FIELD: oil industry.
SUBSTANCE: invention relates to the oil industry, namely to oil production using electrical submersible pumps (ESP unit) for oil production from wells in conditions of high gas factor. Electric centrifugal pump unit includes an electric motor with hydraulic protection and an inlet module arranged inside the casing, pump sections, a tubing string with whipped and check valves, a cable. Lower part of the casing is connected in series to the bypass valve and the inner pipe connected to the adapter coupling, at the same time adapter coupling is made with radial holes and with two internal threaded outputs, in which upper and lower external pipes are installed, upper outer pipe faces the wellhead with its open part, and the lower one is plugged. Thus, the proposed unit increases reliability of ESP unit operation at oil production in conditions of high gas factor due to gas separation before liquid enters the ESP and increase of flow rate of formation fluid washing over the electric motor.
EFFECT: increased reliability of ESP unit operation at oil production in conditions of high gas factor due to gas separation before liquid supply to ESP and increase of flow rate of formation fluid washing with electric motor.
1 cl, 2 dwg
