METHOD FOR LIQUID DISPLACEMENT FROM FORMATION Russian patent published in 2013 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling at least of one well with its intersecting the formation layers and alternating series cyclic loading to the formation through the well of portions of foaming solution of surface active substance and gas. According to the invention, total volume of foaming solution of surface active substance is determined based on penetration of foaming solution of surface active substance to more low-permeable layer through the distance corresponding to ten radii of the well. Number of portions of gas and foaming solution of surface active substance corresponds to the number of formation layers, and number of pumped gas under formation conditions in each portion exceeds by four times the volume of portion of foaming solution of surface active substance. When cyclic pumping process of portions of foaming solution of surface active substance and gas is completed, continuous gas pumping to the well is continued.

EFFECT: increasing the efficiency of the method owing to providing the possibility of liquid displacement with gas with more complete involvement in the displacement process of low-permeable formation layers.

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