USRE34467E - Tubular connection - Google Patents
Tubular connection Download PDFInfo
- Publication number
- USRE34467E USRE34467E US07/869,812 US86981292A USRE34467E US RE34467 E USRE34467 E US RE34467E US 86981292 A US86981292 A US 86981292A US RE34467 E USRE34467 E US RE34467E
- Authority
- US
- United States
- Prior art keywords
- threads
- flanks
- box
- connection
- crests
- 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.)
- Expired - Lifetime
Links
Images
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
-
- 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0423—Threaded with plural threaded sections, e.g. with two-step threads
-
- 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
-
- 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
- F16L15/003—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with sealing rings
Definitions
- a tubular connection having a unique thread form or structure that provides an unusually strong connection while controlling the stress and strain in the connected pin and box members within acceptable levels.
- the mating helical threads are tapered in thread width in opposite directions to provide a substantially simultaneous wedge-like engagement of the opposing flanks to limit rotational make-up of the connection.
- the value of the thread width as well as the value of the flank shoulder angles are two of the variables that may be used to control the stress and strain induced in the pin and box for a given make-up torque.
- liquid and paste-like thread lubricants have been temporarily trapped in the helical clearance between the roots and crests of the threads.
- the trapped fluid may, under certain circumstances give a false indication that the connection is properly made up.
- the temporarily trapped thread lubricant or thread dope can bleed off through the helical clearance between the roots and crests reducing the preload stress and strain so that the anticipated performance level or strength of the threaded connection may not be achieved. While such reduction in the performance level is not properly attributable to a deficiency in the connection or its design, the consequence of improper make-up is an unacceptable performance level for the threaded connection.
- the present invention relates to an improvement for a thread structure to increase the probability or likelihood of proper make-up of the threaded connection.
- a thread structure having a tapered thread width and one or more dove-tail flanks exhibits superior mechanical strength.
- the threaded connection is limited only by the properties of the materials of construction used in making the connection. To achieve such a level of performance it is necessary to forceably make-up the connection to a predetermined torque value to insure that the design stress and strain preload conditions actually exist in the connection.
- the present invention reduces the volume of trapped thread lubricant and locates most of the trapped lubricant in the helical space between the load flanks that has a very small axial thickness and little or no effect on the proper make-up of the connection or the ability of the thread surfaces to form seals as thy move together.
- FIG. 1 is a side view, in section, of the prior art thread structure
- FIG. 2 is a side view, in section, of a prior art connection having the prior art thread structure
- FIG. 3 is a side view, partially in section, of a pin member having the thread structure of the present invention formed thereon;
- FIG. 4 is a side view, partially in section, of a threaded and coupled connection of the present invention.
- FIG. 5 is a side view, in section, of a tubular conduit having an external pin thread structure of the present invention formed thereon;
- FIG. 6 is a partial side view, in section, of a coupling having another form of the thread structure of the present invention formed internally thereon;
- FIG. 7 is a cross-sectional view on an enlarged scale of a pin and box having the dove-tail shaped threads used with the preferrerd embodiment of the invention.
- FIGS. Nos. 1 and 2
- FIGS. 2 and 6 correspond to FIGS. 2 and 6, respectively of Blose U.S. Pat. No. RE 30,647. That patent, along with all of the other patents mentioned or identified herein are incorporated by reference as if actually set forth herein. However, for background purposes in understanding the present invention a brief description of the Blose prior art construction is set forth hereinbelow.
- the Blose threaded connection or pipe joint includes a first or pin member 11 and a second or box member 12, respectively, with either one or both of the members defining the longitudinal axis 13 of the made-up connection 10.
- the box member 12 has an internal thread structure 14 formed thereon adapted to engage a complementary external thread structure 15 formed on the pin 11 for mechanically securing in a releasable manner the members 11 and 12.
- Helical threads 14 and 15 have a dove-tail interfit so that a first load flank wall 16 of the thread 14 engages with complementary load flank wall 17 formed on the thread 15.
