CN102852469B - Special buttress thread oil sleeve joint - Google Patents
Special buttress thread oil sleeve joint Download PDFInfo
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- CN102852469B CN102852469B CN201210125088.0A CN201210125088A CN102852469B CN 102852469 B CN102852469 B CN 102852469B CN 201210125088 A CN201210125088 A CN 201210125088A CN 102852469 B CN102852469 B CN 102852469B
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Abstract
The invention relates to a special buttress thread oil sleeve joint which comprises a connection hoop and a tube body. An annular internal footstep column face is arranged on an axially middle portion of an inner wall of the connection hoop, standard buttress internal threads are manufactured at two ends of the connection hoop, wedge-shaped internal threads are arranged at the back end of the buttress internal threads close to the internal footstep column face, standard buttress external threads are manufactured on an outer wall of the end portion of the tube body, wedge-shaped external threads are arranged at the front end of the buttress external threads, and flank angles of the wedge-shaped internal threads and wedge-shaped external threads are negative angles. Wedge-shaped threads are added on end portions of the standard buttress threads of the connection hoop and the tube body, connection strength and teeth-shaped sealing performance of the joint are increased, anti-tripping capability of the joint is improved, an anti-torque ledge is added between the tube end and the connection hoop, and anti-torque performance and anti-compression load performance of the joint are further improved.
Description
Technical field
The present invention relates to the oil well pipe screwed joints being applied to petroleum industry, specifically a kind of special buttress thread oil sleeve joint.
Background technology
Tubing and casing in oil well pipe industry is mainly coupled together by nipple, and form oil casing, length reaches thousands of rice, and requirement of strength, the sealing performance of wherein nipple connection, the requirement of each side such as tensile load and torque resistant performance is higher.
Existing API(American Petroleum Institute (API)) buttress thread joint, the deficiencies such as there is torque resistant performance more weak, bonding strength is low, Anti-collapse ability, make oil well pipe company or oil field seek the more excellent and reliable special thread syndeton of performance gradually.
Summary of the invention
The present invention is directed to the problems referred to above, provide a kind of special buttress thread oil sleeve joint, this joint bonding strength is high, and incompressible load can be strong, and torque resistant performance is high simultaneously.
According to technical scheme of the present invention: a kind of special buttress thread oil sleeve joint, comprise the box cupling and body that are threaded connection, the axis middle part of described box cupling inwall is provided with the interior step cylinder of ring-type, the two ends of described box cupling are processed with the inclined trapezoidal internal thread of standard, described inclined trapezoidal internal thread is provided with wedge shape internal thread near the rear end of described interior step cylinder, the outer wall of described body end is processed with the partially trapezoidal external screw thread of standard, described partially trapezoidal externally threaded front end is provided with wedge shape external screw thread, described wedge shape internal thread and the externally threaded tooth side angle of described wedge shape are negative angle.
The value of described tooth side angle is 5 ° ~ 15 °.Described wedge shape internal thread and the externally threaded tooth number of described wedge shape are 1 ~ 5 tooth.In described box cupling, the end of step cylinder is provided with internal torque shoulder, described internal torque shoulder is provided with recessed interior shoulder angle, described interior shoulder angle chamfering in the outward-dipping formation of described box cupling axis; The end of described body is provided with the outer torque shoulder matched with described internal torque shoulder, described outer torque shoulder is provided with the between outer land fillet degree of protrusion, and described between outer land fillet degree forms outer chamfering near sloping inwardly of described body axis.
Be provided with inner sealing surface between described internal torque shoulder and described wedge shape internal thread, between described outer torque shoulder and described wedge shape external screw thread, be provided with external seal face.The length of described inner sealing surface is equal with the length in described external seal face, is 1.5 ~ 5.0mm.The value of described interior shoulder angle is 90 ° ~ 130 °, and the value of described between outer land fillet degree is than large 0 ~ 2 ° of the value of described interior shoulder angle, and the value of described interior chamfering is 20 ° ~ 50 °, and the value of described outer chamfering is equal with the value of described interior chamfering.Larger than the value of described interior shoulder angle 0.5 ° ~ 1 ° of the value of described between outer land fillet degree.Described outer shoulder thickness is equal with described interior shoulder thickness, is 4 ~ 12mm.
