|Publication number||US1590357 A|
|Publication date||Jun 29, 1926|
|Filing date||Jan 14, 1925|
|Priority date||Jan 14, 1925|
|Publication number||US 1590357 A, US 1590357A, US-A-1590357, US1590357 A, US1590357A|
|Inventors||Frederick L Feisthamel|
|Original Assignee||John F Penrose|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (135), Classifications (13) |
|External Links: USPTO, USPTO Assignment, Espacenet|
US 1590357 A
Patented June 29, 1926.
unirao STATES PATENT OFFICE.
FRED-ERICK L. FEISTHAMEL, OF LOS ANGELES, CALIFORNIA, ASSIGNOB '10 JOHN F. PENROSE, OF NEWLYOBK, N. Y. Y
Application filed January 14, 1825.- Serial Ho. 2,881.
This invention relates to an improved type of pipe joint, and is particularly directed to a packed screw-threadedjoint especially adaptable for use in connection with well 6 casing, rotary drill-pipe, or well tubing.
-A string of well casing, which consists of lengths of easing screw-threaded to gether, may in many instances be at least four thousand feet in length, and as a casing string of such length may weigh approximately forty tons, it will be evident that the screw-threads joining the several lengths are subjected to heavy stripping strains. 1
It will also be understood that during the drilling of a well the casing is subjected to vibrations having an excessive crystalliaing efiect on such joints as are not tight. Further, well casings are subjected to heavy static pressure of the fluid column usually contained therein, this fluid having a con tained sand content which tends to work in between the screw-threads of the joints and 1 cause such wear as to render the joints more or less inefiicient and more liable to crystallization.
In the rotary system of drilling, mudladen fluid is forced down the drill stem by the slush pump under a pump pressure sometimes ashigh as 800 pounds per square inch, such tluiddischarging at the bottom of the well bore and returning to the ground surface through the well casing, and under these conditions and considering the heavy vibrations due to rotary drilling, it will be evident that even a slight looseness of any of the screw-threaded joints in either the casing strin or the drill-pipe string will be very liabe to be the cause of a parting of the string containing such loose joint.
It will thus. become apparent that it is desirable to prevent any sand-laden fluid from entering between the screw-threads of the several joints.
In view of the above, it is the object of the present invention to provide a screw-threaded ipe joint having provisions for packing su joint a ainst entrance of such fluids.
Various ot er objects and advanta es will be more fully apparent from the to lowing description oi the accompanying drawings, which form a part of this disclosure, and which illustrate apreferred form of embodiment of the invention.
Of the drawings:
Fig.1 is a vertical section through the co-- engaging ends of two pipe sections constituting a packed screw-threaded joint constructed'in accordance with the present in vention.
Fig. 2 is an enlarged partial section illustr'ating a modified form of joint, the component members being partly tightened.
Fig. 3 is a View similar to Fig. 2, showing the component members fully tightened.
Fig. 4 is a fragmentary section showing a modified form of outer packing, the component members of the joint being only partly tightened. I
Fig. 5 is a View similar to Fig; 4, showing the component members fully tightened; and Fig. 6 is an elevation of a pipe coupling and adjacent pipe ends constituting component parts of pipe joints embodying the principles of the present invention.
in thedrawings, there is shown the threaded ends of two adjacent casing sections 1 and 2 formed to provide what is usually referred to as an inserted joint, that is, the one section is screwed directly into the adjacent section without the use of an intervening collar, while in Fig. 6, there. is shown the two adjacent casin sections 1 and 2 jointed by an inter-me late coupling 3, the principles of the present invention being equall applicable in either case.
In ig. 1,'the up or end of the lower casing section 1 has aliub portion providing a shoulder 5 for engagement by an elevator, as is usually employed in oil field practice for raising or lowerlng a string of well cas ing, said end being internally screw-threaded and provided, at the base of said screw threads, with a concentric packing groove or recess 6 in which is positioned a packing ring 7 constructed of compressible material and angularly split as indicated at 8, to facilitate an easy insertion thereof into said groove. This packing ring may be constructed of an one of a wide ran e of pack- 1n material, or instance, it maybe of fiber, ru ber, composition, or one of the many ty es of hydraulic packing, or it maybe of re atively soft metal such as lead, babbitt, or
The lower end of the adjacent casing section 2 is screw-threaded for engagement into the section 1, said coengaging threads being preferably standard tapered pipe threads.- The threads on the section 2 terminate short of the lower endof said section and the pethat said ring will be entirely enclosed within its groove, as shown in Fig. 1.
