WO2006061577A1 - Raccord ameliore de tuyau - Google Patents

Raccord ameliore de tuyau Download PDF

Info

Publication number
WO2006061577A1
WO2006061577A1 PCT/GB2005/004625 GB2005004625W WO2006061577A1 WO 2006061577 A1 WO2006061577 A1 WO 2006061577A1 GB 2005004625 W GB2005004625 W GB 2005004625W WO 2006061577 A1 WO2006061577 A1 WO 2006061577A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
stop shoulder
pipe joint
box
frusto
Prior art date
Application number
PCT/GB2005/004625
Other languages
English (en)
Inventor
Ian Harold Hignett
Original Assignee
Hgds Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0426628A external-priority patent/GB0426628D0/en
Priority claimed from GB0428350A external-priority patent/GB0428350D0/en
Priority claimed from GB0520476A external-priority patent/GB0520476D0/en
Application filed by Hgds Inc filed Critical Hgds Inc
Priority to MX2007006784A priority Critical patent/MX2007006784A/es
Priority to EP05811593A priority patent/EP1828658A1/fr
Publication of WO2006061577A1 publication Critical patent/WO2006061577A1/fr

Links

Classifications

    • 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
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface

Definitions

  • the present invention relates to an improved screw-threaded pipe joint, the pipes being intended for the transport of fluids such as oil and gas.
  • the joint is particularly suited for use in pipes subject to both bending and compressive forces.
  • Threaded connections for pipes are well known in the gas and oil industry.
  • the pipes to which the connections are applicable include those which are used in both the exploration for and the transport of fluid materials. Because of the nature of the materials and the pressures at which the pipes operate it is important that the seal in the joints between adjacent pipe sections remains effective. Such joints can be difficult to maintain due to the forces to which the length of the pipe is normally subjected.
  • the forces can, on a particular joint, be compressive or tensive along the axis of the pipe or both tensive and compressive for example, when the pipe is in a curved configuration.
  • the forces, together with pressure differentials across the width of the pipe can weaken a seal and create a pathway for the fluid within the pipe to leak out.
  • the threaded portion of the joint is angled with respect to the main axis of the pipe sections.
  • a frusto-conical, non-threaded shoulder is normally included at the end of the male section of pipe (the male section often being referred to as the pin) with a corresponding recess in the female section (often referred to as the box).
  • the shoulder can also include curved portions, chamfers and other features to improve the strength of the resulting seal.
  • an external pipe joint between a pin section and a box section the end of the pin and box sections having complementary screw-threaded portions, adapted to interengage along the greater part of the axial length thereof, the threads being inclined in the same direction and at an acute angle to the longitudinal axis of the joint, the box section extending at least to a stop shoulder having a frusto-conical head portion which is positioned adjacent a complementary stop shoulder recess on the pin section; the complementary stop shoulder recess comprising a cone receiver having a frusto-conical cross-section and adapted to sealingly receive the frusto-conical head portion; wherein the box section includes an annular groove intermediate the threaded portion and the stop shoulder. The groove permits the root of the threads to be cut more deeply into the wall of the box section so enabling the crest heights to remain constant along the length of the thread. Moreover, the box section is strengthened as stress forces within the box section are better distributed.
  • the crest heights of the threaded portion remain constant along the length of the thread.
  • the thread therefore is stronger to resist tensive forces on the two sections which provide the pipe joint.
  • the taper subtends an angle of 2-3° with the axis of the pipe joint.
  • the surface of the stop shoulder is substantially parallel to the axis of the pipe joint includes one or more inwardly convexed curved portions. Said curved portions distribute stress within the joint enable a better seal to be formed. Particularly preferably, said surface of the stop shoulder additionally comprises a substantially flat portion.
  • the groove advantageously has a rectangular cross-section.
  • one or both of the sides of the rectangle are linked to the base of the rectangle by a curved surface.
  • the inclusion of the curves or other connecting surfaces redistributes stress within the box section.
  • Figure 1 is an illustration of the crest of a Box thread
  • Figure 2 is an illustration of the crest of a Pin thread
  • Figure 3 is a further illustration of a Pin Design
  • Figure 4 is a further illustration of a Box Design, including a groove;
  • Figure 5 illustrates the stress included within a joint;
  • Figure 6 show the effect of inclusion of grooves of different depth, on the behaviour of the joint when torque is applied to form the pipe joint
