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

FIELD: oil and gas industry.

SUBSTANCE: in development method of a high-viscosity oil or bitumen deposit with horizontal wells, which involves drilling of parallel production wells and double-head horizontal wells located above them with arrangement in plan view between production wells, reinforcement of wells with casing strings with secondary drilling of the formation in production wells, pumping of steam or steam-gas mixture to double-head wells and extraction of the product from production wells, in double-head wells there arranged are non-perforated casing strings; at that, double-head wells are connected in series to each other by means of heat-insulated pipelines so that they form a single heating element. Steam or steam-gas mixture is pumped in series through all double-head wells without being released from the casing string to the formation. At that, continuous measurement of temperature of steam or steam-gas mixture is performed at the outlet and the outlet of each double-head horizontal well. When steam or steam-gas mixture temperature is decreased by more than 5-7% of the initial one in rupture of the single heating element there installed is an additional pumping heating station to maintain the temperature and pressure of pumped steam of steam-gas mixture.

EFFECT: increasing high-viscosity oil or bitumen extraction efficiency owing to stable and continuous thermal action on the productive formation, and owing to excluding produced water and condensate in the volume of extracted product; improving environmental situation owing to excluding the possibility of steam penetration via the formation to the surface; reducing material and technical costs.

2 cl, 3 dwg