DEVELOPMENT METHOD OF HIGH-VISCOSITY OIL DEPOSIT Russian patent published in 2013 - IPC E21B43/24 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: development method of a high-viscosity oil deposit involves drilling of a deposit with vertical production and injection wells, pumping of heat carrier through an injection well and cyclically through production wells, extraction of products through production wells after heat carrier pumping is stopped and exposure is completed, and conversion of the next production well for heat carrier pumping. Drilling of the deposit and pumping of heat carrier is performed to an oil-bearing formation, and priority of conversion of production wells for pumping of heat carrier is determined as per the least oil productivity and bottom-hole temperature. At the first stage, drainage of bottom-hole zones is performed, which consists in alternating operations of heat carrier (steam) pumping, exposure and extraction of the product. At the second stage, heat carrier (hot water) is pumped to injection wells at the temperature of 60-100°C and from time to time a solvent is pumped in the amount of 0.1-1% of the volume of pumped hot water with surface active substance in the amount of 0.1-2% of the solvent volume; hot water is pumped to production wells in the first cycle in the volume equal to the volume of extracted liquid after the last steam heat treatment, and volumes of the following pumping operations are equal to volumes of extracted liquid in the previous cycles; before hot water is injected to production wells, a solvent bank with surface active substance in the amount of 0.1-2% of the solvent volume is pumped in each cycle; volume of solvent bank is calculated. Liquid fraction of pyrolysis of automobile tyres is used as a solvent.

EFFECT: improving recoverable oil coefficient and oil extraction rates owing to increasing the formation coverage by action and increasing oil extraction coefficient.

2 cl, 2 tbl, 1 dwg