Classifications

• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
  • E21B17/02—Couplings; joints
  • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
  • E21B17/042—Threaded
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
  • E21B17/02—Couplings; joints
  • E21B17/08—Casing joints
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
  • F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings

Definitions

• the present invention relates to a tubular component for connecting, by makeup, to an analogous component in order to form a contiguous pipework.
• the invention is of application in producing a stem formed by drill pipes, heavy weight drill pipes and drill collars, which are regularly fitted together and broken apart.
• a stem of this type may in particular be used when driven in rotation in order to drill hydrocarbon wells.
• tubular components of this type may also be used in a drill pipe riser or indeed a riser when operating a well of this type.
• Each tubular component comprises at least one end element, male or female, which is threaded.
• a tubular component comprises a male threaded end element and an opposed female threaded end element.
• the threaded end element is intended to be made up with the complementary threaded end element of another component. When connected, the two end elements of the two components form a connection.
• a threaded end element of a connection comprises at least one axial abutment which is activated at the end of makeup and clamped against a corresponding surface by application of a predetermined makeup torque.
• the makeup torque applied at the end of tightening is known as the torque on shoulder, as it corresponds to the torque necessary for activation of the axial abutments.
• makeup/breakout operations are carried out on-site under difficult conditions, for example on offshore platforms. Actual makeup conditions may be very different from the theoretical conditions in a laboratory.
• a threaded end element of a connection may comprise two axial abutments which are axially separated, respectively inner and outer, which are activated at the end of makeup and clamped against corresponding surfaces by the application of a predetermined nominal makeup torque.
• the predetermined makeup torque for these connections is increased by doubling the surfaces which are engaged in abutment.
• the invention improves the situation by proposing tubular components which can be used to resist higher operational loads by proposing a higher nominal makeup torque than that of existing connections, without increasing either the outer dimensions of the connection nor the weight of the string.
• another advantage of the invention is that it proposes an end element, in particular an abutment, the integrity of which is maintained throughout its use, and for which the seal against liquids is ensured even after several makeup-breakout operations.
• a tubular component in accordance with the invention has at least one abutment the active surfaces of which are more extensive than those of known tubular components.
• the configuration of the invention means that the local contact pressures are not increased, thereby preventing plastification and guaranteeing that the abutments hold under tension traction and thus remain impervious even in service.
• the contact pressures on the abutment surfaces of the invention are subjected to loads per unit surface area which are identical to those of conventional annular surfaces or ring surfaces.
• the makeup torque beyond which plastification phenomena may occur is thus higher.
• the invention provides a tubular drill stem component comprising an end element having an axis of revolution and provided with a threading extending about the axis of revolution, the end element being adapted to being connected by makeup onto a corresponding end element of another tubular component provided with a complementary threading, the end element comprising at least one outer abutment arranged so as to come into contact with a corresponding outer abutment of the other component at the end of makeup, in which said outer abutment comprises at least one helical surface having an axis of the helix which coincides with the axis of revolution.
• the Applicant proposes a connection comprising two end elements of two distinct components as hereinbefore defined.
• the two components are connected to each other by making up the end element of the first component with the corresponding end element of the second component.
• the component may have the following optional characteristics, either alone or in combination with each other.
• the threading has a thread angle such that the helical surface or surfaces may have a helix angle less than or equal to the thread angle of the threading.
• the helix angle may be in the range 0.5° to 7°.
• a sum of the angular portions about the axis of revolution over which the helical surface extends may be in the range 180° to 360°.
• the end element further comprises a circumferential shoulder connected to at least one of the circumferential ends of said helical surface.
• this circumferential shoulder may comprise at least one substantially planar surface the plane of which forms an angle with the axis of revolution in the range 0° to 75°.
• the circumferential shoulder may comprise at least one substantially planar surface the plane of which may be parallel to the axis of revolution or may coincide with the axis of revolution.
• the circumferential shoulder may be connected to the helical surface via a fillet radius or an inclined plane.
• a fillet radius when present, this may have a radius of curvature in the range 0.5 to 10.0 millimetres.
• the end element may comprise two abutments, an inner abutment and an outer abutment, each of the two abutments comprising at least one circumferential shoulder.
