CN100458255C - Production by plastic expansion of a sealed tubular joint with inclined abutting surface(s) - Google Patents

Abstract

The invention relates to a sealed tubular joint, initially comprising a first male tubular element (EM), with a male thread (FM), a first annular lip (L1), with a first axial abutting surface (SB1), a first internal surface (SI1), a section of a first external surface (SE1), a second abutting surface (SB2) and a second female tubular element (EF), with a female thread (FF), matching the male thread (FM), a second annular lip (L2), with a third abutting surface (SB3), a second external surface (SE2), arranged to face the first internal surface (SI1), a second internal surface (SI2) and a fourth axial abutting surface (SB4), supporting the first abutting surface (SB1) and defining, in particular with the second external surface (SE2), an annular housing (LO), matching the first lip (L1). The second (SB2) and third (SB3) abutting surfaces are initially conical with angles of inclination which are effectively identical and which permit, on screwing, the contact of the second abutting surface (SB2) against the third abutting surface (SB3), generating a first radial locking and sealing contact of the first internal surface (SI1) or external surface (SE1) against the second external surface (SE2), or the third internal surface (SI3), and then, with a diametrical expansion in the region of the plastic deformation by means of an axially-displaceable expansion tool, the first external surface (SE1) and the third internal surface (S13) are forced to locally define a second locking and sealing contact.

Description

Has of the enforcement of the tubular SEALING FITTING of inclination stop surface by plastic expansion

Technical field

The present invention relates to the tube-shaped joint field, for example be used for the tube-shaped joint of hydrocarbon well or similar well resemble the geothermal well.

Background technique

These joints generally are used to make the big pipe of length to be connected to each other, and the big pipe of length is connected with sleeve pipe.Therefore, they can constitute encasement tube (or " sleeve ") tubing string or produce pipe (or " pipeline ") tubing string.

In addition, these joints must stand huge flexural stress, tensile stress, compressive stress, sometimes be twisting stress and inside and outside between huge pressure reduction.In addition, these joints must also be airtight sometimes.Therefore, joint usually is a thread type, sleeve pipe and pipe generally be steel or make with the alloy with high elastic limit (but also heat treatment forms).Under the situation of inipple, tightness is often guaranteed by the sealing stop surface of the tight contact of " metal to metal " type.

In order to reduce the initial volume of pipe, and alternatively for the Drilling diameter uniformly also, have the people to propose, especially document US 6,604,763 and WO 03/071086 propose, by means of an expanding tool that is called " ball ", pipe is expanded on diameter.The sealing thread joint, for example the sealing thread joint described in the EP0488912 can be stood this expansion, but impairs its sealability when expansion, have an end-fitting of protruding positive formula element that inserts sealing surface when expansion towards axis tilt (" banana " effect), thereby destroy sealing.

In order to address this problem, the applicant proposes a kind of threaded tubular joint in document WO 02/01102, wherein, the insertion joint is furnished with an annular that is inserted in the groove and refers to bar in the end, groove forms a supporting member that refers to bar, stops during expansion to insert to refer to that bar is towards axis tilt.

But this inipple greater than 10% o'clock, does not have sufficiently high sealability at spreading rate.In fact, the distortion that the expansion ball causes is moved even is eliminated and inserts the contact that refers between bar and the groove, thereby moves, reduces even eliminate the tight contact between the sealing surface.

So-called " closely contact " is meant the contact that demonstrates the contact pressure between two surface of contact here.Contact pressure is high more, and the hydrodynamic pressure that joint can bear can be high more, and sealing is not destroyed except that the inner or outside hydrodynamic pressure that may apply of inipple, axial tension or compression load regulative contact pressure, thus change sealability.In other words, according to the mode of execution of these joints, in the face of interior pressure or external pressure, its sealing may be inequality, and is also unstable, changes with load.

In order to change this situation, the applicant is in document FR 02/03842 (registration on March 27th, 2002, the domestic priority requisition of the document FR 02/00055 of registration on January 3rd, 2002) in the tubular SEALING FITTING of a kind of metal/metal is proposed, it is furnished with one and refers to bar (or lip) in the annular described in the WO 02/01102, have after expansion brute force and be pressed on the protruding positive formula and the recessed cloudy formula shoulder of the inclination on another, shoulder on the recessed cloudy formula part is made of the limit of a groove, shoulder on the protruding positive formula element can be pre-existing in, perhaps when expansion, inside belling sun formula element forms in the bottom of groove.

This joint design becomes under usually greater than 10% high spreading rate seal, still, when desired sealability is very high in various load modes, its before expansion and sealability afterwards may deficiency.

Summary of the invention

Therefore, the present invention is intended to change this situation, especially for various load modes in the sealing of anti-highly pressurised liquid before the expansion and before expansion and afterwards aspect the sealing of anti-pressurized gas.

For this reason, the present invention proposes a kind of distensible tube-shaped joint, and it comprises:

* one first tubular member, it has a first portion that is furnished with external screw thread on the one hand, have one on the other hand and extend the second portion of described first portion, described second portion comprises: (i) one first outer surface, (ii) one first annular lip, it has one first axial stop face and one first internal surface, is limited by described first outer surface on one section axial length, and (iii) one second stop surface

* one second tubular member, it has: first, female thread, it is corresponding to described external screw thread, and twist thereon, second, one second annular lip, it has the 3rd stop surface, second outer surface and one second internal surface with respect to first internal surface layout that is bearing on second stop surface, the three, one four-axial stop surface, the and the 4th, one the 3rd internal surface, it extends between four-axial stop surface and the female thread, limits an annular cavity corresponding with first lip together with second outer surface and the 4th stop surface.

This joint is characterised in that, the second and the 3rd stop surface is the conical surface, it has with respect to one and is the horizontal substantially the same inclination of Plane Angle with longitudinal direction, described angle is selected to, second stop surface is bearing on the 3rd stop surface, can realize one of the inside and outside first surface first radially tight seal contact on second outer surface or the 3rd internal surface respectively of first lip, like this, when later on the distensible tube T-joint being carried out expanded in diameter in the plastic deformation scope, first outer surface can locally determine that second tight seal contacts with the 3rd internal surface.

Like this, before the expansion of carrying out high expanded in diameter rate (until about 35%),,, guarantee higher quality seal by the cooperation of first and second lips with afterwards.

Distensible tube T-joint of the present invention can have other performances independent or combination, especially:

Originally-the first lip and chamber can have selected shape, so that the first closely only formation after second stop surface is bearing on the 3rd stop surface of contact,

Originally the inclination of the-the second and the 3rd stop surface can be approximately+and 5 ° to+30 ° approximately,

-the first lip can determine between its first internal surface and second outer surface that after expansion auxiliary tight seal contacts in when expansion along the curvature of the longitudinal axis direction of joint,

-the first stop surface can be arranged to be bearing on the 4th stop surface, thereby makes first lip carry out axial compression in regime of elastic deformation,

-the second lip can have one second outer surface, and it is originally at itself and the position that the 3rd stop surface is connected, have one with respect to longitudinal direction tilt one about 8 ° to about 12 °, preferably equal about 10 ° annular portion,

-the first lip can have one first internal surface, its originally with respect to longitudinal direction tilt one about 0.1 ° to about 15 ° angle,

-the second lip extension and the ratio between the chamber extension in a lateral direction in a longitudinal direction can be about 1 to about 3, preferably about 1.2 to about 1.6,

The screw thread of-external screw thread and female thread can be furnished with a carrying limit, and it has a negative angle, and-3 ° to-15 ° approximately approximately,

The screw thread of-external screw thread and female thread can be furnished with an engagement limit, and it has a positive angle ,+10 ° to+30 ° approximately approximately.In this case, after tightening and before expansion, external screw thread and female thread can mesh at it has the axial clearance of an about 0.05mm to about 0.3mm between limit,

