为构建实时动态的深水铺管作业视景仿真系统,本文以"海洋石油201"铺管船为研究对象,考虑船舶运动、波浪载荷、海流载荷以及动力定位等对管线和初始缆的动态影响,建立了管道和缆索动态的微分方程组。利用梁理论,对管道振动特...为构建实时动态的深水铺管作业视景仿真系统,本文以"海洋石油201"铺管船为研究对象,考虑船舶运动、波浪载荷、海流载荷以及动力定位等对管线和初始缆的动态影响,建立了管道和缆索动态的微分方程组。利用梁理论,对管道振动特性进行分析,建立了管道振动方程。基于微分求积法确定微分方程组边界条件,利用显式差分法迭代获得振动方程数值解。通过仿真实验分析了不同海况、工况下管道的形态以及管道关键位置的作用力;对管道和缆索耦合系统进行分析,并构建了实时计算的初始铺管仿真系统的动态模型。研究结果表明:海况由2 m浪高增加到4 m浪高时,管线最大张力增大了4.55 k N,管道脱离点横向位移增大了41%;海况和船舶运动幅度增大,会加剧管线的振动幅度和持续距离。将仿真结果与商业软件进行对比,误差率保持在4%以内,满足仿真系统的准确性要求。展开更多
A fast explicit finite difference method (FEFDM),derived from the differential equations of one-dimensional steady pipe flow,was presented for calculation of wellhead injection pressure.Recalculation with a traditiona...A fast explicit finite difference method (FEFDM),derived from the differential equations of one-dimensional steady pipe flow,was presented for calculation of wellhead injection pressure.Recalculation with a traditional numerical method of the same equations corroborates well the reliability and rate of FEFDM.Moreover,a flow rate estimate method was developed for the project whose injection rate has not been clearly determined.A wellhead pressure regime determined by this method was successfully applied to the trial injection operations in Shihezi formation of Shenhua CCS Project,which is a good practice verification of FEFDM.At last,this method was used to evaluate the effect of friction and acceleration terms on the flow equation on the wellhead pressure.The result shows that for deep wellbore,the friction term can be omitted when flow rate is low and in a wide range of velocity the acceleration term can always be deleted.It is also shown that with flow rate increasing,the friction term can no longer be neglected.展开更多
文摘为构建实时动态的深水铺管作业视景仿真系统,本文以"海洋石油201"铺管船为研究对象,考虑船舶运动、波浪载荷、海流载荷以及动力定位等对管线和初始缆的动态影响,建立了管道和缆索动态的微分方程组。利用梁理论,对管道振动特性进行分析,建立了管道振动方程。基于微分求积法确定微分方程组边界条件,利用显式差分法迭代获得振动方程数值解。通过仿真实验分析了不同海况、工况下管道的形态以及管道关键位置的作用力;对管道和缆索耦合系统进行分析,并构建了实时计算的初始铺管仿真系统的动态模型。研究结果表明:海况由2 m浪高增加到4 m浪高时,管线最大张力增大了4.55 k N,管道脱离点横向位移增大了41%;海况和船舶运动幅度增大,会加剧管线的振动幅度和持续距离。将仿真结果与商业软件进行对比,误差率保持在4%以内,满足仿真系统的准确性要求。
基金Project(Z110803)supported by the State Key Laboratory of Geomechanics and Geotechnical Engineering,ChinaProject(2008AA062303)supported by the National High Technology Research and Development Program of China
文摘A fast explicit finite difference method (FEFDM),derived from the differential equations of one-dimensional steady pipe flow,was presented for calculation of wellhead injection pressure.Recalculation with a traditional numerical method of the same equations corroborates well the reliability and rate of FEFDM.Moreover,a flow rate estimate method was developed for the project whose injection rate has not been clearly determined.A wellhead pressure regime determined by this method was successfully applied to the trial injection operations in Shihezi formation of Shenhua CCS Project,which is a good practice verification of FEFDM.At last,this method was used to evaluate the effect of friction and acceleration terms on the flow equation on the wellhead pressure.The result shows that for deep wellbore,the friction term can be omitted when flow rate is low and in a wide range of velocity the acceleration term can always be deleted.It is also shown that with flow rate increasing,the friction term can no longer be neglected.
