WO2009074526A1 - System for drilling a wellbore - Google Patents
System for drilling a wellbore Download PDFInfo
- Publication number
- WO2009074526A1 WO2009074526A1 PCT/EP2008/066994 EP2008066994W WO2009074526A1 WO 2009074526 A1 WO2009074526 A1 WO 2009074526A1 EP 2008066994 W EP2008066994 W EP 2008066994W WO 2009074526 A1 WO2009074526 A1 WO 2009074526A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wellbore
- tubular section
- expanded
- section
- drill string
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 28
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 17
- 238000005520 cutting process Methods 0.000 description 9
- 238000005755 formation reaction Methods 0.000 description 8
- 239000004568 cement Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003019 stabilising effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
Definitions
- the present invention relates to a system for drilling a wellbore into an earth formation whereby an expandable tubular element extends into the wellbore.
- casing and “liner” refer to tubular elements for supporting and stabilising the wellbore wall, whereby it is generally understood that a casing extends from surface into the wellbore and that a liner extends from a certain depth further into the wellbore.
- casing and “liner” refer to tubular elements for supporting and stabilising the wellbore wall, whereby it is generally understood that a casing extends from surface into the wellbore and that a liner extends from a certain depth further into the wellbore.
- EP 1438483 Bl discloses a system for expanding a tubular element in a wellbore whereby the tubular element, in unexpanded state, is initially attached to a drill string during drilling of a new wellbore section.
- a conical expander is used with a largest outer diameter substantially equal to the required tubular diameter after expansion. The expander is pumped, pushed or pulled through the tubular element. Such method can lead to high friction forces between the expander and the tubular element. Also, there is a risk that the expander becomes stuck in the tubular element.
- EP 0044706 A2 discloses a flexible tube of woven material or cloth that is expanded in a wellbore by eversion to separate drilling fluid pumped into the wellbore from slurry cuttings flowing towards the surface .
- a system for drilling a wellbore into an earth formation comprising an expandable tubular element extending into the wellbore, whereby a lower end portion of the wall of the tubular element extends radially outward and in axially reverse direction so as to define an expanded tubular section extending around a remaining tubular section of the tubular element, the expanded tubular section being extendable by downward movement of the remaining tubular section relative to the expanded tubular section whereby said lower end portion of the wall bends radially outward and in axially reverse direction; and - a drill string extending through the remaining tubular section, wherein the tubular element and the drill string are arranged for transferring a thrust force from the remaining tubular section to the drill string, and wherein the drill string includes a jetting head for deepening the wellbore by jetting a stream of fluid against the bottom of the well
- the tubular element By moving the remaining tubular section downward relative to the expanded tubular section during drilling, the tubular element is effectively turned inside out whereby the lower end portion of the wall of the tubular element is continuously bent radially outward and in axially reverse direction so that the tubular element is progressively expanded without the need for an expander that is pushed, pulled or pumped through the tubular element.
- the expanded tubular section forms a casing or liner that is installed in the wellbore during the drilling process, so that a relatively short open-hole section can be maintained during drilling.
- the thrust force transmitted from the remaining tubular section to the drill string can be kept small since the jetting head requires only a small thrust force when compared to the large thrust force required for drilling with a conventional drill bit.
- the downward force that must be exerted to the remaining tubular section to move it downward includes only a small component for thrusting the drill string during drilling. It is thereby achieved that the risk of exceeding the yield strength of the remaining tubular section is significantly reduced, when compared to drilling with a conventional drill bit.
- the system of the invention comprises means for centralising the jetting head in the remaining tubular section.
- the drill string is provided with a reamer for reaming the wellbore to at least an outer diameter of the expanded tubular section.
- the remaining tubular section and the drill string are arranged for simultaneous lowering in the wellbore whereby, for example, said lower end portion of the wall is arranged for lowering into the wellbore at substantially the same speed as the speed of lowering of the drill string during drilling of the wellbore .
- the wall of the tubular element includes a material that is plastically deformed during the bending process, so that the expanded tubular section retains an expanded shape as a result of said plastic deformation.
