CN104074473B - Drill rod connecting device for drilling of ultra-deep oil gas well - Google Patents
Drill rod connecting device for drilling of ultra-deep oil gas well Download PDFInfo
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- CN104074473B CN104074473B CN201410349696.9A CN201410349696A CN104074473B CN 104074473 B CN104074473 B CN 104074473B CN 201410349696 A CN201410349696 A CN 201410349696A CN 104074473 B CN104074473 B CN 104074473B
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Abstract
The invention discloses a drill rod connecting device for drilling of an ultra-deep oil gas well. The drill rod connecting device comprises an external threaded connector and an internal threaded connector in threaded connection with the external threaded connector, wherein an internal threaded connector main end surface on the internal threaded connector is an annular surface with an inclination; an internal threaded end hole part is a conical hole; an external shoulder surface on the external threaded connector is an annular surface with an inclination; a taper pipe threaded basal part of the external threaded connector is an elliptical arc surface; the length of a semi-major axis of an elliptical cross section of the elliptical arc surface is b; the length of a minor axis of the elliptical cross section of the elliptical arc surface is 2a; and a ratio 2a/b of the length 2a of the minor axis to the length b of the semi-major axis is equal to a taper of the conical hole of the internal threaded end hole part. The drill rod connecting device for the drilling of the ultra-deep oil gas well can effectively improve anti-torque ability of a connector of a threaded drill rod, furthermore, sealing surfaces are matched reliably, the sealing contact area is large, elastic deformation of sealing contact is stable, and sealing is tight. The device is very applicable to exploration and exploitation of a deep oil gas well, the ultra-deep well and a complicated well.
Description
Technical field
The present invention relates to a kind of screw connection of the oil drill rocker for oil and gas exploration and exploitation, particularly relate to the linkage of the threaded sealing fit of the tapered thread with male connection and the female adapter be mutually threaded, this tapered thread linkage for transmitting drilling rod moment of torsion, and has tight sealing performance.
Background technology
Oil drill rocker is the capital equipment of oil and gas exploration and exploitation.Oil/gas Well operation is by drilling rod to transmit the moment of torsion between aboveground and down-hole, and gives conveying drilling fluid and mud in well; Oil drill rocker is when drilling well, mainly bear the combined loads such as torsion, tension and compression, bending, 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 into ground from shaft bottom, and these liquid all have certain corrosivity.Drilling rod is under constantly the washing away of alternating stresses and drilling fluid, and drilling rod inwall easily forms pit, and produces fatigue crack, until pierce through and rupture.Drilling rod, once there is failure fracture, not only makes drilling rod scrap, and finds and change inefficacy drilling rod and will spend the plenty of time, has a strong impact on normal drilling operability, and produces to oil gas field and cause heavy economic losses.
The male connection that tool joint is connected by mutual screw-threaded engagement and female adapter form, and drill pipe section independent one by one joins end to end into and reaches hundreds of rice, thousands of rice, the even oil drill rocker of myriametre by tool joint.During drilling rod work, not only to bear huge moment of torsion and alternating stresses, but also drilling liquid pressure in huge bar will be tolerated.Tool joint suddenlys change due to geometry, complex structure, and the most easily forms fitting face gap and pit, is that seal failure forms the part of leaking, and whole drilling rod stress is concentrated especially is the most also the weakest part.Therefore, tool joint condition of work 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 cause people's paying close attention to and closely studying main cause tool joint.
At present, single shoulder drilling rod that domestic and international petroleum gas drilling industry generally adopts, as the single shoulder drilling rod manufactured by American Petroleum Institute (API) API standard production, such tool joint includes male connection and the female adapter of the mutual screw-threaded engagement connection of energy.Male connection is on its body, be provided with circular bead surface outside the right angle radially arranged, and this joint body is followed successively by taper pipe thread base portion, Taper Pipe external screw thread and taper pipe thread leading section from outer shoulder towards its end; Comprise face, female adapter main side with the female adapter body of its screw-threaded engagement, this joint body is followed successively by internal thread datum hole portion, Taper Pipe internal thread and internal thread stomidium vertically from outside to inside from face, female adapter main side.For intermeshing Taper Pipe external screw thread and taper hole internal thread, there is identical thread pitch, and corresponding form of thread and thread taper.When joint connects use, the outer circular bead surface of male connection and the mutual interference in face, main side of female adapter are fitted, bear and transmit drilling rod moment of torsion and seal, this bit adapter with single circular bead surface, its most outstanding feature only has to coordinate a circular bead surface, this circular bead surface not only with threaded portion shared drilling rod moment of torsion, and to seal.Its advantage is that structure is simple, and handling use all more convenient, are highly suitable for the instructions for use of generally shallow, middle degree of depth Oil/gas Well.But research shows that the threaded portion of such separate unit shoulder nipple will bear most moment of torsion, stress and moment of torsion mainly concentrate on rear 3 ridges of threaded portion, the stress that this 3 pitch thread is born reaches as high as more than 50% of total stress, and along coordinating shoulder to reduce gradually to nose threads place, stress is born hardly to nose threads tooth, therefore the stress on ridge is extremely uneven, directly affects fatigue resistance and the application life of joint, and joint mechanical strength can not be made full use of.For when using in deep-well or Holes of Complicated Wells, because moment of torsion is excessive and too concentrated, as easy as rolling off a logly externally threaded screw thread is caused to rupture or internal thread such as to swell at the failure accidents, and the sealing of circular bead surface only relies on contact stress between single circular bead surface to complete sealing, under bend tension cuts lotus situation, shoulder place contact stress sharply 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 disclosed in Chinese patent, and connector product such as serial dual stage shoulder such as XT, HT etc. of Grant company of the U.S..Two shoulder drilling rod is on the basis of single circular bead surface nipple, turn increase a contact shoulder face, and it is circular bead surface in internal thread stomidium separate unit the being takeed on nipple perpendicular type that makes into radially to arrange; 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 and the interior circular bead surface of female adapter form a pair and engage shoulder.During work, major and minor joint shoulder and threaded portion have shared drilling rod moment of torsion, and the drilling rod moment of torsion no longer mono-circular bead surface of Dan Youzhu and threaded portion is born, and secondary circular bead surface also bears drilling rod moment of torsion; What especially slave station was takeed on adds, after the stress that threaded portion is born and moment of torsion no longer mainly concentrate on 3 pitch threads, because secondary circular bead surface also double thread back segment provides effect of stress, thus make moment of torsion and stress threadingly length direction be more evenly distributed, threaded portion shares again moment of torsion and stress suffered by major-minor shoulder more simultaneously, the moment of torsion at shoulder place and stress are reduced, improves the overall stressing conditions of joint.Also due 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 the prestrain stress of an axis, this prestrain stress can excavate the potential strength of joint to a certain extent, and the stressing conditions of further uniform screw thread section.
