Rotary core drilling bit : 無料・フリー素材/写真
Rotary core drilling bit / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | (public display, Drake Well Museum, Titusville, Pennsylvania, USA)------------------------------------Early wells were drilled using a spring pole apparatus - men would use their feet to "kick down" the drill bit and chip away at the rock (see: www.petroleumhistory.org/OilHistory/images/Cable/Sp_pole.jpg). Three feet of hole per day could be achieved using this method. As the oil industry developed, wells were drilled using cable tool rigs and later, rotary drill rigs. Most petroleum wells are drilled using rotary drill rigs - seen here is a drilling bit for this type of rig. During drilling, the small knobs on the bit's ring abrade and remove rock fragments. This bit is used for making cores. Coring involves drilling out a cylindrical column of rock that can be retrieved and examined at the surface.(Ex: www.flickr.com/photos/jsjgeology/46199121921 )----------------------See info. at:en.wikipedia.org/wiki/Drilling_riganden.wikipedia.org/wiki/Well_drilling |
| 撮影日 | 2007-06-15 11:59:20 |
| 撮影者 | James St. John |
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