EP0875661A1 - Method for moving equipment in a well system - Google Patents

Method for moving equipment in a well system Download PDF

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Publication number
EP0875661A1
EP0875661A1 EP97201266A EP97201266A EP0875661A1 EP 0875661 A1 EP0875661 A1 EP 0875661A1 EP 97201266 A EP97201266 A EP 97201266A EP 97201266 A EP97201266 A EP 97201266A EP 0875661 A1 EP0875661 A1 EP 0875661A1
Authority
EP
European Patent Office
Prior art keywords
equipment
well system
well
production
entrance
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97201266A
Other languages
German (de)
English (en)
French (fr)
Inventor
Johannis Josephus Den Boer
Hugh Edward Sheehy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
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 Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP97201266A priority Critical patent/EP0875661A1/en
Priority to EG41998A priority patent/EG21404A/xx
Priority to ARP980101900 priority patent/AR012500A1/es
Priority to CA002285476A priority patent/CA2285476C/en
Priority to AU77607/98A priority patent/AU730212B2/en
Priority to PCT/EP1998/002578 priority patent/WO1998049424A1/en
Priority to EP98925514A priority patent/EP0980463A1/en
Priority to IDW991280A priority patent/ID22927A/id
Priority to EA199900978A priority patent/EA000922B1/ru
Priority to CN98804394A priority patent/CN1091833C/zh
Publication of EP0875661A1 publication Critical patent/EP0875661A1/en
Priority to NO995247A priority patent/NO995247L/no
Priority to OA9900237A priority patent/OA11210A/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well

