CN103321586B - Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure - Google Patents
Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure Download PDFInfo
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- CN103321586B CN103321586B CN201310296656.8A CN201310296656A CN103321586B CN 103321586 B CN103321586 B CN 103321586B CN 201310296656 A CN201310296656 A CN 201310296656A CN 103321586 B CN103321586 B CN 103321586B
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Abstract
The invention discloses a curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and an oil well pipe structure which are used in the petroleum steel pipe industry. The outer plane of an inner tooth crest of the most inner side is connected with a first inner sealing surface in the longitudinal section of a coupling body, and the first inner sealing surface is in smooth transition with an inner transition circular arc. The inner transition circular arc is in smooth transition with a second inner sealing surface which is in smooth transition with an inner ledge crest circular arc. The inner ledge crest circular arc is in smooth transition with a third inner sealing surface which is intersected with a coupling ledge inner hole wall by an acute angle. According to the curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and the oil well pipe structure, the structures of the sealing surfaces of cone-shaped structures a V-shaped torque-resistance ledge are added on a threaded end, in the situation of complete clamping, match of the sealing surfaces of wedge-shaped threads and the cone-shaped structures and the V-shaped torque-resistance ledge greatly increases the sealing performance, the bend resistance capacity, the compressive load capacity and the high torque resistance performance of threaded connectors.
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, the flat conical seal (contact) face of curved surface shoulder 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 flat conical seal (contact) face of curved surface shoulder that tooth wide wedge type box cupling respective outer side edges uses with the flat conical seal (contact) face of curved surface shoulder and become tooth wide wedged-shaped oil film well casing structure.
According to technical scheme provided by the invention, the flat conical seal (contact) face of described a kind of curved surface shoulder 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 tooth top outerplanar being positioned at inner side is connected with the first inner sealing surface, first inner sealing surface and interior transition arc rounding off, interior transition arc and the second inner sealing surface rounding off, second inner sealing surface and interior shoulder top arc smooth transition, interior shoulder tip circle arc and the 3rd inner sealing surface rounding off, the 3rd inner sealing surface and box cupling shoulder inner hole wall are 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 length of described first inner sealing surface is 6 ~ 10mm, and its tapering is 1:8 ~ 1:12; The radius of interior transition arc is 0.3 ~ 1.0mm, and the central angle number of degrees that interior transition arc is corresponding are 20 ~ 40 °; The radius of interior shoulder tip circle arc is 0.5mm ~ 2.0mm, and the central angle number of degrees that interior shoulder tip circle arc is corresponding are 90 ~ 100 °; The angle of the axis of the second inner sealing surface and box cupling body is 60 ~ 80 °; The angle of the axis of the 3rd inner sealing surface and box cupling body is 60 ~ 80 °.
The flat conical seal (contact) face of a kind of curved surface shoulder 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 outer tooth top Inner arc 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 outerplanar at the bottom of the external tooth of outermost end to be connected with the first external seal face, first external seal face and outer transition arc rounding off, outer transition arc and the second external seal face rounding off, second external seal face and outer shoulder tip circle arc rounding off, outer shoulder tip circle arc and the 3rd external seal face rounding off, the 3rd external seal face is connected with inboard wall of tube body transition face, and inboard wall of tube body transition face is connected with oil well pipe external thread section inner hole wall.
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 outer tooth top Inner arc 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, on the longitudinal cross-section of oil well pipe body, the length in described first external seal face is 6 ~ 10mm, and its tapering is 1:8 ~ 1:12; The radius of outer shoulder tip circle arc is 0.5mm ~ 2.0mm, and the central angle number of degrees that outer shoulder tip circle arc is corresponding are 90 ~ 100 °; The radius of outer transition arc is 0.3mm ~ 1.0mm, and the central angle number of degrees that outer transition arc is corresponding are 20 ~ 40 °; The angle of the second external seal face and oil well pipe body axis is 60 ~ 80 °; The angle of the 3rd external seal face and oil well pipe body axis is 60 ~ 80 °; The length of inboard wall of tube body transition face is 5 ~ 20mm.
