DOWNHOLE INSERTION ROD PUMP Russian patent published in 2023 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to plug-in rod pumps operating in wells with a complex, curved bore. The downhole plug-in rod pump comprises outer casing 1, cylinder 2 installed in casing 1 with plunger 3, suction and discharge valves 4 and 5, upper sub 6 and a lower sub, lower filter 7, lock support 8 and upper centralizer 9. Casing 1 has support 8 mounted on top of it. Inside casing 1, additional centralizers 10 are located evenly along the length of cylinder 2. All centralizers 9 and 10 are rigidly mounted inside casing 1 and adapted for sliding outside cylinder 2 and at a distance from each other, which excludes jamming of plunger 3 inside cylinder 2 during the operation of the wellhead drive and the breakaway of cylinder 1 from support 8.

EFFECT: simplified design and improved reliability.

2 cl, 2 dwg