Patent ID: 7789141

Claim:
A method for oil recovery enhancement comprising the steps of: lowering a vibroacoustic downhole emitter into a well down to a production layer depth and performing acoustic impact on the formation by a multiple-frequency signal containing at least two simple harmonic components whose frequencies and amplitudes meet the resonance overlapping condition  1 2 ⁢ c ⁢ ρ ⁢ ω 1 ⁢ P 1 + ω 2 ⁢ P 2 ω 1 - ω 2  > 1 , where P 1 and P 2 —signal amplitudes [Pa], ω 1 and ω 2 —their frequencies [Hz], c—acoustic sound velocity in the formation fluid [m/s], ρ—formation fluid density [g/cm 3 ].