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 is made to contact completely with tooth side under playing the tight state of high pulling torque machine, and its each profile of tooth tooth side is evenly distributed under interference fit stress, effectively improve its sealing performance and bonding strength.
2. the tooth form bearing surface of form of thread and the pitch of tooth form spigot surface are improved to unequal, and spigot surface pitch is greater than bearing surface pitch, its tooth width increases gradually, alveolus width reduces gradually to occur becoming the wide helicitic texture form of tooth, tooth side lead angle angle simultaneously both it is different, shape is at a certain angle, two tooth sides form the wedge shape conical surface, the profile of tooth of internal and external threads coordinates the wedge thread fit structure just defining the wedge shape conical surface and the wedge shape conical surface, have different significantly from two parallel tooth sides of API buttress thread, can significantly improve its internal and external threads joint coordinate after bonding strength, sealing performance and bending resistance and cross torsional performance.
3. the tooth form bearing surface of form of thread and the pitch of tooth form spigot surface are improved to unequal, and spigot surface pitch is greater than the wide helicitic texture form of change tooth of bearing surface pitch, the flute profile width that internal and external screw thread starts when screwing near end face is all less than space width, make-up is very simple and convenient has stopped thread alternating phenomenon, effectively improves the quality of products and operating efficiency.
4. the wide thread forms of change tooth of bearing surface pitch is greater than owing to have employed spigot surface pitch, various impacts when the difference effectively reduced because of body and box cupling ovality coordinates internal and external threads, particularly serve upper shackle fast and repeatedly go up shackle screw thread and can not occur to scratch and damage phenomenon, significantly improve product percent of pass.
5. adopt wedge type and become the wide Design of Screw Thread structure of tooth and will effectively improve anti-tripping performance, tensile loads performance, the bending resistance of nipple, the high composite bearing ability of effective raising nipple, can provide suitable with body in press drag and bonding strength.
6. at the bottom of the tooth top of screw thread and tooth, have employed the planar design of three different taperings or angle, but not cambered surface, reduce difficulty of processing, reach plane and contact with interplanar, eliminate internal and external threads under the factor impacts such as different ovalitys, improve the impact of interference fit double thread profile of tooth sealing performance.
7. in the middle of pipe end and box cupling, increase the radial seal structure of the tapered plane of metal and metal, reached the effect of high sealing performance under counter-bending state by the interference fit of inside/outside sealing surface diameter.
8. in the middle of pipe end and box cupling, increase V-structure torque shoulder, improve its torque resistant performance and incompressible load performance;
9. increase the step plane length of box cupling, intend the body bonding strength and the bending resistance that increase the connection of box cupling two ends;
10. 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;
11. the present invention are applicable to using in dark/ultradeep well, medium/high force feed, 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.
The flat conical seal (contact) face of a kind of curved surface shoulder 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 tooth top outerplanar 53 being positioned at inner side is connected with the first inner sealing surface 72, first inner sealing surface 72 and interior transition arc 78 rounding off, interior transition arc 78 and the second inner sealing surface 74 rounding off, second inner sealing surface 74 and interior shoulder tip circle arc 76 rounding off, interior shoulder tip circle arc 76 and the 3rd inner sealing surface 80 rounding off, the 3rd inner sealing surface 80 is sharp angle with box cupling shoulder 1.2 inner hole wall.
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 length of described first inner sealing surface 72 is 6 ~ 10mm, and its tapering is 1:8 ~ 1:12; The radius of interior transition arc 78 is 0.3 ~ 1.0mm, and the central angle number of degrees of interior transition arc 78 correspondence are 20 ~ 40 °; The radius of interior shoulder tip circle arc 76 is 0.5mm ~ 2.0mm, and the central angle number of degrees of interior shoulder tip circle arc 76 correspondence are 90 ~ 100 °; Second inner sealing surface 74 is 60 ~ 80 ° with the angle of the axis of box cupling body 1; 3rd inner sealing surface 74 is 60 ~ 80 ° with the angle of the axis of box cupling body 1.
