DEVICE FOR INTERVAL PRESSURE TESTING OF WELLS AND RESERVOIR STIMULATION Russian patent published in 2023 - IPC E21B33/124 E21B33/127 

FIELD: mining; oil industry.

SUBSTANCE: invention is related to packer devices for selective injection of insulating materials, interval acid treatments, shutdown of flooded reservoirs during well repair during their development and operation. The device for interval pressure testing of wells and stimulation of the reservoir includes upper and lower assemblies, each of which contains a shaft with an upper stop, a hydraulic sealing element with upper and lower end fittings with the possibility of axial movement along the wellbore and with formation of a sealed annular working chamber communicated with the internal shaft cavity, each shaft has radial holes overlapped from the side of the annular working chambers with check valves, the top stop of the top assembly shaft is rigidly fixed and placed above the top assembly hydraulic sealing element, longitudinal recesses are made on the outer surface of the top assembly shaft below the top assembly hydraulic sealing element, on top of which a spiral spring is installed, which rests on the limiting stop and is configured to press the hydraulic sealing element against the upper stop in the initial position. A bypass valve is installed between the upper and lower assemblies. The upper and lower assemblies are oriented in the same direction so that their upper stops are located closer to the wellhead. The upper stop of the lower assembly is rigidly fixed on the shaft and is located above the hydraulic sealing element of the lower assembly, and below the hydraulic sealing element of the lower assembly, outside the cavity of the sealed annular working chamber, there are longitudinal selections, on top of which a spiral spring is installed, supported by the limiting stop and made with the possibility of pressing the hydraulic sealing element to the upper stop in initial position. The upper stops of the upper and lower assemblies are equipped with cups with seals. The hydraulic sealing elements of the upper and lower assemblies are reinforced with reinforcing wire frames.

EFFECT: increasing the operational reliability of the device when lifting the device after unpacking due to orientation of the shafts of the upper and lower assemblies in one direction, which prevents packing of the lower hydraulic sealing element, as well as in improving the technical characteristics due to the increase in the bearing capacity of the hydraulic sealing elements.

5 cl, 8 dwg