Originally-the first tubular member can before its first portion, have a tapered slope in its first outer surface, when making it when first portion moves, limits inwardly first a local annular recess.In this case, the inclined-plane can with respect to longitudinal direction have one continuous basically, about 8 ° to about 12 ° gradient,

-the first tubular member can be furnished with a second portion, it is originally at direction the 4th internal surface place of extending second stop surface of first portion on one day, has a selected part annular thickness surplus, the 3rd internal surface can have a groove at a selected position, and it is suitable for being arranged in basically local thickness surplus place after tightening.In this case, first outer surface can have an annular shoulder after expanded in diameter, and it has the configuration of at least a portion groove, and seals contact closely with it,

Originally-the first tubular member can on its internal surface with respect to external screw thread, have a taper undergauge at its first portion place, wherein determines one second local annular recess.In this case, originally undergauge can increase basically continuously along the about 2 ° of extremely about 20 ° gradients with respect to longitudinal direction A,

Originally-groove can have at least two curved portion, and it is separated by a middle body that is cylindricality basically alternatively.In this case, originally these parts can have substantially the same radius of curvature, and for example about 2mm is to about 20mm.The maximum value of the radial depth that originally groove has preferably is selected to, the product (produit) of the stretching efficiency factor (l ' efficacit é du joint en traetion) of the smallest cross-sectional of part and joint usually of the pipe that the material section of the bottom of groove belongs to greater than first and second tubular member.So-called " the common part of pipe " be meant away from middle body its two end part, the diameter substantial constant,

-external screw thread and female thread are preferentially selected in tapered thread and cylindrical thread, and each all is formed at least a portion tubular member,

-described second tubular member can belong to an adapter sleeve of the substantial symmetry of recessed the moon/recessed cloudy formula, and described first tubular member belongs to an end of the big pipe of a length.Therefore, sleeve pipe can have a middle body that is extended by two second tubular member in both sides, originally it be furnished with an annular region on an outer surface, its thickness (sous-é aisseur) in shortage is selected to, described sleeve pipe is at the original depth of this location product of the efficiency factor of the cross section of part and joint usually that forms first tubular member in its end more than or equal to pipe

It is projection and recessed that the conical surface of the-the second and the 3rd stop surface can be respectively, so that first internal surface forms the first radially tight seal contact on second outer surface.In this case, originally first and second lips can have selected shape, so that before second stop surface is bearing on the 3rd stop surface, first stop surface is bearing on the 4th stop surface,

-in other embodiments, the conical surface of the second and the 3rd stop surface can be respectively recessed and projection, so that first outer surface forms the first radially tight seal contact on the 3rd internal surface.In this case, the 3rd internal surface of second tubular member originally can be in the joint of itself and the 4th stop surface, has a primary sealing area, it has the selected inclination of an angle with respect to longitudinal direction generally, first tubular member originally can be in its first outer surface, joint at itself and first stop surface, has a secondary sealing area, it has the selected inclination of an angle with respect to longitudinal direction generally, so that when tightening, radial compaction of first and second sealing surfaces forms the contact of the 3rd tight seal on another.Therefore, first and second sealing surfaces can be arranged to, and the contact of first tight seal is formed at after the contact of the 3rd tight seal betwixt, so that strengthen the latter,

Originally the selected angle of-the first and second sealing surfaces can be approximately+1 ° of extremely about+30 ° (for one of two sealing surfaces, also can set a zero degree),

At least one can be a conical surface or a convex surface (having an annular portion alternatively) in-the first and second sealing surfaces,

-primary sealing area can be limited by one the 3rd a part annular recess towards the inside of the 3rd internal surface,

-secondary sealing area can be limited by one the 4th a part annular recess towards the inside of first outer surface.

The invention still further relates to from the implementation methods of a tube-shaped joint of a distensible tube T-joint of the above-mentioned type expansion.

This method is from aforementioned distensible tube T-joint, then, (i) tighten first and second tubular member, be received in the annular cavity until first lip, be bearing on the 3rd stop surface until second stop surface, so that one of first inner and outer surface of first lip respectively hermetically radial compaction on second outer surface or the 3rd internal surface, form the first radially tight seal contact, and (ii) by means of an axial motion type expanding tool, make the distensible tube T-joint carry out expanded in diameter in the plastic deformation scope, first outer surface and the 3rd internal surface are local determines that second tight seal contacts to force.

In the method, can be since first and second lips, originally described lip has selected shape so that first closely contact establish between first internal surface and second outer surface, and make the first closely only formation second stop surface is bearing on the 3rd stop surface after of contact.

In addition, when the conical surface of the second and the 3rd stop surface is respectively projection and recessed, tightens and at first to force first stop surface to be bearing on the 4th stop surface, so that first lip carries out axial compression in regime of elastic deformation.

In other embodiments, when the conical surface of the second and the 3rd stop surface be respectively recessed and projection the time, tighten and to force radial compaction of first and second sealing surfaces on another, at first form the contact of the 3rd tight seal, then, form the contact of first tight seal, it strengthens the contact of the 3rd tight seal.In addition, expansion can form the contact of the 4th tight seal between the free end of first internal surface and second outer surface.

Although be without limitation, this method is particularly suitable for joint and carries out radial dilatation according to the spreading rate that equals 10% at least.

Description of drawings

With reference to accompanying drawing and following detailed description, other features of the present invention and superiority will be better understood, and accompanying drawing is as follows:

Fig. 1 is an embodiment's of the expansible inipple of the present invention longitudinal sectional drawing of a part;

Fig. 2 be taper female threads and corresponding taper male threads a part tighten and expand before the longitudinal profile schematic representation;

Fig. 3 is the longitudinal profile schematic representation of a part of protruding positive formula end of first pipe of expansible inipple shown in Figure 1;

Fig. 4 is the longitudinal profile schematic representation of a part of recessed cloudy formula end of second pipe of expansible inipple shown in Figure 1;

Fig. 5 is the longitudinal profile schematic representation of the active force that produces on the protruding positive formula of the pipe shown in Fig. 3 and 4 and recessed cloudy formula end in first stage of tightening;

Fig. 6 is the longitudinal profile schematic representation of the active force that produces on the protruding positive formula of the pipe shown in Fig. 3 and 4 and recessed cloudy formula end in second stage of tightening;

Fig. 7 is the longitudinal profile schematic representation of the active force that produces on the protruding positive formula of the pipe shown in Fig. 3 and 4 and recessed cloudy formula end in the plastic deformation expansionary phase;

Fig. 8 is the protruding positive formula of the pipe shown in Fig. 3 and 4 and the longitudinal profile schematic representation of the distortion that recessed cloudy formula end was stood after the expansionary phase;

Fig. 9 is an embodiment the longitudinal profile schematic representation of a part of a builtup member of two expansible inipples of symmetric arrangement of the present invention;

Figure 10 is another embodiment's the longitudinal profile schematic representation of a part of protruding positive formula end of one first pipe of expansible inipple of the present invention;

Figure 11 is another embodiment's the longitudinal profile schematic representation of a part of recessed cloudy formula end of one second pipe of expansible inipple of the present invention; And

Figure 12 is the longitudinal profile schematic representation of protruding positive formula and the recessed cloudy formula end relative position after the stage of tightening of the pipe shown in Figure 10 and 11.

Embodiment

Accompanying drawing not only can be used for the supplementary copy invention, and helps to point out its feature in case of necessity.

The present invention relates to especially can be used for hydrocarbon well or similar for example the threaded tubular SEALING FITTING of geothermal well and relevant implementation methods of well.

As described in preamble, threaded tubular joint of the present invention can be by the assembling each other or big pipe and the assembling of sleeve pipe, formation encasement tube tubing string or the production pipe tubing string of length of the big metal tube of length.

