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Tetsuji Ohno

National Institute of Advanced Industrial Science and Technology

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Publication

Featured researches published by Tetsuji Ohno.

Geothermics | 2002

Cost reduction of polycrystalline diamond compact bits through improved durability

Tetsuji Ohno; Hirokazu Karasawa; Hideo Kobayashi

This work reports the results of laboratory drilling tests conducted in order to measure improvements due to design and cutter modifications on PDC bits intended for use in geothermal well drilling. These tests, using 142.88 mm-dia. PDC full face bits, concentrated on improvements in bit life and cost performance. The tests were performed using granite drilling samples and a laboratory drilling machine at atmospheric conditions. The results from changes in bit and cutter shape are reported in the work.

Mineralium Deposita | 2014

Geochemical prospecting for rare earth elements using termite mound materials

Yu Horiuchi; Tetsuji Ohno; Mihoko Hoshino; Ki-Cheol Shin; Hiroyasu Murakami; Maiko Tsunematsu; Yasushi Watanabe

International Journal of Rock Mechanics and Mining Sciences | 2016

Experimental results on the effect of Bit wear on torque response

Hirokazu Karasawa; Tetsuji Ohno; Kuniyuki Miyazaki; Akhmadi Eko

Archive | 2002

Downhole percussion drills

Hirokazu Karasawa; Tetsuji Ohno; Akinori Ota; Tsutomu Kaneko; Naoto Yamada; Tetsuomi Miyamoto

Exploration Geophysics | 2004

Seismic while drilling: Basic experiments using a percussion drill as an energy source

Toshiyuki Yokota; Kyosuke Onishi; Hirokazu Karasawa; Tetsuji Ohno; Akinori Ota; Tsutomu Kaneko

International Journal of Rock Mechanics and Mining Sciences | 2016

Performance evaluation of polycrystalline diamond compact percussion bits through laboratory drilling tests

Kuniyuki Miyazaki; Tetsuji Ohno; Hirokazu Karasawa; Shinichi Takakura; Akhmadi Eko

The Mining and Materials Processing Institute of Japan | 1996

Methods for Estimation of Rock Strength and Tooth Wear Using Tooth Bit. Study on analytical technique for downhole information (2nd Report).

Hirokazu Karasawa; Tetsuji Ohno; Masayuki Kosugi

The Mining and Materials Processing Institute of Japan | 1996

Study on analytical technique for downhole information (3rd Report). Applicability of Methods for Estimation of Rock Strength and Tooth Wear to Insert Bits.

Hirokazu Karasawa; Tetsuji Ohno; Masayuki Kosugi

Archive | 1996

Improvement of PDC bit`s performance at high rotary speed

Hirokazu Karasawa; Tetsuji Ohno; Hideo Kobayashi

Archive | 2000

DURABILITY IMPROVEMENT AND MANUFACTURING COST REDUCTION OF POLYCRYSTALLINE DIAMOND COMPACT BITS FOR GEOTHERMAL WELL DRILLING

Tetsuji Ohno; Hirokazu Karasawa; Hideo Kobayashi

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Hirokazu Karasawa

National Institute of Advanced Industrial Science and Technology

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Hideo Kobayashi

National Institute of Advanced Industrial Science and Technology

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Akhmadi Eko

MITSUBISHI MATERIALS CORPORATION

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Akinori Ota

National Institute of Advanced Industrial Science and Technology

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Kuniyuki Miyazaki

National Institute of Advanced Industrial Science and Technology

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Kyosuke Onishi

Kyoto University

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Toshiyuki Yokota

National Institute of Advanced Industrial Science and Technology

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Tsutomu Kaneko

National Institute of Advanced Industrial Science and Technology

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Yasushi Watanabe

ENVIRON

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Hiroyasu Murakami

National Institute of Advanced Industrial Science and Technology

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