First Successful Wireline Stress Testing in a Gas Hydrate Reservoir in the Hyuganada Sea, Japan

Satoshi Ohtsuki (), Bei Gao (), Takanao Yoshii, Yuki Maehara, Daigoro Watanabe, Takayuki Kanno and Zhaoya Fan
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Satoshi Ohtsuki: Japan Organization for Metals and Energy Security (JOGMEC), 1-2-2 Hamada Mihama-ku, Chiba-shi, Chiba 261-0025, Japan
Bei Gao: Schlumberger K.K., 2-14-30 Hokuyo, Nagaoka-shi, Niigata 940-0871, Japan
Takanao Yoshii: Japan Methane Hydrate Operating Co., Ltd. (JMH), 1-7-12 Marunouchi, Chiyoda-ku, Tokyo 100-0005, Japan
Yuki Maehara: Schlumberger K.K., 2-14-30 Hokuyo, Nagaoka-shi, Niigata 940-0871, Japan
Daigoro Watanabe: Schlumberger K.K., 2-14-30 Hokuyo, Nagaoka-shi, Niigata 940-0871, Japan
Takayuki Kanno: Schlumberger K.K., 2-14-30 Hokuyo, Nagaoka-shi, Niigata 940-0871, Japan
Zhaoya Fan: Schlumberger K.K., 2-14-30 Hokuyo, Nagaoka-shi, Niigata 940-0871, Japan

Energies, 2024, vol. 17, issue 11, 1-13

Abstract: This study presents a stress testing operation conducted using a wireline formation tester in a newly discovered gas hydrate prospect located offshore in Japan. The campaign, which spanned from December 2021 to January 2022, involved drilling a well using logging-while-drilling technology. Subsequently, wireline formation testing and stress testing were successfully conducted at three different depths within a gas hydrate-concentrated zone. The testing was accomplished in a single riserless descent, with the primary goal of obtaining crucial data such as mobility, formation pressure, and fracture gradient for one of the prospects. This operation marked the first stress testing job performed with dual packers in an open water and deepwater environment specifically for gas hydrate reservoirs. The study also provides a comprehensive interpretation of the data gathered during the operation. Moreover, it evaluates various properties such as formation mobility, formation pressure, initial breakdown pressure, closure pressure, fracture propagation pressure, and instantaneous shut-in pressure.

Keywords: gas hydrates; stress testing; formation testing; riserless operation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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