CN104131788B - High antitorque hermetically sealed drill rod threaded nipple - Google Patents
High antitorque hermetically sealed drill rod threaded nipple Download PDFInfo
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- CN104131788B CN104131788B CN201410349698.8A CN201410349698A CN104131788B CN 104131788 B CN104131788 B CN 104131788B CN 201410349698 A CN201410349698 A CN 201410349698A CN 104131788 B CN104131788 B CN 104131788B
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Abstract
The invention discloses a kind of high antitorque hermetically sealed drill rod threaded nipple, including male connection and female adapter；The face, female adapter main side of female adapter is the anchor ring with inclination angle, and female thread stomidium portion is conical bore；Outer circular bead surface in male connection is the anchor ring with inclination angle, the taper pipe thread base portion of male connection is elliptical arc surface, the a length of b of oval cross section major semiaxis of this elliptical arc surface, the oval cross section minor axis length of elliptical arc surface is 2a, and the ratio 2a/b of this minor axis length 2a and major semiaxis length b is equal to the conical bore tapering in female thread stomidium portion；Described leading portion external screw thread and pitch T of leading portion female thread2More than or equal to back segment external screw thread and pitch T of back segment female thread1.It can not only be effectively improved the torque resistant ability of screw on tool joint, and sealing surface coordinates reliable, is in sealing contact elastic deformation stable, seals tight.It is very suitable in exploration and the exploitation of oil/gas deep well, ultradeep well and Holes of Complicated Wells.
Description
Technical field
The present invention relates to a kind of screw connection for oil and gas exploration Yu the oil drill rocker of exploitation, particularly relate to the attachment means with the threaded sealing fit of the tapered thread of the most threaded male connection and female adapter, this tapered thread attachment means is used for transmitting drilling rod moment of torsion, and has tight sealing property.
Background technology
Oil drill rocker is the capital equipment of oil and gas exploration and exploitation.Oil/gas Well operation is to transmit the moment of torsion between aboveground and down-hole by drilling rod, and gives conveying drilling fluid and mud in well；Oil drill rocker is when drilling well, be primarily subjected to torsion, tension and compression, bend, the combined load such as vibration, and drilling rod inside in course of normal operation is filled with drilling fluid, the Main Function of drilling fluid is that landwaste is carried to ground from shaft bottom, and these liquid are respectively provided with certain corrosivity.Drilling rod is under constantly the washing away of alternate stress and drilling fluid, and drilling rod inwall easily forms pit, and produces fatigue crack, until piercing through and rupturing.Once there is failure fracture in drilling rod, not only makes drilling rod scrap, and find and change inefficacy drilling rod and to take a significant amount of time, and has a strong impact on normal drilling operability, and causes heavy economic losses to oil gas field production.
Tool joint is made up of male connection and the female adapter that mutually screw-threaded engagement connects, and tool joint single drill pipe section will join end to end into the oil drill rocker up to hundreds of meters, thousands of rice, even myriametre one by one.During drilling rod work, not only to bear huge moment of torsion and alternate stress, but also to tolerate drilling liquid pressure in huge bar.Tool joint suddenlys change due to geometry, and structure is complicated, and is easiest to form gap, cooperation face and pit, is that seal failure forms the part leaked, and it is the most also the weakest part that the most whole drilling rod stress is concentrated.Therefore, tool joint working condition in drilling rod is the most severe, and its fatigue fracture and leakage are the main causes that drilling rod lost efficacy, and this is also to cause people to pay close attention to tool joint and closely study main cause.
At present, single shoulder drilling rod that petroleum gas drilling industry is commonly used both at home and abroad, such as the single shoulder drilling rod manufactured by American Petroleum Institute's API standard, such tool joint includes male connection and the female adapter that can mutually be threaded engagement connection.Male connection is to be provided with circular bead surface outside radially arranged right angle on its body, is followed successively by taper pipe thread base portion, Taper Pipe external screw thread and taper pipe thread leading section towards its end from outer shoulder on this joint body；The female adapter body being threadably engaged therewith includes face, female adapter main side, is followed successively by female thread datum hole portion, Taper Pipe female thread and female thread stomidium the most from outside to inside from face, female adapter main side on this joint body.For intermeshing Taper Pipe external screw thread and taper hole female thread, there is identical thread pitch, and form of thread and thread taper accordingly.When joint connects use, face, the main side mutual interference laminating of the outer circular bead surface of male connection and female adapter, undertake and transmit drilling rod moment of torsion and seal, this bit adapter with single circular bead surface, its outstanding feature is that only one of which coordinates circular bead surface, this circular bead surface not only with threaded portion shared drilling rod moment of torsion, and seal.Have an advantage in that simple in construction, handling use the most more convenient, be highly suitable for the use requirement of degree of depth Oil/gas Well the most shallow, middle.But the threaded portion that research shows such separate unit shoulder nipple will undertake most moment of torsion, stress and moment of torsion are concentrated mainly on rear 3 ridges of threaded portion, the stress that this 3 pitch thread undertakes reaches as high as more than the 50% of total stress, and along coordinating shoulder to be gradually lowered to nose threads, stress is undertaken hardly to nose threads tooth, therefore the stress on ridge is the most uneven, directly affects fatigue resistance and the service life of joint, makes joint mechanical strength not make full use of.During for deep-well or Holes of Complicated Wells use, owing to moment of torsion is excessive and excessively concentrates, as easy as rolling off a log the fracture of externally threaded screw thread or female thread is caused the failure accidents such as to swell, and the contact stress that the sealing of circular bead surface only relies between single circular bead surface completes sealing, in the case of bend tension cuts lotus, at shoulder, contact stress drastically declines, when stress is reduced to certain level, will leak, this will have a strong impact on the safety of drillng operation.
