WO2017041832A1 - Améliorations de procédés et d'appareil pour le raccordement de tubes - Google Patents

Améliorations de procédés et d'appareil pour le raccordement de tubes Download PDF

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Publication number
WO2017041832A1
WO2017041832A1 PCT/EP2015/070508 EP2015070508W WO2017041832A1 WO 2017041832 A1 WO2017041832 A1 WO 2017041832A1 EP 2015070508 W EP2015070508 W EP 2015070508W WO 2017041832 A1 WO2017041832 A1 WO 2017041832A1
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WO
WIPO (PCT)
Prior art keywords
tube
assembly
connector
tubular element
seal
Prior art date
Application number
PCT/EP2015/070508
Other languages
English (en)
Inventor
Christopher James BOWLES
Original Assignee
Bowles Christopher James
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
Application filed by Bowles Christopher James filed Critical Bowles Christopher James
Priority to PCT/EP2015/070508 priority Critical patent/WO2017041832A1/fr
Publication of WO2017041832A1 publication Critical patent/WO2017041832A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded

Definitions

  • the invention relates to a connection assembly for connecting tubes to other tubular elements such as tool connectors or other tubes, especially for use in the drilling industry, for example in the oil and gas industry. More particularly, the invention relates to the use of dimple connections and sealing arrangements on such connectors. The invention also relates to methods for joining a tube to other such tubular elements.
  • the tubes used are often so-called "coil tubing" usually made of steel, and that are stored as a coil of material that can be uncoiled for use.
  • a connector is required.
  • Two forms of connector are common: those that connect to the inside diameter of the tube (Inline Connectors) and those that connect to the outside diameter of the tube (Outline Connectors).
  • Inline connectors have the advantage that there is no increase in the outside diameter of the coil tubing by use of the connector, but with the disadvantage that the bore is restricted, leading to a smaller flow through the tube once the connector is in place.
  • Outline connectors have the advantage that they do not restrict the bore of the tube following connection, although the increased outside diameter of the assembly can restrict their use in some circumstances.
  • the present invention relates to improved methods and apparatus for forming such connections.
  • External and internal connectors are fixed on to the outside diameter and inside bore of the coil tubing at the end of the coil tubing reel and are used to attach and run (deploy) what is known in the industry as a Bottom Hole Assembly (BHA), which is a screwed-together combination of pressure-operated tools, such as: jarring subs, hammers, back pressure valves, and milling bits, (called a tool string).
  • BHA Bottom Hole Assembly
  • This is used to carry out live oil or gas well intervention work, e.g.
  • Grapple type involves sliding the connector's threaded compression nut/cap and the (surface hardened) tapered grapple spiral teeth slip over and up the tubing, followed by the bottom sub containing the ⁇ '-ring seals, which is tapped on to the end of the tubing until it passes the ⁇ '-ring seal area and bottoms out inside the housing.
  • the compression nut/cap is then slid down the tube over the grapple spiral teeth slip and is joined on to the bottom sub housing thread by manually tightening down the threaded compression nut/cap with a spanner or wrench while simultaneously holding the bottom sub housing from rotating by using a second spanner or wrench.
  • Grub- screw type installation involves cold forming indentations in the coil tubing using an existing manual dimple indentation tool. After the indentation tool is removed a Grub-screw connector is then aligned over the cold formed dimples, and grub-screws are screwed into the indentations, to secure the connector in place.
  • Internal Dimple type connectors installation involves cold forming indentations in to the coil tubing and directly into the already inserted and aligned internal dimple connector using manual or hydraulic installation tool, to secure the connector in place.
  • the grapple slip spiral teeth bites in to the coil tubing to provide tensile and torsion capabilities and prevent the grapple from being pulled from the tube or being rotated in the same direction as the spiral (necessary for rotating tools milling/drilling tools - these all typically rotate clockwise).
  • the Grub-screw type connector uses grub screws, which are tightened in to the cold formed
  • the Internal Dimple type connector after inserting into the coil tubing uses cold formed indentations in to the coil tubing, which are formed through into the dimples of the Internal Dimple type connector to achieve similar tensile and torsion capabilities of both the Grapple and Grub-screw type connectors.
