SIMULATION METHOD OF OIL EXTRACTION FROM OIL WELL Russian patent published in 2013 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: extraction method involves the change of scavenge pump parameters. Opening of the pump inlet valve is performed with a delay as the space above the valve becomes free. A short-term reduced pressure zone is created above the valve, i.e. negative pressure zone. Then, opening of the inlet valve of the pump is performed and a sudden pressure drop is provided in the well from high pressure zone to lower pressure zone. Thus, forced suction due to formation of short-term vacuum and increase in capacity of the formation per cycle is provided per the value equal to the volume of the created vacuum space. Repetition of those actions contributes to creation of wave action on the formation, which provides the increase in its permeability due to removal of loose rocks from the bottom-hole zone of the perforated formation, which results in increase of the bottom-hole zone permeability and cross-section area of channels, via which oil is supplied to the well.

EFFECT: increasing the coefficient of the formation oil recovery owing to providing the removal of loose rocks and release of colmataged passages.