CN202578555U - Special buttress thread oil casing joint - Google Patents
Special buttress thread oil casing joint Download PDFInfo
- Publication number
- CN202578555U CN202578555U CN 201220181550 CN201220181550U CN202578555U CN 202578555 U CN202578555 U CN 202578555U CN 201220181550 CN201220181550 CN 201220181550 CN 201220181550 U CN201220181550 U CN 201220181550U CN 202578555 U CN202578555 U CN 202578555U
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Abstract
The utility model relates to a special buttress thread oil casing joint which comprises a coupling hoop and a pipe body which are connected through threads; an annular inner stair cylindrical surface is arranged at the axial middle part of the inner wall of the coupling hoop; standard buttress inner threads are machined at two ends of the coupling hoop; wedged inner threads are arranged at the rear end (close to the inner stair cylindrical surface) of buttress inner threads; a standard buttress outer thread is machined at the outer wall of the end part of the pipe body; a wedged outer thread is arranged at the front end of the buttress outer thread; and a flank angle of the wedged inner thread and the wedged outer thread is of a negative angle. By adding the wedged threads at the end parts of the standard buttress inner threads at the coupling hoop and the pipe body, the connection strength and the tooth-form sealing capability of the joint are enhanced, and the anti-tripping capability of the joint is improved; by additionally arranging an anti-torque shoulder between a pipe end and the coupling loop, the anti-torque property and the compression load resistance property of the joint are further improved.
Description
Technical field
The utility model relates to the oil well pipe thread joint that is applied to petroleum industry, specifically a kind of special buttress thread oil sleeve joint.
Background technology
Tubing and casing in the oil well pipe industry mainly is to couple together through nipple, forms oil casing, and length reaches thousands of rice, the requirement of strength, the sealing performance that connect of nipple wherein, the having relatively high expectations of each side such as tensile load and torque resistant performance.
Existing API (American Petroleum Institute (API)) buttress thread joint, exist the torque resistant performance a little less than, bonding strength is low, the anti-deficiencies such as ruining ability of squeezing makes oil well pipe company or oil field seek the better and reliable special thread syndeton of performance gradually.
Summary of the invention
The utility model provides a kind of special buttress thread oil sleeve joint to the problems referred to above, and this joint bonding strength is high, and incompressible load can be strong, and the torque resistant performance is high simultaneously.
Technical scheme according to the utility model: a kind of special buttress thread oil sleeve joint; Comprise box cupling and body through being threaded; The axial middle part of said box cupling inwall is provided with the interior step cylinder of ring-type; The two ends of said box cupling are processed with the inclined to one side trapezoidal internal thread of standard, and said inclined to one side trapezoidal internal thread is provided with the wedge shape internal thread near the rear end of step cylinder in said, is processed with the trapezoidal partially external screw thread of standard on the outer wall of said body end; Said trapezoidal partially externally threaded front end is provided with the wedge shape external screw thread, and the externally threaded tooth side angle of said wedge shape internal thread and said wedge shape is a negative angle.
The value of said tooth side angle is 5 ° ~ 15 °.The externally threaded tooth number of said wedge shape internal thread and said wedge shape is 1 ~ 5 tooth.The end of step cylinder is provided with the internal torque shoulder in the said box cupling, and said internal torque shoulder is provided with recessed interior shoulder angle, and said interior shoulder angle is near chamfering in the outward-dipping formation in one side of said box cupling axis; The end of said body is provided with the outer torque shoulder that matches with said internal torque shoulder, and said outer torque shoulder is provided with the outer shoulder angle of protrusion, one side said outer shoulder angle forms outer chamfering near sloping inwardly of said body axis.
Be provided with inner sealing surface between said internal torque shoulder and the said wedge shape internal thread, be provided with the external seal face between said outer torque shoulder and the said wedge shape external screw thread.The equal in length of the length of said inner sealing surface and said external seal face is 1.5 ~ 5.0mm.The value of shoulder angle is 90 ° ~ 130 ° in said, and the value of said outer shoulder angle is bigger 0 ~ 2 ° than the value of shoulder angle in said, and the value of said interior chamfering is 20 ° ~ 50 °, and the value of said outer chamfering equates with the value of said interior chamfering.The value of said outer shoulder angle than the value of shoulder angle in said big 0.5 ° ~ 1 °.Said outer shoulder thickness equates with said interior shoulder thickness, is 4 ~ 12mm.
Place, the summit of shoulder angle is provided with the inner vertex circular arc in said, and the radius of said inner vertex circular arc is 0.5 ~ 2.5mm; The place, summit of said outer shoulder angle is provided with outer dead centre circular arc, the big 0.2 ~ 0.5mm of radius of the said inner vertex circular arc of the radius ratio of said outer dead centre circular arc.
