The versatility of closed-loop drilling methodologies is providing a wide scope for successfully meeting a varying range of operational and economic objectives. Closed-loop circulating systems are a platform for deploying a broad scope of fit-for-purpose solutions in any drilling environment. Just the addition of a rotating control device (RCD) enhances personnel safety and reduces asset risk. An RCD in place atop the surface BOP or as an integral part of a riser system enables pressure and flow monitoring within the closed-loop circulating system. The highly sensitive kick-loss detection achieved with a closed-loop system provides a unique and almost immediate window for detecting very small pressure changes due to downhole losses or influxes. The next step in scalability is managed pressure drilling (MPD), which is achieved by manipulating surface backpressure via an annular automated choke manifold. Changing choke settings results in a rapid modification of equivalent circulating density (ECD) throughout the well-bore without the cost and effort of changing mud weight. This control, either manual or automated, opens a toolbox of methodologies for proactively managing wellbore and riser pressures ahead of conventional BOP and mud responses.
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