HIGH-VISCOSITY OIL WELL DEVELOPMENT METHOD Russian patent published in 2017 - IPC E21B43/16 E21B43/24 E21B43/25 E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention is intended to reduce asphaltene, resin and paraffin sediment (ARPS) for downhole equipment and water oil emulsion breaking in the borehole during high-viscosity oil well operation. The high viscosity oil well development method includes the descent into the well of a tubing string - tubing with a pump and a capillary tube fixed to the outer surface of the tubing tring with taps, simultaneous oil withdrawal and chemical reagent supply with a metering pump from the wellhead via a capillary tube. Screw pump with top drive from the rod string is used as the pump. Oil paraffin solvent is used as the chemical reagent dispensed through the capillary tube. 12 hours before start of the screw pump drive, pulsed high frequency thermoacoustic processing of the bottomhole formation zone is carried out. Before starting the screw pump, by supplying solvent, the metering pump fills the capillary tube with a solvent from the screw pump suction interval to the wellhead, solvent supply into the capillary tube is stopped, maximum current load is set to the screw pump drive, depending on the rated current load of the screw pump drive electric motor. The screw pump drive is started with rotor speed 70 rpm, followed by gradual increase up to 110 rpm. After starting the screw pump drive, solvent is supplied through the capillary tube for the screw pump suction at a rate of 10% of the well flow rate. When the load current rises to 15% of the rated load, rotor speed is reduced to 60 rpm, solvent supply to the capillary tube is stepwisely increased to 20% of the well flow rate. If the load rises above the maximum value, and the pump is disconnected, backwash with hot oil is performed and well development continues with high viscosity oil.

EFFECT: improved reliability of method implementation by ARPS elimination on the downhole equipment, with the pump putting into operation with increased efficiency of the downhole pump.

2 dwg