- the opposite or stab flank wall 18 formed by the thread structure 14 engages the complementary stab flank wall 19 formed by the thread structure 15.
- load flank designates that side wall surface of a thread that faces away from the outer end of the respective male or female member on which the thread is formed
- stab flank designates that side wall surface that faces toward the outer end of the respective male or female member and supports the weight of the joint during the initial make up of the joint.
- An angle ⁇ is formed between the flank wall 18 and the root wall 20 of the thread 14. Likewise, the angle ⁇ is also formed between the stab flank wall 19 and the root wall 21 of the thread structure 15.
- the flank wall 16 and the root wall 20 as well as the flank wall 17 and the root wall 21 of the thread 15 form a second angle ⁇ .
- the angles ⁇ and ⁇ are preferably acute angles to provide dovetail shaped threads. However, it should be understood that a semi-dovetail form can be provided where one of the angles ⁇ and ⁇ can be ninety (90) degrees which would flank wall perpendicular or normal to the longitudinal axis 13 of the connection.
- clearances 22 and 23 are provided between the root walls 20 and 21 and the thread crests 24 and 25 of the threads 14 and 15, respectively in the hand tight position so that relatively wide helical spaces containing thread lubricant are present throughout the length of the threads.
- the helical thread 14 formed on the first or box member 12 has a greater thread width between the flanks 16 and 18 at the thread tip or crest 24 than at the base of the thread; likewise, helical thread 15 has a greater axial distance between flanks 17 and 19 at the thread crest 25 than at the base of the thread.
- each thread 14 and 15 has a progressively reducing thread width in opposite directions along the helical length thereof to provide a tapered wedge thread arranged such that flanks 16 and 18 of thread 14 engage load flanks 17 and 19 of thread 15 at substantially the same time when the threads are made up hand tight. Prior to that time, there is a gap between at least one of the flanks of threads 14 and 15.
- the maximum thread width of the tapered thread is no greater than twice the thread width at the narrowest point for a corresponding location on a flank.
- connection 10 illustrated in FIG. 2 is provided with a multiple or two step cylindrical thread having a stop shoulder 30 formed on the pin member 11 that engages a corresponding stop shoulder 32 on the box 12. Because the engaging flanks of threads 14 and 15 also serve as a make-up stop shoulder, it may be desired to provide a clearance gap between the shoulders 30 and 32.
- the connection 10 is also provided with the conventional conical metal-to-metal seal zone on the pin 11 at 34.
- a companion sealing surface 36 formed on the box 12 engages the pin sealing surface 34 to block passage of fluid therebetween.
- a plastic seal ring 38 such as disclosed in U.S. Pat. No. 3,100,656 to MacArthur, may be employed. Such plastic ring 38 is preferably used with internally lined pipe for providing a continuous corrosion-resistant surface.
- the threads are formed at a common radial distance or radius from the longitudinal axis 13 of the joint to provide a cylindrical rather than a tapered thread.
- the thread structures 14 and 15 are formed on a larger radius while the second step threads, referenced as 14a and 15a, are formed on a small radius or distance from the longitudinal axis 13 of the connection 10.
- the two step thread which may be cylindrical or tapered, is recognized for its speed of assembly during installation operations as is known in the art.
- a pin member 111 is provided with external helical thread structure 115 on upset end portion 111a of pin 111. It is to be understood however that the thread structure of the present invention is equally well suited for non-upset or plain end pipe.
- the tapered wedge-like thread structure 115 also has one or both of its flank 117 and 119 inclined outwardly at an acute angle so as to provide a generally dove-tail shape.
- the thread root 121 separates the oppositely facing flank shoulders 117 and 119 which are disposed adjacent thereto.
- the thread crests 125 are disposed at the outer ends of the flanks 117 and 119 and alternate with the thread roots 121 in the conventional manner.