At first, referring to figs. 1 through 8, one first embodiment of joint of the present invention is described.In this embodiment, shown in Fig. 1 part, joint can connect and has rotational axis XX, that length is big, i.e. several meters long two pipe T1 and T2, exactly, the recessed cloudy formula end EF (or female tubular element) that the protruding positive formula end EM (or male tubular element) and one second that connects one first pipe T1 manages T2 in the embodiment shown, pipe T1 and T2 for example have a common part, and its original outer diameter equals about 193.68mm (or 7 " 5/8).The common part of one pipe is away from the middle body of its two end part, diameter substantial constant.

As shown in Figure 1, the protruding positive formula end EM of a pipe T1 has two-part P1 and P2.The middle body of the P1 of first portion extension tube T1 is furnished with outer external screw thread FM, its preferably taper, but also can be cylindricality.

For example, as shown in Figure 2, set tapered thread, its conicity Δ D/D is 10%, and wherein, D is a diameter.In addition, originally big must being enough to of the axial clearance between the screw thread (or axial clearance) provides certain one-movement-freedom-degree when carrying out expanded in diameter, will be described below.For example, the axial clearance between the FS of the engagement limit of the screw thread of external screw thread FM and female thread FF (or " piercing through (stabbing) limit ") is extremely about 0.3mm of about 0.05mm, is preferably about 0.05mm to about 0.25mm.

In addition, for guaranteeing especially compression performance of good tensile property, thereby before the expansion, in the danger that is reducing external screw thread and female thread disengagement between expansionary phase and after expansion or grinding, the carrying limit of screw thread (or " load (loading) limit ") FL for example with respect to inclined one pact-3 ° to approximately-15 °, preferably equal-10 ° negative angle α 1 approximately, and the engagement limit FS of screw thread for example with respect to inclined one pact+10 ° to approximately+30 °, preferably equal+15 ° positive angle α 2 approximately.

Negative angle α 1 can avoid the screw thread disengagement of meshing or grind, and it is especially true down to stretch.In addition, positive angle α 2 is big more, the engagement of screw thread is easy more, still, resistance against compression reduces more.

Be important to note that external screw thread FM and female thread FF can form at least a portion tubular member EM, EF.In other words, they are embodied as one or more parts.When they were made of two-part, two surfaces that they alternatively can be different were diametrically gone up and are formed, and perhaps form on same surface.

Second portion P2 extends the P1 of first portion in the end of pipe T1.At first, as shown in Figure 3, it has one first annular lip (or annular refers to bar) L1, and it comprises: originally one first axial stop face SB1 is flat basically, and perpendicular to the longitudinal direction A (being parallel to XX) that manages T1; Originally one first internal surface SI1 substantially perpendicularly extends the first axial stop face SB1 along the direction of the P1 of first portion, and towards pipe T1 interior orientation (promptly relative side of the external screw thread FM); And the part of one first outer surface SE1, also extend the first axial stop face SB1 along the direction of the P1 of first portion, and directed outside pipe T1.The first outer surface SE1 of the second portion P2 of protruding positive formula element EM extends to external screw thread FM from the first stop surface SB1.Second portion P2 also has one second stop surface SB2, and it extends the first internal surface SI1, and is extended by one (the 4th) internal surface SI4, and the latter is cylindricality at least partly, be used for and the pipe T1 circuit fluid (or gas) contact.The first axial stop face SB1, the first internal surface SI1 and the second stop surface SB2 limit one alleged " protruding positive formula chamfered groove " of existent technique personnel.

As shown in Figure 3, in view of a following reason, the first internal surface SI1 selected angle [alpha] 3 that can tilt with respect to the longitudinal direction A of pipe T1.Therefore, originally it form a conical surface.Preferably about 0.1 ° to about 15 ° of inclination angle preferably equals about 2.5 °.In addition, as shown in the figure, the first outer surface SE1 can omit microprotrusion, and exactly, ringwise, its long radius for example is 20mm to 100mm, so that inwardly press at a groove G1, sees below.

As shown in Figure 4, the recessed cloudy formula end EF of a pipe T2 also has two-part P3 and P4.The P3 of first portion that is arranged in the end of pipe T2 as far as possible is furnished with the corresponding interior female thread FF with external screw thread FM.

Second portion P4 extends the P3 of first portion towards the middle body of pipe T2.At first, it has one second annular lip (or annular refers to bar) L2, and it comprises: one the 3rd stop surface SB3; One second outer surface SE2, directed outside pipe T2, extend the 3rd stop surface SB3 along the direction relative, and be used for arranging with respect to the first internal surface SI1 with the P3 of first portion; And one second internal surface SI2.At least partly be cylindricality,, and also extend the 3rd stop surface SB3 along the direction relative with the P3 of first portion towards pipe T2 interior orientation.

It also has a four-axial stop surface SB4 and one the 3rd internal surface SI3, and originally described four-axial stop surface SB4 is flat basically, and perpendicular to the longitudinal direction A that manages T2.Described the 3rd internal surface SI3 is cylindricality partly, towards pipe T2 interior orientation, and extends four-axial stop surface SB4 along the direction of the P3 of first portion.The part of the 3rd internal surface SI3 limits annular cavity (or groove) LO of the correspondence of the first lip L1 together with the second outer surface SE2 and the 4th stop surface SB4, so that admit the described first lip L1 in the stage of tightening of pipe T1 and T2, will be described below.

Chamber LO is on the selected axial length PR that the axial length with the second lip L2 equates, extend along a selected radial depth H (perpendicular to longitudinal direction A).Preferably, ratio PR/H is about 1 to about 3, is preferably about 1.2 to about 1.6.Preferably, it equals about 1.5.For example, PR equals 4mm and H equals 2.7mm, and like this, ratio PR/H is substantially equal to 1.5.As mentioned below, this two sizes PR and H are chosen to distortion that the first lip L1 and root area thereof are selected.

The 3rd stop surface SB3, the second outer surface SE2 and four-axial stop surface SB4 limit one alleged " recessed cloudy formula groove " of existent technique personnel.

In addition, an annular groove G1 is limited at least a portion of each the 3rd internal surface SI3.Preferably, originally it have and be middle body PC cylindricality, that extended by two curved portion PC1 and PC2 in both sides basically.Preferably, these curved portion C1 and C2 radius of curvature originally is substantially the same, and preferably about 2mm is to about 20mm.But this groove G1 can only have two curved portion.

For example, groove G1 has a middle body PC and curved portion C1 and C2, and described middle body PC is equaling the axial length PR ' of about 2mm, equaling to extend on the radial depth H ' of about 1mm, and the radius of curvature of described curved portion C1 and C2 equals about 5mm.The radial depth H ' of groove G1 is generally limited by the thickness of pipe T2 at the symmetry plane PSG place of described groove, and it should be less than the minimum thickness that is used to calculate the inipple critical section.Exactly, the maximum value of radial depth H ' is selected to, the material normal section of the bottom of groove G1 is greater than managing T1 or the T2 cross section (if perhaps they are different, then being minimum in this two sections) in its common part and the product of the stretching efficiency factor of joint.Ratio between the cross section of the critical section of threaded piece and pipe (T1, T2) constitutes the feature of the efficient of link (or joint), and its cross section with pipe is input data of design one tubular tubing string.

In this configuration, the four-axial stop surface SB4 of the bottom of the symmetry plane PSG of each groove G1 and qualification corresponding chamber (or groove) LO is at a distance of a selected axial distance D.For example, adopt aforementioned numerical value, distance D equals about 5.61mm.In addition, after tightening, the middle body PC of groove G1 is substantially perpendicular to thickness surplus SA1.

As mentioned below, radius of curvature (especially screw thread one side), radial depth H ', axial length PR and radial depth H are chosen to the distortion that makes the first lip L1 and select in the second portion P2 zone of its root.

Second portion P4 also has another (the 5th) cylindrical internal surface SI5, and it extends the second stop surface SB2 along the direction relative with the P3 of first portion (promptly along pipe T2 the direction of middle body), and is used for and contacts managing T2 circuit fluid (or gas).

