WO2002035128A2 - Accouplement taraude de tuyaux de type manchon - Google Patents

Accouplement taraude de tuyaux de type manchon Download PDF

Info

Publication number
WO2002035128A2
WO2002035128A2 PCT/EP2001/011574 EP0111574W WO0235128A2 WO 2002035128 A2 WO2002035128 A2 WO 2002035128A2 EP 0111574 W EP0111574 W EP 0111574W WO 0235128 A2 WO0235128 A2 WO 0235128A2
Authority
WO
WIPO (PCT)
Prior art keywords
coupled connection
male
connection according
female
threaded
Prior art date
Application number
PCT/EP2001/011574
Other languages
English (en)
Other versions
WO2002035128A3 (fr
Inventor
Giuseppe Della Pina
Giuseppe Rotini
Angelo Signorelli
Original Assignee
Dalmine S.P.A.
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 Dalmine S.P.A. filed Critical Dalmine S.P.A.
Priority to AU2002221660A priority Critical patent/AU2002221660A1/en
Publication of WO2002035128A2 publication Critical patent/WO2002035128A2/fr
Publication of WO2002035128A3 publication Critical patent/WO2002035128A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface
    • 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
    • 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
    • E21B17/08—Casing joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings

Definitions

  • the present invention relates to a threaded coupled connection with reduced diametral encumbrance for pipes, in particular for pipes used in the natural-gas and oil extraction industry.
  • the said pipes may be used both as tubings for pumping gas, oil or liquefiable hydrocarbons, and as casings for the wells.
  • tubings or casings having a pre-defined length which must be joined together at their ends to form strings, in order to be able to reach the very large depths at which reservoirs of oil, gas, and liquefiable hydrocarbons are located.
  • the most commonly used drilling technique is that of drilling wells that start from the surface of the ground or of the sea until the oil field or gas reservoir is reached. The depth of these wells can attain several thousands of metres.
  • the boreholes are lined with metal tubings or casings throughout their length.
  • the segments of metal tubing, which are each some ten metres long, are joined together by means of threaded joints.
  • These casings then form a tubular string having a constant diameter throughout its length, except at the joints, where the external diameter is generally at least 1 inch (25,4 mm) greater than that of the string itself.
  • this string which has the function of pumping the gas, oil or liquefiable hydrocarbon out of the underground reservoir.
  • This string which is sunk to the entire depth of the well, and which can thus reach lengths of several thousand metres, is also formed by joining pipes each of some ten metres in length by means of joints of the type referred to above.
  • this second type of string has a constant diameter throughout its length, except at the joints, where the external diameter is generally larger, as in the previous case.
  • the pipes are joined together either by threaded integral joints, in which case one end of the pipe, or pin, has a male thread and the other end, a female thread, or by coupled connections, in which case both ends of the pipe, or pins, have a male thread and are joined together by a threaded sleeve or coupling, having female threads at both ends.
  • threaded integral joints in which case one end of the pipe, or pin, has a male thread and the other end, a female thread
  • coupled connections in which case both ends of the pipe, or pins, have a male thread and are joined together by a threaded sleeve or coupling, having female threads at both ends.
  • threaded joints having small diametral dimensions are used. These can be divided into three types according to the features required and the maximum overall dimensions allowed.
  • a first type which is frequently referred to as “semi-flush”, is a coupled connection, the external diameter of which exceeds the external diameter of the pipe by not more than 6%.
  • a second type generally referred to as “near-flush”, is an integral joint, the external diameter of which exceeds that of the pipe by 2-3%.
  • a third type referred to as "flush” is an integral joint, the external diameter of which is equal to the external diameter of the pipe.
  • the joints must also possess excellent characteristics of resistance to screwing and seizing.
  • the US patent US-A-5427418 describes a coupled connection for pipes, in which tightness and a low screwing torque are ensured by shaping the thread so that it has a semi-circular or a triangular profile and ensuring the seal by means of grease trapped in the thread.
  • a joint of this sort can achieve high values of efficiency, it does not have a shoulder designed to protect the joint from possible excess screwing torque, and hence from excessive stresses that would impair its functionality, and, since it is not provided with a metal seal, it does not guarantee a sufficiently efficient tightness in certain operative conditions.
