Evaluation and Optimization Suggestions of Multi-cluster Equilibrium of Segmented Fracturing Based on Optical Fiber Monitoring
As part of hydraulic fracture field labs(HFFL)of Qingcheng shale oil,the DAS and DTS distributed optical fiber monitoring data collected from the permanent optical cable deployed outside the casing during the fracturing process of this horizontal well can be used to evaluate the dynamic changes in multi-cluster sand-fluid distribution under the segmented multi-cluster fracturing mode of horizontal wells.Based on the corresponding technical principles,this paper elaborates on the theoretical foundation of DAS and DTS measurements and the calculation models for fluid and sand influx into each cluster during hydraulic fracturing.It proposes a calculation method for the uniformity index of multi-cluster fractures,clarifies several key concepts,and identifies the impact of factors such as segment-cluster design,perforation optimization,temporary plugging,and flow rate changes on the balance of multi-cluster fractures.Combined with actual field applications,several insights are gained:1)Optical fiber technology is currently the most effective and intuitive technology for evaluating the distribution patterns of multi-cluster sand-fluid,enabling accurate quantification of the balance of multi-cluster propagation;2)All clusters in Qingcheng shale oil fields show fluid influx signals,indicating 100%initiation and fluid influx;3)There are significant differences in fluid and sand influx distribution among clusters,with a calculated uniformity index ranging from 30%to 87%,averaging 61.8%,indicating room for improvement;4)Sweet spot quality,segment-cluster design,and perforation are key factors affecting fluid and sand influx,while the effect of temporary plugging is not significant.The application examples presented in this paper provide an important basis for subsequent adjustments to development plans and optimization of fracturing designs,while also contributing to the further expansion and in-depth application of distributed optical fiber monitoring technology in the domestic unconventional oil and gas sector.
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