CN104812988A - 超硬材料的切割元件、其形成方法和包含其的钻头 - Google Patents
超硬材料的切割元件、其形成方法和包含其的钻头 Download PDFInfo
- Publication number
- CN104812988A CN104812988A CN201380061913.8A CN201380061913A CN104812988A CN 104812988 A CN104812988 A CN 104812988A CN 201380061913 A CN201380061913 A CN 201380061913A CN 104812988 A CN104812988 A CN 104812988A
- Authority
- CN
- China
- Prior art keywords
- polycrystalline diamond
- matrix
- diamond body
- thermally stable
- pcd
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 114
- 238000005520 cutting process Methods 0.000 title claims abstract description 79
- 239000000463 material Substances 0.000 title claims description 102
- 239000010432 diamond Substances 0.000 claims abstract description 128
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 127
- 230000008569 process Effects 0.000 claims abstract description 40
- 239000003054 catalyst Substances 0.000 claims abstract description 29
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 15
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052582 BN Inorganic materials 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims description 211
- 238000005245 sintering Methods 0.000 claims description 53
- 239000003863 metallic catalyst Substances 0.000 claims description 42
- 239000007767 bonding agent Substances 0.000 claims description 40
- 238000002386 leaching Methods 0.000 claims description 34
- 239000013078 crystal Substances 0.000 claims description 33
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 9
- 239000010941 cobalt Substances 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract description 7
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 4
- 239000011800 void material Substances 0.000 description 19
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 238000005065 mining Methods 0.000 description 8
- 229910010293 ceramic material Inorganic materials 0.000 description 7
- 239000011195 cermet Substances 0.000 description 7
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- 239000007769 metal material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 238000003698 laser cutting Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- -1 MgCO 3) Chemical compound 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 3
- 229910001573 adamantine Inorganic materials 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000002224 dissection Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/573—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element
- E21B10/5735—Interface between the substrate and the cutting element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
- B28D1/146—Tools therefor
-
- 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
-
- 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
- E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
-
- 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
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
-
- 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/5676—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a cutting face with different segments, e.g. mosaic-type inserts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Earth Drilling (AREA)
- Manufacturing & Machinery (AREA)
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201261717070P | 2012-10-22 | 2012-10-22 | |
| US61/717,070 | 2012-10-22 | ||
| US13/837,609 | 2013-03-15 | ||
| US13/837,609 US20140110180A1 (en) | 2012-10-22 | 2013-03-15 | Ultra-hard material cutting elements, methods of forming the same and bits incorporating the same |
| PCT/US2013/060661 WO2014065965A1 (fr) | 2012-10-22 | 2013-09-19 | Éléments de coupe de matériaux ultra-durs, leurs procédés de formation et trépans dotés de ceux-ci |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104812988A true CN104812988A (zh) | 2015-07-29 |
Family
ID=50484317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380061913.8A Pending CN104812988A (zh) | 2012-10-22 | 2013-09-19 | 超硬材料的切割元件、其形成方法和包含其的钻头 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20140110180A1 (fr) |
| EP (1) | EP2909418A4 (fr) |
| CN (1) | CN104812988A (fr) |
| CA (1) | CA2888354A1 (fr) |
| WO (1) | WO2014065965A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111032992A (zh) * | 2017-07-28 | 2020-04-17 | 通用电气(Ge)贝克休斯有限责任公司 | 包括可旋转切削元件的切削元件组件和井下工具及相关方法 |
| CN113286930A (zh) * | 2018-11-12 | 2021-08-20 | 斯伦贝谢技术有限公司 | 具有非平面界面设计的非平面切割元件和包含这种元件的刀具 |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201411676D0 (en) | 2014-07-01 | 2014-08-13 | Element Six Abrasives Sa | Superhard constructions & methods of making same |
| GB201418660D0 (en) * | 2014-10-21 | 2014-12-03 | Element Six Abrasives Sa | Superhard constructions & methods of making same |
| US10668539B2 (en) | 2014-11-10 | 2020-06-02 | Smith International, Inc. | Graphite heater with tailored resistance characteristics for HPHT presses and products made therein |
| US10107043B1 (en) * | 2015-02-11 | 2018-10-23 | Us Synthetic Corporation | Superabrasive elements, drill bits, and bearing apparatuses |
