CN101970789A - Centraliser segment and centraliser - Google Patents
Centraliser segment and centraliser Download PDFInfo
- Publication number
- CN101970789A CN101970789A CN2009801090731A CN200980109073A CN101970789A CN 101970789 A CN101970789 A CN 101970789A CN 2009801090731 A CN2009801090731 A CN 2009801090731A CN 200980109073 A CN200980109073 A CN 200980109073A CN 101970789 A CN101970789 A CN 101970789A
- Authority
- CN
- China
- Prior art keywords
- device parts
- parts placed
- ring portion
- connection element
- ring
- 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.)
- Pending
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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
Abstract
A centraliser segment (11) which can, by itself or in combination with one or more corresponding centraliser segments, be used to form a centraliser (13) which can in use be clampingly engaged around an element (10) which is receivable in a borehole, said centraliser segment comprising a first collar portion (15), a second collar portion (17) and at least one bow element (19) 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 (21) provided at one end of the collar portions and second connection element (23) 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 segments are connectable together to form a centraliser which in use is capable of being received around the element whereby the intermediate portions are radially outermost, said first and second connection element having an adjustment means which can cause the diameter of the centraliser to be varied.
Description
Technical field
The present invention relates to device parts placed in the middle and by the formed device placed in the middle of one or more this device parts placed in the middle.This device placed in the middle can use with article such as anchor pole and the soil nailing that is positioned at boring undetermined.
Background technology
An application of device placed in the middle is to make anchor pole placed in the middle.Disclose in AU200143778 that to propose and can be used for before the inventor be borehole casing and anchor pole device placed in the middle placed in the middle.The device element placed in the middle of above-mentioned patent specification comprises Connection Element, and this Connection Element need use special tool to cause the motion between the Connection Element during around sleeve pipe or boring banding when the closed so that device placed in the middle of the interconnected ends that makes device placed in the middle.In addition, that Connection Element is generally the plane and bending is being admitted around sleeve pipe or anchor pole, so the intrinsic elasticity of Connection Element trends towards especially resisting any tensioning of this device appearance placed in the middle when device placed in the middle is employed around the element with minor diameter.Although it is highly beneficial when using with pipe fitting or sleeve pipe to be the device element placed in the middle of above-mentioned form, this device element placed in the middle still has problems when being applied to have than the element of minor diameter such as anchor pole and soil nailing.
This manual in the whole text in, in the background technology and the discussion of being carried out in the prior art of the present invention just to being convenient to understand the present invention.Should be understood that this discussion is not a part of confirming or admitting Australia and the interior common practise of world wide before the priority date that any described content is the application.
Summary of the invention
In manual and claim in the whole text, unless requirement is arranged in the context in addition, otherwise should understand that word " comprises (comprise) " or modification means the integer that comprises statement or integer group as " comprising (comprises) " or " comprising (comprising) " but not gets rid of any other integer or integer group.
According to an aspect of the present invention, a kind of device parts placed in the middle are provided, it can be used to form the device placed in the middle that can in use engage around the element banding independently or with one or more corresponding device parts placed in the middle in combination, described element can be received within the boring, described device parts placed in the middle comprise first ring portion, second ring portion and at least one ribbon element, ribbon element extends between described first ring portion and described second ring portion so that described ring portion is kept the relation that is spaced apart from each other, wherein, described ring has in use the inner surface with described member abuts, wherein, described ribbon element is configured to limit from the mid portion of described device parts placed in the middle away from the inner surface horizontal expansion of described ring, the lobed lateral contour of the external surface of the mid portion of described at least ribbon element, end in described ring portion is provided with first Connection Element, the other end in described ring portion is provided with second Connection Element, wherein, in use, described first Connection Element can engage with described second Connection Element of same device parts placed in the middle or another device parts placed in the middle, make one or more described device parts placed in the middle can be joined together to form in use the device placed in the middle that can be admitted around described element, thereby described mid portion is in outermost radial outside, described first Connection Element and second Connection Element have adjusting device, and described adjusting device can make the vary in diameter of described device placed in the middle.
According to preferred feature of the present invention, wherein, described ring portion along its longitudinal axis bending to have the most approaching flexibility of flexibility with the described element of using described device placed in the middle.