In order to improve the torque resistant ability of tool joint, dual stage shoulder nipple is developed in design in the industry, the double shoulder tool joint (patent No. 98806866.4) of high moment of torsion as disclosed in Chinese patent, and the series dual stage shoulder connector product such as XT, HT of Grant company of the U.S..Double shoulder drilling rod are to add again a contact shoulder face on the basis of single circular bead surface nipple, and it is that the female thread stomidium that separate unit is takeed on nipple makes circular bead surface in radially arranged perpendicular type into；The taper pipe thread leading section of male connection makes the male connection front end face can fitted with interior circular bead surface into, when internal and external screw thread joint engages, the outer circular bead surface of male connection and the face, main side of female adapter form a main joint shoulder, and the front end face of male connection constitutes a pair with the interior circular bead surface of female adapter and engages shoulder.During work, major and minor joint shoulder and threaded portion have shared drilling rod moment of torsion, and the mono-circular bead surface of drilling rod moment of torsion no longer Dan Youzhu and threaded portion undertake, and secondary circular bead surface also takes on drilling rod moment of torsion；The especially addition of slave station shoulder, after making stress that threaded portion born and moment of torsion no longer focus primarily upon on 3 pitch threads, owing to secondary circular bead surface also provides stress effect to screw thread back segment, so that moment of torsion and stress threadingly length direction is more evenly distributed, threaded portion shares moment of torsion and stress suffered by major-minor shoulder the most more simultaneously, make the moment of torsion at shoulder and stress reduce, improve the overall stressing conditions of joint.Due also to when the outer circular bead surface of male connection and the distance in its flighting front end face are not equal to the distance between face, female adapter main side and its face, endoporus bottom, during drilling rod work, thread segment on internal and external screw thread joint will produce an axial prestrain stress, this prestrain stress can excavate the potential strength of joint, and the stressing conditions of further uniform screw thread section to a certain extent.
Although above-mentioned double shoulder drilling rod, improve the force-bearing situation of nipple, be conducive to the application in deep-well, but its sealing property still depends on the contact stress on the shoulder plane of vertical central lines, its sealing property is affected very big by drilling rod load situation particularly axially load situation, and in heavy duty service, the fluid pressure in drilling rod is huge, the sealing property of its tool joint is the most unreliable, is difficult to avoid the leakage of drilling rod liquid.For this, occur in that the most again a series of patented technology being intended to improve dual stage shoulder nipple sealing property, such as Chinese patent " metal spherical sealing double-shoulder oil drill rod connector " (patent No.: 201020178278.5), it is to add ring-type ball face sealing face at male connection end, conical surface seal is added at female adapter endoporus, realize sealing with contacting with each other of conical surface seal with ball face sealing face, but in the contact stress of this sealing surface still relies on, the mutual alignment of coupling and load situation, especially sealing surface becomes " the linear contact lay face " of the conical surface and ring-type sphere, sealing contact surface is little, sealing effectiveness is still extremely limited.Chinese patent " curved surface double shoulder tool joint " (patent No.: 201220608835.1), it is then to be changed the major and minor shoulder contact surface of dual stage shoulder grafting head into curved surface by plane, thus increase contact area, though having some improvement sealing property, but its sealing property still depends on axial load and axially contact stress.Other seal en-hancement structure also has increases notch cone structure using different tapering etc..These seal structures, and all to there is contact surface little, is affected greatly by drilling rod load situation, seals the contact resilient deformation of cooperation face and the little deficiency that waits of contact stress, thus it cannot be guaranteed that in reliable sealing property, especially deep-well or ultradeep well operation sealing property more undesirable.
