US3678727A - Stretch-draw tubing process - Google Patents

Stretch-draw tubing process Download PDF

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Publication number
US3678727A
US3678727A US67476A US3678727DA US3678727A US 3678727 A US3678727 A US 3678727A US 67476 A US67476 A US 67476A US 3678727D A US3678727D A US 3678727DA US 3678727 A US3678727 A US 3678727A
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tube
tubing
tools
stretching
right angles
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Robert G Jackson
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles

Definitions

  • ABSTRACT Metallic tubing is drawn under tri-axial stress.
  • a tube which has the capability of cold work is used as a starting material.
  • the tube is stretched longitudinally under cold workingconditions without restraint against reduction in diameter and in cross section into the plastic range but below the point of necking to reduce its diameter.
  • the tube is drawn with tools which subject it to force inwardly on two axes at right angles to the longitudinal axis and at right angles to one another under cold working conditions into the plastic range.
  • the cold worked condition of the tube is retained during the stretching and drawing.
  • the invention relates to a process of making metal tubes or pipes of any cold workable metal by stretch-drawing.
  • a purpose of the invention is to reduce the wall thickness and diameter of a tube by tri-axial deformation, one axis being the longitudinal axis and the other two axes being at right angles to the longitudinal axis and at right angles to one another.
  • a further purpose is to start with a tube capable of cold work and preferably annealed, to stretch the tube longitudinally under cold working conditions without restraint against reduction in diameter and in cross section into the plastic range but below the point of necking to reduce the tube cross section, and then to draw the tube with tools which subject it to force inwardly on two axes at right angles to the longitudinal axis and at right angles to one another under cold working conditions into the plastic range, the tube retaining its condition of cold work during the stretching and drawing.
  • a further purpose is to perform the two axes drawing on the tube with tools according to the process of sinking, plug drawing, core drawing, rod drawing, taper drawing, rock-rite drawing, or otherwise.
  • FIG. 1 is a broken side elevation of a metallic tube which may comprise the raw material of the invention.
  • FIG. 2 is an end elevation of the tube of FIG. 1.
  • FIG. 3 is a broken side elevation of the tube subjected to uniform stretching longitudinally, showing the result of the stretching in reducing the cross-section or diameter and wall.
  • FIG. 4 is a broken side elevation of a tube after the first step of compression drawing, in this case bar drawing, illustrating the reduction in cross-section where both the diameter and wall thickness are reduced.
  • FIG. 5 is an end elevation of a fragment of the tube of FIG. 4 to enlarged scale showing one set of arrows or axis applying radial pressure to the tube wall to reduce its thickness and another set of arrows or axis applying hoop stress in the tube wall at right angles to the radial axis.
  • FIG. 6 is a broken side elevation of the tube of FIGS. 4 and 5 which has been subjected to a first sinking operation, according to the invention.
  • FIG. 7 is an enlarged fragmentary end elevation of the tube of FIG. 6, showing the first sinking.
  • the sinking tools are suggested by one set of arrows or axis applying stress radial of the tube wall, and another set of arrows or axis applying stress at right angles to said radial axis, both of the axes of stress being at right angles to the longitudinal stress.
  • FIG. 8 is a broken side elevation of the result of the second sinking operation applied to the tube of FIGS. 6 and 7.
  • FIG. 9 is an enlarged fragmentary end elevationof the tube of FIG. 8 after the second sink, one set of arrows or axis being radial and the other set of arrows or axis beingat right angles to said radial axis, both of the axes being at right angles to the longitudinal stress.
  • FIG. 10 is a broken side elevation of the result of the third sinking operation on the tube of FIGS. 8 and 9.
  • FIG. 11 is an enlarged fragmentary end elevation of the tube of FIG. 10 showing two sets of arrows to suggest the action of the third set of sinking tools, one set of arrows showing stress in the radial direction and the other set of arrows showing stress at right angles to the radial direction, both axes of stress being at right angles to the longitudinal direction.
  • FIG. 1 1a is a fragmentary enlarged end elevation of a tube which is undergoing drawing according to the second step of Example 5 one arrow being in the radial direction and the other set of arrows in tension at right angles to the radial direction, both of the axes of stress being at right angles to the longitudinal direction.
  • FIG. 12 is a stress-strain curve useful in explaining the invention.
  • FIGS. 13 to 21 are photomicrographs of the tubing at various steps in the process, examined at diameters and electrolytically etched with oxalic acid.