Although above-mentioned two shoulder drilling rod, improve the force-bearing situation of nipple, be conducive to the application in deep-well, but its sealing performance still depends on the contact stress on the shoulder plane of vertical central lines, its sealing performance is very large by the impact of drilling rod load situation especially axial load situation, and in heavy duty service, the fluid pressure in drilling rod is huge, the sealing performance of its tool joint is extremely unreliable, is difficult to the leakage avoiding drilling rod liquid.For this reason, there is again in the industry a series of patented technology being intended to improve dual stage shoulder nipple sealing performance, as Chinese patent " the metal spherical sealing double-shoulder oil drill rod connector " (patent No.: 201020178278.5), it adds ring-type ball face sealing face at male connection end, conical surface seal is added at female adapter endoporus, realize sealing with ball face sealing face and contacting with each other of conical surface seal, but in the contact stress of this sealing surface still depends on, the mutual alignment of socket 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 very limited.Chinese patent " curved surface the double shoulder tool joint " (patent No.: 201220608835.1), then change the major and minor shoulder contact surface of dual stage shoulder grafting head into curved surface by plane, thus increase contact area, though have some improvement to sealing performance, its sealing performance still depends on axial load and axial contact stress.Other seal en-hancement structure also has increase notch to adopt cone structure of different tapering etc.It is little all to there is contact surface in these hermetically-sealed constructions, affect greatly by drilling rod load situation, be sealed and matched the distortion of face contact resilient and the deficiency such as contact stress is little, thus can not ensure reliable sealing performance, and especially in deep-well or ultradeep well operation, sealing performance is more undesirable.
Summary of the invention
For the deficiency existing for above-mentioned prior art, technical problem to be solved by this invention is to provide a kind of torque resistant ability that effectively can not only improve screw on tool joint, and sealing surface coordinates reliable, sealing contact surface is long-pending greatly, the deformation of sealing contact resilient is stablized, and seals the tight drill rod connecting device for ultra-deep oil gas well drilling.
Another technical problem to be solved of the present invention is to provide that a kind of sealing performance is excellent, torque resistant ability is strong, and the threadingly more rational drill rod connecting device for ultra-deep oil gas well drilling of length direction stress distribution.
The another technical problem that will solve of the present invention is to provide that a kind of torque carrying capability is strong, the more rational drill rod connecting device for ultra-deep oil gas well drilling of screw thread stress distribution, make the stress distribution in reach direction more aligned, thus play the supporting capacity of thread segment and circular bead surface to greatest extent.
Drill rod connecting device for ultra-deep oil gas well drilling of the present invention, comprises male connection and carries out with it the female adapter that is threaded; This male connection is provided with outer circular bead surface and external screw thread front end face, is disposed with taper pipe thread base portion, Taper Pipe external screw thread and external screw thread leading section vertically between circular bead surface to external screw thread front end face outside; Described female adapter is provided with face, female adapter main side and interior circular bead surface, between this face, female adapter main side and interior circular bead surface, is disposed with internal thread stomidium portion, taper hole internal thread and internal thread datum hole portion vertically; Face, female adapter main side in described female adapter is the anchor ring with inclination angle, and described internal 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 oval cross section major semiaxis length of this elliptical arc surface is b, the oval cross section minor axis length of elliptical arc surface is 2a, and this minor axis length 2a equals the conical bore tapering in internal thread stomidium portion with the ratio 2a/b of major semiaxis length b.
Drill rod connecting device for ultra-deep oil gas well drilling provided by the invention, within it, when male connection is tightened mutually, 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 shares shouldering torgue jointly by two shoulders, the more important thing is that two circular bead surfaces change the overall force-bearing situation of joint, promotion moment of torsion and stress threadingly length direction are uniformly distributed, thus substantially increase torque resistant and the supporting capacity of integral joint, the length difference of two circular bead surface and the priority that formed combines, also create axial prestrain stress in the thread engagement section of male connection and female adapter and adjacent area thereof, make the Anti-pull-press of tool joint bulk material, counter-bending and anti-torsional strength is fully used, and give full play to the elastic strength potentiality of joint body material, significantly enhance torque resistant and the supporting capacity of tool joint.More due to after employing structure of the present invention, taper pipe thread base portion on male connection body is elliptical arc surface, and its cross section ellipse short shaft length and the ratio of major semiaxis length equal the tapering of internal thread stomidium portion with matching taper hole, in the rundown process of internal and external screw thread joint, the taper hole face of oval projection cambered surface and conical bore forms sealing area A that is long and narrow gently and that adapt with the tapering of taper hole, sealing regional seal contact area is large, the deformation of sealing contact resilient is stablized, and this sealing area formed by interference elastic deformation has powerful and stable sealing contact stress.And the contact stress of sealing region A only depends on the radial load of internal and external screw thread joint interphase interaction, and do not rely on axial tightening power and the load situation of drilling rod, define tight, reliable and stable all-sealed structure.Also because 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, this upper shoulder face and face, main side mutual contacts laminating with inclined plane, again for elliptic arc sealing surface provides strong radial contact stress, both ensure that the reliable of sealing effectiveness, in turn ensure that joint design security and stability.The present invention, by the selection optimization of its major parameter, achieves the ability of the reliable hermetically sealed effect of nipple and higher torque resistant and stress.