  • the two o-ring elastomer seal arrangement housed inside the grapple connector's bottom sub housing or the grub-screw connector's housing, or on the internal dimple connector - are essential for a pressure-tight seal to prevent pressure drop when pumping the necessary fluids through the coil tubing to operate the BHA when carrying out operations.
  • tubing suffers ovality, nicks and abrasions, and other surface damage during its production and during operations being reeled on and off the coil tubing drum rendering the tubing surface in many instances unsuitable for a pressure retaining o-ring seal.
  • the invention provides a method of connecting a tube to a tubular element, said method comprising the steps of: abutting an end face of the tube to a first face of a sealing ring; abutting an end face of the tubular element to a second, opposite, face of said sealing ring; applying an axial compressive force to urge the tube towards the tubular element, thereby compressing said sealing ring to form a seal between the tube and the tubular element; connecting said tube to said tubular element by means of a connector to maintain said compressive force sufficiently to maintain the seal so formed; wherein said connector is attached to said tube by means of a dimple arrangement.
  • said tubular element comprises a second tube.
  • said tubular element comprises a downhole tool connector.
  • said dimple arrangement is created by: forming indentations on an outside surface of said tube; locating said connector around the outside of the tube; and attaching the connector to the tube by means of grub screws that engage with said indentations.
  • said dimple arrangement is created by: providing a connector with indentations on its outside surface; locating said connector within the bore of the tube; and applying point loads to the tube at points corresponding to said indentations, thereby causing the tube wall to engage with said indentations.
  • the invention also provides apparatus for use in a method described herein, said apparatus comprising: (a) a top sub-assembly having an aperture therethrough to allow it to be passed over a tube to be connected, a plurality of threaded holes passing through the wall of the top sub-assembly to allow grub screws to be inserted to engage with the outside of a tube within the top sub-assembly, and a thread at one end for connection to a bottom sub-assembly; (b) a bottom subassembly comprising a thread at one end for connection to said top sub-assembly, a tool connector at the other end, and a cavity to accommodate a seal ring housing; (c) a seal ring housing having an aperture therethrough to accommodate the end of a tube to be connected; and a step within the bore of the housing to form an abutment face for a sealing ring.
  • said seal ring housing has a tapered portion on its external surface; said bottom sub-assembly cavity has a correspondingly tapered configuration; and an ⁇ '-ring groove is provided on the external surface of said seal ring housing or the internal surface of said cavity to allow an ⁇ '-ring seal to be formed between them.
  • the scope of the invention also includes a method of connecting a tube to a tubular element substantially as described herein, with reference to and as illustrated by any appropriate combination of the accompanying drawings.
  • the scope of the invention also further includes apparatus for use in a method of connecting a tube to a tubular element substantially as described herein, with reference to and as illustrated by any appropriate combination of the
  • Figure 1 illustrates, in cross-sectional view, a top sub-assembly for use in a method of the invention
  • Figure 2 illustrates, in cross-sectional view, a top sub-assembly and an end of a length of tubing as part of a method of the invention
  • Figure 3 illustrates, in cross-sectional view, a seal ring housing and seal for use in a method of the invention
  • Figure 4 illustrates, in cross-sectional view, a bottom sub-assembly, seal ring housing and seal for use in a method of the invention
  • Figures 5 and 6 illustrate, in cross-sectional view, stages in a method of the invention
  • Figure 7 illustrates a jig, in use, as part of a method of the invention
  • Figure 8 illustrates the use of a dimple and grub screw arrangement as part of the method of the invention
  • FIGS 9-10 illustrate how the method of the invention may be used to form an inline connection
  • Figures 11-12 illustrate a preferred configuration of a sealing ring abutment
  • Figures 13-14 illustrate how the method of the invention may be used to form an inline connection
  • Figures 15-16 illustrate a preferred sealing ring for use in the invention
  • Figures 17 and 18 illustrate a preferred arrangement of locking a sealing ring into position
  • Figures 19 -20 illustrate an assembly jig and method of forming an inline connection.
  • FIG. 1 illustrates, in partial cross-sectional view an embodiment of a top sub- assembly, generally indicated by 1, forming an element of apparatus of the invention and illustrating (in combination with the following figures) an embodiment of a method of the invention.