Summary of the invention
For the deficiency existing for above-mentioned prior art, it is the most reasonable that the technical problem to be solved is to provide one threadingly length direction stress distribution, can be effectively improved the torque resistant ability of screw on tool joint, and be in sealing contact that area is big, be in sealing contact the antitorque hermetically sealed drill rod threaded nipple of the stable height of elastic deformation.
The antitorque hermetically sealed drill rod threaded nipple of height of the present invention, including male connection with carry out threaded female adapter therewith；Being provided with outer circular bead surface and external screw thread front end face in this male connection, circular bead surface is disposed with taper pipe thread base portion, Taper Pipe external screw thread and external screw thread leading section between external screw thread front end face vertically outside；It is provided with face, female adapter main side and interior circular bead surface in described female adapter, between this face, female adapter main side and interior circular bead surface, is disposed with female thread stomidium portion, taper hole female thread and female thread datum hole portion vertically；Face, female adapter main side in described female adapter is the anchor ring with inclination angle, and described female thread stomidium portion is conical bore；Outer circular bead surface in described male connection is the anchor ring with inclination angle, the taper pipe thread base portion of male connection is elliptical arc surface, the a length of b of oval cross section major semiaxis of this elliptical arc surface, the oval cross section minor axis length of elliptical arc surface is 2a, and the ratio 2a/b of this minor axis length 2a and major semiaxis length b is equal to the conical bore tapering in female thread stomidium portion；Taper Pipe external screw thread in described male connection includes spaced back segment external screw thread and leading portion external screw thread, and the externally threaded pitch of back segment is T1, and the externally threaded pitch of leading portion is T2；The taper hole female thread of described female adapter includes back segment female thread and leading portion female thread, and the pitch of back segment female thread is T1, and the pitch of leading portion female thread is T2；Back segment external screw thread is corresponding with the position of back segment female thread, and leading portion external screw thread is corresponding with the position of leading portion female thread；Described pitch T2 is more than or equal to pitch T1.
The antitorque hermetically sealed drill rod threaded nipple of height that the present invention provides, within it, when male connection is mutually tightened, first the main shoulder that outer circular bead surface and face, female adapter main side are formed contacts with each other, produce elastic deformation, then the slave station shoulder that external screw thread leading section and interior circular bead surface are formed contacts with each other again, this structure is shared shouldering torgue jointly by two shoulders, the more important thing is that two circular bead surfaces change the overall force-bearing situation of joint, promote that moment of torsion and stress threadingly length direction are uniformly distributed, thus substantially increase torque resistant and the bearing capacity of integral joint；The length difference of double circular bead surfaces and the priority that formed combines, also engagement thread segment and adjacent area thereof in male connection and female adapter creates axial prestrain stress, the Anti-pull-press of tool joint bulk material, counter-bending and anti-torsional strength is made to be fully used, and give full play to the elastic strength potentiality of joint body material, significantly enhance torque resistant and the bearing capacity of tool joint.Due also to after employing present configuration, taper pipe thread base portion on male connection body is elliptical arc surface, and its cross section ellipse short shaft length is equal to the tapering of female thread stomidium portion with matching taper hole with the ratio of major semiaxis length, in the rundown process of internal and external screw thread joint, oval projection cambered surface forms, with the taper hole face of conical bore, the sealing area A that the longest and the narrowest and with taper hole tapering adapts, this sealing area is in sealing contact that area is big, it is stable to be in sealing contact elastic deformation, and this sealing area formed by interference elastic deformation has powerful and stable sealing contact stress.And the contact stress of this sealing area A is only dependent upon the radial force of internal and external screw thread joint interphase interaction, it is not rely on axial tightening power and the load situation of drilling rod, defines tight, reliable and stable all-sealed structure.Due also to the outer circular bead surface on male connection body and the face, female adapter main side on female adapter body are the anchor ring with inclination angle, the mutual contact with inclined plane in this upper shoulder face and face, main side is fitted, provide for elliptic arc sealing surface again and strong radially contact with stress, both ensure that the reliable of sealing effectiveness, in turn ensure that joint design security and stability.More due in technical solution of the present invention, Taper Pipe external screw thread and connected taper hole female thread all use two sections of helicitic textures, and the leading portion thread pitch T2 near small end side is more than the big back segment thread pitch T1 holding side, so when interior, after a fixing turn is tightened in male connection, the screw thread that leading portion combines produces different elastic deformation amounts compared with back segment screw thread, leading portion elastic deformation amount is more than the elastic deformation amount of back segment, the stress forcing back segment screw thread shifts to leading portion screw thread, thus efficiently solve joint connections threads serious uneven problem along its length, the big portion of traditional jointing structure screw thread stress is avoided to concentrate on the phenomenon of root 3 tooth, the stress on each ridge and stress is made to become uniform, drastically increase torque resistant and the stress bearing capacity of joint.This structure can also further enhance the axial prestrain stress of joint simultaneously, makes the elastic strength of joint material be strengthened again, and joint bearing capacity can improve more than 2 times；Pre-load arrangement, in addition to strengthening its bearing capacity, is also effectively improved the stress of screw thread, the internal force peak value reducing and stabilizing in each tooth of screw thread, it is to avoid stress collection neutralizes the extraordinary failure of joint.
