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

FIELD: oil industry, possible use for extracting oil deposit, characterized by proximity of bed pressure to pressure of oil saturation with gas in ceiling section and substantial difference between these characteristics in contour-adjacent section of deposit.

SUBSTANCE: in accordance to method, working agent is fed through force wells, oil is extracted through product wells and operation of product wells is maintained in modes with face pressure not lower than 0,75 of pressure value of oil saturation with gas. Dependencies between saturation value and depth, and formation value and depth are built and rules are determined concerning changes of saturation pressure and formation pressure along absolute depth of formation. Wells are positioned in circular or rectilinear rows in plane, repeating iso-lines characterizing rules of change of saturation pressure in deposit. Face pressures in product wells are set at level not less than 75% of actual saturation pressure, taking place in deposit at absolute mark of product wells face. Extraction of ceiling-adjacent section is performed with more intensive forcing of working agent into force wells.

EFFECT: increased current extraction and better oil extraction due to optimized modes of operation of product and force wells due to adaptation to properties of deposit, determining its extractive capabilities.

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