METHOD FOR EXTRACTION OF HIGHLY VISCOUS OIL Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of system of product and force wells, opening of product wells by perforation, treatment of bed with acoustical pressure oscillations, generating acoustic well devices lowered into force wells and continuous extraction of oil from product wells. Pipes of force wells are not opened by perforation and are filled with working liquid. Treatment by acoustic oscillations of pressure is performed at two frequencies, main f₁ and additional f₂. Treatment is started at frequency f₁, which is selected based on condition for creation of pressure amplitude providing for pressure gradient for oil influx to product well and oil raising. Values of temperature T₀ and viscosity μ₀ are measured during the process, and frequency f₂ is selected 2-8 times higher than frequency f₁. During the process also measured is maximal increase of oil temperature and minimal value of its viscosity relatively to measured values T₀ and μ₀ respectively. With extraction of bed well device is moved downwards.

EFFECT: higher effectiveness of viscous oil extraction by lowering costs, higher debit and oil yield.

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