Multiphase pump with sequential jets

A pumping device employing direct energy exchange between a drive fluid and a primary fluid circulating through a pipe, said pumping device being located within said pipe and comprising, in combination, a static hollow part allowing said drive fluid to pass into said pipe, said static hollow part having at at least one of its ends at least one first orifice, a distributing part having at least two second orifices, said distributing part being situated with respect to the static hollow part such as to allow the drive fluid to pass from the at least one first orifice to at least one second orifice and into the primary fluid, with the distributing part and the static hollow part being joined to each other by a connecting and sealing part, a common meeting space being defined by the distribution part, the connecting and sealing part and the pipe in which the primary fluid circulates wherein the primary fluid and the drive fluid meet, a movable part disposed in a space formed by the static hollow part, the distributing part, and the connecting and sealing part, said movable part having at least one means for blocking at least one of said second orifices such that at least part of said drive fluid is ejected into the primary fluid at said meeting space in the form of liquid pistons when the movable part rotates.