In Figs. 2 and 3 there is shown a 'oint' having at its inner end the same pac ing structure as above described and which the packing ring 7' in the groove or recess 6 of the casing section 1 is radially compressed by engagement therewith of the tapered surface 9 of the casing section 2.
At the upper end of the section 2, there is formed an internal concentric recess 10 having a vertical side wall, the lower portion of said wall gradually curving inwardly to provide a cam surface 11, and
the casing section 1'? is provided above the base of its threads, with a shoulder 12, the outer diameter of which is slightly less than the major diameter of the recess 10 so that said shoulder may enter said recess.
Within the recess 10 there is positioned a ring 13 of packing material which may be of the same or of a different material than is the packing ring 7 When this ring 13 is constructed of a material which will normallyretain its ring contour, it will preferably be of rectangular contour in crosssection, as shown in Fig. 3, and in assembling the jointsaidring may be first laced withln the recess 10 or it may be sipped over the threaded end of the section 2, before the section 2 is inserted into the section 1. From an examination of Figs. 2 and 3, it will be clear that as the sections are screwed together the terminal tapered surface 9*" will engage the packing ring 7 and the shoulder or abutment 12 will engage the uppersurface of the packing ring 13, as shown in Fig. 2, and that as t e joint is furthertightened the packing ring 7 will be 'radially compressed, as previously explained, and the packing ring 13 will bodily e driven downwardly, its lower portion being turned inwardly by the cam surface 11 and radially compressed into the thread rooves of the casing section 2, as shown in Fig. 3, thus forming a fluid tight joint.
In Figs. 4 and 5, I have shown a pliable packing 13 in place of the packing ring 13, and which may be any suitable type of rope packing material, and in the use of such pliable packing it will be preferable that the sections are first assembled and partly screwed together, as shown in Fig. 4, and
the section 2*.
the packing then placed within the recess 10, a subsequent tightening of the joint causing the packing 13 to be radially compressed into the a jacent threadgrooves of It will be noted that the terminal ends of both the upper casing sections 2 and 2 are tapered inwardly and rounded so.as to have no sharp corners which would tend to catch upon the lower packing ring.
While the specific forms of embodiment herein illustrated and described are full capable of fulfilling all of the objects primarily stated, it is to be understood that I do not wish to limit the invention in this regard, for it is susceptible of embodiment in various other forms, all coming within the scope of the following claims.
I claim as my invention:
1. A rigid pipe joint comprising: a member having an internally screw-threaded end; a second member having an externally screw-threaded end for engagement into said first member; and a compressible packing ring interposed between opposed unthreaded peripheral surfaces of said members, one of said surfaces being longitudinally angled to cause radial compression of said ring during relative joint tightening translation of said members.
2. A rigid pipe joint comprising: 'a member having an internally screw-threaded end; a second member having an externally screw-threaded end for engagement into said first member, and compressible packing rings positioned respectively at opposite ends of the coengaging screw-threads between opposed peripheral surfaces of said members, said surfaces being formed to cause radial compression of sa1d rings during relative joint tightening translation of said members to seal the opposite ends of the screw-threads. v
3. A rigid pipe joint comprising: a member having -an internally screw-threaded end and provided wi h a packing groove beyond the. inner end of its threads; a compressible packing ring within said groove; a second member having an externally screw-threaded end and provided with. a
smooth longitudinally an led peripheral wall beyond said threads a apted to engage and radially compress said ring during relative joint tightening translation of the members; the extreme end of the second member being tapered or rounded to prevent said second member catching upon the ring during assemblin of the members.
In testimony whereo I have hereunto set my hand at Los Angeles, California, this 6th day of J ahuary, 1925.
