WELL FORMATION TREATMENT DEVICE Russian patent published in 2021 - IPC E21B33/1295 

FIELD: oil and gas industry.

SUBSTANCE: invention relates in particular to devices for separating the downhole space for pumping various reagents into the formation. The device for treating a formation in well contains an inflatable packer, which is lowered on tubing, consisting of a cup installed between the stops. The cup cavity is communicated with the tubing through a check valve installed on top of the packer and configured to prevent the inflatable packer from moving to the operating position when it moves from the well surface to the installation interval. Drain valve is located below the packer and is configured to provide fluid flow through it after the packer has moved to the operating position under the action of excess pressure. Cup and packer stops are installed outside the tubular body, connected from above with a check valve and communicated with the cup cavity by at least one radial channel. Cup is rigidly connected to the stops, one of which is movable with the possibility of hermetic longitudinal movement along the body to the other stop when the pressure in the cavity rises. Drain valve is made in form of a plug of the packer body, overlapping the inner longitudinal space of the body with possibility of detaching at pressure exceeding pressure of transition to the operating position. Check valve is connected to the tubing with an adapter inserted into the check valve, and is fixed in it by shear elements that break when the packer is lifted to prevent damage to integrity of the lift tubing.

EFFECT: increase in reliability of packer installation and elimination of emergencies when lifting the packer, due to the provision of possibility of automatic disconnection of the pipe string.

4 cl, 3 dwg