| (84) |
Designated Contracting States: |
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AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
| (30) |
Priority: |
24.01.2014 US 201461931047 P 04.12.2014 US 201414560538
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| (43) |
Date of publication of application: |
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30.11.2016 Bulletin 2016/48 |
| (73) |
Proprietor: Baker Hughes Holdings LLC |
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Houston, TX 77073 (US) |
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| (72) |
Inventors: |
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- KOMMAREDDI, Nagesh S.
Tulsa, OK 74137 (US)
- FAIRCHILD, Keith D
Sand Springs, OK 74063 (US)
- WARD, Jack B.
Tulsa, OK 74101 (US)
- CHOU, Lu-chien
Tulsa, OK 74137 (US)
- REED, Daniel L.
Benicia, CA 94510 (US)
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| (74) |
Representative: Novagraaf Group |
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Chemin de l'Echo 3 1213 Onex / Geneva 1213 Onex / Geneva (CH) |
| (56) |
References cited: :
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DE-A1-102010 021 792 US-A- 4 340 076 US-A- 4 958 653 US-A- 5 346 617 US-A1- 2008 047 614 US-A1- 2012 004 343 US-A1- 2012 231 982
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- SHAH S N ET AL: "Drag reduction characteristics in straight and coiled tubing - An
experimental study", JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, ELSEVIER, AMSTERDAM,
NL, vol. 53, no. 3-4, 1 September 2006 (2006-09-01), pages 179-188, XP027974902, ISSN:
0920-4105 [retrieved on 2006-09-01]
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