A ‘designer mud’ was introduced in collaboration with M-I Swaco based on low ECDs cesium/potassium formate brine from Sinomine Specialty Fluids with a controlled particle size distribution blend of calcium carbonate and graphite. The density of this mud ranged from 1.79 to 1.83 g/cm3 (14.9 to 15.2 lb/gal).
All wells drilled in MPD mode were completed in overbalance with 1.91 to 2.12 g/cm3 (15.9 to 17.7 lb/gal) cesium/potassium formate completion fluid.
This case history and all others are downloadable here.
Syltøy, S., Eide, S. E., Torvund, S., Berg, P. C., Larsen, T., Fjeldberg, H., Bjørkevoll, K. S., McCaskill, J., Prebensen, O. I. and Low, E. (2008, January 28). Highly Advanced Multitechnical MPD Concept Extends Achievable HPHT Targets in the North Sea. Proc., SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition, Abu Dhabi, UAE. SPE-114484-MS.