According to the production performance of horizontal wells in gas cap and edge water reservoir, the development effect of eight horizontal wells which have been put into production presents a characteristic that " four wells produce well and four wells produce badly". In order to find the reasons that lead to the productivity difference of horizontal well, geological features, the formation energy and the well trajectory has been analyzed, the formation condition near the horizontal well which have high productivity is good, there are injection wells around the horizontal well, and the well trajectory penetrates sand formation; The productivity calculation formulas are used to analyze the effect of formation physical property, for the formation with interlayer, the theory formula will cause large errors. Based on the analysis results, suggestions on infill well site of horizontal well are presented.%对某气顶边水油藏已投产的水平井生产动态进行分析,总结了已投产八口水平井“四好四差”的开发特征,从地质特征、地层能量和井眼轨迹三方面分析了已投产水平井产能存在差别的原因.开发效果好的水平井附近地层物性较好,周围有注水井补充地层能量,井眼轨迹基本上穿透砂层.利用产能公式计算结果分析了水平井产能影响因素,对于隔夹层发育地层,理论公式计算误差较大；若水平井周围存在能量供应,则考虑供给边界距离对产能的影响.综合地质分析和理论计算结果,提出了水平井加密井位选取建议.
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