GEAR FOR EXTRACTION OF OIL FROM FLOODED PRODUCTIVE POOL Russian patent published in 2002 - IPC

FIELD: oil and gas industry, specifically, pumping of flooded oil carrying increased quantities of paraffin, resins and asphaltenes. SUBSTANCE: gear includes tubing string, two screw pumps with common shaft, intake chamber placed opposite to oil- bearing interval, packer insulating producing pool, magnetizing units. Magnetizing units are placed in intake chamber into which water-gas-oil mixture goes from producing pool and take into account physical-chemical properties of this mixture and across inlets of screw pumps. Common shaft of pumps is made of magnetic material. Magnetizing units show different magnetic properties and have stepped internal surfaces. They are mounted with expanded part upwards on upper pump and with expanded part downwards on lower pump. EFFECT: increased operational efficiency of oil production, prolonged interval between well cleanups, reduced usage of materials. 2 cl, 1 dwg