Ball-activated drilling circulating valve
Place lost circulation and wellbore strengthening materials with an alternate circulation path.
12 1/4 in
4,706 ft [1,435 m]
Hard interbedded carbonates
Rumaila Operating Organization (ROO) planned a directional well across the Rus and Hartha Formations in Iraq. These highly interbedded and hard carbonate formations historically induce severe vibrations, causing bit damage and requiring from two to five bits to drill the 12 1/4-in section.