Definitions

  • the invention relates to a method for moving equipment into, through and/or from a well system for the production of hydrocarbon fluids and to a well system in which the method can be applied.
  • An object of the present invention is to provide a method for moving equipment into, through and/or from a well system for the production of hydrocarbon fluids which allows an easy and safe access to the well system at any time and which results in but lower production losses.
  • a method for moving equipment into, through and/or from a well system for the production of hydrocarbon fluids which well system comprises a plurality of entrance points at or near the earth surface and a system of one or more underground wellbores which provide a subsurface connection between said entrance points, the method comprising moving equipment into, through and/or from the well system via a first of said entrance points whilst production of hydrocarbon fluids takes place via another entrance point during at least part of the period that the equipment is moved into, through and/or from the well system.
  • said first and any other entrance points are wellheads of hydrocarbon fluid production wells and the production of hydrocarbon fluids via the wellhead that forms the first of said entrance points is interrupted or minimized during at least part of the period that the equipment is moved into, through and/or from the well system.
  • the first of said entrance points is a dedicated equipment launch and retrieval point not used for normal production operations.
  • the equipment comprises drilling, services, monitoring and/or control equipment which is moved through the well system by carrier means which are connected to surface power supply and/or control facilities via an electrical, fibre optical, hydraulic, or other umbilical conduit which passes through the first of said entrance points.
  • the carrier means optionally comprises plugging equipment which temporarily provides a plug which blocks or reduces flow of fluids from the well system towards the first of said entrance points during at least part of the period that the carrier means and/or other equipment are used in or moved into, through or from the well system.
  • the well system comprises a plurality of entrance points at or near the earth surface and a system of underground wellbores which provides a subsurface connection between said entrance points, wherein at least a first of said entrance points is provided with means for moving equipment into, through and/or from the well system whilst production of hydrocarbon fluids takes place via another entrance point during at least part of the period that the equipment is moved into, through and/or from the well system.
  • the invention also relates to a method for the phased development of such a well system.
  • the method comprises drilling and completing a hydrocarbon fluid production well via a well entrance point at or near the earth surface and initiating the production of hydrocarbon fluids via that entrance point; and subsequently drilling another well via another entrance point at or near the earth surface such that the wellbores of the wells intersect and form a subsurface corridor via which equipment can be moved, wherein production of hydrocarbon fluids via the already completed well continues during at least part of the period that the other well is being drilled and/or completed.
  • the process of drilling further wellbores may continue after completion of said other well whilst production via at least one entrance point continues.
  • US patent specification No. 4,283,088 discloses the use of an underground working tunnel and workings from where heat injection and oil production wells are drilled into a viscous oil bearing formation by mining personnel operating in the tunnel and workings.
  • the tunnel and workings are ventilated and perform as a subsurface work area from which a series of generally upwardly oriented heat injection and oil production wells are drilled.
  • the tunnel and workings therefore do not form part of the well system itself.
  • the well system comprises a first wellhead 1 and a second wellhead 2.
  • the wellheads 1 and 2 are located at the earth surface 3 and interconnected via a system of underground wellbores.
  • the system of wellbores comprises of a first and a second vertical wellbore 4 and 5 and a pair of substantially horizontal wellbores 6 and 7, which interconnect the vertical wellbores 4 and 5 at different depths.
  • a pair of wellbranches 8 and 9 have been drilled from the first vertical wellbore 4 and a pair of wellbranches 10 and 11 have been drilled from the upper horizontal wellbore 6.
  • the well system traverses upper and lower oil and/or gas bearing formations 12 and 13 that are shown in the drawing as shaded areas. Inflow of oil and/or gas into the well system takes place at inflow zones 14 and 15 which are depicted in the drawing as dark shaded areas.
  • inflow zones 14 and 15 could each be separate oil and/or gas reservoirs.
  • the well system is equipped with a series of valves 16 which in the illustration shown are closed and thereby prevent inflow of oil and/or gas into the first vertical wellbore 4 towards the first wellhead 1.
  • a service equipment carrier tool 17 has been lowered into the lower horizontal wellbore 7.
  • the tool 17 is connected to power and control means (not shown) at the earth surfaces 3 via an umbilical cable 18 which has been reeled into the well system from a reeling drum 19.
  • the first wellhead 1 is provided with a lubricator 20 which provides a fluid tight seal around the umbilical cable 18.
  • the configuration shown allows production of oil and/or gas to continue via the inflow regions 14 and the second vertical wellbore 5 towards the second wellhead 2 as illustrated by the black areas in the well system and arrows 21 while the equipment carrier tool 17 and the equipment carried thereby is moved via the first wellhead 1 into, through and from the well system.
  • the service equipment carried by the carrier tool 17 may consist of logging, cleaning, maintenance, inspection drilling and/or other equipment which can be used downhole over prolonged periods while production via the second wellhead 2 continues.
