CN103352661B - Cambered surface circular bead type varied tooth-width wedge type coupling structure and oil well pipe structure - Google Patents
Cambered surface circular bead type varied tooth-width wedge type coupling structure and oil well pipe structure Download PDFInfo
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- CN103352661B CN103352661B CN201310302200.8A CN201310302200A CN103352661B CN 103352661 B CN103352661 B CN 103352661B CN 201310302200 A CN201310302200 A CN 201310302200A CN 103352661 B CN103352661 B CN 103352661B
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Abstract
The invention discloses a cambered surface bead type varied tooth-width wedge type coupling structure and an oil well pipe structure. Coupling inner thread sections are arranged at the inner walls of the two ends of a coupling body, and a coupling circular bead is arranged between the two coupling inner thread sections. Further, the inner bearing surface located at the most inner end position on the longitudinal section of the coupling body and an inner transitional circular arc are in smooth transition, the circle centers of the circular arcs of the inner transitional circular arcs are located in the coupling circular bead, the inner transitional circular arcs and inner sealing circular arcs are in smooth transition, the circle centers of the inner sealing circular arcs are located in the coupling inner thread section, the inner sealing circular arcs and inner sealing inclined surfaces are in smooth transition, and the inner sealing inclined surfaces are intersected with the coupling circular bead in acute angles. The cambered surface bead type varied tooth-width wedge type coupling structure and oil well pipe structure greatly increases the sealing performance and the counter bending capability of a thread connector, compression resisting capacity and high torque resisting performance.
Description
Technical field
The invention discloses the box cupling structure that a kind of oil drilling industry uses, the invention also discloses the oil well pipe structure that a kind of oil drilling industry uses.
Background technology
At present, oil casing threaded connection structure form in oil well pipe industry is substantially all to carry out improvement and bring new ideas according to API SPEC 5B " processing of sleeve pipe, oil pipe and line pipe thread, measurement and inspection specification " standard, the quality that is threaded that overall quality of connection compares API standard-required progressively improves a lot, but or can not meet oilfield exploitation instructions for use.The each oil field, the world that causes gradually all connects higher, the more preferably requirement of proposition at double thread, particularly requires more and more stricter to the relevant main performance index of oil well pipe.
Summary of the invention
An object of the present invention overcomes the deficiencies in the prior art, provides a kind of and can increase sealing performance that nipple connects, cambered surface shoulder type that bending resistance, incompressible load-carrying ability and high resistance torsional performance all increase becomes tooth wide wedge type box cupling structure.
Another object of the present invention is to provide and a kind ofly becomes the cambered surface shoulder type that tooth wide wedge type box cupling respective outer side edges uses with cambered surface shoulder type and become tooth wide wedged-shaped oil film well casing structure.
According to technical scheme provided by the invention, described a kind of cambered surface shoulder type becomes tooth wide wedge type box cupling structure, and comprise box cupling body, the two ends inwall of box cupling body is coupling inner thread section, is provided with box cupling shoulder between two sections of coupling inner thread sections, on direction by the portion wherein, both ends of box cupling body, the facewidth of described coupling inner thread section is in increasing setting gradually, the space width of coupling inner thread section is in reducing setting gradually, the difference of adjacent two facewidth is equal with the difference of adjacent two space widths, the height of each tooth of coupling inner thread section is equal, and the tapering of coupling inner thread section is 1:16 ~ 1:24, on the longitudinal cross-section of box cupling body, each tooth in coupling inner thread section is wedge shape, is equipped with barb in the both sides, top of each tooth, the middle top of each tooth in coupling inner thread section is interior crest top land, the inner side of interior crest top land is provided with interior tooth top inner plane, the outside of interior crest top land is provided with interior tooth top outerplanar, interior tooth top inner plane is connected by transition arc in interior crest top land with between interior crest top land, interior tooth top outerplanar is connected by the outer transition arc of interior crest top land with between interior crest top land, it is internal tooth bottom surface in the middle part of teeth groove, internal tooth bottom surface is taper seat, interior crest top land is taper seat, and internal tooth bottom surface, the tapering of interior crest top land is equal with the tapering of coupling inner thread section, the inner side of internal tooth bottom surface is provided with inner plane at the bottom of internal tooth, the outside of internal tooth bottom surface is provided with outerplanar at the bottom of internal tooth, the lateral wall of each tooth is provided with interior spigot surface, the axis angulation of interior spigot surface and box cupling body is 79 ~ 85 °, the inside wall of each tooth is provided with interior bearing surface, the axis angulation of interior bearing surface and box cupling body is 76 ~ 82 °, be connected by transition arc in internal tooth bottom surface between internal tooth bottom surface with inner plane at the bottom of internal tooth, be connected by transition arc outside internal tooth bottom surface between internal tooth bottom surface with outerplanar at the bottom of internal tooth, outerplanar at the bottom of internal tooth is connected by external arc at the bottom of internal tooth with between interior spigot surface, be connected by interior tooth top Inner arc between interior spigot surface with interior tooth top inner plane, inner plane at the bottom of internal tooth is connected by Inner arc at the bottom of internal tooth with between interior bearing surface, be connected by interior tooth top external arc between interior bearing surface with interior tooth top outerplanar, the axis angulation of inner plane at the bottom of internal tooth and box cupling body is 10 ~ 20 °, the axis angulation of interior tooth top outerplanar and box cupling body is 10 ~ 20 °, the axis angulation of outerplanar at the bottom of internal tooth and box cupling body is 7 ~ 17 °, the axis angulation of interior tooth top inner plane and box cupling body is 7 ~ 17 °, and on the longitudinal cross-section of box cupling body, the bearing surface and the transition arc that are positioned at inner terminal position seamlessly transit, the center of circle of interior transition arc is positioned at box cupling shoulder, interior transition arc and interior sealing circular arc seamlessly transit, the center of circle of interior sealing circular arc is positioned at coupling inner thread section, interior sealing circular arc and interior sealing inclined-plane seamlessly transit, and the inner hole wall of interior sealing inclined-plane and box cupling shoulder is sharp angle.
As preferably, the tapering of described coupling inner thread section is 1:18 ~ 1:20.
As preferably, the number of threads of described coupling inner thread section is 12 ~ 30; Interior first buckle teeth well width is: 1.8 ~ 3.2mm; Interior spigot surface pitch is: in it, first buckle teeth groove width width is multiplied by the multiple of first buckle teeth groove width in it, and interior spigot surface pitch is 3.96 ~ 9.60, and the multiple of described interior first buckle teeth groove width is 2.2 ~ 3.0; Interior bearing surface pitch equals: (internal thread total length deducts first buckle teeth groove width in 2 times)/(total button number deducts 1); The interior first buckle teeth facewidth is: interior spigot surface pitch deducts interior first buckle teeth groove width; Interior tooth depth is: 1.5 ~ 2.5mm.
