摘要
基于井筒多相流理论,并结合井眼轨迹的计算方法,建立了复杂结构井动态压井数学模型,再采用有限差分法求解,对压井过程中井筒压力进行了模拟研究,认识了初始气侵量、压井液排量与密度、水平井段长度对井筒压力的影响.研究结果表明:在大斜度井和水平井压井过程中,套管承受的压力将会变得更大,且套管承受高压的时间也会明显增长;初始气侵量越大,为平衡井筒压力,压井过程中套管压力和立管压力越大;压井排量越大,压井过程中的套管压力越低,立管压力越大;压井液密度越大,压井过程中套管压力和立管压力越低;水平段长度越长,压井过程中的套管压力越大,压井时间越长.研究结果对保障复杂结构井的压井作业具有指导意义.
Based on the wellbore multiphase flow theory and the calculation method for wellbore trajectories,a dynamic well killing mathematical model for complex well structures was established,and the finite difference method was used to solve it.The wellbore pressures during the well killing process were simulated and studied,and the influences of initial gas influxes,kill fluid displacements and densities,and horizontal well lengths on the wellbore pressures were studied.The research results show that,for high inclination and horizontal wells,the casing pressures will become larger and the casing time will increase significantly in the process of killing well.The larger the initial gas inflow is,the higher the casing pressures and riser pressures will be,to balance the wellbore pressures.The higher the killing capacity is,the lower the casing pressure and the higher the riser pressure will be.The higher the kill fluid density is,the lower the casing pressures and riser pressures will be.The longer the horizontal section length is,the greater the casing pressures and the longer the kill time will be.The work has guiding significance to ensure the well killing operation of complex structure wells.
作者
杨鹏飞
毛良杰
杨森
陈雪峰
YANG Pengfei;MAO Liangjie;YANG Sen;CHEN Xuefeng(School of Oil&Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,P.R.China;Development Department,Petro China Southwest Oil&Gasfield Company,Chengdu 610000,P.R.China;CNPC Engineering Technology Research Company Limited,Beijing 102200,P.R.China)
出处
《应用数学和力学》
北大核心
2025年第2期254-270,共17页
Applied Mathematics and Mechanics
基金
国家自然科学基金(52174006)
四川省重点研发项目(S0497,2022YFG0119)。
关键词
复杂结构井
动态压井
井眼轨迹
井筒压力
complex structure well
dynamic killing well
well trajectory
wellbore pressure