  • the equipment can be used both during well completion and production operations, for example for well inspection and maintenance, production monitoring (including well logging) and well inflow control, transportation of components into and from the well system, deployment of sensors and for the assembly and disassembly of downhole equipment.
  • the tool 17 may be equipped with wheels or other propulsion means (not shown) and a nose section which comprises an expandable seal and which is secured to the tool body as an axially slidable plunger so that the tool can propel itself forward as a kind of inchworm into a wellsection which has not yet been isolated by a valve or other flow stopper.
  • carrier tool 17 may itself be used to install or set valves 16 or sealing plugs at branch points or other locations where a temporary or permanent flow interruption is required.
  • the tool may be lowered into the well system by mounting the drum 19 and lubricator 20 on top of the second wellhead 2.
  • production from the lower horizontal wellbore 7 and the wellbranches 8 and 9 may continue via the first wellhead 1.
  • the tool may contain its own power supply and a wireless data transmission link.
  • power and or data transmission may be facilitated by transmitting an electromagnetic field via the well tubing or casing or a conductor which is permanently embedded in the well and by providing the tool 17 with an inductive coupler which serves as a movable electrical contact.
  • the absence of an umbilical 18 would obviate the need for the reeling drum 19 and lubricator 20 and in such case the tool 17 can be inserted into the well system by sluices (not shown) in the wellheads 1 and 2.
  • the well system may be provided with a series of downhole base points (not shown).
  • Such downhole base points may be formed by areas where the wellbore and/or production tubing inside the wellbore has an enlarged diameter or side pocket which serves as a dock-in station for the tool 17 and/or the equipment carried thereby during periods when they are not in use.
  • the downhole base point may be provided with dedicated links for power and communication to the surface 3. If the tool 17 and equipment are powered by batteries, the batteries can be rechanged at the base point or points. If the tool 17 and/or equipment comprise sensors and a memory for storing data gathered then the data thus gathered can be unloaded at a base point and transmitted to data processing equipment at the surface. In such case the tool 17 itself may be used to as a shuttle that reloads batteries of permanently installed sensors or other equipment in the vicinity of a base point and to unload data collected thereby and sequentially transmit such data to the surface. Furthermore the batteries of the tool itself may be used to provide power downhole, for example to set a valve or to actuate a drilling or other device.
  • the use of the method and well system according to the invention is not limited to a well system with two wellheads 1 and 2 where production via one of the wellheads 2 can be continued whilst service operations are carried out via the other wellhead 1.
  • the well system may also comprise three or more wellheads and only one of the wellheads may be equipped with launch and sluice means for launching equipment into the well system.
  • This wellhead may for example be located at the deck of an offshore platform and be a dedicated entry point for launching equipment into the well system and for manipulating the equipment downhole, whilst no oil and/or gas is produced via this entry point during normal operations.
  • the other wellheads of such a well system could be arranged subsea and produce oil and/or gas towards production facilities at the platform.
  • the well system can be developed in phases.
  • the well system shown in the drawing may initially be developed by drilling the second vertical well-bore 5 and the lower horizontal wellbore 7.
  • first wellbore 4 is drilled and linked to the horizontal wellbores 6 and 7 such that these sections provide a downhole corridor between the vertical wellbores 4 and 5 through which equipment can be moved.
  • the wellsystem can be further expanded by using re-entry drilling techniques where the equipment is moved into and from the wellsystem via one of the wellheads 1 or 2 whilst production via the other wellhead 1 or 2 continues.
  • the well system may also comprise a pair of parallel or co-axial tubings in a single vertical well, which tubings are interconnected downhole via a wellbore that forms a closed loop from and towards the vertical well. If in such case the well is equipped with co-axial tubings it may generally be desirable to use the inner tubing for the transport of the carrier tool and/or other equipment into and from the well system and to use the surrounding tubing or tubings for the production of oil and/or gas.
EP97201266A 1997-04-28 1997-04-28 Method for moving equipment in a well system Withdrawn EP0875661A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP97201266A EP0875661A1 (en) 1997-04-28 1997-04-28 Method for moving equipment in a well system
EG41998A EG21404A (en) 1997-04-28 1998-04-18 Method for moving equipment in a well system
ARP980101900 AR012500A1 (es) 1997-04-28 1998-04-24 Metodo para usar un equipo en un conjunto de pozos y conjunto de pozos que lo utiliza
PCT/EP1998/002578 WO1998049424A1 (en) 1997-04-28 1998-04-27 Using equipment in a well system
AU77607/98A AU730212B2 (en) 1997-04-28 1998-04-27 Using equipment in a well system
CA002285476A CA2285476C (en) 1997-04-28 1998-04-27 Using equipment in a well system
EP98925514A EP0980463A1 (en) 1997-04-28 1998-04-27 Using equipment in a well system
IDW991280A ID22927A (id) 1997-04-28 1998-04-27 Penggunaan peralatan dalam sistem sumur
EA199900978A EA000922B1 (ru) 1997-04-28 1998-04-27 Способ использования оборудования в системе скважин, система скважин и способ ее пофазной разработки
CN98804394A CN1091833C (zh) 1997-04-28 1998-04-27 井眼系统、在井眼系统中应用的设备的方法和开发井眼系统的方法
NO995247A NO995247L (no) 1997-04-28 1999-10-27 Benyttelse av utstyr i et brönnsystem
OA9900237A OA11210A (en) 1997-04-28 1999-10-28 Using equipment in a well system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97201266A EP0875661A1 (en) 1997-04-28 1997-04-28 Method for moving equipment in a well system

