METHOD OF PRODUCTION WELLS RECOVERY RATE INCREASE AT LATE STAGES OF OIL FIELD PRODUCTION Russian patent published in 2010 - IPC E21B43/20 E21B43/26 

FIELD: oil-and-gas industry.

SUBSTANCE: in a method of production wells recovery increase at the late stages of the oil field production, including cyclical injection of displacement agents into injection wells and reservoir fluid withdrawal through production wells, those productive intervals treatment using consequent transfer of a elastic energy impulses into the reservoir. Preliminary execute estimation of residual product distribution density, draw maps of residual product distribution density by zones and injection wells selection, which satisfy maximum zonal residual product distribution condition and estimate rock monolithic grade, for example with a cross hole wave method - seismic tomography. Then generate elastic energy impulses transfer to the reservoir in sport wells, till a positive reaction appears in production wells, for instance - recovery rate increase. At the same time execute secondary crack formation evaluation accosting to seismic tomography data. The repeat the estimation of residual product distribution density, draw maps of residual product distribution density by zones and select the next injection wells, satisfying maximum zonal residual product distribution condition and estimate rock monolithic grade near them. Execute cyclical injection of displacement agents into injection wells and reservoir fluid withdrawal through production wells, controlling the fluid withdrawal process with the following elastic energy impulses reservoir treatment in spot wells. At that spot wells selected in places and along a contour, covering flexure, peliclinar zones, and other instant gradient drop production reservoir zones.

EFFECT: method of production reservoir treatment simplification and its efficiency increase.

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