CN2670580Y - Buttress thread oil pipe connector - Google Patents
Buttress thread oil pipe connector Download PDFInfo
- Publication number
- CN2670580Y CN2670580Y CNU032596839U CN03259683U CN2670580Y CN 2670580 Y CN2670580 Y CN 2670580Y CN U032596839 U CNU032596839 U CN U032596839U CN 03259683 U CN03259683 U CN 03259683U CN 2670580 Y CN2670580 Y CN 2670580Y
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- oil pipe
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Abstract
The utility model relates to the technical field of oil well pipe thread connection, in particular to an oil and sleeving thread joint, comprising a pipe body external thread piece and a coupling internal thread piece. The threads in an external thread piece 1 and an internal thread piece 2 are formed as buttress thread, with thread pitch 8 teeth per inch and dedendum from 1 to 1.2 millimeters. On the external thread piece 1, an end-face circular bead 4 is designed with an angle of 15 degrees; after being tightened, the end-face circular bead 4 can tightly fit with the internal torque circular bead, with an angle of 15 degrees, of the internal thread piece 2. After being tightened, the internal thread piece and external thread piece have at least one circle of thread closely fitted and the top thread teeth of the thread piece is parallel to the oil pipe shaft line. The inner diameter d2 of the internal thread piece 2 is approximately the same with the inner diameter of the external thread piece 1. The buttress thread oil pipe connector, which has the advantages of better sealing performance, higher connection strength and favorable anti-over-torque pin jumping ability, can be in place of the heavy wall pipes.
Description
Technical field
The utility model relates to oil well pipe thread link technique field, particularly a kind of oil, casing thread connection.
Background technology
Widely used API oil pipe generally divides plain end oil well pipe and heavy wall tubing two classes on the oil field at present, and its type of attachment adopts the Taper Pipe round thread to connect.For plain end oil well pipe, specification is less than 4, and " oil pipe (101.6mm) adopts the round thread of per inch (25.4mm) 10 teeth, and the tooth depth of this screw thread is 1.412mm; For specification is the plain end oil well pipe of 4 " (101.6mm) with 41/2 ", adopts the round thread of per inch 8 teeth, and the tooth depth of this screw thread is 1.810mm.The shortcoming of plain end oil well pipe maximum is that bonding strength is low, generally has only 60%～80% of body, therefore damages occurring in screw connection point mostly.In order to remedy this shortcoming, adopt at present the thick method of pier, i.e. heavy wall tubing are carried out in pipe end machining screw position.The screw thread of heavy wall tubing is the round thread of per inch 8 teeth, and the tooth depth of screw thread is 1.810mm.The advantage of this type of attachment is to make the joint bonding strength obtain certain raising, but upsetting process has caused the processing cost rising.Simultaneously, because joint area is thicker than body, the annular space area reduced when oil pipe was gone into the well, and being lowered to smoothly of oil pipe brought adverse influence.
If oil pipe can adopt buttress thread to connect, can improve its bonding strength greatly, reduce the possibility of oil pipe slippage, fracture damage.But connect for the buttress thread oil pipe, also do not retrieve correlation technique at present, one of reason is that the anti-leakage ability of buttress thread form is poor than round thread, and former two is that the buttress thread form is easy to thread gluing when being used for the less oil pipe of size therefore.
The utility model purpose
The purpose of this utility model is to design a kind of bonding strength height, good seal performance, and lower-cost buttress thread oil pipe connector uses the oil pipe of this joint can replace heavy wall tubing to use.
According to the design scheme that the utility model provides, connector is twisted to connect by external thread piece and inner thread piece and is formed, and it is characterized in that: the screw thread on external thread piece and the inner thread piece is a buttress thread.
The pitch of buttress thread is per inch 8 teeth, tooth depth h
2It is 1～1.2 millimeter.The external thread piece design has-15 ° of end face shoulders, tightens-15 ° of internal torque shoulder interference fit of back and inner thread piece.After internal and external screw thread spare is tightened, have at least a circle screw thread to fit tightly.The thread end face of screw element is parallel to the oil pipe axis.The inner diameter d 2 of internal thread is approximate identical with the inner diameter d of external thread piece 1.
China's oil field oil recovery oil pipe that uses is divided into two classes: a class is a plain end oil well pipe, and joint efficiency is lower; One class is a heavy wall tubing, though joint efficiency increase, need be to the bulk processing of oil pipe pier, oil pipe cost height, and since joint area thick, being lowered to smoothly of oil pipe brought adverse influence.Therefore according to the reality in China oil field, press for a kind of bonding strength height of exploitation, good seal performance, oil pipe that price is lower again.
Because screw thread has adopted the high buttress thread form of joint efficiency among the design, and carried out suitable improvement according to loading characteristic double thread parameter, make the bonding strength of this joint meet or exceed body, help to solve present oil field and exist wider oil pipe screw thread slippage to fall the well problem.On bonding strength, this oil pipe is far superior to plain end oil well pipe, also reaches and surpassed the bonding strength of heavy wall tubing, this oil pipe does not need the technology of pier bulk processing simultaneously, the lumber recovery height, and processing cost is lower, joint area does not resemble the heavy wall tubing thick yet, is beneficial to the oil field and uses.
Aspect sealing performance, the design has also adopted adequate measures.In general, trapezoidal thread is owing to its structure design, and sealability will be lower than round thread.This main because the gap between at the bottom of trapezoidal thread engagement back tooth top and the tooth and the gap between the flank are greater than the gap of round thread, and the leakage path area that causes trapezoidal thread is greater than round thread.The design's double thread parameter is optimized, and guaranteeing to have at least a circle screw thread is to fit tightly, very close to each other, thereby the sealability of joint is improved greatly.In addition ,-15 ° of shoulders are tightened the back and are produced interference fit, also play good sealing function.Owing to adopted this two measures, made the sealability of this joint be not less than round thread.