A kind of preferred implementation of the present invention, a major cross-sectional axis summit last ridge externally threaded with Taper Pipe of described elliptical arc surface is adjacent, and a cross-section minor axis summit of this elliptical arc surface is positioned on outer circular bead surface.This structure preferably achieves the smooth and cooperation smoothly of threaded portion and the transition in screw thread datum hole portion, beneficially sealing surface, reduces twist-on and combines resistance, and rational in infrastructure, it is simple to fabrication and processing.
Preferably, the conical bore tapering in described female thread stomidium portion is equal to the tapering of taper hole female thread.This structure is easy to processing, is easy to assembly connection, is also beneficial to the smooth of sealing surface and coordinates smoothly.
Preferably, the described conical bore tapering in female thread stomidium portion and the tapering of taper hole female thread are 1:6 or 1:16.This thread taper is advantageously implemented standardization making and mass production, is also beneficial to accessory exchange in actual use.
Preferably, inclination alpha=10 ° of described outer circular bead surface～20 °；Angle of inclination beta=10 ° in face, described female adapter main side～20 °.This outer circular bead surface inclination angle and inclination angle, face, female adapter main side size can increase the sealing effectiveness between joint, more can provide reliable and stable to arc sealing surface and radially contact with power, so that it is guaranteed that tight sealing effectiveness.
Preferably, the inclination alpha of described outer circular bead surface is more than or equal to the angle of inclination beta in face, female adapter main side.This sealing structure fiting effect is more stable, and sealing property is more excellent.
Another preferred implementation of the present invention, described leading portion external screw thread and pitch T of leading portion female thread2, back segment external screw thread and pitch T of back segment female thread1, T2=(1.00～1.10) and T1.This pitch difference both ensure that between internal and external screw thread rational elastic deformation amount in the engagement condition, thus the effectively stress on uniform screw thread tooth and stress；This pitch difference also ensure that and reasonably preloads, to reach enough elastic strength.
Preferably, described leading portion external screw thread and pitch T2 of leading portion female thread, back segment external screw thread and pitch T of back segment female thread1, T2=(1.01～1.05) T1.This structure can realize more reasonably elastic deformation amount and axial preload.
Further, the reach of described leading portion external screw thread and leading portion leading portion screw thread is L2, the reach of back segment external screw thread and back segment female thread is L1, L2=(1.00～1.10) L1.This structure can preferably adapt to the change needs of pitch difference of the present invention.
Preferably, described back segment external screw thread and the externally threaded tapering of leading portion are equal, between back segment external screw thread and leading portion external screw thread between be separated with external screw thread transition part；The tapering of described back segment female thread and leading portion screw thread is equal, between back segment female thread and leading portion female thread between be separated with female thread transition part.This structure is easy to processing and fabricating and is linked and packed, and advantageously reduces twist-on and combines resistance.
Accompanying drawing explanation
With detailed description of the invention, the present invention is elaborated below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of male connection in traditional double shoulder drilling rod；
Fig. 2 is the structural representation of female adapter in traditional double shoulder drilling rod；
Fig. 3 is male connection and the partial schematic diagram of female adapter attachment structure of a kind of detailed description of the invention of the present invention；
Fig. 4 is the partial enlarged drawing in structure shown in Fig. 3 at I；
Fig. 5 is the partial enlarged drawing in structure shown in Fig. 3 at II；
Fig. 6 is the threaded connection relation analysis chart of internal and external screw thread joint in structure shown in Fig. 3.
In figure, 1 male connection, 2 male connection bodies, 3 male connection tube chambers, 4 outer circular bead surfaces, 5 taper pipe thread base portions, 6 Taper Pipe external screw threads, 61 back segment external screw threads, 62 external screw thread transition parts, 63 leading portion external screw threads, 7 external screw thread leading sections, 8 external screw thread front end faces, 9 face, female adapter main sides, 10 female thread stomidium portions, 11 taper hole female threads, 111 back segment female threads, 112 female thread transition parts, 113 leading portion female threads, 12 female thread datum hole portions, circular bead surface in 13, 14 female adapters, 15 female adapter bodies, 16 female adapter tube chambers.