A kind of preferred embodiment of the present invention, a major cross-sectional axis summit of described elliptical arc surface is adjacent with Taper Pipe last ridge externally threaded, and a cross-section minor axis summit of this elliptical arc surface is positioned on outer circular bead surface.This structure achieves the transition in threaded portion and screw thread datum hole portion preferably, and be conducive to the level and smooth of sealing surface and coordinate smoothly, minimizing is twisted access node and closed resistance, and rational in infrastructure, is convenient to make processing.
Preferably, the conical bore tapering in described internal thread stomidium portion equals the tapering of taper hole internal thread.This structure is convenient to processing, is convenient to assembly connection.
Preferably, the described conical bore tapering in internal thread stomidium portion and the tapering of taper hole internal thread are 1:6 or 1:16.This thread taper is conducive to realizing standardization making and mass production, is also conducive to accessory exchange in actual use.
Preferably, inclination alpha=10 ° ~ 20 ° of described outer circular bead surface; 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 radial contact force to arc sealing surface, thus guarantee tight sealing effectiveness.
Preferably, the inclination alpha of described outer circular bead surface is greater 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 performance is more excellent.
Another drill rod connecting device for ultra-deep oil gas well drilling of the present invention, comprises male connection and carries out with it the female adapter that is threaded; This male connection is provided with outer circular bead surface and external screw thread front end face, is disposed with taper pipe thread base portion, Taper Pipe external screw thread and external screw thread leading section vertically between circular bead surface to external screw thread front end face outside; Described female adapter is provided with face, female adapter main side and interior circular bead surface, between this face, female adapter main side and interior circular bead surface, is disposed with internal thread stomidium portion, taper hole internal thread and internal thread datum hole portion vertically; Face, female adapter main side in described female adapter is the anchor ring with inclination angle, and described internal 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 oval cross section major semiaxis length of this elliptical arc surface is b, the oval cross section minor axis length of elliptical arc surface is 2a, and this minor axis length 2a equals the conical bore tapering in internal thread stomidium portion with the ratio 2a/b of major semiaxis length b; 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 internal thread of described female adapter comprises back segment internal thread and leading portion internal thread, and the pitch of back segment internal thread is T1, and the pitch of leading portion internal thread is T2; Back segment external screw thread is corresponding with the position of back segment internal thread, and leading portion external screw thread is corresponding with the position of leading portion internal thread; Described pitch T2 is more than or equal to pitch T1.
Technical scheme of the present invention, first owing to have employed both shoulders bench drill knock-off joint structure, not only effectively improve the overall force-bearing situation of joint, moment of torsion and stress is impelled in axial direction to be uniformly distributed, drastically increase anti-twisting property and the supporting capacity of whole joint, and dual stage shoulder structure makes again joint produce prestrain stress vertically, has given full play to the elastic strength potentiality of joint material.In the technical program, also owing to have employed the hermetically-sealed construction that elliptical arc surface and taper seat combine, the generation of its contact stress produced by the interactional radial load of internal and external screw thread joint, thus sealing surface contact stress is not by the impact of joint axial load, thus ensure that the reliable and stable of sealing effectiveness, sealing structure also produces enough interference elastic deformations at contact surface place, large with sealing contact surface, sealing is tight, defines hermetically sealed effect.More due in technical solution of the present invention, Taper Pipe external screw thread and be attached thereto the taper hole internal thread connect and all adopt two sections of helicitic textures, and the back segment thread pitch T1 of large end side is greater than near the leading portion thread pitch T2 of small end side, like this 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 greater than the elastic deformation amount of back segment, the stressed of back segment screw thread is forced to shift to leading portion screw thread, thus efficiently solve joint connections threads serious uneven problem along its length, the stressed large portion of traditional jointing structure screw thread is avoided to concentrate on the phenomenon of root 3 tooth, stressed and the stress on each ridge is made to become even, drastically increase torque resistant and the stress supporting capacity of joint.This structure can also strengthen the axial prestrain stress of joint further simultaneously, and the elastic strength of joint material is strengthened again, and joint supporting capacity can improve more than 2 times; Pre-load arrangement, except its supporting capacity of enhancing, is also effectively improved the stress of screw thread, is reduced and stabilize the internal force peak value in each tooth of screw thread, avoid stress to concentrate the extraordinary failure with joint.A kind of preferred embodiment of the present invention, a major cross-sectional axis summit of described elliptical arc surface is adjacent with Taper Pipe last ridge externally threaded, and a cross-section minor axis summit of this elliptical arc surface is positioned on outer circular bead surface.This structure achieves the transition in threaded portion and screw thread datum hole portion preferably, and be conducive to the level and smooth of sealing surface and coordinate smoothly, minimizing is twisted access node and closed resistance, and rational in infrastructure, is convenient to make processing.
A kind of preferred embodiment of the present invention, a major cross-sectional axis summit of described elliptical arc surface is adjacent with Taper Pipe last ridge externally threaded, and a cross-section minor axis summit of this elliptical arc surface is positioned on outer circular bead surface.This structure achieves the transition in threaded portion and screw thread datum hole portion preferably, and be conducive to the level and smooth of sealing surface and coordinate smoothly, minimizing is twisted access node and closed resistance, and rational in infrastructure, is convenient to make processing.
