CN103362457B - Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure - Google Patents
Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure Download PDFInfo
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- CN103362457B CN103362457B CN201310335231.3A CN201310335231A CN103362457B CN 103362457 B CN103362457 B CN 103362457B CN 201310335231 A CN201310335231 A CN 201310335231A CN 103362457 B CN103362457 B CN 103362457B
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Abstract
The invention discloses a cambered surface and plane sealed variable tooth wide coupling structure and an oil well pipe structure used in the petroleum steel pipe industry. On a longitudinal cross-section of a coupling body, an internal tooth crest outer circular arc located at the innermost end is in smooth transition with an internal transition cambered surface, the internal transition cambered surface is in smooth transition with an internal conical sealing surface, the internal beveled sealing surface is in smooth transition with an internal arc-shaped sealing surface, the internal arc-shaped sealing surface is in smooth transition with an internal circular bead vertex cambered surface, the internal circular bead vertex cambered surface is in smooth transition with an internal circular bead surface, and the internal circular bead surface is connected with an inner bore wall surface of a coupling circular bead through a fillet. According to the cambered surface and plane sealed variable tooth wide coupling structure and the oil well pipe structure, a metal-to-metal radial seal structure combining a conical surface with a cambered surface and a plane anti-torque circular bead are additionally arranged on the end portion of a thread of the coupling structure. Through the matching of the wedge-shaped thread, the conical surface and cambered surface radial seal structure and the anti-torque circular bead, the sealing performance, the anti-bending capability, the compression load resisting capability and the high anti-torque performance of the connection of thread connectors are remarkably enhanced.
Description
Technical field
The cambered surface and the plane sealing type that the invention discloses the use of a kind of oil drilling industry become tooth wide wedge type box cupling structure, and the cambered surface and the plane sealing type that the invention also discloses the use of a kind of oil drilling industry become tooth wide wedged-shaped oil film well casing structure.
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 that bending resistance, incompressible load-carrying ability and high resistance torsional performance all increase and plane sealing type become tooth wide wedge type box cupling structure.
Another object of the present invention is to provide cambered surface that a kind of and above-mentioned box cupling respective outer side edges uses and plane sealing type becomes tooth wide wedged-shaped oil film well casing structure.
According to technical scheme provided by the invention, described a kind of cambered surface and plane sealing type become tooth wide wedge type box cupling structure, comprise box cupling body, and 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 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, be positioned at tooth top external arc and the transition cambered surface rounding off of inner terminal position, interior transition cambered surface and inner conical sealing surface rounding off, inner conical sealing surface and arc sealing surface rounding off, arc sealing surface and interior shoulder summit cambered surface rounding off, interior shoulder summit cambered surface and interior circular bead surface rounding off, be connected by fillet between interior circular bead surface and the endoporus wall of box cupling shoulder.
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; The first buckle teeth well width of coupling inner thread section is 1.8 ~ 3.2mm; The spigot surface pitch of coupling inner thread section is 3.96 ~ 9.60mm; The bearing surface pitch of coupling inner thread section equals: (internal thread total length deducts 2 times of first buckle teeth groove widths)/(total button number deducts 1); The first buckle teeth of coupling inner thread section is wide is: the spigot surface pitch of coupling inner thread section deducts the first buckle teeth groove width of coupling inner thread section; The tooth depth of coupling inner thread section 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, on the longitudinal cross-section of box cupling body, the radius of interior transition cambered surface is 2.0 ~ 6.0mm, and the central angle number of degrees corresponding to it are 10 ~ 15 °; The length of inner conical sealing surface is 4.0 ~ 8.0mm, and its tapering is 1:12 ~ 1:22; The radius of arc sealing surface is 5.0 ~ 10.0mm, and the central angle number of degrees corresponding to it are 15 ~ 25 °; The radius of interior shoulder summit cambered surface is 1.0 ~ 2.0mm, and the central angle number of degrees corresponding to it are 65 ~ 75 °; The endoporus wall angulation of interior circular bead surface and box cupling shoulder is 65 ~ 85 °; The inner end of arc sealing surface to box cupling shoulder endoporus wall between distance be 3.5 ~ 8.0mm; The supplementary angle of the line at arc sealing surface both ends and the endoporus wall institute angulation of box cupling shoulder is 15 ~ 25 °.
