METHOD FOR MECHANISED PUMP OPERATION OF WELLS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC E21B43/00 E21B33/03 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, underground well repairs are performed. For this purpose, a submersible pump set is lowered into the well and lifted from it in a umbilical cable. The submersible pump set is started and put in operation. The bottomhole pressure is reduced. The influx of liquid and gas is induced from formation, separation of gas from liquid and liquid supply to submersible pump is performed, liquid is injected onto surface or into underlying formation, and gas is directed to surface via annular space. In this case, a pressurised lubricator located on the wellhead equipmnet and required for placing the submersible pump set therein is necessary only during tripping operations, but not for the entire service life. A device for mechanised pump operation of wells without killing contains a submersible pump set lowered in a well in a umbilical cable, a wellhead with a preventor, a sealer, a conveyor, a control station. A portion of the umbilical cable with a shut-off device with electrical connectors is connected to an outlet from the submersible pump set. In this case, the length of the umbilical cable portion is greater than the total height of the preventer and the sealer. The outer surface of the shut-off device with electrical connectors is cylindrical. The cylindrical surface diameter of the shut-off device with electrical connectors is 0.95-1.00 of the umbilical cable diameter. The upper end of the umbilical cable is equipped with a shut-off device with electrical connectors. The length of the lubricator is greater than the total length of the submersible pump set, the length of the umbilical cable and the shut-off device with electrical connectors.

EFFECT: increased effectiveness and prolonged service life of the well due to minimisation of restoration terms of formation process characteristics.

6 cl, 5 dwg