Detailed description of the invention
Double shoulder drilling rod are all made up of male connection 1 and the female adapter 14 that mutually screw-threaded engagement connects.One end of its male connection 1 is fixing with a drilling rod one end to be connected, the other end of male connection 1 is then connected with female adapter 14 by connection screw thread, the other end of female adapter 14 is then fixing with another root drilling rod to be connected, and connects with the spreading that this completes each joint drilling rod.
As shown in Figure 1, traditional double shoulder drilling rod male connection 1 include the male connection body 2 be made up of forging, this male connection body 2 is substantially in short circular tube structure, and its shaft core position is provided with male connection tube chamber 3, is connected with drilling rod pore with this.One end of male connection body 2 is fixing with drilling rod is connected end, and the other end is then threaded ends.Threaded end portion on male connection body 2 is provided with outer circular bead surface 4 and external screw thread front end face 8；Outer circular bead surface 4 is the anchor ring being perpendicular to body axis, and external screw thread front end face 8 is then positioned at the nose of body and also perpendicular with body axis.Taper pipe thread base portion 5, Taper Pipe external screw thread 6 and external screw thread leading section 7 is set gradually vertically outside on the male connection body 2 of circular bead surface 4 to external screw thread front end face 8.Taper pipe thread base portion 5 is a face of cylinder, and this one end, face of cylinder is connected with outer circular bead surface 4, and the other end is connected with big end last screw thread of root of Taper Pipe external screw thread 6.External screw thread leading section 7 is also a face of cylinder, and it is between the Taper Pipe external screw thread 6 the most previous ridge of small end and external screw thread front end face 8.The centrage of the centrage of taper pipe thread base portion 5, the centrage of Taper Pipe external screw thread 6 place round platform and external screw thread leading section 7 all with the axial line conllinear of male connection body 2.Taper Pipe external screw thread 6 both can be metric system taper pipe thread, it is possible to for taper pipe thread made in Great Britain, or the conventional taper pipe thread structure such as taper pipe thread made in U.S.A.
As in figure 2 it is shown, traditional female adapter 14 also includes the female adapter body 15 being made up of forging, female adapter body 15 is the most substantially in short circular tube structure, and its shaft core position is provided with female adapter tube chamber 16.One end of female adapter body 15 is fixing with drilling rod to be connected, and the other end is threaded ends.This threaded end portion is provided with face, female adapter main side 9, this face, female adapter main side 9 is the anchor ring being perpendicular to body central line, this end of female adapter body 15 is for being provided with bore hole, boring mouth position is face, female adapter main side 9, being interior circular bead surface 13 at the bottom of the hole of bore hole, this interior circular bead surface 13 is also the anchor ring vertical with body axis.The female adapter body 15 in face, female adapter main side 9 to interior circular bead surface 13 is disposed with female thread stomidium portion 10, taper hole female thread and female thread datum hole portion 12 vertically.Female thread stomidium portion 10 is one section of cylindrical hole, and this cylindrical hole one end is connected with face, female adapter main side 9, and the other end is connected with last ridge of the big end of taper hole female thread 11.Female thread datum hole portion 12 is also a cylindrical hole vertical with body axis, and it is between the taper hole female thread 11 the most previous ridge of small end and interior circular bead surface 13.Female thread stomidium portion 10, taper hole female thread 11 place round platform, and the centrage in female thread datum hole portion 12 all with the centerline collineation of female adapter body 15.The same taper hole female thread 11 being meshed with Taper Pipe external screw thread 6 is metric system, taper pipe thread made in Great Britain or made in U.S.A.
In figure 3, Taper Pipe external screw thread 6 in male connection 1 uses segmentation structure, this Taper Pipe external screw thread 6 is separated into back segment external screw thread 61 and leading portion external screw thread 63, external screw thread transition part 62 it is separated with between back segment external screw thread 61 and leading portion external screw thread 63, the outside diameter of external screw thread transition part 62 holds greatly the root diameter (RD) of screw thread less than the root diameter (RD) of back segment external screw thread 61 small end screw thread, the end diameter of external screw thread transition part 62 less than leading portion external screw thread 63.Correspondingly, the taper hole female thread 11 of female adapter 14 is also adopted by segmentation structure, this taper hole female thread 11 is separated into back segment female thread 111 and leading portion female thread 113, female thread transition part 112 it is separated with between back segment female thread 111 and leading portion female thread 113, female thread transition part 112 is short conical bore, this female thread transition part 112 outside diameter holds greatly the root diameter (RD) of screw thread more than the root diameter (RD) of back segment female thread 111 small end screw thread, female thread transition part 112 end diameter more than leading portion female thread 113.