As preferably, on the longitudinal cross-section of box cupling body, the first buckle teeth of coupling inner thread section is wide is 1.8 ~ 3.2mm; The tooth depth of each tooth of coupling inner thread section is 1.5 ~ 2.5mm; The width of interior tooth top inner plane is 0.5 ~ 3.0 mm; The width of interior bearing surface is 0.5 ~ 2.0 mm; Outerplanar width at the bottom of internal tooth is 0.5 ~ 3.0 mm; The outerplanar width of interior tooth top is 0.5 ~ 3.0 mm; The width of interior spigot surface is 0.5 ~ 2.0 mm; The width of inner plane at the bottom of internal tooth is 0.5 ~ 3.0 mm; The width of interior crest top land is 0.05 ~ 6.0 mm; The width of internal tooth bottom surface is 0.05 ~ 6.0 mm; The radius of interior tooth top external arc is 0.20 ~ 0.50mm; The radius of external arc at the bottom of internal tooth is 0.20 ~ 0.50mm; The radius of interior tooth top Inner arc is 0.20 ~ 0.50mm; The radius of Inner arc at the bottom of internal tooth is 0.20 ~ 0.50mm; Outside internal tooth bottom surface, the radius of transition arc is 0.15 ~ 0.30mm; In internal tooth bottom surface, the radius of transition arc is 0.15 ~ 0.30mm; In interior crest top land, the radius of transition arc is 0.15 ~ 0.30mm; In interior crest top land, the radius of transition arc is 0.15 ~ 0.30mm; Angle between the axis that angle between the axis of interior bearing surface and box cupling body is less than interior spigot surface and box cupling body is 2 ~ 6 °.
As preferably, the radius of described interior transition arc is 0.3 ~ 2.5mm, and the central angle number of degrees that interior transition arc is corresponding are 65 ° ~ 80 °; The radius of described interior sealing circular arc is 0.7 ~ 2.5mm, and the central angle number of degrees that interior sealing circular arc is corresponding are 75 ° ~ 85 °; The inner hole wall angulation of described interior sealing inclined-plane and box cupling shoulder is 60 ~ 80 °.
A kind of cambered surface shoulder type becomes tooth wide wedged-shaped oil film well casing structure, comprise oil well pipe body, the two ends outer wall of oil well pipe body is oil well pipe external thread section, oil well pipe shoulder is provided with between two sections of oil well pipe external thread sections, on direction by the portion wherein, both ends of oil well pipe body, the facewidth of described oil well pipe external thread section is in reducing setting gradually, the space width of oil well pipe external thread section is in increasing setting gradually, the difference of adjacent two facewidth is equal with the difference of adjacent two space widths, the height of each tooth of oil well pipe external thread section is equal, the tapering of oil well pipe external thread section is 1:16 ~ 1:24, on the longitudinal cross-section of oil well pipe body, each tooth on oil well pipe external thread section is wedge shape, is equipped with barb in the both sides, top of each tooth, the middle top of each tooth on oil well pipe external thread section is outer crest top land, the inner side of outer crest top land is provided with outer tooth top inner plane, the outside of outer crest top land is provided with outer tooth top outerplanar, outer tooth top inner plane is connected by transition arc in outer crest top land with between outer crest top land, outer tooth top outerplanar is connected by the outer transition arc of outer crest top land with between outer crest top land, it is external tooth bottom surface in the middle part of teeth groove, external tooth bottom surface is taper seat, outer crest top land is taper seat, and outer crest top land, the tapering of external tooth bottom surface is equal with the tapering of oil well pipe external thread section, the inner side of external tooth bottom surface is provided with inner plane at the bottom of external tooth, the outside of external tooth bottom surface is provided with outerplanar at the bottom of external tooth, the lateral wall of each tooth is provided with outer spigot surface, the axis angulation of outer spigot surface and oil well pipe body is 79 ~ 85 °, the inside wall of each tooth is provided with outer bearing surface, the axis angulation of outer bearing surface and oil well pipe body is 76 ~ 82 °, be connected by transition arc in external tooth bottom surface between external tooth bottom surface with inner plane at the bottom of external tooth, be connected by transition arc outside external tooth bottom surface between external tooth bottom surface with outerplanar at the bottom of external tooth, outerplanar at the bottom of external tooth is connected by external arc at the bottom of external tooth with between outer bearing surface, be connected by the left inside circular arc of outer tooth top between outer bearing surface with outer tooth top inner plane, inner plane at the bottom of external tooth is connected by Inner arc at the bottom of external tooth with between outer spigot surface, be connected by outer tooth top external arc between outer spigot surface with outer tooth top outerplanar, the axis angulation of inner plane at the bottom of internal tooth and box cupling body is 10 ~ 20 °, the axis angulation of outer tooth top outerplanar and oil well pipe body is 10 ~ 20 °, the axis angulation of outerplanar at the bottom of external tooth and oil well pipe body is 7 ~ 17 °, the axis angulation of outer tooth top inner plane and oil well pipe body is 7 ~ 17 °, and on the longitudinal cross-section of oil well pipe body, be positioned at the outer bearing surface of outermost end and outer transition arc rounding off, the center of circle of outer transition arc is positioned at the outside of oil well pipe external thread section length direction corresponding thereto, outer transition arc and external seal arc smooth transition, the oil well pipe external thread section that the center of circle of external seal circular arc is positioned at corresponding thereto is inner, external seal circular arc and external seal inclined-plane rounding off, external seal inclined-plane is crossing in obtuse angle with outer transition face, outer transition face is crossing in obtuse angle with the inner hole wall of oil well pipe external thread section, external seal inclined-plane is crossing in obtuse angle with the inner hole wall of oil well pipe external thread section.
As preferably, the tapering of described oil well pipe external thread section is 1:18 ~ 1:20.
As preferably, the number of threads of described oil well pipe external thread section is 12 ~ 30; Outside buckle teeth facewidth width is: 1.8 ~ 3.2mm; Outer spigot surface pitch is: the outside buckle teeth facewidth is multiplied by the multiple of the outside buckle teeth facewidth, and outer spigot surface pitch is 3.96 ~ 9.60mm, and the multiple of the described outside buckle teeth facewidth is 2.2 ~ 3.0; Outer bearing surface pitch is: (external screw thread total length deducts 2 times of outside buckle teeth facewidth)/(total button number deducts 1); Outside buckle teeth groove width is: outer spigot surface pitch deducts the outside buckle teeth facewidth; Outer tooth depth is: 1.5 ~ 2.5mm.
As preferably, on the longitudinal cross-section of oil well pipe body, the first buckle teeth of oil well pipe external thread section is wide is 1.8 ~ 3.2mm; The tooth depth of each tooth of oil well pipe external thread section is 1.5 ~ 2.5mm; The width of outer tooth top inner plane is 0.5 ~ 3.0 mm; The width of outer bearing surface is 0.5 ~ 2.0 mm; Outerplanar width at the bottom of external tooth is 0.5 ~ 3.0 mm; The outerplanar width of outer tooth top is 0.5 ~ 3.0 mm; The width of outer spigot surface is 0.5 ~ 2.0 mm; The width of inner plane at the bottom of external tooth is 0.5 ~ 3.0 mm; The width of outer crest top land is 0.05 ~ 6.0 mm; The width of external tooth bottom surface is 0.05 ~ 6.0 mm; The radius of outer tooth top external arc is 0.20 ~ 0.50mm; The radius of Inner arc at the bottom of external tooth is 0.20 ~ 0.50mm; The radius of the left inside circular arc of outer tooth top is 0.20 ~ 0.50mm; The radius of external arc at the bottom of external tooth is 0.20 ~ 0.50mm; The radius of the outer transition arc of outer crest top land is 0.15 ~ 0.30mm; In outer crest top land, the radius of transition arc is 0.15 ~ 0.30mm; In external tooth bottom surface, the radius of transition arc is 0.15 ~ 0.30mm; Outside external tooth bottom surface, the radius of transition arc is 0.15 ~ 0.30mm; Angle between outer bearing surface and the oil well pipe body axis angle be less than between outer spigot surface and oil well pipe body axis is 2 ~ 6 °.
