METHOD FOR PUMPING A GAS-LIQUID MIXTURE AND MULTIPHASE STAGE FOR IMPLEMENTATION THEREOF Russian patent published in 2023 - IPC F04D29/22 F04D31/00 

FIELD: mechanical engineering.

SUBSTANCE: group of inventions relates to petroleum engineering and can be used for pumping formation fluid with a high gas content from boreholes. Method for pumping a gas-liquid mixture by a multiphase stage of a multistage centrifugal pump, said stage containing a guide apparatus consisting of a body made in the form of a sleeve with a collar, a disk, blades installed between them, an impeller containing a driving disk and a driven disk with blades made in the form of a multilinear grid; a separation chamber is formed in the area between the exit from the impeller and the entrance into the subsequent guide apparatus, a circulation chamber is formed between the exit from the impeller and the entrance into the same impeller. The gas-liquid mixture is dispersed along the entire length of the flow part due to the small length of the blades, the through holes made therein, the protrusions and (or) recesses made on the surface of the disk of the guide apparatus coupled with the partially open blades on the side of the driving disk of the impeller; the maximum gain of the pressure head of the impeller in the flow section in the meridional direction does not exceed the critical pressure head gain value. Multiphase stage of a multistage centrifugal pump, containing a guide apparatus consisting of a body made in the form of a sleeve with a collar, a disk, blades installed between them, an impeller containing a driving disk and a driven disk with blades made in the form of a multilinear grid; a slot radial gap and an axial gap are formed between the driven disk of the impeller and the body. The external diameter of the driving disk of the impeller is not greater than sixty percent of the external diameter of the driven disk; the value of the axial gap between the impeller blades and the disk of the guide apparatus adjacent therewith is not greater than fifteen percent of the height of the blades at the corresponding radius; and the maximum gain of the pressure head of the impeller in the flow section in the meridional direction does not exceed the critical pressure head gain value.

EFFECT: higher reliability, effectiveness of operation of multiphase stages of the centrifugal pump.

9 cl, 4 dwg