封闭边界压裂水平井非稳态产能评价新模型

Non-steady productivity analysis model for fractured horizontal well in closed boundary

何军 范子菲 何聪鸽 张安刚 郝峰军 张新顺 刘丽 徐立坤

中国石油勘探开发研究院，北京 100083

Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

在压裂水平井垂直裂缝等效井径模型的基础上，应用镜像反演理论及压降叠加原理，建立了矩形封闭地层压裂水平井产能分析方法；利用数值求解，得到了压裂水平井各条裂缝的产量变化规律，并分析了压裂水平井产能影响因素。结果表明：压裂水平井初期产能高，产量递减快，之后产量趋于平缓；生产初期，各条裂缝产量相差不大，压裂水平井产量随裂缝条数的增加而增加，而各条裂缝间的产量差距随生产时间延长逐渐增大，表现为边部裂缝产量高，中间裂缝产量低；压裂水平井产能受裂缝条数、无因次裂缝导流能力、裂缝缝长的综合影响，其中裂缝条数和无因次裂缝导流能力对压裂水平井产能影响较大，裂缝缝长对压裂水平井产能影响相对较小。

Based on the equivalent wellbore radius of fractured horizontal well, a new productivity method of a fractured horizontal well in rectangular closed formation was developed by applying mirror reflection theory and superposition principle of pressure drop. By using numerical solution, the production variation law of each fracture in fractured horizontal wells was obtained, and the factors affecting the productivity of fractured horizontal wells are analyzed. The results show that fractured horizontal well has a high productivity and a sharp drop at initial time, and then the productivity tends to be steady. At initial time, there is little difference between the productivities of each fracture, and the total productivity increases with the fracture number. With time passing by, the productivity gap is gradually increasing, manifesting that the outer fractures had higher productivities compared with the inner fractures. Finally, the productivity of fractured horizontal well is subjected to the combined influences of fracture number, fracture conductivity capacity and fracture length. The fracture number and fracture conductivity capacity have more significant influence than fracture length.

10.6056/dkyqt202103015