Preferably, the conical bore tapering in described internal thread stomidium portion equals the tapering of taper hole internal thread.This structure is convenient to processing, is convenient to assembly connection, is also conducive to the level and smooth of sealing surface and coordinates smoothly.
Preferably, the described conical bore tapering in internal thread stomidium portion and the tapering of taper hole internal thread are 1:6 or 1:16.This thread taper is conducive to realizing standardization making and mass production, is also conducive to accessory exchange in actual use.
Preferably, inclination alpha=10 ° ~ 20 ° of described outer circular bead surface; 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 radial contact force to arc sealing surface, thus guarantee tight sealing effectiveness.
Preferably, the inclination alpha of described outer circular bead surface is greater 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 performance is more excellent.
Another preferred embodiment of the present invention, the pitch T of described leading portion external screw thread and leading portion internal thread
2, the pitch T of back segment external screw thread and back segment internal thread
1, T2=(1.00 ~ 1.10) and T
1.This pitch difference both to have ensure that between internal and external screw thread rational elastic deformation amount in the engagement condition, thus the stressed and stress effectively on uniform screw thread tooth; This pitch difference also ensure that and reasonably preloads, to reach enough elastic strengths.
Preferably, the pitch T2 of described leading portion external screw thread and leading portion internal thread, the pitch T of back segment external screw thread and back segment internal thread
1, T
2=(1.01 ~ 1.05) T
1.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 L
2, the reach of back segment external screw thread and back segment internal thread is L
1, L
2=(1.00 ~ 1.10) L
1.This structure can adapt to the change needs of pitch difference of the present invention preferably.
Preferably, described back segment external screw thread is equal with the externally threaded tapering of leading portion, is separated with external screw thread transition part between back segment external screw thread and leading portion external screw thread; The tapering of described back segment internal thread and leading portion screw thread is equal, is separated with internal thread transition part between back segment internal thread and leading portion internal thread.This structure is convenient to processing and fabricating and is linked and packed, and is conducive to reducing stubborn access node and closes resistance.
Another kind of the present invention is used for the drill rod connecting device of ultra-deep oil gas well drilling, comprises male connection and carries out with it the female adapter that is threaded; This male connection is provided with outer circular bead surface and external screw thread front end face, is disposed with taper pipe thread base portion, Taper Pipe external screw thread and external screw thread leading section vertically between circular bead surface to external screw thread front end face outside; Described female adapter is provided with face, female adapter main side and interior circular bead surface, between this face, female adapter main side and interior circular bead surface, is disposed with internal thread stomidium portion, taper hole internal thread and internal thread datum hole portion vertically; Face, female adapter main side in described female adapter is the anchor ring with inclination angle, and described internal 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 oval cross section major semiaxis length of this elliptical arc surface is b, the oval cross section minor axis length of elliptical arc surface is 2a, and this minor axis length 2a equals the conical bore tapering in internal thread stomidium portion with the ratio 2a/b of major semiaxis length b; Described male connection is also provided with circular bead surface in external screw thread, and in this external screw thread, Taper Pipe external screw thread is separated into back segment external screw thread and leading portion external screw thread by circular bead surface, and the externally threaded end diameter of back segment is greater than the externally threaded outside diameter of leading portion; Described female adapter is also provided with circular bead surface in internal thread, and in this internal thread, taper hole internal thread is separated into back segment internal thread and leading portion screw thread by circular bead surface, and the end diameter of back segment internal thread is greater than the outside diameter of leading portion screw thread.In the present invention, except employing preceding solution, additionally use connection segment screw thread and three shoulder structures, therefore this technical scheme not only has the advantage of aforementioned structure, and has the unique distinction of self.First due between front and rear sections connecting thread, set up shoulder in screw thread, first the setting of shoulder in screw thread, the even further again each ridge of thread segment stressed, research shows that two shoulder structures are takeed on it compared with separate unit and stressedly significantly to be optimized, and makes the several pitch thread of the root in traditional structure concentrate stressed, shifts to its nose threads tooth, but " recessed district " that the middle part ridge of its connecting thread is still stressed, this phenomenon seems particularly outstanding in ultradeep well and Holes of Complicated Wells.And arranging of middle shoulder can make that the two ends of connecting thread are stressed shifts to middle part, the stressed peak value in two ends can obtain " scabbling " further, and not only connecting thread is stressed more even vertically, and integrated carrying ability promotes greatly.Also owing to adding middle shoulder in the present invention, prestressed distribution is more easily adjusted, thus the unbalanced stress eliminated the change of Taper Pipe diameter and bring, make the supporting capacity of joint stronger, stressed more reasonable.
A kind of preferred embodiment of the present invention, the pitch of described back segment external screw thread and back segment internal thread is T1, and the pitch of leading portion external screw thread and leading portion internal thread is T2; Back segment external screw thread is corresponding with the position of back segment internal thread, and leading portion external screw thread is corresponding with the position of leading portion internal thread; Described pitch T2 is more than or equal to pitch T1.Conical surface diameter due to leading portion screw thread place is in the present invention less than the conical surface diameter at back segment screw thread place, and back segment screw thread can bear larger moment of torsion and stress, effectively can force the stressed to the transfer of leading portion screw thread of back segment screw thread after adopting this structure, thus solve joint connections threads serious uneven problem along its length well.
Preferably, the pitch T of described leading portion external screw thread and leading portion internal thread
2, the pitch T of back segment external screw thread and back segment internal thread
1, T2=(1.00 ~ 1.10) and T
1.This pitch difference both to have ensure that between internal and external screw thread rational elastic deformation amount in the engagement condition, thus the stressed and stress effectively on uniform screw thread tooth; This pitch difference also ensure that and reasonably preloads, to reach enough elastic strengths.