As shown in Figure 3, Figure 4, shaft core position in male connection 1 is provided with male connection tube chamber 3, the male connection body 2 of male connection 1 is provided with outer circular bead surface 4 and external screw thread front end face 8, male connection body 2 is followed successively by taper pipe thread base portion 5, back segment external screw thread 61, external screw thread transition part 62, leading portion external screw thread 63 and external screw thread leading section 7 vertically.External screw thread leading section 7 is a face of cylinder, and external screw thread front end face 8 is the face of cylinder being perpendicular to body axial line, and it is positioned at the nose of external screw thread leading section 7；Taper Pipe external screw thread 6 uses taper pipe thread structure, and its tapering is 16 or 1 16, and this thread taper is advantageously implemented standardization making and mass production, is also beneficial to accessory exchange in actual use.Outer circular bead surface 4 is the face of cylinder with forward leaning angle, this outer circular bead surface 4 and the diametric inclination alpha of male connection body 2 should select between 10 ° 20 °, prioritizing selection α=15 °, this outer circular bead surface inclination angle and inclination angle, face, female adapter main side can increase the sealing effectiveness between joint, more can provide reliable and stable to arc sealing surface and radially contact with power, so that it is guaranteed that tight sealing effectiveness.Taper pipe thread base portion 5 uses elliptical arc surface for non-cylindrical, on the cross section by male connection body 2 axis, the cross section a length of b of ellipse major semiaxis of this elliptical arc surface, the cross-section minor axis length of elliptical arc surface is 2a, a major axis summit oval on this cross section is positioned on the cross section at last ridge tail end place of Taper Pipe external screw thread 6, this cross section is by last ridge tail end described and the axial line that is perpendicular to male connection body 2, and this major axis summit can also be within last ridge of Taper Pipe external screw thread 6 does not surpass the adjacent area of a pitch certainly.One minor axis vertex of the cross section ellipse of this elliptical arc surface is then positioned at the root of the outer circular bead surface 4 of inclination.So elliptical arc surface is actual on cross section is 1/4th ellipses.The a length of 2a of cross section ellipse short shaft, the cross section a length of b of ellipse major semiaxis, this minor axis length 2a and major semiaxis length b than 2a b equal to the conical bore tapering in female thread stomidium portion 10.
As shown in Fig. 3, Fig. 5, female adapter body 15 shaft core position of female adapter 14 is provided with female adapter tube chamber 16.Female adapter body 15 is additionally provided with face, female adapter main side 9 and interior circular bead surface 13, between this face, female adapter main side 9 and interior circular bead surface 13, is disposed with female thread stomidium portion 10, back segment female thread 111, female thread transition part 112, leading portion female thread 113 and female thread datum hole portion 12 vertically.Face, female adapter main side 9 is the face of cylinder with inclination angle, between these face, female adapter main side 9 and diametric angle of inclination beta=10 ° ~ 20 ° of female adapter body 15, and prioritizing selection β=15 °.Female thread stomidium portion 10 is conical bore, and this conical bore tapering is associated with the cross section oval structure parameter of the taper pipe thread base portion 5 of male connection 1, and i.e. oval 2a b is equal to this conical bore tapering.Preferably the conical bore tapering in female thread stomidium portion 10 is equal to the tapering of taper hole female thread 11, and both can also use different taperings certainly.In order to strengthen the splicing results of internal and external screw thread joint, the inclination alpha angle of inclination beta more than face, female adapter main side 9 between outer land shoulder face 4 can be made, as used α=16 °, β=15 ° etc..
When male connection 1 is mutually tightened with female adapter 14, the Taper Pipe external screw thread 6 including back segment external screw thread 61 and leading portion external screw thread 63 and the taper hole female thread 11 including back segment female thread 111 and leading portion female thread 113 mutually spin, first outer circular bead surface 4 and face, female adapter main side 9 are contacted with each other, owing to outer circular bead surface 4 has towards identical inclination angle with face, female adapter main side 9, so that the nose portion card of female adapter 14 injects between outer circular bead surface 4 and taper pipe thread base portion 5, this structure can strengthen the radial force between female thread stomidium portion 10 and taper pipe thread base portion 5.Under the continuation effect connecting screw thread, the junction surface of internal and external screw thread joint produces elastic deformation, and then external screw thread front end face 8 and interior circular bead surface 13 contact with each other again, thus produce axle and preload.In the process, the conical bore face in female thread stomidium portion 10 gradually elliptical arc surface with taper pipe thread base portion 5 contacts and produces elastic deformation area A.As shown in Figure 4, the elastic deformation sealing area A formed, owing to oval 2a b is equal to the tapering of female thread stomidium portion 10 conical bore, in rundown process, internal and external screw thread joint can form the longest and the narrowest sealing area A in wedging structure, the contact stress of the sealing area A of this wedging structure is not affected by axial load mainly along radial distribution, and this version easily forms longer sealing contact surface vertically and the longest and the narrowest elastic packing region, reach sealing effectiveness tight, reliable.
