AUTOMATED FLUSHING METHOD FOR SCREW PUMP SYSTEM Russian patent published in 2021 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the use of screw pumps with automated washing. Method includes initiating by means of flushing cycle controller of automated flushing system, functionally connected to screw pump system, disconnection by screw pump system helical pump operating speed controller, closing by means of the gas flow valve controller to stop the fluid upflow in the annular space of the casing string, by means of the controller, the flushing valve is opened to discharge fluid from the source into the annular space of the casing string. Immediately after accumulation of flushing fluid in annular space, pump speed is increased by controller for beginning of washing of casing string, higher pump speed is maintained until, at least, the pre-set flushing time has elapsed or the design flushing volume is exceeded. Flushing valve is closed by controller to complete washing of casing string and repeatedly opening by means of controller of gas flow valve and resuming control of operating speed of screw pump.

EFFECT: higher efficiency of cleaning due to automated control and process control, reduced time costs.

26 cl, 4 dwg