一种新型的产能递减曲线研究

在总结H递减曲线优缺点的基础上，针对其存在的缺陷，通过理论推导对其进行修正完善，得到了一种新型的、符合守恒定律的产能递减曲线类型，并给出了相应的递减参数求解方法。最后，分别用H曲线和修正曲线对一口压裂水平气井产能递减阶段的产量进行预测计算，并与数值模拟结果进行拟舍分析，结果表明：提出的修正递减曲线，一方面保持了H递减曲线能够在递减初期与产量上升或稳产阶段产量平滑衔接的优点，另一方面又弥补了H递减曲线自身存在的在难以精确确定递减0时刻的情况下进行预测产生较大误差的缺陷，从而使修正的递减曲线预测精度更高，使用范围更加广泛，可以用来实例预测计算。

Research on a New Type of Production Rate Decline Curve

Based on evaluating the H production rate decline curve, this paper focuses on the curve's limitations and adjusts it by theory derivation. A new type of production rate decline curve, which accords with the conservation principle, and its decline factor solution are shown in this paper. The H production rate decline curve and adjusted curve are then used to predict the production of a fractured horizontal gas well in the stage of production rate decline. Finally, a match analysis is used between the results of this calculation and numerical simulation. The results show that on the one hand the new decline curve suggested by this paper keeps the merit of the H decline curve of linking smoothly between initial decline period and production ascending period or stable production period, on the other hand it makes up the defect of the H decline curve of producing large prediction error when the decline time point 0 cannot be decided precisely. By using this new method, the prediction precision is enhanced, and the application scope is enlarged. This new type of production rate decline curve can be used in practical prediction calculation.