DEVELOPMENT OF OIL DEPOSIT BY HEAT AND WATER-GAS IMPACTS IN VERTICAL, HORIZONTAL AND MULTIHOLE WELLS SYSTEM Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling or selection of drilled production and injection wells at oil deposit section. Lateral horizontal shafts or horizontal injection wells are drilled. Water-gas mix consisting of water and associated oil gas is injected via vertical injection wells, hot water is injected via horizontal injection wells or via lateral horizontal shafts and extraction of products via production wells. In compliance with this invention, vertical wells drilling data are used for calculation of optimum injection parameters using the thermal hydrodynamic model. Said horizontal injection wells or lateral horizontal shafts are drilled parallel with multi-face wells or horizontal production wells with spacing between shafts making at least 150 m. Said horizontal injection wells or lateral horizontal shafts are equipped downhole heaters to force hot water with temperature 95°C at well mouth and at injection pressure of (0.45-0.85) P_r, where P_r is vertical rock pressure. In every vertical injection well, injected is water-gas mix at flow rate of Q_g=V_g/N+Q_w, m³/day, where V_g is the volume of extracted associated oil gas per day, m³; N is the number of vertical injection wells; Q_w is flow rate of water injected in vertical injection wells for 100% compensation for extraction for injection, m³/day.

EFFECT: higher reservoir recovery, lower oil viscosity.

2 cl, 2 ex, 1 dwg