ROD SUB-SURFACE PUMP WITH SIDE APERTURE IN CYLINDER PLUGGED WITH HYDRAULIC OVERFLOW VALVE Russian patent published in 2009 - IPC F04B47/00 

FIELD: oil and gas industry.

SUBSTANCE: pump consists of cylinder with side aperture, of elongating sleeves, of suction valve with valve pair, of plunger of assembled structure with connected thereto unit of pressurising valve. The cylinder of the rod pump is equipped with a device leak proof closing the aperture in the point of aperture location. The device consists of two half-rings connected with screws; an aperture of alternate cross section is made in one of the half-rings; this aperture is co-axial to the side aperture in the cylinder body. It has the interior thread in the portion of bigger section and is plugged with a disrupted element in form of a membrane fixed in the aperture with a nut. The latter has an exterior thread. When there is necessity to drain water off from the pump-compressor pipe column, the disruptive element is destructed by means of high pressure in the cavity of pump cylinder.

EFFECT: preventing flow of liquid via overflow aperture during operation of rod sub-surface pump in well, which allows increasing delivery rate of rod sub-surface pump.

4 dwg