FIELD: mining.
SUBSTANCE: invention relates to mining, in particular to oil industry, and can be used for pumping liquid into upper oil-bearing formation from lower formation of well, especially with high content of associated gas. Pumping-ejector plant for downhole transfer of liquid from lower to upper formation comprises downhole electrically driven centrifugal pump (EDCP) with power cable from control station, which are lowered to casing string on tubing string. Extracted liquid-jet ejector made with through sections of nozzle and mixing chamber, directly proportional to flow rate of lower formation. Lower pulse-mechanical packer separating formations in casing string of well. Upper packer with pressing hydraulic anchor with thrust against lower packer. Ejector inlet nozzle is connected to outlet EDCP branch pipe, and diffuser – with bottom packer barrel and installed channels supplying associated gas at level of upper boundary of under-packer cavity. Upper packer is installed above the upper formation of the well and forms an inter-packer cavity communicating with the upper formation with the lower packer. A filter is mounted in the tubing string at the level of the upper bed, above which a plug is installed in the tubing string excluding release of formation fluid to the surface of the well.
EFFECT: improving operating reliability of centrifugal pump of the plant at downhole transfer of liquid into upper formation from lower formation, especially with high content of associated gas.
6 cl, 1 dwg
