CN102720440A - High-sealed BCSG joint - Google Patents
High-sealed BCSG joint Download PDFInfo
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- CN102720440A CN102720440A CN2012101991445A CN201210199144A CN102720440A CN 102720440 A CN102720440 A CN 102720440A CN 2012101991445 A CN2012101991445 A CN 2012101991445A CN 201210199144 A CN201210199144 A CN 201210199144A CN 102720440 A CN102720440 A CN 102720440A
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- sealing surface
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- 238000007789 sealing Methods 0.000 claims abstract description 38
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000001154 acute effect Effects 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 239000003129 oil well Substances 0.000 description 8
- 210000002445 nipple Anatomy 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
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Abstract
The invention relates to a high-sealed BCSG joint which comprises a coupling and a pipe body, wherein the middle part of the coupling is provided with an internal step cylindrical surface; two ends of the coupling are provided with standard buttress internal threads; the rear ends of the buttress internal threads are provided with wedge-shaped internal threads; the end part of the pipe body is provided with standard buttress external threads; the front ends of the buttress external threads are provided with wedge-shaped external threads; metal seal structures are respectively arranged between the two end surfaces of the internal step cylindrical surface and the end part of the pipe body; each metal seal structure comprises an internal seal structure arranged on the coupling and an external seal structure arranged on the pipe body; each internal seal structure comprises an internal seal surface and a groove at the end surface of the internal step cylindrical surface; each external seal structure comprises an external seal surface and a bulge at the end surface of the pipe body. According to the high-sealed BCSG joint, the wedge-shaped threads and the non-planar shoulder seal structures are additionally arranged at the end parts of the standard buttress threads, so that the connection strength, the sealing property, the bend resistance, the compression load resistance and the torque-resisting performance of the joint are enhanced.
Description
Technical field
The present invention relates to be applied to the oil well pipe thread joint of petroleum industry, specifically a kind of high sealability BCSG joint.
Background technology
Tubing and casing in the oil well pipe industry mainly is to couple together through nipple; Form oil casing; Length reaches thousands of rice, and wherein the quality of performances such as the bonding strength of nipple, sealing performance, counter-bending ability, torque resistant performance and tensile load directly affects the quality of connection of oil well pipe.The different geological structure needs the oil well pipe of the different forms that is threaded, to satisfy instructions for use.
Along with the continuous development of oilfield exploitation, more and more stricter to the requirement of oil well pipe thread joint, particularly the relevant main performance index to oil well pipe requires increasingly high.Existing API (American Petroleum Institute (API)) buttress thread joint, exist the torque resistant performance a little less than, bonding strength is low, poor sealing performance, the anti-deficiencies such as ruining ability of squeezing.Each oil well pipe processing enterprise new designs of threaded joints of the world is constantly innovated, and different helicitic texture types of attachment occurred, but still can not satisfy the instructions for use of oilfield exploitation.
Summary of the invention
The present invention is directed to the problems referred to above, a kind of high sealability BCSG joint is provided, this joint bonding strength is high, good seal performance, and incompressible load can be strong, and the torque resistant performance is high simultaneously.
According to technical scheme of the present invention: a kind of high sealability BCSG 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; 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; Be 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; Be respectively arranged with shape metallic leak-proof structure between the end of both ends of the surface and the said body of step cylinder in said, said shape metallic leak-proof structure comprises and is arranged on the inner seal structure on the said box cupling and is arranged on the outer seal configuration on the said body; Said inner seal structure comprises the inner sealing surface that is arranged between said interior step cylinder end face and the said box cupling internal threaded end, and the radially middle part of the end face of said interior step cylinder inwardly concaves the formation groove; Said outer seal configuration comprises the external seal face that is arranged on the outer wall of said body end, and the radially middle part of said body end face outwards protrusion forms protruding.
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.
