WO2015080737A1 - Element pressure release system - Google Patents
Element pressure release system Download PDFInfo
- Publication number
- WO2015080737A1 WO2015080737A1 PCT/US2013/072326 US2013072326W WO2015080737A1 WO 2015080737 A1 WO2015080737 A1 WO 2015080737A1 US 2013072326 W US2013072326 W US 2013072326W WO 2015080737 A1 WO2015080737 A1 WO 2015080737A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lug
- wedge
- pressure release
- retainer
- release system
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 description 8
- 238000000429 assembly Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 230000003993 interaction Effects 0.000 description 4
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1293—Packers; Plugs with mechanical slips for hooking into the casing with means for anchoring against downward and upward movement
-
- 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
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
Definitions
- FIG. 1 illustrates a schematic view of a well in which an illustrative embodiment of an element pressure release system is deployed
- FIG. 2 illustrates a cross sectional view of an illustrative embodiment of a packer assembly of FIG. 1 ;
- FIG. 3 A illustrates a partial cutaway view of an illustrative embodiment of an element pressure release system in a coupled/latched position
- FIG. 3B illustrates a partial cutaway view of an illustrative embodiment of an element pressure release system in a decoupled/released position
- FIG. 3C illustrates an enlarged view of teeth from a wedge and locking lug of the element pressure release system of FIG. 3A.
- any use of any form of the terms “connect,” “engage,” “couple,” “attach,” or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the elements and may also include indirect interaction between the elements described.
- the terms “including” and “comprising” are used in an open- ended fashion, and thus should be interpreted to mean “including, but not limited to”. Unless otherwise indicated, as used throughout this document, "or” does not require mutual exclusivity.
- a hydraulic coupling, connection, or communication between two components describes components that are associated in such a way that fluid pressure may be transmitted between or among the components.
- Reference to a fluid coupling, connection, or communication between two components describes components that are associated in such a way that a fluid can flow between or among the components.
- Hydraulically coupled, connected, or communicating components may include certain arrangements where fluid does not flow between the components, but fluid pressure may nonetheless be transmitted such as via a diaphragm or piston.
- the present disclosure relates generally to an element pressure release system that allows retrieval of packer assemblies set in a wellbore.
- packer assemblies When installed with slips, packer assemblies are typically considered permanents installations, and removal of these assemblies from the well may require milling and other costly operations.
- the embodiments described herein allow release of a standard slip used to retain the packer in a set or permanent position. By moving a mandrel upon which the packer assembly is delivered downhole, the forces exerted against the slip are released, thereby allowing the packer assembly to be retrieved from the wellbore.
- an element pressure release system 100 is used in a well 102 having a wellbore 104 that extends from a surface 108 of the well to or through a subterranean geological formation 1 12.
- the well 102 is illustrated onshore in FIG. 1, but the well could alternatively be an offshore well accessed by a floating or fixed platform.
- the element pressure release system 100 is part of a packer assembly 1 14 that has been positioned in the well during or after production tubing 1 16 is run into the well 102.
- the packer assembly 114 may be deployed and set by conventional or other unconventional methods.
- a packer assembly 201 includes an element pressure release system 202 that provides a simplified mechanism for releasing compression (or element pressure) that is stored within a permanent packer, or a packer that employs a pair of opposing casing slips used to retain the packer in the set position.
- the system may provide a less complicated and more cost effective means of retrieving an otherwise permanently-set packer.
- the packer assembly 201 may include a mandrel 203 that is connected to or received on a production tubing string extending from the surface of the well. As is typical of most opposing slip packer assemblies, the mandrel 203 may support an upper casing slip 205 and a lower casing slip
- Each casing slip 205, 207 may be adjacent a wedge 209, 211 that is slidably received on the mandrel 203.
- the wedges 209, 211 are capable of sliding between the casing slips
- the wedges 209, 211 may each include a ramped portion 213, 215 with ramped surface
- each wedge 209, 21 1 engages a complimentary ramped surface 216, 218 associated with the casing slips 205, 207. Movement of each wedge 209, 21 1 toward its respective casing slip 205,
- the element pressure release system 202 may be provided to allow a user to release the compressive force stored within the packer assembly 201 so that the packer assembly 201 may be retrieved from the wellbore.
- the element pressure release system 202 may include a recess or a groove 303 disposed in the mandrel 203 and one or more lugs, or locking lugs 305.
- Each locking lug 305 may include one or more grooves or teeth 307 that engage complimentary one or more grooves or teeth 309 on the wedge 209 when the element pressure release system 202 (and packer assembly 201) is in a coupled or set position as illustrated in FIG. 3 A.
