CA2547056A1 - Improvement of resistance to fatigue of a threaded tubular connection - Google Patents

Improvement of resistance to fatigue of a threaded tubular connection Download PDF

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Publication number
CA2547056A1
CA2547056A1 CA002547056A CA2547056A CA2547056A1 CA 2547056 A1 CA2547056 A1 CA 2547056A1 CA 002547056 A CA002547056 A CA 002547056A CA 2547056 A CA2547056 A CA 2547056A CA 2547056 A1 CA2547056 A1 CA 2547056A1
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CA
Canada
Prior art keywords
male
threading
threadings
female
load transfer
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002547056A
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French (fr)
Other versions
CA2547056C (en
Inventor
Gabriel Roussie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vallourec Oil and Gas France SAS
Nippon Steel Corp
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Individual
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Filing date
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Application filed by Individual filed Critical Individual
Publication of CA2547056A1 publication Critical patent/CA2547056A1/en
Application granted granted Critical
Publication of CA2547056C publication Critical patent/CA2547056C/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/002—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with more then one threaded section

Abstract

Radial interference between the male (3b) and female (4b) threadings operates between stabbing flanks (31, 36) inclined at about 27~ with respect to the axis of the threadings, wherein the mutual contacting surfaces are radially spaced from the root of the male threading (32), which is defined by a concave rounded portion. Thus micro~-cracks caused by friction between these surfaces during relative movements of the male and female threaded elements are not affected by tensile stresses moving along the, envelope (E) of the male thread root (32), improving the fatigue resistance of the connection. Application to hydrocarbon wells connected to offshore platforms.

Claims (29)

