WO2009109010A1 - Centraliser segment and centraliser - Google Patents
Centraliser segment and centraliser Download PDFInfo
- Publication number
- WO2009109010A1 WO2009109010A1 PCT/AU2009/000268 AU2009000268W WO2009109010A1 WO 2009109010 A1 WO2009109010 A1 WO 2009109010A1 AU 2009000268 W AU2009000268 W AU 2009000268W WO 2009109010 A1 WO2009109010 A1 WO 2009109010A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- centraliser
- segment
- collar
- connection element
- bow
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
- E21B17/1021—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs
Definitions
- the present invention relates to a centraliser segment and a centraliser formed of one or more of such centraliser segments.
- the centraliser can be used with items to be located within a borehole such as rock bolts and soil nails,.
- the centraliser elements of the above patent specification incorporated a connection element which required the use of a specialised tool in causing the movement between the connection element when closing the interconnected ends of the centraliser to cause it to clamp around the casing or borehole.
- connection elements were generally planar and were bent to be received about the casing or rock bolt and as result their natural resilience tended to resist any tightening of the centraliser especially when being applied around elements of small diameter. While the centraliser elements of the form referred to above can be very advantageous when used with pipes or casings they present problems when applied to elements of smaller diameter such as rock bolts and soil nails
- a centraliser segment which can, by itself or in combination with one or more corresponding centraliser segments, be used to form a centraliser which can in use be clampingly engaged around an element which is receivable in a borehole, said centraliser segment comprising a first collar portion, a second collar portion and at least one bow element extending between said first collar portion and said second collar portion to maintain the collar portions in spaced relation to each other, wherein the collars have an inner face which in use is to bear against the element and wherein said bow element has a curvature along its length to define an intermediate portion which extends laterally from the centraliser segment away from the inner faces of the collars, at least the intermediate portion of the bow elements having a convex transverse profile, a first connection element provided at one end of the collar portions and second connection element provided at the other end of the collar portions, wherein in use said first connection element are engagable with said second connection element of the same or another centraliser segment such that one or more said centraliser segment
- the collar portions are curved along their longitudinal axis to have a curvature which at most approaches the curvature of the element to which the centraliser is to be applied.
- the first connection element comprises a passage formed along the respective collar portion to extend inwardly from the respective end and the second connection element comprises an elongate element which in use is able to be received in the passage, the elongate element formed with a set of serrations spaced along at least a portion of its length, the passage formed with a pawl element which is positioned to resiliently engage the serrations to control the longitudinal movement of the elongate portion when received in the passage.
- the engagement of the pawl member with the serrations is such as to permit the reduction in diameter of the centraliser but to resist an increase in the diameter of the centraliser.
- the outer face of the collar is provided with a pair of transversely spaced retention lugs located in spaced relationship from the passage, the retention lugs configured and arranged to receive the portion of the elongate element passing from the passage on application of the centraliser to the element to hold the portion in close abutting relationship with the outer face of the collar.
- a plurality of pairs of retention lugs are provided.
- the bow element is flexibly resilient.
- said bow element comprises at least two strap members extending between said first and second collar portions.
- said first and second collar portions are substantially parallel.
- said first and second collar portions are provided as strap-like members.
- centraliser segment is made of a corrosion resistant material.
- a centraliser for an element comprising a centraliser segment, as hereinbefore described, wherein the ends of one or more centraliser segments are connected together via said first and second connection element around the element to provide a centraliser for the element.
- the inner face of the collars between the connection element is provided with a protrusion at spaced intervals along the length of the collars.
- the protrusions comprise a rib-like formation extending transversely across the inner face of the collars.
- Figure 1 is an isometric view of a centraliser segment according to the first embodiment
- Figure 2 is a side elevation of a centraliser segment according to the first embodiment.
- Figure 3 is an end elevation of two centraliser segments according to the first embodiment joined together to form a centraliser
- Figure 4 is an isometric view of the centraliser showing the inner face of the centraliser segment
- Figure 5 is an illustrative view of a centraliser according to the first embodiment in position around a rock bolt which is in position within a bore hole.
- the embodiment comprises a centraliser segment 11 which is intended in use to be used by itself or in combination with other corresponding centraliser segments to form a centraliser 13 which can be applied to a rock bolt 10 as shown at Figure 4 whereby the ends of a single segment or a set of interconnected segments are connected together to form an annular centraliser 13 which in use is to located around the rock bolt 10 to centralise the rock bolt 10 within a borehole.
- the use of a set of interconnected segments to form a centraliser 13 is required with rock bolts 10 having medium to large diameters, whilst the use of a single segment to form the centraliser 13 of is appropriate with rock bolts 10 having small diameters.
- the centralisers 13 are formed of a suitable plastics material which is resistant to corrosion and has sufficient rigidity and resilience to perform its function as a centraliser.
- the centraliser segment 11 comprises a first collar portion 15 and a second collar portion 17 which are held in spaced parallel relationship by a set of substantially parallel bow elements 19, which extend between the first and second collar portions 15 and 17.
