Device for reversing the direction of flow of a fluid at the level of a drill bit

摘要

This device, positioned above the drill bit, comprises a body provided with an axial bore communicating with the drill string and distribution means, controlling the direction of flow of the flushing fluid, slidably mounted in said bore and having two positions. This distribution means can be shifted from a first to a second position and vice-versa by a succession of fluid supply periods separated by periods of interruption of the fluid supply.