METHOD OF PUTTING INTO OPERATION OF PRODUCTIVE RESERVOIRS IN WELLS AT THE LATE STAGE OF DEVELOPMENT Russian patent published in 2015 - IPC E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil-extracting industry, to facilities of non-damaging drilling of a productive interval of formation and inducing oil inflow from it. The method of putting into operation of productive formations at a late stage of development contains drilling of productive formations by drilling perforation and creation of differential pressure drawdown. During drilling of formations by a drilling perforator with high drill penetration into rock the drill passing through metal of the casing string, cement stone and rock is monitored by the value of registered load on the driving mechanism of drill extension. The process of increase of load on the driving mechanism of drill extension at its penetration through the colmataged zone deep into the rock by no less than 250-300 mm and the moment of sharp decrease of the named load after passing the colmataged zone of rock after registration of which at once the pressure drop is initiated in the casing string below the hydrostatic level no less than by 0.5 MPa.

EFFECT: increase of level of oil recovery of newly drilled productive formations is provided.

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