The technique effect of the utility model is: the utility model has increased wedge thread in the end of the standard buttress thread of box cupling and body, has increased the bonding strength and the profile of tooth sealing performance of joint, has improved the anti-dropout ability of joint; In the middle of pipe end and box cupling, increase the torque resistant shoulder, further improved the torque resistant performance and the incompressible load performance of joint.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of the utility model after decomposing.
Fig. 3 is the tooth form figure of the wedge thread in the utility model.
Fig. 4 is the enlarged drawing of the internal torque shoulder in the utility model.
Fig. 5 is the enlarged drawing of the outer torque shoulder in the utility model.
The specific embodiment
Be further described below in conjunction with the specific embodiment of accompanying drawing the utility model.
Among Fig. 1 ~ Fig. 5, comprise box cupling 1, body 2, wide by 14, the profile of tooth groove width 15 in step plane 10 in trapezoidal internal thread 3, trapezoidal partially external screw thread 4, wedge shape internal thread 5, wedge shape external screw thread 6, internal torque shoulder 7, outer torque shoulder 8, middle line 9, the box cupling, tapering 11, pitch 12, tooth depth 13, profile of tooth tooth, tooth side angle 16, profile of tooth circular arc 17, interior shoulder thickness 18, outer shoulder thickness 19, interior shoulder summit angle 20, outer shoulder summit angle 21, interior chamfering 22, outer chamfering 23, inner vertex circular arc 24, outer dead centre circular arc 25, inner sealing surface 26, external seal face 27, body 28 etc. partially.
Like Fig. 1, shown in Figure 2; The utility model is a kind of special buttress thread oil sleeve joint; Comprise box cupling 1 and body 2,28 through being threaded, box cupling 1 and body the 2, the 28th are benchmark with virtual middle line 9, screw with internal and external threads; Carry out some oil, casing strings of being connected to form with body 2 and body 28 through box cupling 1, satisfy oil gas field production instructions for use.
The axial middle part of box cupling 1 inwall is provided with the interior step cylinder 10 of ring-type, and the length range of step cylinder 10 is 50 ~ 200mm in the box cupling, increases the bonding strength and the counter-bending ability of joint.The two ends of box cupling 1 are processed with the inclined to one side trapezoidal internal thread 3 of standard, and trapezoidal internal thread 3 is provided with wedge shape internal thread 5 near the rear end of interior step cylinder 10 partially.Be processed with the trapezoidal partially external screw thread 4 of standard on the outer wall of body 2,28 ends, the front end of trapezoidal partially external screw thread 4 is provided with wedge shape external screw thread 6.Trapezoidal internal thread 3 adopts the API standard with trapezoidal partially external screw thread 4 partially.
As shown in Figure 3, wedge shape internal thread 5 is a negative angle with the tooth side angle 16 of wedge shape external screw thread 6, and the value of tooth side angle 16 is 5 ° ~ 15 °.Wedge shape internal thread 5 is that 1:16, pitch 12 are identical with the API standard for 5.08mm with the tapering 11 of wedge shape external screw thread 6, and tooth depth 13 is 0.10mm ~ 0.50mm for 1.50mm ~ 2.07mm, profile of tooth groove width 15 for 2.55mm ~ 3.03mm, profile of tooth circular arc 17 radiuses for 1.00mm ~ 1.43mm, profile of tooth tooth wide 14.Wedge shape internal thread 5 is 1 ~ 5 tooth with the tooth number of wedge shape external screw thread 6.Adding man-hour; Buttress thread should seamlessly transit when wedge thread distortion transition; Transition face length can not be greater than 1 pitch; And the tooth of its wedge shape external screw thread 6 count total length than the tooth of wedge shape internal thread 5 count big (0.3 ~ 1) the individual pitch of total length apart from length, the best is the distance of 0.5 tooth, guarantees that like this it leaves enough surpluses when cooperating and can not interfere.
As shown in Figure 4, the end of step cylinder 10 is provided with internal torque shoulder 7 in the box cupling 1, and internal torque shoulder 7 is provided with recessed interior shoulder angle 20, and interior shoulder angle 20 is near chamfering 22 in the outward-dipping formation in one side of box cupling 1 axis.The value of interior shoulder angle 20 is 90 ° ~ 130 °, and the value of interior chamfering 22 is 20 ° ~ 50 °.Be provided with inner sealing surface 26 between internal torque shoulder 7 and the wedge shape internal thread 5, the length of inner sealing surface 26 is 1.5 ~ 5.0mm, and interior shoulder thickness 18 is 4 ~ 12mm.The place, summit of interior shoulder angle 20 is provided with inner vertex circular arc 24, and the radius of inner vertex circular arc 24 is 0.5 ~ 2.5mm.
