页岩气井重复压裂选井评价模型研究及应用

为解决页岩气井重复压裂选井问题，针对页岩气井储层断层发育、曲率及裂缝分布复杂等地质特征，引入了多孔弹性应力转向系数、单位压降产量与压力系数、气藏质量指数、归一化拟产量递减率等评价指标，建立了页岩气井适用性较强的重复压裂选井评价模型，并优选了重复压裂候选井。同时，明确了重复压裂工艺试验井挤注、主压阶段暂堵转向工艺技术思路，优化了重复压裂工艺设计参数。该模型应用于涪陵页岩气开发井重复压裂选井中，对优选的候选井进行重复压裂改造，投产初期日产量比原来提高了5～6倍，为涪陵页岩气田长期高效开发提供了技术参考和借鉴。

Refracturing selection evaluation model for shale gas wells and its application

In order to solve the problem of refracturing well selection in shale gas wells, the evaluation indexes such as the porous elastic stress steering coefficient, unit pressure drop yield, pressure coefficient, gas reservoir quality index and normalized pseudo-production decline rate were introduced for geological features of shale gas wells such as reservoir fault development, curvature and fracture distribution. The evaluation model of refracturing well selection for shale gas wells was established, and the candidate wells for refracturing were selected. At the same time, the technology of temporary plugging diverting technology in refracturing wells was clarified, and the design parameters of the refracturing process were optimized. This model was applied to the refracturing of Fuling shale gas well, and the optimized candidate wells can be retrofit. The daily output was increased by 5-6 times in the early stage of operation, which provided a reference for the long-term and efficient development of Fuling shale gas field.