ORGANIZATION OF SPECIAL CONDITIONS IN CIRCUMSTANCE OF WATER FLOOD ON A FINAL STAGE OIL FIELD DEVELOPMENT

摘要

Experience data based on oil field development with formation pressure maintenance and low value of oil recovery index is analyzed. The problem of economically irrational oil recovery is introduced, while using a traditional approach in oil field development. Hypothesis of regeneration and reforming of oil reservoir on a final stage is presented. Main recommendations are offered, which directed on profitability of oil recovery in a final stage. New approaches are formalized for development of exhausted oil reservoir, which consisted five stages for conversion development system into different operating regime.First stage – decreasing of energy load in oil reservoir. For this case it is necessary to decrease volume of highly watered well production, by cutting of liquid rate on highly watered wells. Simultaneously it is necessary to decrease water injection rate, in order to save current compensation about 100%.Second stage – it must be carried out special oilfield researches on a downtime wells, which located in microanticlines, correlated with mean layer thickness. The aim of these researches is establishing of oil accumulation facts in well bore and speed of accumulation. Henceforth these wells are transferred into operational mode, in which oil rate wouldn’t exceed inflow rate. Hence it will be provide waterless operation modeThird stage – decreasing of watercut on operation wells, carried out after first stage. It is provided to adopt the technology of water inflow limitation in well with the help of “tail pipe”.Fourth stage – it’s the change of injection wells location. All injection wells must be positioned below production wells on reservoir top. Hence production wells are positioned in microanticlines, where localized (and will localize in future) ROIP, and injection wells will form marginal waterflood for these parts of oil reservoir.Fifth stage – local appliance of forced liquid production (FLP). It is recommended to apply in local parts of reservoir, which characterized by microanticlines, but haven’t well in it. It is provided to use FLP on a nearest wells for recovery of reserves.