ANNULAR BARRIER WITH SEAL Russian patent published in 2017 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: annular barrier with axial duration has an outer surface, facing the inner surface of the outer structure, comprises a tubular part, a release part, disposed around the tubular part, and an annular sealing element. The annular sealing element is connected to the release part and has an axial length along the axial duration of the downhole annular barrier, which is less than 50% of the length of the well annular barrier along the axial duration of the wellbore annular barrier. The annular sealing element comprises a spring element and an annular sealing coupling connected to the release part and forming a cavity of the annular sealing element between the expansion part and the annular sealing coupling. The spring element is located in the cavity of the annular sealing element. The spring element is a spring device or a spring, for example a screw or cylindrical spring, so that when the annular barrier is released, the spring element is compressed to form an inherent elastic force in the spring element, enabling the spring element to be released when the release part is released and finally installed after its release.

EFFECT: creating an improved annular barrier.

15 cl, 8 dwg