Underbalanced drilling requires downhole pressure management

Zhihua Wang, Rolv Rommetveit RF-Rogaland Research Stavanger, Norway Aarnoud Bijleveld Shell Research & Technical Services Rijswijk, The Netherlands Roberto Maglione Agip S.p.A. Milano, Italy Didier Gazaniol Elf Aquitaine S.A. Pau, France Controlling downhole-pressure fluctuations while drilling underbalanced reduces formation damage, avoids lost circulation, and minimizes differential sticking. One of the primary methods used to drill underbalanced is gas injection. It decreases the density of the drilling fluid and creates a condition where the bottom hole pressure (BHP) is less than the formation pressure (Fig. 1 [43004 b...

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