A kind of cambered surface and plane sealing type become 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 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 external arc at the bottom of the external tooth of outermost end and outer transition cambered surface rounding off, outer transition cambered surface and male-tapered sealing surface rounding off, male-tapered sealing surface and outer arcuate sealing surface rounding off, outer arcuate sealing surface and outer shoulder summit cambered surface rounding off, outer shoulder summit cambered surface and outer circular bead surface rounding off, outer circular bead surface and inwall bore hole flat face, inwall bore hole plane connects with inboard wall of tube body transition face, and inboard wall of tube body transition face connects with the endoporus 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; The first buckle teeth of oil well pipe external thread section is wide is 1.8 ~ 3.2mm; The spigot surface pitch of oil well pipe external thread section is 3.96 ~ 9.60mm; The bearing surface pitch of oil well pipe external thread section is: (it is wide that external screw thread total length deducts 2 times of first buckle teeth)/(total button number deducts 1); The first buckle teeth groove width of oil well pipe external thread section is: it is wide that outer spigot surface pitch deducts first buckle teeth; The tooth depth of oil well pipe external thread section 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, on the longitudinal cross-section of oil well pipe body, the radius of outer transition cambered surface is 2.0 ~ 6.0mm, and the central angle number of degrees corresponding to it are 10 ~ 15 °; The length of male-tapered sealing surface is 4.0 ~ 8.0mm, and its tapering is 1:12 ~ 1:22; The radius of outer arcuate sealing surface is 5.0 ~ 10.0mm, and the central angle number of degrees corresponding to it are 15 ~ 25 °; The radius of outer shoulder summit cambered surface is 1.0 ~ 2.0mm, and the central angle number of degrees corresponding to it are 65 ~ 75 °; The outer end of outer arcuate sealing surface is 3.5 ~ 8.0mm to the distance between inwall bore hole plane; Both ends line and the inwall bore hole plane angulation of outer arcuate sealing surface are 15 ~ 25 °; The length of inwall bore hole plane is 2 ~ 10mm; The length of inboard wall of tube body transition face is 2 ~ 10mm; The supplementary angle number of degrees of inwall bore hole plane and inboard wall of tube body transition face institute angulation are 10 ~ 20 °.
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. a kind of metal that an increase conical surface is combined with cambered surface in the middle of pipe end and box cupling and metallic radial hermetically-sealed construction, torque shoulder have employed planar configuration, to significantly improve high sealing performance, torque resistant performance and the bending resistance under the counter-bending state of nipple.
8. add its box cupling torque shoulder plane and the interior concordant design of inboard wall of tube body employing simultaneously of box cupling shoulder plane length, effectively can reduce turbulent phenomenon when respective media is passed through in pipeline, energy loss is reduced to minimum.
9. the present invention is applicable to the Oil/gas Well use of deep-well, ultradeep well, high sealing performance requirement 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 and plane sealing type become 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 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, be positioned at tooth top external arc 66 and transition cambered surface 86 rounding off of inner terminal position, interior transition cambered surface 86 and inner conical sealing surface 76 rounding off, inner conical sealing surface 76 and arc sealing surface 78 rounding off, arc sealing surface 78 and interior shoulder summit cambered surface 80 rounding off, interior shoulder summit cambered surface 80 and interior circular bead surface 82 rounding off, be connected by fillet between interior circular bead surface 82 and the endoporus 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; The first buckle teeth well width of coupling inner thread section 1.1 is 1.8 ~ 3.2mm; The spigot surface pitch of coupling inner thread section 1.1 is 3.96 ~ 9.60mm; The bearing surface pitch of coupling inner thread section 1.1 equals: (internal thread total length deducts 2 times of first buckle teeth groove widths)/(total button number deducts 1); The first buckle teeth of coupling inner thread section 1.1 is wide is: the spigot surface pitch of coupling inner thread section 1.1 deducts the first buckle teeth groove width of coupling inner thread section 1.1; The tooth depth of coupling inner thread section 1.1 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, on the longitudinal cross-section of box cupling body 1, the radius of interior transition cambered surface 86 is 2.0 ~ 6.0mm, and the central angle number of degrees corresponding to it are 10 ~ 15 °; The length of inner conical sealing surface 76 is 4.0 ~ 8.0mm, and its tapering is 1:12 ~ 1:22; The radius of arc sealing surface 78 is 5.0 ~ 10.0mm, and the central angle number of degrees corresponding to it are 15 ~ 25 °; The radius of interior shoulder summit cambered surface 80 is: 1.0 ~ 2.0mm, and the central angle number of degrees corresponding to it are 65 ~ 75 °; Interior circular bead surface 82 is 65 ~ 85 ° with the endoporus wall angulation of box cupling shoulder 1.2; The inner end of arc sealing surface 78 to box cupling shoulder 1.2 endoporus wall between distance be 3.5 ~ 8.0mm; The supplementary angle of the line at arc sealing surface 78 both ends and the endoporus wall institute angulation of box cupling shoulder 1.2 is 15 ~ 25 °.
