Drillstring sub cuts torque and casing wear

David William Rodman Security DBS Aberdeen George Swietlik Pilot Drilling Control Lowestoft, England A new downhole tool, the drillstring torque-reducing sub, minimizes torque losses and reduces casing wear in extended reach drilling. This drillstring sub effectively reduced torque losses and helped improve torque transfer to the bit on some of the extended reach wells drilled on BP Exploration's Miller development in the U.K. North Sea. Problems with excessive torque during drilling of the Miller field template wells led to a concurrent engineering design and testing program to develop a tool to minimize torque losses. When available technology was judged inadequate to ...

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