The summit place of described interior shoulder angle is provided with inner vertex circular arc, and the radius of described inner vertex circular arc is 0.5 ~ 2.5mm; The summit place of described between outer land fillet degree is provided with outer dead centre circular arc, the large 0.2 ~ 0.5mm of radius of inner vertex circular arc described in the radius ratio of described outer dead centre circular arc.
Technique effect of the present invention is: the present invention adds wedge thread in the end of the standard buttress thread of box cupling and body, adds bonding strength and the profile of tooth sealing performance of joint, improves the anti-tripping ability of joint; In the middle of pipe end and box cupling, add torque resistant shoulder, further increase the torque resistant performance of joint and incompressible load performance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation after the present invention decomposes.
Fig. 3 is the tooth form figure of the wedge thread in the present invention.
Fig. 4 is the enlarged drawing of the internal torque shoulder in the present invention.
Fig. 5 is the enlarged drawing of the outer torque shoulder in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
In Fig. 1 ~ Fig. 5, comprise box cupling 1, body 2, inclined trapezoidal internal thread 3, partially trapezoidal 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, step plane 10 in box cupling, tapering 11, pitch 12, tooth depth 13, profile of tooth tooth is wide by 14, profile of tooth groove width 15, tooth side angle 16, profile of tooth circular arc 17, interior shoulder thickness 18, outer shoulder thickness 19, interior shoulder apex angle 20, outer shoulder apex 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.
As shown in Figure 1 and Figure 2, the present invention is a kind of special buttress thread oil sleeve joint, comprise the box cupling 1 and body 2,28 that are threaded connection, box cupling 1 and body 2,28 are for benchmark with virtual middle line 9, screw with internal and external threads, undertaken somely being connected to form oil, casing string by box cupling 1 with body 2 and body 28, meet the requirement of oil gas field production and application.
The axis middle part of box cupling 1 inwall is provided with the interior step cylinder 10 of ring-type, and in box cupling, the length range of step cylinder 10 is 50 ~ 200mm, increases bonding strength and the bending resistance of joint.The two ends of box cupling 1 are processed with the inclined trapezoidal internal thread 3 of standard, and inclined trapezoidal internal thread 3 is provided with wedge shape internal thread 5 near the rear end of interior step cylinder 10.The outer wall of body 2,28 end is processed with the partially trapezoidal external screw thread 4 of standard, the front end of partially trapezoidal external screw thread 4 is provided with wedge shape external screw thread 6.Inclined trapezoidal internal thread 3 adopts API standard with partially trapezoidal external screw thread 4.
As shown in Figure 3, wedge shape internal thread 5 is 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 and the tapering 11 of wedge shape external screw thread 6 are 1:16, pitch 12 is that 5.08mm and API standard is identical, and tooth depth 13 is 1.00mm ~ 1.43mm, profile of tooth tooth wide 14 is 1.50mm ~ 2.07mm, profile of tooth groove width 15 is 2.55mm ~ 3.03mm, profile of tooth circular arc 17 radius is 0.10mm ~ 0.50mm.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 to during wedge thread deformable transition, transition face length can not be greater than 1 pitch, and the distance length of the tooth number total length of its wedge shape external screw thread 6 pitch more individual than the tooth number total length large (0.3 ~ 1) of wedge shape internal thread 5, the best is the distance of 0.5 tooth, ensures that it leaves enough surpluses when coordinating and can not interfere like this.
As shown in Figure 4, in box cupling 1, the end of step cylinder 10 is provided with internal torque shoulder 7, internal torque shoulder 7 is provided with recessed interior shoulder angle 20, interior shoulder angle 20 chamfering 22 in the outward-dipping formation 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 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 summit place 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 matched with internal torque shoulder 7, outer torque shoulder 8 is provided with the between outer land fillet degree 21 of protrusion, and between outer land fillet degree 21 forms outer chamfering 23 near sloping inwardly of body 2,28 axis.Larger than the value of interior shoulder angle 20 0 ~ 2 ° of the value of between outer land fillet degree 21, preferably large 0.5 ° ~ 1 °.The value of outer chamfering 23 is equal with the value of interior chamfering 22.Be provided with external seal face 27 between outer torque shoulder 8 and wedge shape external screw thread 6, the length in external seal face 27 is equal with the length of inner sealing surface 26, and outer shoulder thickness 19 is equal with interior shoulder thickness 18.The summit place of between outer land fillet degree 21 is provided with outer dead centre circular arc 25, the large 0.2 ~ 0.5mm of radius of the radius ratio inner vertex circular arc 24 of outer dead centre circular arc 25.