  • All of the specimens are of type 304 or 18 percent chromium and 8 percent nickel stainless steel of commercial grade.
  • FIG. 13 is a transverse section of the raw material of FIG. 1.
  • FIG. 14 is a longitudinal section of the raw material of FIG. 1.
  • FIG. 15 is a transverse section of the tube of FIG. 3 after undergoing uniform stretching.
  • FIG. l6, is a longitudinal section of the tube of FIG. 3.
  • FIG. 17 is a transverse section of the tube of FIG. 4 after the bar drawing pass.
  • FIG. 18 is a longitudinal section of the bar drawn tube of FIG. 4.
  • FIG. 19 is a transverse section of the: tube of FIG. 6 afler undergoing the first sinking.
  • FIG. 20 is a transverse section of the tube of FIG. 8 after the second sinking.
  • FIG. 21 is a transverse section of the tube of FIG. 10 after the third sinking.
  • FIGS. 22 to 24 are photomicrographs relating to an experi ment on stainless steel type 304 tubing explained in Example 4. The tubing was examined transversely at 200 diameters and electrolytically etched with oxalic acid.
  • FIG. 22 was the result of stretching annealed tubing 7 percent and sinking it.
  • FIG. 23 was the result of stretching annealed tubing 15 percent and then sinking it.
  • FIG. 24 was the result of sinking annealed tubing.
  • a tube is stretched and reduced in diameter and cross section only as one step of a process of triaxial stretch-drawing, obtained from stretching, with the tube retaining its cold work from stretching while it is undergoing drawing.
  • the invention is operative on all ductile metals including those which crystallize on the face centered cubic system, body centered cubic system, hexagonical system and tetragonal system.
  • it is applicable to iron and its alloys, copper and its alloys, aluminum and its alloys, zirconium and its alloys, titanium and its alloys, nickel and its alloys, cobalt and its alloys, silver and its alloys, gold and its alloys, platinum and its alloys, and many other metals and alloy systems too numerous to mention.
  • the raw material must have a capability of further cold work, and be in the form of a tube or tube blank. In many cases the raw material will be fully annealed before stretching, but in other cases it will have some heat treatment which does not fully recrystallize. Thus, it may be partially annealed, stress relieved or have an alloy solution heat treatment before stretching. If the previous drawing of the tube blank leaves it capable of undergoing further cold work, it may be'used without a softening heat treatment.
  • the stretching is a uniform longitudinal pulling operation which in its simplest form may be performed with a tensile testing machine or any apparatus capable of gripping the tube blank at the ends and producing a uniform elongation with capability of reduction in cross section (diameter and wall thickness). Thus, a mandrel drawing operation will not suffice.
  • the conditions under which the stretching is carried out must be cold working conditions and if any heat is present, it must not be sufficient to cause recrystallization.
  • Point A is the yield strength at 0.2 percent offset. Between the point of origin and the point A the elongation is elastic and for practical purposes the working is within the proportional limit. Between the point A and B permanent deformation takes place.
  • Point B is the point of maximum stress which the metal can withstand under a uni-axial tensile test. Between points A and B the metal undergoes uniform strain throughout the length and cross section under test and in this range the metal is plastically uni-axially deformed. The effect of the elongation in this range is to reduce the diameter of the tube undergoing stretching and to reduce the wall thickness.
  • Point C is the failure or fracture point. Between points B and C the metal undergoes necking, and the deformation takes place in a localized area. It is not proper to elongate to this extent.
  • the effect of the stretching is to produce cold work and it is important to preserve partially or wholly the effect of that cold work in the subsequent drawing with tools.
  • the work is removed from the stretching, or permissibly the tube drawing is performed in the same machine.
  • the tube drawing applies a force inwardly to the tube on two transverse axes at right angles to the longitudinal axis of the stretching and at right angles to one another. In effect it subjects the tube to compressive plastic deformation.
  • the drawing with tools is accomplished in several different operations, and they may be commercial tube reducing operations such as sinking, plug drawing, core drawing, rod drawing, taper drawing, rock-rite drawing or otherwise.
  • tube reducing operations such as sinking, plug drawing, core drawing, rod drawing, taper drawing, rock-rite drawing or otherwise.
  • they must be carried out under cold working conditions, that is, below the recrystallization temperature. If any heat treatment is used after the stretching or between the cold drawing operations, it should not be sufficient to fully recrystallize as the effect of the previous cold work would then be lost.