- the wall of the tubular element is made of a metal such as steel or any other ductile metal capable of being plastically deformed by eversion of the tubular element.
- the expanded tubular section then has adequate collapse resistance, for example in the order of 100-150 bars .
- the remaining tubular section is induced to move downward while the expanded tubular section is kept stationary in the wellbore.
- the remaining tubular section is subjected to an axially compressive force, which at least partly can result from the weight of the remaining tubular section. If necessary the weight can be supplemented by an external, downward, force applied to the remaining tubular section to induce said movement. As the length, and hence the weight, of the remaining tubular section increases, an upward force may need to be applied to the remaining tubular section to prevent uncontrolled bending or buckling of the wall.
- the remaining tubular section is axially extended at its upper end in correspondence with its downward movement. This is done, for example, by adding tubular portions at the upper end in any suitable manner such as by welding.
- the remaining tubular section is formed as a coiled tubing that is unreeled from a reel and subsequently inserted into the wellbore. In this way the process of eversion of the tubular element can be continued until a desired length of the tubular element is expanded.
- Fig. 1 schematically shows a lower portion of a first embodiment of the system of the invention
- Fig. 2 schematically shows the first embodiment during cutting of a tubular element in a wellbore
- FIG. 3 schematically shows a lower portion of a second embodiment of the system of the invention.
- like reference numerals relate to like components.
- a system including a wellbore 1 extending into an earth formation 2, and an expandable tubular element m the form of liner 4 extending from surface downwardly into the wellbore 1.
- the liner 4 has been partially radially expanded by eversion of the wall of the liner whereby a radially expanded tubular section 10 of the liner 4 has been formed, which has an outer diameter substantially equal to the wellbore diameter.
- the wall of the liner 4 is, due to eversion at its lower end, bent radially outward and m axially reverse (i.e.
- the U- shaped lower section 11 of the liner 4 defines a bending zone 12 of the liner.
- the expanded liner section 10 is axially fixed to the wellbore wall 14 by any suitable anchoring means (not shown) , or by frictional forces between the expanded liner section 10 and the wellbore wall 14 resulting from the expansion process.
- the U-shaped lower section 11 of liner 4 is positioned a short distance above the bottom of the wellbore so that an open-hole wellbore section 13 is defined below the U-shaped lower section 11.
- a drill string 20 extends from surface through the unexpanded liner section 8 to the bottom of the wellbore 1, with a jetting head 22 at its lower end.
- the jetting head 22 comprises a plurality of jetting nozzles 24 and cutting nozzles 26.
- the jetting nozzles 24 are directed so as to eject fluid jets 28 against the bottom and/or the wall of the wellbore 1.
- Each fluid jet 28 suitably includes a stream of fluid, e.g. water, with abrasive particles entrained therein.
- the cutting nozzles 26 are directed radially outward from the jetting head.
- the drill string 20 is provided with a guide device 30 having a curved surface portion 32 arranged to transfer a thrust force from the liner 4 to the drill string 20, and to support and guide the U-shaped lower section 11 of the liner 4 during eversion of the liner 4.
- the guide device 30 is rotatable relative to the drill string 20 about its central longitudinal axis. Furthermore, the guide device 30 is collapsible so as to allow it to pass through the unexpanded liner section 4 (Fig. 2) .
- Fig. 3 is shown the second embodiment, which is substantially similar to the first embodiment, except that the cutting head 22 is provided with reamers 33 adapted to ream the wellbore 1 to a nominal diameter substantially equal to the outer diameter of the expanded liner section 10.
- the reamers 33 are radially retractable to allow the reamers 33 to pass through the unexpanded liner section 4 when in retracted mode.