When the present invention operates, any one end of box cupling 1 is first inserted on body 2, the external screw thread of the internal thread of box cupling 1 and body 2 first should be inserted in 3 ~ 7 when being inserted in detain, should be light and slow during hitch, by internal and external threads make-up then manpower screw-in, with manpower screw motionless be till, the hand-tight box cupling 1 that spins together and body 2 petroleum pipeline screw-on machine device are carried out further machine and twist and access machine and twist interference fit state when connecing.
When box cupling 1 and body 2 are after machine is twisted and taken over and be full of and screw and coordinate, its wedge shape internal thread 5, wedge shape external screw thread 6 reach interference fits state and form certain sealing, simultaneously, shoulder thickness 18 and outer shoulder thickness 19 reach interference fit, because the shoulder thickness both it and tooth depth spigot surface are in same plane, contact surface is comparatively large, considerably increases the ability of its high resistance torsional performance and compressive load ability and tensile load.The position that machine is tight and torque can be made separate stipulations according to API standard operation or technical papers, but must meet interior shoulder thickness 18 must not have any gap with outer shoulder thickness 19 after machine tightly screws.Its box cupling 1 and body 28 are closely cooperate for benchmark with virtual middle line 9 by same fastening method, reach that body 28 and body 2 are undertaken somely being connected to form oil by box cupling 1, casing string meets the requirement of oil gas field production and application.When going into the well in oil field, its connector machine stressed joint is one by one formed the oil casing of thousands of meters.
The present invention adds wedge thread in the end of the standard buttress thread of box cupling 1 and body 2,28, adds bonding strength and the profile of tooth sealing performance of joint, improves the anti-tripping ability of joint; In the middle of pipe end and box cupling, add torque resistant shoulder, further increase the torque resistant performance of joint and incompressible load performance; Add the overall length of box cupling, improve bonding strength and the bending resistance of joint.
The present invention processes simple and convenient, and the scope of application is wide, safe and reliable; The power can bearing extraneous high strength complexity applies and does not reveal or damage, and meets the instructions for use in oil field.
Claims (1)
1. a special buttress thread oil sleeve joint, comprise the box cupling (1) and body (2 that are threaded connection, 28), the axis middle part of described box cupling (1) inwall is provided with the interior step cylinder (10) of ring-type, it is characterized in that: the two ends of described box cupling (1) are processed with the inclined trapezoidal internal thread of standard (3), described inclined trapezoidal internal thread (3) is provided with wedge shape internal thread (5) near the rear end of described interior step cylinder (10), described body (2, 28) outer wall of end is processed with the partially trapezoidal external screw thread (4) of standard, the front end of described partially trapezoidal external screw thread (4) is provided with wedge shape external screw thread (6), described wedge shape internal thread (5) is negative angle with the tooth side angle (16) of described wedge shape external screw thread (6),
The value of described tooth side angle (16) is 5 ° ~ 15 °;
Described wedge shape internal thread (5) is 1 ~ 5 tooth with the tooth number of described wedge shape external screw thread (6);
The end of the interior step cylinder (10) of described box cupling (1) is provided with internal torque shoulder (7), described internal torque shoulder (7) is provided with recessed interior shoulder angle (20), described interior shoulder angle (20) chamfering (22) in the outward-dipping formation of described box cupling (1) axis; The end of described body (2,28) is provided with the outer torque shoulder (8) matched with described internal torque shoulder (7), described outer torque shoulder (8) is provided with the between outer land fillet degree (21) of protrusion, described between outer land fillet degree (21) forms outer chamfering (23) near sloping inwardly of described body (2,28) axis;
