Marine Technology Reporter Blogs - hydraulic

The definition of MPD recently adopted by the IADC Underbalanced Operations and Managed Pressure Committee states that: “Managed Pressure Drilling (MPD) is an adaptive drilling process used to precisely control the annular pressure profile throughout the wellbore. According to drilling specialists, bottomhole pressure is normally maintained above pore pressure by controlling the density of the drilling fluid. When density gets too high, the formation begins to absorb the fluid and the fluid density needs to be adjusted. Casing must be run to isolate the open hole before drilling can continue. The common objective of all currently known managed pressure drilling techniques is to stretch or eliminate casing points to allow drilling beyond conventional limits of depth or pressure variation.

The pre-salt is still in its infancy, the only thing that´s guaranteed is that a lot of light oil is down there under a massive viscous salt crust over 2km deep in places. We know its recovery is viable and economically feasible (Oil companies don´t play to lose). How much O&G there actually is down there, may be a whole lot more than people are led to believe. Some people do have a reasonable idea of the magnitude of the deepwater pre-salt, mostly they are or one day were, Petrobras geologists, yet no one really knows the full extension of the Brazilian pre-salt reservoirs. It´s massive anyway, it´ll take 5 more years for the picture to become clearer but the deepwater challenges are here, they are many, and time is not on Brazil´s side.