A kind of cambered surface and plane sealing type become 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 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 external arc 35 at the bottom of the external tooth of outermost end and outer transition cambered surface 87 rounding off, outer transition cambered surface 87 and male-tapered sealing surface 77 rounding off, male-tapered sealing surface 77 and outer arcuate sealing surface 79 rounding off, outer arcuate sealing surface 79 and outer shoulder summit cambered surface 81 rounding off, outer shoulder summit cambered surface 81 and outer circular bead surface 83 rounding off, outer circular bead surface 83 connects with inwall bore hole plane 75, inwall bore hole plane 75 connects with inboard wall of tube body transition face 89, inboard wall of tube body transition face 89 connects with the endoporus 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; The first buckle teeth of oil well pipe external thread section 2.1 is wide is 1.8 ~ 3.2mm; The spigot surface pitch of oil well pipe external thread section 2.1 is 3.96 ~ 9.60mm; The bearing surface pitch of oil well pipe external thread section 2.1 is: (it is wide that external screw thread total length deducts 2 times of first buckle teeth)/(total button number deducts 1); The first buckle teeth groove width of oil well pipe external thread section 2.1 is: it is wide that outer spigot surface pitch deducts first buckle teeth; The tooth depth of oil well pipe external thread section 2.1 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, on the longitudinal cross-section of oil well pipe body 2, the radius of outer transition cambered surface 87 is 2.0 ~ 6.0mm, and the central angle number of degrees corresponding to it are 10 ~ 15 °; The length of male-tapered sealing surface 77 is 4.0 ~ 8.0mm, and its tapering is 1:12 ~ 1:22; The radius of outer arcuate sealing surface 79 is 5.0 ~ 10.0mm, and the central angle number of degrees corresponding to it are 15 ~ 25 °; The radius of outer shoulder summit cambered surface 81 is 1.0 ~ 2.0mm, and the central angle number of degrees corresponding to it are 65 ~ 75 °; The outer end of outer arcuate sealing surface 79 is 3.5 ~ 8.0mm to the distance between inwall bore hole plane 75; Both ends line and inwall bore hole plane 75 angulation of outer arcuate sealing surface 79 are 15 ~ 25 °; The length of inwall bore hole plane 75 is 2 ~ 10mm; The length of inboard wall of tube body transition face 89 is 2 ~ 10mm; Inwall bore hole plane 75 is 10 ~ 20 ° with the supplementary angle number of degrees of inboard wall of tube body transition face 89 angulations.
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 center of circle angle elements of 12. outer tooth top external arc 32 and outer tooth top Inner arc 34 are identical, radius and their corresponding center of circle angle elements 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 center of circle angle elements 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 center of circle angle elements 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 outer end of 14. inner conical sealing surfaces 76 is inner sealing surface to the inner end of interior shoulder summit cambered surface 80, the inner end of male-tapered sealing surface 77 to outer shoulder summit cambered surface 81 left part between be external seal face; The length of inner sealing surface is less than or equal to the length in external seal face, and its Deviation Control, in the scope of 0.0 ~ 0.10mm, is intended meeting axial distance interference fit, played torque resistant performance.
The inner end of the distance between the outer end of 15. outer arcuate sealing surfaces 79 to inwall bore hole plane 75 and arc sealing surface 78 to box cupling shoulder 1.2 endoporus wall between required distance identical, concordant with inwall bore hole plane 75 to reach box cupling shoulder plane, keep same plane, reduce the passage resistance of fluid in body.
