Application of Inter-Well Frac-Hits Evaluation Based on Frac-Hits Index Calculation in Sichuan Shale Gas Wells

In order to tackle the key technology of effective exploitation of deep shale gas and study a practical and reliable method that can be used to monitor the water production contribution of shale gas wells in Sichuan and evaluate interwell frac-hits, this paper proposes a calculation method of interwell frac-hits index, which can be used to quantitatively evaluate interwell frac-hits of shale gas wells, in view of the poor accuracy of existing methods for evaluating interwell frac-hits and the shortcomings of delaying the normal production of platform wells during well testing. The tracer monitoring and testing results, such as the number of connected sections, time, concentration, cycle and recovery rate, are used to quantitatively evaluate the connectivity and connectivity between fractured wells in shale gas wells; Based on the results of logging interpretation, the main controlling factors affecting interwell interference were identified. The research results indicate that the main factors affecting interwell interference include natural fractures and fracturing scale, with natural fractures having a relatively greater impact. According to the comprehensive evaluation analysis, the interwell frac-hits evaluation method in this paper can be used for qualitative evaluation of interwell frac-hits of shale gas wells in Sichuan, providing reference and guidance for the weight analysis of the influencing factors of multi well interference in the next well block and the big data test results of the study on the connectivity interference rule.