As preferably, the radius of described outer transition arc is 0.5 ~ 0.25mm, and the central angle number of degrees that outer transition arc is corresponding are 65 ° ~ 80 °; The radius of external seal circular arc is 0.7 ~ 0.25mm, and the central angle number of degrees that outer transition arc is corresponding are 65 ° ~ 80 °; The external seal inclined-plane angle crossing with the inner hole wall of oil well pipe external thread section is 110 ~ 120 °.
The present invention has the following advantages:
1, the shape of threaded engagement tooth form is improved, have employed the two barb tooth side angle shape of wedge type, the tooth side angle on both sides adopts bearing surface angle to be greater than spigot surface angle, tooth side, screw thread both sides and tooth side is made to reach interference fit under playing the tight state of high pulling torque machine, its sealing performance of effective raising also increases bonding strength, and its each profile of tooth tooth side distribution of force is even.
2, the tooth form bearing surface of form of thread and the pitch of tooth form spigot surface are improved to unequal helicitic texture form, the flute profile width that box cupling and body start when screwing near end face is all less than space width, and make-up very simply meets screwing of internal and external threads and do not interfere.And serve upper shackle fast and repeatedly go up shackle screw thread and can not occur to scratch and damage phenomenon, stopped thread alternating phenomenon simultaneously, effectively improved the quality of products and operating efficiency.
3, become tooth wide thread forms owing to have employed uniform pitch, the various impacts when difference effectively significantly reduced because of body and box cupling ovality coordinates internal and external threads, significantly improve the sealing performance between profile of tooth and anti-load-carrying ability.
4, adopt wedge type and become the wide Design of Screw Thread structure of tooth and will effectively improve anti-tripping, the tensile loads performance of nipple, wedge type screw thread can significantly increase its bonding strength and bending resistance, the high composite bearing ability of effective raising nipple, can provide suitable with body in press drag;
5, the tooth top of screw thread and the structure design that have employed three different taperings of plane or angle at the bottom of tooth, but not cambered surface, reduce difficulty of processing, reach plane and contact with interplanar, eliminate the impact that internal and external threads improves interference fit double thread profile of tooth sealing performance under the factor impacts such as different ovalitys.
6, add plane torque shoulder structure at pipe end and box cupling centre, improve its anti-torsional performance and incompressible and tensile load performance excessively;
7, its box cupling torque shoulder plane and inboard wall of tube body adopt interior concordant design, effectively can reduce turbulent phenomenon when respective media is passed through in pipeline, energy loss are reduced to minimum;
8, the present invention is applicable to the use of deep-well, ultradeep well, high pressure oil wells and high-pressure gas well very much.
Accompanying drawing explanation
Fig. 1 is the structural representation of box cupling body in the present invention.
Fig. 2 is the enlarged diagram of part A in Fig. 1.
Fig. 3 is the enlarged diagram of part B in Fig. 1.
Fig. 4 is the structural representation of oil well pipe body in the present invention.
Fig. 5 is the enlarged diagram of C part in Fig. 4.
Fig. 6 is the enlarged diagram of D part in Fig. 4.
Fig. 7 is the integrated structure schematic diagram of box cupling body and oil well pipe body in the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
A kind of cambered surface shoulder type becomes tooth wide wedge type box cupling structure, and comprise box cupling body 1, the two ends inwall of box cupling body 1 is coupling inner thread section 1.1, is provided with box cupling shoulder 1.2 between two sections of coupling inner thread sections 1.1, on direction by the portion wherein, both ends of box cupling body 1, the facewidth of described coupling inner thread section 1.1 is in increasing setting gradually, the space width of coupling inner thread section 1.1 is in reducing setting gradually, the difference of adjacent two facewidth is equal with the difference of adjacent two space widths, the height of each tooth of coupling inner thread section 1.1 is equal, and the tapering of coupling inner thread section 1.1 is 1:16 ~ 1:24, on the longitudinal cross-section of box cupling body 1, each tooth in coupling inner thread section 1.1 is wedge shape, is equipped with barb in the both sides, top of each tooth, the middle top of each tooth in coupling inner thread section 1.1 is interior crest top land 58, the inner side of interior crest top land 58 is provided with interior tooth top inner plane 56, the outside of interior crest top land 58 is provided with interior tooth top outerplanar 53, be connected by transition arc 69 in interior crest top land between interior tooth top inner plane 56 with interior crest top land 58, be connected by the outer transition arc 70 of interior crest top land between interior tooth top outerplanar 53 with interior crest top land 58, it is internal tooth bottom surface 57 in the middle part of teeth groove, internal tooth bottom surface 57 is taper seat, interior crest top land 58 is taper seat, and internal tooth bottom surface 57, the tapering of interior crest top land 58 is equal with the tapering of coupling inner thread section 1.1, the inner side of internal tooth bottom surface 57 is provided with inner plane 51 at the bottom of internal tooth, the outside of internal tooth bottom surface 57 is provided with outerplanar 54 at the bottom of internal tooth, the lateral wall of each tooth is provided with interior spigot surface 55, interior spigot surface 55 is 79 ~ 85 ° with the axis angulation of box cupling body 1, the inside wall of each tooth is provided with interior bearing surface 52, interior bearing surface 52 is 76 ~ 82 ° with the axis angulation of box cupling body 1, be connected by transition arc 68 in internal tooth bottom surface between internal tooth bottom surface 57 with inner plane at the bottom of internal tooth 51, be connected by transition arc 67 outside internal tooth bottom surface between internal tooth bottom surface 57 with outerplanar at the bottom of internal tooth 54, outerplanar 54 at the bottom of internal tooth is connected by external arc 63 at the bottom of internal tooth with between interior spigot surface 55, be connected by interior tooth top Inner arc 64 between interior spigot surface 55 with interior tooth top inner plane 56, inner plane 51 at the bottom of internal tooth is connected by Inner arc 65 at the bottom of internal tooth with between interior bearing surface 52, be connected by interior tooth top external arc 66 between interior bearing surface 52 with interior tooth top outerplanar 53, at the bottom of internal tooth, inner plane 51 is 10 ~ 20 ° with the axis angulation of box cupling body 1, interior tooth top outerplanar 53 is 10 ~ 20 ° with the axis angulation of box cupling body 1, at the bottom of internal tooth, outerplanar 54 is 7 ~ 17 ° with the axis angulation of box cupling body 1, interior tooth top inner plane 56 is 7 ~ 17 ° with the axis angulation of box cupling body 1, and on the longitudinal cross-section of box cupling body 1, the bearing surface 52 being positioned at inner terminal position seamlessly transits with transition arc 48, the center of circle of interior transition arc 48 is positioned at box cupling shoulder 1.2, interior transition arc 48 seamlessly transits with interior sealing circular arc 46, the center of circle of interior sealing circular arc 46 is positioned at coupling inner thread section 1.1, interior sealing circular arc 46 seamlessly transits with interior sealing inclined-plane 44, and interior sealing inclined-plane 44 is sharp angle with the inner hole wall of box cupling shoulder 1.2.
As preferably, the tapering of described coupling inner thread section 1.1 is 1:18 ~ 1:20.
As preferably, the number of threads of described coupling inner thread section 1.1 is 12 ~ 30; Interior first buckle teeth well width is: 1.8 ~ 3.2mm; Interior spigot surface pitch is: in it, first buckle teeth groove width width is multiplied by the multiple of first buckle teeth groove width in it, and interior spigot surface pitch is 3.96 ~ 9.60, and the multiple of described interior first buckle teeth groove width is 2.2 ~ 3.0; Interior bearing surface pitch equals: (internal thread total length deducts first buckle teeth groove width in 2 times)/(total button number deducts 1); The interior first buckle teeth facewidth is: interior spigot surface pitch deducts interior first buckle teeth groove width; Interior tooth depth is: 1.5 ~ 2.5mm.