The flat conical seal (contact) face of a kind of curved surface shoulder 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 outer tooth top Inner arc 34 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 outerplanar 22 at the bottom of the external tooth of outermost end to be connected with the first external seal face 73, first external seal face 73 and outer transition arc 79 rounding off, outer transition arc 79 and the second external seal face 75 rounding off, second external seal face 75 and outer shoulder tip circle arc 77 rounding off, outer shoulder tip circle arc 77 and the 3rd external seal face 81 rounding off, 3rd external seal face 81 is connected with inboard wall of tube body transition face 83, and inboard wall of tube body transition face 83 is connected with oil well pipe external thread section 2.1 inner hole wall.
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 outer tooth top Inner arc 34 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, on the longitudinal cross-section of oil well pipe body 2, the length in described first external seal face 73 is 6 ~ 10mm, and its tapering is 1:8 ~ 1:12; The radius of outer shoulder tip circle arc 77 is 0.5mm ~ 2.0mm, and the central angle number of degrees of outer shoulder tip circle arc 77 correspondence are 90 ~ 100 °; The radius of outer transition arc 79 is 0.3mm ~ 1.0mm, and the central angle number of degrees of outer transition arc 79 correspondence are 20 ~ 40 °; Second external seal face 75 is 60 ~ 80 ° with the angle of oil well pipe body 2 axis; 3rd external seal face 81 is 60 ~ 80 ° with the angle of oil well pipe body 2 axis; The length of inboard wall of tube body transition face 83 is 5 ~ 20mm.
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.
The length of 14. inner sealing surfaces 72 is less than or equal to the length in external seal face 73, remains on the margin of tolerance of 0 ~ 0.10mm between them, and their tapering is identical, reaches complete sealing performance requirement to meet after interference fit.
The thickness of 15. inner sealing surfaces 72 is equal with the thickness in external seal face 73, interior transition arc 78 is all equal with the corresponding central angle number of degrees with the radius of outer transition arc 79, and interior shoulder tip circle arc 76 is all equal with the corresponding central angle number of degrees with the radius of outer shoulder tip circle arc 77.
It is 0 ~ 0.5 ° with the supplementary angle of oil well pipe external thread section 2.1 inner hole wall angulation that 16. the 3rd inner sealing surfaces 80 and box cupling shoulder 1.2 inner hole wall angulation are less than or equal to the 3rd external seal face 81, it is 0 ~ 1.0 ° with the supplementary angle of oil well pipe external thread section 2.1 inner hole wall angulation that second inner sealing surface 74 and box cupling shoulder 1.2 inner hole wall angulation are less than or equal to the second external seal face 75, like this, inside and outside shoulder can be met and be issued to interference fit in the tight situation of machine, 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 (8)
1. the flat conical seal (contact) face of curved surface shoulder 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 tooth top outerplanar (53) being positioned at inner side is connected with the first inner sealing surface (72), first inner sealing surface (72) and interior transition arc (78) rounding off, interior transition arc (78) and the second inner sealing surface (74) rounding off, second inner sealing surface (74) and interior shoulder tip circle arc (76) rounding off, interior shoulder tip circle arc (76) and the 3rd inner sealing surface (80) rounding off, the 3rd inner sealing surface (80) and box cupling shoulder (1.2) inner hole wall are sharp angle,
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.
2. the flat conical seal (contact) face of curved surface shoulder 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. the flat conical seal (contact) face of curved surface shoulder 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 °.
4. the flat conical seal (contact) face of curved surface shoulder as claimed in claim 1 becomes tooth wide wedge type box cupling structure, it is characterized in that: the length of described first inner sealing surface (72) is 6 ~ 10mm, and its tapering is 1:8 ~ 1:12; The radius of interior transition arc (78) is 0.3 ~ 1.0mm, and the central angle number of degrees that interior transition arc (78) is corresponding are 20 ° ~ 40 °; The radius of interior shoulder tip circle arc (76) is 0.5mm ~ 2.0mm, and the central angle number of degrees of interior shoulder tip circle arc (76) correspondence are 90 ~ 100 °; Second inner sealing surface (74) is 60 ~ 80 ° with the angle of the axis of box cupling body (1); 3rd inner sealing surface (74) is 60 ~ 80 ° with the angle of the axis of box cupling body (1).
