Study On Multi-Directional Tracer Quantitative Monitoring Technology For Horizontal Wells With Segmented Fracturing

In recent years,the horizontal well staged fracturing technology has been promoted and applied in major oil fields,significantly improving the development efficiency of lowquality oil reservoirs.However,due to its main reliance on natural energy development,the production capacity of horizontal wells is rapidly decreasing.Therefore,how to effectively supplement reservoir energy is currently the main issue affecting the economic benefits of horizontal well development.At present,water injection is the main method for supplementing energy,so that during the process of supplementing energy,horizontal wells are prone to form a flow channel with surrounding water injection wells,resulting in the rapid occurrence of water channeling and flooding in horizontal wells.Moreover,the specific direction of water inflow and the distribution shape of the flow channel are difficult to determine.According to previous practice,cross well tracing monitoring technology has been proven to be the most cost-effective,simple,and efficient method for quantitatively identifying and monitoring channeling channels.Based on this,this project aims to establish a multi directional tracing quantitative monitoring technology for segmented fracturing horizontal wells,provide feasible methods for quantitative identification and evaluation of channeling channels,and develop corresponding sealing plans based on the identification results to avoid the occurrence of channeling during the later energy replenishment process.Therefore,this project uses a typical irregular water direct combined well network in Yanchang Oilfield as a carrier,and under the premise of conducting suitability evaluation of chemical tracers in the research area,ammonia thiocyanate is determined as a tracer for use in the mine.Then,using reservoir numerical simulation,BP neural network,ion chromatography detection and other technical means,a segmented fracturing horizontal well multi-directional tracer quantitative interpretation model is established,identifying the main formation of 7 channeling channels in the research area,And it will be graded and divided,ultimately providing a theoretical basis for supplementing energy with water injection for segmented fracturing horizontal wells,and providing an important foundation for improving the economic benefits of oilfield horizontal well development.