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Effect of confining pressure on mechanical behavior of methane hydratebearing sediments
PETROLEUM EXPLORATION AND DEVELOPMENT
Volume 38, Issue 5, October 2011
Online English edition of the Chinese language journal
Cite this article as: PETROL. EXPLOR. DEVELOP., 2011, 38(5): 637–640. RESEARCH PAPER
Effect of confining pressure on mechanical behavior of
methane hydrate-bearing sediments
Li Yanghui*, Song Yongchen, Yu Feng, Liu Weiguo, Wang Rui
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian
116024, China
Abstract: Synthesized gas hydrate in lab was mixed with kaoline to form core samples, so as to simulate the hydrate-bearing sedimen-
tary layers in the seabed. Under conditions of different confining pressure, triaxial compressive tests were conducted on hydrate-bearing
sediments with different volume content of kaoline. The results show that: (1) The failure strength of gas hydrate-bearing sediments in-
creases with the confining pressure at a low-pressure stage. The strength tends to decline gently with further increases of confining pres-
sure. (2) The modulus of elasticity E0 keeps unchanged under various confining pressures. But the secant modulus E50 presents a great
dependency on the confining pressure. Secant modulus increases to the peak and then decreases with the increase of confining pressure;
(3) The internal friction angles of gas hydrate-bearing sediments are not sensitive to the volume ratio of kaoline, but its cohesion depends
on the volume ratio of kaoline. The sediment strength increases with the increase of kaoline content.
Key words: natural gas hydrate; mechanical property; seabed sediment; triaxial testing; safe extraction
Introduction
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