According to preferred feature of the present invention, described first Connection Element comprises passage, described passage forms to extend internally from corresponding end along the ring portion of correspondence, described second Connection Element comprises the elongate element that in use can be received within the described passage, described elongate element is formed with one group of serration, described one group of serration is along the spaced apart setting of at least a portion of described forming element, described passage is associated with the pawl element, and described pawl element is positioned as flexibly to engage when partly being received within the described passage when elongated with serration the lengthwise movement of this elongated part is controlled.According to preferred feature of the present invention, claw component and engaging of serration are configured to allow the relative motion between pawl and the described passage, thereby cause the diameter of described device placed in the middle to reduce but stop the diameter of described device placed in the middle to increase.According to preferred feature of the present invention, the external surface of described ring is provided with a pair of spaced maintenance tab, described a pair of spaced maintenance tab is positioned as and described passage open relation at interval, described maintenance tab is configured and is arranged admitting the part from described passage process of described elongate element when described device placed in the middle is applied to described element, thus make described elongate element from the external surface maintenance of the part of described passage process and described ring closely against relation.According to preferred feature of the present invention, be provided with many to keeping tab.
According to preferred feature of the present invention, described ribbon element has flexible resilient.
According to preferred feature of the present invention, described ribbon element is included at least two ribbon-shaped members of extending between described first ring portion and second ring portion.
According to preferred feature of the present invention, described first ring portion and second ring portion are substantially parallel.
According to preferred feature of the present invention, described first ring portion and second ring portion are set to ribbon-shaped members.
According to preferred feature of the present invention, described device parts placed in the middle are made by corrosion-resistant material.
According to a second aspect of the invention, a kind of device placed in the middle that is used for element is provided, described device placed in the middle comprises aforesaid device parts placed in the middle, wherein, the end of one or more device parts placed in the middle links together by described first Connection Element and second Connection Element and around described element, to be provided for the device placed in the middle of described element.
According to preferred feature of the present invention, the inner surface between Connection Element of described ring is turned up the soil at interval along the length of described ring and is provided with lug boss.According to preferred feature of the present invention, described lug boss comprises the rib strip shaped structure along the total inner surface horizontal expansion of described ring.
According to a specific embodiment or by following description, can understand the present invention more fully to it.
Description of drawings
Reference will be made to the accompanying drawings, in the accompanying drawings:
Fig. 1 is the stereogram according to the device parts placed in the middle of first embodiment;
Fig. 2 is the lateral view according to the device parts placed in the middle of first embodiment;
Fig. 3 is the end-view according to two device parts placed in the middle of first embodiment that is combined together to form device placed in the middle;
Fig. 4 is the stereogram of device placed in the middle, wherein shows the inner surface of device parts placed in the middle; And
Fig. 5 is the schematic diagram according to the device placed in the middle of first embodiment, and wherein this device placed in the middle is in place around anchor pole, and anchor pole is in place in boring.
The specific embodiment
This embodiment comprises device parts 11 placed in the middle, device parts 11 placed in the middle in use trend towards using separately or the placed in the middle device parts corresponding with other combine uses to form the device placed in the middle 13 that can be applicable to anchor pole 10 as shown in Figure 4, thereby the end of single parts or complete interconnecting member is joined together to form annular device 13 placed in the middle, this annular device 13 placed in the middle in use around anchor pole 10 location so that anchor pole 10 in boring between two parties.Have intermediate diameters to large diameter anchor pole 10, need to use complete interconnecting member forming device 13 placed in the middle, and for the anchor pole 10 with minor diameter, using single parts is suitable to form 13 of devices placed in the middle.Device 13 placed in the middle is by anticorrosive and have sufficient rigidity and flexible suitable plastic material forms, to carry out it as the function of device between two parties.
Every end of each ring portion is provided with connecting element 21 and 23, here the connecting element on each ring portion is identical, interconnects to limit device 13 placed in the middle like that and the end of the device element placed in the middle of connecting element complimentary to one another and feasible device element placed in the middle or another correspondence on each ring can be as shown in Figure 3 with locking.In addition, in case connecting element is bonded with each other to form device 13 placed in the middle, the diameter of so resulting device 13 placed in the middle can change.
