In deep water, one of the hazards that closed-loop drilling systems help mitigate is the threat of riser gas. Closed-loop drilling (CLD) systems allow drilling operations to be performed in a closed environment instead of the conventional method of keeping drilling fluid returns open to the atmosphere. The ability to close or restrict the flow of circulation returns and control and maintain pressure on the well while simultaneously rotating and continuing to drill is only possible with a rotating control device (RCD). An RCD creates a pressure-tight barrier in the wellbore annulus that allows fluid returns to be contained and diverted, forming a vital line of defense against drilling hazards. In a deepwater drilling environment, one of the hazards that CLD systems help mitigate is the threat of riser gas.
展开▼
