DEVELOPMENT METHOD FOR OIL DEPOSIT AREA 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 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. At viscous or high-viscous oil deposits vertical and horizontal producers and vertical and/or directional wells are drilled as outpost wells or as centres of five-, seven- or nine-point elements with producers around, at that part of them may be unavailable. Upon oil separation at the mouth hot water extracted from horizontal producers at high-viscous oil deposits is injected through vertical and/or directional injectors to viscous or high-viscous oil deposits. The distance between the mouth of high-viscous oil producer and viscous or high-viscous oil injector as well as intermediate equipment is assigned provided that temperature loss of transferred water is not more than 10°C for any climatic conditions in this region. Water extracted and separated from oil at water sump at viscous or high-viscous oil deposit is delivered to the steam generating plant, where steam is generated from this water, impurities are separated and dryness factor of 0.6-0.8 is achieved and then water is injected through horizontal injectors to the high-viscous oil deposit, thus forming a continuous water circulation cycle for development of two facilities using heat. At that in order to ensure required compensation levels of extraction by injection the volume of injected water is regulated from the sump where oil is separated from water upon product lifting from the viscous or high-viscous oil deposit.

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

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