METHOD TO DEVELOP HIGH-VISCOSITY OIL DEPOSIT Russian patent published in 2010 - IPC E21B43/243 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises injecting oxidiser via injection wells, carrying out fire flooding and extracting oil through output wells. Additionally, fuel mixed with water is injected into injection wells parallel to oxidiser. Output wells represent horizontal holes in the bed bottom part, while injection holes are vertical wells arranged at a certain distance from horizontal hole end and from each other to rule out outburst of fuel or oxidiser into other wells in direction along horizontal well continuation. Fuel is forced parallel with water on mixing it directly prior to injection into bed through vertical wells nearest to horizontal well while oxidiser is injected through remote wells. Fuel injection bottom hole pressure exceeds that of vertical fracture opening and oxidiser injection pressure exceeds that of fuel injection. Note here that amount of water in fuel is increased when temperature of extracted product exceeds preset value and decreased when the former decreases below preset temperature.

EFFECT: higher efficiency of fire flooding thanks to adjustment of fire temperature and creation of steam chamber inside bed, expended performances of low-permeability beds.

2 dwg