DOUBLE-PACKER INSTALLATION FOR OPERATION OF WELL WITH ELECTRICALLY DRIVEN PUMP, SIMULTANEOUS ISOLATION OF UNTIGHT INTERVAL AND CIRCULATION VALVE Russian patent published in 2014 - IPC E21B34/10 F04D13/10 E21B33/124 

FIELD: oil and gas industry.

SUBSTANCE: double-packer pump unit includes a pipe string of a lesser diameter placed concentrically or eccentrically in a pipe string of a larger diameter. The pipe string of the larger diameter is equipped with the lower and upper packers with a cable input mounted over an electrically driven pump and a return valve. Below the lower packer and over the upper packer the lower criss-cross flow coupling, the lower drain valve and the upper criss-cross flow coupling, the upper drain valve are installed respectively. A control cable, for example, a fibreglass cable, may be laid along the whole equipment and through the packers. A circulation valve and a balancing valve are installed between the lower and upper packers. Above the drain valve the double-packer pump unit is equipped with a disconnector with a hydraulic anchor mounted above it.

EFFECT: improved operational efficiency of the unit and increased reliability of the circulation valve.

4 cl, 4 dwg