CN102720440B - High sealability buttress thread casing joint - Google Patents
High sealability buttress thread casing joint Download PDFInfo
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- CN102720440B CN102720440B CN201210199144.5A CN201210199144A CN102720440B CN 102720440 B CN102720440 B CN 102720440B CN 201210199144 A CN201210199144 A CN 201210199144A CN 102720440 B CN102720440 B CN 102720440B
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- box cupling
- thread
- wedge shape
- step cylinder
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Abstract
The present invention relates to a kind of high sealability buttress thread casing joint, comprise box cupling and body, the middle part of box cupling is provided with interior step cylinder; The two ends of box cupling are processed with the inclined trapezoidal internal thread of standard, and the rear end of inclined trapezoidal internal thread is provided with wedge shape internal thread, and body end is processed with the partially trapezoidal external screw thread of standard, and partially trapezoidal externally threaded front end is provided with wedge shape external screw thread; Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of interior step cylinder and the end of body, shape metallic leak-proof structure comprises the inner seal structure be arranged on box cupling and the outer seal configuration be arranged on body; Inner seal structure comprises the groove of inner sealing surface and interior step cylinder end face; Outer seal configuration comprises the projection of external seal face and body end face.The present invention adds wedge thread and on-plane surface shoulder hermetically-sealed construction in the end of standard buttress thread, add the bonding strength of joint, sealing performance, bending resistance, incompressible load-carrying ability and torque resistant performance.
Description
Technical field
The present invention relates to the oil well pipe screwed joints being applied to petroleum industry, specifically a kind of high sealability buttress thread casing joint.
Background technology
Tubing and casing in oil well pipe industry is mainly coupled together by nipple, form oil casing, length reaches thousands of rice, and wherein the quality of the bonding strength of nipple, sealing performance, bending resistance, the performance such as torque resistant performance and tensile load directly affects the quality of connection of oil well pipe.Different geologic structures needs the oil well pipe of the different forms that is threaded, to meet instructions for use.
Along with the development of oilfield exploitation, more and more stricter to the requirement of oil well pipe screwed joints, particularly require more and more higher to the relevant main performance index of oil well pipe.Existing API(American Petroleum Institute (API)) buttress thread joint, the deficiencies such as there is torque resistant performance more weak, bonding strength is low, poor sealing performance, Anti-collapse ability.Each oil well pipe processing enterprise of world new designs of threaded joints is constantly innovated, and has occurred different helicitic texture types of attachment, but still can not meet the instructions for use of oilfield exploitation.
Summary of the invention
The present invention is directed to the problems referred to above, provide a kind of high sealability buttress thread casing joint, this joint bonding strength is high, good seal performance, and incompressible load can be strong, and torque resistant performance is high simultaneously.
According to technical scheme of the present invention: a kind of high sealability buttress thread casing 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, and described wedge shape internal thread and the externally threaded tooth side angle of described wedge shape are negative angle; Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of described interior step cylinder and the end of described body, described shape metallic leak-proof structure comprises the inner seal structure be arranged on described box cupling and the outer seal configuration be arranged on described body; Described inner seal structure comprises the inner sealing surface be arranged between described interior step cylinder end face and described coupling inner thread end, and the radial middle part of the end face of described interior step cylinder inwardly concaves formation groove; Described outer seal configuration comprises the external seal face be arranged on the outer wall of described body end, and the outwardly formation in radial middle part of described body end face is protruding.
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.
The acute angle formed between one side of described interior step cylinder facing groove and described box cupling axis is inner sealing surface chamfering, the value of described inner sealing surface chamfering is 10 ° ~ 30 °, the acute angle formed between its another side and described box cupling radial direction is interior shoulder bevel, and the value of described Inner shoulder bevel is 8 ° ~ 35 °; The acute angle formed between one side of described body head face hump and the axis of described body is external seal surface chamfer, described external seal surface chamfer is identical with the value of described inner sealing surface chamfering, the acute angle formed between its another side and described body radial direction is outer shoulder bevel, and described outer shoulder bevel is less than described Inner shoulder bevel 0 ~ 2 °.
