Mitigate shallow hazards
Casing Drilling’s smearing effect & narrow annulus
higher circulating friction increases bottom hole pressure
strengthens wellbore with plastering drilling cuttings into formation
allows casing depths to be based upon prevailing pore pressure & fracture gradients
Conventional vs Casing Drilling Geometries
Deepen structural casing
rapid growth of shallow fracture gradient allows deeper casing shoe for higher formation strength (Allows higher mud densities to mitigate hazards)
less casing strings in riserless section allow larger casing strings deeper in well design
mitigate loss-kick cycle
reduces use of contingency casing strings
Prevailing Pores Pressure & Fracture Gradient determines casing design to optimize casing design
Larger drilling operating windows in lower well sections
decreases circulating friction (minimizes fluid loss - kick cycle)
creates opportunity for contingency casing strings
Larger hole section across objectives
Larger completion
Increase production rates, improved economics
Reduction in total well time
less hole sections / casing strings
single trip to drill hole section & run casing
Allows setting high pressure conductor deeper
Allows larger tubing string, less back pressure, higher production
Value in the riserless sections sets up increased value in lower sections