水平井中心管完井生产段流动耦合模型

Flowing Coupled Model for Production Section of Horizontal Well's Completion With Central Tube

水平井生产井段存在压降导致井筒压力和流量分布不均。考虑中心管完井对水平生产井段流动的影响,根据等效井径、势的叠加原理,建立了中心管完井3维条件下油藏渗流和井筒复杂流动耦合模型。通过模型求解,给出了井筒入流分布和压力分布。实例结果表明,当中心管长度约为水平生产井段长度的1/3时,中心管完井能够降低跟端处的大压差,有效改善入流剖面和压力剖面。

The existence of pressure drop at production section of the horizontal well results in uneven distribution of pressure and flow.Considering influence of well completion with center tube on the flow of horizontal section and according to the principles of equivalent well diameter and the potential of the superposition,a coupling model of 3D complex flow reservoir and wellbore complex flow under the conditions of completion with central tube has been established.By solving the model wellbore inflow and pressure distribution are given.Examples shows that when the length of central tube reaches to 1/3 of the horizontal section length approximately,the completion with central tube can reduce the large pressure difference at the,improves the inflow profile and pressure profile effectively.