As shown in Figure 5, the end of body 2,28 is provided with the outer torque shoulder 8 that matches with internal torque shoulder 7, and outer torque shoulder 8 is provided with the outer shoulder angle 21 of protrusion, one side outer shoulder angle 21 forms outer chamfering 23 near sloping inwardly of body 2,28 axis.The value of outer shoulder angle 21 is bigger 0 ~ 2 ° than the value of interior shoulder angle 20, and is preferably big 0.5 ° ~ 1 °.The value of outer chamfering 23 equates with the value of interior chamfering 22.Be provided with external seal face 27 between outer torque shoulder 8 and the wedge shape external screw thread 6, the equal in length of the length of external seal face 27 and inner sealing surface 26, outer shoulder thickness 19 equates with interior shoulder thickness 18.The place, summit of outer shoulder angle 21 is provided with outer dead centre circular arc 25, the big 0.2 ~ 0.5mm of radius of the radius ratio inner vertex circular arc 24 of outer dead centre circular arc 25.
During the utility model operation; Any end of box cupling 1 is inserted in earlier on the body 2; Overlap and fashionablely should the external screw thread of the internal thread of box cupling 1 and body 2 be inserted in 3 ~ 7 buttons earlier, should be light and slow during hitch, with the internal and external threads make-up then manpower screw in; With manpower screw motionless be till, hand-tight box cupling that spins together 1 and body 2 usefulness petroleum pipeline screw-on machine devices are carried out further machine twist the interference fit state that connects when reaching that machine is stubborn to be connect.
When box cupling 1 and body 2 machine twist take over that being full of screws and cooperate after; Its wedge shape internal thread 5, wedge shape external screw thread 6 have reached the interference fits state and have formed certain sealing; Shoulder thickness 18 has reached interference fit with outer shoulder thickness 19 simultaneously; Both shoulder thickness and tooth depth spigot surface are on same plane because of it, and contact surface is bigger, have increased the ability of its high torque resistant performance and compressive load ability and tensile load greatly.Position that machine is tight and torque can be made separate stipulations according to API standard operation or technical papers, but shoulder thickness 18 must not have any gap with outer shoulder thickness 19 in must satisfying after machine tightly screws.Same fastening method is be that benchmark closely cooperates with virtual middle line 9 with its box cupling 1 and body 28, reach body 28 and body 2 through box cupling 1 carry out somely being connected to form oil, casing string satisfies oil gas field production instructions for use.When go into the well in the oil field, its connector machine stressed joint is one by one formed thousands of meters oil casing.
The utility model has increased wedge thread in the end of the standard buttress thread of box cupling 1 and body 2,28, has increased the bonding strength and the profile of tooth sealing performance of joint, has improved the anti-dropout ability of joint; In the middle of pipe end and box cupling, increase the torque resistant shoulder, further improved the torque resistant performance and the incompressible load performance of joint; Increase the overall length of box cupling, improved the bonding strength and the counter-bending ability of joint.
The utility model processing is simple and convenient, and the scope of application is wide, and is safe and reliable; Can bear the complicated power of extraneous high strength and apply and do not reveal or damage, satisfy the instructions for use in oil field.
Claims (10)
1. special buttress thread oil sleeve joint; Comprise box cupling (1) and body (2,28) through being threaded; The axial middle part of said box cupling (1) inwall is provided with the interior step cylinder (10) of ring-type; It is characterized in that: the two ends of said box cupling (1) are processed with the inclined to one side trapezoidal internal thread of standard (3); Said inclined to one side trapezoidal internal thread (3) is provided with wedge shape internal thread (5) near the rear end of step cylinder (10) in said; Be processed with the trapezoidal partially external screw thread of standard (4) on the outer wall of said body (2,28) end, the front end of said trapezoidal partially external screw thread (4) is provided with wedge shape external screw thread (6), and said wedge shape internal thread (5) is a negative angle with the tooth side angle (16) of said wedge shape external screw thread (6).
2. according to the described special buttress thread oil sleeve joint of claim 1, it is characterized in that: the value of said tooth side angle (16) is 5 ° ~ 15 °.
3. according to the described special buttress thread oil sleeve joint of claim 1, it is characterized in that: said wedge shape internal thread (5) is 1 ~ 5 tooth with the tooth number of said wedge shape external screw thread (6).
