US20050097911A1 - [downhole tools with a stirling cooler system] - Google Patents
[downhole tools with a stirling cooler system] Download PDFInfo
- Publication number
- US20050097911A1 US20050097911A1 US10/710,103 US71010304A US2005097911A1 US 20050097911 A1 US20050097911 A1 US 20050097911A1 US 71010304 A US71010304 A US 71010304A US 2005097911 A1 US2005097911 A1 US 2005097911A1
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- US
- United States
- Prior art keywords
- stirling cooler
- downhole tool
- insulating chamber
- downhole
- heat
- 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.)
- Abandoned
Links
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/001—Cooling arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
- E21B47/0175—Cooling arrangements
Definitions
- This invention relates generally to techniques for maintaining downhole tools and their components within a desired temperature range in high-temp environments, and, more specifically, to a Stirling-Cycle cooling system for use with downhole tools.
- a downhole tool comprising a number of emitting sources and sensors for measuring various parameters, may be lowered into a borehole on the end of a cable, a wireline, or a drill string.
- the cable/wireline which is attached to some sort of mobile processing center at the surface, provides the means by which data are sent up to the surface. With this type of wireline logging, it becomes possible to measure borehole and formation parameters as a function of depth, i.e., while the tool is being pulled uphole.
- LWD Logging While Drilling
- LWT Logging While Tripping
- FIG. 1 shows a conventional logging tool 12 disposed in a borehole 11 that penetrates a subsurface formation 10 .
- the logging tool 12 may be deployed on a wireline 13 via a wireline control mechanism 14 .
- the logging tool 12 may be connected to surface equipment 15 , which may include a computer (not shown).
- Downhole tools are exposed to extreme temperatures (up to 260° C.) and pressures (up to 30,000 psi and possibly up to 40,000 psi in some instances). These tools are typically equipped with sensitive components (e.g. electronics packages) that often are not designed for such harsh environments. The trend among manufacturers of electronic components is to address the high-volume commercial market, making it difficult to find components for downhole tools that function effectively at these elevated temperatures. At the same time, the oilfield industry is moving toward the exploration of deeper and hotter reservoirs. As a result, there is an urgent need for methods or devices that permit the sensitive electronic components to be operated at high temperatures.
- sensitive components e.g. electronics packages
- a cooling system capable of providing multi-watt refrigeration for thermally protected electronic components in downhole tools would enable the use of electronic and sensor technologies that are otherwise not suitable for high temperature applications. This would reduce the ever-increasing costs associated with the development and implementation of high-temperature electronics, and make it possible to introduce new technologies to subsurface exploration and production.
- a cooling system for use in a downhole tool needs to fit in the limited space within the tool.
- Several miniature cooling systems suitable for use in downhole tools have been proposed. See e.g., Aaron Flores, “Active Cooling for Electronics in a Wireline Oil-Exploration Tool,” Ph.D. thesis, MIT, 1996. This technique was based on a once-through vapor compression cycle. However, this approach requires very careful sealing and lubrication due to high pressure in the condenser part.
- a cooling system in accordance with one embodiment of the invention includes an insulating chamber disposed in the downhole tool, wherein the insulating chamber is adapted to house an object to be cooled; a Stirling cooler disposed in the downhole tool, wherein the Stirling cooler has a cold end configured to remove heat from the insulating chamber and a hot end configured to dissipate heat; and an energy source to power the Stirling cooler.
- a downhole tool in accordance with one embodiment of the invention includes a tool body; and a cooling system comprising: an insulating chamber disposed in the downhole tool, wherein the insulating chamber is adapted to house an object to be cooled; a Stirling cooler disposed in the downhole tool, wherein the Stirling cooler has a cold end configured to remove heat from the insulating chamber and a hot end configured to dissipate heat; and an energy source to power the Stirling cooler.
- a method in accordance with one embodiment of the invention includes disposing a sensor or electronics in an insulating chamber in the downhole tool; and disposing a Stirling cooler in the downhole tool proximate the insulating chamber such that the Stirling cooler is configured to remove heat from the insulating chamber.
- a method in accordance with one embodiment of the invention includes providing a Stirling cooler in the downhole tool proximate the sensor or electronics; and energizing the Stirling cooler such that heat is removed from the sensor or electronics.
- FIG. 1 shows a conventional downhole tool disposed in a borehole.
- FIG. 2 shows a downhole tool including a Stirling cooler in accordance with one embodiment of the invention.
- FIG. 3 shows a schematic illustrating heat transfer using a Stirling cooler in accordance with one embodiment of the invention.
- FIG. 4 shows a free-piston Stirling cooler in accordance with one embodiment of the invention.