The summit place of described interior step cylinder facing groove is provided with inner vertex circular arc, and the radius of described inner vertex circular arc is 0.20 ~ 1.2mm; The summit place of described body head face hump is provided with outer dead centre circular arc, the large 0 ~ 0.5mm of radius of inner vertex circular arc described in the radius ratio of described outer dead centre circular arc.
The length of described inner sealing surface is 4 ~ 10mm, the length half pitch longer than the length of described inner sealing surface in described external seal face.
The interior shoulder thickness of described inner seal structure is 4 ~ 10mm, and the outer shoulder thickness of described outer seal configuration is equal with described interior shoulder thickness.
The inwall of described body end is provided with inner cylinder face, and described inner cylinder face is connected by the endoporus of the transition conical surface with described body, and the length of described inner cylinder face is 5 ~ 20mm.
Technique effect of the present invention is: the present invention adds the on-plane surface shoulder hermetically-sealed construction of wedge thread and metal and metal in the end of standard buttress thread, add the bonding strength of joint, sealing performance, bending resistance, incompressible load-carrying ability and torque resistant 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 shape in the present invention.
Fig. 4 is the enlarged drawing of the inner seal structure in the present invention.
Fig. 5 is the enlarged drawing of the outer seal configuration 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, inner seal structure 7, outer seal configuration 8, middle line 9, interior shoulder cylinder 10, tapering 11, pitch 12, tooth depth 13, flute profile tooth is wide by 14, flute profile groove width 15, tooth side angle 16, flute profile circular arc 17, inner sealing surface 18, external seal face 19, inner sealing surface chamfering length 20, external seal surface chamfer length 21, interior shoulder thickness 22, outer shoulder thickness 23, inner vertex circular arc 24, outer dead centre circular arc 25, inner sealing surface chamfering 26, external seal surface chamfer 27, interior shoulder bevel 28, outer shoulder bevel 29, inner cylinder face 30, the transition conical surface 31, body 32 etc.
As shown in Figure 1 and Figure 2, the present invention is a kind of high sealability buttress thread casing joint, comprise the box cupling 1 and body 2,32 that are threaded connection, box cupling 1 and body 2,32 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 34, 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.The length range of interior step cylinder 10 is 50 ~ 200mm, can increase 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 2,32 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 different from from the measure-alike tolerance of wedge shape external screw thread 6 seal request reached during interference fits.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 5.08mm, and its tapering, pitch are identical with API standard, when wedge thread screws, screw freely under the guiding of buttress thread, and any interference can not occur.Wedge shape internal thread 5 and the tooth depth 13 of wedge shape external screw thread 6 are 1.00mm ~ 1.43mm, flute profile tooth wide 14 is 1.50mm ~ 2.07mm, flute profile groove width 15 is 2.55mm ~ 3.03mm, flute profile circular arc 17 radius is 0.40mm ~ 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 transition deformation, and transition face length can not more than the length of 1 pitch.The total length of buttress thread and wedge thread can by reducing or increase buttress thread tooth number, also the total length requirement of body 2,32 end processing is met by reducing or increase wedge thread tooth number, but its tooth number increasing or reduce can not more than 4 teeth, and the processing of its box cupling 1 screw thread is identical.
Again see Fig. 1 and Fig. 2, in box cupling 1, be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of step cylinder 10 and the end of body 2,32.Shape metallic leak-proof structure comprises the inner seal structure 7 be arranged on box cupling 1 and the outer seal configuration 8 be arranged on body 2,32.