Be provided with inner sealing surface (26) between described internal torque shoulder (7) and described wedge shape internal thread (5), between described outer torque shoulder (8) and described wedge shape external screw thread (6), be provided with external seal face (27);
The length of described inner sealing surface (26) is equal with the length of described external seal face (27), is 1.5 ~ 5.0mm;
The value of described interior shoulder angle (20) is 90 ° ~ 130 °, the value of described between outer land fillet degree (21) is than large 0 ~ 2 ° of the value of described interior shoulder angle (20), the value of described interior chamfering (22) is 20 ° ~ 50 °, and the value of described outer chamfering (23) is equal with the value of described interior chamfering (22);
The value of described between outer land fillet degree (21) is than large 0.5 ° ~ 1 ° of the value of described interior shoulder angle (20);
Described outer shoulder thickness (19) is equal with described interior shoulder thickness (18), is 4 ~ 12mm;
The summit place of described interior shoulder angle (20) is provided with inner vertex circular arc (24), and the radius of described inner vertex circular arc (24) is 0.5 ~ 2.5mm; The summit place of described between outer land fillet degree (21) is provided with outer dead centre circular arc (25), the large 0.2 ~ 0.5mm of radius of inner vertex circular arc (24) described in the radius ratio of described outer dead centre circular arc (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125088.0A CN102852469B (en) | 2012-04-25 | 2012-04-25 | Special buttress thread oil sleeve joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125088.0A CN102852469B (en) | 2012-04-25 | 2012-04-25 | Special buttress thread oil sleeve joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102852469A CN102852469A (en) | 2013-01-02 |
| CN102852469B true CN102852469B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210125088.0A Expired - Fee Related CN102852469B (en) | 2012-04-25 | 2012-04-25 | Special buttress thread oil sleeve joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102852469B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5137310A (en) * | 1990-11-27 | 1992-08-11 | Vallourec Industries | Assembly arrangement using frustoconical screwthreads for tubes |
| US5689871A (en) * | 1982-05-19 | 1997-11-25 | Carstensen; Kenneth J. | Couplings for standard A.P.I. tubings and casings and methods of assembling the same |
| CN2670580Y (en) * | 2003-07-18 | 2005-01-12 | 无锡西姆莱斯石油专用管制造有限公司 | Buttress thread oil pipe connector |
| CN2700542Y (en) * | 2004-06-10 | 2005-05-18 | 无锡西姆莱斯石油专用管制造有限公司 | Special casing joint for thermal production well |
| CN200946463Y (en) * | 2006-06-08 | 2007-09-12 | 天津钢管集团有限公司 | Spiral seal type sleeve connection structure |
| CN101975034A (en) * | 2010-10-18 | 2011-02-16 | 西安交通大学 | Hermetic seal connecting structure for special buckle of oil casing |
| CN201810223U (en) * | 2010-08-26 | 2011-04-27 | 无锡西姆莱斯石油专用管制造有限公司 | Buttress thread sleeve joint |
| CN202578555U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil casing joint |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL195714B1 (en) * | 2000-06-20 | 2007-10-31 | Sumitomo Metal Ind | Tubular threaded joint with reinforced stop |
| US7686350B2 (en) * | 2006-03-30 | 2010-03-30 | Hydril Llc | Mismatched flanks for a wedge thread |
-
2012
- 2012-04-25 CN CN201210125088.0A patent/CN102852469B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5689871A (en) * | 1982-05-19 | 1997-11-25 | Carstensen; Kenneth J. | Couplings for standard A.P.I. tubings and casings and methods of assembling the same |
| US5137310A (en) * | 1990-11-27 | 1992-08-11 | Vallourec Industries | Assembly arrangement using frustoconical screwthreads for tubes |
| CN2670580Y (en) * | 2003-07-18 | 2005-01-12 | 无锡西姆莱斯石油专用管制造有限公司 | Buttress thread oil pipe connector |
| CN2700542Y (en) * | 2004-06-10 | 2005-05-18 | 无锡西姆莱斯石油专用管制造有限公司 | Special casing joint for thermal production well |
| CN200946463Y (en) * | 2006-06-08 | 2007-09-12 | 天津钢管集团有限公司 | Spiral seal type sleeve connection structure |
| CN201810223U (en) * | 2010-08-26 | 2011-04-27 | 无锡西姆莱斯石油专用管制造有限公司 | Buttress thread sleeve joint |
| CN101975034A (en) * | 2010-10-18 | 2011-02-16 | 西安交通大学 | Hermetic seal connecting structure for special buckle of oil casing |
| CN202578555U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil casing joint |
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| Publication number | Publication date |
|---|---|
| CN102852469A (en) | 2013-01-02 |
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| CF01 | Termination of patent right due to non-payment of annual fee |