Wellbore section module allows a customer to carry out the analytical procedures for development control. Using these procedures a customer can trace changing of reservoir saturation, discover working intervals, reveal condition of wellbore and so on. Moreover, this important tool provides complex analysis of investigations made at different time and by different methods. Examples display thermo-method for determination of working perforation intervals (fig.23.1) and the usage of isotope method to reveal out-of-the-tube circulations (fig.23.2).