• the end element may comprise these two abutments, respectively the inner abutment and the outer abutment, such that only the outer abutment is provided with a helical surface.
• the end element may comprise a single helical surface located solely on the outer abutment.
• the helical surface may be at a distance from the threading; a distance between a threading end and the helical surface may in particular be at least 8 mm.
• the invention also concerns a connection comprising two components in accordance with the invention, in which one of the outer abutment of a component or the corresponding outer abutment of the other component is disposed at a free distal end of its end element.
• FIG. 1 is a longitudinal partial sectional view of two components in accordance with the invention.
• FIG. 2 is a perspective view of a male end element of a component in accordance with the invention.
• FIG. 3 is a perspective view of a variation of a male end element of a component in accordance with the invention.
• FIG. 4 is a perspective view of a female end element of a component in accordance with the invention, corresponding to that of Figure 3;
• FIGS. 5 to 8 are perspective views of variations of a detail of an end element of a component in accordance with the invention.
• FIGS. 9, 10 and 11 are perspective views of variations of a male end element of a component in accordance with the invention.
• FIG. 12 is another variation of a male end element, provided with three helical surfaces in accordance with the invention.
• a first tubular component 1 and a second tubular component 101 are represented in Figure 1.
• the components 1 and 101 are generally in the form of a body of revolution about an axis of revolution XX.
• the components 1 and 101 are aligned with each other.
• the axes of revolution XX therefore coincide.
• the direction of the axis of revolution XX is termed the axial direction.
• the numerical references for the second component 101 are greater by 100.
• Each of the components 1 and 101 comprises an end element 2 or respectively 103.
• the first component 1 comprises a male end element 2 (or pin)
• the second tubular component 101 comprises a female end element 103 (or box).
• the components 1 and 101 each comprise a regular tube portion 9 or 109.
• the regular portion 9 of the tube is integral with the male end element 2 and at an opposite end is also integral with a second female end element (not shown) which is identical to the female end element 103.
• the regular tube portion 109 is integral with the female end element 103 and at an opposite end is also integral with another male end element (not shown) which is identical to the male end element 2.
• the regular tube portions 9 and 109 of the two components 1 and 101 are similar to each other.
• the tubular components 1 and 101 are impermeable in structure and in material.
• the tubular components form metallic structures, in particular produced from steel or Inconel.
• the grade of the material is of the order of 130 ksi, with a yield strength in the range 120 000 to 140 000 psi; however, it may also be selected from higher grades of about 140 ksi, 150 ksi and 165 ksi, as well as from lower steel grades such as those defined at about 80 ksi or 95 ksi or even 110 ksi.
• the end elements 2 and 103 may be produced from a material which is identical to or different from that of the tubes 9 and 109.
• the end elements in particular 2 and 103, have a configuration which conforms with the standard API-7 or API-RP-7G or indeed ISO- 10407- 1.
• the end elements 2 and 103 have a proprietary configuration, for example as marketed under the trademark VAM®
• the regular portion 9 is generally cylindrical in shape and has a length in the range 5 to 15 metres for long components, for example drill pipes, and 1 to 5 metres for short components, for example wear inserts used at the well head.
• the inner diameter is, for example, in the range 25 to 400 millimetres, while the external diameter is in the range 50 to 500 millimetres.
• the component 1 may be obtained by friction welding the end elements to each end of a tube forming the regular portion 9. The same mode of production may be employed for the component 101. In such cases, the ends of the regular portion 9 may have already been forged, upset or thickened so as to increase the radial surface of the metal.
• a weld plane 5 or 105 is respectively formed at the junction between the regular tube portions 9 and 109 with the end elements 2 and 103 respectively.
• the tubular component may be integral, namely without a weld, obtained from a single blank.
• the regular portions 9, 109 are not shown in Figures 2 to 8.
• the end elements 2, 103 are generally tubular in shape.
• the end elements 2, 103 have an exterior surface 11, respectively 121, which is substantially cylindrical.
• the end elements 2, 103 carry an interior surface 17, respectively 127, or bore, which is substantially cylindrical.
• the surfaces of revolution of the components 1 and 101 are substantially concentric with a centre belonging to the axis of revolution XX.
• the thicknesses of the walls of the components 1, 101 are substantially homogeneous in circumference, except at the positions of the end elements.
