PUMP FOR PUMPING FORMATION FLUID FROM INTER-PACKER SPACE OF WELL Russian patent published in 2025 - IPC F04B9/04 F04B47/06 E21B47/00 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used for pumping formation fluid in instruments used to determine quality of composition of formation fluid. Pump for pumping formation fluid from inter-packer space 25 comprises housing 1, in which there is cam 2 with possibility of rotation in housing 1 and having a longitudinal axis of rotation, bearings 3, a group of differential pistons 6, 24, hydraulic channels, inlet and outlet valves 9 and 11, springs 10, 12. Under the group of pistons 6, 24 there is cam 2 having the shape of a multistage cylinder, which is hollow in the upper and lower parts, with working projections on the outer surface of its housing. Cam 2 rests on thrust washer 4 through thrust bearing 3. Upper end of cam 2 is skewed by a value which determines the value of the stroke of the group of pistons 6, 24. On annular surface 19 of upper end of cam 2 resting rollers 7, 26 located in different supports 8, in each of which with smaller diameter rests one of pistons 6, 24. Annular surface 19 of the upper end of cam 2 is inclined to the perpendicular to the axis of rotation of cam 2 at an angle excluding mashing at the contact of cam 2 with roller 7, 26 during rotation. Above upper ends of pistons 6, 24 there are inflow chambers 20 isolated from each other, which are connected to inlet and outlet valves 9 and 11, which in turn are pressed by springs 10, 12. Chambers 20 are connected to space 25 and closed space and through inflow channel 23, and channel 18 for discharge of pumped liquid. In channel 23 there is pressure sensor 14 and moisture meter 15. Under the annular surface of pistons 6, 24 there is common cavity 21 filled with hydraulic fluid and connected to support channel 22 of annular area of differential pistons 6, 24, which is connected to channel 18 through separating piston 13.

EFFECT: invention is aimed at obtaining pure formation fluid.

9 cl, 10 dwg