METHOD OF APPLICATION OF ELECTRICAL CENTRIFUGAL PUMP WITH MULTIPHASE PUMP AND PACKER Russian patent published in 2017 - IPC E21B43/00 F04B47/00 

FIELD: petroleum industry.

SUBSTANCE: packer or two-packer arrangement is installed in a well below the unpressurized site of the production casing or above the top perforation interval. A section of multiphase pump is installed between an electrical centrifugal pump and an inlet module. A submerged electrical motor with hydroprotection and cooled by the pumped fluid is equipped with the external pressurized enclosure, which is hermetically connected to the inlet module of the electrical centrifugal pump, and performed with the possibility of isolation of the pump from intertubular space and hydraulic communication of it with the hollow of the pipe column with the cut-off packer below the pump. A tailpipe of pumping and compression pipes is connected to the sealed enclosure. The assembled arrangement is descended into the well to the depth of the top packer or two-packer arrangement installation. After that, the hermetic lock-on of the tailpipe with the packer is performed by loading. The well is commissioned to operation with provision of fluid feed from below the packer via the tailpipe; the internal hollow of the sealed enclosure, inlet module, and the multiphase pump, into the electrical centrifugal pump. Additionally, the mechanical impurity filter may be installed under the enclosure. With the help of the multiphase pump, the gas-liquid mixture is homogenized and partially compressed; the operation interval of feeds and the magnitude of the limit concentration of gas in the gas-liquid mixture, as well as the magnitude of the head, are increased; the pressure at the inlet of the electrical centrifugal pump increases to the level providing its stable operation.

EFFECT: increasing of efficiency of formation fluid recovery from wells with an unpressurized operation casing.

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