilling and mining is used the metallic seal expansion tube, comprises body, and an end of said body is provided with external screw thread; The other end of said body is provided with internal thread, and the outer circumference surface of said body is provided with several annular protrusions.
A kind of concrete prioritization scheme, the several ringlike convexity axially is uniformly distributed with along body.
A kind of concrete prioritization scheme, said body are provided with a female end and are provided with annular groove and annular positioning groove.
A kind of concrete prioritization scheme, said internal thread and external screw thread are tapered thread.
The utility model is taked above technical scheme; Have the following advantages: the excircle of body is provided with annular protrusion; The root of annular protrusion is a circular arc; The stress that can reduce greatly to produce in the plastic history is concentrated, and improves the bulk strength of distortion back expansion tube, thereby has prolonged the application life of expansion tube.
This expansion tube is simple in structure, and construction reliability is high, good airproof performance, and leave very big run through casing size, greatly improved the Practical Performance of sealing.
The utility model is needed the seal section position to the down-hole down, with the method for machinery or hydraulic pressure, from lower to upper; Make the utility model dilatancy through pulling force or hydraulic pressure, squeezing bushing inwall after expanding in the annular protrusion place produces the metal interference fit with internal surface of sleeve pipe; Form sealing; Its sealability reaches more than the 42MPa, and supporting capacity and bearing torque ability all above the requirement of working environment at coal mines, can reach instructions for use fully.
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Description of drawings
Accompanying drawing 1 is the structural representation of the utility model embodiment PetroChina Company Limited. drilling with the metallic seal expansion tube.
Among Fig. 1:
The 1-body; The 2-annular protrusion; The 3-annular groove; The 4-annular positioning groove.
The specific embodiment
Embodiment: shown in accompanying drawing 1, petroleum drilling and mining is used the metallic seal expansion tube, comprises body 1, and an end of body 1 is provided with external screw thread, and the other end of body 1 is provided with internal thread, and the outer circumference surface of body 1 is provided with three annular protrusions 2.
Three annular projections 2 axially are uniformly distributed with along body 1, have spacing between two adjacent annular protrusions 2, can increase or reduce the quantity of annular protrusion 2 as required.
The root of annular protrusion 2 is a circular arc, can reduce the stress that expansion tube produces and concentrate in plastic history.
Body 1 is provided with a female end and is provided with annular groove 3 and annular positioning groove 4.
Internal thread and external screw thread are tapered thread.
Expansion tube from lower to upper, makes body 1 distortion through pulling force or pressure with the method for machinery or hydraulic pressure; When pressure passes through annular protrusion 2 places, expand in annular protrusion 2 places, and external diameter enlarges; The external diameter of its expansion surpasses the inwall of sleeve pipe; The inwall of squeezing bushing, the inwall generation metal interference fit with sleeve pipe forms metallic seal.
Claims (4)
1. petroleum drilling and mining is used the metallic seal expansion tube; Comprise body (1); It is characterized in that: an end of said body (1) is provided with external screw thread, and the other end of said body (1) is provided with internal thread, and the outer circumference surface of said body (1) is provided with several annular protrusions (2).
2. petroleum drilling and mining as claimed in claim 1 is used the metallic seal expansion tube, it is characterized in that: protruding (2) axially being uniformly distributed with along body (1) of several ringlike.
3. petroleum drilling and mining as claimed in claim 2 is used the metallic seal expansion tube, it is characterized in that: said body (1) is provided with a female end and is provided with annular groove (3) and annular positioning groove (4).
4. petroleum drilling and mining as claimed in claim 1 is used the metallic seal expansion tube, it is characterized in that: said internal thread and external screw thread are tapered thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120476813XU CN202391369U (en) | 2011-11-25 | 2011-11-25 | Metal sealed expansion pipe used in petroleum drilling and production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120476813XU CN202391369U (en) | 2011-11-25 | 2011-11-25 | Metal sealed expansion pipe used in petroleum drilling and production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202391369U true CN202391369U (en) | 2012-08-22 |
Family
ID=46666300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120476813XU Expired - Fee Related CN202391369U (en) | 2011-11-25 | 2011-11-25 | Metal sealed expansion pipe used in petroleum drilling and production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202391369U (en) |
-
2011
- 2011-11-25 CN CN201120476813XU patent/CN202391369U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 Termination date: 20121125 |