天然气水合物沉积物不排水剪切特性的离散元模拟

doi:10.7623/syxb202101007

石油学报 ›› 2021, Vol. 42 ›› Issue (1): 73-83.DOI: 10.7623/syxb202101007

天然气水合物沉积物不排水剪切特性的离散元模拟

周世琛¹, 郇筱林¹, 陈宇琪¹, 周博¹, 薛世峰¹, 公彬^2,3

1. 中国石油大学(华东)储运与建筑工程学院山东青岛 266580;
2. 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地山东青岛 266590;
3. 长崎大学工学部地盘环境研究室日本长崎 852-8521

收稿日期:2019-10-26 修回日期:2020-06-24 出版日期:2021-01-25 发布日期:2021-02-05
通讯作者: 周博,男,1972年5月生,1995年获大连理工大学学士学位,2007年获韩国金乌工业大学博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事油气井工程力学、智能材料与结构、计算力学等方面的研究。Email:zhoubo@upc.edu.cn;薛世峰,男,1963年10月生,1984年获天津大学学士学位,2000年获中国地震局地质研究所博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事油气井工程力学、断裂力学、计算力学等方面的研究。Email:sfeng@upc.edu.cn
作者简介:周世琛,男,1987年2月生,2010年获中国石油大学(华东)学士学位,2013年获中国石油大学(华东)硕士学位,现为中国石油大学(华东)博士研究生,主要从事天然气水合物沉积物力学特性的多尺度研究。Email:zscupc@126.com
基金资助:
国家重点研发计划项目（2017YFC0307604）和中国石油大学（华东）研究生创新工程项目（YCX2020071）资助。

DEM simulation on undrained shear characteristics of natural gas hydrate bearing sediments

Zhou Shichen¹, Huan Xiaolin¹, Chen Yuqi¹, Zhou Bo¹, Xue Shifeng¹, Gong Bin^2,3

1. College of Pipeline and Civil Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
2. Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Shandong Qingdao 266590, China;
3. Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan

Received:2019-10-26 Revised:2020-06-24 Online:2021-01-25 Published:2021-02-05

摘要/Abstract

摘要： 天然气水合物资源广泛分布于深海浅层沉积物中，具有储量大、能量密度高、燃烧清洁等优点，是一种极具开发前景的环保能源，深入研究天然气水合物沉积物的力学特性是实现天然气水合物资源安全开采的重要前提。利用常体积方法对天然气水合物沉积物的不排水剪切特性进行了离散元模拟，并依据物理实验结果对数值模拟结果进行了标定，最后对剪切过程中的细观力学机制进行了分析。研究结果表明，离散元模拟能够有效地反映水合物沉积物试样和砂土试样在不排水条件下的宏观力学特性；在剪切过程中，水合物沉积物试样和砂土试样的平均配位数先减小后增加直至达到相对稳定值，而由于水合物的胶结作用，前者配位数的变化幅度较大；接触力链网络初始以环状力链为主，接着以柱状强力链为主，最后以屈曲力链为主；组构异性的演化规律与外部载荷关系密切，接触法向和法向接触力的组构异性的主方向平行于外部荷载方向，而且法向接触力的数值比切向接触力的数值高一个数量级。

关键词: 天然气水合物沉积物, 不排水条件, 宏观力学行为, 离散元, 细观力学机制

Abstract: Natural gas hydrate (NGH), commonly found in deep-sea sediments, has been identified as a promising energy resource due to its abundance in nature, high energy density and clean combustion, and it is crucial for exploring the underlying mechanical properties of natural gas hydrate bearing sediments (NGHBS)for gas recovery. This study aims to investigate the undrained shear behaviors of NGHBS using the discrete element method (DEM). The constant volume method was adopted to simulate the undrained conditions. A series of DEM simulations of biaxial compression tests were performed and then the macromechanical behaviors of NGHBS were presented and verified, and finally mesomechanical mechanisms during shear were examined. The results highlighted that (1)the DEM simulation can effectively reflect the macromechanical properties of NGHBS under undrained conditions; (2)the average mechanical coordination numbers of all samples decrease initially and then increase until it reaches a relatively stable value during shear, and NGHBS samples show greater variances in coordination number compared with sand samples because of the hydrate cementation effect; (3)the force chain network is composed of nearly circular force chains at initial state and then featured by column-like structures and finally consists mostly of buckling force chains; (4)the fabric anisotropy is closely related with the direction of external loading, and the principal directions of fabric anisotropy of contact normals and normal contact forces are parallel with the direction of external loading. Besides, the values of normal contact forces are about an order of magnitude higher than that of the tangential contact forces.

Key words: natural gas hydrate bearing sediments, undrained condition, macromechanical properties, discrete element method, mesomechanical mechanism

中图分类号:

TE133

周世琛, 郇筱林, 陈宇琪, 周博, 薛世峰, 公彬. 天然气水合物沉积物不排水剪切特性的离散元模拟[J]. 石油学报, 2021, 42(1): 73-83.

Zhou Shichen, Huan Xiaolin, Chen Yuqi, Zhou Bo, Xue Shifeng, Gong Bin. DEM simulation on undrained shear characteristics of natural gas hydrate bearing sediments[J]. Acta Petrolei Sinica, 2021, 42(1): 73-83.

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天然气水合物沉积物不排水剪切特性的离散元模拟

DEM simulation on undrained shear characteristics of natural gas hydrate bearing sediments

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