The radius of 16. inner conical sealing surfaces 76 is less than or equal to the radius of male-tapered sealing surface 77, their axial distance Deviation Control is in the scope of 0.0 ~ 0.10mm, radial diameter footpath Deviation Control is at 0.20 ~ 1.00mm, and axially satisfied and radial interference fit reaches high sealing performance requirement.
17. arc sealing surfaces 78 and outer arcuate sealing surface 79, arc sealing surface angle 84 require identical with outer arcuate sealing surface angle 85, its radial outer diameter controls and inside and outside conical seal (contact) face coordinate require identical.
In 18., the radius of shoulder summit cambered surface 80 is greater than or equal to outer shoulder summit cambered surface 81, and its Deviation Control, in the scope of 0.1 ~ 0.2mm, is intended meeting its summit after interference fit and is not damaged.
The supplementary angle number of degrees being greater than or equal to inwall bore hole plane 75 and inboard wall of tube body transition face 89 angulations of the endoporus wall angulation of circular bead surface 82 and box cupling shoulder 1.2 in 19., its deviation all controls the scope at 0.5 ~ 1.5 °, with 0.5 ~ 1.0 ° of the best, 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 (8)
1. cambered surface and plane sealing type become a tooth wide wedge type box cupling structure, comprise box cupling body (1), and 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), be positioned at the tooth top external arc (66) of inner terminal position and transition cambered surface (86) rounding off, interior transition cambered surface (86) and inner conical sealing surface (76) rounding off, inner conical sealing surface (76) and arc sealing surface (78) rounding off, arc sealing surface (78) and interior shoulder summit cambered surface (80) rounding off, interior shoulder summit cambered surface (80) and interior circular bead surface (82) rounding off, be connected by fillet between interior circular bead surface (82) with the endoporus wall of box cupling shoulder (1.2),
The number of threads of described coupling inner thread section (1.1) is 12 ~ 30; The first buckle teeth well width of coupling inner thread section (1.1) is 1.8 ~ 3.2mm; The spigot surface pitch of coupling inner thread section (1.1) is 3.96 ~ 9.60mm; The bearing surface pitch of coupling inner thread section (1.1) equals: (internal thread total length deducts 2 times of first buckle teeth groove widths)/(total button number deducts 1); The first buckle teeth of coupling inner thread section (1.1) is wide is: the spigot surface pitch of coupling inner thread section (1.1) deducts the first buckle teeth groove width of coupling inner thread section (1.1); The tooth depth of coupling inner thread section (1.1) is 1.5 ~ 2.5mm.
2. cambered surface as claimed in claim 1 and plane sealing type become 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 as claimed in claim 1 and plane sealing type become 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. cambered surface as claimed in claim 1 and plane sealing type become tooth wide wedge type box cupling structure, and it is characterized in that: on the longitudinal cross-section of box cupling body (1), the radius of interior transition cambered surface (86) is 2.0 ~ 6.0mm, and the central angle number of degrees corresponding to it are 10 ~ 15 °; The length of inner conical sealing surface (76) is 4.0 ~ 8.0mm, and its tapering is 1:12 ~ 1:22; The radius of arc sealing surface (78) is 5.0 ~ 10.0mm, and the central angle number of degrees corresponding to it are 15 ~ 25 °; The radius of interior shoulder summit cambered surface (80) is: 1.0 ~ 2.0mm, and the central angle number of degrees corresponding to it are 65 ~ 75 °; Interior circular bead surface (82) is 65 ~ 85 ° with the endoporus wall angulation of box cupling shoulder (1.2); The inner end of arc sealing surface (78) to box cupling shoulder (1.2) endoporus wall between distance be 3.5 ~ 8.0mm; The supplementary angle of the line at arc sealing surface (78) both ends and the endoporus wall institute angulation of box cupling shoulder (1.2) is 15 ~ 25 °.