- the locking lug 305 is positioned on an outer surface of the mandrel 203 as illustrated in FIG. 3A, and the teeth 307 of the locking lug 305 and the wedge 209 are engaged such that forces may be transmitted between the wedge 209 and the locking lug 305.
- the locking lug 305 fits within a window 31 1 of a retainer 313 that is slidingly received on the mandrel 203.
- the retainer 313 abuts the expandable element 221 and is capable of transferring forces to the locking lug 305.
- the window 31 1 of the retainer 313 passes through the retainer, and the retainer 313 may extend around a perimeter of the window 311. In some embodiments, the retainer 313 may surround the perimeter of the window 31 1. The presence of the window and the ability to cradle or surround the locking lug 305 is advantageous. The window 311 assists in containing the locking lug 305.
- a face 315 of the window that engages a face 316 of the locking lug is used for bearing, and the geometry of the window and lug, or their respective faces 315, 316, could be adjusted to control load, tilt (negative or positive), or other parameters.
- the faces 315, 316 may be substantially perpendicular to adjacent surfaces of the retainer 313 or locking lug 305 as illustrated in FIGS. 3A and 3B, or alternatively, non- perpendicular faces 315, 316 (relative to adjacent surfaces) may be provided depending on the desired load profile between the retainer 313 and locking lug 305.
- the geometry or shape of the window 311 and the locking lug 305 contained within the window 31 1 may also vary.
- the window 31 1 illustrated in FIGS. 3A and 3B appears to be C-shaped with an open side, the window 311 is only partially displayed for purposes of adequately displaying the locking lug 305.
- the window 31 1 may be rectangular in shape to constrain a rectangular- shaped locking lug 305.
- the window 311 may instead by circular, triangular, ovular, or may include other shapes as long as the locking lug 305 within the window is adequately able to facilitate transfer of force between the retainer 313 and the wedge 209.
- FIGS. 3 A and 3B illustrate a cross-sectional view of the element pressure release system 202, and only a single window 311 (or portion of a window) and locking lug 305 is illustrated. While in some embodiments, only a single window 311 and locking lug 305 may be associated with each retainer 313, in other embodiments multiple windows 311 and locking lugs 305 may be employed.
- each retainer 313 may include a pair of windows 31 1 disposed on opposing sides of the retainer 313. In other embodiments, more than two windows 31 1 and locking lugs 305 may be employed and may be spaced circumferentially around the retainer 313 with equal or unequal spacing. For example, in some embodiments, eight windows 311 may be circumferentially spaced around the retainer 313.
- the depth and other size parameters of the groove 303 of the mandrel 203 are such that the groove 303 is able to receive the locking lug 305 when the mandrel 203 is moved axially to place the element pressure release system 202 in the decoupled or release position illustrated in FIG. 3B.
- the locking lug 305 is able to drop into the groove 303 a distance sufficient to allow the one or more grooves or teeth 307 of the locking lug 305 to disengage the one or more grooves or teeth 309 of the wedge 209.
- the locking lug 305 and wedge 209 disengage, the stored forces within the packer assembly 201 are released, which results in a contraction of the expandable element 221.
- the release also relieves the forces exerted by the wedge 209 on the casing slips 205, 207, which allows the casing slips 205, 207 to disengage themselves from the casing, or alternatively a liner, or an uncased wellbore wall. This disengagement of the casing slips 205, 207 permits subsequent retrieval of the packer assembly 201.
- an enlarged view of teeth (or grooves) 309, 307 from wedge 209 and locking lug 305 of the element pressure release system 202 of FIG. 3A is illustrated. While the shape of the teeth 309, 307 may vary in different embodiments, an angle a of the teeth may in one embodiment be approximately sixty degrees. In other embodiments, the angle a may be greater than or less than sixty (60) degrees, but it is desired that the angle a not become too small such that it becomes difficult for the wedge 209 and the locking lug 305 to disengage when the packer assembly 201 is moved to the release position.
- the angle a be large enough that locking lug 305 disengages from the wedge 209 when the mandrel 203 is moved to position the recess or groove 303 beneath the locking lug 305. In some embodiments, if the angle a is twenty-nine (29) degrees or less, the locking lug 305 is not easily disengaged from the wedge 209.
- each window 31 1 provides better containment and control over the locking (or "set") and release capabilities of the element pressure release system 202.