Preferably, the pitch T2 of described leading portion external screw thread and leading portion internal thread, the pitch T of back segment external screw thread and back segment internal thread
1, T
2=(1.01 ~ 1.05) T
1.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 L
2, the reach of back segment external screw thread and back segment internal thread is L
1, L
2=(1.00 ~ 1.10) L
1.This structure can adapt to the change needs of pitch difference of the present invention preferably.
A kind of preferred embodiment of the present invention, in described external screw thread, circular bead surface is the anchor ring perpendicular to male connection axial line, and in described internal thread, circular bead surface is the anchor ring perpendicular to female adapter axial line.When this structure makes internal and external screw thread joint connect cooperation, middle circular bead surface is defined again between main circular bead surface and secondary circular bead surface, multiple circular bead surfaces of such formation more effectively improve the overall force-bearing situation of joint, promotion moment of torsion and stress threadingly length direction distribute more equably, drastically increase torque resistant and the supporting capacity of integral joint; The multiple lengths of many circular bead surfaces is poor and priority that is that formed combines, also create the axial prestrain stress of segmentation in the thread engagement section of male connection and female adapter and adjacent area thereof, make the Anti-pull-press of tool joint bulk material, counter-bending and anti-torsional strength is fully used, and give full play to the elastic strength potentiality of joint body material, significantly enhance torque resistant and the supporting capacity of tool joint.
Another kind of preferred embodiment of the present invention, in described external screw thread, circular bead surface is the annular folding face arranged along male connection radial direction, the folding face angle γ in this folding face
1; In described internal thread, circular bead surface is the folding face arranged along female adapter radial direction; The folding face angle γ in this folding face
2; The folding face angle γ of circular bead surface in external screw thread
1be more than or equal to the folding face angle γ of circular bead surface in internal thread
2.This structure is except effectively improving the overall force-bearing situation of joint, and promotion moment of torsion and stress threadingly length direction distribute more equably, drastically increase torque resistant and the supporting capacity of integral joint; Also there is fabulous internal and external screw thread and engage centering effect, to improve integral rigidity and the intensity of whole piecing devices.This structure also improves the sealing performance of whole piecing devices.
Preferably, the folding face angle γ of circular bead surface in described external screw thread
1=150 ° ~ 160 °; The folding face angle γ of circular bead surface in described internal thread
2=150 ° ~ 160 °.This folding face angle is convenient to processing and assembling.
A kind of preferred embodiment of the present invention, a major cross-sectional axis summit of described elliptical arc surface is adjacent with Taper Pipe last ridge externally threaded, and a cross-section minor axis summit of this elliptical arc surface is positioned on outer circular bead surface.This structure achieves the transition in threaded portion and screw thread datum hole portion preferably, and be conducive to the level and smooth of sealing surface and coordinate smoothly, minimizing is twisted access node and closed resistance, and rational in infrastructure, is convenient to make processing.
Preferably, the conical bore tapering in described internal thread stomidium portion equals the tapering of taper hole internal thread.This structure is convenient to processing, is convenient to assembly connection.
Preferably, the described conical bore tapering in internal thread stomidium portion and the tapering of taper hole internal thread are 1:6 or 1:16.This thread taper is conducive to realizing standardization making and mass production, is also conducive to accessory exchange in actual use.
Preferably, inclination alpha=10 ° ~ 20 ° of described outer circular bead surface; 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 radial contact force to arc sealing surface, thus guarantee tight sealing effectiveness.
Preferably, the inclination alpha of described outer circular bead surface is greater 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 performance is more excellent.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
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 the partial structurtes schematic diagram of male connection of the present invention and female adapter link position;
Fig. 4 is the partial enlarged drawing at I place in structure shown in Fig. 3;
Fig. 5 is the partial enlarged drawing at II place in structure shown in Fig. 3;
Fig. 6 is the partial structurtes schematic diagram of the another kind of male connection of the present invention and female adapter link position;
Fig. 7 is the threaded connection relation analysis chart of internal and external screw thread joint in structure shown in Fig. 6;
Fig. 8 is the partial structurtes schematic diagram of another male connection of the present invention and female adapter link position;
Fig. 9 is the threaded connection relation analysis chart of internal and external screw thread joint in structure shown in Fig. 8;
Figure 10 is the another kind of concrete structure schematic diagram of Fig. 8 illustrated embodiment;
Figure 11 is the partial enlarged drawing at III place in structure shown in Fig. 8;
Figure 12 is the partial enlarged drawing of in structure shown in Fig. 8 IV.
In figure, 1-male connection, 2-male connection body, 3-male connection tube chamber, 4-outer circular bead surface, 5-taper pipe thread base portion, 6-Taper Pipe external screw thread, 61-back segment external screw thread, 62-external screw thread transition part, 63-leading portion external screw thread, 7-external screw thread leading section, 8-external screw thread front end face, face, 9-female adapter main side, 10-internal thread stomidium portion, 11-taper hole internal thread, 111-back segment internal thread, 112-internal thread transition part, 113-leading portion internal thread, 12-internal thread datum hole portion, 13-interior circular bead surface, 14-female adapter, 15-female adapter body, 16-female adapter tube chamber, circular bead surface in 17-external screw thread, circular bead surface in 18-internal thread.
Detailed description of the invention
The male connection 1 that two shoulder drilling rod is all connected by mutual screw-threaded engagement and female adapter 14 form.One end of its male connection 1 is fixedly connected with a drilling rod one end, the other end of male connection 1 is then connected with female adapter 14 by connecting thread, the other end of female adapter 14 is then fixedly connected with another root drilling rod, connects with the spreading that this completes each joint drilling rod.