First connecting element 21 that is located at two ring portion one ends comprises the passage 25 of the portrait orientation on the external surface that is formed at ring.Channel interior is provided with the pawl (not shown).Second connecting element 23 forms the ligule extension of ring, and second connecting element 23 is dimensioned and is configured to be received in slidably in the passage 25 of first connecting element.Passage has the cross section similar to the ligule extension.The external surface of extension is formed with one group of serration 27.When the extension of second connector was received within the passage 25 of the first corresponding connector, the pawl in the respective channel engaged so that extension is remained in the passage with serration 27.The characteristic of this joint is configured to make extension to move in the passage of correspondence so that the diameter of device placed in the middle reduces, but can't moves so that the diameter of device placed in the middle increases.Each passage 25 is associated with paired maintenance tab 31, and the inner shafts of paired maintenance tab 31 and passage separately is to the end part interval location of turning up the soil.Each keeps tab to be formed with flange shape extension in its outer end, and the part of every pair of tab becomes relation respect to one another herein.The spacing of the spacing of every pair of tab and the flange shape extension of tab is configured to make that after passage is passed in the end of second connecting element tab admittance also keeps the part of the end of second connecting element.
The free end interconnection of single device parts placed in the middle or complete interconnection device parts placed in the middle is to form device 13 placed in the middle.Under the situation of minor diameter anchor pole 10, can use single device parts placed in the middle, under the situation than major diameter anchor pole 10, two or more device parts 11 placed in the middle can link together in end to end mode by first connector 21 and second connector 23.Realize the interconnection between the end in the following manner: the passage 25 of first connector that the end insertion of second connector is corresponding, up to the control that serration 27 engages with pawl and therefore extension is subjected to pawl being moved further of passage that is positioned on second connector.Can in the scope that length determined, adjust the diameter of device 13 placed in the middle by the part that has serration 27 of extension.
In addition, shown in Fig. 3 and 4, the inner surface of each ring portion is provided with along interannular lug boss in groups or raised line 29 arranged apart.Each lug boss or raised line comprise rib, and rib is positioned on the inner surface along being provided with between two parties and being positioned as longitudinally on the whole width of whole ring inner surface horizontal expansion ring inner surface.
In use, device 13 placed in the middle is fixing around anchor pole 10 before anchor pole 10 inserts boring.The amount that forms the buckling degree in the ribbon element 19 of device parts placed in the middle of device 13 placed in the middle can change to allow the gap between boring 10 and the anchor pole 10.This can realize in the following manner: at first that of device 13 placed in the middle is attached around anchor pole 10, and then should be fastening around anchor pole 10.If in ribbon element 19, need the flexibility that increases, so with another around anchor pole 10 location, and this another ring promoted on the direction of an above-mentioned ring, thus make this another around anchor pole 10 banding securely.Ring portion is pushed to the flexibility that will increase ribbon element 19 together.Replacedly, the pulling ring portion will be so that it will reduce the flexibility of ribbon element 19 away from each other.
Because ribbon element 19 has flexible resilient, therefore when shifting onto anchor pole 10 in the boring, if ribbon element 19 runs into any obstacle in the drill hole wall, elastic deformation will take place in ribbon element 19 so, and ribbon element 19 is in case through this obstacle, and then ribbon element 19 returns its normal shape and contacts to keep with drill hole wall.Ribbon element 19 and drill hole wall are kept contacted and guaranteed that anchor pole 10 keeps placed in the middle when anchor pole 10 inserts in the boring.
The advantage that this embodiment provides be according to the application of the device placed in the middle of this embodiment not needs use special tool, and at least some embodiments of AU200143778 need use special tool.
In addition, the horizontal outline of the projection of ribbon element provides another advantage, because this bending guarantee because of anchor pole 10 in the boring inward turning then make under the situation that device placed in the middle rotates in boring, the cross section of arc projection makes the transverse edge of ribbon element and the sidewall of boring keep the gap, thereby and with the engage sides of holing device placed in the middle can more easily not rotated with anchor pole.On-stream, arc bending provides another advantage, that is, when with arc the comparing of AU200143778, this bending has improved arc intensity.
