BROENNPRODUKSJONSUTSTYR OG FREMGANGSMAATE TIL ANVENDELSE AV SAMME

A method and apparatus for pumping a well using a jet pump. The method comprises pumping a power fluid downwardly in a first flow path in a well, directing the power fluid along a second flow path through a jet pump back to the surface, introducing produced fluids into the jet pump from below the pump, mixing the produced fluids with the power fluid in the pump, and pumping the fluid mixture to the surface through the second flow path along a substantially straight line from the zone of mixing in the pump. The apparatus includes a jet pump having a housing provided with a central bore closed at a lower end and having a transverse bore opening into the lower end of the central bore for admission of power fluid, a nozzle body and nozzle in the central bore above the transverse bore, a throat and diffuser in the bore above the nozzle, flow passages into the housing from the lower end of the housing around and separate from the transverse bore and an annular entry passage from the bypass flow passages into the housing bore between the nozzle and the throat for admission of produce fluids into the housing bore downstream from the nozzle in response to a low pressure in the throat produced by the nozzle. The nozzle body, nozzle, throat, and diffuser of the jet pump are arranged in tandem along a straight line axis.