USRE34467E - Tubular connection - Google Patents

Tubular connection Download PDF

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Publication number
USRE34467E
USRE34467E US07869812 US86981292A USRE34467E US RE34467 E USRE34467 E US RE34467E US 07869812 US07869812 US 07869812 US 86981292 A US86981292 A US 86981292A US RE34467 E USRE34467 E US RE34467E
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Prior art keywords
thread
threads
flanks
connection
up
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Expired - Lifetime
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US07869812
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Doyle E. Reeves
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Hydril LLC
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Hydril LLC
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods ; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042Couplings; joints between rod or the like and bit or between rod and rod or the like threaded
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods ; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042Couplings; joints between rod or the like and bit or between rod and rod or the like threaded
    • E21B17/0423Couplings; joints between rod or the like and bit or between rod and rod or the like threaded with plural threaded sections, e.g. with two-step threads
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/002Screw-threaded joints; Forms of screw-threads for such joints with conical threads with more then one threaded section
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/003Screw-threaded joints; Forms of screw-threads for such joints with conical threads with sealing rings

Abstract

An improved threaded connection adapted to secure adjacent conduits in a continuous flow conduit forming relationship. The threaded connection employs a tapered or wedge shaped thread with angled or tapered thread load flanks to obtain superior mechanical strength by controlling stress levels in the connection. To insure proper make-up of the connection the dimension of the thread structure is controlled to prevent trapping of thread lubricant during rotational make-up which may produce false torque make-up values.

Description

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention, which is a continuation of application Ser. No. 868,887, filed May 27, 1986, entitled "IMPROVED TUBULAR CONNECTION", which is a continuation of Ser. No. 489,739, filed Apr. 29, 1983, .Iadd.both .Iaddend.now abandoned, entitled "TUBULAR CONNECTION", relates generally to the field of tubular connections and more specifically to the field of threaded connections for securing flow conduits to form a desired continuous flow path.

2. Background Art

The use of threaded connections for joining flow conduits in an end-to-end relationship to form a continuous flow path or channel for transporting fluid under pressure is well known. The use of threaded connections in the production of hydrocarbons and other forms of energy from subsurface earth formations is particularly well known. Drill pipe, well casing and production tubing, commonly known collectively as oilfield tubular goods, all utilize threaded connections for connecting adjacent conduit sections or pipe joints. Examples of such threaded end connections for use on oilfield tubular goods are disclosed in Stone et al. Pat. No. 2,239,942; MacArthur Pat. No. 2,992,019; and Knox et al. Pat. No. 3,359,013, which were all assigned to the assignee of the present invention.

In Blose Pat. No. RE 30,647, also assigned to the assignee of the present invention, there is disclosed 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.

When making up a threaded connection manufactured in accordance with the disclosure of the Blose reissue patent, 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. Thereafter, 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.

SUMMARY OF THE INVENTION

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. When properly made up a thread structure having a tapered thread width and one or more dove-tail flanks exhibits superior mechanical strength. By tailoring the thread structure to a particular application or use, 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.

Frequently, oilfield tubular goods must be assembled or made up under extremely adverse conditions. In addition, the threaded connections may experience deterioration or damage in handling and transportation to the well site where they are to be used. In addition to these general factors, the particular thread structure disclosed in Blose Pat. No. RE 30,647 has exhibited some tendency to trap liquid or paste-like thread lubricants in the radial clearance areas between the thread roots and crests and prevent the desired normal force to be developed between the thread flanks even though the proper torque is applied to the connection. Unless the connection is properly tightened to a described level, the performance of the threaded connection will be significantly reduced. While the lubricant can and will be extruded from the trapping areas if the torque is maintained on the connection for a sufficient period of time, the personnel running or installing the oilfield conduits cannot be certain that torquing had been properly accomplished.

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.

BRIEF DESCRIPTION OF THE DRAWINGS

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; and

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.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT

The prior art FIGS. (Nos. 1 and 2), 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, generally designated 10, 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. As illustrated in FIG. 2, 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. As used herein, and as conventionally understood where pipe joints are being connected in a vertical position, such as when making up a pipe string for lowering into a well bore, the term "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, and the term "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 α is formed between the flank wall 18 and the root wall 20 of the thread 14. Likewise, the angle α 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 β. The angles α and β 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 α and β can be ninety (90) degrees which would flank wall perpendicular or normal to the longitudinal axis 13 of the connection. In the disclosure of the Blose reissue Pat No. 30,647, 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. As will be noted in FIG. 2, 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. Further, 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. In the embodiment illustrated from the Blose reissue patent, 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.

The 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. In the illustrated embodiment of FIG. 2 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.

In the embodiment illustrated in FIG. 2, 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.