As preferably, on the longitudinal cross-section of box cupling body 1, the first buckle teeth of coupling inner thread section 1.1 is wide is 1.8 ~ 3.2mm; The tooth depth of each tooth of coupling inner thread section 1.1 is 1.5 ~ 2.5mm; The width of interior tooth top inner plane 56 is 0.5 ~ 3.0 mm; The width of interior bearing surface 52 is 0.5 ~ 2.0 mm; At the bottom of internal tooth, the width of outerplanar 54 is 0.5 ~ 3.0 mm; The width of interior tooth top outerplanar 53 is 0.5 ~ 3.0 mm; The width of interior spigot surface 55 is 0.5 ~ 2.0 mm; At the bottom of internal tooth, the width of inner plane 51 is 0.5 ~ 3.0 mm; The width of interior crest top land 58 is 0.05 ~ 6.0 mm; The width of internal tooth bottom surface 57 is 0.05 ~ 6.0 mm; The radius of interior tooth top external arc 66 is 0.20 ~ 0.50mm; At the bottom of internal tooth, the radius of external arc 63 is 0.20 ~ 0.50mm; The radius of interior tooth top Inner arc 64 is 0.20 ~ 0.50mm; At the bottom of internal tooth, the radius of Inner arc 65 is 0.20 ~ 0.50mm; Outside internal tooth bottom surface, the radius of transition arc 67 is 0.15 ~ 0.30mm; In internal tooth bottom surface, the radius of transition arc 68 is 0.15 ~ 0.30mm; In interior crest top land, the radius of transition arc 69 is 0.15 ~ 0.30mm; In interior crest top land, the radius of transition arc 69 is 0.15 ~ 0.30mm; Angle between interior bearing surface 52 and the axis of box cupling body 1 angle be less than between interior spigot surface 55 and the axis of box cupling body 1 is 2 ~ 6 °.
As preferably, the radius of described interior transition arc 48 is 0.3 ~ 2.5mm, and the central angle number of degrees of interior transition arc 48 correspondence are 65 ° ~ 80 °; The radius of described interior sealing circular arc 46 is 0.7 ~ 2.5mm, and the central angle number of degrees of interior sealing circular arc 46 correspondence are 75 ° ~ 85 °; Described interior sealing inclined-plane 44 is 60 ~ 80 ° with the inner hole wall angulation of box cupling shoulder 1.2.
A kind of cambered surface shoulder type becomes tooth wide wedged-shaped oil film well casing structure, comprise oil well pipe body 2, the two ends outer wall of oil well pipe body 2 is oil well pipe external thread section 2.1, oil well pipe shoulder 2.2 is provided with between two sections of oil well pipe external thread sections 2.1, on direction by the portion wherein, both ends of oil well pipe body 2, the facewidth of described oil well pipe external thread section 2.1 is in reducing setting gradually, the space width of oil well pipe external thread section 2.1 is in increasing setting gradually, the difference of adjacent two facewidth is equal with the difference of adjacent two space widths, the height of each tooth of oil well pipe external thread section 2.1 is equal, the tapering of oil well pipe external thread section 2.1 is 1:16 ~ 1:24, on the longitudinal cross-section of oil well pipe body 2, each tooth on oil well pipe external thread section 2.1 is wedge shape, is equipped with barb in the both sides, top of each tooth, the middle top of each tooth on oil well pipe external thread section 2.1 is outer crest top land 26, the inner side of outer crest top land 26 is provided with outer tooth top inner plane 20, the outside of outer crest top land 26 is provided with outer tooth top outerplanar 23, be connected by transition arc 37 in outer crest top land between outer tooth top inner plane 20 with outer crest top land 26, be connected by the outer transition arc 36 of outer crest top land between outer tooth top outerplanar 23 with outer crest top land 26, it is external tooth bottom surface 27 in the middle part of teeth groove, external tooth bottom surface 27 is taper seat, outer crest top land 26 is taper seat, and outer crest top land 26, the tapering of external tooth bottom surface 27 is equal with the tapering of oil well pipe external thread section 2.1, the inner side of external tooth bottom surface 27 is provided with inner plane 25 at the bottom of external tooth, the outside of external tooth bottom surface 27 is provided with outerplanar 22 at the bottom of external tooth, the lateral wall of each tooth is provided with outer spigot surface 24, outer spigot surface 24 is 79 ~ 85 ° with the axis angulation of oil well pipe body 2, the inside wall of each tooth is provided with outer bearing surface 21, outer bearing surface 21 is 76 ~ 82 ° with the axis angulation of oil well pipe body 2, be connected by transition arc 38 in external tooth bottom surface between external tooth bottom surface 27 with inner plane at the bottom of external tooth 25, be connected by transition arc 39 outside external tooth bottom surface between external tooth bottom surface 27 with outerplanar at the bottom of external tooth 22, outerplanar 22 at the bottom of external tooth is connected by external arc 35 at the bottom of external tooth with between outer bearing surface 21, be connected by the left inside circular arc 34 of outer tooth top between outer bearing surface 21 with outer tooth top inner plane 20, inner plane 25 at the bottom of external tooth is connected by Inner arc 33 at the bottom of external tooth with between outer spigot surface 24, be connected by outer tooth top external arc 32 between outer spigot surface 24 with outer tooth top outerplanar 23, at the bottom of internal tooth, inner plane 51 is 10 ~ 20 ° with the axis angulation of box cupling body 1, outer tooth top outerplanar 23 is 10 ~ 20 ° with the axis angulation of oil well pipe body 2, at the bottom of external tooth, outerplanar 22 is 7 ~ 17 ° with the axis angulation of oil well pipe body 2, outer tooth top inner plane 20 is 7 ~ 17 ° with the axis angulation of oil well pipe body 2, and on the longitudinal cross-section of oil well pipe body 2, be positioned at the outer bearing surface 21 of outermost end and outer transition arc 47 rounding off, the center of circle of outer transition arc 47 is positioned at the outside of oil well pipe external thread section 2.1 length direction corresponding thereto, outer transition arc 47 and external seal circular arc 45 rounding off, the oil well pipe external thread section 2.1 that the center of circle of external seal circular arc 45 is positioned at corresponding thereto is inner, external seal circular arc 45 and external seal inclined-plane 43 rounding off, external seal inclined-plane 43 is crossing in obtuse angle with outer transition face 41, outer transition face 41 is crossing in obtuse angle with the inner hole wall of oil well pipe external thread section 2.1, external seal inclined-plane 43 is crossing in obtuse angle with the inner hole wall of oil well pipe external thread section 2.1.
As preferably, the tapering of described oil well pipe external thread section 2.1 is 1:18 ~ 1:20.
As preferably, the number of threads of described oil well pipe external thread section 2.1 is 12 ~ 30; Outside buckle teeth facewidth width is: 1.8 ~ 3.2mm; Outer spigot surface pitch is: the outside buckle teeth facewidth is multiplied by the multiple of the outside buckle teeth facewidth, and outer spigot surface pitch is 3.96 ~ 9.60mm, and the multiple of the described outside buckle teeth facewidth is 2.2 ~ 3.0; Outer bearing surface pitch is: (external screw thread total length deducts 2 times of outside buckle teeth facewidth)/(total button number deducts 1); Outside buckle teeth groove width is: outer spigot surface pitch deducts the outside buckle teeth facewidth; Outer tooth depth is: 1.5 ~ 2.5mm.