- FIG. 5 shows a diagram illustrating a Stirling cycle.
- FIG. 6 shows a schematic illustrating various states of the pistons in the Stirling cooler in a Stirling cycle.
- FIG. 7 shows a schematic of an active air-flow cooling system in accordance with an embodiment of the invention.
- FIG. 8 shows a schematic of a liquid-fluid cooling system in accordance with an embodiment of the invention.
- FIG. 9 illustrates a method for manufacturing a downhole tool in accordance with one embodiment of the invention.
- FIG. 10 illustrates a method for cooling sensors or electronics within downhole tools in accordance with the invention.
- Embodiments of the invention relate to cooling systems for use in downhole tools. These cooling systems are based on Stirling cycles that can function efficiently in a closed system, require no lubrication, and can function at relatively lower pressures as compared to a vapor compression system.
- a Stirling engine or cooler is based on the Stirling (also referred to as “Sterling”) cycle, which is a well known thermodynamic cycle.
- a Stirling engine uses heat (temperature difference) as the energy source to provide mechanical work.
- a Stirling cooler operates in reverse; it uses mechanical energy to produce a temperature difference e.g., as a cooler or refrigerator.
- kinematic and free-piston types Various configurations of Stirling engines/coolers have been devised. These can be categorized into kinematic and free-piston types. Kinematic Stirling engines use pistons attached to drive mechanisms to convert linear piston motions to rotary motions. Kinematic Stirling engines can be further classified as alpha type (two pistons), beta type (piston and displacer in one cylinder), and gamma type (piston and displacer in separate cylinders). Free-piston Stirling engines use harmonic motion mechanics, which may use planar springs or magnetic field oscillations to provide the harmonic motion.
- Stirling cycle engines are rarely used in practical applications and Stirling cycle coolers have been limited to the specialty field of cryogenics and military use.
- the development of Stirling engines/coolers involves such practical considerations as efficiency, vibration, lifetime, and cost.
- Using Stirling engines/coolers on downhole tools presents additional difficulties because of the limited space available in a downhole tool (typically 3-6 inches [7.5-15 cm] in diameter) and the harsh downhole environments (e.g., temperatures up to 260° C., pressures up to 30,000 psi or more, and shock up to 250 g or more).
- Stirling engines have been proposed for use as electricity generators for downhole tools (See U.S. Pat. No. 4,805,407 issued to Buchanan).
- Embodiments of the present invention may use any Stirling cooler designs. Some embodiments use free-piston Stirling coolers. One free-piston Stirling cooler embodiment of the invention makes use of a moving magnet linear motor.
- FIG. 2 shows a downhole tool (such as 12 in FIG. 1 ) in accordance with one embodiment of the invention.
- a downhole tool 20 includes an elongated housing 21 that protects various components 23 of the instrument. These components 23 may include electronics that need to be protected from high temperatures. The components are disposed in an insulating enclosure or chamber 24 and connected to a Stirling cooler 22 . Other components 25 of the downhole tool 20 may be included at the other end of the Stirling cooler 22 . The components 25 may include other electronics for controlling the Stirling cooler 22 or mechanisms to remove heat from the hot end of the Stirling cooler 22 .
- FIG. 3 shows a schematic of a system for heat removal using a Stirling cooler in accordance with one embodiment of the invention.
- a Stirling cooler 22 functions as a heat pump, removing heat from the cold reservoir cartridge 33 to the mud flow (hot reservoir) 31 .
- the heat removed from the object to be cooled (the cold cartridge 33 ) is effectively “pumped” to the other end (the hot end) of the Stirling cooler and dissipated into the mud flow 31 , for example.
- the Stirling cooler 22 may be in direct contact with the object to be cooled.
- the Stirling cooler 22 may be placed at a distance from the object to be cooled with a heat transport mechanism 35 disposed therebetween to transfer the heat.
- the heat transport mechanism 35 may be any suitable heat transport device (e.g., a heat pipe), including those implemented with circulating fluids.
- Embodiments of the invention may also be implemented with heat transport mechanisms on the cold side and the hot side (not shown).
- FIG. 4 shows a schematic of a free-piston Stirling cooler that may be used with embodiments of the invention.
- the Stirling cooler 40 is attached to an object 47 to be cooled.
- a heat transport device may be used to transport heat between the object 47 and the Stirling cooler 40 .
- the Stirling cooler 40 includes two pistons 42 , 44 disposed in cylinder 46 .
- the cylinder 46 is filled with a working gas, typically air, helium or hydrogen at a pressure of several times (e.g., 20 times) the atmospheric pressure.
