FIELD: soil or rock drilling; mining.
SUBSTANCE: group of inventions relates to well annular barrier, well annular barrier system. Downhole annular barrier is intended for expansion in annular space between well tubular structure and wall of well bore or other well tubular structure in well to provide isolation of the zone between the first zone having the first pressure and the second zone having the second pressure of the well shaft. Annular barrier comprises tubular part made with possibility of installation as part of well tubular structure, expanding metal coupling surrounding tubular part. Inner surface of the coupling faces the tubular part, the outer surface faces the wall of the wellbore. Each end of coupling is connected to tubular part - annular space between inner surface of expanding metal coupling and tubular part. Annular barrier comprises the first hole connected to transfer fluid medium to the inner part, the second hole connected to transfer the fluid medium to the annular space, and the passage containing the first part of the passage and the second part of the passage. First hole and the second hole are located in the first part of the passage and shifted along the length of the passage. Annular barrier comprises piston arranged in passage. Piston comprises first piston part having outer diameter substantially corresponding to inner diameter of first passage part, second piston part having outer diameter substantially corresponding to inner diameter of second passage part. Piston comprises through passage providing connection with possibility of fluid transfer between first and second part of passage. Piston contains a destructible element preventing movement of the piston until preset pressure is achieved in the passage.
EFFECT: technical result is creation of improved annular barrier.
19 cl, 11 dwg
