METHOD OF OPERATING A PAIR OF WELLS PRODUCING HIGH-VISCOSITY OIL Russian patent published in 2019 - IPC E21B43/24 E21B7/04 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil-producing industry. Method for operation of a pair of wells producing high-viscosity oil includes construction with filter parts in appropriate horizontal shafts of production well and injection well located below and parallel to production well, carrying out in a horizontal borehole of a geophysical survey for determining oil saturation along a horizontal borehole, placing two columns of tubing string in a pressure well ROP, wherein end of column ROP smaller diameter is arranged at the beginning of horizontal shaft, and end of column ROP larger diameter in the zone with oil saturation of more than 60 %, controlled steam injection into the injection well through the columns ROP different diameter, and by means of geophysical studies in the horizontal borehole of the production well, a transition zone with a temperature between larger and smaller heating is determined, from which the electric-centrifugal pump is extracted, wherein when the liquid temperature drops below the maximum allowable at the pump inlet, the steam injection through the injection well is increased, and when the temperature at the pump inlet increases, the injection of steam through the injection well is reduced and/or the pump is switched to periodic operation. Before lowering into injection well in column ROP larger diameter is equipped with one or several couplings with one or two holes arranged along the perimeter evenly. During lowering the holes are arranged near the middle of the filter part to create an additional point or several steam pumping points for uniform heating along the entire horizontal borehole of the well and greater coverage of the formation. At that, couplings with 2 holes are used at volume of steam injection of not less than 120 t/day in ROP of larger diameter. At filter part length of less than 500 m one coupling with orifice or 2 holes of approximately 6 mm is lowered. At length of 500–700 m one coupling with hole or 2 holes is lowered approximately 8 mm. At filter part length of more than 700 m, 2 couplings with hole or 2 holes of 8 mm are lowered and distance between said couplings is not less than 100 m. Pump with shank communicated with pump inlet is lowered into production well. Inlet of shank end is located in transition temperature zone, and pump is located beyond filter part of horizontal shaft of production well.

EFFECT: increased stability of pump operation, creation of a steam chamber more stretched along the horizontal borehole, involvement of a larger formation zone, uniform heating of the formation.

1 cl, 1 dwg, 1 ex