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Overview of CMCDrnCMCD here refers to the one of Manage Pressure Drilling (MPD). Application of CMCD in deepwater is closely related with the development of marine riser and subsea BOE LRRS includes high pressure marine riser,split BOP and mud-lift pump. CMCD can achieve the control of bottom hole pressure efficiently through LRRS.CMCD. with LRRS has some distinguished advantages in deepwater drilling such as reduction of platform load,precise control of bottom hole pressure and simplification of casing program, etc.