- the thread width between the oppositely facing flank surfaces 117 and 119 below the thread crests 125 varies progressively at a uniform rate substantially the entire helical length of the thread 115. This provides a tapered wedge thread design in which the flanks 117 and 119 engage the corresponding fanks on the threads of the female member at substantially the same time upon rotational make-up of the threaded connection.
- the axial thread width decreases or varies progressively at a much greater rate from that illustrated in the embodiment of FIG. 2.
- the pin member 111 may be provided with an identical or different thread structure on the other end (not illustrated) in the conventional manner.
- the thread roots 121 and the thread crests 125 on the pin are dimensioned to eliminate the formation of the radial clearance illustrated at 22 and 23 in FIG. 1 and FIG. 2.
- thread roots 121 and thread crests 125 come into interference contact with the corresponding surfaces of the box, i.e., when the joint is made up hand tight.
- roots 120 and 121 and crests 124 and 125 of the threads are dimensioned to be in contact with each other upon hand tight make up and may, if desired to be dimensioned to provide a radial interference for inducing a controlled stress in the pin member 111 upon forceable make-up.
- the pin member 111 may also be provided with the conventional metal-to-metal seal area 111b for blocking leakage of fluid between the pin 111 and the box member when the connection is made up in the usual manner.
- FIG. 4 illustrates the pin 111 of FIG. 3 made up in a box member or coupling 112 to form a thread and coupled (T & C) connection 110.
- the coupling 112 is provided with the internal or box complementary thread structure 114 for making up with the pin in the usual manner.
- the thread roots 120 and 121 coact with the thread crests 124 and 125 to prevent formation of undesired radial clearance that may traps thread lubricant during assembly in the manner described above.
- the upper portion of the coupling 112 is illustrated with an identical thread structure facing in the opposite direction for connecting with a tube, pipe or conduit disposed adjacent to and above the coupling 112 in the usual manner. If desired a different thread structure may be provided in the upper portion of the coupling 112 without departing from the scope of the present invention.
- FIGS. 5 and 6 a two step conical or tapered (i.e., varying thread diameter) thread construction is illustrated rather than a cylindrical two step thread such as disclosed in FIG. 2.
- the pin 211 has an external helical thread structure 215 formed in accordance with the present invention while the coupling 212 is provided with two internal helical thread structures 214 facing in opposite directions for coupling with adjacent tubes in the conventional manner.
- FIG. 6 it is again to be understood that a different thread profile or structure may be provided at one end of the coupling or box member 212.
- Disposed substantially equi-distant from the outer ends of the coupling 212 is an inwardly projecting collar 260 forming a downwardly facing annular shoulder 262 and an upwardly facing shoulder 264.
- the end surface 261 of pin 211 is not brought in contact with the downwardly facing shoulder 262 of the flange 260.
- the flange 260 serves to provide a substantially turbulent-free flow path to minimize the effects of flow erosion on the coupling 212.
- the sealing area 240 of the coupling 212 is located intermediate of the two steps of tapered threads.
- the sealing area 240 of the coupling engages the seal area 242 formed on the pin 211 intermediate the two spaced thread steps to form an additional metal-to-metal seal to block leakage of fluid between the coupling 212 and the pin 211 in a conventional manner. While an intermediate seal is illustrated it should be understood that other seal locations and types of seal are equally well suited for use with the present invention.
