The problem of bottom water coning shortens water free oil production period and seriously influences productivity, and it becomes the key factor to restrict high effective development of horizontal wells. At present, most bottom water oilfields in China enter middle and high water cut stage and the production declines quickly, however, the traditional water control tool of ICD is only suited for wellbore before water breakthrough and it is valid after water breakthrough. Due to the difficulties of horizontal well ex⁃ploitation, a new autonomous inflow control device(AICD) was developed, which could distinguish fluid only according to fluid prop⁃erties and flow path and limit water production without moving parts. By using CFD software, flow field analysis and sensitivity anal⁃ysis of AICD were carried out. The results show that pressure drawdown produced by flowing water is higher than which produced by flowing oil, and the main reason is that, in the circular chamber, water has higher pressure drawdown produced by high speed ro⁃tation but oil can’t rotate. The fluid sensitivity analysis results show that, the pressure drawdown is mainly determined by fluid vis⁃cosity and flow rate, while the density has little impacts on pressure drawdown, furthermore, the water control ability of AICD is ana⁃lyzed, and the result shows that the more the water content is, the higher the pressure drawdown through water control valve will be.%底水油藏水平井开发过程中出现的底水脊进问题，缩短了底水油藏的无水采油期，严重影响了水平井产能优势的发挥，成为了制约水平井高效开发底水油藏的关键因素。目前我国的大部分底水油田都进入中高含水期，产油量递减加快，而传统的ICD控水工具仅适用于井筒见水前，对于见水后的油井无效。为此，针对目前我国油田水平井开采面临的技术难题和现实问题，研发出了一种新的控水工具——一种新型自动流入控制器，该工具无运动部件仅根据流体性质和流动路径区分流体，限制水的产出。借助CFD软件对新型AICD进行流场分析和敏感性分析，流场分析结果表明：水在新型AICD中流动产生的压降比油在新型AICD中流动产生的压降高，主要原因是水会在工具中高速旋转从而产生更高的压降，而油不会在工具中旋转。对流体的敏感性分析可知，流体流过新型AICD的压降主要是由流体的黏度和流速决定，流体的密度对压降影响很小。通过对新型AICD的控水能力进行分析表明：含水率越高流过控水阀的压降越大。
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