海底管线天然气泄漏过程数值模拟  

Numerical Simulation of Natural Gas Leakage in Subsea Pipelines

作　　者：文闯[1] 延斌[2] 王宪全 张玉蛟[4] 王树立[1] 杨燕[1] 

机构地区：[1]江苏省油气储运技术重点实验室(常州大学),江苏常州213016 [2]中石化石油工程设计有限公司,山东东营257026 [3]胜利油田胜东社区辛兴物业公司,山东东营257000 [4]中国石油管道公司,河北廊坊065000

出　　处：《常州大学学报（自然科学版）》2015年第2期72-77,共6页Journal of Changzhou University：Natural Science Edition

基　　金：国家自然科学基金项目资助(51444005);常州大学校基金项目资助(ZMF13020057)

摘　　要：采用VOF(Volume Of Fluid)多相流模型对海底管线天然气泄漏过程进行了数值模拟研究,通过实验验证了数学模型的准确性和可靠性。结果表明:在泄漏初期天然气上升的同时也会横向扩散并逐渐形成直径为1.92m一个气团,随后气团脱离泄漏口继续向上运动,气团将分裂为多个小气团,海水将占据小气团之间的空隙。气团两侧会产生回流,气液两种流体之间形成强烈的湍流运动,加强天然气和海水的混合,造成天然气泄漏过程中气液两相之间的相互渗透。泄漏流量的增大将导致天然气从泄漏口运动到自由表面所需时间的减小,特别是在流量较小时,下降幅度较为迅速。The leakage process of natural gas in subsea pipelines was numerically simulated using the Vol- ume Of Fluid （VOF） multiphase flow model. The numerical results were in good agreements with the ex- perimental data verifying the accuracy and reliability of our developed mathematical model. The results showed that the natural gas went up in the seawater along with the horizontal diffusion in the preliminary stage of gas leakage. The motion formed a gas mass with the maximum diameter of 1.92m. Then, the gas mass broke away from the leak hole and rose to the surface sequentially. In the rise process, the gas mass broke up and formed some small gas masses. The seawater occupied the interspace between the small gas masses. Moreover, the backflow appeared in both sides of the gas masses and resulted in the strong turbu- lence motion. The turbulence enhanced the mixture of the natural gas and seawater and caused the perme- ation of the gas and liquid two phase flow in the leakage process in subsea pipelines. The increase of the leakage mass flow rate caused the decline of the required time of natural gas moving to the surface from the leakage hole. Especially, it declined quickly when the mass flow rate was small.

关 键 词：海底管线 天然气 泄漏 VOF模型 

分 类 号：TE88[石油与天然气工程—油气储运工程]