... focused on minimising ECD, through optimal casing design, BHA design and mud and cement design. Hydraulic simulations were run with mud hydrostatically at balance with the pore pressure, using applied surface back pressure from MPD to keep bottom hole pressure constant and equalt to the ECD pressure...

... pressure by adjusting the drill string pump rate or changing mud weight to the desired number as required to keep the well overbalance. On the other hand, by having the capability to manipulate the surface back pressure, MPD allows faster adjustment to deal with observed pressure changes...

... hole pressure by adjusting the surface back pressure accordingly. Although the fluid weight in the well is static-underbalanced, the bottom hole pressure is managed to be overbalance at all time. Lower completion string is run to bottom then its hanger and packer set subsequently to have the primary...