• the components 1 are manipulated using rams.
• the rams will hold the components 1 by means of their end elements 2 or 103.
• the end elements 2 and 103 are better suited to withstanding the loads applied, in particular during makeup/breakout operations.
• the exterior contact surfaces 11 or respectively 121 locally have a largest exterior diameter intended to be taken up in the jaws of working tongs in order to guarantee the final makeup torque of the connection to be formed. This exterior contact surface is that which will come into factional contact against the walls of the well during rotation of the drill stem.
• the male end element 2 comprises a substantially tapered exterior surface 12 in which at least one exterior threading known as the male threading is formed.
• the end element 2 further comprises an end surface 13 and a central surface 16.
• the exterior tapered surface 12 is located axially between the end surface 13 and the central surface 16.
• the end surface 13 and the central surface 16 are free of any threading.
• the end surface 13 and the central surface 16 have a substantially cylindrical profile.
• the tapered exterior surface 12 with the threading comprises a threading having a single-start thread.
• the end surface 13 connects to a surface 15 extending substantially in accordance with the thickness of the end element 2, substantially perpendicular to the end surface 13.
• This surface forms an inner abutment 15.
• the inner abutment 15 defines the free distal end of the end element 2 of the component 1 in the disconnected condition.
• This inner abutment 15 connects on the inside to an interior surface 17 which is substantially cylindrical.
• the inner abutment 15 is termed the male inner abutment.
• the central surface 16 is connected to the exterior contact surface 11 via a surface which extends substantially along a portion of the thickness of the end element 2. This surface forms an outer abutment 18.
• the outer abutment 18 forms an exterior shoulder of the end element 2 of the component 1.
• the outer abutment 18 is termed the male outer abutment.
• At least one of the inner abutment 15 and the outer abutment 18 has a helical surface.
• this helical surface is produced on the outer abutment 18, as was the case with the helical surface 38 of Figure 2.
• the helical surface 38 is at a distance from the threading.
• An axial length Dl for the central surface 16 which is free of threading may be defined; in particular, this distance Dl is at least 8 mm and, for example, less than 24 mm.
• This distance Dl corresponds to the minimum axial distance along the axis XX between the helical surface 38 and the substantially tapered exterior surface 12 carrying the threading.
• the helical surface 38 is defined by an axis of the helix which coincides with the axis of revolution XX.
• the sense of the helix of the helical surface 38 corresponds to that of the threading of the tapered exterior surface 12.
• the helical surface 38 has a helix angle which has the reference a (alpha).
• the threading of the tapered exterior surface 12 has a thread angle with reference ⁇ (beta).
• the helix angle a of the helical surface 38 in this example is equal to the thread angle ⁇ of the threading.
• the helical surface 38 is not flat. From another viewpoint, the helical surface 38 defines a surface the position of which varies along the axial direction as a function of the angular portion of the component 1, or angular sector, under consideration.
• the outer abutment 18 is connected to the exterior surface 11 via an annular chamfer 20.
• the end element 2 is shown with two helical surfaces, such that the inner abutment 15 comprises a helical surface 35 and the outer abutment 18 comprises the helical surface 38.
• D2 of the end surface 13 which is free of threading may be defined, this distance D2 in particular being at least 8 mm, for example less than 24 mm.
• This distance D2 corresponds to the minimum axial distance, along the axis XX, between the helical surface 35 and the substantially tapered exterior surface 12 carrying the threading.
• This distance D2 also corresponds to the axial distance between the free distal end of the end element 2 and the threaded exterior surface 12.
• each angular portion of the helical surface 38 extends in a radial direction, i.e. perpendicular to the axis of revolution XX.
• the profile of the helical surface 38 viewed in a longitudinal section passing through the axis of revolution XX, may be represented by a straight segment orientated in a radial direction.
• the width of the helical surface 38 is thus substantially equal to the radial distance of the outer abutment 18.
• Analogous reasoning applies to the helical surface with respect to the inner abutment 15.
• the profile of the helical surface 38 may be straight and have a non-zero inclination with respect to a radial direction.
• the helical surface 38 has a generally tapered configuration.
• the width of the helical surface 38 is thus substantially greater than the radial thickness of the outer abutment 18.
• the profile of the helical surface 38 may be curved, for example concave or convex.
