DEVELOPMENT METHOD OF ULTRAVISCOUS OIL DEPOSIT Russian patent published in 2013 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: development method of ultraviscous oil deposit involves construction of horizontal production and injection wells, as well as vertical observation wells, pumping of heat carrier through injection wells with heating of productive formation and creation of steam chamber, extraction of products due to steam gravitational drainage through production wells and monitoring of the steam chamber state. Development of ultraviscous oil deposit is performed with control of actual size of steam chamber by changing the volumes of heat carrier pumping and liquid withdrawal; at that, actual volume of steam chamber is determined by gas surveying on the surface in the zone of supposed steam chamber. If the spread area of steam chamber in productive formation is smaller than the distance between vapours of production and injection wells, vapour pumping volume is increased, and if it is larger, then additional vertical production wells are built for the product withdrawal volume; at that, superheated vapour mixed with fuel combustion products is used as heat carrier.

EFFECT: increasing efficiency of ultraviscous oil deposit development due to improvement of determination accuracy of actual size of steam chamber and its spatial position; reduction of financial and material costs at monitoring of steam chamber state.