FIELD: oil and gas industry.
SUBSTANCE: method for providing zonal isolation in a predetermined position in annulus (2) between wall (3) of wellbore (4) and downhole tubular metal structure (5) comprises inserting downhole tool (10) into the downhole tubular metal structure, placing it opposite the predetermined position, separating first section (6) of the downhole tubular metal structure from second section (7) of the downhole tubular metal structure by machining inside and along the circumference of the downhole tubular metal structure, inserting an unexpanded annular barrier between the first section and the second section, expanding the annular barrier to provide zonal isolation in a given position.
EFFECT: optimizing wells due to reliable zonal isolation.
15 cl, 15 dwg