  • the top sub-assembly is generally tubular in configuration, having a bore 2 therethrough, sized to accommodate a tube to be connected.
  • Towards a first (uphole) end 3 of the sub-assembly are provided a number of threaded holes 4 passing through the wall 5 of the subassembly.
  • the holes 4 are disposed around the circumference of the subassembly, as indicated by the positions marked 4'.
  • an external thread 7 On the external surface of the sub-assembly 1, and at the other (downhole) end 6 of the assembly is an external thread 7 to enable the top top-assembly to be connected to a bottom sub-assembly to be described below.
  • This second end 6 is also provided with a section having an increased bore 8 to accommodate the end of a seal ring housing, to be described below.
  • Figure 2 illustrates, in cross-sectional view, the top sub-assembly 1 of Figure 1 into the bore 2 of which has been inserted the end of a length of tubing 9.
  • the outside surface 10 of the tubing 9 has been provided with a series of indentations 11 that correspond to the position of the holes 4 in the top sub-assembly 1.
  • Grub screws 12 are inserted into the threaded holes 4 to engage with the indentations 11 on the surface of the tubing 9 to connect the tubing to the top sub-assembly 1.
  • the end of the tubing 13 extends beyond the end of the top sub-assembly 1.
  • FIG. 3 illustrates, in cross-sectional view, a seal ring housing, generally indicated by 14, and a sealing ring 15 for use in the method of the invention.
  • the seal ring housing 14 is generally tubular in form, having a bore 16 to accommodate the end of a tube to be connected.
  • the bore 16 is provided with an inwardly-extending step 17 around the internal circumference of the bore to provide an abutment surface for the sealing ring 15.
  • An external portion of the seal ring housing is provided with a tapered region 18 and a ⁇ '-ring groove 19 into which an ⁇ '-ring (not illustrated) may be located to provide a seal between the seal ring housing 14 and a bottom sub-assembly to be described below.
  • the sealing ring 15 is of generally annular configuration.
  • Suitable materials for such a sealing ring would include graphite, soft iron, copper, Stainless steel, nickel- chromium alloys such as those sold under the Registered Trade Mark “Inconel”, metal (generally), hollow rings, and gas filled rings. Particularly preferred embodiments of seal arrangements are described below.
  • Such a seal arrangement might also comprise a modification of said abutment face, for example by provision of a more malleable portion of an abutment face by incorporating a ring of softer material into the abutment face.
  • the sealing ring 15 is formed of metal, and more preferably hollow.
  • metal rings copper (and especially annealed copper) is preferred, or for situations where hydrogen sulphide is present, malleable cast iron.
  • the sealing ring may, in preferred variants, be hollow, and filled with a filler such as asbestos or an inert gas.
  • FIG. 4 illustrates, in cross-sectional view, a bottom sub-assembly used in a method of the invention, and generally indicated by 20.
  • the bottom sub-assembly 20 is again of generally tubular form, and is provided at one end with an internal thread 21 to allow it to be attached to the top sub-assembly 1 via its external thread 7.
  • the other end of the bottom sub-assembly is provided with a tool connector region 22, in this embodiment comprising a second external thread 23 and an external ⁇ '-ring arrangement 24.
  • the interior of the bottom sub-assembly is provided with a cavity 25 so sized and shaped as to accept a seal ring housing 14.
  • the inside of the cavity is provided with a tapered region 26 to match the tapered region 18 on the seal ring housing 14.
  • Figure 5 illustrates, again in cross-sectional view, a further stage in the method of attaching the tube 9 to the tubular element, said element in this instance comprising the bottom sub-assembly 20 with tool connector 22.
  • the top sub- assembly 1 and the bottom sub-assembly have been joined together by means of the threaded regions 7 and 21 thereby bringing one face of the sealing ring 15 into alignment with the end face of the tube, and the other opposite face of the sealing ring into alignment with the abutment face of the step in the bore of the seal ring housing.
  • the components are illustrated in Figure 5 in a slightly spaced-apart configuration, for sake of clarity.
  • Figure 6 illustrates the next stage in the formation of the seal.
  • a ram 27, for example a hydraulic ram is inserted into the bore of the bottom sub-assembly at the downhole end, and bears against the end 28 of the seal ring housing 14.