  • Figures 7 A - 7G illustrate the effect of including a groove when the joint is subjected to compression and tension
  • Figures 8A 3 8B illustrate cross-sectional profiles of a groove
  • Figures 1 and 2 show a crest of part of the box thread and of the pin thread respectively, which threads are known in the art and are suitable for use in conjunction with the present invention.
  • the thread is normally set at an angle to the longitudinal axis of the pipe joint.
  • faces 11 and 21 face in the direction along the major length of the pipe section and engage or at least abut each other. These faces 11 and 21 subtend an angle of 10 degrees to a surface perpendicular to the axis of the pipe section.
  • the faces 12 and 22 also engage or abut each other in use.
  • the slope of the faces 12, 22 is approximately 45 degrees to the surface perpendicular to the axis of the pipe.
  • Threads can be seen to have a number of curved portions 13A, B, C, D and 23 A,
  • the crest height is approximately 0.08 cm (0.033") as measured from the thread root.
  • the pin 30 can be seen, in Figure 3, to have a stop shoulder 31 at its distal end beyond the end of the threaded section 32.
  • the stop shoulder 31 has a head portion 33 of generally frusto-conical section with line A as the base, and having a rounded apex 34.
  • the stop shoulder 31 engages a correspondingly shaped recess 41 ( Figure 4) of the box 40.
  • the surface 35 of the stop shoulder 31 or the corresponding surface 43 of the recess can include curved portions - the curvature projecting from the one pipe section towards the other pipe section - to improve the seal.
  • the curvature enables a seal to be maintained, even when the pipe joint is subject to bending forces such as in the situation where the longitudinal axes of the individual pipes making up the joint are not aligned with one another.
  • the curvature introduced need not be continuous along the entire length of the surface 34 or 35 but can simply run along a portion of the surface. It is believed that where an already formed joint is subject to bending forces the curvature enables the seal to slide along the curved portion so that the seal remains fluid tight.
  • the inner wall of the pin is thickened along a portion 35 to increase the strength of the pin and minimise its tendency to bend on application of torque.
  • the distal stop shoulder 44 of the box section which in use forms an outer seal with a corresponding recess 36 of the pin 30 can include features as described above for the stop shoulder 31.
  • the box section includes an annular groove 45 intermediate the distal end 44 and the final crest 42A of thread 42.
  • the groove 45 fulfils a number of functions. Firstly, the groove 45 enables the crest heights of the thread 42 to remain constant along the length of the thread and to retain a reasonable angle with respect to the pipe's axis. Typically, the height of the crest is reduced towards the distal end of a box section.
  • one end of the threaded portion is effectively displaced radially compared to prior art threads. Given a fixed longitudinal distance between the two ends of a thread, the length of the threaded portion of the present invention will be greater than for prior art threads. The longitudinal density of threads is therefore greater for the threads of the present invention than for those of the prior art and the strength of the threaded joint is thereby increased.
  • the groove 45 in that the stresses within the box section are concentrated in a small area. This is illustrated in Figure 5 in which darker areas indicate areas under higher stress.
  • the box section 50 includes a groove 51 behind the stop shoulder 52. The area around the groove 51 can be seen to be under higher stress than the stop shoulder
  • the higher stress area 53 is surrounded by material of lower stress, which assists in the harmless dissipation of the resultant strain in the material, so that the high strain does not cause significant damage.
  • Figure 6 illustrates the torque required to make up the pipe joint.
  • the x axis on the graph shows the distance between the shoulders 44 and recess 36 of the box and pin respectively.
  • the y axis shows the torque required to turn the joint components.
  • the graph shows the lines corresponding to five values of stand, that is the distance between the shoulder and the thread. As can be seen, once the stop shoulder 44 of the box section engages the pin, the torque required dramatically increases.
  • the performance of joints including a rectangular groove as described above is illustrated in the attached graphs Figure 7A - G.
  • the T and C relate to tensive and compressive force applied to the pipe, and I95V refers to an applied internal pressure.
  • the cross-section of the groove 45 can be made substantially rectangular as shown in Figure 8A.
  • the groove can include a sloping or a curved surface joining the base of the groove to one or both of the side walls. This configuration is illustrated in Figure 8B.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)

