METHOD OF SYSTEM CYCLIC DEVELOPMENT OF OIL DEPOSIT AT LATE STAGE Russian patent published in 2011 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method involves pumping of displacement agent via injection wells, oil extraction via production wells, cyclic measurement of pumping modes of displacement agent and oil extraction via wells, analysis of field-geologic data on operation of wells, address control of development in isolated zones. According to invention, wells with row drilling mesh is chosen. For the first operating cycle the zones of injection wells are defined, which are isolated from other zones with rows of injection wells located on both sides of injection wells. Middle row of production wells is taken, which are located approximately at equal distance from rows of injection wells. To rows of injection wells the agent is pumped at pumping pressure, and forced pumping-out is performed from middle row of production wells with volume which is by 10-15% higher than that during pumping-out in other rows. As per analysis results of geologic production data from production wells, quantity, rate and water blockage and/or gas-cutting of oil, the decision on transition to the second cycle is taken with change of development zones perpendicular and similar to initial zones. At that, pumping modes of displacement agent to injection wells and oil extraction from production wells are chosen similar to the first cycle. As per analysis results the decisions on transition to the first cycle are taken; after that, cycles alternate.

EFFECT: method is simplified and costs for implementation of method are reduced without decreasing the efficiency of system cyclic development of oil deposit at late stage.

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