Stepped cylindrical recess of the inner side of the end face of the coupling and the acute angle formed between the axis of the inner sealing surface of the chamfer, said inner sealing surface of the chamfer is 10 ° ~ 30 °, which on the other side with the access hoop acute angle formed between the radial inner shoulder chamfered, said chamfered inner shoulder is 8 ° ~ 35 °; said convex side of the tube end of the tube body is formed between the axis The acute angle of the outer sealing surface of the chamfer, said outer sealing surface of said inner sealing surface of the chamfer chamfer the same value, which the other side of the tube at an acute angle formed between the radially outer shoulder of the chamfer, the outer chamfered shoulder shoulder than the inner chamfer small 0 ~ 2 °.
Place, the summit of step cylinder end face groove is provided with the inner vertex circular arc in said, and the radius of said inner vertex circular arc is 0.20 ~ 1.2mm; The protruding place, summit of said body end face is provided with outer dead centre circular arc, the big 0 ~ 0.5mm of radius of the said inner vertex circular arc of the radius ratio of said outer dead centre circular arc.
The length of said inner sealing surface is 4 ~ 10mm, and the length of said external seal face is than the long half pitch of length of said inner sealing surface.
The interior shoulder thickness of said inner seal structure is 4 ~ 10mm, and the outer shoulder thickness of said outer seal configuration equates with said interior shoulder thickness.
The inwall of said body end is provided with inner cylinder face, and said inner cylinder face links to each other with the endoporus of said body through the transition conical surface, and the length of said inner cylinder face is 5 ~ 20mm.
Technique effect of the present invention is: the present invention has increased the on-plane surface shoulder hermetically-sealed construction of wedge thread and metal and metal in the end of standard buttress thread, has increased bonding strength, sealing performance, counter-bending ability, incompressible load-carrying ability and the torque resistant performance of joint.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of the present invention after decomposing.
Fig. 3 is the tooth form figure of the wedge shape among the present invention.
Fig. 4 is the enlarged drawing of the inner seal structure among the present invention.
Fig. 5 is the enlarged drawing of the outer seal configuration among the present invention.
The specific embodiment
Be further described below in conjunction with the accompanying drawing specific embodiments of the invention.
Among Fig. 1 ~ Fig. 5; Comprise box cupling 1, body 2, wide by 14, the flute profile groove width 15 of trapezoidal internal thread 3, trapezoidal partially 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, 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 partially, the transition conical surface 31, body 32 etc.
Like Fig. 1, shown in Figure 2; The present invention is a kind of high sealability BCSG joint; Comprise box cupling 1 and body 2,32 through being threaded, box cupling 1 and body the 2, the 32nd 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 34 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.The length range of interior step cylinder 10 is 50 ~ 200mm, can increase 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 2,32 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, the different seal requests when reaching interference fits of wedge shape internal thread 5 with wedge shape external screw thread 6 measure-alike tolerances.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 be that 1:16, pitch 12 are 5.08mm with the tapering 11 of wedge shape external screw thread 6, and its tapering, pitch are identical with the API standard, when wedge thread screws, under the guiding of buttress thread, screw freely, any interference can not take place.Wedge shape internal thread 5 is 0.40mm ~ 0.50mm for 1.50mm ~ 2.07mm, flute profile groove width 15 for 2.55mm ~ 3.03mm, flute profile circular arc 17 radiuses for 1.00mm ~ 1.43mm, flute profile tooth wide 14 with the tooth depth 13 of wedge shape external screw thread 6.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 the wedge thread transition is out of shape, and transition face length can not surpass the length of 1 pitch.The total length of buttress thread and wedge thread can be through reducing or increase buttress thread tooth number; Also can be through reducing or increase the total length requirement that wedge thread tooth number satisfies the processing of body 2,32 ends; But the tooth number of its increase or minimizing can not surpass 4 teeth, and the processing of its box cupling 1 screw thread is identical.
Referring to Fig. 1 and Fig. 2, in box cupling 1, be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of step cylinder 10 and body 2,32 again.Shape metallic leak-proof structure comprises the inner seal structure 7 that is arranged on the box cupling 1 and is arranged on the outer seal configuration 8 on the body 2,32.