As preferably, on the longitudinal cross-section of oil well pipe body 2, the first buckle teeth of oil well pipe external thread section 2.1 is wide is 1.8 ~ 3.2mm; The tooth depth of each tooth of oil well pipe external thread section 2.1 is 1.5 ~ 2.5mm; The width of outer tooth top inner plane 20 is 0.5 ~ 3.0 mm; The width of outer bearing surface 21 is 0.5 ~ 2.0 mm; At the bottom of external tooth, the width of outerplanar 22 is 0.5 ~ 3.0 mm; The width of outer tooth top outerplanar 23 is 0.5 ~ 3.0 mm; The width of outer spigot surface 24 is 0.5 ~ 2.0 mm; At the bottom of external tooth, the width of inner plane 25 is 0.5 ~ 3.0 mm; The width of outer crest top land 26 is 0.05 ~ 6.0 mm; The width of external tooth bottom surface 27 is 0.05 ~ 6.0 mm; The radius of outer tooth top external arc 32 is 0.20 ~ 0.50mm; At the bottom of external tooth, the radius of Inner arc 33 is 0.20 ~ 0.50mm; The radius of the left inside circular arc 34 of outer tooth top is 0.20 ~ 0.50mm; At the bottom of external tooth, the radius of external arc 35 is 0.20 ~ 0.50mm; The radius of the outer transition arc 36 of outer crest top land is 0.15 ~ 0.30mm; In outer crest top land, the radius of transition arc 37 is 0.15 ~ 0.30mm; In external tooth bottom surface, the radius of transition arc 38 is 0.15 ~ 0.30mm; Outside external tooth bottom surface, the radius of transition arc 39 is 0.15 ~ 0.30mm; Angle between outer bearing surface 21 and the oil well pipe body 2 axis angle be less than between outer spigot surface 24 and oil well pipe body 2 axis is 2 ~ 6 °.
As preferably, the radius of described outer transition arc 47 is 0.5 ~ 0.25mm, and the central angle number of degrees of outer transition arc 47 correspondence are 65 ° ~ 80 °; The radius of external seal circular arc 45 is 0.7 ~ 0.25mm, and the central angle number of degrees of outer transition arc 47 correspondence are 65 ° ~ 80 °; External seal inclined-plane 43 angle crossing with the inner hole wall of oil well pipe external thread section 2.1 is 110 ~ 120 °.
During use, oil well pipe body 2 and oil well pipe body 2 carry out somely being connected to form casing string with the form of being threaded by box cupling body 1, casing string inside becomes the overall space passage of a UNICOM, the power that extraneous high strength complexity can be born in inner passage applies and does not reveal or damage, and meets the requirement of oil gas field production and application.
Parameter designing of the present invention requires:
Coupling inner thread section 1.1 is identical with the thread parameter major part of oil well pipe external thread section 2.1, and just tolerance is different, for meeting the interference fit requirement between internal and external threads profile of tooth.
1. oil well pipe external thread section 2.1 external screw thread total length requires identical with coupling inner thread section 1.1 internal thread overall length dimension, length is all within the scope of 50 ~ 160mm, different according to pipe wall thickness and external diameter, can with reference to API SPEC 5B " processing of sleeve pipe, oil pipe and line pipe thread, measurement and inspection specification ".
2. oil well pipe external thread section 2.1, oil well pipe external thread section 2.1 tooth number according to full flight length scope and tooth is wide and the size of pitch is determined preferably to control between 12 ~ 30 teeth the concrete tooth number of screw thread, selected amount when being screw thread comprehensive Design.
3. oil well pipe external thread section 2.1 is identical with the tapering of coupling inner thread section 1.1.
4. the oil well pipe external thread section 2.1 first buckle teeth facewidth is identical with the width requirement of coupling inner thread section 1.1 first buckle teeth groove width.The multiple of the oil well pipe external thread section 2.1 first buckle teeth facewidth requires identical with the multiple of coupling inner thread section 1.1 first buckle teeth groove width.The outer spigot surface pitch of oil well pipe external thread section 2.1 requires identical with the interior spigot surface pitch of coupling inner thread section 1.1.The outer bearing surface pitch 15 of oil well pipe external thread section 2.1 requires identical with the interior bearing surface pitch 46 of coupling inner thread section 1.1.
5. the oil well pipe external thread section 2.1 first buckle teeth facewidth is identical with the width requirement of coupling inner thread section 1.1 first buckle teeth groove width.Its follow-up external screw thread tooth width recruitment and follow-up internal thread alveolus width recruitment require both it identical.
6. the outer bearing surface pitch of oil well pipe external thread section 2.1 requires identical with the interior bearing surface pitch of coupling inner thread section 1.1.
7. the first buckle teeth groove width calculating formula of oil well pipe external thread section 2.1 is: the outside buckle teeth facewidth width of the outer spigot surface pitch-oil well pipe external thread section 2.1 of oil well pipe external thread section 2.1, its follow-up alveolus width will reduce gradually, its decrease is the difference that bearing surface pitch deducts spigot surface pitch, but can not be less than 0.02mm.The first buckle teeth facewidth calculating formula of coupling inner thread section 1.1 is: the interior first buckle teeth groove width width of the interior spigot surface pitch-coupling inner thread section 1.1 of coupling inner thread section 1.1, identical with it.
8. the recruitment that the externally threaded tooth of oil well pipe external thread section 2.1 is wide is identical with alveolus width reduction, outer bearing surface pitch and the outer spigot surface pitch of oil well pipe external thread section 2.1 all remain unchanged, and what gradually change is tooth width and alveolus width, ensure that screwing of internal and external threads is smooth and easy without interfering;
The recruitment that the alveolus of the internal thread of coupling inner thread section 1.1 is wide is identical with tooth width decrease, the interior bearing surface pitch of coupling inner thread section 1.1 and the interior spigot surface pitch of coupling inner thread section 1.1 all remain unchanged, and what gradually change is tooth width and alveolus width, ensure that screwing of internal and external threads is smooth and easy without interfering.Ensure that its internal and external threads proper engagement.
9. the tooth depth of oil well pipe external thread section 2.1 is identical with the tooth depth of coupling inner thread section 1.1, and they are all between 1.5mm ~ 2.5mm, parallel with at the bottom of tooth at the bottom of tooth.
10. the angle between outer bearing surface 21 and oil well pipe body 2 axis is less than the angle between outer spigot surface 24 and oil well pipe body 2 axis, keeps the difference of 2 ~ 6 ° between them.Angle between interior bearing surface 52 and the axis of box cupling body 1 is less than the angle between interior spigot surface 55 and the axis of box cupling body 1, and keep the difference of 2 ~ 6 ° between them, both are identical, forms wedge shape tooth form angle.
Angle between 11. outer tooth top inner planes 20 and oil well pipe body 2 axis, outerplanar 22 at the bottom of external tooth and the angle between oil well pipe body 2 axis, angle between the axis of inner plane 51 and box cupling body 1 at the bottom of internal tooth, angle between interior tooth top outerplanar 53 and the axis of box cupling body 1 is identical, angle between outer tooth top outerplanar 23 and oil well pipe body 2 axis, inner plane 25 at the bottom of external tooth and the angle between oil well pipe body 2 axis, angle between the axis of outerplanar 54 and box cupling body 1 at the bottom of internal tooth, angle between interior tooth top inner plane 56 and the axis of box cupling body 1 is identical.Outerplanar 22 at the bottom of external tooth is identical with the angle at the bottom of the angle between oil well pipe body 2 axis, the angle between outer tooth top outerplanar 23 and oil well pipe body 2 axis, the angle between interior tooth top inner plane 56 and the axis of box cupling body 1, internal tooth between outerplanar 54 and the axis of box cupling body 1.Outerplanar 22 at the bottom of external tooth is identical with the angle at the bottom of the angle between oil well pipe body 2 axis, the angle between outer tooth top inner plane 20 and oil well pipe body 2 axis, the angle between interior tooth top outerplanar 53 and the axis of box cupling body 1, internal tooth between inner plane 51 and the axis of box cupling body 1.
