Computation of time-dependent AIT responses for various reservoirs using dynamic invasion model

Abstract

When a formation was opened, the drill mud was used and invasion occurred during the process of well drilling in the petroleum prospection. Since the dynamic invasion process changes with time during drilling while mud filtrate was used, the logging response is time dependent. Dynamic invasion responses of Array Induction Tools (AIT) were modeled and programmed to study the effects of mud filtrate invading into a reservoir dynamically on AIT and sight into the behaviors of responses during dynamic invasion for the new array induction tools. The characters of AIT responses were discussed for the cases of mud filtrate invading into an oil reservoir, a water zone, and a reservoir containing both water and hydrocarbon, respectively. The present computation model provides the foundational behaviors for reservoir evaluation. © 2012 Springer-Verlag GmbH.