FREDERICK L. FEISTHAMEL;
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2450581 *||Mar 28, 1945||Oct 5, 1948||Flex O Tube Company||Swivel connection|
|US2497986 *||Jun 30, 1947||Feb 21, 1950||Goode Joseph H||Adjustable pipe connection|
|US2497987 *||Sep 10, 1948||Feb 21, 1950||Goode Joseph H||Adjustable connection for pipes|
|US2508306 *||May 5, 1945||May 16, 1950||Houston Oil Field Mat Co Inc||Safety pipe joint|
|US2907589 *||Nov 5, 1956||Oct 6, 1959||Hydril Co||Sealed joint for tubing|
|US2915322 *||May 3, 1956||Dec 1, 1959||Jersey Prod Res Co||Tubing joint connection|
|US3047316 *||Oct 1, 1958||Jul 31, 1962||Atlas Bradford Company||Packed pin and box drill pipe coupling with means preventing extrusion of packing ring|
|US3054628 *||Jun 8, 1954||Sep 18, 1962||Atlas Bradford Company||Pipe coupling having a teflon sealing gasket|
|US3307860 *||Jan 15, 1965||Mar 7, 1967||Mobil Oil Corp||Joint for liner-carrying well pipe|
|US3784239 *||Sep 7, 1971||Jan 8, 1974||Carter J||Sealed, filament-wound plastic sleeve|
|US4537426 *||Jun 24, 1982||Aug 27, 1985||Ameron Inc.||Couplings for non-ferrous pipe|
|US4601498 *||Nov 15, 1982||Jul 22, 1986||Baker Oil Tools, Inc.||Deformable metal-to-metal seal|
|US4629225 *||Aug 9, 1985||Dec 16, 1986||Inco Alloys International, Inc.||Pipe joint for corrosion resistant alloys|
|US4706997 *||Nov 27, 1985||Nov 17, 1987||Carstensen Kenneth J||For A.P.I. standard round or buttress thread tubing or casing|
|US4878285 *||Nov 5, 1987||Nov 7, 1989||Carstensen Kenneth J||Method of assembling coupling to tubing or casting|
|US5263748 *||Sep 30, 1992||Nov 23, 1993||Carstensen Kenneth J||Couplings for standard A.P.I. tubings and casings|
|US5689871 *||Jun 14, 1996||Nov 25, 1997||Carstensen; Kenneth J.||Couplings for standard A.P.I. tubings and casings and methods of assembling the same|
|US6305723 *||Oct 27, 1998||Oct 23, 2001||Grant Prideco, L.P.||Tool joint and drill pipe made therefrom|
|US6561227||May 9, 2001||May 13, 2003||Shell Oil Company||Wellbore casing|
|US6575240||Feb 24, 2000||Jun 10, 2003||Shell Oil Company||System and method for driving pipe|
|US6604763 *||Apr 26, 2000||Aug 12, 2003||Shell Oil Company||Expandable connector|
|US6631759||Feb 12, 2002||Oct 14, 2003||Shell Oil Company||Apparatus for radially expanding a tubular member|
|US6631769||Feb 15, 2002||Oct 14, 2003||Shell Oil Company||Method of operating an apparatus for radially expanding a tubular member|
|US6634431||Oct 3, 2001||Oct 21, 2003||Robert Lance Cook||Isolation of subterranean zones|
|US6669205||Mar 5, 2002||Dec 30, 2003||Parker-Hannifin Corporation||Retainer gasket with pressure relief vents|
|US6684947||Feb 20, 2002||Feb 3, 2004||Shell Oil Company||Apparatus for radially expanding a tubular member|
|US6695357||Sep 4, 2002||Feb 24, 2004||Parker-Hannifin Corporation||Threaded pipe connection having a retainer gasket with pressure relief vents|
|US6705395||Feb 12, 2002||Mar 16, 2004||Shell Oil Company||Wellbore casing|
|US6712154||Oct 18, 2001||Mar 30, 2004||Enventure Global Technology||Isolation of subterranean zones|
|US6725919||Sep 25, 2001||Apr 27, 2004||Shell Oil Company||Forming a wellbore casing while simultaneously drilling a wellbore|
|US6739392||Sep 25, 2001||May 25, 2004||Shell Oil Company||Forming a wellbore casing while simultaneously drilling a wellbore|
|US6745845||Dec 10, 2001||Jun 8, 2004||Shell Oil Company||Isolation of subterranean zones|
|US6758278||Sep 25, 2001||Jul 6, 2004||Shell Oil Company||Forming a wellbore casing while simultaneously drilling a wellbore|
|US6811189 *||Oct 4, 2000||Nov 2, 2004||Grant Prideco, L.P.||Corrosion seal for threaded connections|
