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Calculating The Mud Drilling Invasion Through Geophysical Well Logs In Theoretical Reservoirs Models
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 11th International Congress of the Brazilian Geophysical Society, Aug 2009, cp-195-00004
Abstract
During drilling process, muds of different compositions are used, aiming to support the wall and to remove the debris originated by the action of the bit. These muds invade the geological formations and modify the well surrounding zones, mainly, in terms of porosity and permeability. In the present work, we used the approach developed by Ribeiro (2007) to determine the invasion diameter, which is similar to Tornado Charts methodology utilized by SCHLUMBERGER, inclusive, using the same ILD and LLD well logs. We tested this approach with<br>different kind of theoretical reservoirs, with the presence of oil, water and gas in different proportions. This procedure shows fast and accuracy, because it considers better the characteristics of the invasion process.