SUCKER-ROD PUMP WITH POSSIBILITY OF TREATMENT OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2024 - IPC F04B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for mechanized extraction of both common oil and high-viscosity oil, natural bitumen, as well as in other complicated operating conditions of wells. Sucker-rod pump with the possibility of treatment of the bottom-hole zone of the formation contains a cylinder, a hollow plunger placed in the cavity of the cylinder. Above the main cylinder there is an additional cylinder of a smaller diameter with a hollow plunger of the corresponding diameter movably located in the cavity of the cylinder, the upper end of which is connected to the pump rod by means of a centralizer. To the lower end of the plunger of small diameter with the suction ball valve there is connected a disk valve with a shut-off element in the form of a disk, which is rigidly fixed on a movable centring element with longitudinal recesses. Upper part of the disc valve is made with openings, which connect the inter-cylinder space with the cavity of the plunger of small diameter and the cavity of the pump pipes. Centring element of the disc valve is rigidly connected by a stock to the plunger element, the outer diameter of which is equal to the diameter of the main hollow plunger, and is placed outside the cavity of the main plunger. Lower end of the main cylinder is equipped with an annular stop, the inner diameter of which is less than the outer diameter of the plunger element, and the length of the small-diameter plunger is equal to the length of the pump stroke. Total length of the plunger assembly of the main and additional plungers together with the suction and delivery disc valves in the extreme lower position is such that the upper part of the centraliser remains in the cavity of the cylinder of small diameter.

EFFECT: sucker-rod pump with possibility of treatment of bottomhole formation zone is efficient and reliable due to simplification of its design and reduction of overall dimensions.

1 cl, 4 dwg