  • the patent US-A-5462315 describes an embodiment of a joint having reduced diametral dimensions, which in one variant of the invention may be a coupled tubing or casing connection.
  • the joint has a central shoulder, which bears, both upon the male side and upon the female side, a projection and a slot parallel to the axis of the pipe, with homologous surfaces and such as to mate perfectly with a blocking function for the two members of the joint.
  • Present on the projections of the shoulder are two sealing surfaces.
  • the shoulder separates two portions of thread, of a conical or conical-cylindrical shape, radially staggered with respect to one another.
  • a primary purpose of the present invention is consequently that of overcoming the drawbacks referred to above, which are presented by the aforementioned joints for pipes, by providing a new joint of the semi-flush type which, given the same overall dimensions as compared to those of other joints of the prior art, does not present the disadvantages mentioned previously.
  • a particular purpose of the present invention is to provide a coupled connection with limited diametral encumbrance, which has a reduced production cost, at the same time guaranteeing high values of strength and tightness when assembled.
  • a further purpose of the present invention is to provide a shape that facilitates installation.
  • a threaded coupled connection for pipes which, in accordance with Claim 1 , comprises two male tubular members that are coaxial when assembled, each provided, on its outer surface, with a portion having a frustoconical shape, tapered in the direction of its own end and provided with a thread, and a female tubular member coaxial to the male members and provided on its inner surface with two frustoconical portions provided with a thread, set on opposite sides with respect to a central plane orthogonal to the axis and tapered in the direction of said central plane, each of said male tubular members having at least two sealing surfaces co-operating with corresponding sealing surfaces of said female tubular member, which they face once the pipes have been mounted, and forming together pairs of sealing surfaces, the said threaded joint being characterised in that one first of said pairs of sealing surfaces is set in a position corresponding to the end portion of said male tubular members and in the vicinity of the central region of said female tubular member, thus obtaining a seal in regard to the internal environment
  • the joint enables facilitated installation of the tubular string, with reduced risks of damage to the pipes at the joints, at the same time guaranteeing a high strength of the tubular string in said regions both during installation and during operation.
  • Fig. 1 represents a sectional view in an axial plane of one part of the connection according to the invention, with two of the three component members in a detached position;
  • Fig. 2 represents an overall view of the entire joint, with the three component members in a joined position ;
  • Fig. 3 represents an enlargement of a detail of the profile of the thread of the connection illustrated in Fig. 1. Means of putting the invention in hand
  • the coupled connection comprises three members: two pipes, 1 ', 1", the pin members of the connection, and a coupling 2, with two female end portions, the box member of the connection. Since the latter are arranged symmetrically, the coupled connection may be examined considering just one of the two ends, on which there is thus present the pin 1 ' and the box 2.
  • the coupled connection defines an internal part 20 of the pipe in which the fluid, for example natural gas or oil or a similar fluid, flows, and an external part 30 which may also be filled with fluids, either gases or liquids, of various nature, which are also generally under pressure.
  • the external diameter 3 of the muff 2 in the area of maximum diameter, of length D', of the coupled connection is slightly greater than the external diameter 4 of the pipe 1 ' in the cylindrical central part distant from the coupled connection, of length D".
  • the length D' of the diameter 3 is greater than the length D" of the diameter 4 by a value generally not higher than 6%.
  • the female member 2 of the coupled connection has an internal thread 7 with a conical generatrix with respect to the axis of the pipe and with tapering in the direction of its central part.
  • the thread may be perfect throughout its length, or else may have a portion with an imperfect thread 7'. In the embodiment illustrated in Figures 1 and 2, this portion is set at the internal end of the thread of the box 2.
  • the thread has a conicity of equal degree and of a value of between 6,25% and 12,5%.