- the piston 42 is coupled to a permanent magnet 45 that is in proximity to an electromagnet 48 fixed on the housing.
- the electromagnet 48 When the electromagnet 48 is energized, its magnetic field interacts with that of the permanent magnet 45 to cause linear motion (in the left and right directions looking at the figure) of piston 42 .
- the permanent magnet 45 and the electromagnet 48 form a moving magnet linear motor.
- the particular sizes and shapes of the magnets shown in FIG. 4 are for illustration only and are not intended to limit the scope of the invention.
- the locations of the electromagnet and the permanent magnet may be reversed, i.e., the electromagnet may be fixed to the piston and the permanent magnet fixed on the housing (not shown).
- the electromagnet 48 and the permanent magnet 45 may be made of any suitable materials.
- the windings and lamination of the electromagnet are preferably selected to sustain high temperatures (e.g., up to 260° C.).
- the permanent magnets of the linear motors are made of a samarium-cobalt (Sm—Co) alloy to provide good performance at high temperatures.
- the electricity required for the operation of the electromagnet may be supplied from the surface, from conventional batteries in the downhole tool, from generators downhole, or from any other means known in the art.
- the movement of piston 42 causes the gas volume of cylinder 46 to vary.
- Piston 44 can move in cylinder 46 like a displacer in the kinematic type Stirling engines.
- the movement of piston 44 is triggered by a pressure differential across both sides of piston 44 .
- the pressure differential results from the movement of piston 42 .
- the movement of piston 44 in cylinder 46 moves the working gas from the left of piston 44 to the right of piston 44 , and vice-versa.
- This movement of gas coupled with the compression and decompression processes results in the transfer of heat from object 47 to heat dissipating device 43 .
- the temperature of the object 47 decreases.
- the Stirling cooler 40 may include a spring mass 41 to help reduce vibrations of the cooler resulting from the movements of the pistons and the magnet motor.
- FIG. 4 shows a Stirling cooler having a magnet motor that uses electricity to power the Stirling cooler
- other energy sources or energizing mechanisms
- operation of the Stirling cooler e.g., the back and forth movements of piston 42 in FIG. 4
- operation of the Stirling cooler may be implemented by mechanical means, such as a fluid-powered system that uses the energy in the mud flow coupled to a valve system and/or a spring (not shown).
- the hydraulic pressure of the mud flow could be used to push the piston in one direction, while the spring is used to move the piston in the other direction.
- a conventional valve system is used to control the flow of mud to the Stirling piston in an intermittent fashion.
- the coordinated action of a hydraulic system, a spring, and a valve system results in a back and forth movement of the piston 42 .
- FIG. 5 depicts these four states and the transitions between these states in a pressure-volume diagram.
- FIG. 6 illustrates the four states and the direction of the movements of the pistons 42 and 44 in a Stirling cycle.
- piston 42 moves to the right, increasing the volume in the cylinder (shown as 46 in FIG. 4 ).
- the magnet motor drives the movement of piston 42 . Due to the increased volume in the cylinder, the gas expands and absorbs heat.
- FIG. 7 shows a schematic of a system for heat removal using a Stirling cooler in accordance with another embodiment of the invention.
- a Stirling cooler 22 is coupled to an insulating enclosure or chamber 24 .
- the chamber 24 is configured with an internal cavity 26 formed therein and adapted to provide an path over the component(s) 23 housed therein.
- the cavity 26 may be formed using any conventional materials known in the art.
- a fan 27 is disposed within the chamber 24 to circulate air around the component 23 to be cooled, thereby actively transferring heat dissipating from the component(s) to the cold side of the Stirling cooler 22 .
- the fan 27 may be powered by the electrical supply feeding the Stirling cooler or by an independent power network (e.g. separate battery) as known in the art.
- This particular embodiment is further equipped with a heat exchanger 28 disposed at one end of the chamber 24 to increase cooling efficiency across the cooler/chamber interface and cool the recirculating air.
- the heat exchanger 28 may be a conventional heat sink or another suitable device as known in the art.
- Other embodiments may be implemented with multiple fans 27 to increase the cooling air flow.
- FIG. 8 shows a schematic of another system for heat removal using a Stirling cooler in accordance with an embodiment of the invention.
- a Stirling cooler 22 is coupled to an insulating enclosure or chamber 24 .
- the chamber 24 is configured with an internal liquid-coolant system 29 disposed therein.
- the coolant system 29 is adapted with a flow loop that allows a liquid to flow in a closed loop from the housed component(s) 23 to a heat exchanger 28 attached to the cold side of the Stirling cooler 22 .
- the coolant system 29 may be constructed using conventional materials known in the art (e.g., via multiple tubes).