| US10450808B1 (en) | 2016-08-26 | 2019-10-22 | Us Synthetic Corporation | Multi-part superabrasive compacts, rotary drill bits including multi-part superabrasive compacts, and related methods |
| US20230072819A1 (en) * | 2020-01-31 | 2023-03-09 | Diamond Innovations, Inc. | Interlocking components for forming a wear resistant layer |
| US11866372B2 (en) | 2020-05-28 | 2024-01-09 | Saudi Arabian Oil Company | Bn) drilling tools made of wurtzite boron nitride (W-BN) |
| US12024470B2 (en) | 2021-02-08 | 2024-07-02 | Saudi Arabian Oil Company | Fabrication of downhole drilling tools |
| US20230211414A1 (en) * | 2022-01-03 | 2023-07-06 | Saudi Arabian Oil Company | Producing polycrystalline diamond compact (pdc) drill bits with catalyst-free and substrate-free pdc cutters |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100146865A1 (en) * | 2008-02-06 | 2010-06-17 | Sumitomo Electric Industries, Ltd | Polycrystalline diamond |
| US20110114393A1 (en) * | 2009-11-16 | 2011-05-19 | Gerard Dolan | Super-hard cutter inserts and tools |
| US8074748B1 (en) * | 2009-02-20 | 2011-12-13 | Us Synthetic Corporation | Thermally-stable polycrystalline diamond element and compact, and applications therefor such as drill bits |
| US20120211284A1 (en) * | 2011-02-22 | 2012-08-23 | Baker Hughes Incorporated | Methods of forming polycrystalline compacts, cutting elements and earth-boring tools |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2128416A (en) * | 1936-05-13 | 1938-08-30 | Globe Oil Tools Co | Reamer cutter mounting |
| US2233724A (en) * | 1939-09-22 | 1941-03-04 | Nat Tube Co | Cutting tool |
| JP2500177B2 (ja) * | 1992-07-01 | 1996-05-29 | 大同メタル工業株式会社 | 転動子を有するラジアル・スラスト複合軸受 |
| US5810103A (en) * | 1996-12-03 | 1998-09-22 | Sylvan Engineering Company | Method and apparatus for mounting PCD compacts |
| US20050133276A1 (en) * | 2003-12-17 | 2005-06-23 | Azar Michael G. | Bits and cutting structures |
| GB2454122B (en) * | 2005-02-08 | 2009-07-08 | Smith International | Thermally stable polycrystalline diamond cutting elements and bits incorporating the same |
| US7533739B2 (en) * | 2005-06-09 | 2009-05-19 | Us Synthetic Corporation | Cutting element apparatuses and drill bits so equipped |
| US7506698B2 (en) * | 2006-01-30 | 2009-03-24 | Smith International, Inc. | Cutting elements and bits incorporating the same |
| US7703559B2 (en) * | 2006-05-30 | 2010-04-27 | Smith International, Inc. | Rolling cutter |
| EP2113049A4 (fr) * | 2007-01-31 | 2015-12-02 | Halliburton Energy Services Inc | Trépans rotatifs munis d'éléments tranchants protégés et leurs procédés |
| WO2010117765A1 (fr) * | 2009-03-30 | 2010-10-14 | Schlumberger Canada Limited | Eléments de découpe en diamant polycristallin thermiquement stable à double frittage |
| WO2011038263A2 (fr) * | 2009-09-25 | 2011-03-31 | Baker Hughes Incorporated | Élément de coupe et procédé pour sa formation |
| US9016409B2 (en) * | 2010-05-19 | 2015-04-28 | Smith International, Inc. | Rolling cutter placement on PDC bits |
| WO2011146736A2 (fr) * | 2010-05-19 | 2011-11-24 | Smith International, Inc. | Configuration de mèche de coupe à roulement |
| WO2011153439A1 (fr) * | 2010-06-03 | 2011-12-08 | Smith International, Inc. | Molette assemblée directement sur les poches d'un trépan |
| US8936115B2 (en) * | 2010-08-24 | 2015-01-20 | Varel Europe S.A.S. | PCD cutter with fins and methods for fabricating the same |
-
2013
- 2013-03-15 US US13/837,609 patent/US20140110180A1/en not_active Abandoned
- 2013-09-19 CN CN201380061913.8A patent/CN104812988A/zh active Pending
- 2013-09-19 CA CA2888354A patent/CA2888354A1/fr not_active Abandoned
- 2013-09-19 EP EP13848276.5A patent/EP2909418A4/fr not_active Withdrawn
- 2013-09-19 WO PCT/US2013/060661 patent/WO2014065965A1/fr active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100146865A1 (en) * | 2008-02-06 | 2010-06-17 | Sumitomo Electric Industries, Ltd | Polycrystalline diamond |
| US8074748B1 (en) * | 2009-02-20 | 2011-12-13 | Us Synthetic Corporation | Thermally-stable polycrystalline diamond element and compact, and applications therefor such as drill bits |
| US20110114393A1 (en) * | 2009-11-16 | 2011-05-19 | Gerard Dolan | Super-hard cutter inserts and tools |
| US20120211284A1 (en) * | 2011-02-22 | 2012-08-23 | Baker Hughes Incorporated | Methods of forming polycrystalline compacts, cutting elements and earth-boring tools |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111032992A (zh) * | 2017-07-28 | 2020-04-17 | 通用电气(Ge)贝克休斯有限责任公司 | 包括可旋转切削元件的切削元件组件和井下工具及相关方法 |
| CN111032992B (zh) * | 2017-07-28 | 2021-07-30 | 通用电气(Ge)贝克休斯有限责任公司 | 包括可旋转切削元件的切削元件组件和井下工具及相关方法 |
| CN113286930A (zh) * | 2018-11-12 | 2021-08-20 | 斯伦贝谢技术有限公司 | 具有非平面界面设计的非平面切割元件和包含这种元件的刀具 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014065965A1 (fr) | 2014-05-01 |
| EP2909418A4 (fr) | 2016-07-20 |
| EP2909418A1 (fr) | 2015-08-26 |
| US20140110180A1 (en) | 2014-04-24 |
| CA2888354A1 (fr) | 2014-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150729 |
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| WD01 | Invention patent application deemed withdrawn after publication |