METHOD FOR OIL DISPLACEMENT FROM OIL RESERVOIR Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil production, particularly oil reservoir stimulation.

SUBSTANCE: method involves previously determining dynamic viscosity of oil-and-gas mixture under in-situ conditions; simultaneously injecting water and gas in oil reservoir via separate pipelines; mixing water and gas by ejecting thereof inside well bore at a certain depth; displacing oil towards production wells by water-and-gas mixture having dynamic viscosity equal to that of oil-and-gas mixture under in-situ conditions. Water-and-gas mixture is prepared so that mixture proportion provides dynamic viscosity equal to that of oil-and-gas mixture under in-situ conditions. Water is cleaned of mechanical impurities and exposed to magnetic field with 320-400 kA/m strength before water being injected into the well.

EFFECT: increased efficiency of oil displacement from reservoir to productive well by water-and-gas mixture due to increased reservoir coverage and reduced bottomhole formation zone clogging.

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