Modeling and simulation of behind-casing reservoir detection based on line source

In order to monitor the changes of oil and gas reservoirs in different development stages and meet the requirements of high resolution and long-distance detection for reservoir detection, a three-dimensional radial stratification model based on line source is established in this paper. The effects of radial distance and formation conductivity at different times on the magnetic field strength around the line source, as well as the line source current and relative magnetic permeability of the line source on the detection distance are studied by finite element analysis. The results show that the signal intensity of secondary field at different time has a certain law and corresponding relationship with reservoir conductivity and radial distance. Within a certain range, the larger the current applied to the line source with smaller relative permeability, the stronger the secondary field signal obtained. The research results have certain reference value for the online monitoring of behind-casing reservoir.