Radius and their corresponding central angle number of degrees of 12. outer tooth top external arc 32 and outer tooth top Inner arc 34 are identical, radius and their corresponding central angle number of degrees of external arc 63 at the bottom of internal tooth and Inner arc at the bottom of internal tooth 65 are identical, and the arc radius of outer tooth top external arc 32 and outer tooth top Inner arc 34 is greater than Inner arc 65 radius 0.05 ~ 0.20mm at the bottom of external arc 63 at the bottom of internal tooth and internal tooth.Simultaneously, radius and their corresponding central angle number of degrees of Inner arc 33 at the bottom of external tooth and external arc at the bottom of external tooth 35 are identical, radius and their corresponding central angle number of degrees of interior tooth top Inner arc 64 and interior tooth top external arc 66 are identical, and at the bottom of Inner arc 33 at the bottom of external tooth and external tooth, the arc radius of external arc 35 is greater than interior tooth top Inner arc 64 and interior tooth top external arc 66 radius 0.05 ~ 0.20mm.The touching damage occurred when can eliminate its interference fit like this scratches phenomenon.
In the outer transition arc 36 of 13. outer crest top lands, outer crest top land, transition arc 37 is all identical with transition arc 70 radius outside transition arc 69, interior crest top land in interior crest top land with transition arc in transition arc 67, internal tooth bottom surface outside transition arc 39, internal tooth bottom surface outside transition arc 38, external tooth bottom surface in external tooth bottom surface 68, and their radius is 0.20mm ~ 0.50mm.
In 14., transition arc 48 is identical with outer transition arc 47 radius, interior sealing circular arc 46 is identical with external seal circular arc 45, the center of circle of interior sealing circular arc 46 is identical to the distance between oil well pipe external thread section 2.1 inner hole wall with the center of circle of external seal circular arc 45 to the distance between box cupling shoulder 1.2 inner hole wall, reaches interference fit and high sealing performance to meet interior sealing circular arc 46 with the accurate contraposition of external seal circular arc 45.
In 16., sealing inclined-plane 44 and the inner hole wall angulation of box cupling shoulder 1.2 are less than or equal to the supplementary angle of external seal inclined-plane 43 angle crossing with the inner hole wall of oil well pipe external thread section 2.1, it keeps the difference of 0 ° ~ 2.0 ° each other, be best with 0.5 ~ 1.0 °, meet the plastic deformation state that inside and outside shoulder causes in the tight situation of machine and be issued to interference fit, improve its torque resistant performance requirement.
Concrete operations are as follows:
First by external threaded surface uniform application one deck oil dedicated thread compound of oil well pipe body 2, again any one end of box cupling 1 is first inserted on oil well pipe body 2 external screw thread, the external screw thread of the internal thread of box cupling body 1 and oil well pipe body 2 should be carried out make-up when being inserted in, light and slow internal thread tooth top should be contacted with at the bottom of external screw thread tooth during hitch, due to the unequal threaded engagement form of the pitch that have employed tooth form bearing surface and tooth form spigot surface, the tooth of its box cupling end and body end thread is wide, and to be less than alveolus wide be that uniform pitch becomes the wide form of thread of tooth, its make-up is very convenient and simple, substantially thread alternating phenomenon can not be there is.First be inserted in 2 ~ 4 button left and right, start manually hand-tight very light when screwing internal and external threads, when manually not rotating and hand-tightly to complete.Because the tolerance of some parameters such as tapering, pitch, tooth form, tooth depth of screw thread is different, hand-tight rear thread connects to twist receives position, also needs to use further high pulling torque/high moment of torsion to carry out machine and twists when connecing, should adopt at a slow speed or carry out slowly.Now in reach, be issued to the interference fit between tooth form in the situation of uniform stressed at the bottom of the bearing surface of each tooth and spigot surface and tooth top tooth, tooth form sealing structure performance significantly improves, and the impact that the different double threads of body and box cupling ovality coordinate is very little.Simultaneously, face between the intersecting lens of the end face of the face between the intersecting lens of the end face of internal tooth bottom surface 57 and box cupling shoulder 1.2 and the endoporus wall of box cupling shoulder 1.2, external tooth bottom surface 27 and coupling inner thread section 1.1 and coupling inner thread section 1.1 inner hole wall reaches interference fit, considerably increases the ability of its high resistance torsional performance and compressive load ability and tensile load.Its nipple is made to have high sealing performance, high composite bearing ability.Machine twist connect after detect gap length inside and outside it after shoulder interference fit with ultra-thin special blade, any gap must not be had, the point of a knife of blade can not be inserted circumferentially to detect.
Its box cupling body 1 and oil well pipe body 2 are closely cooperate for benchmark with virtual middle line by same fastening method, reach oil well pipe body 2 and oil well pipe body 2 and are undertaken by box cupling body 1 that some connecting-types become oil, casing string meets the requirement of oil gas field production and application.When going into the well in oil field, its connector machine is one by one close to the oil casing that direct type becomes thousands of meters.
Operating principle of the present invention is as follows:
Body and body carry out somely being connected to form casing string with the form of being threaded by box cupling, casing string inside becomes the overall space passage of a UNICOM, the power that extraneous high strength complexity can be born in inner passage applies and does not reveal or damage, and meets the requirement of oil gas field production and application.
Claims (10)
1. cambered surface shoulder type becomes a tooth wide wedge type box cupling structure, and comprise box cupling body (1), the two ends inwall of box cupling body (1) is coupling inner thread section (1.1), is provided with box cupling shoulder (1.2) between two sections of coupling inner thread sections (1.1), it is characterized in that: on the direction by the portion wherein, both ends of box cupling body (1), the facewidth of described coupling inner thread section (1.1) is in increasing setting gradually, the space width of coupling inner thread section (1.1) is in reducing setting gradually, the difference of adjacent two facewidth is equal with the difference of adjacent two space widths, the height of each tooth of coupling inner thread section (1.1) is equal, and the tapering of coupling inner thread section (1.1) is 1:16 ~ 1:24, on the longitudinal cross-section of box cupling body (1), each tooth in coupling inner thread section (1.1) is wedge shape, is equipped with barb in the both sides, top of each tooth, the middle top of each tooth in coupling inner thread section (1.1) is interior crest top land (58), the inner side of interior crest top land (58) is provided with interior tooth top inner plane (56), the outside of interior crest top land (58) is provided with interior tooth top outerplanar (53), interior tooth top inner plane (56) is connected by transition arc (69) in interior crest top land with between interior crest top land (58), interior tooth top outerplanar (53) is connected by the outer transition arc (70) of interior crest top land with between interior crest top land (58), it is internal tooth bottom surface (57) in the middle part of teeth groove, internal tooth bottom surface (57) is taper seat, interior crest top land (58) is taper seat, and internal tooth bottom surface (57), the tapering of interior crest top land (58) is equal with the tapering of coupling inner thread section (1.1), the inner side of internal tooth bottom surface (57) is provided with inner plane at the bottom of internal tooth (51), the outside of internal tooth bottom surface (57) is provided with outerplanar at the bottom of internal tooth (54), the lateral wall of each tooth is provided with interior spigot surface (55), interior spigot surface (55) is 79 ° ~ 85 ° with the axis angulation of box cupling body (1), the inside wall of each tooth is provided with interior bearing surface (52), interior bearing surface (52) is 76 ° ~ 82 ° with the axis angulation of box cupling body (1), be connected by transition arc (68) in internal tooth bottom surface between internal tooth bottom surface (57) with inner plane at the bottom of internal tooth (51), be connected by transition arc (67) outside internal tooth bottom surface between internal tooth bottom surface (57) with outerplanar at the bottom of internal tooth (54), be connected by external arc (63) at the bottom of internal tooth between outerplanar at the bottom of internal tooth (54) with interior spigot surface (55), be connected by interior tooth top Inner arc (64) between interior spigot surface (55) with interior tooth top inner plane (56), be connected by Inner arc (65) at the bottom of internal tooth between inner plane at the bottom of internal tooth (51) with interior bearing surface (52), be connected by interior tooth top external arc (66) between interior bearing surface (52) with interior tooth top outerplanar (53), inner plane at the bottom of internal tooth (51) is 10 ° ~ 20 ° with the axis angulation of box cupling body (1), interior tooth top outerplanar (53) is 10 ° ~ 20 ° with the axis angulation of box cupling body (1), outerplanar at the bottom of internal tooth (54) is 7 ° ~ 17 ° with the axis angulation of box cupling body (1), interior tooth top inner plane (56) is 7 ° ~ 17 ° with the axis angulation of box cupling body (1), and on the longitudinal cross-section of box cupling body (1), the bearing surface (52) being positioned at inner terminal position seamlessly transits with transition arc (48), the center of circle of interior transition arc (48) is positioned at box cupling shoulder (1.2), interior transition arc (48) and interior sealing circular arc (46) seamlessly transit, the center of circle of interior sealing circular arc (46) is positioned at coupling inner thread section (1.1), interior sealing circular arc (46) and interior sealing inclined-plane (44) seamlessly transit, and interior sealing inclined-plane (44) is sharp angle with the inner hole wall of box cupling shoulder (1.2).
