METHOD FOR HERMETICALLY SEALING AN ANNULAR SPACE Russian patent published in 2006 - IPC E21B33/12 E21B23/00 

FIELD: method for activating a well system, which is positioned in annual space, formed between a tubular element, expandable in radial direction and passing into well borehole formed in earth formation, and cylindrical wall, enveloping aforementioned tubular element.

SUBSTANCE: well system is constructed with its possible activation by displacing circular moveable device alongside the tubular element. Method includes positioning circular moveable device around the tubular element, while moveable device has internal diameter, slightly exceeding external diameter of tubular element in its non-expanded state, and gradual expansion of a section of tubular element by moving expander through tubular element in direction of moveable device, as a result of which transfer zone of tubular element forms between expanded and non-expanded sections of tubular element. Continuation of movement of expander through tubular element when transfer zone is in contact with moveable device causes displacement of moveable device in axial direction alongside the tubular element, as a result of which moveable device provides for activation of well system.

EFFECT: simplified construction of well.

11 cl, 11 dwg