1. A method to improve the fatigue resistance of a threaded tubular connection subjected to stress variations, said connection comprising a male tubu-lar element (1) including a tapered male threading (3), and a female tubular element (2) including a tapered female threading (4) which cooperates with the male threading (3) by makeup to produce a rigid mutual connection of said tubular elements with ra-dial interference between radial load transfer zones (15) of said threadings, characterized in that the threadings each have a load flank (10, 5) extending substantially perpendicularly to the axis of the threadings, and in that said radial load transfer zones (15) are at a radial distance from the enve-lopes (E) of the thread roots of the male and female threadings and form an angle of less than 40° with the axis of the threadi ngs.
2. A method according to claim 1, in which said radial load transfer zones are constituted by i) the crest of at least one helical protuberance formed on the thread root of at least one threading with respect to the envelope of the thread root and ii) the fac-ing zone located on the thread crest of the corre-sponding threading.
3. A method according to claim 2, in which the protu-berance or protuberances is/are disposed on the male thread root.
4. A method according to claim 2 or claim 3, in which the crest of the protuberances is convexly domed.
5. A method according to one of claims 2 to 4, in which the protuberances are connected to the thread root via one or more concave rounded portions.
6. A method according to one of claims 2 to 5, in which said protuberances are each constituted by a crest (15) of a helical rib (14) formed on the thread root (13) of the threading (3) under consideration.
7. A method according to claim 6, in which said radial load transfer zones comprise the crests (15) of at least two helical ribs (14) which are in axial suc-cession along the thread root (13) of the male threading (3).
8. A method according to one of claims 2 to 7, in which said facing zones located on the thread crest of the corresponding threading each have a recessed helix partially enveloping each protuberance.
9. A method according to one of claims 2 to 8, in which the height of said protuberances with respect to the thread root is in the range from about 0.2 to about 0.4 mm.
10. A method according to claim 1, in which said radial load transfer zones comprise the crest of a boss ex-tending from the foot of the load flank to the foot of the stabbing flank on the thread root of the threading under consideration.
11. A method according to claim 1, in which said radial load transfer zones comprise the crest of a boss bearing on one of the flanks of the threading under consideration.
12. A method according to claim 1, in which said radial load transfer zones are constituted by respective intermediate regions (22, 26) of the stabbing flanks of the male and female threadings (3a, 3b), said in-termediate regions forming a smaller angle with the axis of the threadings than the neighbouring regions (20, 21, 24, 25) of said flanks.
13. A method according to claim 12, in which the angle between said intermediate regions and the axis of the threadings is sub stantially zero.
14. A method according to claim 1, in which said radial load transfer zones are ramps (31, 36) constituting the stabbing flanks of the male and female thread-ings (3b, 4b) over the major portion of the radial height thereof.
15. A method according to claim 14, in which the angle between said ramps and the axis of the threadings is in the range 20° to 40°.
16. A method according to claim 14, in which the angle between said ramps and the axis of the threadings is about 27°.
17. A method according to one of claims 14 to 16, in which the profile of the male threading comprises a first concave rounded portion (32) defining the thread root and tangential to said ramp.
18. A method according to claim 17, in which the profile of the male threading comprises a second concave rounded portion (33) with a smaller radius of curva-ture than the first (32) rounded portion and tangen-tial thereto and to the load flank.
19. A method according to one of claims 14 to 18, in which a groove defining the female thread root ex-tends axially from a first wall constituted by the load flank (5) to a second wall (37) which is con-nected to the ramp (36) of the female threading.
20. A method according to claim 19, in which the profile of said groove comprises a central concave rounded portion (39) framed by first and second rounded con-cave portions (40, 38) respectively tangential to said first and second walls (5, 37) and with a smaller radius of curvature than the central rounded portion.
21. A method according to claim 19 or claim 20, in which the profile of the female threading comprises a con-vex rounded portion (37) tangential to a second rounded portion (38) and to said ramp (36), the zone of inflexion between the convex rounded portion and the second rounded portion constituting the second wall.
22. A method according to on a of the preceding claims, in which said radial load transfer zones (15) are provided in a zone of full height threads or of threads termed perfect threads .
23. A method according to claim 22, in which said radial load transfer zones (15) are also provided in a zone of imperfect threads, in particular in a zone of run-out threads.
24. A threaded tubular connection for implementing the method according to one of claims 2 to 9 comprising a male tubular element (1) including a tapered male threading (3), and a female tubular element (2) in-cluding a tapered female threading (4) which cooper-ates with the male threading (3) by makeup to pro-duce a rigid mutual connection of said tubular ele-ments with radial interference between radial load transfer zones (15) of said threadings, in which said radial load transfer zones are constituted by i) the crest of at least a helical protuberance formed on the thread root of at least a threading with respect to the envelope of the thread root and ii) the facing zone of the thread crest of the cor-responding threading.
25. A threaded tubular connection for implementing the method according to claim 10, comprising a male tu-bular element (1) including a tapered male threading (3), and a female tubular element (2) including a tapered female threading (4) which cooperates with the male threading (3) by makeup to produce a rigid mutual connection of said tubular elements with ra-dial interference between radial load transfer zones (15) of said threadings, in which said radial load transfer zones comprise the crest of a boss extend-ing from the foot of the load flank to the foot of the stabbing flank on the thread root of the thread-ing under consideration.
26. A threaded tubular connection for implementing the method according to claim 11, comprising a male tu-bular element (1) including a tapered male threading (3), and a female tubular element (2) including a tapered female threading (4) which cooperates with the male threading (3) by makeup to produce a rigid mutual connection of said tubular elements with ra-dial interference between radial load transfer zones (15) of said threadings, in which said radial load transfer zones comprise the crest of a boss bearing on one of the flanks of the threading under consid-eration.
27. A threaded tubular connection for implementing the method according to claim 12 or claim 13, comprising a male tubular element (1) including a tapered male threading (3), and a female tubular element (2) in-cluding a tape red female threading (4) which cooper-ates with the male threading (3) by makeup to pro-duce a rigid mutual connection of said tubular ele-ments with radial interference between radial load transfer zones (15) of said threadings, in which said radial load transfer zones are constituted by respective intermediate regions (22, 26) of the stabbing flanks of the male and female threadings (3a, 3b), said intermediate regions forming a smaller angle with the axis of the threadings than the neighbouring regions (20, 21, 24, 25) of said flanks.
28. A threaded tubular connection for implementing the method according to claim 17 or claim 18, comprising a male tubular element (1) including a tapered male threading (3), and a female tubular element (2) in-cluding a tapered female threading (4) which cooper-ates with the male threading (3) by makeup to pro-duce a rigid mutual connection of said tubular ele-ments with radial interference between radial load transfer zones (15) of said threadings, in which said radial load transfer zones are ramps (31, 36) constituting the stabbing flanks of the male and fe-male threadings (3b, 4b) over the major portion of the radial height thereof, and the profile of the male threading comprises a first concave rounded portion (32) defining the thread root and tangential to said ramp.
29. A threaded tubular connection for implementing the method according to one of claims 19 to 21, compris-ing a male tubular element (1) including a tapered male threading (3), and a female tubular element (2) including a tapered female threading (4) which coop-erates with the male threading (3) by makeup to pro-duce a rigid mutual connection of said tubular ele-ments with radial interference between radial load transfer zones (15) of said threadings, in which said radial load transfer zones are ramps (31, 36) constituting the stabbing flanks of the male and fe-male threadings (3b, 4b) over the major portion of the radial height thereof and a groove defining the female thread root extends axially from a first wall constituted by the load flank (5) to a second wall (37) which is connected to the ramp (36) of the fe-male threading.
CA2547056A 2003-12-11 2004-12-02 Improvement of resistance to fatigue of a threaded tubular connection Active CA2547056C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0314527 2003-12-11
FR0314527A FR2863681B1 (en) 2003-12-11 2003-12-11 FATIGUE-RESISTANT THREADED TUBULAR JOINT
PCT/EP2004/013743 WO2005059422A1 (en) 2003-12-11 2004-12-02 Improvement of resistance to fatigue of a threaded tubular connection

