Nlc Co., Ltd.

Japan Agency for Marine-earth Science and Technology

Independent Administrative Institution, Japan Agency for Marine-earth Science and Technology

Masaki Kawahara

Eigou Miyazaki

Keita Akiyama

Tomoya Inoue

Tomoaki Suzuki

Masanori Kyo

Yuichi Shimmoto

Kazuyasu Wada

Yusuke Yano

A concave section such as an extension section, a cutting section, and a notch section is provided to receive a lid of a float valve in an inside of outer tube assembly of a drill string. Thus, when the float valve is provided for the drill string, it is made possible to collect a core with a larger diameter by a thinner drill string, by expanding the inner diameter of the drill string.

Float valve sub

Disclosed herein are a crustal core sampler, by which a crustal core sample can be cored in a state coated with a flow-able coating material free of any contamination, and a method of coring a core sample using this crustal core sampler. The crustal core sampler comprises a drilling mechanism and a barrel, wherein the barrel is equipped with a flow-able coating material-ejecting mechanism, and a columnar crustal core portion is coated with a flow-able coating material. Alternatively, the crustal core sampler is constructed by a drill pipe and an inner barrel, wherein the inner barrel is equipped with an inner barrel body, a core elevator, a channel-forming member for forming a flow-able coating material-running channel and flow-able coating material-ejecting openings, and a columnar crustal core portion is coated with a flow-able coating material.

Crustal core sampler and method of coring crustal core sample using the same

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Hitachiohmiya, Japan

Masaki Kawahara