A rotary drill bit having one or more fluid nozzles is provided. Each nozzle may include interior surfaces designed to optimize hydraulic performance and efficiency of fluid flowing through the nozzle. The interior surfaces cooperate with each other to minimize turbulent fluid flow through the respective...http://www.google.com/patents/US7802640?utm_source=gb-gplus-sharePatent US7802640 - Rotary drill bit with nozzles designed to enhance hydraulic performance and drilling fluid efficiency
