This work established a geological model for the 5th member of the Xujiahe Formation（X5 member） in the Xinchang gas field of the West Sichuan Depression based on the lithological, structural and depositional propert...This work established a geological model for the 5th member of the Xujiahe Formation（X5 member） in the Xinchang gas field of the West Sichuan Depression based on the lithological, structural and depositional properties, as well as logging and well completion data and drill-core observations. Rock mechanical parameters were calculated according to rock mechanic experiments and rock mechanic interpretations from logging data. We also calculated the magnitudes and orientations of the in situ stresses based on acoustic emission tests, differential strain tests, fracturing behaviour and logging interpretations as well as anisotropy logging tests, borehole-breakout measurements and well-log data. Additionally, the present stress field of the X5 member was simulated using finite element numerical（FEM） simulation methods. The numerical simulation results indicate that the distributions of lithology and fractures are key factors that influence the present stress field. The stress field in the study area is discontinuous as a result of fractures and faults in the central and eastern areas. Stress is concentrated at the end sections and bends of faults, but dissipates with distance away from both sides of the faults. A longitudinal profile clearly demonstrates the zonality and continuity of the stress field and an increase with depth. The differential stress distribution is relatively uniform; however, large deviations occur in fracture zones.展开更多
针对航天器姿态控制系统的设计需要,利用开源软件OpenFOAM搭建用于充液航天器刚-液耦合计算的仿真软件。在动边界问题中,推导出非惯性系下的N-S方程,避免了传统CFD软件中动网格法所带来的大量网格转换计算,提高软件计算效率。采用PIMPLE...针对航天器姿态控制系统的设计需要,利用开源软件OpenFOAM搭建用于充液航天器刚-液耦合计算的仿真软件。在动边界问题中,推导出非惯性系下的N-S方程,避免了传统CFD软件中动网格法所带来的大量网格转换计算,提高软件计算效率。采用PIMPLE(pressure implicit with splitting of operators,semi-implicit method for pressure linked equations)算法搭建了晃动力求解模块,采用变步长龙格库塔法搭建了姿态运动模块,实现航天器的基于CFD方法的刚-液耦合仿真。利用该软件对相关算例进行了数值仿真,其结果与基于等效力学模型的刚-液耦合程序以及商业软件的计算结果吻合良好。展开更多
基金financially supported by the State Key Lab of Oil and Gas Reservoir Geology and Exploitationfunded by the National Natural Science of China(grant No.41572130)
文摘This work established a geological model for the 5th member of the Xujiahe Formation（X5 member） in the Xinchang gas field of the West Sichuan Depression based on the lithological, structural and depositional properties, as well as logging and well completion data and drill-core observations. Rock mechanical parameters were calculated according to rock mechanic experiments and rock mechanic interpretations from logging data. We also calculated the magnitudes and orientations of the in situ stresses based on acoustic emission tests, differential strain tests, fracturing behaviour and logging interpretations as well as anisotropy logging tests, borehole-breakout measurements and well-log data. Additionally, the present stress field of the X5 member was simulated using finite element numerical（FEM） simulation methods. The numerical simulation results indicate that the distributions of lithology and fractures are key factors that influence the present stress field. The stress field in the study area is discontinuous as a result of fractures and faults in the central and eastern areas. Stress is concentrated at the end sections and bends of faults, but dissipates with distance away from both sides of the faults. A longitudinal profile clearly demonstrates the zonality and continuity of the stress field and an increase with depth. The differential stress distribution is relatively uniform; however, large deviations occur in fracture zones.
文摘针对航天器姿态控制系统的设计需要,利用开源软件OpenFOAM搭建用于充液航天器刚-液耦合计算的仿真软件。在动边界问题中,推导出非惯性系下的N-S方程,避免了传统CFD软件中动网格法所带来的大量网格转换计算,提高软件计算效率。采用PIMPLE(pressure implicit with splitting of operators,semi-implicit method for pressure linked equations)算法搭建了晃动力求解模块,采用变步长龙格库塔法搭建了姿态运动模块,实现航天器的基于CFD方法的刚-液耦合仿真。利用该软件对相关算例进行了数值仿真,其结果与基于等效力学模型的刚-液耦合程序以及商业软件的计算结果吻合良好。