  • An axial compressive force is applied by the ram 27 between the end of the seal ring housing 14 and the top sub-assembly 1 to cause engagement of the sealing ring 15 with the end face of the tube 9 and the step arrangement 17 on the seal ring housing to form a seal.
  • the seal ring housing 14 is free to move within the bottom sub-assembly 20, enabling the engagement between the tuning, sealing ring and seal ring housing to be made.
  • Sufficient force is preferably applied to cause deformation of the sealing ring 15. Whilst the force is still being applied, the bottom sub-assembly 20 and the top sub-assembly 1 are screwed together using the threads 7 and 21, in order to maintain the seal once the applied force has been removed.
  • Figure 7 illustrates a jig 29 for applying such a compressive force.
  • the jig comprises the hydraulic ram 27 and ram actuator 30 connected via legs 31 to a housing 32 having a cavity to support the uphole end 3 of the top sub-assembly.
  • the legs 31 are held in tension, thereby transmitting a balancing force to the uphole end 3 of the top sub-assembly 1.
  • Figure 8 illustrates an alternative embodiment of a method of the invention, in cross-sectional view.
  • the connection between the tube 9 and a second tubular element 33 is made entirely by dimple connections.
  • the top portion of Figure 8 is shown in a spaced out configuration, for clarity, and illustrates a connector sleeve 34 having a series of threaded holes 4 extending through the wall of the sleeve 34. These holes 4 are preferably disposed around the exterior of the sleeve to provide less point stress. Grub screws 12 are provided to screw into the holes, and have a domed end 35.
  • the external faces of the tube 9 and of the tubular element 33 are provided with indentations 11 at positions corresponding with the holes 4 in the sleeve 34.
  • a sealing ring 15 is provided between the end faces of the tube 9 and the tubular element 33, said ring having the form described above. Having attached one end of the sleeve 34 to the end of either the tube 9 or the tubular element 33 by means of the grub screws, axial compressive force is exerted on the assembly to cause the sealing ring 15 to form a seal between the two end faces. Whilst the force is still present, the sleeve is tightened onto the other element by means of grub screws, thereby maintaining the seal. The applied force can then be removed.
  • the lower portion of Figure 8 illustrates the arrangement once the grub screws 12 have been tightened into position.
  • the tubular element 33 can comprise another length of tubing.
  • Figures 9 and 10 illustrate a further variant of the method of the invention.
  • Figure 9 shows, in cross-sectional view, a portion of a wall of one end of a length of tubing, and an internal sleeve 36 provided with indentations 11 disposed around its surface.
  • the sleeve 36 is also provided with an outwardly-facing shoulder 38 around its periphery.
  • a connection between the sleeve and the tube may be made by (1) positioning a sealing ring 15 between the end face of the tube 9 and the end face of the shoulder 38; (2) applying an axial compressive force to the tube and sleeve, thereby urging the tube 9 and sleeve 36 together, thereby forming a seal between the tube 9 and the sleeve 36 by crushing the sealing ring 15; (3) applying a point force to the external face of the tube 9 at positions corresponding to the indentations 11, as illustrated by the arrows 37. This causes material from the tube wall 9 to be extruded into the indentations 11, as illustrated in Figure 10, thereby retaining the tube 9 and the sleeve 36 in their sealed relationship.
  • the axial compressive force may be removed.
  • an inline connection may be made by use of a face-seating sealing ring on the end of the tube, as described above.
  • the sleeve 36 may be a tubular element such as a tool connector.
  • Figure 11 illustrates a particularly preferred refinement of the end sealing face of a sleeve 36 of the invention.
  • a magnified portion of the apparatus is also shown. This is analogous to that illustrated in Figure 9.
  • the end sealing face of the shoulder 38 is undercut at an angle ⁇ relative to the transverse cross-section of the sleeve.
  • the inventor has found that by undercutting the face in this way, a better seal may be formed, as the undercut prevents the sealing ring 15 from being extruded from the gap between the sleeve and the end of the tube 9.
  • the inventors have found that an angle, ⁇ , of between 10 and 40°, and more preferable between 20 and 30° is particularly effective in this respect.
  • Figure 12 illustrates the corresponding refinement on the sleeve depicted in Figure 11, used when two tubes are to be joined. Again, a magnified portion of the region including the sealing rings 15 is also shown.
