..., severe fluid losses, high mud costs, formation damage, and post-well production issues. Clear fluid brine systems such as Calcium Chloride (CaCl 2 ) and Calcium Bromide (CaBr 2 ) are usually preferred because of their compatibility with coals and their ability to minimize formation damage. However...

...Introduction Some of the challenging problems of the drilling industry addressed by CBHP variation of MPD (one of the several technologies used to solve these problems) have been – solving kick-loss cycles and surge-swab cycles, drilling through narrow pressure windows, mitigating fluid losses...

... of maintaining the bottomhole pressure between the maximum pore pressure and minimum fracture pressures of the exposed formations. This can lead to wellbore influx, formation damage and fluid loss. Managed pressure drilling (MPD) is an adjustable drilling technique that will help balance and maintain the annulus...

... offshore wells in Campos and Santos Basins located in Brazil offshore. well control upper zone lower completion lower zone SBP Upstream Oil & Gas completion annular pressure drilling fluid loss MPD technique PMCD Scenario upper completion seawater installation injection...

... the duration and costs of the interventions when compared to conventional drilling. Ideally, the rigs equipped with MPD system should only be used in wells, or in specific phases of the well, that requires MPD to conclude or where the NPT associated with fluid losses is considerable. In these scenarios...

... window. Those conditions generate operational issues (influx or fluid losses) and are the primary reason for the use of the Under Balanced Drilling (UBD) technology through problematic zones. When using conventional BHA for UBD operations, after reaching TD, it is necessary to kill the well...

... technique) was planned to drill the 6?? section through the tectonically fractured Sandstone Hamra Quartzite maintaining the ECD within the drilling window limits initially defined by the predicted formation pressure and the average mud hydrostatic with which fluid losses were experienced in the offset...

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... pressure andfracture pressure window. In addition, as operational window between formation and fluid losses pressure could get closed, leading to the boundary where these losses are uncontrollable by mechanical means, the drilling mode could be switched to the Pressurized Mud Cap Drilling (PMCD) technique...

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