As shown in Figure 6, when internal and external screw thread joint is connected with each other, back segment external screw thread 61 spins with back segment female thread 111 phase, and leading portion external screw thread 63 spins with leading portion female thread 113 phase, intermeshing leading portion external screw thread 63 and pitch T of leading portion female thread 1132More than intermeshing back segment external screw thread 61 and pitch T of back segment female thread 1111, T2/T1Should select between 1.0 1.1, such as prioritizing selection T2=1.05T1, this pitch difference both ensure that between internal and external screw thread rational elastic deformation amount in the engagement condition, thus the effectively stress on uniform screw thread tooth and stress；This pitch difference also ensure that and reasonably preloads, to reach enough elastic strength.Leading portion external screw thread 63 and reach L of leading portion female thread 1132More than or equal to back segment external screw thread 61 and reach L of back segment female thread 1111, L2/L1Should select between 1.0 1.1, preferably L2= L1Or L2=1.05 L1, this structure can preferably adapt to the change needs of pitch difference of the present invention.Using the structure of above-mentioned decreasing worm-pitch, when internal and external screw thread joint mutually screws in a fixing turn (or angle), forward and backward two thread segments can produce different displacements, and leading portion screw thread is slightly faster than back segment screw thread.So on the one hand, can the torque of back segment screw thread and stress be shifted to leading portion screw thread, when changing threaded, torque stress concentrates on the force-bearing situation of a few ridge in screw thread rear portion, and the stress connecting screw thread is more reasonable, makes the bearing capacity of whole screw thread greatly improve.The most this structure enhances again the axial prestrain stress of joint, and not only joint bearing capacity strengthens, and the internal force peak value being effectively reduced on ridge.
Above-mentioned only enumerated the present invention some preferred embodiment; obviously the invention is not limited in this; those skilled in the art is in the case of its general principles, it is also possible to make a lot of improvement and deformation, and these improve and deformation is regarded as falling within the scope of protection of the present invention.
Claims (8)
1. a high antitorque hermetically sealed drill rod threaded nipple, including male connection (1) with carry out threaded female adapter (14) therewith；Being provided with outer circular bead surface (4) and external screw thread front end face (8) in this male connection (1), circular bead surface (4) is to being disposed with taper pipe thread base portion (5), Taper Pipe external screw thread (6) and external screw thread leading section (7) between external screw thread front end face (8) vertically outside；It is provided with face, female adapter main side (9) and interior circular bead surface (13) in described female adapter (14), between this face, female adapter main side (9) and interior circular bead surface (13), is disposed with female thread stomidium portion (10), taper hole female thread (11) and female thread datum hole portion (12) vertically；It is characterized in that: the face, female adapter main side (9) in described female adapter (14) is the anchor ring with inclination angle, and described female thread stomidium portion (10) is conical bore；Outer circular bead surface (4) in described male connection (1) is the anchor ring with inclination angle, the taper pipe thread base portion (5) of male connection (1) is elliptical arc surface, the a length of b of oval cross section major semiaxis of this elliptical arc surface, the oval cross section minor axis length of elliptical arc surface is 2a, and the ratio 2a/b of this minor axis length 2a and major semiaxis length b is equal to the conical bore tapering in female thread stomidium portion (10)；Taper Pipe external screw thread (6) in described male connection (1) includes spaced back segment external screw thread (61) and leading portion external screw thread (63), and the pitch of back segment external screw thread (61) is T1, the pitch of leading portion external screw thread (63) is T2；Taper hole female thread (11) in described female adapter (14) includes back segment female thread (111) and leading portion female thread (113), and the pitch of back segment female thread (111) is T1, the pitch of leading portion female thread (113) is T2；Back segment external screw thread (61) is corresponding with the position of back segment female thread (111), and leading portion external screw thread (63) is corresponding with the position of leading portion female thread (113)；Described pitch T2More than or equal to pitch T1；One major cross-sectional axis summit of described elliptical arc surface is adjacent with last ridge of Taper Pipe external screw thread (6), and a cross-section minor axis summit of this elliptical arc surface is positioned on outer circular bead surface (4)；Inclination alpha=10 ° of described outer circular bead surface (4)～20 °；Angle of inclination beta=10 ° of face, described female adapter main side (9)～20 °.