4. according to the described special buttress thread oil sleeve joint of claim 1; It is characterized in that: the end of the interior step cylinder of said box cupling (1) (10) is provided with internal torque shoulder (7); Said internal torque shoulder (7) is provided with recessed interior shoulder angle (20), and said interior shoulder angle (20) is near chamfering (22) in the outward-dipping formation in one side of said box cupling (1) axis; The end of said body (2,28) is provided with the outer torque shoulder (8) that matches with said internal torque shoulder (7); Said outer torque shoulder (8) is provided with the outer shoulder angle (21) of protrusion, said outer shoulder angle (21) near said body (2,28) one side sloping inwardly of axis forms outer chamfering (23).
5. according to the described special buttress thread oil sleeve joint of claim 4; It is characterized in that: be provided with inner sealing surface (26) between said internal torque shoulder (7) and the said wedge shape internal thread (5), be provided with external seal face (27) between said outer torque shoulder (8) and the said wedge shape external screw thread (6).
6. according to the described special buttress thread oil sleeve joint of claim 5, it is characterized in that: the equal in length of the length of said inner sealing surface (26) and said external seal face (27) is 1.5 ~ 5.0mm.
7. according to the described special buttress thread oil sleeve joint of claim 4; It is characterized in that: the value of shoulder angle (20) is 90 ° ~ 130 ° in said; The value of said outer shoulder angle (21) is bigger 0 ~ 2 ° than the value of shoulder angle (20) in said; The value of chamfering (22) is 20 ° ~ 50 ° in said, and the value of said outer chamfering (23) equates with the value of said interior chamfering (22).
8. according to the described special buttress thread oil sleeve joint of claim 7, it is characterized in that: the value of said outer shoulder angle (21) than the value of shoulder angle (20) in said big 0.5 ° ~ 1 °.
9. according to the described special buttress thread oil sleeve joint of claim 4, it is characterized in that: said outer shoulder thickness (19) equates with said interior shoulder thickness (18), is 4 ~ 12mm.
10. according to the described special buttress thread oil sleeve joint of claim 4, it is characterized in that: place, the summit of shoulder angle (20) is provided with inner vertex circular arc (24) in said, and the radius of said inner vertex circular arc (24) is 0.5 ~ 2.5mm; The place, summit of said outer shoulder angle (21) is provided with outer dead centre circular arc (25), the big 0.2 ~ 0.5mm of radius of the said inner vertex circular arc of the radius ratio of said outer dead centre circular arc (25) (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220181550 CN202578555U (en) | 2012-04-25 | 2012-04-25 | Special buttress thread oil casing joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220181550 CN202578555U (en) | 2012-04-25 | 2012-04-25 | Special buttress thread oil casing joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202578555U true CN202578555U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220181550 Expired - Fee Related CN202578555U (en) | 2012-04-25 | 2012-04-25 | Special buttress thread oil casing joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202578555U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720439A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-tightness buttress thread sleeve joint |
| CN102720440A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealed BCSG joint |
| 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 |
| CN103321586A (en) * | 2013-07-16 | 2013-09-25 | 无锡西姆莱斯石油专用管制造有限公司 | Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure |
| CN109403877A (en) * | 2018-11-26 | 2019-03-01 | 中国石油大学(北京) | Oil pipe thread connector |
| CN109563951A (en) * | 2016-09-16 | 2019-04-02 | 新日铁住金株式会社 | Nipple |
-
2012
- 2012-04-25 CN CN 201220181550 patent/CN202578555U/en not_active Expired - Fee Related
Cited By (11)
| 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 |
| CN102720439A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-tightness buttress thread sleeve joint |
| CN102720440A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealed BCSG joint |
| CN102720439B (en) * | 2012-06-16 | 2015-09-02 | 无锡西姆莱斯石油专用管制造有限公司 | High sealability BCSG jointing |
| CN102720440B (en) * | 2012-06-16 | 2015-09-02 | 无锡西姆莱斯石油专用管制造有限公司 | High sealability buttress thread casing joint |
| CN103321586A (en) * | 2013-07-16 | 2013-09-25 | 无锡西姆莱斯石油专用管制造有限公司 | Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure |
| CN103321586B (en) * | 2013-07-16 | 2015-04-15 | 无锡西姆莱斯石油专用管制造有限公司 | Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure |
| CN109563951A (en) * | 2016-09-16 | 2019-04-02 | 新日铁住金株式会社 | Nipple |
| CN109563951B (en) * | 2016-09-16 | 2021-09-10 | 日本制铁株式会社 | Threaded joint |
| CN109403877A (en) * | 2018-11-26 | 2019-03-01 | 中国石油大学(北京) | Oil pipe thread connector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140922 Granted publication date: 20121205 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20121205 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| 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: 20121205 Termination date: 20180425 |