Announcement

Mr. Kazuhiko Tezuka and Mr. Yuki Maehara were elected as SPWLA Global Distinguished Speakers for 2021-2022.

Mr. Kazuhiko Tezuka (JAPEX) and Mr. Yuki Maehara (Schlumberger) have been selected as SPWLA Global Distinguished Speakers for 2021-2022. For more information, please click here. The schedule of online lectures will be announced on the JFES HP as soon as it is available. GDS-2021-05 DUAL-BITS CORING TOOL – NEW ROCK STRESS MEASUREMENT TECHNOLOGY APPLICABLE TO HIGH TEMPERATURE AND DEEP DEPTH; Kazuhiko Tezuka, Japex GDS-2021-09 WELL LOG ANALYSIS FOR METHANE HYDRATE SATURATION EVALUATION:HIGH-RESOLUTION AND ROCK PHYSICS; Yuki Maehara, Schlumberger

Invitation to the SPWLA Special Edition Webinar (17 December 2021)

Mr. Kazuhiko Tezuka (JAPEX), SPWLA Global Distinguished Speaker for 2021-2022, will give an online lecture as follows. For more information and registration, please click here. Date & Time Friday, 17th December, 2021, 6:00 ~ 7:00, 11:00 ~ 12:00 (Japan Time) Venue Online Language Englisth Title DUAL-BITS CORING TOOL – NEW ROCK STRESS MEASUREMENT TECHNOLOGY APPLICABLE TO HIGH TEMPERATURE AND DEEP DEPTH Kazuhiko Tezuka (JAPEX) Abstract We have developed a tool to drill core samples which is recording in-situ stress information around a bottom of a borehole. When the core is cut from the bedrock, it is released from the in-situ stress and expands slightly in the radial direction. Using this principle, the in-situ stress can be determined from the elliptical shape of the core cross section (Funato & Ito, 2017). However, the difference between major and minor axes of the ellipse only provides the difference between the maximum and the minimum in-situ stress, but the magnitude of each stress component cannot be determined. This is because the core diameter d0 before expansion is unknown. To solve this problem, we proposed the coring procedure using the “Dual core-bit tool” so that the shape before expansion is retained in part of the core. […]

SPWLA Special Edition Webinarのご案内 (2021/12/17)

2021－2022年度のSPWLA Global Distinguished Speakerに選出されている手塚和彦氏によるオンライン講演が下記の要領で開催されます。 参加登録と詳細は、こちらでご確認下さい。 開催日時 2021年12月17日(金) 6:00 ~ 7:00, 11:00 ~ 12:00 （日本時間） 場所 オンライン開催 言語 英語 題名 DUAL-BITS CORING TOOL – NEW ROCK STRESS MEASUREMENT TECHNOLOGY APPLICABLE TO HIGH TEMPERATURE AND DEEP DEPTH 手塚和彦（JAPEX） 講演要旨 We have developed a tool to drill core samples which is recording in-situ stress information around a bottom of a borehole. When the core is cut from the bedrock, it is released from the in-situ stress and expands slightly in the radial direction. Using this principle, the in-situ stress can be determined from the elliptical shape of the core cross section (Funato & Ito, 2017). However, the difference between major and minor axes of the ellipse only provides the difference between the maximum and the minimum in-situ stress, but the magnitude of each stress component cannot be determined. This is because the core diameter d0 before expansion is unknown. To solve this problem, we proposed the coring procedure using the “Dual core-bit tool” so that the shape before expansion is retained in part of the core. That is, after digging a groove (outer groove) in the borehole bottom by the outer core-bit, cut a smaller diameter core by the inner core-bit in a […]

2021－2022年度のSPWLA Global Distinguished Speakerに手塚和彦氏（JAPEX)、前原祐樹氏（Schlumberger）が選出されました。

2021－2022年度のSPWLA Global Distinguished Speakerに手塚和彦氏（JAPEX)、前原祐樹氏（Schlumberger）が選出されました。 詳細は、こちらでご確認下さい。 オンライン講演の予定が発表され次第、当HPにてお知らせ致します。 GDS-2021-05 DUAL-BITS CORING TOOL – NEW ROCK STRESS MEASUREMENT TECHNOLOGY APPLICABLE TO HIGH TEMPERATURE AND DEEP DEPTH; Kazuhiko Tezuka, Japex GDS-2021-09 WELL LOG ANALYSIS FOR METHANE HYDRATE SATURATION EVALUATION:HIGH-RESOLUTION AND ROCK PHYSICS; Yuki Maehara, Schlumberger