As shown in Figure 4, inner seal structure 7 comprises the inner sealing surface 18 that is arranged between interior step cylinder 10 end faces 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 radially middle part of the end face of interior step cylinder 10 inwardly concaves the formation groove; The acute angle that forms between one side of groove and box cupling 1 axis is an inner sealing surface chamfering 26; The value of inner sealing surface chamfering 26 is 10 ° ~ 30 °; The acute angle that its another side and box cupling 1 form between radially is interior shoulder bevel 28, and the value of interior shoulder bevel 28 is 8 ° ~ 35 °.The place, summit of interior step cylinder 10 end face grooves 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 that is arranged on body 2, the 32 end outer walls; The length of external seal face 19 does not interfere with wedge shape external screw thread 6 closely cooperating under high pulling torque to satisfy wedge shape internal thread 5 than the long half pitch of length of inner sealing surface 18.The outer shoulder thickness 23 of outer seal configuration 8 equates with interior shoulder thickness 22, to satisfy its back that closely cooperates on same plane, can not cause oil gas turbulent phenomenon in body, reaches smoothly and passes through smoothly.The radially middle part of body 2,32 end faces outwards protrusion forms protruding; The acute angle that forms between the protruding one side and the axis of body 2,32 is an external seal surface chamfer 27; External seal surface chamfer 27 is identical with the value of inner sealing surface chamfering 26; The acute angle that its another side and body 2,32 form between radially is outer shoulder bevel 29; Outer shoulder bevel 29 is littler 0 ~ 2 ° than interior shoulder bevel 28, with 0.5 ° ~ 1 ° the best, satisfies the state of plastic deformation that inside and outside shoulder causes and be issued to the interference fit state under the tight situation of machine.The protruding place, summit of body 2,32 end faces is provided with outer dead centre circular arc 25; Big 0 ~ the 0.5mm of radius of the radius ratio inner vertex circular arc 24 of outer dead centre circular arc 25;, to satisfy inside and outside shoulder under the tight state of machine, inside and outside circular arc causes state of plastic deformation to be issued to the interference fit state when cooperating.The inwall of body 2,32 ends is provided with inner cylinder face 30; Inner cylinder face 30 links to each other through the endoporus of the transition conical surface 31 with body 2,32; The length of inner cylinder face 30 is 5 ~ 20mm; The transition conical surface 31 length are not done requirement, and the length of its inner cylinder face 30 and the transition conical surface 31 can be stipulated according to body 2,32 wall thickness, makes it after closely cooperating, can keep same plane and seamlessly transit getting final product with interior step cylinder 10.
When the present invention operates; 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 outer external screw thread 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 screw under the guiding buttress thread; Can be smooth the screw-in pairing reach the interference fits state type and become certain sealing, wedge thread can significantly increase its bonding strength and counter-bending ability, its wedge thread flute profile has high sealing performance; Effectively improve the high composite bearing ability of nipple, the interior pressure drag suitable with body can be provided; Shoulder thickness 22, outer shoulder thickness 23 have reached interference fit simultaneously, have increased the ability of its high torque resistant performance and compressive load ability and tensile load greatly.Simultaneously both external diameters of inner sealing surface 18 and external seal face 19 form radial interference fit, increase the sealing performance of its cooperation greatly, make joint have multi-sealing structure, effectively improve the high composite bearing ability of nipple; Position that machine is tight and torque can be made separate stipulations according to API standard operation or technical papers, but shoulder thickness 22, outer shoulder thickness 23 must not have any gap 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 32, reach body 32 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 present invention has increased the wedge thread hermetically-sealed construction in the end of standard buttress thread; Wedge thread can significantly increase the bonding strength and the counter-bending ability of joint; Its wedge type thread tooth type has high sealing performance; Effectively improve the high composite bearing ability of nipple, the interior pressure drag suitable with body can be provided, the wedge type screw thread effectively improves the anti-dropout performance and the tensile load performance of nipple; The present invention has adopted the on-plane surface shoulder hermetically-sealed construction of metal and metal simultaneously, has reached the multi-sealing structure of nipple, has increased incompressible load-carrying ability and torque resistant performance and high sealing performance greatly.The present invention is fit to deep-well, ultradeep well, high pressure oil wells and high-pressure gas well and uses very much.
