Extracting mud invasion information using borehole radar — A numerical study

In hydrocarbon drilling, mud filtrate penetrates permeable formations and alters the pore fluid characteristics in immediate vicinity of borehole. Typically, prevailing situ fluids are displaced by invading filtrate, which leads to gradually changing distributions electrical properties. Understanding this invasion process is crucial for interpretation logging data associated reservoir evaluations. Conventional methods tend be inadequate purpose as their resolution too low. We find that depth can determined from borehole radar using an optimized antenna configuration time-lapse measurements. A series parametric sensitivity analyses provide information about effects variations rock properties on identification extraction signals reflected front. Our results suggest embedding antennas cavities filled with absorbing dielectric material, it possible minimize interference arising metal components tool. simulated scenario, a measurement mode time interval at least 6 h reliably extract front, proposed has lateral detection range 0.15 1 m. comprehensive indicates front principally influenced oil viscosity, porosity, formation water salinity, well molecular diffusion coefficient cementation exponent. These parameters should carefully explored assessed when applying evaluate environment.