According to the present invention, originally the second stop surface SB2 and the 3rd stop surface SB3 have the conical surface, and it has substantially the same selected angle with respect to a plane perpendicular to longitudinal direction A is the inclination of α 4.In this first mode of execution, it is projection and recessed that the conical surface of the second stop surface SB2 and the 3rd stop surface SB3 is respectively.

Preferably, shown in Fig. 3 and 4, the second stop surface SB2 has identical initial tilt degree basically with the 3rd stop surface SB3.So-called " inclination of Xiang Denging basically " is meant the inclination of being about of being equal to each other ± 5 ° here.Preferably, this public inclination is the angle [alpha] 4 of the angle [alpha] 4 of+5 ° of pacts to+30 ° of pacts.Preferably, it equals about 10 °.

When the stage of tightening second stop surface SB2 is bearing on the 3rd stop surface SB3, this inclination can make the first lip L1 carry out radially prestressing along the axial direction of joint, therefore the second outer surface SE2 that is pressed on the second lip L2 goes up (because its selected shape separately) with making its first internal surface SI1 radial seal, thereby determines the tight seal contact of radial component.

The formation use of expanding duct T-joint of the present invention has the method in following stages and carries out.

In the phase I shown in Fig. 5, the for example protruding positive formula end EM in end that one of pipe is for example managed T1 is tightened in another pipe and for example manages on for example recessed cloudy formula end EF in end of T2, is bearing on the four-axial stop surface SB4 of chamber (or groove) LO until the first axial stop face SB1 of the first lip L1.

For the ease of carrying out this tightening, as shown in Figure 4, the second outer surface SE2 of the second lip L2 can with respect to longitudinal direction A, have the inclination that selected angle is α 5 in the joint of itself and the 3rd stop surface SB3 in a short distance.Therefore, originally it form a conical surface inclined-plane.Preferably, this inclination is originally for making an appointment with+8 ° angle extremely to make an appointment with+12 ° angle.Preferably, it equals about 10 °.Especially under the situation that accident is disturbed, this inclination is convenient to the first lip L1 and is entered chamber (or groove) LO, thereby reduces the especially end rib of its first internal surface SI1 possible danger blocking or damage of the first lip L1.In fact, be bearing in the 3rd stop surface SB3 before at the second stop surface SB2, this interference can occur between the first internal surface SI1 and the second outer surface SE2.

Then,, proceed to tighten, be bearing in until the second stop surface SB2 of the first lip L1 on the 3rd stop surface SB3 of the second lip L1 in second stage.After the first stop surface SB1 is bearing on the 4th stop surface SB4, continues to tighten and when making the first lip L1 carry out axial compression, elastic potential energy to be stored among the described first lip L1.

In the phase III shown in Fig. 6, also continue to tighten, so that inclination (or gradient) by means of the second stop surface SB2 and the 3rd stop surface SB3 of the first lip L1 and the second lip L2, by means of the cooperation of the first axial stop face SB1 and four-axial stop surface SB4, make the axial direction diametrically prestressing of the first lip L1 along joint.This prestressing force indicates with arrow F1 and F2 on Fig. 6.

Therefore, the contact between different stop surfaces and two lips is obviously strengthened, thereby guarantees the sealing of joint before the stage in expanded in diameter.Therefore, the expansion before, exist tractive force or axial compressive force in depress, obtain splendid anti-fluid sealability.

In the quadravalence section, in one of pipe T1 and T2, axially insert a diameter expanding tool, a ball with conical nose for example, its maximum diameter be greater than the initial inside diameter DI of pipe T1 and T2 (equal inside radius RI shown in Figure 12 times), and be substantially equal to its final internal diameter.The selection of direction of insertion does not have actual importance.Therefore, ball can move axially towards a recessed cloudy formula end EF from a protruding positive formula end EM, and vice versa.

(especially referring to document US 6,604,763 and WO 03/071086) carried out in moving in the known mode of prior art personnel of ball, for example by means of drilling rod or apply hydraulic pressure and draw.Ball for example is an awl cylindrical shape, has the conical entering part of being responsible for expanding and partly being extended by a central, cylindrical.But its shape also can be (conical entering part is extended by a cylindrical section, and described cylindrical section itself is partly extended by a flaring exit) sphere or double cone shape, and the connection radius of this of ball three parts is selected as required.

Other expansion tools can be used for replacing ball, for example have three rotary type expanding tools that carry out the cylinder of mechanical expansion.This expansion tool (comprising ball) and usage mode thereof are especially of document WO 02/081863, US 6,457,532 and US 2002/0139540.

Expanded in diameter is carried out in the plastic deformation scope.Because the plastic deformation that produces increases the limit of elasticity of tubular member, therefore, must use the metal of supporting this distortion.For example, a pipe that originally has 310MPa (45KSI) limit of elasticity can make this limit reach 380MPa (55KSI) after expansion.

When ball arrived the 5th internal surface SI5 place of second portion P4 of the 4th internal surface SI4 of second portion P2 of protruding positive formula end EM and recessed cloudy formula end EF, the material of expansion forced the first lip L1 to be out of shape in groove G1.Joint indicates with arrow F3 to F6 on Fig. 7 in the distortion that stands between expansionary phase.

Exactly, the first lip L1 is forced to bending (arrow F4), and has the shape of groove G1 at least partly.Therefore, as shown in Figure 8, distortion before the first lip L1, produces a shoulder or annular protrusion EP at the first outer surface SE1 place of protruding positive formula end EM, and it can form a sealing area by the tight contact of " metal to metal " formula.

Because at the 4th internal surface SI4 place, near the second stop surface SB2, set a part annular thickness surplus SA1 towards the direction of the inside of managing T1, therefore, shoulder EP and tightness can be strengthened.Preferably, shown in Fig. 3 and 5 to 7, this thickness surplus SA1 is constant in the elongated area of the middle body PC of groove G1 basically, reduces then.It is this that to reduce preferably towards the direction of the P1 of first portion be continuous basically.For example, it can form an angle [alpha] 9 with respect to longitudinal direction A, and it is about 5 ° to about 30 °, preferred about 10 ° to about 20 °, preferably equals about 12 °.

The maximum ga(u)ge surplus of constant thickness location limits the minimum diameter of protruding positive formula element EM.This internal diameter must be greater than the buffer diameter of (prior art personnel are called " punch (drift) ").Buffer (or punch) is an instrument that is inserted into before in the well under pipe in the described pipe, has minimum free internal diameter to guarantee described pipe, and the instrument of assurance enters tubing string and do not have the danger of hooking.Therefore, when it during less than above-mentioned value, the needed quantity of material in bottom that the optimum value of thickness surplus makes the first lip L1 be installed in groove G1 to greatest extent during by expansion is fixed, and is out of shape as required making it.For example, this thickness surplus equals about 0.8mm.

This thickness surplus SA1 provide surplus material, can fill up the empty space of groove G1, therefore can make the first lip L1 and be positioned at its zone before to have the configuration of the described groove G1 of at least a portion, thereby have described distortion basically.

As mentioned above, distortion before the first lip L1, produces an annular shoulder or protruding EP at the first outer surface SE1 place of protruding positive formula end EM, and it can form a sealing area by the tight contact of following manner.

Expand with ball, because the diameter of recessed cloudy formula part EF is greater than the diameter of protruding positive formula element EM, therefore, the spreading rate of protruding positive formula element EM is greater than the spreading rate of recessed cloudy formula part EF.

Therefore, because the maintenance of material, the contour projector of protruding positive formula element EM is greater than the contour projector of recessed cloudy formula part EF, this show as this two member in Fig. 7 arrow F5 and the disengaging direction shown in the F6 axially relatively move.This moving is pressed on another brute force of inclination shoulder EP, forms desired sealing.It may be noted that contact pressure or impacting force are also strengthened when the joint of expansion imposes axial thrust force.