Abstract

La présente invention décrit un joint de tuyau entre une section de goupille (30) et une section de boîte (40). L’extrémité des sections de goupille (30) et de boîte (40) présentent des parties filetées complémentaires (32, 42) adaptées pour entrer mutuellement en prise le long de la majorité de leur longueur axiale, les filets (32, 42) étant inclinés dans la même direction et à un angle aigu par rapport à l’axe longitudinal du joint. La section de boîte (40) s’étend au moins jusqu’à un épaulement de butée (44) ayant une partie de tête tronconique qui est positionnée à côté d’un évidement complémentaire d’épaulement de butée (36) sur la section de goupille (30). Afin de recevoir la partie de tête tronconique de manière étanche, l’évidement complémentaire d’épaulement de butée (36) comprend un récepteur de cône ayant une section transversale conique. Une rainure annulaire (45) intermédiaire à la partie filetée (44) de la section de boîte (40) est incluse.
PCT/GB2005/004625 2004-12-06 2005-12-02 Raccord ameliore de tuyau WO2006061577A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
MX2007006784A MX2007006784A (es) 2004-12-06 2005-12-02 Union de tubos mejorada.
EP05811593A EP1828658A1 (fr) 2004-12-06 2005-12-02 Raccord ameliore de tuyau

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB0426628A GB0426628D0 (en) 2004-12-06 2004-12-06 Improved pipe joint
GB0426628.4 2004-12-06
GB0428350.3 2004-12-24
GB0428350A GB0428350D0 (en) 2004-12-24 2004-12-24 Improved pipe connection
GB0520476.3 2005-10-08
GB0520476A GB0520476D0 (en) 2005-10-08 2005-10-08 Improved pipe connection

Publications (1)

Publication Number Publication Date
WO2006061577A1 true WO2006061577A1 (fr) 2006-06-15

Family

ID=35788023

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/004625 WO2006061577A1 (fr) 2004-12-06 2005-12-02 Raccord ameliore de tuyau

Country Status (4)

Country Link
EP (1) EP1828658A1 (fr)
AR (1) AR051787A1 (fr)
MX (1) MX2007006784A (fr)
WO (1) WO2006061577A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101864906A (zh) * 2010-07-09 2010-10-20 天津钢管集团股份有限公司 抗弯曲的油套管螺纹连接结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1030029A1 (fr) * 1999-02-19 2000-08-23 ENI S.p.A. Joint intégral pour raccorder deux tuyaux
US6442826B1 (en) * 2000-05-23 2002-09-03 Hunting Oilfield Services, Inc. Method for manufacturing a flush/semi-flush threaded connection
US20040036286A1 (en) * 2000-08-09 2004-02-26 Giuseppe Della Pina Screw threaded joint for continous-profile tubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1030029A1 (fr) * 1999-02-19 2000-08-23 ENI S.p.A. Joint intégral pour raccorder deux tuyaux
US6442826B1 (en) * 2000-05-23 2002-09-03 Hunting Oilfield Services, Inc. Method for manufacturing a flush/semi-flush threaded connection
US20040036286A1 (en) * 2000-08-09 2004-02-26 Giuseppe Della Pina Screw threaded joint for continous-profile tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101864906A (zh) * 2010-07-09 2010-10-20 天津钢管集团股份有限公司 抗弯曲的油套管螺纹连接结构

Also Published As

Publication number Publication date
EP1828658A1 (fr) 2007-09-05
AR051787A1 (es) 2007-02-07
MX2007006784A (es) 2008-01-28

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