DRIVE OF OIL-WELL SUCKER-ROD PUMP (VERSIONS) Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention is designed for use in drives of oil-well sucker-rod pumps. According to design versions No. I and No. 2, drives have hydraulic cylinders with fitted in floats providing building of buoyant force balancing main part of mass of rod string and float. Oil is lifted by application of additional force to float at change of level of working liquid in hydraulic cylinder owing to its delivery from pneumohydraulic accumulator or supply of compressed air from fan into gas space of hydraulic cylinder. According to design version No. 3, string of rods is displaced owing to connection of oil seal rod and flexible tie from counterweight to bell found in pneumatic cylinder. Displacement of string of rods is provided owing to delivery of compressed air from fan into inner space of bell. Of said drive is furnished with additional system of flexible ties and chain drive and with pumping out device, two wells (designed version No. 4) can be serviced by one drive of well pump simultaneously. EFFECT: reduced materials usage, labour input in manufacture and operation, improved performance characteristics. 4 cl, 4 dwg