As shown in Figure 4, inner seal structure 7 comprises the inner sealing surface 18 be arranged between interior step cylinder 10 end face and box cupling 1 internal threaded end, and the length of inner sealing surface 18 is 4 ~ 10mm, and the interior shoulder thickness 22 of inner seal structure 7 is 4 ~ 10mm.The radial middle part of the end face of interior step cylinder 10 inwardly concaves formation groove, the acute angle formed between one side of groove and box cupling 1 axis is inner sealing surface chamfering 26, the value of inner sealing surface chamfering 26 is 10 ° ~ 30 °, the acute angle formed between its another side and box cupling 1 radial direction is the value of interior shoulder bevel 28, Inner shoulder bevel 28 is 8 ° ~ 35 °.The summit place of interior step cylinder 10 facing groove is provided with inner vertex circular arc 24, and the radius of inner vertex circular arc 24 is 0.20 ~ 1.2mm.
As shown in Figure 5, outer seal configuration 8 comprises the external seal face 19 be arranged on body 2,32 end outer wall, the length half pitch longer than the length of inner sealing surface 18 in external seal face 19, does not interfere with wedge shape external screw thread 6 closely cooperating under high pulling torque to meet wedge shape internal thread 5.The outer shoulder thickness 23 of outer seal configuration 8 is equal with interior shoulder thickness 22, with meet its closely cooperate after in same plane, oil gas turbulent phenomenon in body can not be caused, reach and smoothly pass through smoothly.The outwardly formation in radial middle part of body 2,32 end face is protruding, the acute angle formed between protruding one side and the axis of body 2,32 is external seal surface chamfer 27, external seal surface chamfer 27 is identical with the value of inner sealing surface chamfering 26, the acute angle formed between its another side and body 2,32 radial direction is outer shoulder bevel 29, outer shoulder bevel 29 is less than Inner shoulder bevel 28 0 ~ 2 °, with 0.5 ° ~ 1 ° the best, meet the state of plastic deformation that inside and outside shoulder causes in the tight situation of machine and be issued to interference fit state.The summit place of body 2,32 head face hump is provided with outer dead centre circular arc 25, large 0 ~ the 0.5mm of radius of the radius ratio inner vertex circular arc 24 of outer dead centre circular arc 25,, to meet inside and outside shoulder under the tight state of machine, when inside and outside circular arc coordinates, cause state of plastic deformation to be issued to interference fit state.The inwall of body 2,32 end is provided with inner cylinder face 30, inner cylinder face 30 is connected with the endoporus of body 2,32 by the transition conical surface 31, the length of inner cylinder face 30 is 5 ~ 20mm, the transition conical surface 31 length does not do requirement, the length of its inner cylinder face 30 and the transition conical surface 31 can specify according to body 2,32 wall thickness, can keep same plane with interior step cylinder 10 and seamlessly transit after closely cooperate.
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 by outer external screw thread make-up then manpower screw-in during hitch, 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 buttress thread screw guiding under, smoothly can screw in pairing and reach the sealing that interference fits state type becomes certain, wedge thread can significantly increase its bonding strength and bending resistance, its wedge thread flute profile has high sealing performance, the high composite bearing ability of effective raising nipple, can provide suitable with body in press drag; Simultaneously, shoulder thickness 22, outer shoulder thickness 23 reach interference fit, considerably increase the ability of its high resistance torsional performance and compressive load ability and tensile load.Inner sealing surface 18 forms radial interference fit with the external diameter in both external seal faces 19 simultaneously, greatly increases the sealing performance that it coordinates, makes joint have multi-sealing structure, effectively improves the high composite bearing ability of nipple; 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 22, outer shoulder thickness 23 must not have any gap after machine tightly screws.Its box cupling 1 and body 32 are closely cooperate for benchmark with virtual middle line 9 by same fastening method, reach that body 32 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 hermetically-sealed construction in the end of standard buttress thread, wedge thread significantly can increase bonding strength and the bending resistance of joint, its wedge type thread tooth type has high sealing performance, the high composite bearing ability of effective raising nipple, can provide suitable with body in press drag, wedge type screw thread effectively improves anti-tripping performance and the tensile load performance of nipple; The present invention have employed the on-plane surface shoulder hermetically-sealed construction of metal and metal simultaneously, reaches the multi-sealing structure of nipple, considerably increases incompressible load-carrying ability and torque resistant performance and high sealing performance.The present invention is applicable to deep-well, ultradeep well, high pressure oil wells and high-pressure gas well and uses very much.
