METHOD OF OIL DEPOSIT DEVELOPMENT BY THERMAL AND WATER-GAS SIMULATION Russian patent published in 2014 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: in this method of oil deposit development by thermal and water-gas simulation composed of drilling of producers and injectors at the oil deposit area, injecting of water-gas mixture and heat carrier through injectors, extracting of the product through producers, vertical producers and injectors are drilled as per in-line development method, calculation of optimal injection parameters is made as per thermal hydrodynamic model with use of the above wells drilling data. Ratio of the vertical producers and injectors is 2:1. Horizontal injectors are drilled between lines of vertical producers without vertical injectors. Horizontal shafts are placed in parallel to each other with length of (1.4-2.8)·a, where a is the distance between vertical wells. Horizontal injectors are equipped with bottomhole heaters and injection is made to the formations lying at the depth of 700 m and more with hot water at temperature of at least 95°C at the wellhead and under injection pressure of (0.45-0.85)·P_g, where P_g is vertical ground pressure; to the formations lying at the depth less than 700 m water steam is injected with temperature of at least 200°C at the wellhead and steam dryness factor of 0.6-0.8. To each vertical injector water-gas mixture is injected, at that the mixture consists of water and associated gas, with the consumption rate of Q_g=V_g/N+Q_w, m³/day, where V_g is volume of produced associated gas from the zone per day, m³; N is a number of vertical injectors; Q_w is consumption of water injected to vertical injectors ensuring 100% current compensation of extraction by injection in the zone, m³/day.

EFFECT: higher oil formation recovery, reduced oil viscosity and increased coverage ratio for the formation.

2 ex, 1 dwg