  • the range indicated above is optimal because, on the one hand, the choice of lower values would entail making threads that are excessively long, particularly in the case of large thicknesses, with the consequence that it becomes difficult to get the male parts to enter the female part, and, on the other hand, the choice of higher values would mean that too few teeth would be available in the threaded portion, and hence the thread would have an insufficient bearing value.
  • the box 2 has, at the end of the thread 7, which is set inside it, an annular shoulder 5" set on a plane inclined with respect to the axis of the pipe at a negative angle ⁇ having a value of between -5° and -10°. The choice of these values is advantageous because a negative angle of the shoulder favours proper engagement of the sealing surface of the male part and the female part.
  • the box 2 has, in the connecting region between the threaded portion and the shoulder 5", a region 10" with conical surface with respect to the axis of the pipe.
  • the conicity of this surface is between 12,5% and 25% in order to guarantee a good seal with the corresponding contact surface of the male part, reducing the length of sliding during the screwing step.
  • the box 2 is provided with a spherical surface 11", which, in its contact with a conical region 11 ', which it faces after being screwed together with the pin 1 , guarantees tightness against the external pressure.
  • the surface 11 " can also be produced with a conical shape.
  • the profile of the tooth of the thread is of the "hooked" type, with the load flank 8 at a negative angle ⁇ with values of between 0° and -10° and with the lead-in flank 9 with a positive angle ⁇ of between 10° and 45°.
  • a load flank with a negative angle enables an effective mating of the two members of the coupled connection and reduces the possibility of opening and separation of the coupled connection on account of high tensile loads.
  • a lead-in flank with a positive angle of a value which is not high and is close to the bottom limit of said range of values enables effective participation of the thread in the resistance to compression loads.
  • the pin 1 ' has, in the area of the outer surface which faces the threaded region of the box, a thread 6 set in a perfectly reciprocal way, with portions shaped in a perfectly analogous manner.
  • connection region between the external surface of the member 1 ' and the start of the threaded portion 65 has a conical surface 11 ' with values of conicity of between 12,5% and 25%.
  • This surface presses against the surface 11 ", which is conical or spherical according to the embodiment, after screwing of the coupled connection, and the dimensions and tolerances are chosen in such a way that the metal-metal contact guarantees a tightness that will prevent any liquid or gas under pressure that may be outside the coupled connection from penetrating.
  • the pin 1 ' has a surface 10' of a conical shape, which, after screwing with the box 2, comes to press against the conical surface 10" of the box. Also in this second region, there is produced a metal-metal contact pressure between the two members, which creates a seal against the pressure of the fluid present inside the pipe.
  • the sealing surface 10' at the end of the pin member 1 ' is of a spherical shape.
  • the choice of a region at the end of the coupled connection where the metal seal is produced, which has facing surfaces having a spherical and conical shape, in accordance with the invention renders the coupled connection less sensitive to the pressure loads that act upon it, and has proved optimal for pipes of large diameter.
  • the pressure outside the pipe, acting on the aforesaid end is very likely to cause its deflection.
  • a spherical sealing surface is able to maintain even so an optimal contact, as compared to a seal of the truncated-cone type, which in this case, on account of the rotation imposed by the deflection of the end, fails to maintain the contact over the entire sealing band.
  • the pipe 1 ' has an annular shoulder 5' set in a plane inclined with respect to the axis of the pipe by the same angle as that of the homologous shoulder 5" on box 2. After screwing of the pin and box members together, the shoulder 5" of the box 2 comes to rest against the end face 5' of the pin 1 '.
  • the shape of the teeth of the thread of the pin members 1 ', 1" is the same as that of the thread of the box member 2, referred to above.
  • the thread has a perfect profile throughout its length.
  • the end region 6' of the end of the portion of thread 6 of the pin in the proximity of the annular sealing surface 11 ', has a thread with a non-perfect profile.
  • the corresponding region 7 of the box on the side 11 ", which is set facing the portion 6' has a perfect thread.
  • the region 7' at the opposite end of the threaded portion 7, i.e., the region in the vicinity of the sealing surface 10" may also itself have a thread with a non- perfect profile, and the corresponding portion of thread 6 of the pin member facing it has a perfect thread.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Dowels (AREA)
  • Gasket Seals (AREA)

