METHOD FOR INTENSIFICATION OF OIL PRODUCTION IN HIGHLY WATERED FORMATIONS Russian patent published in 2024 - IPC E21B33/14 E21B43/25 

FIELD: mining.

SUBSTANCE: invention relates to a method for intensifying oil production in highly watered formations. Method includes lowering into the main borehole of the hydraulic fracturing assembly with a flow-type hydraulic pulsator containing a bypass hole, two packers-anchors and an inter-packer port, as well as turbines. Method also includes lowering of coiled tubing pipe and hydraulic monitor. Method also includes drilling from main barrel network inlet through water-bearing zone of formation into oil pillar, drilling out from network input oil pillar selective network of radial channels, tight connection by means of packers-anchors to inter-packer port of network input and the whole network of radial channels. Method also involves pulse pumping through network input of process agents into the network of radial channels by means of a turbine periodically closing the bypass hole of the hydraulic pulsator with a flow interrupter, creation of a single cycle pilot gas-hydraulic fracturing of rocks and main hydraulic fracturing with localization of main crack in oil pillar. Method also includes extraction of residual oil pillar reserves through network input of main shaft. Oil production intensification is carried out with reduced effect of formation watering. Descended in the main borehole of the well, the hydraulic fracturing assembly is equipped with a diverter, which is made in the form of an internal channel of a flowing hydraulic pulsator with an inter-packer port and the possibility of passing through itself a coiled tubing pipe, a hydraulic monitor, and also liner with swellable packers. Drilling of network input and drilling out oil pillar by selective network of radial channels is carried out by coiled tubing and hydraulic monitor through inter-packer port as part of hydraulic fracturing assembly after its lowering into the well. After drilling oil pillar with a network of radial channels, the network input with entry into the oil pillar and the internal channel of the introduced diverter are fixed by liner with two swellable packers at its ends to cover the annular space of the liner by these packers. Hydro-pulse injection of process agents into the formation, creation of pilot gas-hydraulic fracturing of rocks and the main hydraulic fracturing of the formation is carried out after lowering the liner, activation of swelling packers and isolation of the water-bearing part of the formation. Turbine for shutting off the bypass hole of the hydraulic pulsator with a flow interrupter is made detachable and is lowered into the main shaft separately with a stream of liquid after lowering and attachment of the liner with the possibility of its landing in the upper part of the internal channel of the diverter opposite the bypass hole, which is controlled from the wellhead.

EFFECT: reduced negative effect of water-bearing part of formation on intensification of oil production, increased accuracy of localization of main fractures of hydraulic fracturing, reduced accident rate of operations, increased oil recovery of residual reserves as a whole.

1 cl, 5 dwg