As shown in Figure 1, traditional double shoulder drilling rod male connection 1 comprise 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 fixedly connected with end with drilling rod, and the other end is then threaded ends.The end portion that is threaded 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 perpendicular to body axis, and external screw thread front end face 8 is positioned at the nose place of body and also perpendicular with body axis.The male connection body 2 of circular bead surface 4 to external screw thread front end face 8 outside sets gradually taper pipe thread base portion 5, Taper Pipe external screw thread 6 and external screw thread leading section 7 vertically.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 large last screw thread of end 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 most last ridge of Taper Pipe external screw thread 6 small end and external screw thread front end face 8.The center line of the center line of taper pipe thread base portion 5, the center line 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, also can be 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 shown in Figure 2, traditional female adapter 14 also includes the female adapter body 15 be made up of forging, and female adapter body 15 is also 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 fixedly connected with drilling rod, and the other end is threaded ends.This end portion that is threaded is provided with face, female adapter main side 9, this face, female adapter main side 9 is the anchor ring 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, be 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 of face, female adapter main side 9 to interior circular bead surface 13 is disposed with internal thread stomidium portion 10, taper hole internal thread and internal thread datum hole portion 12 vertically.Internal 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 large end of taper hole internal thread 11.Internal thread datum hole portion 12 is also a cylindrical hole vertical with body axis, and it is between the most last ridge of taper hole internal thread 11 small end and interior circular bead surface 13.Internal thread stomidium portion 10, taper hole internal thread 11 place round platform, and the center line in internal thread datum hole portion 12 all with the centerline collineation of female adapter body 15.The same taper hole internal thread 11 be meshed with Taper Pipe external screw thread 6 is metric system, English system or taper pipe thread made in U.S.A.
The shaft core position of male connection body 2 is provided with male connection tube chamber 3 as shown in Figure 3, Figure 4, 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, Taper Pipe external screw thread 6 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 perpendicular to body axis, and it is positioned at the nose of external screw thread leading section 7; Taper Pipe external screw thread 6 adopts taper pipe thread structure, and its tapering is 1 ﹕ 6 or 1 ﹕ 16, and this thread taper is conducive to realizing standardization making and mass production, is also conducive to accessory exchange in actual use.The difference of the present invention and prior art is: outer circular bead surface 4 is for having the face of cylinder of forward leaning angle, this outer circular bead surface 4 and the diametric inclination alpha of male connection body 2 should be selected between 10 °-20 °, prioritizing selection α=15 °, 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 radial contact force to arc sealing surface, thus guarantee tight sealing effectiveness.Taper pipe thread base portion 5 adopts elliptical arc surface for non-cylindrical, on the cross section passing through male connection body 2 axis, the oval major semiaxis length in cross section of this elliptical arc surface is b, 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 perpendicular to the axial line of male connection body 2, this major axis summit also can be do not surpass in the adjacent area of a pitch at last ridge of Taper Pipe external screw thread 6 certainly.A 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.Cross section ellipse short shaft length is 2a, and the oval major semiaxis length in cross section is b, and this minor axis length 2a equals the conical bore tapering in internal thread stomidium portion 10 with the ratio 2a ﹕ b of major semiaxis length b.
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 also 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 internal thread stomidium portion 10, taper hole internal thread 11 and internal thread datum hole portion 12 vertically.The difference of the present invention and prior art is: above-mentioned face, female adapter main side 9 is for having the face of cylinder at inclination angle, between diametric angle of inclination beta=10 of this face, female adapter main side 9 and female adapter body 15 ° ~ 20 °, prioritizing selection β=15 °.Internal 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 namely oval 2a ﹕ b equals this conical bore tapering.Preferably the conical bore tapering in internal thread stomidium portion 10 equals the tapering of taper hole internal thread 11, and both also can adopt different taperings certainly.In order to strengthen the splicing results of internal and external screw thread joint, the inclination alpha of outer circular bead surface 4 can be made to be greater than the angle of inclination beta in face, female adapter main side 9, as adopted α=16 °, β=15 ° etc.
When male connection 1 is tightened mutually with female adapter 14, Taper Pipe external screw thread 6 and taper hole internal thread 11 spin mutually, first outer circular bead surface 4 and face, female adapter main side 9 are contacted with each other, because outer circular bead surface 4 has towards identical inclination angle with face, female adapter main side 9, thus the nose portion card of female adapter 14 is injected between outer circular bead surface 4 and taper pipe thread base portion 5, this structure can strengthen the radial load between internal thread stomidium portion 10 and taper pipe thread base portion 5.Under the continuation effect of connecting 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 generation axle preloads.In the process, the conical bore face in internal thread stomidium portion 10 contacts with the elliptical arc surface of taper pipe thread base portion 5 gradually and produces elastic deformation area A.As shown in Figure 4, the elastic deformation sealing area A formed, because oval 2a ﹕ b equals the tapering of internal thread stomidium portion 10 conical bore, in rundown process, internal and external screw thread joint can form the sealing area A in wedging structure long and narrow gently, the sealing area A contact stress of this wedging mainly radially distributes and is not subject to the impact of axial load, and this form of structure easily forms longer sealing contact surface vertically and elastic packing region long and narrow gently, reach tight, reliable sealing effectiveness.
Figure 6 shows that the another kind of technical scheme of the present invention, in the technical program except Taper Pipe external screw thread 6 is different from above-described embodiment with the form of structure of taper hole internal thread 11, all the other are identical.In figure 6, Taper Pipe external screw thread 6 in male connection 1 adopts 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 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 is less than the root diameter (RD) of back segment external screw thread 61 small end screw thread, and the end diameter of external screw thread transition part 62 is less than the root diameter (RD) that leading portion external screw thread 63 holds greatly screw thread.Correspondingly, the taper hole internal thread 11 of female adapter 14 also adopts segmentation structure, this taper hole internal thread 11 is separated into back segment internal thread 111 and leading portion internal thread 113, internal thread transition part 112 is separated with between back segment internal thread 111 and leading portion internal thread 113, internal thread transition part 112 is short conical bore, this internal thread transition part 112 outside diameter is greater than the root diameter (RD) of back segment internal thread 111 small end screw thread, and internal thread transition part 112 end diameter is greater than the root diameter (RD) that leading portion internal thread 113 holds greatly screw thread.