The antitorque hermetically sealed drill rod threaded nipple of height the most according to claim 1, it is characterised in that: the conical bore tapering of described female thread stomidium portion (10) is equal to the tapering of taper hole female thread (11).
The antitorque hermetically sealed drill rod threaded nipple of height the most according to claim 2, it is characterised in that: the conical bore tapering of described female thread stomidium portion (10) is 1:6 or 1:16.
The antitorque hermetically sealed drill rod threaded nipple of height the most according to claim 1, it is characterised in that: the inclination alpha of described outer circular bead surface (4) is more than or equal to the angle of inclination beta in face, female adapter main side (9).
The antitorque hermetically sealed drill rod threaded nipple of height the most according to claim 1, it is characterized in that: described leading portion external screw thread (63) and pitch T2 of leading portion female thread (113), back segment external screw thread (61) and pitch T1 of back segment female thread (111), T2=(1.00～1.10) T1.
The antitorque hermetically sealed drill rod threaded nipple of height the most according to claim 5, it is characterized in that: described leading portion external screw thread (63) and pitch T2 of leading portion female thread (113), back segment external screw thread (61) and pitch T1 of back segment female thread (111), T2=(1.01～1.05) T1.
7. according to the antitorque hermetically sealed drill rod threaded nipple of the height described in claim 5 or 6, it is characterized in that: the reach of described leading portion external screw thread (63) and leading portion female thread (113) is L2, the reach of back segment external screw thread (61) and back segment female thread (111) is L1, L2=(1.00～1.10) L1.
The antitorque hermetically sealed drill rod threaded nipple of height the most according to claim 1, it is characterized in that: the tapering of described back segment external screw thread (61) and leading portion external screw thread (63) is equal, between back segment external screw thread (61) and leading portion external screw thread (63) between be separated with external screw thread transition part (62)；The tapering of described back segment female thread (111) and leading portion female thread (113) is equal, between back segment female thread (111) and leading portion female thread (113) between be separated with female thread transition part (112).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410349698.8A CN104131788B (en) | 2014-07-22 | 2014-07-22 | High antitorque hermetically sealed drill rod threaded nipple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410349698.8A CN104131788B (en) | 2014-07-22 | 2014-07-22 | High antitorque hermetically sealed drill rod threaded nipple |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104131788A CN104131788A (en) | 2014-11-05 |
| CN104131788B true CN104131788B (en) | 2016-08-24 |
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| CN201410349698.8A Active CN104131788B (en) | 2014-07-22 | 2014-07-22 | High antitorque hermetically sealed drill rod threaded nipple |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481422B (en) * | 2014-11-12 | 2016-10-26 | 中国石油天然气集团公司 | A kind of aluminium alloy drill pipe body and the attachment structure of steel joint |
| CN104727757A (en) * | 2015-02-26 | 2015-06-24 | 山东祺龙海洋石油钢管股份有限公司 | Double-step special threaded casing pipe connecting device |
| JP6037091B1 (en) | 2015-03-30 | 2016-11-30 | Ｊｆｅスチール株式会社 | Pipe threaded joint |
| CN114412377A (en) * | 2022-01-25 | 2022-04-29 | 陕西太合智能钻探有限公司 | Mine drill pipe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4629222A (en) * | 1983-08-31 | 1986-12-16 | Hunting Oilfield Services (Uk) Limited | Pipe connector |
| CN1155639A (en) * | 1995-10-03 | 1997-07-30 | 瓦卢雷石油和气体公司 | Threaded joint for tubes |
| CN2732980Y (en) * | 2004-08-18 | 2005-10-12 | 天津钢管有限责任公司 | Sawtooth casing threaded connection structure |
| WO2009000428A1 (en) * | 2007-06-25 | 2008-12-31 | Vallourec Mannesmann Oil & Gas France | Threaded element of a component with opposed threading portions and corresponding tubular threaded connection |
-
2014
- 2014-07-22 CN CN201410349698.8A patent/CN104131788B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4629222A (en) * | 1983-08-31 | 1986-12-16 | Hunting Oilfield Services (Uk) Limited | Pipe connector |
| CN1155639A (en) * | 1995-10-03 | 1997-07-30 | 瓦卢雷石油和气体公司 | Threaded joint for tubes |
| CN2732980Y (en) * | 2004-08-18 | 2005-10-12 | 天津钢管有限责任公司 | Sawtooth casing threaded connection structure |
| WO2009000428A1 (en) * | 2007-06-25 | 2008-12-31 | Vallourec Mannesmann Oil & Gas France | Threaded element of a component with opposed threading portions and corresponding tubular threaded connection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104131788A (en) | 2014-11-05 |
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