METHOD OF HIGH-VISCOSITY MASSIVE OIL POOL DEVELOPMENT Russian patent published in 2015 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity massive oil pool development includes identifying separate production zones with similar oil-filled thickness in the pool cut, drilling of the pool as per any known scheme of injectors and producers with as dense grid as possible. At that productive formations of the lower production zone are penetrated in all drilled wells, oil is extracted from the lower production zone in natural mode from all wells and formation pressure is monitored at all production zones. When formation pressure in the upper production zone comes close to saturation pressure, in the well grid injectors and producers are identified to form the first and second orbits in regard to injectors, then the lower zone is isolated in injectors and producers and productive formations of the upper production zone are penetrated. Working agent in the form of steam is injected through injectors to the upper production zone and oil is extracted from producers of the first orbit in the lower zone and from producers of the second orbit in the upper production zone. Temperature of extracted oil is monitored. When temperature of extracted oil comes close in the producer to maximum permitted value, for the purpose of operation of downhole pumping equipment the operating interval is isolated in the well and penetration is performed of productive formations not included into development before; an then at increase in current steam and oil ratio above the profitable value steam injection to injectors is stopped and working fluid in the form of cold water is injected into them until limit water cut of extracted oil is reached.

EFFECT: increased efficiency of oil pool efficiency development due to regulated oil extraction process in the pool cut considering changes in parameters of formations and oil in the pool.

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