PROCEDURE FOR DEVELOPMENT OF HYDROCARBON DEPOSIT Russian patent published in 2013 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: according to the procedure when formation pressure drops till the initial value or less gas in gaseous phase is pumped into lost circulation horizon through injection wells under pressure exceeding formation pressure 1.2-2.0 times ensuring miscible displacement mode till oil flow rates are stabilised in producing wells. Thereafter when formation pressure drops till the initial value liquefied gas is pumped into lost circulation horizon through injection wells under pressure ensuring maximum permissible radius for piston-like displacement of formation fluid till phase-transition point of the pumped liquefied gas to gaseous phase defined by thermobaric formation conditions with further transit to miscible displacement mode. Gas in gaseous phase and liquefied gas is made in cyclic mode. At that pressure of pumped liquefied gas exceeds formation pressure 2-2.5 times.

EFFECT: improvement in development efficiency of oil deposits difficult to recover correlated with low permeable terrigenous container rocks with high content of clay fractions to which water pumping is not feasible.

2 cl, 1 ex, 1 dwg