2. cambered surface shoulder type as claimed in claim 1 becomes tooth wide wedge type box cupling structure, it is characterized in that: the tapering of described coupling inner thread section (1.1) is 1:18 ~ 1:20.
3. cambered surface shoulder type as claimed in claim 1 becomes tooth wide wedge type box cupling structure, it is characterized in that: the number of threads of described coupling inner thread section (1.1) is 12 ~ 30; Interior first buckle teeth well width is: 1.8 ~ 3.2mm; Interior spigot surface pitch is: in it, first buckle teeth groove width width is multiplied by the multiple of first buckle teeth groove width in it, and interior spigot surface pitch is 3.96 ~ 9.60 mm, and the multiple of described interior first buckle teeth groove width is 2.2 ~ 3.0; Interior bearing surface pitch equals: internal thread total length deducts first buckle teeth groove width in 2 times/total button number and deducts 1; The interior first buckle teeth facewidth is: interior spigot surface pitch deducts interior first buckle teeth groove width; Interior tooth depth is: 1.5 ~ 2.5mm.
4. cambered surface shoulder type as claimed in claim 1 becomes tooth wide wedge type box cupling structure, and it is characterized in that: on the longitudinal cross-section of box cupling body (1), the first buckle teeth of coupling inner thread section (1.1) is wide is 1.8 ~ 3.2mm; The tooth depth of each tooth of coupling inner thread section (1.1) is 1.5 ~ 2.5mm; The width of interior tooth top inner plane (56) is 0.5 ~ 3.0 mm; The width of interior bearing surface (52) is 0.5 ~ 2.0 mm; The width of outerplanar at the bottom of internal tooth (54) is 0.5 ~ 3.0 mm; The width of interior tooth top outerplanar (53) is 0.5 ~ 3.0 mm; The width of interior spigot surface (55) is 0.5 ~ 2.0 mm; The width of inner plane at the bottom of internal tooth (51) is 0.5 ~ 3.0 mm; The width of interior crest top land (58) is 0.05 ~ 6.0 mm; The width of internal tooth bottom surface (57) is 0.05 ~ 6.0 mm; The radius of interior tooth top external arc (66) is 0.20 ~ 0.50mm; The radius of external arc at the bottom of internal tooth (63) is 0.20 ~ 0.50mm; The radius of interior tooth top Inner arc (64) is 0.20 ~ 0.50mm; The radius of Inner arc at the bottom of internal tooth (65) is 0.20 ~ 0.50mm; Outside internal tooth bottom surface, the radius of transition arc (67) is 0.15 ~ 0.30mm; In internal tooth bottom surface, the radius of transition arc (68) is 0.15 ~ 0.30mm; In interior crest top land, the radius of transition arc (69) is 0.15 ~ 0.30mm; In interior crest top land, the radius of transition arc (69) is 0.15 ~ 0.30mm; Angle between the axis that angle between the axis of interior bearing surface (52) and box cupling body (1) is less than interior spigot surface (55) and box cupling body (1) is 2 ° ~ 6 °.
5. cambered surface shoulder type as claimed in claim 1 becomes tooth wide wedge type box cupling structure, it is characterized in that: the radius of described interior transition arc (48) is 0.3 ~ 2.5mm, and the central angle number of degrees that interior transition arc (48) is corresponding are 65 ° ~ 80 °; The radius of described interior sealing circular arc (46) is 0.7 ~ 2.5mm, and the central angle number of degrees of interior sealing circular arc (46) correspondence are 75 ° ~ 85 °; Described interior sealing inclined-plane (44) is 60 ° ~ 80 ° with the inner hole wall angulation of box cupling shoulder (1.2).
