FIELD: mining.
SUBSTANCE: group of inventions is used in the development and operation of oil wells. The method includes sequential hydraulic fracturing and flushing of the annular gap in the inter-packer space of each interval of the productive formation. The interval to be processed, located in the space between the packers, is fixed with a mechanical anchor and the working fluid is supplied under pressure to the tubing cavity, the hydraulic fracturing port, and the interval of the productive formation is isolated by packers with cup sealing elements. After hydraulic fracturing, the annular gap is flushed in the inter-packer space. In the first cycle, debris is washed out from the upper area of the gap through the frac port windows up the tubing. In the second cycle, debris is washed out from the lower region of the gap between the packers and cup seals, moving the mixture along the internal cavity of the device beyond its limits into the well. The device contains a mechanical anchor (1), a lower through-hole packer (3), a hydraulic fracturing port (4), an upper through-hole packer (5) and a centralizer (6) installed in series on the tubing. Continuous packers (3) and (5) are equipped with cup seals (8) and (9), which are directed towards the frac port (4). The housing of the hydraulic fracturing port is divided by a partition into an upper part, in which windows are made, and a lower part, in which flushing holes are located, which provide a hydraulic connection between the packer annular gap with the internal cavity of the device. The distance between the bottom bore packer and the flushing holes does not exceed two casing diameters.
EFFECT: efficiency of treatment of the productive formation, reliability increases, the accident rate decreases, and the service life of the device increases.
7 cl, 8 dwg
