Description
Casing while Drilling (drilling with casing or liner) is an enabling method that is believed to increase stability and fracture gradient in narrow pore-fracture pressure sedimentary basins and deep offshore applications (plastering effect). Although successful field applications of increasing wellbore integrity have been reported, uncertainties remain regarding the mechanisms and how to operationally capture the maximum attainable wellbore pressure. These uncertainties include the hydraulic complexities of fluids, role of Particle Size Distribution (PSD) and how it relates to the plastering effect, type of drilling fluids, borehole shape, role of lost circulation materials (LCM), variation of drilling parameters, and casing eccentricity. This presentation provides a proactive plastering effect design solution to decrease the interference of several unknowns.