Such a configuration would enable circulating at a much higher flow rate than with the reamer alone. To overcome the reaming and cleanout challenges, Schlumberger recommended drilling and underreaming the 6 1/2-in × 8-in hole section with directional tools below a 6375 series Rhino XS reamer, then underreaming a 6 1/2-in rathole to 8 in with a separate cleanout BHA.īecause the 6375 series Rhino XS reamer cannot be deactivated, Schlumberger suggested using a 5-in WELL COMMANDER valve from M-I SWACO, a Schlumberger company, directly above the reamer to bypass flow to the annulus above, effectively keeping the cutter arms collapsed. Perform underreaming and cleanout in one trip However, the 6375 series Rhino XS reamer does not have a deactivation option once the arms are activated, they will open each time the pumps are on, which would damage the casing ID while circulating and hole cleaning with the reamer inside the casing. Because circulation would continue with a Rhino XS reamer inside the casing, a solution was needed to keep the reamer arms closed. In the Chirag field offshore Azerbaijan, BP's underreaming operation called for a 6 1/2-in rathole to be expanded to 8 in, with a separate cleanout BHA to be used for effective hole cleaning at a high flow rate and with mud conditioning prior to a completion run. Achieve effective hole cleaning at high flow rates
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