- a lower end portion of the liner 4 is initially everted. That is, the lower end portion is bent radially outward and m axially reverse direction, whereby the U-shaped lower section 11 and a short length of expanded liner section 10 are initiated. Subsequently, the expanded liner section 10 is anchored to the wellbore wall 14 by the anchoring means. Depending on the geometry and/or material properties of the liner 4, the expanded liner section 10 alternatively can become anchored to the wellbore wall automatically by friction forces between the expanded liner section 10 and the wellbore wall 14. A downward force is then applied to the unexpanded liner section 8 so as to move it gradually downward.
- the unexpanded liner section 8 becomes progressively everted whereby the unexpanded liner section 8 is transformed into the expanded liner section 10.
- the bending zone 12 moves in downward direction during the eversion process at approximately half the speed of downward movement of the unexpanded liner section 8.
- the mechanical properties and dimensions of the liner 4 can be selected such that the expanded liner section 10 becomes pressed against the wellbore wall 14 as a result of the expansion process so as to seal against the wellbore wall and/or to stabilize the wellbore wall.
- the magnitude of the downward force can be gradually lowered in correspondence with the increasing weight of unexpanded liner section 8. Eventually, the downward force may need to be replaced by an upward force to prevent buckling of liner section 8.
- the unexpanded liner section 8 is at its upper end extended in correspondence with its downward movement, for example by adding tubular sections to the liner, or by continuously forming the liner from metal sheet on a reel.
- the drill string 20 is operated to deepen the wellbore bottom by ejecting the fluid jets 28 against the wellbore bottom whereby the drill string is rotated slowly.
- the drill string 20 thereby gradually moves downward into the wellbore 1.
- the force applied to the unexpanded liner section 4 is controlled such that the U-shaped section 11 of the liner 4 moves downward at the same speed as the drill string 20 and remains in contact with the curved surface portion 32 of guide device 30 whereby the U- shaped lower section 11 exerts a small thrust force to the drill string 20.
- an increasing portion of the thrust force results from the weight of the unexpanded liner section 8.
- the compressive load in unexpanded liner section 4 can be kept relatively low. It is thereby achieved that the risk of inadvertent buckling of the unexpanded liner section 4 is significantly reduced.
- the guide device 30 is collapsed and the drill string 20 is raised until the cutting nozzles 26 are positioned at the desired cutting level (Fig. 2) . Subsequently fluid jets 36 with entrained abrasive particles are jetted through cutting nozzles 26 against the unexpanded liner section 4 thereby cutting the liner section 4.
- Normal operation of the second embodiment is substantially similar to normal operation of the first embodiment.
- the reamers 33 are kept m expanded mode during drilling with the drill string 20 thereby enlarging the diameter of the wellbore 1 to the nominal diameter.
- the drill string is at its lower end provided with a conventional pilot drill bit for drilling a pilot bore of relatively small diameter, and the reamers are provided with jetting nozzles to enlarge the borehole to its nominal diameter. Since the jetting nozzles can be precisely controlled with respect to direction and velocity of the fluid jets, the jetting nozzles in the reamers allow accurate drilling of the borehole to its nominal diameter.
- the guide device 30 and the reamers 33 are radially retracted and the drill string 20 is retrieved through the unexpanded liner section 8.
- the length of unexpanded liner section that is still present in the wellbore can be left in the wellbore or it can be cut-off from the expanded liner section and retrieved to surface.
- a fluid for example brine
- a fluid for example brine
- one or more holes are provided in the U-shaped lower section to allow the pumped fluid to be circulated.
- a heavy fluid is pumped into the annulus so as to support the expanded liner section and increase its collapse resistance.
- expansion of the liner is started at surface or at a downhole location.
- an offshore wellbore whereby an offshore platform is positioned above the wellbore, at the water surface, it can be advantageous to start the expansion process at the offshore platform.
- the bending zone moves from the offshore platform to the seabed and from there further into the wellbore.
- the resulting expanded tubular element not only forms a liner in the wellbore, but also a riser extending from the offshore platform to the seabed. The need for a separate riser from is thereby obviated.
- conduits such as electric wires or optical fibres for communication with downhole equipment can be extended in the annulus between the expanded and unexpanded sections.
- Such conduits can be attached to the outer surface of the tubular element before expansion thereof.
