DEVELOPMENT METHOD OF OIL DEPOSIT IN FRACTURED RESERVOIRS

摘要

FIELD: oil and gas industry.;SUBSTANCE: method involves arrangement of production and injection wells, pumping of displacement liquid through injection wells and extraction of the product through production wells. The first injection well is developed for pumping of displacement liquid with development of interval of oil-water contact (OWC) of the formation. Extraction of the product is performed from production wells with developed oil-saturated intervals of the formation, which envelop it. At that cyclic pumping of displacement liquid is performed to the first injection well with 100-200% of compensation of product extraction from production wells enveloping it. Then, after flooding in fractures of one of production wells enveloping the first injection well, isolation of the open oil-saturated interval of the formation in the same well is performed with development in it of interval of OWC of the formation and with its being changed over to the second injection well for pumping of displacement liquid with 100-200% compensation of the product extraction from production wells enveloping it after flooding in fractures of one of the production wells enveloping it. After flooding in fractures of one of production wells enveloping the second injection well, isolation of the open oil-saturated interval of the formation in the same well is performed with development in it of interval of OWC of the formation and with its being changed over to the third injection well. Gradually, as fractures are being developed, a row of injection wells is created on the oil deposit, to which displacement liquid is pumped. Periodically polyacrylamide bank is pumped into the injection wells during stops in displacement liquid pumping. When products are flooded per more than 85% in each production well enveloping the injection well, open interval of OWC in this injection well is isolated and horizontal offshoots are drilled from it in the oil-saturated interval perpendicular to direction of fractures development and this well is transferred to product recovery.;EFFECT: prevention of early oil deposit watering and improvement in development of remaining oil stock.;3 ex, 4 dwg