Process and universal downhole motor for driving a tool

摘要: The process enables, while starting from the same basical members, assembled in two different arrangements, to drive an earth-boring tool such as a bit, milling cutter, core barrel or like with reduced speed fast speed, according prevailing boring conditions. downhole motor comprises shaft and body constituted by helicoidal gears arranged within each other, providing encapsulation preferably of right-handed pitch having K K+1 teeth. For is rotatably mounted connected said body. angularly fixed free undergo nutation movement. resulting relative rotation between shaft. radially fixed. meshes supported order freely rotate around crank system. crank.