Abstract
Description
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/869,812 USRE34467E (en) | 1983-04-29 | 1992-04-16 | Tubular connection |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US48973983A | 1983-04-29 | 1983-04-29 | |
US86888786A | 1986-05-27 | 1986-05-27 | |
US07/240,679 US4917409A (en) | 1983-04-29 | 1988-09-06 | Tubular connection |
US07/869,812 USRE34467E (en) | 1983-04-29 | 1992-04-16 | Tubular connection |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US86888786A Continuation | 1983-04-29 | 1986-05-27 | |
US07/240,679 Reissue US4917409A (en) | 1983-04-29 | 1988-09-06 | Tubular connection |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE34467E true USRE34467E (en) | 1993-12-07 |
Family
ID=27500023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/869,812 Expired - Lifetime USRE34467E (en) | 1983-04-29 | 1992-04-16 | Tubular connection |
Country Status (1)
Country | Link |
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US (1) | USRE34467E (en) |
Cited By (80)
Publication number | Priority date | Publication date | Assignee | Title |
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US5454605A (en) * | 1993-06-15 | 1995-10-03 | Hydril Company | Tool joint connection with interlocking wedge threads |
US5609440A (en) * | 1995-06-16 | 1997-03-11 | Hydril Company | Apparatus and method for arresting the propagation of a buckle in a pipeline |
WO1998053177A1 (en) | 1997-05-20 | 1998-11-26 | Hydril Company | Stress reduction groove for tubular connection |
US6009611A (en) | 1998-09-24 | 2000-01-04 | Oil & Gas Rental Services, Inc. | Method for detecting wear at connections between pin and box joints |
FR2781863A1 (en) | 1998-07-30 | 2000-02-04 | Hydril Co | TUBULAR JOINT WEAR INDICATOR |
EP1046779A1 (en) | 1999-04-19 | 2000-10-25 | Hydril Company | Threaded pipe connection |
US6174001B1 (en) * | 1998-03-19 | 2001-01-16 | Hydril Company | Two-step, low torque wedge thread for tubular connector |
WO2001029475A1 (en) * | 1999-10-20 | 2001-04-26 | Beverly Watts Ramos | Open type wedgethread connection |
EP1106778A1 (en) | 1999-12-09 | 2001-06-13 | Hydril Company | Seal for expandable tubular connections |
US6254146B1 (en) | 1999-04-23 | 2001-07-03 | John Gandy Corporation | Thread form with multifacited flanks |
US6283477B1 (en) * | 1993-03-24 | 2001-09-04 | Baker Hughes Incorporated | Annular chamber seal |
EP1179700A3 (en) * | 2000-08-10 | 2002-02-20 | Hydril Company | Double flex seal for tubular connection |
WO2002075197A1 (en) * | 2001-03-19 | 2002-09-26 | Grant Prideco, L.P. | Threaded connection |
US6607220B2 (en) | 2001-10-09 | 2003-08-19 | Hydril Company | Radially expandable tubular connection |
WO2003076837A2 (en) * | 2002-03-06 | 2003-09-18 | Ramos, Beverly, Watts | Wedgethread pipe connection |
US20040017081A1 (en) * | 2002-07-06 | 2004-01-29 | Simpson Neil Andrew Abercrombie | Coupling tubulars |
US20040100098A1 (en) * | 2002-11-21 | 2004-05-27 | Church Kris L. | Hang-free thread design |
US6817633B2 (en) | 2002-12-20 | 2004-11-16 | Lone Star Steel Company | Tubular members and threaded connections for casing drilling and method |
WO2004106797A1 (en) | 2003-05-30 | 2004-12-09 | Vallourec Mannesmann Oil & Gas France | Threaded tubular connection with progressive axial thread interference |
US20050242583A1 (en) * | 2004-04-30 | 2005-11-03 | Gb Tubulars, Inc. | Coupling for drilling-with-casing operations |
US20060087119A1 (en) * | 2004-10-26 | 2006-04-27 | Sivley Robert S Iv | Expandable threaded connection |
US20060145476A1 (en) * | 2004-12-30 | 2006-07-06 | Reynolds Harris A Jr | Pseudo two-step connection |
US20060145480A1 (en) * | 2004-12-30 | 2006-07-06 | Hydril Company | Floating wedge thread for tubular connection |