- the expanded and unexpanded liner sections can be used as electricity conductors to transfer data and/or power downhole.
- the entire liner can be expanded with the method described above so that no unexpanded liner section remains in the wellbore.
- an elongate member for example a pipe string, can be used to exert the necessary downward force to the unexpanded liner section during the last phase of the eversion process.
- a friction reducing layer such as a Teflon layer
- a friction reducing coating can be applied to the outer surface of the liner before expansion.
- Such layer of friction reducing material furthermore reduces the annular clearance between the unexpanded and expanded sections, which results in a reduced tendency of the unexpanded section to buckle.
- centralizing pads and/or rollers can be applied between the unexpanded and expanded sections to reduce the friction forces and the annular clearance there-between.
- the expanded liner section can be expanded against the inner surface of another tubular element already present in the wellbore.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0821578-2A BRPI0821578A2 (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore in a ground formation |
GB1007862.4A GB2467866B (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore |
CA2704662A CA2704662A1 (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore |
AU2008334744A AU2008334744B2 (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore |
US12/746,880 US20100252333A1 (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore |
CN200880119958.5A CN101896683B (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07122725 | 2007-12-10 | ||
EP07122725.0 | 2007-12-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009074526A1 true WO2009074526A1 (en) | 2009-06-18 |
Family
ID=39327250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/066994 WO2009074526A1 (en) | 2007-12-10 | 2008-12-08 | System for drilling a wellbore |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100252333A1 (en) |
CN (1) | CN101896683B (en) |
AU (1) | AU2008334744B2 (en) |
BR (1) | BRPI0821578A2 (en) |
CA (1) | CA2704662A1 (en) |
GB (1) | GB2467866B (en) |
WO (1) | WO2009074526A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102667048A (en) * | 2009-12-23 | 2012-09-12 | 国际壳牌研究有限公司 | Drilling a borehole and hybrid drill string |
RU2777216C1 (en) * | 2021-12-07 | 2022-08-01 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Device for simultaneous drilling and fastening of the zones of shedding and collapses when drilling a well |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009074573A1 (en) * | 2007-12-11 | 2009-06-18 | Shell Internationale Research Maatschappij B.V. | System for drilling a wellbore |
CA2704890A1 (en) | 2007-12-13 | 2009-06-18 | Shell Internationale Research Maatschappij B.V. | Method of expanding a tubular element in a wellbore |
AU2008334603B2 (en) * | 2007-12-13 | 2012-06-07 | Shell Internationale Research Maatschappij B.V. | Wellbore system |
AU2008346353B2 (en) | 2008-01-04 | 2012-05-17 | Shell Internationale Research Maatschappij B.V. | Method of drilling a wellbore |
US9422795B2 (en) | 2011-07-07 | 2016-08-23 | Shell Oil Company | Method and system for radially expanding a tubular element in a wellbore |
WO2013167520A1 (en) * | 2012-05-08 | 2013-11-14 | Shell Internationale Research Maatschappij B.V. | Method and system for sealing an annulus enclosing a tubular element |
US9695676B2 (en) | 2012-10-29 | 2017-07-04 | Shell Oil Company | System and method for lining a borehole |
US9488005B2 (en) | 2012-11-09 | 2016-11-08 | Shell Oil Company | Method and system for transporting a hydrocarbon fluid |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US2927775A (en) * | 1957-12-10 | 1960-03-08 | Jersey Prod Res Co | Unconsolidated formation core barrel |
