OIL-WELL SUCKER-ROD PUMP Russian patent published in 2008 - IPC F04B47/02 

FIELD: oil producing industry.

SUBSTANCE: invention is designed for producing high viscosity oils. Proposed sucker-rod pump has fixed cylinder, movable cylinder and fixed plunger. Fixed cylinder is connected with tubing string. Delivery valve is installed in upper part of movable cylinder. Housing of delivery valve is connected with rod on which centralizer and automatic coupler are mounted to connect rod with tubing string. Fixed hollow plunger is arranged inside movable cylinder. Said plunger is connected in lower part with hollow intake branch pipe whose inner diameter is equal to inner diameter of plunger, and outer diameter is smaller than outer diameter of plunger. Intake hollow branch pipe and fixed cylinder are interconnected in lower part by means of discharge valve housing, thus forming ring discharge chamber. Discharge valve periodically communicates discharge chamber with annulus. Suction valve is installed in upper part of hollow plunger, being arranged coaxially with delivery valve.

EFFECT: provision of effective operation of pump owing to increased capacity and enlarged range of use.

2 dwg