Development of Drill Pipe System for Ultra-Deep Drilling
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Accession number;06A1016307
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| Title;Development of Drill Pipe System for Ultra-Deep Drilling |
| Author;
INOUE TOMOYA
(Japan Agency for Marine-Earth Sci. and Technol., JPN)
NISHIGAKI MAKOTO
(Mitsubishi Heavy Ind., Ltd., Nagasaki Res. & Dev. Center, JPN)
TERADA SHIN
(Mitsubishi Heavy Ind., Ltd., Nagasaki Res. & Dev. Center, JPN)
WADA KAZUYASU
(Japan Agency for Marine-Earth Sci. and Technol., JPN)
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Journal Title;Kaiyo Kogaku Shinpojiumu (CD-ROM)
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Journal Code:S0108B
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ISSN:
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VOL.19th;NO.;PAGE.ROMBUNNO.88(2006)
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| Figure&Table&Reference;FIG.13, TBL.7, REF.9 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The scientific deep-sea drilling vessel "Chikyu" was designed to have the capability to drill down to a maximum drill string length of 10,000m to recover worthy core samples from the formations located deep under the seabed. During drilling operation various forces are exerted on a drill pipe such as a tension due to the weight of the drill string and vessel heave, as well as a bending stress due to vessel movement and ocean current. There is also a hoop stress due to holding by conventional tools "slips" which translate axial load to transverse load. As drilling depth increases, the total weight of the drill string becomes greater which in turn translates to proportionally more tension on the upper part of the drill string. The hoop stress can also become greater and critical if the force is sufficient and can actually damage or in the extreme case crush the drill pipe, called slip-crushing. Therefore, technical considerations on strength problem on drill pipe and equipment development to eliminate slip-crushing problem are necessary for ultra-deep drilling. This paper describes the considerations on the strength problem on drill pipe. Also, this describes development of drill pipe system for ultra-deep drilling as well as the outline of Automated Dual Elevator System which has been developed to eliminate slip-crushing by using two elevators instead of slips. (author abst.) |
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