In addition, the intrinsic bending of ring portion can be used device placed in the middle around anchor pole, has reduced device placed in the middle is anchored on the degree of the required power of anchor pole thus.When device placed in the middle used with the minor diameter anchor pole, this had significant advantage.In addition, under the situation of diameter greater than the ring portion bending of anchor pole, the device placed in the middle that obtains can be admitted by banding around anchor pole, and the effect that this joint is replenished is only played in connector fastening.
Another advantage according to the device placed in the middle of this embodiment is to have lug boss 29, and lug boss 29 is as improving being frictionally engaged to prevent that device placed in the middle from carrying out lengthwise movement and angular movement around element of device placed in the middle and anchor pole.
Another advantage according to the device placed in the middle of this embodiment is, connecting element at ring interconnects with after forming device placed in the middle, the free end that the passage from first connecting element of second connecting element passes and the external surface of ring portion keep fluid-tight engagement, and need not repair the free end of second connecting element before element is inserted boring.
The invention is not restricted to by specific embodiment restricted portion described herein.This embodiment is intended to only be used for the example purpose.The product that is equal on the function, element and method fall in the scope of the present invention described herein clearly.In addition, the invention is not restricted to use, also can use with the interior any element that other has similar size of band location and boring with anchor pole.
Claims (17)
1. device parts placed in the middle, it can be used to form the device placed in the middle that can in use engage around the element banding independently or with one or more corresponding device parts placed in the middle in combination, described element can be received within the boring, described device parts placed in the middle comprise flexible, the flexible arcuate member of first ring portion, second ring portion and at least one band shape, arcuate member is extended so that described ring portion is kept the relation that is spaced apart from each other between described first ring portion and described second ring portion
Wherein, described ring has in use the inner surface with described member abuts,
Wherein, described arcuate member is configured to limit from the mid portion of described device parts placed in the middle away from the inner surface horizontal expansion of described ring, the lobed lateral contour of the external surface of the mid portion of described at least arcuate member,
End in described ring portion is provided with first Connection Element, the other end in described ring portion is provided with second Connection Element, wherein, in use, described first Connection Element can engage with described second Connection Element of same device parts placed in the middle or another device parts placed in the middle, make one or more described device parts placed in the middle can be joined together to form in use the device placed in the middle that can be admitted around described element, under this state, described mid portion is in outermost radial outside, described first Connection Element and second Connection Element have adjusting device, and described adjusting device can make the vary in diameter of described device placed in the middle.
2. device parts placed in the middle as claimed in claim 1, wherein, described arc being constructed to has flexibility along its length.
3. device parts placed in the middle as claimed in claim 1 or 2, wherein, described ring portion along its longitudinal axis bending to have and to have used the most approaching flexibility of flexibility of the described element of described device placed in the middle.
4. as claim 1,2 or 3 described device parts placed in the middle, wherein, described first Connection Element comprises passage, described passage forms to extend internally from corresponding end along the ring portion of correspondence, described second Connection Element comprises the elongate element that in use can be received within the described passage, described elongate element is formed with one group of serration, described one group of serration is along the spaced apart setting of at least a portion of described forming element, described passage is associated with the pawl element, and described pawl element is positioned as flexibly to engage when partly being received within the described passage when elongated with serration the lengthwise movement of this elongated part is controlled.
5. device parts placed in the middle as claimed in claim 4, wherein, described claw component is configured to allow to have relative motion between pawl and the described passage with engaging of serration, thereby causes the diameter of described device placed in the middle to reduce but stop the diameter of described device placed in the middle to increase.
6. as claim 4 or 5 described device parts placed in the middle, wherein, the external surface of described ring is provided with a pair of spaced maintenance tab, described a pair of spaced maintenance tab is positioned as and described passage open relation at interval, described maintenance tab is configured and is arranged to admit when described device placed in the middle is applied to described element, the part from described passage process of described elongate element, thus make keeping closely against relation of described elongate element from the part of described passage process external surface with described ring.
7. device parts placed in the middle as claimed in claim 6 wherein, are provided with many to keeping tab.
8. each described device parts placed in the middle of claim as described above, wherein, described ribbon element has flexible resilient.
9. each described device parts placed in the middle of claim as described above, wherein, described ribbon element is included at least two ribbon-shaped members of extending between described first ring portion and second ring portion.
