DOWNHOLE SYSTEM Russian patent published in 2021 - IPC E21B33/127 

FIELD: oil and gas production.

SUBSTANCE: group of inventions relates to a downhole system for extracting a hydrocarbon-containing fluid in a well from a formation, as well as to a method for regulating the inflow of fluid in this downhole system. The downhole system contains borehole tube structure having an internal part; first and second annular barrier for isolating the annulus outside the downhole tube structure; inlet valve assembly installed as part of the downhole tube structure and located between the first and second annular barriers opposite the production zone to provide a fluid transfer communication between the production zone and the inner part of the downhole tube structure through the passage in the inlet valve assembly by adjusting the closure part relative to the passage. The closure part is mounted on a downhole tubular structure. Each annular barrier comprises tubular portion designed to be installed as part of a downhole tubular structure, wherein the tubular portion has an outer surface; expandable metal sleeve surrounding a tubular portion and having an inner sleeve facing the tubular portion and an outer sleeve facing the downhole wall, each end of the expandable sleeve being connected to the tubular portion; and annular space between the inner surface of the expandable sleeve and the tubular part. The first and second annular barriers are designed to isolate the productive zone when they are opened. The inlet valve assembly contains a sensor module containing sensor designed to measure at least one fluid parameter in the interior of the downhole tube structure; power source to supply power to at least the sensor; and control module to activate the control of the closure part based on the sensor measurement.

EFFECT: technical result consists in ensuring the safe operation of the well without outbursts and leaks between the first and second annular barriers by creating an improved inlet valve assembly between the first and second annular barriers, made with the possibility of its reversible regulation without using control lines or special tools.

17 cl, 10 dwg