Mechanical response of sediments induced by horizontal well depressurization of natural gas hydrate in South China Sea

被引：0

作者：

Guo X. ^{[1
]}

Jin Y. ^{[1
]}

Lin B. ^{[1
]}

Lu Y. ^{[1
]}

Zi J. ^{[1
]}

机构：

[1] College of Petroleum Engineering in China University of Petroleum (Beijing), Beijing

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2022年 / 46卷 / 06期

关键词：

elastoplastic deformation; horizontal well; natural gas hydrates; numerical simulation; rock and soil mechanics;

D O I：

10.3969/j.issn.1673-5005.2022.06.005

中图分类号：

学科分类号：

摘要：

Based on the physical and mechanical properties of the shaly silt sediments in South China Sea, a thermal-hydraulic-mechanical-chemical response model simulating the horizontal well depressurization was established. The elastic-plastic model was used to characterize the plastic deformation. The results show that the pressure drop of deep horizontal well is lower than that of shallow horizontal well due to gravity effect, which restrains the expansion of hydrate dissociation front to some extent and leads to the productivity of deep horizontal well lower than that of shallow horizontal well. When the front edge of hydrate dissociation is not formed at the beginning of depressurization mining, the plastic strain of sediment layer is not strong. With the increase of depressurization mining time, the mechanical properties of the hydrate decomposition zone deteriorate significantly, and the strength parameters such as cohesion in the decomposition zone become lower. Plastic strain in dissociated zones is obviously higher than that in undissociated zones. © 2022 University of Petroleum, China. All rights reserved.

引用

页码：41 / 47

页数：6

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