- the heat exchanger 28 may be a conventional heat sink or another suitable device as known in the art.
- the coolant liquid which may be water or any suitable alternative, is circulated in the flow loop via a pump 30 coupled to the flow lines and powered by the Stirling cooler 22 power network or using independent power means.
- the Stirling cooler system of FIG. 8 is shown with the liquid-coolant system 29 centrally disposed within the chamber 24 , such that the component(s) 23 to be cooled surround the coolant system.
- the liquid-coolant system 29 may be implemented with the liquid-coolant system 29 in various configurations and lengths depending on space constraints.
- embodiments of the invention may be implemented with the liquid-coolant system configured within, or forming, the walls of the insulating chamber (not shown). In such embodiments the liquid-coolant system would not be centrally disposed within the chamber 24 .
- Embodiments comprising the liquid-coolant system 29 render increased cooling efficiency as the liquid collects the heat dissipated in the component 23 chamber and transfers it to the cold side of the Stirling 22 via the heat exchanger 28 .
- the use of liquid coolant, and, if desired in some embodiments, insulated coolant lines, allows a larger spatial separation between the Stirling cooler and the component to be cooled.
- Stirling coolers are used to cool electronics, sources, sensors or other heat sensitive parts that need to function in the harsh downhole environment.
- the component(s) to be cooled is disposed in an insulating chamber (e.g., a Dewar flask) and the cold end of the Stirling cooler is coupled to (either directly or via a heat transport mechanism) one side of the chamber.
- a substantial amount of heat e.g. 150 W
- Model studies also indicate that the Stirling cooler embodiments of the invention are capable of removing heat at a rate of up to 400 W.
- FIG. 2 A schematic of a portion of a downhole tool including a Stirling cooler embodiment of the invention is illustrated in FIG. 2 . It will be appreciated by those skilled in the art that embodiments of the invention are not limited to any particular type of downhole tool. Thus, the invention may be implemented with any tool or instrument adapted for subsurface disposal, including wireline tools, LWD/MWD/LWT tools, coiled tubing tools, casing drilling tools, and with long-term/permanently disposed tubulars used in reservoir monitoring.
- FIG. 9 shows a process for producing a downhole tool in accordance with one embodiment of the invention.
- the process 70 includes disposing an insulating chamber in a downhole tool (step 72 ).
- the insulating chamber may be a Dewar flask or a chamber made of an insulating material suitable for downhole use.
- the insulating chamber may be formed by a cutout on the insulating tool body (not shown).
- electronics that need to function at relative low temperatures are placed into the insulating chamber (step 74 ).
- the electronics, sources, or sensors may be placed in the insulating chamber before the latter is placed in the downhole tool.
- a Stirling cooler is disposed in the downhole tool (step 76 ).
- the relative order of placement of the Stirling cooler and the insulating chamber is not important, i.e., the Stirling cooler may be placed in the tool before the insulating chamber.
- the Stirling cooler is placed proximate the insulating chamber.
- the Stirling cooler may be placed at a distance from the insulating chamber and a heat transport mechanism may interposed therebetween to conduct heat from the chamber to the Stirling cooler.
- FIG. 10 shows a process for cooling a sensor or electronics disposed in a downhole tool in accordance with the invention.
- the process 100 includes providing a Stirling cooler in the downhole tool proximate the sensor or electronics (step 105 ); and energizing the Stirling cooler such that heat is removed from the sensor or electronics (step 110 ).
- a cooling system in accordance with embodiments of the invention can keep downhole components at significantly lower temperatures, enabling these components to render better performance and longer service lives.
- Cooling systems in accord with embodiments of the invention have closed systems, with minimal moving parts, ensuring smooth and quiet operation as well as providing a major advantage in qualifying the instruments for shock and vibration.