10. each described device parts placed in the middle of claim as described above, wherein, described first ring portion and second ring portion are substantially parallel.
11. each described device parts placed in the middle of claim as described above, wherein, described first ring portion and second ring portion are set to ribbon-shaped members.
12. each described device parts placed in the middle of claim as described above, wherein, described device parts placed in the middle are made by corrosion-resistant material.
13. each described device parts placed in the middle of claim as described above, wherein, the inner surface between Connection Element of described ring is turned up the soil at interval along the length of described ring and is provided with lug boss.
14. device parts placed in the middle as claimed in claim 13, wherein, described lug boss comprises the rib strip shaped structure along the total inner surface horizontal expansion of described ring.
15. one kind basically as this paper with reference to the described device parts placed in the middle of accompanying drawing.
16. device placed in the middle that is used for element, described device placed in the middle comprises the device parts placed in the middle that are as each described form of claim 1-15, wherein, the end of one or more device parts placed in the middle links together by described first Connection Element and second Connection Element and around described element, to be provided for the device placed in the middle of described element.
17. one kind basically as this paper with reference to the described device placed in the middle of accompanying drawing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2008901065A AU2008901065A0 (en) | 2008-03-05 | Centraliser Segment and Centraliser | |
| AU2008901065 | 2008-03-05 | ||
| PCT/AU2009/000268 WO2009109010A1 (en) | 2008-03-05 | 2009-03-05 | Centraliser segment and centraliser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101970789A true CN101970789A (en) | 2011-02-09 |
Family
ID=41055486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801090731A Pending CN101970789A (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 |
| US20230091111A1 (en) * | 2020-02-18 | 2023-03-23 | Kwik-Zip Pty Ltd | 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 (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20010037882A1 (en) * | 2000-05-08 | 2001-11-08 | Kwik-Zip Pty. Ltd. | Borehole casing centraliser |
| US6367556B1 (en) * | 2000-05-05 | 2002-04-09 | Curt A. Moore | Multiple configuration centralizer device and method for using same |
| 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 |
| US20030178193A1 (en) * | 2002-03-11 | 2003-09-25 | Albert Hennessey | Casing centralizer |
| CN2594446Y (en) * | 2001-10-18 | 2003-12-24 | 张怀志 | Plastic collar casing centralizer |
| CN2720087Y (en) * | 2004-08-21 | 2005-08-24 | 魏学成 | Diameter-changing centering guide |
Family Cites Families (5)
| 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 |
| US4077470A (en) * | 1977-01-27 | 1978-03-07 | Weatherford/Lamb, Inc. | Well centralizer and method of making |
| GB2138056B (en) * | 1983-04-07 | 1986-07-02 | Weatherford Lamb | Control line protector for oil well tubing string |
| AU759084B2 (en) * | 2000-05-08 | 2003-04-03 | Kwik-Zip Pty Ltd | Centraliser Segment |
-
2009
- 2009-03-05 EP EP09717714A patent/EP2260173A1/en not_active Withdrawn
- 2009-03-05 CN CN2009801090731A patent/CN101970789A/en active Pending
- 2009-03-05 WO PCT/AU2009/000268 patent/WO2009109010A1/en active Application Filing
- 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 (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US6367556B1 (en) * | 2000-05-05 | 2002-04-09 | Curt A. Moore | Multiple configuration centralizer device and method for using same |
| US20010037882A1 (en) * | 2000-05-08 | 2001-11-08 | Kwik-Zip Pty. Ltd. | Borehole casing centraliser |
| US6637511B2 (en) * | 2000-05-08 | 2003-10-28 | Kwik-Zip Pty. Ltd. | Borehole casing centralizer |
| CN2594446Y (en) * | 2001-10-18 | 2003-12-24 | 张怀志 | Plastic collar casing centralizer |
| US20030178193A1 (en) * | 2002-03-11 | 2003-09-25 | Albert Hennessey | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2260173A1 (en) | 2010-12-15 |
| WO2009109010A1 (en) | 2009-09-11 |
| AU2009221645A1 (en) | 2009-09-11 |
| US20110079385A1 (en) | 2011-04-07 |
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| PB01 | Publication | ||
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Application publication date: 20110209 |