P27 PECULIARITY OF RESERVES PRODUCTION AND OIL RECOVERY OF OIL AND GAS FIELDS Abstract 1 This article considers some questions concerned with oil production efficiency (by the example one of the West Siberia oil and gas field) and demonstrated waterflooding optimization in combination with forced production at saving of structure and increasing of bed stimulation (including side-tracking) is an effective tool of IOR of tangled-build fields and promotes to rise oil recovery factor 6-10 abs. % higher. Introduction High linear dimensions and tangled geological structure characterized most oil and gas fields of OJSC “Surgutneftegas”. For example linear dimensions of Lyantorskoye


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