Author: Marat Seitimov
Underbalanced drilling (UBD) is an important technique for drilling mature fields with pressure-depleted reservoirs, narrow pressure windows and/or drilling issues.
The bottom-hole circulation pressure is a combination of hydrostatic pressure, circulation friction pressure, and surface pressure applied at the choke. When drilling underbalanced, the well is still controlled by maintaining the wellbore pressure, but this pressure is kept to always be below the reservoir pressure.
In underbalanced drilling, the primary well control function of the mud column is replaced by a combination of flow and . . .
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