METHOD FOR EXTRACTING OIL

摘要

The inventive method consists in drilling in a productive stratum by means of a production and injection well system and in forcing said stratum with a pressure fluctuation generated by submersible rigs having an amplitude of less than a tensile fatigue resistance of a geological material. The inventive method is characterized by the following: the productive strata is drilled in to 50-80 % of a penetrated-formation thickness thereof; the pressure fluctuations, embodied in the form of an acoustic flux, are generated in the oil stratum with the aid of downhole acoustic devices suspended into the injection wells at a depth of penetration after the injection wells have been filled with oil and a formation pressure has become natural. The downhole acoustic devices produce a superpressure keeping the well in calculated production and the formation pressure at a natural level. The oil extraction is carried till the decompression value reached is no less than the saturation pressure. As far as the oil stratum is worked out, the downhole acoustic device is lifted and the formation pressure is recovered by injecting a dry gas into a gas cap. The wells are arranged in the form of an equilateral triangle. The productive well is placed in the center thereof whereas the injection wells are arranged in the angles.