Fracturing Effect Evaluation Technology and Application based on Distributive Tracer

In order to address the difficulty of testing the segmented and layered fracturing productivity in the process of oilfield development,the basic principle of monitoring and evaluating the fracturing effects based on distribution tracer and the supporting process technology are researched,and different types of distribution tracers are injected during the fracturing process.According to the parameters such as the output of tracers,flowback liquid production,and contribution rate,the oil-water production profile and fracture information are determined,thus the segmented (layered) fracturing effect of oil and gas wells are analyzed and judged.Finally,this technology is applied to monitor and evaluate the fracturing effect of Jian* well in Changqing Oilfield.The research results show that the 54 tracer production concentration curves of 27 fracturing sections in Jian*Well can be divided into four categories:parabolic single sharp peak curve, parabolic single broad peak curve,parabolic multi-peak curve,and peakless curve.By monitoring distributive tracer,intuitive results of horizontal well’s segmented productivity contribution can be obtained.This technology can be used for dynamic monitoring of formation water,fracturing fluid,and crude oil production during segmented fracturing in horizontal wells and layered fracturing in vertical wells,conducive to accurately evaluating the effectiveness of fracturing,optimizing fracturing schemes and determining interwell connectivity.