f Top Drive Casing Running System Success in Turkey for TPAO on the Black Sea Deep Water Project

Results, Observations, and Conclusions: The Top Drive Casing Running & Drilling system was used on two subsea wells, respectively Yassihouk and Surmene, over a 7 month period for running various casing string sizes: - 18” 128# P110, ran one liner string, length 206 meters - 16” 96# 125HC, ran two liner strings, length 650 meters - 13-5/8” 88.2# 125HC, ran one casing string, length 1560 meters - 9-5/8” 53.5# 125HC, ran one liner string, length 910 meters The Top Drive Casing Make-up Tool combines a power tong including independent torque-turn monitoring, main hoisting elevator, fill-up and circulation tool, single joint handling and a thread weight compensator, The thread weight compensator eliminated any cross threading and damage of threaded connections. None of the casing joints were damaged or laid out, which reduces nonproductive time (NPT) during casing running operations. This system eliminates much of the manual handling of traditional casing running equipment on the rig floor and the need for working on rig floor scaffolds. The system also incorporates link tilt bail arms including remotely operated single joint elevator to align the casing for makeup, eliminating the requirement of having a stabber working in the derrick. The client and drilling contractor classified the system as a “hands-off” system, eliminating activities when using conventional equipment: - Manual pipe stabbing - Power tong positioning and door closing - Pinch points in respect of manual handling As the system is connected to the top drive, the total casing running operation is mainly in control of the driller, enabling an increase in casing running efficiency and consistency compared to conventional running equipment. This reduces the “open” hole time and the potential for differential sticking or cave-in of the well bore. As some of the casing running operations were executed in bad weather conditions (heavy winds / rig motion) the casing running operations could continue as they may have been stopped if conventional equipment would have been be used. The remotely operated system is completely portable and requires no permanent interface into the rig structure.