通常情况下，水平井的实际井眼轨迹并非绝对水平，而是呈波浪状。 当井筒弯曲程度较大时，重力势能导致其流入动态与理想水平井有较大差异，因此有必要对其进行深入分析。 将井眼轨迹弯曲的水平井近似认为是由一系列斜直井段组成的连续结构，采用油藏-井筒流动耦合半解析模型研究了井眼轨迹弯曲对水平井流入动态的影响规律，并与多分支水平井的计算结果进行了对比。 研究表明，井眼轨迹弯曲会影响水平井的产能和井筒压力分布，导致水平井和多分支水平井的径向流曲线与理想情况有较大差异，其形态随井眼轨迹的变化而波动。

In general case, the actual finishing drilling horizontal well is not absolutely horizontal, the well trajectory is undulant as wave. When the wellbore bending degree is big, gravitational potential energy causes the bigger difference of inflow performance than the ideal horizontal wells. Therefore, it is necessary to do in-depth analysis of the horizontal well inflow performance. The horizontal well with curved trajectory was approximately regarded as a continuous structure which is composed of a series of slant wells. By using the reservoir-wellbore flow coupling semi-analytical model, this paper studied the effects of well trajectory bending on horizontal well inflow performance, and compared the calculation results with the multi-branch horizontal wells. The result shows that well trajectory bending will affect the productivity of horizontal wells and wellbore pressure distribution, the radial inflow curves of horizontal wells and multi-branch horizontal wells have a big difference with ideal situation, and the shape fluctuates with well trajectory changes.