As shown in Figure 7, when internal and external screw thread joint is interconnected, back segment external screw thread 61 spins mutually with back segment internal thread 111, and leading portion external screw thread 63 spins mutually with leading portion internal thread 113, the pitch T of intermeshing leading portion external screw thread 63 and leading portion internal thread 113
2be greater than the pitch T of intermeshing back segment external screw thread 61 and back segment internal thread 111
1, T
2/ T
1should select between 1.0-1.1, as prioritizing selection T
2=1.05T
1, this pitch difference both to have ensure that between internal and external screw thread rational elastic deformation amount in the engagement condition, thus the stressed and stress effectively on uniform screw thread tooth; This pitch difference also ensure that and reasonably preloads, to reach enough elastic strengths.The reach L of leading portion external screw thread 63 and leading portion internal thread 113
2be more than or equal to the reach L of back segment external screw thread 61 and back segment internal thread 111
1, L
2/ L
1should select between 1.0-1.1, preferred L
2=L
1or L
2=1.05 L
1, this structure can adapt to the change needs of pitch difference of the present invention preferably.Adopt the structure of above-mentioned decreasing worm-pitch, when internal and external screw thread joint screws in a fixing turn (or angle) mutually, forward and backward two thread segments can produce different displacements, and leading portion screw thread is slightly faster than back segment screw thread.Such one side by the torque of back segment screw thread and stress to the transfer of leading portion screw thread, can change torque stress when being threaded and concentrates on the force-bearing situation of a few ridge in screw thread rear portion, connecting thread stressed more reasonable, and the supporting capacity of whole screw thread is greatly improved.This structure in turn enhances the axial prestrain stress of joint on the other hand, and not only joint supporting capacity strengthens, and effectively reduces the internal force peak value on ridge.
Diagram 8 is another technical scheme of the present invention, and in the inventive solutions, except Taper Pipe external screw thread 6 is different from above-described embodiment with the form of structure of taper hole internal thread 11, all the other are identical.In fig. 8, the Taper Pipe external screw thread 6 of male connection 1 is two-stage structure, male connection 1 is also provided with circular bead surface 17 in external screw thread, in this external screw thread, Taper Pipe external screw thread 6 sections is divided into back segment external screw thread 61 and leading portion external screw thread 63 by circular bead surface 17, the thread segment of back segment external screw thread 61 ends at circular bead surface 17 in external screw thread, the thread segment of leading portion external screw thread 63 starts from circular bead surface 17 in external screw thread, the end diameter of back segment external screw thread 61 is greater than the outside diameter of leading portion external screw thread 63, in external screw thread, circular bead surface 17 is the anchor ring of male connection body 2 axial line perpendicular to male connection 1.Correspondingly, the taper hole internal thread 11 of female adapter 14 is also two-stage structure, female adapter 14 is also provided with circular bead surface 18 in internal thread, in this internal thread, taper hole internal thread 11 sections is divided into back segment internal thread 111 and leading portion internal thread 113 by circular bead surface 18, back segment internal thread 111 ends at circular bead surface 18 in internal thread, leading portion internal thread 113 starts from circular bead surface 18 in internal thread, the end diameter of back segment internal thread 111 is greater than the outside diameter of leading portion internal thread 113, and in internal thread, circular bead surface 18 is the anchor ring perpendicular to female adapter 14 axial line.
As shown in Figure 9, when internal and external screw thread joint is interconnected, back segment external screw thread 61 is connected with back segment internal thread 111, and leading portion external screw thread 63 spins mutually with leading portion internal thread 113, and in external screw thread, in circular bead surface 17 and internal thread, circular bead surface 18 contacts laminating.Same front and rear sections screw thread also adopts different pitch, i.e. the pitch T of intermeshing leading portion external screw thread 63 and leading portion internal thread 113
2be greater than the pitch T of intermeshing back segment external screw thread 61 and back segment internal thread 111
1, T
2/ T
1should select between 1.0-1.1.Therefore, in the present embodiment, not only there is the all-sealed structure of elliptical arc surface and conical surface contact, and there are two sections of helicitic textures of decreasing worm-pitch, have more three shoulder structures.Therefore the tool joint with this structure is when mutually spinning, first outer circular bead surface 4 and face, female adapter main side 9 contact with each other, then in external screw thread in circular bead surface 17 and internal thread circular bead surface 18 contact, last external screw thread front end face 8 and interior circular bead surface 13 contact with each other again.In this structure, multiple stage shoulder is not only adopted to share drilling rod moment of torsion and stress, and the common use of reducing-pitch thread and many shoulders, make the stressed more reasonable of whole joint, thread segment moment of torsion and stress evenly, therefore there is high anti-torsion and supporting capacity, and its sealing is very tight reliable.