Abstract

Un manchon taraudé pour tuyaux comprend deux broches (1', 1') pourvues d'une partie taraudée (6) de forme tronconique et d'un manchon (2) à deux parties taraudées (7) de forme tronconique. Sur l'une des broches (1', 1') et sur le manchon (2) sont formées deux surfaces d'about (5', 5') de forme annulaire et inclinées selon un angle (δ) par rapport à l'axe des tuyaux (1', 1'), et deux paires de surfaces d'étanchéité (10', 10', 11', 11') dont la première paire (10', 10') est formée à l'extrémité des broches (1', 1') et forme un joint d'étanchéité par rapport à l'environnement interne, et dont la seconde paire (11', 11'), à l'extrémité opposée des parties taraudées (6, 7) de la région d'extrémité du manchon (2), forme un joint d'étanchéité par rapport à l'environnement externe des tuyaux.
PCT/EP2001/011574 2000-10-26 2001-10-08 Accouplement taraude de tuyaux de type manchon WO2002035128A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002221660A AU2002221660A1 (en) 2000-10-26 2001-10-08 Threaded pipe joint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2000A002325 2000-10-26
IT2000MI002325A IT1319028B1 (it) 2000-10-26 2000-10-26 Giunzione filettata per tubi di tipo manicottato

Publications (2)

Publication Number Publication Date
WO2002035128A2 true WO2002035128A2 (fr) 2002-05-02
WO2002035128A3 WO2002035128A3 (fr) 2002-07-25

Family

ID=11446046

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/011574 WO2002035128A2 (fr) 2000-10-26 2001-10-08 Accouplement taraude de tuyaux de type manchon

Country Status (4)

Country Link
AR (1) AR030993A1 (fr)
AU (1) AU2002221660A1 (fr)
IT (1) IT1319028B1 (fr)
WO (1) WO2002035128A2 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2325435B1 (fr) 2009-11-24 2012-10-24 Tenaris Connections Limited Joint fileté étanche à des pressions internes et externes [extrêmement hautes]
CN102926674A (zh) * 2011-08-11 2013-02-13 中国石油天然气集团公司 低压用气密封特殊螺纹接头
CN103696705A (zh) * 2013-12-16 2014-04-02 天津商业大学 偏梯形特殊扣螺纹石油套管螺纹过盈量控制方法
CN104074472A (zh) * 2014-07-22 2014-10-01 江苏和信石油机械有限公司 超抗扭多台肩的全密封锥管螺纹连接装置
CN104074473A (zh) * 2014-07-22 2014-10-01 江苏和信石油机械有限公司 用于超深油气井钻探的钻杆连接装置
US9644248B2 (en) 2013-04-08 2017-05-09 Dalmine S.P.A. Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US9657365B2 (en) 2013-04-08 2017-05-23 Dalmine S.P.A. High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US9803256B2 (en) 2013-03-14 2017-10-31 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US9970242B2 (en) 2013-01-11 2018-05-15 Tenaris Connections B.V. Galling resistant drill pipe tool joint and corresponding drill pipe
EP3234298B1 (fr) 2014-12-19 2019-05-01 Vallourec Oil And Gas France Raccord fileté
US11105501B2 (en) 2013-06-25 2021-08-31 Tenaris Connections B.V. High-chromium heat-resistant steel
US11124852B2 (en) 2016-08-12 2021-09-21 Tenaris Coiled Tubes, Llc Method and system for manufacturing coiled tubing
US11952648B2 (en) 2011-01-25 2024-04-09 Tenaris Coiled Tubes, Llc Method of forming and heat treating coiled tubing