  • the tube is subjected to tri-axial stress being stretched in the longitudinal direction by the stretching and in the two transverse directions by the tube drawing.
  • Tri-axial forming of tubing produces a product which is mechanically stronger than uni-axial or bi-axial drawing.
  • Triaxial forming permits more cold deformation than uni-axial or bi-axial forming.
  • crystallographic effect on cold worked metals is less with tri-axial than with uni-axial or biaxial forming. All of these advantages of tri-axial forming and more are obtained by the stretch-draw process on tubing. Some of these advantages will be illustrated in the examples presented herein.
  • next step will be another cycle of stretching and then drawing with tools.
  • the product of the stretch-drawing may be heat treated and then subjected to a further drawing operation which may be stretch-drawing.
  • the product of stretch-drawing may be heat treated and then marketed. In other cases the stretchdrawn product will be marketed without heat treatment.
  • Example 1 will be understood best by reference to FIGS. 1 to 11 and 13 to 21.
  • the raw material in this case is a welded tube which has been reduced by rod drawing to a tube blank 30, which has then been fully annealed.
  • the tube blank 30 is then gripped as by grips at the ends and stretched according to FIG. 3 to form the stretched tube 31.
  • the arrows 32 suggest the elongation by grips.
  • the results of elongation in this case is of the order of 25 percent reduction in tube cross-section and is in the range AB and not beyond the point of necking.
  • the operation is at ambient temperature in this case, and the metal does not become hot enough to recrystallize. There is no internal restraint on the tube, and therefore as shown it is able to reduce its diameter uniformly and reduce its wall thickness uniformly.
  • the tube is subjected to drawing with tools as shown in FIGS. 3 to 11.
  • FIG. 4 shows the tube 32 after the bar drawing and FIG. 5 by arrows 33 suggests the action of the tools in compression reducing the tube on one transverse axis while arrows 34 suggest the reduction of the tube on another transverse axis at right angles to the axis 33.
  • FIGS. 6 and 7 show the tube 35 after the first sinking operation.
  • the effect of the sinking operation in compressibly reducing the tube is suggested by arrows 36 which show one transverse axis and by arrows 37 which show the other transverse axis at right angles to axis 36.
  • FIGS. 8 and 9 show the tube 38 after the second sinking operation.
  • Arrows 40 suggest the compressible reduction on one transverse axis and arrows 41 suggest the reduction on another transverse axis at right angles to axis 40.
  • FIG. 10 shows the tube 42 after the third sinking operation.
  • Arrows 43 in FIG. 11 suggest the action of the tools in reducing the tube by compression on one transverse axis and arrows 44 suggest the action of compressing the tube on a transverse axis to right angles to the axis 43.
  • FIG. 13 shows a transverse photomicrograph of the blank 30, and FIG. 14 is the longitudinal section.
  • the grain size is ASTM 6.
  • FIG. 17 shows the cross section of the tube 32 after the bar pass
  • FIG. 18 shows the longitudinal section after the bar pass.
  • the grain size in cross section is ASTM 7, and the grain size in longitudinal section is ASTM 7.
  • the grains are elongated in the longitudinal specimen.
  • FIG. 19 shows a photomicrograph of the tube 35 after the first sink pass.
  • the grain size is ASTM 8.
  • FIG. 20 shows a photomicrograph of tube 38 after the second sink pass.
  • the grain size is ASTM 9.5.
  • FIG. 21 shows the photomicrograph tube 42 after the third sink pass.
  • the grain size is ASTM l0.
  • Table I shows the mechanical properties.
  • stretch tube 31 has a matte surface which tends to hold lubricant on the surface of the tube during the bar drawing.
  • the other tubes have a shiny surface.
  • Example 2 demonstrates in a zirconium alloy that the hardening produced by stretching serves to produce a more drawable material with less tendency to gall or pick up on the tools than other drawing operations. It is possible by stretchdrawing to produce much more severe draws without failure of the work than would be possible in drawing soft zirconium alloy.
  • the raw material is welded tube lengths of Zircaloy 2 which has the following analysis:
  • the raw material is a nuclear circular canning tube having the following properties:
  • the tubes were engaged in the grip of a long throat tensile machine and stretched without any lateral restraint.
  • the tubes could be stretched uniformly to approximately 14 percent but in order not to produce any problem regarding the ultimate tensile strength or to generate any necking the stretching was stopped at l l percent.
  • Each tube was measured at two inch intervals before and after stretching over the original middle 24 inches of the tube. The data were as follows:
  • the diameter was 0.567 inch before stretching with ovality of 0.0010 inch.