- the independent locking lugs 305 are able to move freely relative to one another and do not suffer the same geometrical constraints as other components, such as a C-ring. If used in place of a plurality of lugs, the C-ring may provide less reliability in locking and releasing since the C-ring is circular in either its expanded or collapsed positions and elliptical in the other position.
- Example 1 An element pressure release system comprising:
- a mandrel having at least one groove or recess
- a retainer having at least one window passing through the retainer, the retainer extending around a perimeter of the at least one window; a lug positioned in the at least one window of the retainer; and a wedge configured to engage a casing slip and the lug such that, when the element pressure release system is in a coupled position, the lug is capable of transferring a force from the retainer to the wedge and the casing slip;
- Example 2 The element pressure release system of example 1, wherein the wedge comprises one or more teeth or grooves to engage the lug.
- Example 3 The element pressure release system of example 2, wherein the lug comprises complimentary one or more teeth or grooves to engage the one or more teeth or grooves of the wedge.
- Example 4 The element pressure release system of any of examples 1-3, wherein the element pressure release system in the decoupled position allows
- Example 5 The element pressure release system of any of examples 1-4, wherein, when the element pressure release system is in the coupled position:
- the lug is constrained between the wedge and the mandrel; and the lug is surrounded on any remaining sides by the retainer.
- Example 6 The element pressure release system of any of examples 1-5, wherein, when the element pressure release system is in the decoupled position:
- the lug is received by the groove or recess of the mandrel and is spaced apart from the wedge;
- the lug is surrounded on any remaining sides by the retainer.
- Example 7 The element pressure release system of any of examples 1-6, wherein the at least one window comprises eight windows circumferentially spaced around the retainer.
- Example 8 The element pressure release system of example 7, wherein the lug in each of the windows is independently capable of moving into the groove or recess relative to the other lugs.
- Example 9 The element pressure release system of any of examples 1-8, wherein the retainer extending around a perimeter of the at least one window further comprises the retainer surrounding the perimeter.
- Example 10 The element pressure release system of any of examples 1-9, wherein the at least one window further comprises:
- each window being independent from other windows and each window being surrounded along the perimeter by the retainer; wherein the lug in each of the windows is independently capable of moving into the groove or recess relative to the other lugs;
- each of the lugs remain within the windows.
- Example 1 A method comprising:
- the element pressure release system comprising:
- a mandrel comprising at least one groove or recess; and one or more lugs in a window of a retainer, wherein the one or more lugs are located at least partially between the wedge and the mandrel;
- Example 12 The method of example 1 1, wherein:
- the wedge comprises one or more teeth or grooves to engage the one or more lugs
- the one or more lugs comprise one or more complimentary teeth or grooves to engage the one or more teeth or grooves of the wedge.
- Example 13 The method of example 1 1 or 12, further comprising removing the element pressure release assembly from the bore.
- Example 14 The method of any of examples 11-13, wherein the retainer, when the one or more lugs is positioned in the window of the retainer, surrounds a perimeter of the one or more lugs.
- Example 15 A packer assembly capable of being disposed in a bore in a subterranean formation, the packer assembly comprising: a slip; and
- a wedge capable of, in a set position of the packer assembly, exerting a force on the slip to cause the slip to engage a casing or other surface, the wedge being capable of, in a release position of the packer assembly, allowing the slip to disengage the casing or other surface; wherein the wedge is held in the set position by a lug positioned within a window of a retainer.
- Example 16 The packer assembly of example 15, wherein the packer assembly is retrievable from the bore subsequent to the packer assembly being positioned in the release position.
- Example 17 The packer assembly of example 15 or 16, wherein the lug is constrained by the window of the retainer in both the set position and the release position.
- Example 18 The packer assembly of any of examples 15-17, further comprising a mandrel comprising a groove or recess capable of receiving the lug in the release position, wherein the lug, when received by the groove or recess, releases the wedge.
- Example 19 The packer assembly of any of examples 15-18, wherein: the wedge comprises one or more teeth or grooves to engage the lug; and the lug comprises one or more complimentary teeth or grooves.
- Example 20 The method of any of examples 15-19, wherein the retainer, when the lug is positioned in the window of the retainer, surrounds a perimeter of the lug.
- Example 21 An element pressure release system as shown and described herein.
- Example 22 A method of setting or releasing a packer or element pressure release system as shown and described herein.