|US6823937||Feb 10, 2000||Nov 30, 2004||Shell Oil Company||Wellhead|
|US6857473||Mar 7, 2002||Feb 22, 2005||Shell Oil Company||Method of coupling a tubular member to a preexisting structure|
|US6857668 *||Jan 18, 2002||Feb 22, 2005||Grant Prideco, L.P.||Replaceable corrosion seal for threaded connections|
|US6892819||Sep 25, 2001||May 17, 2005||Shell Oil Company||Forming a wellbore casing while simultaneously drilling a wellbore|
|US6966370||Feb 20, 2002||Nov 22, 2005||Shell Oil Company||Apparatus for actuating an annular piston|
|US6968618||May 12, 2003||Nov 29, 2005||Shell Oil Company||Expandable connector|
|US6976541||Jan 22, 2003||Dec 20, 2005||Shell Oil Company||Liner hanger with sliding sleeve valve|
|US7011161||Oct 1, 2002||Mar 14, 2006||Shell Oil Company||Structural support|
|US7021390||Apr 18, 2003||Apr 4, 2006||Shell Oil Company||Tubular liner for wellbore casing|
|US7036582||Oct 1, 2002||May 2, 2006||Shell Oil Company||Expansion cone for radially expanding tubular members|
|US7040396||Feb 20, 2002||May 9, 2006||Shell Oil Company||Apparatus for releasably coupling two elements|
|US7044218||Oct 1, 2002||May 16, 2006||Shell Oil Company||Apparatus for radially expanding tubular members|
|US7044221||Feb 20, 2002||May 16, 2006||Shell Oil Company||Apparatus for coupling a tubular member to a preexisting structure|
|US7048062||Oct 1, 2002||May 23, 2006||Shell Oil Company||Method of selecting tubular members|
|US7048067||Oct 31, 2000||May 23, 2006||Shell Oil Company||Wellbore casing repair|
|US7055608||Apr 18, 2003||Jun 6, 2006||Shell Oil Company||Forming a wellbore casing while simultaneously drilling a wellbore|
|US7063142||Feb 15, 2002||Jun 20, 2006||Shell Oil Company||Method of applying an axial force to an expansion cone|
|US7077211||Jan 29, 2004||Jul 18, 2006||Shell Oil Company||Method of creating a casing in a borehole|
|US7077213||Oct 1, 2002||Jul 18, 2006||Shell Oil Company||Expansion cone for radially expanding tubular members|
|US7100684||Dec 18, 2002||Sep 5, 2006||Enventure Global Technology||Liner hanger with standoffs|
|US7100685||Jun 13, 2003||Sep 5, 2006||Enventure Global Technology||Mono-diameter wellbore casing|
|US7108061||Oct 25, 2002||Sep 19, 2006||Shell Oil Company||Expander for a tapered liner with a shoe|
|US7108072||Mar 5, 2003||Sep 19, 2006||Shell Oil Company||Lubrication and self-cleaning system for expansion mandrel|
|US7121337||Jun 1, 2005||Oct 17, 2006||Shell Oil Company||Apparatus for expanding a tubular member|
|US7121352||Jul 14, 2003||Oct 17, 2006||Enventure Global Technology||Isolation of subterranean zones|
|US7146702||Mar 7, 2005||Dec 12, 2006||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7147053||Aug 13, 2004||Dec 12, 2006||Shell Oil Company||Wellhead|
|US7159665||Jul 19, 2002||Jan 9, 2007||Shell Oil Company||Wellbore casing|
|US7159667||Feb 2, 2004||Jan 9, 2007||Shell Oil Company||Method of coupling a tubular member to a preexisting structure|
|US7168496||Jun 26, 2002||Jan 30, 2007||Eventure Global Technology||Liner hanger|
|US7168499||Sep 10, 2004||Jan 30, 2007||Shell Oil Company||Radial expansion of tubular members|
|US7172019||Mar 7, 2005||Feb 6, 2007||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7172021||Nov 3, 2004||Feb 6, 2007||Shell Oil Company||Liner hanger with sliding sleeve valve|
|US7172024||Mar 31, 2003||Feb 6, 2007||Shell Oil Company||Mono-diameter wellbore casing|
|US7174964||Jul 22, 2003||Feb 13, 2007||Shell Oil Company||Wellhead with radially expanded tubulars|
|US7185710||Jun 13, 2003||Mar 6, 2007||Enventure Global Technology||Mono-diameter wellbore casing|