  • the tube was stretched to a load original tube cross section or 97,200 psi the tube as stretched.
  • the tubes were drawn by conventional methods without any intermediate heat treatment.
  • the maximum draw on fully annealed Zircaloy 2 tubing in conventional practice is 30-35 percent of the cross sectional area which must be followed by an anneal. Also, the tube must be coated in normal practice with an ultra high plastic lubricant to prevent galling and tearing.
  • the specimens of the invention were drawn 32 percent of the cross sectional area by standard rod drawing without special lubricant. The drawn surface was better than the usual surface on such tubing. The tubing was then rod drawn for an additional 24 percent and sunk for an additional 17 percent reduction in cross section area. The total drawn tube reduction in cross section area was 62 percent of the original area. This was done without special lubricant and without any intermediate heat treatment.
  • Solution heat treatment alloys such as aluminum alloys will respond better to subsequent aging or resolution and aging due to more uniform dispersion of elements by tri-axial forming.
  • Aluminum alloy 6061 has the following analysis:
  • This alloy is solution heat treated and then stretch-drawn after which it is aged. The tri-axial deformation also produces a three dimensionally more uniform metal lattice distortion which responds more uniformly and efficiently in the solution and subsequent coherent precipitation. The more uniform dispersion of age hardening particles is evident in superior properties.
  • Example 4 In Example 4 type 304 stainless steel tubing is stretchdrawn, less than the maximum amount in order to preserve ductility while improving strength by cold work.
  • the purpose is to produce a stretch-drawn tube with pro perties superior to existing tubing.
  • the commercial application is especially in tubing for hydrolyics and for a fast breeder reactor in which work-hardened tubing 304 stainless steel has applications in heat exchangers and condensers.
  • FIG. 11a where arrow 33' is radial and arrows 34' indicate hoop stress in tension, rather than any compression as in other forms.
  • This process has the advantage of working tubes with large outside diameter and light walls in which stretching is performed first and is an easy operation, but inward two axes drawing is a difficult operation due to wrinkling of the wall, tearing, and the like.
  • type 304 stainless steel tubing with a wall thickness of 0.0050 inch, the wall can be stretched and then an internal plug expanded to bring the outside diameter to two inches again, with a net reduction in wall thickness to 0.0040 inch. Note that this wall reduction can be accomplished without touching the tube outside diameter.
  • the percentage reduction in area has been maintained at a high level.
  • the stretch-drawn tube is ten full points in hardness lower than the straight sunk tube.
  • EXAMPLE 5 A further application of stretch drawing is to perform the two axes drawing subsequent to the elongation by expanding the tube diameter with tools according to the process of internal diameter expanding with the mandrel, a plug or otherwise. This procedure is tri-axial the same as that obtained from stretch followed by inward force drawing except that the direction of the inward forces is reversed. This process is sugall or part of the benefits of my invention without copying the process shown, and I therefore claim all such insofar as they fall within the reasonable spirit and scope of my claims.

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826124A (en) * 1972-10-25 1974-07-30 Zirconium Technology Corp Manufacture of tubes with improved metallic yield strength and elongation properties
US4156360A (en) * 1976-11-12 1979-05-29 Vallourec (Usines A Tubes De Lorraine-Escaut Et Vallourec Reunies) Method and apparatus for unstressing pipe and the resulting pipe
EP0897764A1 (en) * 1998-02-20 1999-02-24 HME Nederland B.V. Method of manufacturing a (copper) tube which is insensitive to stress corrosion
US6029714A (en) * 1994-04-14 2000-02-29 Sumitomo Metal Industries, Ltd. Stainless steel pipe of bright annealing finish type, having highly-smoothed inner surface and method for producing the same
