HORIZONTAL WELL FORMATION ISOLATION DEVICE Russian patent published in 2021 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, namely to devices for isolating zones of water inflows during the operation of oil wells, including those with zones of different permeability in side and horizontal wellbores. The device for separating the formation of a horizontal well includes connected longitudinally corrugated pipes with sealing elements closed around the pipe perimeter, upper and lower cylindrical sections. The lower cylindrical section is equipped with a shoe with a valve, and the upper - with a threaded landing sub for connection to the pipe string. The upper cylindrical section with the landing sub is also equipped with upper and lower punches. The upper punch is made movable relative to the landing sub and interacts with the upper rolling of the upper cylindrical section when pressure is created in the landing sub. The lower punch is made immovable relative to the landing sub and interacting with the lower rolling of the upper cylindrical section. In addition, the landing sub is equipped with a ball seat and bore. The shoe is installed in the lower cylindrical section with rolling and is made of a cement-concrete mixture and with ability to exit the lower cylindrical section when a certain pressure is created. In this case, the outlet pressure of the shoe is lower than the outlet pressure of the upper punch.

EFFECT: proposed device is reliable in operation, allows being installed in horizontal wells, including several devices for dividing a horizontal wellbore into several sections, and removing the shoe with its simultaneous destruction without the use of special technical means.

1 cl, 1 dwg