OPERATING METHOD OF HIGH-VISCOSITY OIL RECOVERY DOWNHOLE Russian patent published in 2017 - IPC E21B43/16 E21B47/08 E21B43/24 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: method includes the downhole assembly, consisting of the bottom upwards from the lower perforated joint, the rod well pump, the tubing string - TS and the rod string. The rod well pump is actuated by the action of the rod string movements, the high-viscosity oil is supplied to the wellhead through the tubing string and the high-viscosity oil is selected through the tubing string with the possibility of direct washing. After actuating the rod well pump and the high-viscosity oil selection start, the initial dynamometer chart is recorded and the initial maximum and minimum loads to the rod string is determined. Continue the high-viscosity oil selection from the downhole through the tubing string by the rod well pump and periodically record the dynamometer charts. If according to the dynamometer chart results the maximum or minimum loads deviation is from 0 to 5% from the initial values, then continue to operate the downhole. If the deviation is from 5 to 30% from the initial values, then stop the rod well pump and perform the downhole backwashing by pumping of hot oil with the special pump unit through the interstring space into the lower perforated joint through the tubing string to the trough until the injection pressure in the interstring space drops in 1.5 times. After that provide the repeated recording of the dynamometer chart. Determine the maximum or minimum loads to the rod string, from the condition of reaching 0 to 5% from the initial values. If the maximum or minimum loads deviation during the dynamometer chart recording is from 30 to 100% from the initial values, then the geophysical tipped logging cable is lowered without interrupting the selection of high-viscosity oil by the rod well pump. Provide the impulse high-frequency thermoacoustic (IHFTA) conditioning of the borehole and bottomhole formation zone. During the IHFTA conditioning process of the borehole and bottomhole formation zone the dynamometer chart is periodically recorded every 4 hours until the maximum and minimum loads on the rod string are restored from 0 to 5% of the initial values. After that without interrupting the high-viscosity oil selection, the downhole treatment is stopped and the tipped logging cable is extracted from the downhole interstring space.

EFFECT: increase of the high-viscosity oil recovery downhole efficiency by reducing the intensity of asphaltene deposits on the downhole inner walls, the water-oil emulsion breaking and increasing of the high-viscosity oil amount selection from the downhole.

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