Abstract: The horizontal well productivity prediction method was analyzed in theory. However, the existing mathematical model and evaluation method does not consider the influence of startup pressure gradient and the pressuresensitive effect on fracturing horizontal well productivity, which is not reasonable in low permeability reservoirs. A method considering the effect of startup pressure gradient and the pressure sensitive was provided in this paper. The results showed that the larger the startup pressure gradient, the greater impact on the fracturing of the horizontal well productivity. Therefore, when the fracturing horizontal well productivity model was established in low permeability reservoir, the parameters of startup pressure gradient must be considered. The larger integrated compression coefficient, the greater impact on fracturing horizontal well productivity. The greater the pressure drop, the influence on coefficient of the comprehensive capacity is larger. Therefore, when the elastic reservoir was exploited, a feasibility of optimization design of production pressure were needed. The best crack number was 4~5, and crack length was about 120 m.

Key words: Fractured horizontal well,    ,  Productivity,    ,  Low permeability reservoir,     ,  Prediction

摘要： 对水平井产能优化预测方法进行了理论分析, 现有的数学模型和评价方法不考虑启动压力梯度和压 敏效应对压裂水平井产能的影响, 在低渗透油藏中是不合理的。本文提供了一个考虑启动压力梯度和压敏效应的 方法, 更加精确地预测低渗透油藏中压裂水平井的产能, 并研究分析启动压力梯度、 压缩系数和裂缝参数等对产能 的影响。结果表明, 启动压力梯度越大, 对压裂水平井的产能影响越大。因此, 建立低渗透油藏压裂水平井产能模 型时, 必须考虑启动压力梯度参数。综合压缩系数越大, 对压裂水平井产能影响越大, 压降越大, 其综合压缩系数对 产能的影响越大。因此, 弹性开采油藏, 需要对生产压差进行可行性优化设计, 裂缝的最佳条数是4~5条, 裂缝长度 约1 2 0m。

关键词: 压裂水平井, 产能, 低渗透, 预测