In the embodiment of the present invention illustrated in FIG. 3 and in FIG. 7 like reference characters, increased by 100, have been used to designate like parts to simplify and shorten the written description. 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. In viewing the lower portion of FIG. 3 it will be immediately appreciated that the axial thread width decreases or varies progressively at a much greater rate from that illustrated in the embodiment of FIG. 2. In particular, it has been found desirable to increase the axial thread width at the widest portion in the range of approximately four times the thread width at the narrowest portion. This contrasts with the embodiment illustrated in FIG. 2 where the thread width at the widest portion is only twice the thread width at the narrowest portion. The pin member 111 may be provided with an identical or different thread structure on the other end (not illustrated) in the conventional manner.

In the present invention, 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. In other words, 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. By eliminating the radial clearance between the thread roots 120 and 121 and crests 124 and 125 with the complementary thread structure, the possibility of creating chambers therebetween upon hand tight connection make-up that can virtually entrap the liquid or paste-like thread lubricant theein and create high squeeze film pressures which produce false torque readings is greatly minimized if nsot entirely reduced. In order to achieve this result the 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. When assembled in the manner illustrated 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.

In the embodiment of 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. In 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. Because the tapered or wedge configuration of the threads 214 and 215 provide stop shoulders to limit rotational make-up of the coupling 212 on the pin 211, the end surface 261 of pin 211 is not brought in contact with the downwardly facing shoulder 262 of the flange 260. However, 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.

The foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the size, shape and materials, as well as in the details of the illustrated construction, may be made without departing from the spirit of the invention.

Claims (10)

