DRILLING METHOD AND DEVICE OF STRATUM IN LIQUID

WIPO Patent Application WO/2006/117935

A1

A drilling method of a stratum capable of drilling a stratum such as an underground resource endowment layer in liquid by laser irradiation in liquid. A laser beam transmitted by a laser transmission means (20) is applied, as a laser beam having a wavelength exhibiting high absorptivity to liquid (90), from a laser induction bubble generating means (35) into the liquid (90) to generate a bubble flow (36) and a stratum existing in the liquid is drilled using a fracture action force induced by laser. On the other hand, a laser beam (41) exhibiting low absorptivity to the liquid (90) is applied from a laser irradiating means (39) and passed through the bubble flow (36) so that a thermal action force is applied to the stratum thus fracturing the rock and drilling the stratum. The fracture action force and thermal action force can be cooperated.

KOBAYASHI TOSHIO (JP)
TAKAYAMA KAZUYOSHI (JP)
UEDA KEN-ICHI (JP)
OTOMO KAZUHISA (JP)
UETAKE SHIGEHITO (JP)

PCT/JP2006/305234

November 09, 2006

March 16, 2006

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JAPAN DRILLING CO LTD (JP)
UNIV TOHOKU (JP)
NAT UNIVERSITY CORP THE UNIVER (JP)
KOBAYASHI TOSHIO (JP)
TAKAYAMA KAZUYOSHI (JP)
UEDA KEN-ICHI (JP)
OTOMO KAZUHISA (JP)
UETAKE SHIGEHITO (JP)

E21B7/14; B23K26/12; B28D1/00; E21C37/18

JPH05141169A

1993-06-08

Kosugi, Yoshio (3-3 Nishi-shimbachi 3-chome, Minato-k, Tokyo 03, JP)

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