  • one or both of the seal-abutment faces of the sleeve 40 are also undercut by an angle ⁇ relative to the transverse cross-section of the sleeve.
  • the inventor has found that by undercutting the face in this way, a better seal may be formed, as the undercut prevents the sealing ring 15 from being extruded from the gap between the sleeve and the end of the tube 9.
  • the inventors have found that an angle, ⁇ , of between 10 and 40°, and more preferable between 20 and 30° is particularly effective in this respect.
  • Figures 13 and 14 illustrate a further example of the method and apparatus of the invention being used to form an inline connection.
  • the Figures illustrate a cross-section through one wall of a tube assembly to be joined.
  • This example illustrates the joining of two tubes 9 A, 9B.
  • a sleeve 40 is provided, having indentations 11 disposed about its outer surface.
  • the sleeve 40 is provided with an outwardly-facing ridge 39, having abutment faces on each side.
  • Sealing rings 15 may be located either side of the ridge 39, and the end face of each length of tube 9 A, 9B abutted against the outside faces of each sealing ring.
  • An axial compressive force is then applied to the assembly, urging the tubes 9A
  • dimple connections are again made between the tubes 9A and 9B by applying point forces as indicated by the arrows 37. A portion of the tube wall is forced into the indentations 11, thereby holding the elements in position, as illustrated in Figure 12. The axial compressive force may then be removed. It will be appreciated that the dimple connections may be made to each tube 9A, 9B either successively, or simultaneously.
  • FIGS 15 and 16 illustrate, in perspective and cross-sectional views respectively a preferred sealing ring 15 forming part of the invention.
  • the sealing ring 17 is circular, and is so sized such that the two end faces 41 of the ring are approximately the same size as the end face of a tube 9 to which the device is to be fitted.
  • each end face is provided with a number of concentric circular grooves 42 extending partway into the ring. These grooves allow the sealing ring to deform more easily when under compressive load, thereby improving the seal.
  • Concentric grooves are preferred over a single spiral groove, as a spiral groove can provide a leakage path in the case of seal failure.
  • concentric grooves provide a multiple of seals - one between each groove. Typically between two and eight such grooves will be provided, e.g. four grooves, as illustrated.
  • the sealing ring may be made of soft iron such as that sold under the Registered Trade Mark ARMCO®.
  • the ring may be made of another relatively soft metal, such as aluminium or copper, or an alloy such as those sold under the Registered Trade Marks INCONEL® (alloys containing predominantly nickel and chromium) or MONEL® (alloys containing predominantly nickel and copper).
  • the ring is manufactured from the same material from which the tube 9 is constructed. In this way, any unwanted electrolytic effects are avoided.
  • Figure 17 illustrates a further preferred arrangement for connecting an assembly to a tube 9.
  • the sleeve 36 is again provided with indentations 11 that will serve to receive the dimpled tube.
  • a sealing ring 15 is placed between the end face of the tube 9 and a compressions ring 43.
  • the compression ring 43 may also be provided with an undercut sealing face as described in relation to Figures 11 and 12.
  • a pre-load ring 44 may be tightened against the downhole face of the compression ring 43 thereby holding it in position, under compression, while the dimple connection is made (as shown in Figure 18).
  • a lock nut 45 may be tightened against the pre-load ring 44 to further secure the assembly.
  • each element of the assembly is shown in a slightly spaced-apart configuration, for clarity. The downhole assembly connection is also omitted, for clarity.
  • Figure 19 illustrates, in schematic form, an assembly jig and a method of forming a connection between a tube 9 and a tubular element, in this example a connector for a downhole tool assembly.
  • the elements are shown partially schematically, and in a spaced-apart configuration, for clarity.
  • a gripper unit 46 configured to grip the outside of the tube 9, to resist an axial compressive force to be exerted on the assembly to aid sealing.
  • the skilled addressee will be able to readily choose an appropriate arrangement for a gripper unit, but the inventor has found it particularly effective to use a collet having inwardly-facing teeth to grip the outer surface of the tube 9, said collet having a tapered outer surface, in combination with outer ring having a corresponding tapered surface that can be screwed onto a ring support causing the collet to grip the outer surface of the tube.
