OIL WELL PUMPING UNIT FOR EXTRACTION AND PUMPING IN OF WATER INTO STRATUM Russian patent published in 2009 - IPC E21B43/14 E21B43/38 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to gas-and-oil producing industry, particularly to extraction of watered oil and utilisation of produced water. Unit contains packer installed between top and bottom stratums, top and bottom multidirectional screw pumps, downed on production tubing into well and installed lower than packer and installed higher than packer, pumps drive, located on surface. Inlet of bottom pump is located lower than dynamic head of exuded under pressure action water from water-oil mixture of top stratum, and output is communicated to under-packer space. Additionally input of top pump is located higher than dynamic head of exuded water, and output is communicated to production tubing for lifting of watered oil on surface of well. Worm shaft of top pump and worm shaft of bottom pump, twisted to side opposite, are connected by rod, and casings of top and bottom pumps- by coupling bushing. Rod and coupling bushing are implemented with ability of regulation of length and fixation for achievement of required distance between inputs of pumps. Correlation of productivities of top and bottom pumps is selected depending on amount of received water into well with condition of providing of specific gravity separation of water-oil mixture of top stratum, in order to eliminate water catch by top pump and of oil - by bottom pump. Total capacity of pumps is selected so that it provides dynamic head of exuded water lower than top stratum, that eliminates formation of "aquatic wedge" on the opposite side to top productive stratum, providing increasing of operation life for oil extraction.

EFFECT: effectiveness increase and design simplification of the device.

4 cl, 1 dwg