- the first and second collar portions 15 and 17 are curved along their length.
- the bow elements 19 are strap-like members which are curved along their length such that the central intermediate portion of the bow elements 19 extends laterally to one side of the centraliser segment.
- the collar portions 15 and 17 snugly engage the rock bolt 10 while the bow elements 19 extend outwardly from the side of the rock bolt 10 to locate the rock bolt 10 centrally within the bore hole.
- the bow elements have a varied width along their length which is greatest at the central intermediate portion.
- each bow element has a convex transverse external profile.
- each end of each collar portion is provided with connector element 21 and 23 where the connector elements on each collar are the same and the connector elements on each collar are complementary to each other and enable the ends of a centraliser element or of another corresponding centraliser element to be lockingly interconnected as shown at Figure 3 to define a centraliser 13.
- the diameter of the resultant centraliser 13 is able to be varied.
- the first connector elements 21 which are provided at one end of both collar portions comprises a longitudinally directed passage 25 which is formed on the outer face of the collar.
- the interior of the passage is provided with a pawl (not shown).
- the second connector elements 23 are formed as tongue-like extensions of the collar and are dimensioned and configured to be slidably receivable in the passage 25 of the first connector elements.
- the passage is of similar cross section to the tongue-like extensions.
- the outer face of the extensions are formed with a set of serrations 27.
- Each passage 25 is associated with pairs of retention lugs 31 which are located at spaced internals form the inner axial end of the respective passage.
- Each of the retention lugs are formed at their outer ends with a flange like extension where the portions of each pair of lugs are in opposed relation to each other. The spacing between each pair of lugs and the spacing of their flange-like extensions is such that the lugs will receive and retain the portion of the ends of the second connector elements after they have passed through the passage.
- the free ends of the single centraliser segment or of a set of interconnected centraliser segments are interconnected to form a centraliser 13.
- a single centraliser segment can be used and in the case of larger diameter rock bolt 10 two or more centraliser segments 11 are able to be connected together end to end via the first and second connectors 21 and 23.
- the interconnection between the ends is effected by inserting the
- the diameter of the centraliser 13 is able to be adjusted through a range which is determined by the length of the serrated portion 27 of the extensions.
- each collar is provided with a set of protrusions or fillets 29 at spaced intervals along the collar.
- Each of the protrusions or fillets comprises a rib which is located centrally across the width of the inner face of the collar extends transversely across the inner face of the collar and is positioned to lie longitudinally on the inner face
- the centraliser 13 is fixed around the rock bolt 10 prior to the rock bolt 10 being inserted into a borehole.
- the amount of longitudinal curvature in the bow elements 19 of the centraliser segments forming a centraliser 13 can be varied to accommodate for the clearance between the borehole 10 and the rock bolt 10. This can be done by first affixing one collar of the centraliser 13 around the rock bolt 10 and tightening it around the rock bolt 10. If an increased curvature is required in the bow elements 19 then the other collar is located around the rock bolt 10 and is pushed in the direction of the one collar and then it is firmly clamped around the rock bolt 10. Pushing the collar portions together will increase the curvature of the bow elements 19. Alternatively pulling the collar portions away from each other will lessen the curvature of the bow elements 19.
- the bow elements 19 Due to the bow elements 19 being flexibly resilient, as the rock bolt 10 is pushed into the borehole, the bow elements 19 will resiliently deform if they encounter any obstruction in the wall of the borehole and once the bow elements 19 pass over the obstruction, they will return to their normal shape to maintain contact with the wall borehole. Maintaining the bow elements 19 in contact with the wall of the borehole ensures that the rock bolt 10 remains centralised as it is inserted into the borehole.
- One advantage offered by the embodiment is that the application of the centraliser according to the embodiment does not require the use of a specialised tool which is the case of at least some of the embodiments of AU200143778.
- the convex transverse external profile of the bow elements provides a further advantage since such curvature ensures that in the event the centraliser is caused to rotate within the borehole as a result of rotation of the rock bolt 10 within the borehole the convex cross section of the bows enables the lateral edges of the bow elements to remain clear of the side walls of the borehole and will not become engaged with the sides of the borehole thus enabling the centraliser to more readily rotate with the rock bolt.
- the curvature of the bows provides a further advantage in that it improves the strength of the bows when compared with the bows of AU200143778.
- a further advantage of the centraliser segment according to the embodiment is the presence of the protrusions 29 which serve to improve the frictional engagement of the centraliser with the rock bolt to prevent longitudinal movement and angular movement of the centraliser around the element.