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Earth Drilling (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1601867.3A GB2536556B (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
MYPI2016700348A MY175384A (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
CA2925473A CA2925473C (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
AU2013406171A AU2013406171B2 (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
BR112016007815-2A BR112016007815B1 (en) | 2013-11-27 | 2013-11-27 | ELEMENT PRESSURE RELEASE SYSTEM, METHOD FOR SETTING AND RECOVERING A PACKER ASSEMBLY, AND PACKER ASSEMBLY |
PCT/US2013/072326 WO2015080737A1 (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
SG11201600695RA SG11201600695RA (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
US15/029,171 US20160258234A1 (en) | 2013-11-27 | 2013-11-27 | Element Pressure Release System |
NO20160183A NO20160183A1 (en) | 2013-11-27 | 2016-02-03 | Element Pressure Release System |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2013/072326 WO2015080737A1 (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015080737A1 true WO2015080737A1 (en) | 2015-06-04 |
Family
ID=53199513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2013/072326 WO2015080737A1 (en) | 2013-11-27 | 2013-11-27 | Element pressure release system |
Country Status (8)
Country | Link |
---|---|
US (1) | US20160258234A1 (en) |
AU (1) | AU2013406171B2 (en) |
BR (1) | BR112016007815B1 (en) |
CA (1) | CA2925473C (en) |
GB (1) | GB2536556B (en) |
NO (1) | NO20160183A1 (en) |
SG (1) | SG11201600695RA (en) |
WO (1) | WO2015080737A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5526884A (en) * | 1995-05-05 | 1996-06-18 | Baker Hughes Incorporated | Downhole tool release mechanism |
US5941306A (en) * | 1997-10-07 | 1999-08-24 | Quinn; Desmond | Ratchet release mechanism for a retrievable well apparatus and a retrievable well apparatus |
US20020170710A1 (en) * | 2001-05-15 | 2002-11-21 | Doane James C. | Packer releasing system |
US20110147013A1 (en) * | 2009-12-18 | 2011-06-23 | Marion Dewey Kilgore | Retrieval Method For Opposed Slip Type Packers |
US20120186830A1 (en) * | 2011-01-25 | 2012-07-26 | Halliburton Energy Services, Inc. | Packer assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4813486A (en) * | 1987-09-23 | 1989-03-21 | Arrow Oil Tools, Inc. | Retractable slip assembly |
US6131953A (en) * | 1998-06-02 | 2000-10-17 | Halliburton Energy Services, Inc. | Coiled tubing drilling hydraulic disconnect |
US6257339B1 (en) * | 1999-10-02 | 2001-07-10 | Weatherford/Lamb, Inc | Packer system |
-
2013
- 2013-11-27 WO PCT/US2013/072326 patent/WO2015080737A1/en active Application Filing
- 2013-11-27 SG SG11201600695RA patent/SG11201600695RA/en unknown
- 2013-11-27 GB GB1601867.3A patent/GB2536556B/en active Active
- 2013-11-27 BR BR112016007815-2A patent/BR112016007815B1/en active IP Right Grant
- 2013-11-27 AU AU2013406171A patent/AU2013406171B2/en active Active
- 2013-11-27 US US15/029,171 patent/US20160258234A1/en not_active Abandoned
- 2013-11-27 CA CA2925473A patent/CA2925473C/en active Active
-
2016
- 2016-02-03 NO NO20160183A patent/NO20160183A1/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5526884A (en) * | 1995-05-05 | 1996-06-18 | Baker Hughes Incorporated | Downhole tool release mechanism |
US5941306A (en) * | 1997-10-07 | 1999-08-24 | Quinn; Desmond | Ratchet release mechanism for a retrievable well apparatus and a retrievable well apparatus |
US20020170710A1 (en) * | 2001-05-15 | 2002-11-21 | Doane James C. | Packer releasing system |
US20110147013A1 (en) * | 2009-12-18 | 2011-06-23 | Marion Dewey Kilgore | Retrieval Method For Opposed Slip Type Packers |
US20120186830A1 (en) * | 2011-01-25 | 2012-07-26 | Halliburton Energy Services, Inc. | Packer assembly |
Also Published As
Publication number | Publication date |
---|---|
US20160258234A1 (en) | 2016-09-08 |
CA2925473A1 (en) | 2015-06-04 |
SG11201600695RA (en) | 2016-02-26 |
CA2925473C (en) | 2018-07-31 |
BR112016007815B1 (en) | 2021-06-01 |
NO20160183A1 (en) | 2016-02-03 |
GB2536556B (en) | 2020-06-03 |
AU2013406171B2 (en) | 2017-04-06 |
GB2536556A (en) | 2016-09-21 |
GB201601867D0 (en) | 2016-03-16 |
AU2013406171A1 (en) | 2016-02-25 |
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