Claims (8)
1. a high sealability BCSG joint comprises box cupling (1) and body (2,32) through being threaded, and 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 (2,32) 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); Be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of step cylinder (10) and said body (2,32) in said, said shape metallic leak-proof structure comprises the inner seal structure (7) that is arranged on the said box cupling (1) and is arranged on the outer seal configuration (8) on the said body (2,32); Said inner seal structure (7) comprises the inner sealing surface (18) that is arranged between said interior step cylinder (10) end face and said box cupling (1) internal threaded end, and the radially middle part of the end face of said interior step cylinder (10) inwardly concaves the formation groove; Said outer seal configuration (8) comprises the external seal face (19) that is arranged on said body (2,32) the end outer wall, and the radially middle part of said body (2,32) end face outwards protrusion forms protruding.
2. according to the described high sealability BCSG of claim 1 joint, it is characterized in that: the value of said tooth side angle (16) is 5 ° ~ 15 °.
3. according to the described high sealability BCSG of claim 1 joint, 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 claim 1, wherein said high sealing fitting buttress casing, characterized in that: said inner cylindrical steps (10) and said side end surface groove coupling (1) the acute angle formed between the axis the inner sealing surface of the chamfer (26), said inner sealing surface of the chamfer (26) is 10 ° ~ 30 °, which on the other side of said coupling (1) acute angle formed between the radially inner shoulder inverted angle (28), said chamfered inner shoulder (28) has a value of 8 ° ~ 35 °; said tubular body (2, 32) on the side face of said projection tube (2,32) to the axis The acute angle formed between the outer sealing surface of the chamfer (27), said outer sealing surface chamfer (27) and the inner sealing surface chamfer (26) of the same value, which the other side of the tube body (2,32) acute angle formed between the radially outer shoulder chamfer (29), said outer shoulder chamfer (29) than the inside shoulder chamfer (28) Small 0 ~ 2 °.
5. according to the described high sealability BCSG of claim 4 joint, it is characterized in that: place, the summit of step cylinder (10) end face groove is provided with inner vertex circular arc (24) in said, and the radius of said inner vertex circular arc (24) is 0.20 ~ 1.2mm; The protruding place, summit of said body (2,32) end face is provided with outer dead centre circular arc (25), the big 0 ~ 0.5mm of radius of the said inner vertex circular arc of the radius ratio of said outer dead centre circular arc (25) (24).
6. according to the described high sealability BCSG of claim 1 joint, it is characterized in that: the length of said inner sealing surface (18) is 4 ~ 10mm, and the length of said external seal face (19) is than the long half pitch of length of said inner sealing surface (18).
7. according to the described high sealability BCSG of claim 1 joint; It is characterized in that: the interior shoulder thickness (22) of said inner seal structure (7) is 4 ~ 10mm, and the outer shoulder thickness (23) of said outer seal configuration (8) equates with said interior shoulder thickness (22).
8. according to the described high sealability BCSG of claim 1 joint; It is characterized in that: the inwall of said body (2,32) end is provided with inner cylinder face (30); Said inner cylinder face (30) links to each other through the endoporus of the transition conical surface (31) with said body (2,32), and the length of said 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 true CN102720440A (en) | 2012-10-10 |
| CN102720440B 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 |
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| CN (1) | CN102720440B (en) |
Cited By (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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| CN102852466A (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 connecting joint |
| CN102678065A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread pipe joint |
| CN102678071A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread sleeve connection joint |
| CN202673174U (en) * | 2012-06-06 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High seal special buttress thread pipe connector |
| CN202673177U (en) * | 2012-06-16 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High sealing partial trapezoidal thread casing pipe connector |
Cited By (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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|---|---|
| CN102720440B (en) | 2015-09-02 |
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