Publications (1)

Publication Number Publication Date
EP0875661A1 true EP0875661A1 (en) 1998-11-04

Family

ID=8228268

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97201266A Withdrawn EP0875661A1 (en) 1997-04-28 1997-04-28 Method for moving equipment in a well system
EP98925514A Withdrawn EP0980463A1 (en) 1997-04-28 1998-04-27 Using equipment in a well system

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP98925514A Withdrawn EP0980463A1 (en) 1997-04-28 1998-04-27 Using equipment in a well system

Country Status (11)

Country Link
EP (2) EP0875661A1 (es)
CN (1) CN1091833C (es)
AR (1) AR012500A1 (es)
AU (1) AU730212B2 (es)
CA (1) CA2285476C (es)
EA (1) EA000922B1 (es)
EG (1) EG21404A (es)
ID (1) ID22927A (es)
NO (1) NO995247L (es)
OA (1) OA11210A (es)
WO (1) WO1998049424A1 (es)

Cited By (21)

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WO2000031376A2 (en) * 1998-11-20 2000-06-02 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6412556B1 (en) 2000-08-03 2002-07-02 Cdx Gas, Inc. Cavity positioning tool and method
US6425448B1 (en) 2001-01-30 2002-07-30 Cdx Gas, L.L.P. Method and system for accessing subterranean zones from a limited surface area
WO2002061238A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing a subterranean zone from a limited surface area
US6454000B1 (en) 1999-11-19 2002-09-24 Cdx Gas, Llc Cavity well positioning system and method
US6598686B1 (en) 1998-11-20 2003-07-29 Cdx Gas, Llc Method and system for enhanced access to a subterranean zone
US6679322B1 (en) 1998-11-20 2004-01-20 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6681855B2 (en) 2001-10-19 2004-01-27 Cdx Gas, L.L.C. Method and system for management of by-products from subterranean zones
US6708764B2 (en) 2002-07-12 2004-03-23 Cdx Gas, L.L.C. Undulating well bore
US6725922B2 (en) 2002-07-12 2004-04-27 Cdx Gas, Llc Ramping well bores
WO2005003509A1 (en) * 2003-06-30 2005-01-13 Petroleo Brasileiro S A-Petrobras Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids
WO2007057378A1 (en) * 2005-11-16 2007-05-24 Shell Internationale Research Maatschappij B.V. Wellbore system
US8291974B2 (en) 1998-11-20 2012-10-23 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8333245B2 (en) 2002-09-17 2012-12-18 Vitruvian Exploration, Llc Accelerated production of gas from a subterranean zone
CN102900404A (zh) * 2012-11-01 2013-01-30 中国海洋石油总公司 气藏之间建立裸眼式人造运移通道开发的方法
CN102900403A (zh) * 2012-11-01 2013-01-30 中国海洋石油总公司 气藏之间建立人造天然气运移通道的方法
CN102913205A (zh) * 2012-11-01 2013-02-06 中国海洋石油总公司 气藏之间建立裸眼砾石充填式人造运移通道开发的方法
US8376052B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for surface production of gas from a subterranean zone
US8376039B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8434568B2 (en) 1998-11-20 2013-05-07 Vitruvian Exploration, Llc Method and system for circulating fluid in a well system
CN106545296A (zh) * 2016-12-02 2017-03-29 淮北矿业股份有限公司 一种深采煤层底板灰岩水害的地面钻孔注浆治理方法

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EP1184538A1 (en) * 2000-09-04 2002-03-06 Shell Internationale Researchmaatschappij B.V. System for downhole separation
US20060124360A1 (en) * 2004-11-19 2006-06-15 Halliburton Energy Services, Inc. Methods and apparatus for drilling, completing and configuring U-tube boreholes
CN102434144A (zh) * 2011-11-16 2012-05-02 中国石油集团长城钻探工程有限公司 一种油田用“u”形井采油方法
WO2013105969A1 (en) * 2012-01-13 2013-07-18 Landmark Graphics Corporation Method and system of planning and/or drilling wellbores
CA2865786C (en) 2012-03-02 2016-09-20 Halliburton Energy Services, Inc. Subsurface well systems with multiple drain wells extending from a production well and methods for use thereof
CN103362442B (zh) * 2012-03-30 2016-01-13 刘洪斌 钻井多点连通循环采集地热法
CN102606129B (zh) * 2012-04-10 2014-12-10 中国海洋石油总公司 一种薄互层油田开发方法及系统
AU2012396842B2 (en) * 2012-12-13 2016-02-04 Halliburton Energy Services, Inc. Assembly and method for subsea hydrocarbon gas recovery
CN103615224B (zh) * 2013-11-08 2016-02-10 中国石油天然气股份有限公司 溶剂改善蒸汽辅助重力泄油开采稠油藏的方法及井网结构
WO2016144943A1 (en) * 2015-03-09 2016-09-15 Saudi Arabian Oil Company Activating a well system tool

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Cited By (46)

