Casing Drilling Well Barrier / Riserless Deepwater

Casing drilling offers several advantages to dynamically kill gas/oil or water flows:

• A single trip operation minimizing or eliminating surge and swab effects.

• Casing is always near bottom during the drilling operations; being well positioned to facilitate kill operations.

• Has casing-to-hole size ratios suitable for dynamic kill operations.

• Casing drilled holes exhibit less washout due to the smearing effect.

• Higher annular velocities improve hole cleaning.