6. a cambered surface shoulder type becomes tooth wide wedged-shaped oil film well casing structure, comprise oil well pipe body (2), the two ends outer wall of oil well pipe body (2) is oil well pipe external thread section (2.1), oil well pipe shoulder (2.2) is provided with between two sections of oil well pipe external thread sections (2.1), on direction by the portion wherein, both ends of oil well pipe body (2), the facewidth of described oil well pipe external thread section (2.1) is in reducing setting gradually, the space width of oil well pipe external thread section (2.1) is in increasing setting gradually, the difference of adjacent two facewidth is equal with the difference of adjacent two space widths, the height of each tooth of oil well pipe external thread section (2.1) is equal, the tapering of oil well pipe external thread section (2.1) is 1:16 ~ 1:24, on the longitudinal cross-section of oil well pipe body (2), each tooth on oil well pipe external thread section (2.1) is wedge shape, is equipped with barb in the both sides, top of each tooth, the middle top of each tooth on oil well pipe external thread section (2.1) is outer crest top land (26), the inner side of outer crest top land (26) is provided with outer tooth top inner plane (20), the outside of outer crest top land (26) is provided with outer tooth top outerplanar (23), outer tooth top inner plane (20) is connected by transition arc (37) in outer crest top land with between outer crest top land (26), outer tooth top outerplanar (23) is connected by the outer transition arc (36) of outer crest top land with between outer crest top land (26), it is external tooth bottom surface (27) in the middle part of teeth groove, external tooth bottom surface (27) is taper seat, outer crest top land (26) is taper seat, and outer crest top land (26), the tapering of external tooth bottom surface (27) is equal with the tapering of oil well pipe external thread section (2.1), the inner side of external tooth bottom surface (27) is provided with inner plane at the bottom of external tooth (25), the outside of external tooth bottom surface (27) is provided with outerplanar at the bottom of external tooth (22), the lateral wall of each tooth is provided with outer spigot surface (24), outer spigot surface (24) is 79 ° ~ 85 ° with the axis angulation of oil well pipe body (2), the inside wall of each tooth is provided with outer bearing surface (21), outer bearing surface (21) is 76 ° ~ 82 ° with the axis angulation of oil well pipe body (2), be connected by transition arc (38) in external tooth bottom surface between external tooth bottom surface (27) with inner plane at the bottom of external tooth (25), be connected by transition arc (39) outside external tooth bottom surface between external tooth bottom surface (27) with outerplanar at the bottom of external tooth (22), be connected by external arc (35) at the bottom of external tooth between outerplanar at the bottom of external tooth (22) with outer bearing surface (21), be connected by the left inside circular arc of outer tooth top (34) between outer bearing surface (21) with outer tooth top inner plane (20), be connected by Inner arc (33) at the bottom of external tooth between inner plane at the bottom of external tooth (25) with outer spigot surface (24), be connected by outer tooth top external arc (32) between outer spigot surface (24) with outer tooth top outerplanar (23), inner plane at the bottom of internal tooth (51) is 10 ° ~ 20 ° with the axis angulation of box cupling body (1), outer tooth top outerplanar (23) is 10 ° ~ 20 ° with the axis angulation of oil well pipe body (2), outerplanar at the bottom of external tooth (22) is 7 ° ~ 17 ° with the axis angulation of oil well pipe body (2), outer tooth top inner plane (20) is 7 ° ~ 17 ° with the axis angulation of oil well pipe body (2), and on the longitudinal cross-section of oil well pipe body (2), be positioned at the outer bearing surface (21) of outermost end and outer transition arc (47) rounding off, the center of circle of outer transition arc (47) is positioned at the outside of oil well pipe external thread section (2.1) length direction corresponding thereto, outer transition arc (47) and external seal circular arc (45) rounding off, the oil well pipe external thread section (2.1) that the center of circle of external seal circular arc (45) is positioned at corresponding thereto is inner, external seal circular arc (45) and external seal inclined-plane (43) rounding off, external seal inclined-plane (43) is crossing in obtuse angle with outer transition face (41), outer transition face (41) is crossing in obtuse angle with the inner hole wall of oil well pipe external thread section (2.1), external seal inclined-plane (43) is crossing in obtuse angle with the inner hole wall of oil well pipe external thread section (2.1).
7. cambered surface shoulder type as claimed in claim 6 becomes tooth wide wedged-shaped oil film well casing structure, it is characterized in that: the tapering of described oil well pipe external thread section (2.1) is 1:18 ~ 1:20.
8. cambered surface shoulder type as claimed in claim 6 becomes tooth wide wedged-shaped oil film well casing structure, it is characterized in that: described oil well pipe external thread section (2.1) number of threads is 12 ~ 30; Outside buckle teeth facewidth width is: 1.8 ~ 3.2mm; Outer spigot surface pitch is: the outside buckle teeth facewidth is multiplied by the multiple of the outside buckle teeth facewidth, and outer spigot surface pitch is 3.96 ~ 9.60mm, and the multiple of the described outside buckle teeth facewidth is 2.2 ~ 3.0; Outer bearing surface pitch is: external screw thread total length deducts 2 times of outside buckle teeth facewidth/total button number and deducts 1; Outside buckle teeth groove width is: outer spigot surface pitch deducts the outside buckle teeth facewidth; Outer tooth depth is: 1.5 ~ 2.5mm.
9. cambered surface shoulder type as claimed in claim 6 becomes tooth wide wedged-shaped oil film well casing structure, and it is characterized in that: on the longitudinal cross-section of oil well pipe body (2), the first buckle teeth of oil well pipe external thread section (2.1) is wide is 1.8 ~ 3.2mm; The tooth depth of each tooth of oil well pipe external thread section (2.1) is 1.5 ~ 2.5mm; The width of outer tooth top inner plane (20) is 0.5 ~ 3.0 mm; The width of outer bearing surface (21) is 0.5 ~ 2.0 mm; The width of outerplanar at the bottom of external tooth (22) is 0.5 ~ 3.0 mm; The width of outer tooth top outerplanar (23) is 0.5 ~ 3.0 mm; The width of outer spigot surface (24) is 0.5 ~ 2.0 mm; The width of inner plane at the bottom of external tooth (25) is 0.5 ~ 3.0 mm; The width of outer crest top land (26) is 0.05 ~ 6.0 mm; The width of external tooth bottom surface (27) is 0.05 ~ 6.0 mm; The radius of outer tooth top external arc (32) is 0.20 ~ 0.50mm; The radius of Inner arc at the bottom of external tooth (33) is 0.20 ~ 0.50mm; The radius of the left inside circular arc of outer tooth top (34) is 0.20 ~ 0.50mm; The radius of external arc at the bottom of external tooth (35) is 0.20 ~ 0.50mm; The radius of the outer transition arc (36) of outer crest top land is 0.15 ~ 0.30mm; In outer crest top land, the radius of transition arc (37) is 0.15 ~ 0.30mm; In external tooth bottom surface, the radius of transition arc (38) is 0.15 ~ 0.30mm; Outside external tooth bottom surface, the radius of transition arc (39) is 0.15 ~ 0.30mm; Angle between outer bearing surface (21) and oil well pipe body (2) the axis angle be less than between outer spigot surface (24) and oil well pipe body (2) axis is 2 ° ~ 6 °.
10. cambered surface shoulder type as claimed in claim 6 becomes tooth wide wedged-shaped oil film well casing structure, it is characterized in that: the radius of described outer transition arc (47) is 0.5 ~ 0.25mm, and the central angle number of degrees that outer transition arc (47) is corresponding are 65 ° ~ 80 °; The radius of external seal circular arc (45) is 0.7 ~ 0.25mm, and the central angle number of degrees that outer transition arc (47) is corresponding are 65 ° ~ 80 °; External seal inclined-plane (43) angle crossing with the inner hole wall of oil well pipe external thread section (2.1) is 110 ° ~ 120 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310302200.8A CN103352661B (en) | 2013-07-16 | 2013-07-16 | Cambered surface circular bead type varied tooth-width wedge type coupling structure and oil well pipe structure |
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| CN201310302200.8A CN103352661B (en) | 2013-07-16 | 2013-07-16 | Cambered surface circular bead type varied tooth-width wedge type coupling structure and oil well pipe structure |
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| CN103352661B true CN103352661B (en) | 2015-05-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200961451Y (en) * | 2006-07-11 | 2007-10-17 | 天津钢管集团有限公司 | Tooth breadth variable inverse trapezia bush screw connection structure |
| CN200992958Y (en) * | 2007-01-16 | 2007-12-19 | 朴龙华 | Dual shoulder anti-torsion joint |
| CN202000916U (en) * | 2011-04-25 | 2011-10-05 | 达力普石油专用管有限公司 | Offset-thread oil casing with anti-torque shoulder |
| US8151461B2 (en) * | 2003-03-07 | 2012-04-10 | Vallourec Mannesmann Oil & Gas France | Method for producing a threaded tubular connection sealed by radial expansion |
| 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 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8151461B2 (en) * | 2003-03-07 | 2012-04-10 | Vallourec Mannesmann Oil & Gas France | Method for producing a threaded tubular connection sealed by radial expansion |
| CN200961451Y (en) * | 2006-07-11 | 2007-10-17 | 天津钢管集团有限公司 | Tooth breadth variable inverse trapezia bush screw connection structure |
| CN200992958Y (en) * | 2007-01-16 | 2007-12-19 | 朴龙华 | Dual shoulder anti-torsion joint |
| CN202000916U (en) * | 2011-04-25 | 2011-10-05 | 达力普石油专用管有限公司 | Offset-thread oil casing with anti-torque shoulder |
| 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 |
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