SYSTEM FOR REINFORCING A SECTION OF WELL BOREHOLE Russian patent published in 2007 - IPC E21B7/20 

FIELD: system for reinforcing a section of well borehole by means of expandable tubular element.

SUBSTANCE: system contains elongated column of pipes, passing into well borehole and equipped with tubular element in its unexpanded state surrounding lower part of pipes column. Column of pipes is additionally provided with expander positioned near lower end section of tubular element, and reinforcing means for fastening upper end part of tubular element in well borehole. Upper end part of tubular element passes into external tubular element, positioned in well borehole and surrounding upper end part. Fastening means includes means for expansion in radial direction of upper end part of tubular element up to external tubular element. Method for reinforcing section of well borehole by expandable tubular element by means of usage of system includes following operations: drilling of well borehole part using drilling column; fastening of upper part of tubular element in well borehole using fastening means; disconnection of drilling column from tubular element, raising of expander by means of drilling column through tubular element for expansion of tubular element in radial direction.

EFFECT: creation of improved system for reinforcing a section of well borehole by means of expandable tubular element.

2 cl, 9 dwg