Because the axial disengaging during expansion, the axial length of the first lip L1 and the second lip L2 must accurately be selected.In fact, if the first lip L1 is too short, just have from its chamber LO deviate from, towards the danger of the axis tilt of joint, thereby after expansion, lose sealing.If the second lip L2 is oversize, then chamber LO is difficult to processing.

Have benefited from the curvature of the first lip L1 of the shape of groove G1 and thickness surplus SA1 during expansion, show as the interior section of end of the first lip L1 and the second closely contact between the second outer surface SE2.

Therefore, first lip L1 brute force supports and is fixed between the shoulder that constitutes on the wall of groove G1 and the second outer surface SE2.For possible different load modes, comprise the interior pressure and the external pressure that combine or do not combine with tractive force or axial compressive force, this dual contact can be guaranteed stable splendid sealing.

For the ease of the contact between first lip L1 bending and reinforcement shoulder or protruding EP and the groove G1, shown in Fig. 3 and 5 to 7, can before the P1 of first portion, set a recess DC1 towards pipe T1 inside at the first outer surface SE1 place.This recess DC1 preferably is continuous basically.Therefore, originally it constitute a tapered slope.For example, it about 8 ° to about 12 °, preferably equals about 10 ° with respect to longitudinal direction A α 6 at angle.For example, this recess DC1 starts from equaling with the first axial stop face SB1 (A along the longitudinal direction) distance of about 7.8mm apart.

In addition, in order to arrange required material, pipe T1 can be at P1 of its first portion and second portion P2 place, and in protruding positive formula element EM first being processed, carrying out semiapex angle is the taper undergauge of α 7, and when pointing to the free end of protruding positive formula element EM, the diameter of cone reduces continuously.

This undergauge can increase material thickness at second portion P2 place, hold thickness surplus SA1 after protruding positive formula element EM processing, especially thickness surplus SA1 processing, the undergauge track shows as when pointing to the free end of protruding positive formula element EM towards the inner part annular recess DC2 of pipe.

In order not influence the propelling of ball in pipe T1, undergauge preferably is continuous basically.Angle [alpha] 7 is about 2 ° to about 20 °, preferably equals about 5 °.

When the first internal surface SI1 of the first lip L1 has an inclination when (for example being about 2.5 °), this can make the disposed outside of the more close pipe T2 of the second lip L2.Therefore, when ball arrived the second lip L2 place, it can be near the outside of pipe T2.In addition, can limit " banana " effect like this, it trends towards making the second lip L2 extremely to tilt towards the inside of the cavity of pipe T2.

Because at the second internal surface SI2 place of each second lip L2, near the 3rd stop surface SB3, the internal direction towards pipe T2 sets a part annular thickness surplus SA2, therefore, described close can be more strong.Preferably, shown in Fig. 4 to 7, this thickness surplus SA2 is constant in the elongated area of the second lip L2 basically, reduces then.This reducing is continuous basically preferably.Therefore, originally it constitute a tapered slope.For example, it can form an angle [alpha] 8 with respect to longitudinal direction A, and it is about 8 ° to about 12 °, preferably equals about 10 °.

This thickness surplus SA2 preferably depends on thickness surplus SA1, preferably less than described thickness surplus SA1.In any case, its maximum value of limiting less than diameter by buffer (or " punch ").For example, this thickness surplus SA2 is about 0.3mm to 0.8mm, preferably equals about 0.5mm.The initial deviation that different thickness surplus SA1 and SA2 provide is convenient to the especially final distortion of the first lip L1.But this deviation should be too not big, because it may eliminate the aforementioned effect that the inclination (when it exists) of the first internal surface SI1 of the first lip L1 provides.

As mentioned above, the expansion result who passes through to produce of ball as shown in Figure 8.Be important to note that in the bushing type jointing (being not in whole joints), because expansion produces axially disengaging, therefore, the distortion of the first lip L1 and the second lip L2 can be incomplete same at the relative two end part of sleeve pipe.But this difference (or asymmetry) is than littler in the bushing type jointing described in the document FR 02/03842.

Importantly it is also noted that the elastic return of member after ball passes through of each inipple of builtup member, before the generation plastic deformation, can ignore.

One embodiment of one builtup member of two joints of symmetric arrangement of the present invention is described with reference to Fig. 9 now.In this embodiment, two joints can connect the pipe T1 and the T2 of two length by an adapter sleeve M formula tubular member.This sleeve pipe M is here with respect to being symmetric shape with the perpendicular symmetrical plane P SM of the longitudinal direction A of pipe T1 and T2.In addition, it is recessed the moon/recessed cloudy formula.

This sleeve pipe M have one in both sides by the middle body PCM of two P3 ' of first portion and two second portion P4 ' extension, the first portion (P3) of the recessed cloudy formula end EF of they and aforementioned tube T2 and second portion (P4) are same types.Therefore, the first portion (P3) of the recessed cloudy formula end of pipe (T2) and the P3 ' of first portion that second portion (P4) also is applicable to sleeve pipe M and second portion P4 '.

As shown in the figure, the middle body PCM of sleeve pipe M preferably has an annular groove G2 (being also referred to as " crescent part "), and it limits a thickness surplus that centers on symmetry plane PSM partly.

This crescent part G2 can reduce the thickness of sleeve pipe M in its thickest part, thereby reduces pressure and dilating effect power.In addition, it can control the distortion of the different parts of stop surface (SB1 to SB4) and supporting portion preferably, makes the joint builtup member have straight basically outward appearance (turning surface outside) after expansion.Therefore, the thickness of sleeve pipe M at its symmetry plane PSM place should be chosen to be formed at more than or equal to first tubular member product of the efficiency factor of the cross section of part and joint usually of the pipe T1 of its end and T2.

Preferably, crescent part extends between two the 3rd axial stop face SB3 of two second relative lip L2 basically.But it can be between the last screw thread that especially extends in two recessed cloudy formula screw thread FF on the bigger distance.Last screw thread is the screw thread that is positioned at the 3rd stop surface SB3 one side here.

In addition, this crescent part G2 can be basin shape, is furnished with a middle body and the angle of inclination with maximum ga(u)ge (at symmetry plane PSM place) in shortage and preferably preferably equals about 15 ° sloped sidewall less than about 30 °.

Be important to note that crescent part (thereby groove G2) is not forcibly symmetrical with respect to plane P SG.In fact, it can have two asymmetric parts in the both sides of plane P SG.

Now, with reference to Figure 10 to 12, another embodiment of distensible tube T-joint of the present invention is described.

This embodiment with have many similaritys referring to figs. 1 through 8 described embodiments.Therefore, its common member has identical label.In addition, shape member substantially the same, that guarantee substantially the same effect is no longer described.

In addition, this embodiment is as previous embodiment, not only relate to the protruding positive formula end EM (or male tubular element) and that makes length one first pipe T1 big, that have rotational axis XX and also be that length is big, the joint that is connected of recessed cloudy formula end EF (or female tubular element) of the second pipe T2 with rotational axis XX, but also relate to symmetric arrangement, as above shown in Figure 9, assembling that two joints that can connect big pipe T1 of two length and T2 pass through an adapter sleeve M formula tubular member.

The main distinction of this and previous embodiment is the implementation detail of the second stop surface SB2 and the 3rd stop surface SB3, and be the first outer surface SE1 of the first tubular member EM and the second tubular member EF and the implementation detail of the 3rd internal surface SI3 alternatively, the expansion before, its can carry out first with the 3rd the sealing (or closely contacting).

Originally the second stop surface SB2 and the 3rd stop surface SB3 have the conical surface all the time, and it has substantially the same selected angle with respect to a plane perpendicular to longitudinal direction A is the inclination of α 4.But in this second embodiment, the conical surface of the second stop surface SB2 and the 3rd stop surface SB3 is respectively recessed and projection.

