Japan drills, logs gas hydrate wells in the Nankai Trough

Hideaki Takahashi Japan Petroleum Exploration Co. Ltd. Tokyo Yoshihiro Tsuji Japan Oil, Gas and Metals National Corp. Chiba City The Japanese continue to evaluate natural methane hydrates in the Nankai trough, drilling 32 wells through bottom-simulating reflectors (BSRs) during a 2004 research program. The first part of this series (OGJ, Sept. 5, 2005, p. 48) introduced the general operations program for the Nankai trough, including logging while drilling, wireline logging, and coring activities. This concluding article details the experimental drilling program, the borehole temperature sensing program, and drilling and operational issues encountered in the Nankai Trough, Japan. Experimen...

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