Publications (2)

Publication Number Publication Date
CA2547056A1 true CA2547056A1 (en) 2005-06-30
CA2547056C CA2547056C (en) 2011-05-17

Family

ID=34610577

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2547056A Active CA2547056C (en) 2003-12-11 2004-12-02 Improvement of resistance to fatigue of a threaded tubular connection

Country Status (13)

Country Link
US (2) US7845687B2 (en)
EP (1) EP1692424B1 (en)
JP (1) JP4898455B2 (en)
CN (1) CN100478599C (en)
AR (1) AR047630A1 (en)
AT (1) ATE425400T1 (en)
BR (1) BRPI0416737B1 (en)
CA (1) CA2547056C (en)
DE (1) DE602004019966D1 (en)
FR (1) FR2863681B1 (en)
PL (1) PL1692424T3 (en)
RU (1) RU2341716C2 (en)
WO (1) WO2005059422A1 (en)

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Also Published As

Publication number Publication date
RU2006124735A (en) 2008-01-20
DE602004019966D1 (en) 2009-04-23
US8146959B2 (en) 2012-04-03
FR2863681A1 (en) 2005-06-17
JP2007514109A (en) 2007-05-31
AR047630A1 (en) 2006-02-01
RU2341716C2 (en) 2008-12-20
US20080012321A1 (en) 2008-01-17
CN100478599C (en) 2009-04-15
EP1692424B1 (en) 2009-03-11
WO2005059422A1 (en) 2005-06-30
BRPI0416737B1 (en) 2018-05-22
CA2547056C (en) 2011-05-17
ATE425400T1 (en) 2009-03-15
JP4898455B2 (en) 2012-03-14
US7845687B2 (en) 2010-12-07
EP1692424A1 (en) 2006-08-23
US20110037255A1 (en) 2011-02-17
CN1890499A (en) 2007-01-03
BRPI0416737A (en) 2007-01-16
PL1692424T3 (en) 2009-08-31
FR2863681B1 (en) 2006-02-24

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