The utility model joint is as general as the tapered thread joint, and its tapering is 1: 16.It is twisted to be connected together by external thread piece and inner thread piece and forms.Form of thread is improved buttress thread, improves mainly to show following three aspects: one, the tooth depth h of this screw thread
2Be 1～1.2mm, do not adopt reference addendum; Two, the tooth top of this screw thread is parallel to tube axis, is easy to make-up when making button, rather than is parallel to element of cone; Three, it is very close to each other having a circle screw thread after this screw thread is tightened at least, rather than has leakage-gap at the bottom of regular screw threads cooperation rear thread tooth top and the tooth.In addition, the external screw thread front end is processed into-15 ° of angles, with-15 ° of shoulder interference fit formation sealings of internal thread.
Compared with prior art, the utility model has marked improvement, is in particular in: 1) be threaded and adopt improved buttress thread form, needn't be to the bulk processing of body pier, can make its bonding strength reach identical, reduce processing cost, help the oil field simultaneously and use with body.Make at least one circle screw thread very close to each other when 2) threaded portion designs, and adopt-15 ° of shoulders to cooperate, make screw thread have excellent sealing performance, be not less than the sealability of round thread.3) internal diameter of joint (inner thread piece) and oil pipe (external thread piece) internal diameter are basic identical, avoid the pipe inner fluid to produce turbulent flow, and logging tool can be lowered to smoothly.
Description of drawings
Fig. 1 is a structure chart of the present utility model.
Fig. 2 is shoulder part-structure figure.
Fig. 3 is thread tooth figure of the present utility model.
Fig. 4 is the flat trapezoidal thread profile of tooth of API.
Fig. 5,6 is respectively the enlarged drawing of I among Fig. 1, II.
The specific embodiment
First embodiment of the design is the oil pipe that is used for 73.03 * 5.51mm, and grade of steel is N80.Body is that the external diameter of external thread piece 1 is 73.03mm, and wall thickness is 5.51mm, material behavior: yield strength σ s=670Mpa, tensile strength is σ b=820Mpa.Box cupling is that the external diameter of inner thread piece 2 is 88.9mm, and material behavior is with external thread piece 1.External screw thread on the external thread piece does not carry out surfacing, the internal thread copper facing on the inner thread piece 2, and about 30 microns of thickness, thread compound adopts the API thread compound.This product bonding strength reaches and the body equal strength, and sealing performance is not less than same specification, with 10 tooth round thread oil pipes of grade of steel, and can satisfy 10 times and go up shackle and the requirement of not thread gluing.Screw thread on external thread piece 1 and the inner thread piece 2 adopts buttress thread, and its pitch is per inch 8 teeth, and tooth depth is h
2Be 1～1.2 millimeter, space width l
2Be 3.175 millimeters, and the profile of tooth of standard as shown in Figure 4: its tooth depth h
1Be 1.575 millimeters, space width l
2It is 5.08 millimeters.Design has-15 ° of end face shoulders 4 on the external thread piece 1, tightens-15 ° of internal torque shoulder 7 interference fit of back and inner thread piece 2, after internal and external screw thread spare is tightened, have at least a circle screw thread to fit tightly, see Fig. 5,6, wherein, Fig. 5 is the gapped state of between cog, and Fig. 6 is the gapless state of between cog.The thread end face of screw element is parallel to the oil pipe axis, and the inner diameter d 2 of internal thread 2 is approximate identical with the inner diameter d of external thread piece 11.Among Fig. 13,6 refers to the tooth on the internal and external threads spare 2,1 respectively.
Second embodiment of the design is identical with first embodiment basically, and different is that the oil pipe specification is 60.3 * 4.83mm.
The design's the 3rd embodiment is identical with first embodiment basically, and different is that the oil pipe specification is 88.9 * 6.45mm.
Claims (6)
1, a kind of buttress thread oil pipe connector is formed by external thread piece (1) and stubborn the connecing of inner thread piece (2), and it is characterized in that: the screw thread on external thread piece (1) and the inner thread piece (2) is a buttress thread.
2, connector according to claim 1 is characterized in that: the pitch of buttress thread is per inch 8 teeth, and tooth depth is 1～1.2 millimeter.
3, connector according to claim 1 is characterized in that: external thread piece (1) design has-15 ° of end face shoulders (4), tightens-15 ° of internal torque shoulder interference fit of back and inner thread piece (2).
4, connector according to claim 1 is characterized in that: after internal and external screw thread spare is tightened, have at least a circle screw thread to fit tightly.
5, connector according to claim 1 is characterized in that: the thread end face of screw element is parallel to the oil pipe axis.
6, connector according to claim 1 is characterized in that: the inner diameter d 2 of internal thread (2) is approximate identical with the inner diameter d 1 of external thread piece (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032596839U CN2670580Y (en) | 2003-07-18 | 2003-07-18 | Buttress thread oil pipe connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032596839U CN2670580Y (en) | 2003-07-18 | 2003-07-18 | Buttress thread oil pipe connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2670580Y true CN2670580Y (en) | 2005-01-12 |
Family
ID=34473437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032596839U Expired - Fee Related CN2670580Y (en) | 2003-07-18 | 2003-07-18 | Buttress thread oil pipe connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2670580Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852469A (en) * | 2012-04-25 | 2013-01-02 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve joint |
-
2003
- 2003-07-18 CN CNU032596839U patent/CN2670580Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852469A (en) * | 2012-04-25 | 2013-01-02 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve joint |
| CN102852469B (en) * | 2012-04-25 | 2015-06-10 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve joint |
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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: 20050112 Termination date: 20120718 |