吸力锚贯入引发的浅层水合物解离和储层孔隙压力再分布研究  

Study of Shallow Marine Hydrate Dissociation and Reservoir Pore Pressure Redistribution Induced by Suction Anchor Penetration

作　　者：韩树鑫 邓学晶[1] 李望晨 于龙[2] 管龙飞 HAN Shuxin;DENG Xuejing;LI Wangchen;YU Long;GUAN Longfei(College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,青岛266580 [2]大连理工大学海岸和近海工程国家重点实验室,大连116024

出　　处：《中国造船》2024年第3期197-204,共8页Shipbuilding of China

基　　金：大连理工大学海岸和近海工程国家重点实验室开放基金项目(LP2209)。

摘　　要：采用多物理场耦合数值模拟方法,分析了深水吸力锚安装引起的海洋水合物解离和储层孔隙压力的变化。研究表明:吸力锚的安装负压导致储层孔隙压力降低,进而诱发水合物解离;最初波及的浅层水合物解离速率最大;水合物解离产生的大量气体使储层孔隙压力下降缓慢,造成安装负压损失;随着安装负压波及区域的增大,水合物解离范围从浅层向深层逐渐扩大。A multi-physics field coupled numerical simulation method is adopted to analyze marine hydrate dissociation and pressure change in the reservoir pore induced by the installation of a deepwater suction anchor,which is widely applied in deepwater oil and gas engineering.It is shown that the negative pressure induced by the installation of the suction anchor leads to the reduction of the pressure in the reservoir pore,which in turn induces hydrate dissociation.However,a large amount of gas produced due to hydrate dissociation will slow down the decrease of the reservoir pore pressure and result in the loss of negative pressure in the installation.As the area affected by the negative pressure increases,the range of hydrate dissociation gradually expands from a shallow layer to a deeper one,with the maximum rate of hydrate dissociation occurring in the initially affected shallow layer.

关 键 词：吸力锚负压安装 水合物解离 压力分布 多场耦合 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]