|US7195061||Jun 2, 2005||Mar 27, 2007||Shell Oil Company||Apparatus for expanding a tubular member|
|US7195064||Aug 13, 2003||Mar 27, 2007||Enventure Global Technology||Mono-diameter wellbore casing|
|US7198100||Jun 2, 2005||Apr 3, 2007||Shell Oil Company||Apparatus for expanding a tubular member|
|US7201223||Mar 1, 2005||Apr 10, 2007||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7204007||Mar 4, 2005||Apr 17, 2007||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7216701||Jun 1, 2005||May 15, 2007||Shell Oil Company||Apparatus for expanding a tubular member|
|US7231985||Sep 10, 2004||Jun 19, 2007||Shell Oil Company||Radial expansion of tubular members|
|US7234531||Sep 19, 2002||Jun 26, 2007||Enventure Global Technology, Llc||Mono-diameter wellbore casing|
|US7240728||Sep 25, 2001||Jul 10, 2007||Shell Oil Company||Expandable tubulars with a radial passage and wall portions with different wall thicknesses|
|US7240729||Jan 30, 2004||Jul 10, 2007||Shell Oil Company||Apparatus for expanding a tubular member|
|US7246667||Sep 27, 2004||Jul 24, 2007||Shell Oil Company||Radial expansion of tubular members|
|US7258168||Jul 27, 2001||Aug 21, 2007||Enventure Global Technology L.L.C.||Liner hanger with slip joint sealing members and method of use|
|US7270188||Nov 22, 2002||Sep 18, 2007||Shell Oil Company||Radial expansion of tubular members|
|US7275601||Sep 28, 2004||Oct 2, 2007||Shell Oil Company||Radial expansion of tubular members|
|US7290605||Dec 10, 2002||Nov 6, 2007||Enventure Global Technology||Seal receptacle using expandable liner hanger|
|US7290616||Jun 26, 2002||Nov 6, 2007||Enventure Global Technology, L.L.C.||Liner hanger|
|US7299881||Sep 27, 2004||Nov 27, 2007||Shell Oil Company||Radial expansion of tubular members|
|US7308755||Mar 4, 2005||Dec 18, 2007||Shell Oil Company||Apparatus for forming a mono-diameter wellbore casing|
|US7325602||Sep 28, 2006||Feb 5, 2008||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7350563||Aug 14, 2002||Apr 1, 2008||Enventure Global Technology, L.L.C.||System for lining a wellbore casing|
|US7350564||May 20, 2005||Apr 1, 2008||Enventure Global Technology, L.L.C.||Mono-diameter wellbore casing|
|US7357188||Feb 23, 2000||Apr 15, 2008||Shell Oil Company||Mono-diameter wellbore casing|
|US7357190||Sep 28, 2004||Apr 15, 2008||Shell Oil Company||Radial expansion of tubular members|
|US7360591||Apr 17, 2003||Apr 22, 2008||Enventure Global Technology, Llc||System for radially expanding a tubular member|
|US7363690||Mar 2, 2005||Apr 29, 2008||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7363691||Mar 3, 2005||Apr 29, 2008||Shell Oil Company||Method and apparatus for forming a mono-diameter wellbore casing|
|US7363984||May 12, 2003||Apr 29, 2008||Enventure Global Technology, Llc||System for radially expanding a tubular member|
|US7377326||Aug 18, 2003||May 27, 2008||Enventure Global Technology, L.L.C.||Magnetic impulse applied sleeve method of forming a wellbore casing|
|US7383889||Nov 12, 2002||Jun 10, 2008||Enventure Global Technology, Llc||Mono diameter wellbore casing|
|US7398832||May 5, 2003||Jul 15, 2008||Enventure Global Technology, Llc||Mono-diameter wellbore casing|
|US7404444||Aug 18, 2003||Jul 29, 2008||Enventure Global Technology||Protective sleeve for expandable tubulars|
|US7410000||May 20, 2005||Aug 12, 2008||Enventure Global Technology, Llc.||Mono-diameter wellbore casing|
|US7416027||Aug 13, 2002||Aug 26, 2008||Enventure Global Technology, Llc||Adjustable expansion cone assembly|
|US7419009||Mar 18, 2005||Sep 2, 2008||Shell Oil Company||Apparatus for radially expanding and plastically deforming a tubular member|
