OIL-WELL PUMPING UNIT FOR OIL EXTRACTION AND WATER PUMPING INTO STRATUM Russian patent published in 2009 - IPC E21B43/14 E21B43/40 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to gas-and-oil producing industry, particularly to winning of water-cut oil and utilisation of produced water. Installation includes packer, installed between top and bottom stratums, top and bottom pumps, blown down on tubing string into well and installed higher than packer, pump drives. Inlet of bottom pump is located lower than dynamic head of water precipitated under action of gravitation from water-oil mixture of top stratum, and outlet is communicated to under-packer space. Inlet of top pump is located higher than dynamic head precipitated water, and outlet is communicated to tubing string. Pumps are outfitted by drive, located on surface. Between worm shafts it is inctalled reducer, input shaft of which is connected to bottom of top worm shafts, and outlet - to top of bottom worm shaft of pumps. Reducer body is rigidly fixed to pipe lift string, and its gear ratio is selected so that correlation of efficiency of top and bottom pumps fit correlation of amount of water and oil coming into well with provision condition of gravity separation of water-oil mixture of top layer at opposite rotation of worm shafts.

EFFECT: creation of pumping unit, efficiency increase and design simplification ensured by elimination of additional devices, overlapping pumps inlets, lightening of service and regulation ensured by placement of drive on wellhead, and also fitting simplification of pumps of required efficiency and usage elimination of multidirectional pumps for cost saving.

1 dwg