Angle is that the inclination of α 4 is chosen to the second stop surface SB2 and is bearing on the 3rd stop surface SB3, makes the first outer surface SE1 (the first lip L1's) carry out the first radially tight seal contact on the 3rd internal surface SI3.

Preferably, shown in Figure 10 to 12, the second stop surface SB2 has identical initial tilt degree basically with the 3rd stop surface SB3.Preferably, this public inclination is the angle [alpha] 4 of the angle [alpha] 4 of+5 ° of pacts to+30 ° of pacts.Preferably, it equals about 10 °.

When the stage of tightening second stop surface SB2 was bearing on the 3rd stop surface SB3, the first lip L1 pointed to the outside of link forcibly.Can make the first lip L1 prestressing so diametrically, thereby strengthen its contacting at chamber LO place and the second tubular member EF.

In addition, be preferably, the 3rd internal surface SI3 of the second tubular member EF comprises a part of DC3, it is arranged between the second curved portion C2 of the joint of itself and the 4th stop surface SB4 and groove G1, wherein originally determine a primary sealing area, to have a selected angle be the inclination of α 10 with respect to being horizontal plane with longitudinal direction A generally for it.

This primary sealing area DC3 is limited by the 3rd a part annular recess towards the inside of the 3rd internal surface SI3 alternatively.It can be the shape of a conical surface or a convex surface, has an annular portion alternatively.

Originally the inclination alpha 10 of primary sealing area (alternatively, the 3rd part annular recess) DC3 be preferably approximately+and 1 ° to+30 ° approximately, preferably equals about 10 °.

In addition, the first outer surface SE1 of the first tubular member EM has a stub area, it is positioned at its position that is connected with the first stop surface SB1 (therefore being positioned at the position of the first lip L1), wherein, originally limit a secondary sealing area, to have a selected angle be the inclination of α 11 with respect to being horizontal plane with longitudinal direction A generally for it.

This secondary sealing area is limited by the 4th a part annular recess towards the inside of the first internal surface SE1 alternatively.It can be the shape of a conical surface or a convex surface, has an annular portion alternatively.

This secondary sealing area DC4 is used for being fastened on diametrically in the stage of tightening the primary sealing area DC3 of the second tubular member EF.

Originally the inclination alpha 11 of secondary sealing area (alternatively, the 4th part annular recess) DC4 be preferably approximately+and 1 ° to+30 ° approximately, preferably equals about 10 °.

Inclination alpha 10 is preferably identical with α 11.But this not necessarily.In fact, for example can be adapted to, one of primary sealing area DC3 and secondary sealing area DC4 are tapered or protruding, have a non-zero inclination, and another sealing surface for example are cylindricality, has zero inclination.

Primary sealing area DC3 and secondary sealing area DC4 are limited by the third and fourth part annular recess alternatively, be arranged to respectively the stage of tightening can be diametrically one be pressed on another, form the contact of the 3rd tight seal.

In addition, primary sealing area DC3 and secondary sealing area DC4 can be arranged to, and the contact of first tight seal forms after the contact of the 3rd tight seal.In fact, this can strengthen the contact of first tight seal.

In other words, in the stage of tightening, preferably, the first lip L1 at first contacts with secondary sealing area DC4 by primary sealing area DC3, and then, the second stop surface SB2 is bearing on the 3rd stop surface SB3.

In this embodiment, the middle body PC of annular groove G1 is for example equaling the axial length PR ' of about 2.2mm, is equaling to extend on the radial depth H ' of about 1mm, and the radius of curvature of described curved portion G1 and C2 for example equals about 5.3mm.In addition, the symmetry plane PSG of groove G1 for example equals about 5.7mm with the four-axial stop surface SB4 axial distance D apart of the bottom that limits chamber (or groove) LO.

Chamber LO is on the selected axial length PR that the axial length with the second lip L2 equates, extend along a selected radial depth H (perpendicular to longitudinal direction A).Ratio PR/H preferably is always about 1 to about 3, still, is preferably about 1.4 to 1.9 from now on, preferably equals about 1.7.For example, PR equals 4.2mm and H equals 2.4mm, and like this, ratio PR/H equals 1.7.

In addition, as previous embodiment, the second outer surface SE2 of the second lip L2 can with respect to longitudinal direction A, have the inclination that selected angle is α 5 in the joint of itself and the 3rd stop surface SB3 in a short distance.Therefore, originally described inclination forms a conical surface inclined-plane, and originally its inclination for making an appointment with+8 ° angle extremely to make an appointment with+12 ° angle, preferably equals about 10 °.As previously mentioned, this is convenient to the first lip L1 and enters among chamber (or groove) LO, and is especially true under the situation about disturbing that meets accident.

In addition, as previous embodiment, the angle [alpha] 3 that the first internal surface SI1 of the first lip L1 preferably selectes with respect to the longitudinal direction A inclination one of pipe T1.Therefore, originally it form a conical surface.The inclination angle preferably is always about 0.1 ° to about 15 °, preferably equals about 2.5 °.As previously mentioned, this inclination can ball by the time make the second lip L2 near the pipe T2 the outside, thereby the restriction banana effect.

In addition, as previous embodiment, crooked and strengthen contact between shoulder or protruding EP and the groove G1 for the ease of the first lip L1, the first outer surface SE1 can before the P1 of first portion, have one towards pipe T1 inside, preferably be the first continuous recess DC1 basically.Originally this first recess DC1 constitutes the tapered slope that an angle is α 6 with respect to longitudinal direction A, and about 8 ° to 12 ° of described angle preferably equals about 10 °.For example, this recess DC1 starts from equaling with the first axial stop face SB1 (A along the longitudinal direction) distance of about 8.1mm apart.

As previous embodiment, the 4th internal surface SI4 can the direction along the inside of managing T1 have a part annular thickness surplus SA1 near the second stop surface SB2.Preferably, shown in Figure 10 and 12, this thickness surplus SA1 is constant in the elongated area of the middle body PC of groove G1 basically, and the preferred then direction along the P1 of first portion reduces basically continuously.For example, it can form an angle [alpha] 9 with respect to longitudinal direction A, and it is about 5 ° to about 30 °, preferred about 10 ° to about 20 °, preferably equals about 12 °.

Equally, as previous embodiment, the 5th internal surface SI5 of the second lip L2 can the direction along the inside of managing T2 have a part annular thickness surplus SA2 preferably near the 3rd stop surface SB3, shown in Figure 11 and 12, this thickness surplus SA2 is constant in the elongated area of the second lip L2 basically, preferably reduces continuously basically then.Therefore, originally it constitute a tapered slope.For example, it can form an angle [alpha] 8 with respect to longitudinal direction A, and it is about 8 ° to about 12 °, preferably equals about 10 °.This thickness surplus SA2 preferably depends on thickness surplus SA1, preferably less than described thickness surplus SA1.For example, this thickness surplus SA2 is about 0.3mm to 0.8mm.Preferably equal about 0.5mm.

Identical with the described joint of reference Fig. 5 to 8 basically from the formation of the above joint of expanding with reference to the expansible joint of the described type of Figure 10 to 12.

In the phase I, for example protruding positive formula end EM in end that one of pipe is for example managed T1 for example is tightened in another pipe and for example manages on for example recessed cloudy formula end EF in end of T2, contacts with primary sealing area DC3 until secondary sealing area DC4, forms the 3rd tight seal and contacts.

In second stage, continue to tighten, be bearing in until the second stop surface SB2 on the 3rd stop surface SB3 of the second lip L2, form the first radially tight seal contact of the first outer surface SE1 on the 3rd internal surface SI3.

In the phase III, continue to tighten, so that inclination (or gradient) by means of the second stop surface SB2 and the 3rd stop surface SB3 of the first lip L1 and the second lip L2, and by means of inclination (or gradient) described chamber LO and the primary sealing area DC3 first lip L1 and secondary sealing area DC4, make the first lip L1 prestressing diametrically, until specific moment.

