摘要
高压水射流技术具有工作介质来源广泛与环保等优点,能够用于海底天然气水合物储层破碎。本文运用LSDYNA有限元程序对淹没状态下高压水射流对海洋天然气水合物沉积物破碎过程进行数值模拟,研究了射流速度、喷嘴直径、靶距、入射角度4项关键参数对含水合物沉积物冲蚀体积的影响,得出以下主要结论:含水合物沉积物破碎需要满足射流速度大于临界流速;随着射流速度的增加冲蚀体积逐渐增大;喷嘴直径的增加会导致沉积物径向冲蚀体积的增大,从而使总体冲蚀体积增大;靶距的增加会使水射流在水域运动过程中能量损失增大,导致冲蚀体积的减小;在喷嘴入射角度增大过程中冲蚀体积先增大后减小最后趋于稳定,当入射角度为10°时冲蚀体积能够达到最大值。
The high-pressure water jet technology provides many advantages such as a wide range of working mediums, environmental-soundness, and can be used to break the submarine gas hydrate formations. In this paper, the LS-DYNA finite element program is used to simulate the fragmentation process of submarine gas hydrate formations with high-pressure water jets under the submerged condition. The effects of four key parameters(jet velocity, nozzle diameter, target distance and incident angle) on the erosion volume of hydrate formations are studied. The following conclusions are drawn: the requirement that jet velocity is higher than the critical velocity needs to be met for fragmentation of hydrate sediments;the erosion volume gradually increases with the increase of jet velocity;the increase of nozzle diameter will lead to the increase of the radial erosion volume of formations, hence the overall erosion volume;the increase of target distance will increase the energy loss of water jets in the process of water movement, leading to the decrease of the erosion volume;the erosion volume will increase first and then decrease with the increase of nozzle incidence angle, eventually becoming stable. When the incident angle is 10°, the erosion volume can reach the maximum value.
作者
靳成才
陈晨
潘栋彬
朱颖
李曦桐
钟秀平
张晗
张颖
JIN Chengcai;CHEN Chen;PAN Dongbin;ZHU Ying;LI Xitong;ZHONG Xiuping;ZHANG Han;ZHANG Ying(College of Construction Engineering, Jilin University, Changchun Jilin 130026, China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions of Ministry ofNatural Resources, Changchun Jilin 130026, China;State Key Laboratory of Superhard Materials, Changchun Jilin 130026, China)
出处
《探矿工程（岩土钻掘工程）》
2019年第5期1-7,共7页
Exploration Engineering:Rock & Soil Drilling and Tunneling
基金
国家自然科学基金面上项目“高压低温水射流作用下海底天然气水合物储层破岩过程与机理研究”(编号:41672361)
吉林省科技发展计划项目,国际科技合作项目“海洋天然气水合物置换开采关键技术研究”(编号:20170414044GH)
关键词
水射流参数
天然气水合物沉积物
流固耦合
数值模拟
冲蚀体积
water jet parameters
gas hydrate sediments
fluid-solid coupling
numerical simulation
erosion volume
