METHOD FOR OIL BED DEVELOPMENT Russian patent published in 2015 - IPC E21B43/22 C09K8/582 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil and gas production industry and can find application in developing heterogeneous terrigene or carbonate producing beds. In the method for an oil bed development, involving the oil bed water-flooding, injection of water solution banks containing alkali, a polymer, a surfactant, a microorganism culture and a nutrient medium, into injection holes, and sampling of products from the production wells, at the initial stage a deposit is developed by water-flooding in an amount adequate to achieve the collected compensation of water-flood liquid sampling of not less than 50%; once the oil sampling reaches 70% of the initial recovered reserves, residual prospective oil distributed over specific 1 m² is mapped; the worked-out compartments are detected to inject the above solution into the centre injection holes with the following proportions, wt %: alkali - no more than 5, polymer - no more than 1, surfactant - no more than 0.5, microorganism culture - no more than 0.05, nutrient medium - no more than 0.5, water - the rest with varying the concentration C of the ingredients in the above solution proportional to the specified prospective oil for each C centre is determined depending on $$C_n^k=y_n\cdot C_{\max }^k,$$ wherein k is a type of the ingredient, n is the number of the centre, y is a proportionality factor of each centre; y is calculated by a linear equation y=a·x+b, wherein x is the specific prospective oil of the centre, t/m², a, b are linear equation factors determined if y for x_max equals to 0, and if x_min equals to 1 from a system of equations wherein x_max and x_min are the maximum and minimum specific prospective oil values, respectively; injection cycles of the bank injection are repeated if an oil flow rate decreases to the pre-injection level.

EFFECT: higher displacement factor and better oil recovery of the productive formation.

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