US20040194278A1 (en) * 2003-03-06 2004-10-07 Lone Star Steel Company Tubular goods with expandable threaded connections
US6817633B2 (en) 2002-12-20 2004-11-16 Lone Star Steel Company Tubular members and threaded connections for casing drilling and method
US20040228679A1 (en) * 2003-05-16 2004-11-18 Lone Star Steel Company Solid expandable tubular members formed from very low carbon steel and method
US20040244968A1 (en) * 1998-12-07 2004-12-09 Cook Robert Lance Expanding a tubular member
US20040250597A1 (en) * 2001-10-29 2004-12-16 Rudolf Bultmann Method and device for production of hollow sections
US20050223535A1 (en) * 2000-10-02 2005-10-13 Cook Robert L Method and apparatus for forming a mono-diameter wellbore casing
US20060162937A1 (en) * 2002-07-19 2006-07-27 Scott Costa Protective sleeve for threaded connections for expandable liner hanger
US20070131431A1 (en) * 2002-09-20 2007-06-14 Mark Shuster Self-Lubricating expansion mandrel for expandable tubular
US7240728B2 (en) 1998-12-07 2007-07-10 Shell Oil Company Expandable tubulars with a radial passage and wall portions with different wall thicknesses
US20070228729A1 (en) * 2003-03-06 2007-10-04 Grimmett Harold M Tubular goods with threaded integral joint connections
US7308755B2 (en) 2003-06-13 2007-12-18 Shell Oil Company Apparatus for forming a mono-diameter wellbore casing
US7350564B2 (en) 1998-12-07 2008-04-01 Enventure Global Technology, L.L.C. Mono-diameter wellbore casing
US7350563B2 (en) 1999-07-09 2008-04-01 Enventure Global Technology, L.L.C. System for lining a wellbore casing
US7357190B2 (en) 1998-11-16 2008-04-15 Shell Oil Company Radial expansion of tubular members
US7357188B1 (en) 1998-12-07 2008-04-15 Shell Oil Company Mono-diameter wellbore casing
US7360591B2 (en) 2002-05-29 2008-04-22 Enventure Global Technology, Llc System for radially expanding a tubular member
US7363984B2 (en) 1998-12-07 2008-04-29 Enventure Global Technology, Llc System for radially expanding a tubular member
US7377326B2 (en) 2002-08-23 2008-05-27 Enventure Global Technology, L.L.C. Magnetic impulse applied sleeve method of forming a wellbore casing
US7383889B2 (en) 2001-11-12 2008-06-10 Enventure Global Technology, Llc Mono diameter wellbore casing
US7398832B2 (en) 2002-06-10 2008-07-15 Enventure Global Technology, Llc Mono-diameter wellbore casing
US7419009B2 (en) 1998-12-07 2008-09-02 Shell Oil Company Apparatus for radially expanding and plastically deforming a tubular member
US7424918B2 (en) 2002-08-23 2008-09-16 Enventure Global Technology, L.L.C. Interposed joint sealing layer method of forming a wellbore casing
US7438133B2 (en) 2003-02-26 2008-10-21 Enventure Global Technology, Llc Apparatus and method for radially expanding and plastically deforming a tubular member
US7503393B2 (en) 2003-01-27 2009-03-17 Enventure Global Technology, Inc. Lubrication system for radially expanding tubular members
US7513313B2 (en) 2002-09-20 2009-04-07 Enventure Global Technology, Llc Bottom plug for forming a mono diameter wellbore casing
US7516790B2 (en) 1999-12-03 2009-04-14 Enventure Global Technology, Llc Mono-diameter wellbore casing
US7556092B2 (en) 1999-02-26 2009-07-07 Enventure Global Technology, Llc Flow control system for an apparatus for radially expanding tubular members
US20090188110A1 (en) * 2002-09-03 2009-07-30 Seok Hwan Moon Micro heat pipe with poligonal cross-section manufactured via extrusion or drawing
US20100000286A1 (en) * 2007-03-20 2010-01-07 Sumitomo Metal Industries, Ltd. Welded Component Comprising Seamless Bent Pipe and Seamless Straight Pipe Sections and Methods of Manufacturing Thereof
US7712522B2 (en) 2003-09-05 2010-05-11 Enventure Global Technology, Llc Expansion cone and system
US7739917B2 (en) 2002-09-20 2010-06-22 Enventure Global Technology, Llc Pipe formability evaluation for expandable tubulars
US7740076B2 (en) 2002-04-12 2010-06-22 Enventure Global Technology, L.L.C. Protective sleeve for threaded connections for expandable liner hanger
US7819185B2 (en) 2004-08-13 2010-10-26 Enventure Global Technology, Llc Expandable tubular
US7886831B2 (en) 2003-01-22 2011-02-15 Enventure Global Technology, L.L.C. Apparatus for radially expanding and plastically deforming a tubular member
