ANNULAR BARRIER HAVING WELL EXPANSION TUBULAR ELEMENT Russian patent published in 2020 - IPC E21B33/127 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to an annular barrier, a well completion system, a method of making an annular expansion tubular element of an annular barrier. Annular barrier is intended for opening in well in annular space between well tubular structure and inner surface of casing string or well bore to provide isolation of zone between first zone and second zone of casing string or well bore. Annular barrier extends in axial direction and comprises tubular part representing separate tubular part or part of casing string for installation as part of well tubular structure. Annular barrier also comprises a downhole expanding tubular element, intended for opening in well in annular space from first outer diameter (D₁) to second outer diameter (D₂) for abutment to inner surface of casing string or well bore. Downhole expansion tubular element is elongated in axial direction and has a first end section, a second end section and an intermediate section between the first end section and the second end section, wherein the bore expansion tubular element surrounds the tubular part and each end section of the borehole expansion tubular element is connected to the tubular part and elongated along the axial direction. Annular barrier also comprises annular barrier space between tubular part and well expanding tubular element. Downhole expanding tubular element is made from one metal tubular billet consisting of one metal material. Metal material of end sections has higher yield strength than metal material of intermediate section.

EFFECT: technical result is creation of improved expanding tubular element.

15 cl, 12 dwg