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12-31-2009, 01:22 PM
why the rop increases with underbalance drilling?

03-01-2010, 08:36 AM
Greetings !

underbalance= FP > ECD > BP : geomechanics stated that due this, we need less pressure (hydraulic and mechanic), less WOB (in comparisson with overbalance conditions in the same environment) to break the rocks. Its a wide subject but this is the main idea...i suggest you to read any paper related to underbalance principles.......anyway, i will check if i have any file to share with u....