- a further advantage of the centraliser segment according to the embpodiment is that on interconnection of connector elements of the collars to form a centraliser the free ends of the second connector elements which pass from the passages of the first connector elements are retained in snug engagement with the outer face of the collar by the retention lugs 31 and it becomes unnecessary to trim the
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09717714A EP2260173A1 (en) | 2008-03-05 | 2009-03-05 | Centraliser segment and centraliser |
AU2009221645A AU2009221645A1 (en) | 2008-03-05 | 2009-03-05 | Centraliser segment and centraliser |
CN2009801090731A CN101970789A (en) | 2008-03-05 | 2009-03-05 | Centraliser segment and centraliser |
US12/875,547 US20110079385A1 (en) | 2008-03-05 | 2010-09-03 | Centraliser segment and centraliser |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2008901065 | 2008-03-05 | ||
AU2008901065A AU2008901065A0 (en) | 2008-03-05 | Centraliser Segment and Centraliser |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/875,547 Continuation-In-Part US20110079385A1 (en) | 2008-03-05 | 2010-09-03 | Centraliser segment and centraliser |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009109010A1 true WO2009109010A1 (en) | 2009-09-11 |
Family
ID=41055486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2009/000268 WO2009109010A1 (en) | 2008-03-05 | 2009-03-05 | Centraliser segment and centraliser |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110079385A1 (en) |
EP (1) | EP2260173A1 (en) |
CN (1) | CN101970789A (en) |
AU (1) | AU2009221645A1 (en) |
WO (1) | WO2009109010A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2563239B (en) * | 2017-06-07 | 2020-03-25 | Vulcan Completion Products Uk Ltd | Downhole apparatus and associated methods |
WO2019060956A1 (en) * | 2017-09-28 | 2019-04-04 | Drillit International Pty Limited | A spacer device |
WO2021163759A1 (en) * | 2020-02-18 | 2021-08-26 | Kwik-Zip Pty Ltd | A spacer segment and a spacer |
CN112196515A (en) * | 2020-11-11 | 2021-01-08 | 西南石油大学 | Method for evaluating abrasion of gas well casing with complex borehole trajectory |
CA3215546A1 (en) * | 2021-04-30 | 2022-11-03 | Billy Christen Cloud | Centralizer |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4077470A (en) * | 1977-01-27 | 1978-03-07 | Weatherford/Lamb, Inc. | Well centralizer and method of making |
GB2138056A (en) * | 1983-04-07 | 1984-10-17 | Weatherford Lamb | Control line protector for oil well tubing string |
US4520869A (en) * | 1983-09-29 | 1985-06-04 | Svenson Bert N | Centralizer for well casings |
US4641776A (en) * | 1983-10-31 | 1987-02-10 | Baker Oil Tools, Inc. | Segmented concentric centralizer |
AU759084B2 (en) * | 2000-05-08 | 2003-04-03 | Kwik-Zip Pty Ltd | Centraliser Segment |
US6871706B2 (en) * | 2002-03-11 | 2005-03-29 | Albert Hennessey | Casing centralizer |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2516034A (en) * | 1947-03-06 | 1950-07-18 | Earl E Van Every | Outside tubing packer |
US2828824A (en) * | 1955-01-20 | 1958-04-01 | Baker Oil Tools Inc | Stop devices for well conduits |
US6367556B1 (en) * | 2000-05-05 | 2002-04-09 | Curt A. Moore | Multiple configuration centralizer device and method for using same |
AUPQ737500A0 (en) * | 2000-05-08 | 2000-06-01 | Kwik-Zip Pty Ltd | Borehole casing centraliser |
CN2594446Y (en) * | 2001-10-18 | 2003-12-24 | 张怀志 | Plastic collar casing centralizer |
CN2570443Y (en) * | 2002-09-09 | 2003-09-03 | 中国石化集团中原石油勘探局钻井工程技术研究院 | Stable arch type oil and gas well casing centralizer |
CN2720087Y (en) * | 2004-08-21 | 2005-08-24 | 魏学成 | Diameter-changing centering guide |
-
2009
- 2009-03-05 EP EP09717714A patent/EP2260173A1/en not_active Withdrawn
- 2009-03-05 WO PCT/AU2009/000268 patent/WO2009109010A1/en active Application Filing
- 2009-03-05 CN CN2009801090731A patent/CN101970789A/en active Pending
- 2009-03-05 AU AU2009221645A patent/AU2009221645A1/en not_active Abandoned
-
2010
- 2010-09-03 US US12/875,547 patent/US20110079385A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4077470A (en) * | 1977-01-27 | 1978-03-07 | Weatherford/Lamb, Inc. | Well centralizer and method of making |
GB2138056A (en) * | 1983-04-07 | 1984-10-17 | Weatherford Lamb | Control line protector for oil well tubing string |
US4520869A (en) * | 1983-09-29 | 1985-06-04 | Svenson Bert N | Centralizer for well casings |
US4641776A (en) * | 1983-10-31 | 1987-02-10 | Baker Oil Tools, Inc. | Segmented concentric centralizer |
AU759084B2 (en) * | 2000-05-08 | 2003-04-03 | Kwik-Zip Pty Ltd | Centraliser Segment |
US6871706B2 (en) * | 2002-03-11 | 2005-03-29 | Albert Hennessey | Casing centralizer |
Also Published As
Publication number | Publication date |
---|---|
EP2260173A1 (en) | 2010-12-15 |
US20110079385A1 (en) | 2011-04-07 |
AU2009221645A1 (en) | 2009-09-11 |
CN101970789A (en) | 2011-02-09 |
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