5. a cambered surface and plane sealing type become 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 external arc (35) at the bottom of the external tooth of outermost end and outer transition cambered surface (87) rounding off, outer transition cambered surface (87) and male-tapered sealing surface (77) rounding off, male-tapered sealing surface (77) and outer arcuate sealing surface (79) rounding off, outer arcuate sealing surface (79) and outer shoulder summit cambered surface (81) rounding off, outer shoulder summit cambered surface (81) and outer circular bead surface (83) rounding off, outer circular bead surface (83) connects with inwall bore hole plane (75), inwall bore hole plane (75) connects with inboard wall of tube body transition face (89), inboard wall of tube body transition face (89) connects with the endoporus wall of oil well pipe external thread section (2.1),
The number of threads of described oil well pipe external thread section (2.1) is 12 ~ 30; The first buckle teeth of oil well pipe external thread section (2.1) is wide is 1.8 ~ 3.2mm; The spigot surface pitch of oil well pipe external thread section (2.1) is 3.96 ~ 9.60mm; The bearing surface pitch of oil well pipe external thread section (2.1) is: (it is wide that external screw thread total length deducts 2 times of first buckle teeth)/(total button number deducts 1); The first buckle teeth groove width of oil well pipe external thread section (2.1) is: it is wide that outer spigot surface pitch deducts first buckle teeth; The tooth depth of oil well pipe external thread section (2.1) is 1.5 ~ 2.5mm.
6. cambered surface as claimed in claim 5 and plane sealing type become 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. cambered surface as claimed in claim 5 and plane sealing type become 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 °.
8. cambered surface as claimed in claim 5 and plane sealing type become tooth wide wedged-shaped oil film well casing structure, it is characterized in that: on the longitudinal cross-section of oil well pipe body (2), the radius of outer transition cambered surface (87) is 2.0 ~ 6.0mm, and the central angle number of degrees corresponding to it are 10 ~ 15 °; The length of male-tapered sealing surface (77) is 4.0 ~ 8.0mm, and its tapering is 1:12 ~ 1:22; The radius of outer arcuate sealing surface (79) is 5.0 ~ 10.0mm, and the central angle number of degrees corresponding to it are 15 ~ 25 °; The radius of outer shoulder summit cambered surface (81) is 1.0 ~ 2.0mm, and the central angle number of degrees corresponding to it are 65 ~ 75 °; The outer end of outer arcuate sealing surface (79) is 3.5 ~ 8.0mm to the distance between inwall bore hole plane (75); Both ends line and inwall bore hole plane (75) angulation of outer arcuate sealing surface (79) are 15 ~ 25 °; The length of inwall bore hole plane (75) is 2 ~ 10mm; The length of inboard wall of tube body transition face (89) is 2 ~ 10mm; Inwall bore hole plane (75) is 10 ~ 20 ° with the supplementary angle number of degrees of inboard wall of tube body transition face (89) institute angulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310335231.3A CN103362457B (en) | 2013-08-03 | 2013-08-03 | Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310335231.3A CN103362457B (en) | 2013-08-03 | 2013-08-03 | Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure |
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| Publication Number | Publication Date |
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| CN103362457A CN103362457A (en) | 2013-10-23 |
| CN103362457B true CN103362457B (en) | 2015-07-22 |
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| EP3260649B1 (en) * | 2016-06-21 | 2019-12-18 | Energy Frontier Solutions S.L. | Threaded joint for oil and gas pipes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7086669B2 (en) * | 2002-11-07 | 2006-08-08 | Grant Prideco, L.P. | Method and apparatus for sealing radially expanded joints |
| FR2852076B1 (en) * | 2003-03-07 | 2005-06-10 | Vallourec Mannesmann Oil & Gas | METHOD FOR MAKING A RADIALLY EXPANSION-SEALED TUBULAR THREAD SEAL |
| US7585002B2 (en) * | 2004-04-21 | 2009-09-08 | Baker Hughes Incorporated | Expandable tubular connection |
| FR2874988B1 (en) * | 2004-09-09 | 2008-05-02 | Vallourec Mannesmann Oil & Gas | MALE ELEMENT FOR A TUBULAR THREADED SEAL AFTER DIAMETER EXPANSION |
| US8177262B2 (en) * | 2005-07-28 | 2012-05-15 | Hydril Company Lp | Mid-seal for expandable connections |
| US7798536B2 (en) * | 2005-08-11 | 2010-09-21 | Weatherford/Lamb, Inc. | Reverse sliding seal for expandable tubular connections |
| 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 |
| FR2944553B1 (en) * | 2009-04-17 | 2011-06-03 | Vallourec Mannesmann Oil & Gas | TUBULAR COMPONENT FOR DRILLING AND OPERATING HYDROCARBON WELLS AND RESULTING THREAD |
| CN202380985U (en) * | 2011-09-16 | 2012-08-15 | 中国石油化工股份有限公司 | Tubular air seal thread joint |
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