渤海南部油田部分中轻质油藏储层物性非均质性较强，强非均质性导致水平井段储量动用程度出现差异大、开发效果差的问题。针对上述问题，在水平井测试数据缺少的条件下,利用流管法绘制不同储层物性条件下水平井含水率与采出程度理论关系曲线,通过实际生产数据与理论曲线对比，定性评价水平段储量动用程度，在此基础上,以渗透率级差和低渗段储量比例建立了水平段剩余可采程度预测图版,并引入评价参数——低渗段剩余可采程度,将水平井段储量动用程度及挖潜潜力大小定量划分为4种类型,并制定了相应挖潜策略。研究成果在BZ油田现场应用,取得了日增油265 m3的较好效果，可为中轻质油藏的水平井挖潜提供一定借鉴。

Due to the fact that the heterogeneity of some light oil reservoirs in the southern Bohai oilfield is strong and the difference of production in horizontal well section is obvious, the development effect of horizontal wells is poor. But there are few horizontal well test data at present. Aiming at the problem, the research and application of a new method for evaluating the production degree of horizontal well have been carried out using reservoir engineering methods. The theoretical relationship curve between water cut and recovery degree of horizontal well under different reservoir physical properties is calculated using multi-flow tube model. Based on this theoretical curve, the uneven production degree of horizontal section is qualitatively evaluated. On this basis, the permeability gradient and reserve proportion of low permeability section are used as the main controlling factors for the production degree of horizontal well, and a prediction chart of the remaining recoverable degree of the horizontal section is established. An evaluation parameters—the remaining recoverable degree of the low-permeability section—is introduced to quantitatively evaluate the production degree of horizontal well and the subsequent tapping potential. According to the tapping potential of remaining oil, the production degree of horizontal well can be divided into four types, corresponding to different potential tapping strategies. The research has been applied in the BZ oilfield, effectively guiding to tapping the remaining oil potential of horizontal wells. After the adjustment, the total daily oil production of BZ oilfield has been increased by 265 cubic meters per day.