• the radial width of the helical surface 38 is thus substantially greater than the outer abutment 18.
• the helical surfaces 35 and 38 extend over the whole circumference of their respective abutments, i.e. approximately 360°.
• the helix angle a of the helical surfaces 35 and 38 are substantially identical.
• the helix angle a is substantially equal to the thread angle ⁇ of the threading of the tapered exterior surface 12.
• the helix angle a of the helical surface 38 is in the range 0.5° to 7°, for example.
• the presence of the helical surfaces 35 and 38 results in the formation of a circumferential shoulder 36 or respectively 39 on each of the abutments 15 and 18.
• the two circumferential shoulders may be substantially planar, each forming a plane comprising the axis XX. They may be designed so as to be in the same plane.
• the outer abutment 18 of the end element 2 thus comprises the circumferential shoulder 39.
• the circumferential shoulder 39 extends over an axial position of the end element 2 which is identical to that over which the helical surface 38 extends.
• the circumferential shoulder 39 connects the two circumferential ends of the helical surface 38 one to another.
• Figure 5 shows a detail of the circumferential shoulder 36 of the embodiment of Figure 3.
• the two circumferential ends of the helical surface 35 are aligned in the axial direction, and so here, the circumferential shoulder 36 exhibits a zero circumferential component.
• the circumferential ends of the helical surface 38 are aligned in the axial direction, with the circumferential shoulder 39 here having a zero circumferential component.
• the circumferential shoulder 39 defines a plane passing through the axis XX.
• the circumferential shoulders 36 and 39 are defined in the same plane.
• the circumferential shoulder 36 comprises a substantially planar surface.
• the plane of the planar surface forms an angle ⁇ (gamma) with the axis of revolution XX.
• the plane of the respective planar surface of the circumferential shoulders 36 and 39 here is substantially coincident with the axis of revolution XX.
• the angle ⁇ is thus substantially zero.
• the planar surface of the circumferential shoulders 36 and 39 extends substantially perpendicular to the helical surfaces 35 and 38, plus or minus the helix angle a.
• circumferential shoulder 39 is connected to both of the circumferential ends of the helical surface 38 via sharp borders or edges. This is also the case in Figure 3 for the circumferential shoulders 36 and 39.
• Figures 6, 7 and 8 show variations of the helical surfaces. To make these variations more legible, they are shown on the inner abutment 15. Clearly, each of the variations may also be applied to the embodiment in which the helical surface is on the outer abutment 18 as shown in Figures 9, 10 and 11. These variations are primarily distinguished from the embodiment of Figure 3 in that the helical surface 35 extends over an angular portion of less than 360°. The two
• circumferential ends of the helical surface 35 are out of alignment in the axial direction.
• the circumferential shoulder 36 linking them has a non-zero circumferential component.
• the circumferential shoulder 36 extends over an angular portion of several degrees, for example between 1° and 15°.
• the profile of the surfaces of the circumferential shoulder 36 may be represented by straight segments orientated in a radial direction.
• the profile of the circumferential shoulder 36 is straight and has an inclination with respect to a radial direction.
• the profile of the surfaces of the circumferential shoulder 36 may be curved, for example concave or convex.
• the circumferential shoulder 36 comprises a substantially planar surface.
• the plane of the planar surface forms an angle ⁇ with the axis of revolution XX.
• the angle ⁇ is non-zero, for example in the range 0° to 75°.
• the circumferential shoulder 36 is connected to both of the circumferential ends of the helical surface 35 via sharp borders or edges.
• the circumferential shoulder 36 comprises two fillet radii, one being concave and the other, convex.
• the fillet radii each have a radius of curvature, respectively with references Rl and R2.
• the connections between the circumferential shoulder 36 and the helical surface 35 do not have a sharp border or edge.
• the circumferential shoulder 36 might not have a planar surface, so that the fillet radii are connected to each other via a point of inflexion in a manner such that the circumferential shoulder 36 forms a substantially continuous link between the two circumferential ends of the helical surface 35.
• the radii of curvature Rl and R2 are substantially equal.
• the radii of curvature Rl and R2 are in the range 0.5 to 10 millimetres, for example.
• the circumferential shoulder 36 comprises two substantially planar, mutually intersecting surfaces.