US7918284B2 (en) 2002-04-15 2011-04-05 Enventure Global Technology, L.L.C. Protective sleeve for threaded connections for expandable liner hanger

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RU2158641C1 (ru) * 1999-03-10 2000-11-10 Рашников Сергей Филиппович Способ производства профильных композиционных изделий

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Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826124A (en) * 1972-10-25 1974-07-30 Zirconium Technology Corp Manufacture of tubes with improved metallic yield strength and elongation properties
US4156360A (en) * 1976-11-12 1979-05-29 Vallourec (Usines A Tubes De Lorraine-Escaut Et Vallourec Reunies) Method and apparatus for unstressing pipe and the resulting pipe
US6029714A (en) * 1994-04-14 2000-02-29 Sumitomo Metal Industries, Ltd. Stainless steel pipe of bright annealing finish type, having highly-smoothed inner surface and method for producing the same
EP0897764A1 (en) * 1998-02-20 1999-02-24 HME Nederland B.V. Method of manufacturing a (copper) tube which is insensitive to stress corrosion
US7357190B2 (en) 1998-11-16 2008-04-15 Shell Oil Company Radial expansion of tubular members
US7363984B2 (en) 1998-12-07 2008-04-29 Enventure Global Technology, Llc System for radially expanding a tubular member
US7665532B2 (en) 1998-12-07 2010-02-23 Shell Oil Company Pipeline
US20040244968A1 (en) * 1998-12-07 2004-12-09 Cook Robert Lance Expanding a tubular member
US7434618B2 (en) 1998-12-07 2008-10-14 Shell Oil Company Apparatus for expanding a tubular member
US7357188B1 (en) 1998-12-07 2008-04-15 Shell Oil Company Mono-diameter wellbore casing
US7419009B2 (en) 1998-12-07 2008-09-02 Shell Oil Company Apparatus for radially expanding and plastically deforming a tubular member
US7603758B2 (en) 1998-12-07 2009-10-20 Shell Oil Company Method of coupling a tubular member
US7350564B2 (en) 1998-12-07 2008-04-01 Enventure Global Technology, L.L.C. Mono-diameter wellbore casing
US7240728B2 (en) 1998-12-07 2007-07-10 Shell Oil Company Expandable tubulars with a radial passage and wall portions with different wall thicknesses
US7556092B2 (en) 1999-02-26 2009-07-07 Enventure Global Technology, Llc Flow control system for an apparatus for radially expanding tubular members
US7350563B2 (en) 1999-07-09 2008-04-01 Enventure Global Technology, L.L.C. System for lining a wellbore casing
US7516790B2 (en) 1999-12-03 2009-04-14 Enventure Global Technology, Llc Mono-diameter wellbore casing
US20050223535A1 (en) * 2000-10-02 2005-10-13 Cook Robert L Method and apparatus for forming a mono-diameter wellbore casing
US7363691B2 (en) 2000-10-02 2008-04-29 Shell Oil Company Method and apparatus for forming a mono-diameter wellbore casing
US7363690B2 (en) 2000-10-02 2008-04-29 Shell Oil Company Method and apparatus for forming a mono-diameter wellbore casing
US20040250597A1 (en) * 2001-10-29 2004-12-16 Rudolf Bultmann Method and device for production of hollow sections
US7559365B2 (en) 2001-11-12 2009-07-14 Enventure Global Technology, Llc Collapsible expansion cone
US7383889B2 (en) 2001-11-12 2008-06-10 Enventure Global Technology, Llc Mono diameter wellbore casing
US7740076B2 (en) 2002-04-12 2010-06-22 Enventure Global Technology, L.L.C. Protective sleeve for threaded connections for expandable liner hanger
US7918284B2 (en) 2002-04-15 2011-04-05 Enventure Global Technology, L.L.C. Protective sleeve for threaded connections for expandable liner hanger
US7360591B2 (en) 2002-05-29 2008-04-22 Enventure Global Technology, Llc System for radially expanding a tubular member
US7398832B2 (en) 2002-06-10 2008-07-15 Enventure Global Technology, Llc Mono-diameter wellbore casing
US20060162937A1 (en) * 2002-07-19 2006-07-27 Scott Costa Protective sleeve for threaded connections for expandable liner hanger
US7377326B2 (en) 2002-08-23 2008-05-27 Enventure Global Technology, L.L.C. Magnetic impulse applied sleeve method of forming a wellbore casing
US7424918B2 (en) 2002-08-23 2008-09-16 Enventure Global Technology, L.L.C. Interposed joint sealing layer method of forming a wellbore casing
US20090188110A1 (en) * 2002-09-03 2009-07-30 Seok Hwan Moon Micro heat pipe with poligonal cross-section manufactured via extrusion or drawing
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