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US8371399B2 (en) 1998-11-20 2013-02-12 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US9551209B2 (en) 1998-11-20 2017-01-24 Effective Exploration, LLC System and method for accessing subterranean deposits
US6357523B1 (en) 1998-11-20 2002-03-19 Cdx Gas, Llc Drainage pattern with intersecting wells drilled from surface
US8813840B2 (en) 1998-11-20 2014-08-26 Efective Exploration, LLC Method and system for accessing subterranean deposits from the surface and tools therefor
US8511372B2 (en) 1998-11-20 2013-08-20 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface
US8505620B2 (en) 1998-11-20 2013-08-13 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8479812B2 (en) 1998-11-20 2013-07-09 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6439320B2 (en) 1998-11-20 2002-08-27 Cdx Gas, Llc Wellbore pattern for uniform access to subterranean deposits
US8469119B2 (en) 1998-11-20 2013-06-25 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6478085B2 (en) 1998-11-20 2002-11-12 Cdx Gas, Llp System for accessing subterranean deposits from the surface
US6561288B2 (en) 1998-11-20 2003-05-13 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6575235B2 (en) 1998-11-20 2003-06-10 Cdx Gas, Llc Subterranean drainage pattern
US6598686B1 (en) 1998-11-20 2003-07-29 Cdx Gas, Llc Method and system for enhanced access to a subterranean zone
US6604580B2 (en) 1998-11-20 2003-08-12 Cdx Gas, Llc Method and system for accessing subterranean zones from a limited surface area
US8464784B2 (en) 1998-11-20 2013-06-18 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6668918B2 (en) 1998-11-20 2003-12-30 Cdx Gas, L.L.C. Method and system for accessing subterranean deposit from the surface
US8434568B2 (en) 1998-11-20 2013-05-07 Vitruvian Exploration, Llc Method and system for circulating fluid in a well system
US8376039B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6688388B2 (en) 1998-11-20 2004-02-10 Cdx Gas, Llc Method for accessing subterranean deposits from the surface
US8376052B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for surface production of gas from a subterranean zone
WO2000031376A2 (en) * 1998-11-20 2000-06-02 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6732792B2 (en) 1998-11-20 2004-05-11 Cdx Gas, Llc Multi-well structure for accessing subterranean deposits
US8316966B2 (en) 1998-11-20 2012-11-27 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
WO2000031376A3 (en) * 1998-11-20 2001-01-04 Cdx Gas Llc Method and system for accessing subterranean deposits from the surface
US6679322B1 (en) 1998-11-20 2004-01-20 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US8291974B2 (en) 1998-11-20 2012-10-23 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US8297350B2 (en) 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface
US8297377B2 (en) 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6454000B1 (en) 1999-11-19 2002-09-24 Cdx Gas, Llc Cavity well positioning system and method
US6412556B1 (en) 2000-08-03 2002-07-02 Cdx Gas, Inc. Cavity positioning tool and method
WO2002061233A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing subterranean zones from a limited surface area
WO2002061238A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing a subterranean zone from a limited surface area
US6662870B1 (en) 2001-01-30 2003-12-16 Cdx Gas, L.L.C. Method and system for accessing subterranean deposits from a limited surface area
US6425448B1 (en) 2001-01-30 2002-07-30 Cdx Gas, L.L.P. Method and system for accessing subterranean zones from a limited surface area
US6681855B2 (en) 2001-10-19 2004-01-27 Cdx Gas, L.L.C. Method and system for management of by-products from subterranean zones
US6708764B2 (en) 2002-07-12 2004-03-23 Cdx Gas, L.L.C. Undulating well bore
US6725922B2 (en) 2002-07-12 2004-04-27 Cdx Gas, Llc Ramping well bores
US8333245B2 (en) 2002-09-17 2012-12-18 Vitruvian Exploration, Llc Accelerated production of gas from a subterranean zone
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WO1998049424A1 (en) 1998-11-05
EP0980463A1 (en) 2000-02-23
CA2285476A1 (en) 1998-11-05
ID22927A (id) 1999-12-16
OA11210A (en) 2003-07-18
EA199900978A1 (ru) 2000-06-26
NO995247L (no) 1999-11-17
NO995247D0 (no) 1999-10-27
AR012500A1 (es) 2000-10-18
EG21404A (en) 2001-10-31
EA000922B1 (ru) 2000-06-26
AU730212B2 (en) 2001-03-01
AU7760798A (en) 1998-11-24
CN1091833C (zh) 2002-10-02
CA2285476C (en) 2006-11-21
CN1252851A (zh) 2000-05-10

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