  • Adjacent the gripper unit 46 is a dimple connector jig 47, known in the art, which can apply point pressure to the tube 9 via a number of dimple presses 48 to form a dimple connection between the tube 9 and the inner sleeve 20.
  • a spacer unit 49 Adjacent the dimple connector jig 47 is a spacer unit 49, of generally cylindrical construction, and preferably furnished with a window arrangement 50 (comprising an aperture in the spacer unit 49) to allow visual inspection of the operation of a ram 27.
  • the window arrangement 50 allows access to the connection, should a lock nut assembly, illustrated in Figs 17 and 18 be used.
  • a ram 27 and ram actuator 30 that may be used to exert axial compression on the assembly, causing the sealing ring 15 to seal between the end faces of the tube 9 and inner sleeve 20. Whilst the seal abutment face of the inner sleeve 20 is illustrated with a flat transverse face, this may also be undercut, as discussed above.
  • Figure 20 illustrates the assembly of Figure 19 after formation of the dimple connection.
  • the gripper unit grips the outside face of the tube 9, and the dimple connector 47, spacer unit 49 and ram assembly 27, 30 are assembled on the end of coil tube 9 with the inner sleeve 20 in place.
  • the ram is actuated to compress the sealing ring 15 and form the seal. Any lock nuts (as illustrated in Fig 17 and 18) are tightened, and then pressure is applied to the tube 9 to form the dimple connections.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un procédé de raccordement d'un tube à un autre élément tubulaire, comprenant les étapes consistant à interposer une bague d'étanchéité entre les faces d'extrémité du tube et l'autre élément tubulaire ; appliquer une force de compression axiale sur l'ensemble pour comprimer la bague d'étanchéité pour former un joint d'étanchéité entre le tube et l'élément tubulaire et relier le tube à l'élément tubulaire au moyen d'un raccord, fixé par un agencement d'alvéoles pour maintenir la force de compression suffisamment pour maintenir le joint d'étanchéité. L'invention concerne également un appareil pour réaliser un tel raccordement, ayant un sous-ensemble supérieur avec une pluralité de trous filetés passant à travers sa paroi pour permettre d'insérer des vis sans tête pour être en prise avec l'extérieur d'un tube dans le sous-ensemble supérieur ; un filet au niveau d'une extrémité pour un raccordement à un sous-ensemble inférieur ; un sous-ensemble inférieur avec un filet au niveau d'une extrémité pour un raccordement au sous-ensemble supérieur, un raccord d'outil au niveau de l'autre extrémité, et une cavité pour loger un logement de bague d'étanchéité. L'invention concerne également un logement de bague d'étanchéité ayant une face de butée pour une bague d'étanchéité.
PCT/EP2015/070508 2015-09-08 2015-09-08 Améliorations de procédés et d'appareil pour le raccordement de tubes WO2017041832A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/EP2015/070508 WO2017041832A1 (fr) 2015-09-08 2015-09-08 Améliorations de procédés et d'appareil pour le raccordement de tubes

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Application Number Priority Date Filing Date Title
PCT/EP2015/070508 WO2017041832A1 (fr) 2015-09-08 2015-09-08 Améliorations de procédés et d'appareil pour le raccordement de tubes

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041377A1 (fr) * 1996-04-30 1997-11-06 B.D. Kendle Engineering Limited Raccord de tiges
US8505637B2 (en) * 2006-08-22 2013-08-13 Schlumberger Technolgoy Corporation System and method for forming a coiled tubing connection
US20130285374A1 (en) * 2011-01-13 2013-10-31 Kazumi Kobayashi Connecting structure for pressure piping
US20150198271A1 (en) * 2014-01-10 2015-07-16 David Wright Fluid connector assembly and method of establishing a fluid connection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041377A1 (fr) * 1996-04-30 1997-11-06 B.D. Kendle Engineering Limited Raccord de tiges
US8505637B2 (en) * 2006-08-22 2013-08-13 Schlumberger Technolgoy Corporation System and method for forming a coiled tubing connection
US20130285374A1 (en) * 2011-01-13 2013-10-31 Kazumi Kobayashi Connecting structure for pressure piping
US20150198271A1 (en) * 2014-01-10 2015-07-16 David Wright Fluid connector assembly and method of establishing a fluid connection

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