As shown in Figure 10, this structure is to further optimization embodiment illustrated in fig. 8.Structure shown in Figure 10 is except circular bead surface in external screw thread 17 is different with the structure of circular bead surface in internal thread 18, and all the other are identical with Fig. 8 structure.As shown in figure 11, the anchor ring in circular bead surface 17 to be the cross section radially arranged be folding face in the external screw thread in male connection 1, the angle in this folding face is γ 1, stressed and physical dimension can select in 150 °-160 ° according to drilling rod.As shown in figure 12, in the internal thread of female adapter 14, circular bead surface 18 is also the anchor ring that the cross section radially arranged is folding face, and this folding face angle γ 2 stressed and physical dimension should select according to drilling rod equally between 150 °-160 °.In practical structures, in order to further reasonable mechanical, improve coupling stiffness and the stability of whole joint, in external screw thread, folding face angle γ 1 prioritizing selection of circular bead surface 17 is a bit larger tham the folding face angle γ 2 of circular bead surface 18 in internal thread, but at least folding face angle γ 1 equals folding face angle γ 2.This carry out with folding face be connected, not only significantly enhance anti-torsion and the supporting capacity of nipple, and internal and external threads joint connection centering performance good, coupling stiffness strengthen.
Above-mentioned only enumerated the present invention some preferred embodiment; obviously the present invention is not limited thereto; those skilled in the art is when without prejudice to its general principles; can also make a lot of improvement and distortion, these improve and distortion all should be considered as falling within the scope of protection of the present invention.
Claims (10)
1., for a drill rod connecting device for ultra-deep oil gas well drilling, comprise male connection (1) and carry out with it the female adapter (14) that is threaded; This male connection (1) is provided with outer circular bead surface (4) and external screw thread front end face (8), between circular bead surface (4) to external screw thread front end face (8), is disposed with taper pipe thread base portion (5), Taper Pipe external screw thread (6) and external screw thread leading section (7) outside vertically; Described female adapter (14) is 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 internal thread stomidium portion (10), taper hole internal thread (11) and internal thread datum hole portion (12) vertically; It is characterized in that: the face, female adapter main side (9) in described female adapter (14) is for having the anchor ring at inclination angle, and described internal thread stomidium portion (10) is conical bore; Outer circular bead surface (4) in described male connection (1) is for having the anchor ring at inclination angle, the taper pipe thread base portion (5) of male connection (1) is elliptical arc surface, the oval cross section major semiaxis length of this elliptical arc surface is b, the oval cross section minor axis length of elliptical arc surface is 2a, and this minor axis length 2a equals the conical bore tapering in internal thread stomidium portion (10) with the ratio 2a/b of major semiaxis length b; Described male connection (1) is also provided with circular bead surface in external screw thread (17), in this external screw thread, Taper Pipe external screw thread (6) is separated into back segment external screw thread (61) and leading portion external screw thread (63) by circular bead surface (17), and the end diameter of back segment external screw thread (61) is greater than the outside diameter of leading portion external screw thread (63); Described female adapter (14) is also provided with circular bead surface in internal thread (18), in this internal thread, taper hole internal thread (11) is separated into back segment internal thread (111) and leading portion internal thread (113) by circular bead surface (18), and the end diameter of back segment internal thread (111) is greater than the outside diameter of leading portion internal thread (113); In described external screw thread, circular bead surface (17) is the annular folding face arranged along male connection (1) radial direction, the folding face angle γ in this folding face
1; In described internal thread, circular bead surface (18) is the folding face arranged along female adapter (14) radial direction; The folding face angle γ in this folding face
2; The folding face angle γ of circular bead surface (17) in external screw thread
1be more than or equal to the folding face angle γ of circular bead surface in internal thread (18)
2.
2. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1, is characterized in that: the pitch of described back segment external screw thread (61) and back segment internal thread (111) is T
1, the pitch of leading portion external screw thread (63) and leading portion internal thread (113) is T
2; Back segment external screw thread (61) is corresponding with the position of back segment internal thread (111), and leading portion external screw thread (63) is corresponding with the position of leading portion internal thread (113); Described pitch T
2be more than or equal to pitch T
1.
3. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1 and 2, is characterized in that: the pitch T of described leading portion external screw thread (63) and leading portion internal thread (113)
2, the pitch T of back segment external screw thread (61) and back segment internal thread (111)
1, T
2=(1.00 ~ 1.10) T
1.
4. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 3, is characterized in that: the pitch T of described leading portion external screw thread (63) and leading portion internal thread (113)
2, the pitch T of back segment external screw thread (61) and back segment internal thread (111)
1, T
2=(1.01 ~ 1.05) T
1.
5. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1 and 2, is characterized in that: the reach of described leading portion external screw thread (63) and leading portion internal thread (113) is L
2, the reach of back segment external screw thread (61) and back segment internal thread (111) is L
1, L
2=(1.00 ~ 1.10) L
1.
6. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1, it is characterized in that: a 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).
7. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1 or 6, is characterized in that: the conical bore tapering of described internal thread stomidium portion (10) equals the tapering of taper hole internal thread (11).
8. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1 or 6, is characterized in that: the conical bore tapering of described internal thread stomidium portion (10) and tapering 1:6 or 1:16 of taper hole internal thread (11).
9. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1, is characterized in that: 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 °.
10. the drill rod connecting device for ultra-deep oil gas well drilling according to claim 1 or 9, is characterized in that: the inclination alpha of described outer circular bead surface (4) is greater than or equal to the angle of inclination beta in face, female adapter main side (9).
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| CN201410349696.9A CN104074473B (en) | 2014-07-22 | 2014-07-22 | Drill rod connecting device for drilling of ultra-deep oil gas well |
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|---|---|---|---|
| CN201410349696.9A CN104074473B (en) | 2014-07-22 | 2014-07-22 | Drill rod connecting device for drilling of ultra-deep oil gas well |
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| CN104074473B true CN104074473B (en) | 2015-05-13 |
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|---|---|---|---|
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108266133A (en) * | 2016-12-30 | 2018-07-10 | 中国石油天然气股份有限公司 | Drilling tool production method and drilling tool |
| CA2984826A1 (en) * | 2017-11-07 | 2019-05-07 | Complete Group Technologies Ltd. | Multiple tapered threaded connection |
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| CN104074473A (en) | 2014-10-01 |
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