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2006589B1 (fr) 2007-06-22 2011-08-31 Tenaris Connections Aktiengesellschaft Joint fileté avec étanchéité énergisable
EP2017507B1 (fr) 2007-07-16 2016-06-01 Tenaris Connections Limited Joint fileté avec bague d'étanchéité souple
EP2243920A1 (fr) 2009-04-22 2010-10-27 Tenaris Connections Aktiengesellschaft Joint fileté pour tubes, tuyaux et similaires
EP2372211B1 (fr) 2010-03-26 2015-06-03 Tenaris Connections Ltd. Raccord de tuyau à paroi mince et méthode pour coupler un premier tuyau à un second tuyau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109672A (en) * 1960-02-15 1963-11-05 United States Steel Corp Threaded tubing joint
US4153283A (en) * 1976-09-14 1979-05-08 Mannesmann Aktiengesellschaft Casing joint
US4377302A (en) * 1981-05-14 1983-03-22 Nippon Steel Corporation Threaded joint with high gas-leak-tightness for oil and gas well pipe
US5360239A (en) * 1989-07-28 1994-11-01 Antares Marketing, S.A. Threaded tubular connection
EP0703396A1 (fr) * 1994-09-23 1996-03-27 Sumitomo Chemical Company, Limited Raccord à vis pour tuyaux de l'extraction du pétrole
EP0916883A1 (fr) * 1997-05-30 1999-05-19 Sumitomo Metal Industries Limited Joint a vis pour tuyau de puits de petrole

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109672A (en) * 1960-02-15 1963-11-05 United States Steel Corp Threaded tubing joint
US4153283A (en) * 1976-09-14 1979-05-08 Mannesmann Aktiengesellschaft Casing joint
US4377302A (en) * 1981-05-14 1983-03-22 Nippon Steel Corporation Threaded joint with high gas-leak-tightness for oil and gas well pipe
US5360239A (en) * 1989-07-28 1994-11-01 Antares Marketing, S.A. Threaded tubular connection
EP0703396A1 (fr) * 1994-09-23 1996-03-27 Sumitomo Chemical Company, Limited Raccord à vis pour tuyaux de l'extraction du pétrole
EP0916883A1 (fr) * 1997-05-30 1999-05-19 Sumitomo Metal Industries Limited Joint a vis pour tuyau de puits de petrole

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10844669B2 (en) 2009-11-24 2020-11-24 Tenaris Connections B.V. Threaded joint sealed to internal and external pressures
EP2325435B1 (fr) 2009-11-24 2012-10-24 Tenaris Connections Limited Joint fileté étanche à des pressions internes et externes [extrêmement hautes]
US11952648B2 (en) 2011-01-25 2024-04-09 Tenaris Coiled Tubes, Llc Method of forming and heat treating coiled tubing
CN102926674A (zh) * 2011-08-11 2013-02-13 中国石油天然气集团公司 低压用气密封特殊螺纹接头
CN102926674B (zh) * 2011-08-11 2015-12-02 中国石油天然气集团公司 低压用气密封特殊螺纹接头
US9970242B2 (en) 2013-01-11 2018-05-15 Tenaris Connections B.V. Galling resistant drill pipe tool joint and corresponding drill pipe
US10378075B2 (en) 2013-03-14 2019-08-13 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US9803256B2 (en) 2013-03-14 2017-10-31 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US10378074B2 (en) 2013-03-14 2019-08-13 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US11377704B2 (en) 2013-03-14 2022-07-05 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US9657365B2 (en) 2013-04-08 2017-05-23 Dalmine S.P.A. High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US9644248B2 (en) 2013-04-08 2017-05-09 Dalmine S.P.A. Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US11105501B2 (en) 2013-06-25 2021-08-31 Tenaris Connections B.V. High-chromium heat-resistant steel
CN103696705A (zh) * 2013-12-16 2014-04-02 天津商业大学 偏梯形特殊扣螺纹石油套管螺纹过盈量控制方法
CN104074473A (zh) * 2014-07-22 2014-10-01 江苏和信石油机械有限公司 用于超深油气井钻探的钻杆连接装置
CN104074472A (zh) * 2014-07-22 2014-10-01 江苏和信石油机械有限公司 超抗扭多台肩的全密封锥管螺纹连接装置
EP3234298B1 (fr) 2014-12-19 2019-05-01 Vallourec Oil And Gas France Raccord fileté
US11124852B2 (en) 2016-08-12 2021-09-21 Tenaris Coiled Tubes, Llc Method and system for manufacturing coiled tubing

Also Published As

Publication number Publication date
ITMI20002325A1 (it) 2002-04-26
AU2002221660A1 (en) 2002-05-06
WO2002035128A3 (fr) 2002-07-25
AR030993A1 (es) 2003-09-03
IT1319028B1 (it) 2003-09-19

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