METHOD FOR DEVELOPING SUPERVISCOUS OIL DEPOSITS Russian patent published in 2023 - IPC E21B43/24 

FIELD: oil production.

SUBSTANCE: method for the development of deposits of super-viscous oil. The method for developing a super-viscous oil deposit includes the construction of a horizontal production well and an injection well. Two strings of tubing are placed in the injection well, with the end of the string of smaller diameter being placed at the beginning of the horizontal wellbore, and the end of the string of larger diameter in the zone with oil saturation of more than 60%. For steam injection, one or two tubing strings are placed in the production well with the end or ends horizontally offset relative to the ends of the injection well tubing by at least 10 m. Steam is pumped into both wells. The wells are shut for soaking for thermocapillary impregnation. A fiber-optic cable and an electric centrifugal pump, which is lowered on the tubing string, are placed. Selection of products by an electric centrifugal pump is carried out with the removal of a thermogram along the wellbore. When the liquid temperature drops below the maximum allowable at the pump inlet, the steam injection through the injection well 3 is increased, and when the temperature at the pump inlet, the steam injection through the injection well 3 is reduced and/or the pump is switched to a periodic operation mode. After stabilization of the inlet temperature, the pump is transferred to a constant mode of operation. Prior to well construction, a unified geological model of the reservoir is built, the location of horizontal wells within the reservoir is designed, and the volume of initial recoverable reserves per each pair of horizontal wells is determined. After the construction of horizontal wells, the production strings are lowered into the wells with entry into the horizontal parts for a length of at least 50 m and the subsequent descent of the well slotted filters from the end of the production strings to the bottom of the wells. During the well operation, when the temperature at the pump inlet reaches more than 100°C a decrease in the volume of residual recoverable oil reserves of less than 50% of the volume of initial recoverable oil reserves, the pump is removed and the non-perforated horizontal part of the production string of the production well is perforated for at least 50 m. The well slotted filter is moved inside the well towards the surface into the perforated zone and then the pump is lowered into this zone.

EFFECT: increasing the efficiency of development by pumping equipment, to enhance the coverage of the formation by steam exposure, to increase the oil recovery of the deposit.

1 cl, 2 dwg