The same being strengthened in contact between the inner and outer surface of lip L1 and chamber LO and the previous embodiment, thus guaranteed the bigger sealing of joint before the stage in expanded in diameter.

Therefore, the expansion before, exist tractive force or axial compressive force in depress, obtain splendid anti-fluid sealability.

The quadravalence section is identical with aforementioned stages, in the quadravalence section, with a diameter expansion tool for example a ball journal with conical nose in being inserted into one of pipe T1 and T2, in the plastic deformation scope, make joint carry out expanded in diameter.

In the final stage of expansion, the 4th tight seal contact is determined between the second outer surface SE2 of the free end (at the position of its first internal surface SI1) at the first lip L1 and the second lip L2.Therefore, the first lip L1 closely contacts owing to the 4th and is fixed by its free end, and fixed by " projection " of extending it at the first outer surface SE1 place owing to second tight the contact.

When the first tubular member EM had a primary sealing area DC3, when the second tubular member EF had a secondary sealing area DC4, in case the quadravalence section stops, upstream one side of a joint builtup member and the sealability deviation between one side of downstream reduced basically alternatively.This is the result that upstream one side contacts pressure increases, and does not damage the contact pressure of downstream one side.

By means of the present invention, obtainable joint before that have a high spreading rate even the very high expansionary phase that is generally 10% to 35% spreading rate and afterwards has good even excellent air tightness to inside and outside pressurized gas.Obviously, the present invention also is applicable to and is lower than 10% spreading rate.

In addition, therefore the distortion " asymmetric " when the present invention can make expansion within bounds under the situation of bushing type assembling can obtain the excellent sealing of the expansion inipple that each side at the middle body of sleeve pipe forms.

In addition, the present invention can use large-scale steel and alloy, as long as material has the malleability that is enough to expand.If steel, then material can be non-alloyed steel, or manganese steel, or the chromium-molybdenum alloy steel, or micro alloyed steel, or boron steel, or the compound of aforementioned composition (chromium-molybdenum-niobium-boron alloyed steel), or contain the steel of 13% martensitic chromium, or contain two austenitic iron oxysome steel of 22% or 25% chromium, or Austenitic Stainless Steel.For example, the carbon/manganese alloyed steel can be used for the non-aggressive well, and the steel (X20 chromium 13-names according to European norm, and AISI (AISI) 420-names according to the U.S.) that perhaps contains the chromium of 0.2% carbon and 13% can be used for carbonated corrosivity well.

In addition, material is heat-treated alternatively, so that have greater than a selective value or in the limit of elasticity of the number range of selecting.The minimal elastic limit for example can be selected at 300MPa to 1000MPa even bigger scope.

The present invention is not limited to the assembling method and the mode of execution of above-mentioned threaded tubular SEALING FITTING as just example, and comprises the every other embodiment that the prior art personnel are implemented in the scope of claims below.

Claims (44)

1. distensible tube-shaped joint, described tube-shaped joint comprises one first tubular member (EM) on the one hand, this first tubular member (EM) has a first portion (P1) and that is furnished with external screw thread (FM) and extends the second portion (P2) of described first portion, and described second portion (P2) comprising:

(i) one first outer surface (SE1),

(ii) one first annular lip (L1), it has one first axial stop face (SB1) and one first internal surface (SI1), and is limited by described first outer surface (SE1) on a part of axial length of described first outer surface (SE1), and

(iii) one second stop surface (SB2),

And described tube-shaped joint comprises one second tubular member (EF) on the other hand, and it has:

(i) female thread (FF), its idol is joined described external screw thread (FM), and tightens thereon,

(ii) one second annular lip (L2), it has one and is bearing in second outer surface (SE2) and one second internal surface (SI2) that the 3rd stop surface (SB3) on described second stop surface (SB2), is arranged with respect to described first internal surface (SI1),

A (iii) four-axial stop surface (SB4), and

(iv) one the 3rd internal surface (SI3), it extends between described four-axial stop surface (SB4) and the described female thread (FF), and form an annular cavity (LO) of joining with described first lip (L1) idol with described second outer surface (SE2) and the 4th stop surface (SB4)

It is characterized in that, described second stop surface (SB2) and described the 3rd stop surface (SB3) are the conical surfaces, the described conical surface is horizontal plane with respect to one with longitudinal direction (A) and has the substantially the same inclination of angle, described angle is selected to: described second stop surface (SB2) is bearing on described the 3rd stop surface (SB3), thereby first internal surface (SI1) that makes described first lip (L1) and one of first outer surface (SE1) abut in respectively described second outer surface (SE2) or described the 3rd internal surface (SI3) go up form first radially tight seal contact, like this, when later on distensible tube-shaped joint being carried out expanded in diameter in the plastic deformation scope, described first outer surface (SE1) is compelled to local one second tight seal that forms with described the 3rd internal surface (SI3) and contacts.

2. joint according to claim 1, it is characterized in that, it is projection and recessed that the described conical surface of described second stop surface (SB2) and described the 3rd stop surface (SB3) is respectively, and goes up radially tight seal contact of formation described first so that described first internal surface (SI1) abuts in described second outer surface (SE2).

3. joint according to claim 1, it is characterized in that, the described conical surface of described second stop surface (SB2) and described the 3rd stop surface (SB3) is respectively recessed and projection, goes up and forms the described first radially tight seal contact so that described first outer surface (SE1) abuts in described the 3rd internal surface (SI3).

4. joint according to claim 1 is characterized in that, originally described inclination is+5 ° to+30 ° approximately approximately.

5. joint according to claim 1, it is characterized in that, described first lip (L1) and described chamber (LO) originally have selected shape, so that the described first tight contact only forms after described second stop surface (SB2) is bearing on described the 3rd stop surface (SB3).

6. joint according to claim 1 is characterized in that, described first stop surface (SB1) is arranged to: force to be bearing on described the 4th stop surface (SB4) when tightening, be subjected to axial compression to cause described first lip (L1) in regime of elastic deformation.

7. joint according to claim 1, it is characterized in that, second outer surface (SE2) of described second lip (L2) originally have in the joint of itself and described the 3rd stop surface (SB3) one with respect to described longitudinal direction (A) tilt one about 8 ° to about 12 ° annular portion.

8. joint according to claim 1 is characterized in that, described first internal surface (SI1) of described first lip (L1) originally with respect to described longitudinal direction (A) tilt one about 0.1 ° to about 15 ° angle.

9. joint according to claim 1 is characterized in that, the ratio of described second lip (L2) between extension (PR) on the longitudinal direction (A) and described chamber extension (H) in a lateral direction is about 1 to about 3.

10. joint according to claim 1 is characterized in that, described external screw thread (FM) and female thread (FF) originally have the screw thread of being furnished with a carrying limit, and described carrying limit has a pact-3 ° negative angle to-15 ° of pacts.

11. joint according to claim 1 is characterized in that, described external screw thread (FM) and female thread (FF) originally have the screw thread of being furnished with an engagement limit, and described engagement limit has a pact+10 ° positive angle to+30 ° of pacts.

12. joint according to claim 11 is characterized in that, described external screw thread (FM) and described female thread (FF) are arranged to: after tightening and before expansion, between its engagement limit, have the axial clearance of an about 0.05mm to about 0.3mm.

13. joint according to claim 1, it is characterized in that described first tubular member (EM) is originally located at its first outer surface (SE1), in its first portion (P1) before, have a tapered slope, described tapered slope limits one first local annular recess (DC1) inwardly.

14. joint according to claim 13 is characterized in that, described inclined-plane with respect to longitudinal direction (A) have one about 8 ° to about 12 ° continuous basically gradient.

15. joint according to claim 1, it is characterized in that, described first tubular member (EM) is furnished with a second portion (P2), it is located at one the 4th internal surface (SI4) that extends described second stop surface (SB2), direction along first portion (P1), originally has a selected part annular thickness surplus (SA1), described the 3rd internal surface (SI3) has a groove (G1) at a selected position, this groove is suitable for being arranged in basically described local thickness surplus (SA1) and locates after tightening, and be suitable for when carrying out expanded in diameter, locate to form an annular shoulder (EP) at first outer surface (SE1), this annular shoulder (EP) has the configuration of the described groove of at least a portion (G1), and seals contact with it closely.

