METHOD FOR EXTRACTING AN OIL POOL Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil extractive industry, possible use during operation of oil and oil-gas deposits at various extraction stages with estimation of fullness of extraction of oil resources by cells of geological technical model of pool and with optimization of deposit extraction.

SUBSTANCE: method includes extracting oil through product wells, forcing water through force wells, building a geological model, on its basis, selection of zones with oil resources, justifying and realization of technological solutions concerning extraction of selected zones. In accordance to invention on basis of geological model for each hydrodynamic layer of model primary (3H)⁰ and current (3H)^t oil reserves are evaluated and on basis of these potentials of remaining resources are evaluated layer-wise. Hydrodynamic layers are selected with greatest potential of remaining resources, analysis of extraction potential is performed. For evaluation of intensiveness of effect of water-flooding system on cell reserves and for estimating fullness of their extraction three parameters are used. First one - K₁ ^t characterizes degree of washing of cell collectors and represents a ratio between volume of displacing liquid V₁ ^t, filtered through collector of each cell at date of analysis, and original oil reserves of the same cell . Second parameter K₂ ^t _{characterizes alteration of reserves during same extraction period and represents the current value of extraction coefficient - . Third parameter K3 ^t characterizes current extraction of cell reserves in relation to potentially possible displacement coefficient and represents a ratio of achieved and current value of displacement coefficient - Kd ^t, to potentially possible For each one of received parameters scheme of change of values thereof across the area of deposit is built, on basis of which zones are selected based on commonality of values of calculated coefficients. Received schemes are analyzed jointly. On basis of complex analysis of schemes presence and position of weakly drained zones with non-extracted oil reserves are determined. After that extraction of oil deposits in aforementioned zones is promoted.}

EFFECT: increased current oil recovery and extraction due to fuller involvement in the process of oil masses localized in inter-well space.

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