Claims (1)
1. a high sealability buttress thread casing joint, comprises the box cupling (1) and body (2,32) that are threaded connection, and 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), the inclined trapezoidal internal thread of described standard (3) is provided with wedge shape internal thread (5) near the rear end of described interior step cylinder (10), the outer wall of described body (2,32) end is processed with the partially trapezoidal external screw thread (4) of standard, the front end of the partially trapezoidal external screw thread (4) of described standard is provided with wedge shape external screw thread (6), and described wedge shape internal thread (5) is negative angle with the tooth side angle (16) of described wedge shape external screw thread (6); Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of described interior step cylinder (10) and the end of described body (2,32), described shape metallic leak-proof structure comprises the inner seal structure (7) be arranged on described box cupling (1) and the outer seal configuration (8) be arranged on described body (2,32); Described inner seal structure (7) comprises the inner sealing surface (18) be arranged between described interior step cylinder (10) end face and described box cupling (1) internal threaded end, and the radial middle part of the end face of described interior step cylinder (10) inwardly concaves formation groove; Described outer seal configuration (8) comprises the external seal face (19) be arranged on described body (2,32) end outer wall, and the outwardly formation in radial middle part of described body (2,32) end face is protruding;
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);
Described interior step cylinder (10) facing groove while and the acute angle formed between described box cupling (1) axis be inner sealing surface chamfering (26), the value of described inner sealing surface chamfering (26) is 10 ° ~ 30 °, the acute angle formed between its another side and described box cupling (1) radial direction is interior shoulder bevel (28), and the value of described interior shoulder bevel (28) is 8 ° ~ 35 °; Described body (2,32) head face hump while and the acute angle formed between the axis of described body (2,32) be external seal surface chamfer (27), described external seal surface chamfer (27) is identical with the value of described inner sealing surface chamfering (26), the acute angle formed between its another side and described body (2,32) radial direction is outer shoulder bevel (29), and described outer shoulder bevel (29) is less 0 ~ 2 ° than described interior shoulder bevel (28);
The summit place of described interior step cylinder (10) facing groove is provided with inner vertex circular arc (24), and the radius of described inner vertex circular arc (24) is 0.20 ~ 1.2mm; The summit place of described body (2,32) head face hump is provided with outer dead centre circular arc (25), the large 0 ~ 0.5mm of radius of inner vertex circular arc (24) described in the radius ratio of described outer dead centre circular arc (25);
The length of described inner sealing surface (18) is 4 ~ 10mm, the length half pitch longer than the length of described inner sealing surface (18) of described external seal face (19);
The interior shoulder thickness (22) of described inner seal structure (7) is 4 ~ 10mm, and the outer shoulder thickness (23) of described outer seal configuration (8) is equal with described interior shoulder thickness (22);
The inwall of described body (2,32) end is provided with inner cylinder face (30), and described inner cylinder face (30) is connected by the endoporus of the transition conical surface (31) with described body (2,32), and the length of described inner cylinder face (30) is 5 ~ 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199144.5A CN102720440B (en) | 2012-06-16 | 2012-06-16 | High sealability buttress thread casing joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199144.5A CN102720440B (en) | 2012-06-16 | 2012-06-16 | High sealability buttress thread casing joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102720440A CN102720440A (en) | 2012-10-10 |
| CN102720440B true CN102720440B (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210199144.5A Expired - Fee Related CN102720440B (en) | 2012-06-16 | 2012-06-16 | High sealability buttress thread casing joint |
Country Status (1)
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| CN (1) | CN102720440B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868658A (en) * | 2018-06-28 | 2018-11-23 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection with multi-sealed face screw thread positive-angle |
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| CN102720440A (en) | 2012-10-10 |
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