What is claimed is:
1. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, .[.exteranl.]. .Iadd.external.Iaddend., generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a pipe connection, a pipe thread lubricant coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin so the roots, crests, and flanks of the threads move together and form seals that resist the flow of fluids between the threads with .[.the stab flanks and.]. the roots and crests being designed to move into .[.sealing.]. engagement before both the load flanks and the stab flanks move into .[.sealing.]. engagement .[.after which the flanks will move together and form seals.]. to complete the sealing of the connection as the connection is fully made up.
2. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads and a pin having tapered, external, generally dovetail-shaped threads that mate with the threads on the box when the connection is made up, a pipe thread lubricant coating the threads, said threads on the box and pin having stab flanks that are in engagement as the pin moves into the box due to relative rotation of the pin and box, roots and crests that move into engagement .[.when the connection is made up hand-tight.]. .Iadd.during rotational make-up.Iaddend., and load flanks that move into engagement .[.when the connection is fully made up.]. .Iadd.upon rotational make-up of the threaded connection.Iaddend..
3. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks, and flat roots and crests that are parallel to the longitudinal axis of the pipe, and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks, and flat roots and .[.rests.]. .Iadd.crests .Iaddend.that are parallel to the longitudinal axis of the pipe, for mating with the internal threads of the box .[.tomade.]. .Iadd.to make .Iaddend.up a threaded pipe connection, said threads increasing in width in one direction on the box and in the other direction on the pin so that .[.the stab flanks.]., the roots and crests .Iadd.move into engagement during rotational makeup .Iaddend.and the .[.load.]. flanks of the threads .[.mave.]. .Iadd.move .Iaddend.together .[.sequentially as.]. .Iadd.when .Iaddend.the connection is .Iadd.fully .Iaddend.made up, said roots and crests having sufficient width to prevent any permanent deformation of the threads .[.adjacent the roots and crests when the connection is made up.]..
4. In a threaded pipe connection including a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dove-tail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a threaded pipe connection, said threads increasing in width in one direction on the box and in the other direction on the pin, and with at least the threads on one of the box and pin being coated with thread lubricant prior to make up the improvement to prevent the trapping of thread lubricant between the roots and crests causing an indication that the connector is made up before it is .[.,the improvement.]. comprising .[.,.]. the stab flanks and the roots and crests being designed to move into engagement when the pin and box are made up hand-tight .Iadd.during rotational make-up of the connection .Iaddend.after which continued make up of the connection moves .[.the stab flanks, the roots and crests, and.]. the load flanks into .[.sealing.]. engagement .[.when.]. .Iadd.upon rotational make-up of .Iaddend.the connection .[.is fully made up.].. .[.5. In a threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dove-tail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a threaded pipe connection, a pipe thread lubricant coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin the improvement comprising having the roots, crests, and flanks of the threads move together and form seals with the stab flanks moving together as the connection is being made up and the roots and crests being designed to move together when the pin and box are made up hand-tight after which continued make up of the connection moves the load flanks together completing the final make up of the connection thereby reducing substantially the volume of lubricant between
the roots and crests when the connection is made up.].. 6. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a pipe joint, a pipe thread lubricant coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin so the roots, crests, and flanks of the threads move together and form seals that resist the flow of fluids between the threads with .[.the stab flanks and.]. the roots and crests being designed to move into .[.sealing.]. engagement before both the load flanks and the stab flanks move into .[.sealing.]. engagement .[.after which the flanks will move together and form seals.]. to complete the sealing of the
connection as the connection is fully made up. 7. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads and a pin having tapered, external, generally dovetail-shaped threads that mate with the threads on the box when the connection is made up, a pipe thread lubricant coating the threads, said threads on the box and pin having stab flanks that are in engagement as the pin moves into the box due to relative rotation of the pin and box, roots and crests that move into engagement when the connection is made up hand-tight, and load flanks that move into engagement when the connection is fully made up, said roots and crests being flat wide surfaces so that, when engaged, the stress induced in the threads adjacent the .[.matin9.]. .Iadd.mating .Iaddend.surfaces does not exceed the yield of the thread material. .Iadd.8. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads and a pin having tapered, external, generally dovetail-shaped threads that mate with the threads on the box when the connection is made up, a pipe thread lubricant coating the threads, said threads on the box and pin having stab flanks that are in engagement initially as the pin moves into the box and roots and crests that move into engagement after the stab flanks but before the load flanks move into engagement when the connection is fully made up.
.Iaddend. .Iadd.9. In a threaded pipe connection including a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a threaded pipe connection, said threads increasing the width in one direction on the box and in the other direction on the pin, and with at least the threads on one of the box and pin being coated with thread lubricant prior to make up, the improvement to prevent the trapping of thread lubricant between the roots and crests causing an indication that the connector is made up before it is, the improvement comprising, the roots and crests being designed to move into engagement before both the stab flanks and the load flanks move into engagement as the connection is fully made up. .Iaddend. .Iadd.10. In a threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a threaded pipe connection, a pipe thread lubricant coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin the improvement comprising having the stab flanks and load flanks, but not both, in engagement at any one time before the roots and crests move into engagement during rotational make-up of the connection after which the other flanks move into engagement upon rotational make-up of the connection. .Iaddend. .Iadd.11. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a pipe connection, a pipe thread lubricant coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin so the roots, crests, and flanks of the threads move together and form seals that resist the flow of fluids between the threads with the roots and crests being designed to move into engagement during rotational make-up before both the load flanks and the stab flanks move into engagement when the connection is fully made up.
.Iaddend. .Iadd.12. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads and a pin having tapered, external, generally dovetail-shaped threads that mate with the threads on the box when the connection is made up, a pipe thread lubricant coating the threads, said dovetail-shaped threads on the box and pin providing stab flanks and load flanks only one set of which is in engagement at any given time as the pin moves into the box during rotational make-up of the pin and box and roots and crests that move into engagement during rotational make-up before the other set of flanks move into engagement upon rotational make-up of the connection. .Iaddend.
.Iadd.3. A threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks, and flat roots and crests that are parallel to the longitudinal axis of the pipe, and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks, and flat roots and crests that are parallel to the longitudinal axis of the pipe, for mating with the internal threads of the box to make up a threaded pipe connection, a pipe thread lubricant coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin whereupon during rotational make up one or the other of the flanks, but not both may be in engagement at any given time prior to engagement of the roots and crests during rotational make-up and the remaining unengaged flanks of the threads moving together after the engagement of the roots and crests upon rotational make-up of the
connection. .Iaddend. .Iadd.14. In a threaded pipe connection comprising a box having tapered, internal, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe and a pin having tapered, external, generally dovetail-shaped threads with stab flanks and load flanks and flat roots and crests that are parallel to the longitudinal axis of the pipe for mating with the internal threads of the box to make up a threaded pipe connection, a pipe thread lubricating coating the threads, said threads increasing in width in one direction on the box and in the other direction on the pin the improvement comprising having the roots, crests, and one of the flanks of the threads move together when the pin and box are made up hand-tight during rotational make-up of the connection after which continued rotational make-up of the connection moves the other flanks together upon rotational make-up of the connection thereby reducing substantially the volume of a lubricant between the roots and crests when the connection is made up. .Iaddend.
US07869812 1983-04-29 1992-04-16 Tubular connection Expired - Lifetime USRE34467E (en)

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US48973983 true 1983-04-29 1983-04-29
US86888786 true 1986-05-27 1986-05-27
US07240679 US4917409A (en) 1983-04-29 1988-09-06 Tubular connection
US07869812 USRE34467E (en) 1983-04-29 1992-04-16 Tubular connection