• a first plane 36' forms a zero angle ⁇ with the axis of revolution XX.
• the planar surface is connected to one of the two circumferential ends of the helical surface 35 via a second plane 36" in the form of a chamfer, here at substantially 45°.
• the chamfer is provided on the side of the concave connection with the helical surface 35.
• a chamfer may be provided on the side of the convex connection with the helical surface 35.
• the helical surface 35 extends over a little more than 360°, i.e. one turn plus a few degrees, for example between 361° and 365°.
• the circumferential end portions of the helical surface 35 are then slightly superimposed in the axial direction at a singular angular portion of the component 1.
• the circumferential shoulder 36 is then shaped into a concavity connecting the two circumferential ends of the helical surface 35 with each other.
• the inner abutment 15 might not have a helical surface, while the inner abutment is provided with a single helical surface in one of the variations.
• the abutment 15 comprises a helical surface 35 which extends over an angular portion which is significantly less than 360°, for example less than 270°, or more preferably less than 180° or less than 90°.
• the abutment then comprises said single helical surface, a single circumferential shoulder and the remaining angular portion of the abutment which then defines a surface in the form of a portion of a ring.
• the profile of the surface in the form of a portion of a ring may be planar and parallel to a radial direction, planar and inclined with respect to a radial direction or indeed curved, for example convex or concave.
• the abutment 18 comprises the surface in the form of a portion of a ring, the helical surface 38 and the circumferential shoulder 39, in succession along the circumference.
• the circumferential shoulder 39 connects a circumferential end of the helical surface 38 to a circumferential end of the surface in the form of a portion of a ring.
• the abutment 18 comprises at least two helical surfaces 38.
• the abutment 18, as a consequence, comprises as many circumferential shoulders 39 as there are helical surfaces 38.
• the abutment 18 comprises, in succession along the circumference, a first helical surface 38', a first circumferential shoulder 39', a second helical surface 38", and a second circumferential shoulder 39".
• the inner abutment 15 also has a helical surface 35, and so it constitutes an embodiment with three helical surfaces.
• the presence of N helical surfaces may be combined with N planar surfaces in the form of a portion of a ring.
• the abutment then comprises a succession of N ensembles along the circumference, constituted by a helical surface, a surface in the form of a ring and a circumferential shoulder.
• the sum of the angular portions over which the N helical surfaces extend is, for example, in the range 180° to 360°.
• first end element 2 of a component 1 may comprise:
• the circumferential shoulders 36 or respectively 39 may be disposed in the same angular portion of the component 1 , as seen in Figure 3, or be offset with respect to each other.
• FIG. 1 representing two embodiments of a female end element 103 of a component 101.
• the female end element 103 of Figure 4 corresponds to and matches the shape of the male end element 2 of the component 1 of Figure 3. Because the shapes match, at the very least it is to be expected that the inner abutment 15 and outer abutment 18 can be placed in sealing engagement over 360° with the corresponding surface carried by the female end element 103, and that the threaded portions can be engaged together.
• the female end element 103 comprises a substantially tapered interior surface 122 in which an interior threading is provided.
• the end element 103 further comprises an end or distal surface 126 and a central or proximal surface 123.
• the threading of the interior tapered surface 122 is located axially between the end surface 126 and the central surface 123.
• the end surface 126 and the central surface 123 are free of a threading.
• the end surface 126 and the central surface 123 are substantially cylindrical and match the shape of the central surfaces 16 and the end surfaces 13 of the male end element 2. A space is provided between these respective cylindrical portions in order to form a backflow zone for grease deposited on the threads; this grease might have been deposited in a quantity which is larger than the residual interstitial space provided between the threads at the end of makeup.
• the end surface 126 has a diameter which is larger than that of the central surface 123.
• the threading of the interior tapered surface 122 is located radially between the end surface 126 and the central surface 123.
• the axis of makeup corresponds to the axis of revolution XX.
• the sense of makeup is imposed by the sense of the complementary threadings of the exterior 12 and interior 122 tapered surfaces.
• the embodiment of Figures 3 and 4 comprises threadings with a conventional makeup sense, i.e. the end elements 2, 103 have right handed threads.
• the central surface 123 and the interior surface 127 are connected to each other via a surface extending substantially along a portion of the thickness of the end element 103. This surface forms an abutment 125.
