OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2014 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of pairs of horizontal wells in superviscous oil deposit in order to perform steam assisted gravity drainage and drilling of viscous or high-viscous oil deposits located downstream in the structure plan, drilling of horizontal producers, steam injection to injectors for steam assisted gravity drainage and injection of hot water to the injectors at viscous or high-viscous oil deposits, product extraction from the producers, separation of oil and water at the well head and reuse of this water. After oil and water separation at the well head, hot water collected from the horizontal producers at superviscous oil deposits is injected through the injectors at viscous or high-viscous oil deposits, at that the horizontal borehole of each injector is placed between the horizontal boreholes of two producers, the distance between the wellhead of superviscous oil producer and the injector at viscous or high-viscous oil deposits and intermediate equipment is selected on the condition that any temperature loss of the injected water is not more than 10°C in any climatic conditions in this region and water separated from oil and collected at the settler at viscous or high-viscous oil deposits is delivered to the steam generator where water is treated from impurities, steam is generated and dryness factor of 0.6-0.8 is ensured; thereafter it is injected through the horizontal injectors to the superviscous oil deposit thus forming the continuous cycle of water circulation for development of two facilities using heat; at that in order to ensure required levels of extraction by injection, regulation of volume of injected water from the settler is performed where oil is separated from water after extraction of oil from viscous or high-viscous oil deposits.

EFFECT: improving oil recovery, percent of recovery from the reservoir and saving of operational costs.

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