US3674100A (en) * | 1970-08-12 | 1972-07-04 | Norman D Becker | Method and apparatus for drilling and casing a large diameter borehole |
US5803666A (en) * | 1996-12-19 | 1998-09-08 | Keller; Carl E. | Horizontal drilling method and apparatus |
US20070107941A1 (en) * | 2005-10-27 | 2007-05-17 | Fillipov Andrei G | Extended reach drilling apparatus & method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
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US4431069A (en) * | 1980-07-17 | 1984-02-14 | Dickinson Iii Ben W O | Method and apparatus for forming and using a bore hole |
US4482016A (en) * | 1983-11-17 | 1984-11-13 | Shell Oil Company | Acidizing with chemically heated weak acid |
GB2302153B (en) * | 1995-06-12 | 1999-10-20 | Wrc Plc | Pipeline renovation |
US6196336B1 (en) * | 1995-10-09 | 2001-03-06 | Baker Hughes Incorporated | Method and apparatus for drilling boreholes in earth formations (drilling liner systems) |
US7334650B2 (en) * | 2000-04-13 | 2008-02-26 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
AU2002356764A1 (en) * | 2001-11-28 | 2003-06-10 | Shell Internationale Research Maatschappij B.V. | Expandable tubes with overlapping end portions |
US7213643B2 (en) * | 2003-04-23 | 2007-05-08 | Halliburton Energy Services, Inc. | Expanded liner system and method |
EP1618279B1 (en) * | 2003-04-25 | 2007-11-07 | Shell Internationale Researchmaatschappij B.V. | Method of creating a borehole in an earth formation |
US8541051B2 (en) * | 2003-08-14 | 2013-09-24 | Halliburton Energy Services, Inc. | On-the fly coating of acid-releasing degradable material onto a particulate |
GB0320979D0 (en) * | 2003-09-08 | 2003-10-08 | Bp Exploration Operating | Method |
CN1313702C (en) * | 2005-06-02 | 2007-05-02 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
AR061881A1 (en) * | 2006-07-13 | 2008-10-01 | Shell Int Research | RADIAL EXPANSION METHOD OF A TUBULAR ELEMENT |
-
2008
- 2008-12-08 AU AU2008334744A patent/AU2008334744B2/en not_active Ceased
- 2008-12-08 GB GB1007862.4A patent/GB2467866B/en not_active Expired - Fee Related
- 2008-12-08 US US12/746,880 patent/US20100252333A1/en not_active Abandoned
- 2008-12-08 BR BRPI0821578-2A patent/BRPI0821578A2/en not_active IP Right Cessation
- 2008-12-08 CN CN200880119958.5A patent/CN101896683B/en not_active Expired - Fee Related
- 2008-12-08 WO PCT/EP2008/066994 patent/WO2009074526A1/en active Application Filing
- 2008-12-08 CA CA2704662A patent/CA2704662A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2927775A (en) * | 1957-12-10 | 1960-03-08 | Jersey Prod Res Co | Unconsolidated formation core barrel |
US3674100A (en) * | 1970-08-12 | 1972-07-04 | Norman D Becker | Method and apparatus for drilling and casing a large diameter borehole |
US5803666A (en) * | 1996-12-19 | 1998-09-08 | Keller; Carl E. | Horizontal drilling method and apparatus |
US20070107941A1 (en) * | 2005-10-27 | 2007-05-17 | Fillipov Andrei G | Extended reach drilling apparatus & method |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102667048A (en) * | 2009-12-23 | 2012-09-12 | 国际壳牌研究有限公司 | Drilling a borehole and hybrid drill string |
RU2777216C1 (en) * | 2021-12-07 | 2022-08-01 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Device for simultaneous drilling and fastening of the zones of shedding and collapses when drilling a well |
RU2790628C1 (en) * | 2022-06-28 | 2023-02-28 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Device for simultaneous drilling and fixing of sloughing zones and collapses when drilling a well |
Also Published As
Publication number | Publication date |
---|---|
CA2704662A1 (en) | 2009-06-18 |
GB2467866B (en) | 2012-03-07 |
US20100252333A1 (en) | 2010-10-07 |
CN101896683A (en) | 2010-11-24 |
GB201007862D0 (en) | 2010-06-23 |
GB2467866A (en) | 2010-08-18 |
AU2008334744A1 (en) | 2009-06-18 |
AU2008334744B2 (en) | 2011-09-08 |
CN101896683B (en) | 2013-03-27 |
BRPI0821578A2 (en) | 2015-06-16 |
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