5. the flat conical seal (contact) face of curved surface shoulder 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 outer tooth top Inner arc (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 outerplanar (22) at the bottom of the external tooth of outermost end to be connected with the first external seal face (73), first external seal face (73) and outer transition arc (79) rounding off, outer transition arc (79) and the second external seal face (75) rounding off, second external seal face (75) and outer shoulder tip circle arc (77) rounding off, outer shoulder tip circle arc (77) and the 3rd external seal face (81) rounding off, 3rd external seal face (81) is connected with inboard wall of tube body transition face (83), inboard wall of tube body transition face (83) is connected with oil well pipe external thread section (2.1) inner hole wall,
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.
6. the flat conical seal (contact) face of curved surface shoulder as claimed in claim 5 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.
7. the flat conical seal (contact) face of curved surface shoulder as claimed in claim 5 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 outer tooth top Inner arc (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 °.
8. the flat conical seal (contact) face of curved surface shoulder as claimed in claim 5 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 length in described first external seal face (73) is 6 ~ 10mm, and its tapering is 1:8 ~ 1:12; The radius of outer shoulder tip circle arc (77) is 0.5mm ~ 2.0mm, and the central angle number of degrees of outer shoulder tip circle arc (77) correspondence are 90 ~ 100 °; The radius of outer transition arc (79) is 0.3mm ~ 1.0mm, and the central angle number of degrees that outer transition arc (79) is corresponding are 20 ° ~ 40 °; Second external seal face (75) is 60 ~ 80 ° with the angle of oil well pipe body (2) axis; 3rd external seal face (81) is 60 ~ 80 ° with the angle of oil well pipe body (2) axis; The length of inboard wall of tube body transition face (83) is 5 ~ 20mm.
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|---|---|---|---|
| CN201310296656.8A CN103321586B (en) | 2013-07-16 | 2013-07-16 | Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure |
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| CN201310296656.8A CN103321586B (en) | 2013-07-16 | 2013-07-16 | Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure |
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|---|---|---|---|---|
| CN109403877A (en) * | 2018-11-26 | 2019-03-01 | 中国石油大学(北京) | Oil pipe thread connector |
| CN109882088B (en) * | 2019-03-20 | 2022-02-18 | 上海海隆石油钻具有限公司 | Oil well pipe column connecting joint |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201318513Y (en) * | 2008-11-22 | 2009-09-30 | 衡阳华菱连轧管有限公司 | Oil pipe high-pressure gas seal connection structure |
| CN201650143U (en) * | 2009-12-03 | 2010-11-24 | 黄远斌 | Threaded connector for oil pipes and casing pipes |
| CN102395747A (en) * | 2009-04-17 | 2012-03-28 | 瓦卢莱克曼内斯曼油气法国公司 | Tubular component for drilling and operating hydrocarbon wells, and resulting threaded connection |
| CN202578555U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil casing joint |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7575255B2 (en) * | 2004-12-30 | 2009-08-18 | Hydril Llc | Wedge thread with high-angle metal seal |
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2013
- 2013-07-16 CN CN201310296656.8A patent/CN103321586B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201318513Y (en) * | 2008-11-22 | 2009-09-30 | 衡阳华菱连轧管有限公司 | Oil pipe high-pressure gas seal connection structure |
| CN102395747A (en) * | 2009-04-17 | 2012-03-28 | 瓦卢莱克曼内斯曼油气法国公司 | Tubular component for drilling and operating hydrocarbon wells, and resulting threaded connection |
| CN201650143U (en) * | 2009-12-03 | 2010-11-24 | 黄远斌 | Threaded connector for oil pipes and casing pipes |
| CN202578555U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil casing joint |
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| CN103321586A (en) | 2013-09-25 |
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