US20060145477A1 (en) * | 2004-12-30 | 2006-07-06 | Reynolds Harris A Jr | Threads with perturbations |
US20060201669A1 (en) * | 2004-11-05 | 2006-09-14 | Sivley Robert S | Dope relief method for wedge thread connections |
US7156676B2 (en) | 2004-11-10 | 2007-01-02 | Hydril Company Lp | Electrical contractors embedded in threaded connections |
US7169239B2 (en) | 2003-05-16 | 2007-01-30 | Lone Star Steel Company, L.P. | Solid expandable tubular members formed from very low carbon steel and method |
US20070024053A1 (en) * | 2005-07-28 | 2007-02-01 | Sivley Robert S Iv | Mid-seal for expandable connections |
US20070048108A1 (en) * | 2005-08-30 | 2007-03-01 | Reynolds Harris A Jr | Electrically insulated wedge thread connection |
US20070132237A1 (en) * | 2004-10-05 | 2007-06-14 | Hydril Company Lp | Helical groove for a tubular connection |
US20070158943A1 (en) * | 2004-12-30 | 2007-07-12 | Hydril Company Lp | Threaded connection with perturbed flanks |
US20070167051A1 (en) * | 2004-11-10 | 2007-07-19 | Reynolds Harris A Jr | Data communications embedded in threaded connections |
US20070170722A1 (en) * | 2006-01-24 | 2007-07-26 | Reynolds Harris A Jr | Wedge thread with sealing metal |
US20070176423A1 (en) * | 2006-01-24 | 2007-08-02 | Reynolds Harris A Jr | Dope free volume for wedge-threaded connections |
US20070228730A1 (en) * | 2006-03-30 | 2007-10-04 | Sivley Robert S Iv | Threaded connection with variable flank angles |
US20070233263A1 (en) * | 2006-03-31 | 2007-10-04 | Sdgi Holdings, Inc. | Intervertebral implants with radial teeth and methods of use |
US20070236014A1 (en) * | 2006-03-30 | 2007-10-11 | Reynolds Harris A Jr | Mismatched flanks for a wedge thread |
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WO2008140645A1 (en) | 2007-05-09 | 2008-11-20 | Gandy Technologies Corporation | Thread form for tubular connections |
US7575255B2 (en) | 2004-12-30 | 2009-08-18 | Hydril Llc | Wedge thread with high-angle metal seal |
US7665532B2 (en) | 1998-12-07 | 2010-02-23 | Shell Oil Company | Pipeline |
US7712522B2 (en) | 2003-09-05 | 2010-05-11 | Enventure Global Technology, Llc | Expansion cone and system |
US7717478B2 (en) | 2006-08-29 | 2010-05-18 | Hydril Llc | Scalloped wedge threads |
US20100123311A1 (en) * | 2008-11-17 | 2010-05-20 | Church Kris L | Cylindrical Tapered Thread Form for Tubular Connections |
US7739917B2 (en) | 2002-09-20 | 2010-06-22 | Enventure Global Technology, Llc | Pipe formability evaluation for expandable tubulars |
US7740076B2 (en) | 2002-04-12 | 2010-06-22 | Enventure Global Technology, L.L.C. | Protective sleeve for threaded connections for expandable liner hanger |
US20100171305A1 (en) * | 2003-05-30 | 2010-07-08 | Vallourec Mannesmann Oil & Gas France | Threaded tubular connection which is resistant to bending stresses |
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US7819185B2 (en) | 2004-08-13 | 2010-10-26 | Enventure Global Technology, Llc | Expandable tubular |
WO2010133299A1 (en) * | 2009-05-20 | 2010-11-25 | Vallourec Mannesmann Oil & Gas France | Threated connection for drilling and operating hydrocarbon wells |
US7886831B2 (en) | 2003-01-22 | 2011-02-15 | Enventure Global Technology, L.L.C. | Apparatus for radially expanding and plastically deforming a tubular member |
US7918284B2 (en) | 2002-04-15 | 2011-04-05 | Enventure Global Technology, L.L.C. | Protective sleeve for threaded connections for expandable liner hanger |
US20110084477A1 (en) * | 2009-10-13 | 2011-04-14 | Hydril Company | Wedge threads with a solid lubricant coating |
US20110084483A1 (en) * | 2009-10-09 | 2011-04-14 | Tenaris Connections Ag | Tubular joint having wedge threads with surface coating |
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