• the inner abutment 125 forms an interior shoulder of the end element 103 of the component 101.
• the end surface 126 and the exterior surface 121 are connected one to the other via a surface extending substantially along the thickness of the end element 103. This surface forms an outer abutment 128.
• the outer abutment 128 defines the free distal end or terminal end of the end element 103 of the component 101 in the uncoupled state.
• the inner abutment 125 may be termed the female inner abutment, while the outer abutment 128 may be termed the female outer abutment.
• the inner abutment 125 of the end element 103 of the component 101 corresponds to the inner abutment 15 of the end element 2 of the component 1.
• the shape of the abutment 125 matches that of the abutment 15.
• the abutment 15 and the abutment 125 are arranged so as to come into clamping contact one against the other at the end of makeup, and so as to obtain, at all points of the inner abutment 15 facing the abutment 125, a sufficient contact pressure to ensure a seal against fluids, at least to liquids.
• the outer abutment 128 of the end element 103 of the component 101 corresponds to the outer abutment 18 of the end element 2 of the component 1.
• the shape of the abutment 128 matches that of the abutment 18.
• the abutment 18 and the abutment 128 are arranged so as to come into clamping contact one against the other at the end of makeup, and so as to obtain, at all points of the outer abutment 18 facing the abutment 128, a sufficient contact pressure to ensure a seal against fluids, at least to liquids.
• the end element 2 of the first component 1 corresponds to the end element 103 of the second component 101.
• the N helical surfaces 35, respectively 38, are homologues of the N helical surfaces with references 145, 148 respectively and the N circumferential shoulders 36 or respectively 39 are homologues of the N circumferential shoulders 146, respectively 149 provided on the end element 103.
• the helical surface 148 is distant from the threading.
• the end surface 126 which is free of a threading covers an axial distance D3 along the axis XX, distance D3 being not necessarily equal to the axial distance Dl.
• This axial distance D3 also corresponds to the distance between the free distal end of the end element 103 and the threaded interior tapered surface 122. is
• This non-zero axial distance D3 is at least 8 mm and, for example, less than 24 mm.
• the threadings of the exterior 12 and interior 122 tapered surfaces are complementary.
• the threadings of the exterior 12 and interior 122 tapered surfaces have a single thread.
• the threadings comprise several threads, for example two, three or four. These are known as multi-start threadings.
• the threadings have a constant pitch.
• the components 1 and 101 are aligned one with the other such that their axes of revolution XX coincide and the male element 2 of the first component 1 is disposed facing the female end element 103 of the second component 101.
• the male end element 2 is partially inserted into the female end element 103 by means of a translational movement along the axis of revolution XX to bring the components 1 , 101 towards each other;
• the exterior surfaces 1 1 and 121 are substantially in the extension of each other in the axial direction and are drawing closer to each other;
• the abutment 15 comes into contact against the abutment 125.
• the inner abutments 15 and 125 come into contact with each other;
• the abutment 18 comes into contact against the abutment 128.
• the outer abutments 18 and 128 come into contact with each other;
• the N helical surfaces 35 come into contact against the N helical surfaces 145.
• the helical surfaces 35 and 145 come into contact in pairs;
• the N helical surfaces 38 come into contact against the N helical surfaces 148.
• the helical surfaces 38 and 148 come into contact in pairs;
• the N circumferential shoulders 39 approach each other facing the N circumferential shoulders 149.
• the circumferential shoulders 39 and 149 approach each other in pairs.
• abutments in accordance with the invention comprising at least one helical surface have a larger active surface than abutments constituted by a surface in the form of a planar ring perpendicular to the axis of revolution XX as is known in the prior art.
• Shaping helical surfaces, for example by machining, into the planar surfaces of a tubular component means that the load transmission surface can be increased.
• the higher the pitch of the thread the larger may be the helix angle, and as a consequence the beneficial effect on the improvement of the nominal makeup torque may be obtained. It will be noted that advantageously, the gain in terms of the final makeup torque is larger when the thread is multi-start. Because the thread pitch is greater when there are more thread starts, increasing the thread angle means that an increase in the helix angle can be obtained.

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• Mutual Connection Of Rods And Tubes (AREA)
• Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
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• 2014
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