|US7424918||Aug 18, 2003||Sep 16, 2008||Enventure Global Technology, L.L.C.||Interposed joint sealing layer method of forming a wellbore casing|
|US7434618||Jun 1, 2005||Oct 14, 2008||Shell Oil Company||Apparatus for expanding a tubular member|
|US7438132||Apr 23, 2003||Oct 21, 2008||Shell Oil Company||Concentric pipes expanded at the pipe ends and method of forming|
|US7438133||Feb 26, 2004||Oct 21, 2008||Enventure Global Technology, Llc||Apparatus and method for radially expanding and plastically deforming a tubular member|
|US7503393||Jan 26, 2004||Mar 17, 2009||Enventure Global Technology, Inc.||Lubrication system for radially expanding tubular members|
|US7513313||Sep 22, 2003||Apr 7, 2009||Enventure Global Technology, Llc||Bottom plug for forming a mono diameter wellbore casing|
|US7516790||Jan 9, 2003||Apr 14, 2009||Enventure Global Technology, Llc||Mono-diameter wellbore casing|
|US7552776||Oct 13, 2005||Jun 30, 2009||Enventure Global Technology, Llc||Anchor hangers|
|US7556092||Feb 15, 2002||Jul 7, 2009||Enventure Global Technology, Llc||Flow control system for an apparatus for radially expanding tubular members|
|US7559365||Nov 12, 2002||Jul 14, 2009||Enventure Global Technology, Llc||Collapsible expansion cone|
|US7571774||Aug 18, 2003||Aug 11, 2009||Eventure Global Technology||Self-lubricating expansion mandrel for expandable tubular|
|US7603758||Feb 14, 2001||Oct 20, 2009||Shell Oil Company||Method of coupling a tubular member|
|US7665532||Oct 19, 2007||Feb 23, 2010||Shell Oil Company||Pipeline|
|US7712522||Apr 3, 2007||May 11, 2010||Enventure Global Technology, Llc||Expansion cone and system|
|US7739917||Aug 18, 2003||Jun 22, 2010||Enventure Global Technology, Llc||Pipe formability evaluation for expandable tubulars|
|US7740076||Mar 4, 2003||Jun 22, 2010||Enventure Global Technology, L.L.C.||Protective sleeve for threaded connections for expandable liner hanger|
|US7775290||Apr 15, 2004||Aug 17, 2010||Enventure Global Technology, Llc||Apparatus for radially expanding and plastically deforming a tubular member|
|US7793721||Mar 11, 2004||Sep 14, 2010||Eventure Global Technology, Llc||Apparatus for radially expanding and plastically deforming a tubular member|
|US7819185||Aug 12, 2005||Oct 26, 2010||Enventure Global Technology, Llc||Expandable tubular|
|US7886831||Aug 6, 2007||Feb 15, 2011||Enventure Global Technology, L.L.C.||Apparatus for radially expanding and plastically deforming a tubular member|
|US7918284||Mar 31, 2003||Apr 5, 2011||Enventure Global Technology, L.L.C.||Protective sleeve for threaded connections for expandable liner hanger|
|US8544304||Aug 21, 2008||Oct 1, 2013||Tenaris Connections Limited||Method for improving fatigue resistance of a threaded joint|
|US8840152||Mar 28, 2011||Sep 23, 2014||Tenaris Connections Limited||Thin-walled pipe joint|
|US20100181761 *||Jul 15, 2008||Jul 22, 2010||Tenaris Connections Ag||Threaded joint with resilient seal ring|
|US20110298211 *||Feb 19, 2010||Dec 8, 2011||Swagelok Company||Conduit fitting with split torque collar|
|DE1155945B *||Aug 9, 1955||Oct 17, 1963||Dalmine Spa||Rohrverschraubung fuer unter Druck stehende Fluessigkeiten oder Gase|
|DE2355692A1 *||Nov 7, 1973||May 22, 1975||Katsuhiko Wakabayashi||Verbindungseinrichtung|
|DE3312528A1 *||Apr 7, 1983||Oct 20, 1983||Otis Eng Co||Rohrverbindung|
|EP1377772A1 *||Jan 18, 2002||Jan 7, 2004||Grant Prideco LP||Replaceable corrosion seal for threaded connections|
|WO2000025029A1 *||Oct 26, 1999||May 4, 2000||Grant Prideco Inc||Tool joint and drill pipe made therefrom|
|WO2002068854A1 *||Jan 18, 2002||Sep 6, 2002||Griffin Richard C||Replaceable corrosion seal for threaded connections|