16. joint according to claim 1, it is characterized in that described first tubular member (EM) is originally located in its first portion (P1), be right against on the internal surface of described external screw thread (FM) at it, have a taper undergauge, in this taper undergauge, form one second local annular recess (DC2).

17. joint according to claim 16 is characterized in that, originally described undergauge increases basically continuously along the about 2 ° of extremely about 20 ° gradients with respect to longitudinal direction (A).

18. joint according to claim 15 is characterized in that, described groove (G1) has at least two curved portion, and (originally C1 C2), and is just being set.

19. joint according to claim 18 is characterized in that, (C1 C2) originally has substantially the same radius of curvature to described curved portion.

20. joint according to claim 19 is characterized in that, originally described radius of curvature is that about 2mm is to about 60mm.

21. joint according to claim 18 is characterized in that, (C1 C2) is separated by a middle body (PC) that is cylindricality basically described two curved portion.

22. joint according to claim 18, it is characterized in that, described groove (G1) originally has a radial depth (H '), the maximum value of this radial depth (H ') is selected to: the pipe that the material section of the bottom of described groove (G1) belongs to greater than described first tubular member (EM) and second tubular member (EF) (T1, the product of the stretching efficiency factor of the smallest cross-sectional of part and described joint usually T2).

23. joint according to claim 1 is characterized in that, described external screw thread (FM) and female thread (FF) are selected in tapered screw thread and cylindricality formula screw thread, each all be formed at least a portion tubular member (EM, EF) on.

24. joint according to claim 1 is characterized in that, described first tubular member (EM) is furnished with first outer surface (SE1) of a projection.

25. joint according to claim 1 is characterized in that, described second tubular member belongs to " recessed the moon/recessed the moon " adapter sleeve (M) of substantial symmetry of type, and described first tubular member (EM) belongs to an end of the big pipe of a length.

26. joint according to claim 25, it is characterized in that, described sleeve pipe (M) has a middle body (PCM), this middle body (PCM) in both sides by two second tubular member (EF1, EF2) extend, and originally on an outer surface, is furnished with an annular region (G2), in shortage being selected to of this annular region (G2) thickness: the original depth that described sleeve pipe (M) is located at this zone (G2) is formed at pipe (T1, the product of the cross section of common part T2) and the efficiency factor of joint of its end more than or equal to described first tubular member (EM).

27. according to each described joint in the claim 4 to 26, it is characterized in that, it is projection and recessed that the described conical surface of described second stop surface (SB2) and described the 3rd stop surface (SB3) is respectively, and goes up radially tight seal contact of formation described first so that described first internal surface (SI1) abuts in described second outer surface (SE2);

Described first lip (L1) and described second lip (L2) originally have selected shape, so that before described second stop surface (SB2) was bearing on described the 3rd stop surface (SB3), described first stop surface (SB1) was bearing on described the 4th stop surface (SB4).

28. according to each described joint in the claim 4 to 26, it is characterized in that,

The described conical surface of described second stop surface (SB2) and described the 3rd stop surface (SB3) is respectively recessed and projection, goes up and forms the described first radially tight seal contact so that described first outer surface (SE1) abuts in described the 3rd internal surface (SI3);

The 3rd internal surface (SI3) of described second tubular member (EF) is originally in the joint of itself and described the 4th stop surface (SB4), have a primary sealing area (DC3), this primary sealing area (DC3) has the selected inclination of an angle with respect to longitudinal direction (A) generally; Described first tubular member (EM) is originally located at its first outer surface (SE1), joint at itself and described first stop surface (SB1), has a secondary sealing area (DC4), this secondary sealing area (DC4) has the selected inclination of an angle with respect to longitudinal direction (A) generally, so that when tightening, described primary sealing area (DC3) and radial compaction of secondary sealing area (DC4) contact thereby form the 3rd tight seal on another.

29. joint according to claim 28, it is characterized in that, described primary sealing area (DC3) and secondary sealing area (DC4) are arranged to: described first tight seal contact is formed between described primary sealing area (DC3) and the secondary sealing area (DC4) after described the 3rd tight seal contact, so that strengthen described the 3rd tight seal contact.

30. joint according to claim 28 is characterized in that, the described selected angle of described primary sealing area (DC3) and described secondary sealing area (DC4) originally is+1 ° to+30 ° approximately approximately.

31. joint according to claim 28 is characterized in that, at least one is a conical surface in described primary sealing area (DC3) and the described secondary sealing area (DC4).

32. joint according to claim 28 is characterized in that, at least one is a convex surface in described primary sealing area (DC3) and the described secondary sealing area (DC4).

33. joint according to claim 32 is characterized in that, described convex surface has an annular portion.

34. joint according to claim 28 is characterized in that, described primary sealing area (DC3) is limited by the 3rd a part annular recess towards the inside of described the 3rd internal surface (SI3).

35. joint according to claim 28 is characterized in that, described secondary sealing area (DC4) is formed by the 4th a part annular recess towards the inside of described first outer surface (SE1).

36. joint according to claim 9 is characterized in that, the ratio of described second lip (L2) between extension (PR) on the longitudinal direction (A) and described chamber extension (H) in a lateral direction is about 1.2 to about 1.6.

37. joint according to claim 1, it is characterized in that second outer surface (SE2) of described second lip (L2) originally has one with respect to described longitudinal direction (A) about 10 ° annular portion that tilts in the joint of itself and described the 3rd stop surface (SB3).

38. joint according to claim 1 is characterized in that, the ratio of described second lip (L2) between extension (PR) on the longitudinal direction (A) and described chamber extension (H) in a lateral direction is about 1.2 to about 1.6.

39. the implementation methods of tubular sealing expansion nipple is characterized in that, each described distensible tube T-joint in requiring based on aforesaid right is characterized in that:

-tighten described first tubular member (EM) and described second tubular member (EF), be received in the described annular cavity (LO) until described first lip (L1), and be bearing on described the 3rd stop surface (SB3) until described second stop surface (SB2), so that one of described first internal surface (SI1) of described first lip (L1) and outer surface (SE1) respectively hermetically radial compaction on described second outer surface (SE2) or described the 3rd internal surface (SI3), form the first radially tight seal contact, and

-by means of an axial motion type expanding tool, make described distensible tube T-joint in the plastic deformation scope, carry out expanded in diameter, so that force local second tight seal that forms of described first outer surface (SE1) and described the 3rd internal surface (SI3) to contact.

40. according to the described method of claim 39, it is characterized in that, from described first lip (L1) and described second lip (L2), described lip has selected shape, so that the described first tight contact is based upon between described first internal surface (SI1) and described second outer surface (SE2); The described first tight contact only forms after described second stop surface (SB2) is bearing on described the 3rd stop surface (SB3).

41., it is characterized in that described tightening at first forces described first stop surface (SB1) to be bearing on described the 4th stop surface (SB4), is subjected to axial compression to cause described first lip (L1) in regime of elastic deformation according to the described method of claim 40.

42. according to the described method of claim 39, it is characterized in that, from distensible tube T-joint according to claim 28; Described tightening forces described primary sealing area (DC3) and radial compaction of described secondary sealing area (DC4) on another, at first form described the 3rd tight seal contact, form described first tight seal contact then, it strengthens described the 3rd tight seal contact.

43., it is characterized in that described expansion forms the contact of the 4th tight seal according to each described method in the claim 39 to 42 between free end of described first internal surface (SI1) and described second outer surface (SE2).

44., it is characterized in that the radial dilatation of described joint is carried out according to the spreading rate that equals 10% at least according to each described method in the claim 39 to 42.

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