Completing underbalanced wells

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Underbalanced drilling (UBD) can create special challenges for well completion. The majority of wells previously drilled underbalanced could not be completed underbalanced - the wells were displaced to an overbalanced condition with kill fluid prior to running the liner or completion. Depending on the completion fluid type, some formation damage would take place. The damage is not as severe for completion brine as with drilling mud because there are no drilled cuttings and fines in the brine. However, reductions in productivity of 20 to 50% have been encountered in underbalanced drilled wells that were killed for the installation of the completion.

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