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WO1998053177A1 (en) 1997-05-20 1998-11-26 Hydril Company Stress reduction groove for tubular connection
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
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WO2012069154A1 (en) 2010-11-26 2012-05-31 Vallourec Mannesmann Oil & Gas France Method and device for inspecting a threading of a tubular connection used in the oil industry
WO2012089304A1 (en) 2010-12-29 2012-07-05 Vallourec Mannesmann Oil & Gas France Process for coating a threaded tubular component, threaded tubular component and resulting connection
WO2012089305A1 (en) 2010-12-28 2012-07-05 Vallourec Mannesmann Oil & Gas France Threaded connection for drilling and working hydrocarbon wells
US20120312550A1 (en) * 2009-12-23 2012-12-13 Sumitomo Metal Industries , Ltd. Set for obtaining a threaded connection, method for making up and breaking out said connection, and use of said connection in a riser
WO2013038072A1 (en) 2011-09-13 2013-03-21 Vallourec Mannesmann Oil & Gas France Assembly for producing a threaded joint for the drilling and operation of hydrocarbon wells, and resulting threaded joint
WO2013053450A1 (en) 2011-10-14 2013-04-18 Vallourec Mannesmann Oil & Gas France Threaded tubular component and resulting connection
WO2013098490A1 (en) 2011-12-29 2013-07-04 Vallourec Mannesmann Oil & Gas France Threaded tubular component and method for coating such a threaded tubular component
US8496274B2 (en) 2010-09-24 2013-07-30 Hydril Company Step-to-step wedge thread connections and related methods
WO2014041017A1 (en) 2012-09-12 2014-03-20 Vallourec Oil And Gas France Process for producing a dry polyamide-imide film with high galling resistance on a threaded tubular component from an aqueous dispersion which is free of carcinogenic substances
US9593786B1 (en) 2014-10-01 2017-03-14 Precision Couplings, Llc Leak proof threaded connector
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US6283477B1 (en) * 1993-03-24 2001-09-04 Baker Hughes Incorporated Annular chamber seal
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
US6270127B1 (en) * 1998-03-19 2001-08-07 Hydril Company Two-step, low torque wedge thread for tubular connector
US6174001B1 (en) * 1998-03-19 2001-01-16 Hydril Company Two-step, low torque wedge thread for tubular connector
FR2781863A1 (en) 1998-07-30 2000-02-04 Hydril Co tubular joint wear indicator
US7665532B2 (en) 1998-12-07 2010-02-23 Shell Oil Company Pipeline
EP1046779A1 (en) 1999-04-19 2000-10-25 Hydril Company Threaded pipe connection
US7988205B2 (en) 1999-04-19 2011-08-02 Hydril Company Wedge thread with torque shoulder
US6254146B1 (en) 1999-04-23 2001-07-03 John Gandy Corporation Thread form with multifacited flanks
US6578880B2 (en) * 1999-10-20 2003-06-17 Ramos, Beverly Watts Wedgethread pipe connection
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US6554287B1 (en) 1999-12-09 2003-04-29 Hydril Company Collapsing type seal for expandable tubular connections
EP1106778A1 (en) 1999-12-09 2001-06-13 Hydril Company Seal for expandable tubular connections
US6626471B2 (en) 2000-08-10 2003-09-30 Hydril Company Double flex seal for tubular connection
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US7918284B2 (en) 2002-04-15 2011-04-05 Enventure Global Technology, L.L.C. Protective sleeve for threaded connections for expandable liner hanger
US7578043B2 (en) 2002-07-06 2009-08-25 Weatherford/Lamb, Inc. Coupling tubulars
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US6817633B2 (en) 2002-12-20 2004-11-16 Lone Star Steel Company Tubular members and threaded connections for casing drilling and method
US7886831B2 (en) 2003-01-22 2011-02-15 Enventure Global Technology, L.L.C. Apparatus for radially expanding and plastically deforming a tubular member
US7621323B2 (en) 2003-05-16 2009-11-24 United States Steel Corporation Solid expandable tubular members formed from very low carbon steel and method
US7404438B2 (en) 2003-05-16 2008-07-29 United States Steel Corporation Solid expandable tubular members formed from very low carbon steel and method
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
US20100171305A1 (en) * 2003-05-30 2010-07-08 Vallourec Mannesmann Oil & Gas France Threaded tubular connection which is resistant to bending stresses
US20060261595A1 (en) * 2003-05-30 2006-11-23 Vallourec Mannesmann Oil & Gas France Threaded tubular connection with progressive axial thread interference
US7661728B2 (en) 2003-05-30 2010-02-16 Vallourec Mannesmann Oil & Gas France Threaded tubular connection with progressive axial thread interference
WO2004106797A1 (en) 2003-05-30 2004-12-09 Vallourec Mannesmann Oil & Gas France Threaded tubular connection with progressive axial thread interference
US8220842B2 (en) 2003-05-30 2012-07-17 Vallourec Mannesmann Oil & Gas France Threaded tubular connection which is resistant to bending stresses
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