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Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/710,103 US20050097911A1 (en) | 2003-11-06 | 2004-06-18 | [downhole tools with a stirling cooler system] |
CA002485788A CA2485788C (en) | 2003-11-06 | 2004-10-26 | Downhole tools with a stirling cooler system |
MXPA04010745A MXPA04010745A (es) | 2003-11-06 | 2004-10-29 | Herramientas en pozo con un sistema de enfriador stirling. |
GB0424033A GB2408273B (en) | 2003-11-06 | 2004-10-29 | Cooling downhole tools |
FR0452531A FR2862081B1 (fr) | 2003-11-06 | 2004-11-04 | Outils de fond de trou dotes d'un systeme de refroidissement a cycle de stirling |
DE102004053251A DE102004053251A1 (de) | 2003-11-06 | 2004-11-04 | Kühlvorrichtung für ein Bohrlochwerkzeug und Verfahren zum Kühlen einer in einem Bohrlochwerkzeug angeordneten Komponente |
RU2004132534/03A RU2004132534A (ru) | 2003-11-06 | 2004-11-05 | Система и способ охлаждения для скважинного инструмента |
CNA2004100471773A CN1641185A (zh) | 2003-11-06 | 2004-11-08 | 具有斯特林冷却器系统的井下工具 |
US11/458,117 US7913498B2 (en) | 2003-11-06 | 2006-07-18 | Electrical submersible pumping systems having stirling coolers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US51778203P | 2003-11-06 | 2003-11-06 | |
US10/710,103 US20050097911A1 (en) | 2003-11-06 | 2004-06-18 | [downhole tools with a stirling cooler system] |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/458,117 Continuation-In-Part US7913498B2 (en) | 2003-11-06 | 2006-07-18 | Electrical submersible pumping systems having stirling coolers |
Publications (1)
Publication Number | Publication Date |
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US20050097911A1 true US20050097911A1 (en) | 2005-05-12 |
Family
ID=33519547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/710,103 Abandoned US20050097911A1 (en) | 2003-11-06 | 2004-06-18 | [downhole tools with a stirling cooler system] |
Country Status (8)
Country | Link |
---|---|
US (1) | US20050097911A1 (ru) |
CN (1) | CN1641185A (ru) |
CA (1) | CA2485788C (ru) |
DE (1) | DE102004053251A1 (ru) |
FR (1) | FR2862081B1 (ru) |
GB (1) | GB2408273B (ru) |
MX (1) | MXPA04010745A (ru) |
RU (1) | RU2004132534A (ru) |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040264543A1 (en) * | 2003-06-24 | 2004-12-30 | Halliburton Energy Services, Inc. | Method and apparatus for managing the temperature of thermal components |
US20060102353A1 (en) * | 2004-11-12 | 2006-05-18 | Halliburton Energy Services, Inc. | Thermal component temperature management system and method |
US20060213660A1 (en) * | 2005-03-23 | 2006-09-28 | Baker Hughes Incorporated | Downhole cooling based on thermo-tunneling of electrons |
EP1788188A1 (en) | 2005-11-21 | 2007-05-23 | Sclumberger Technology B.V. | Wellbore formation evaluation system and method with cooling |
US20080223579A1 (en) * | 2007-03-14 | 2008-09-18 | Schlumberger Technology Corporation | Cooling Systems for Downhole Tools |
US7440283B1 (en) * | 2007-07-13 | 2008-10-21 | Baker Hughes Incorporated | Thermal isolation devices and methods for heat sensitive downhole components |
US20090120637A1 (en) * | 2007-11-14 | 2009-05-14 | Baker Hughes Incorporated | Tagging a Formation for Use in Wellbore Related Operations |
US20100032161A1 (en) * | 2008-08-05 | 2010-02-11 | Baker Hughes Incorporated | Heat dissipater for electronic components in downhole tools and methods for using the same |
US20100223924A1 (en) * | 2009-03-09 | 2010-09-09 | Edward James Cargill | Heat engine apparatus and method |
WO2011009022A2 (en) * | 2009-07-17 | 2011-01-20 | Baker Hughes Incorporated | Method and apparatus of heat dissipaters for electronic components in downhole tools |
US20110079391A1 (en) * | 2009-10-06 | 2011-04-07 | Sylvain Bedouet | Cooling apparatus and methods for use with downhole tools |
US20110146967A1 (en) * | 2009-12-23 | 2011-06-23 | Halliburton Energy Services, Inc. | Downhole well tool and cooler therefor |
WO2012026825A1 (en) * | 2010-08-24 | 2012-03-01 | Norwegian Well Solutions As | Well logging tool |
WO2012055392A3 (de) * | 2010-10-30 | 2013-04-04 | Technische Universität Bergakademie Freiberg | Meisseldirektantrieb für werkzeuge auf basis einer wärmekraftmaschine |
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Also Published As
Publication number | Publication date |
---|---|
CN1641185A (zh) | 2005-07-20 |
CA2485788A1 (en) | 2005-05-06 |
GB2408273A (en) | 2005-05-25 |
FR2862081A1 (fr) | 2005-05-13 |
FR2862081B1 (fr) | 2007-07-20 |
CA2485788C (en) | 2007-12-04 |
GB0424033D0 (en) | 2004-12-01 |
GB2408273B (en) | 2006-03-01 |
MXPA04010745A (es) | 2005-07-05 |
RU2004132534A (ru) | 2006-04-10 |
DE102004053251A1 (de) | 2005-06-09 |
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