METHOD AND DEVICE FOR SUPPORTING INCOMPETENT ROCKS AT EXTENDED AREAS OF WELL BORES Russian patent published in 2012 - IPC E21B29/10 

FIELD: oil and gas production.

SUBSTANCE: method includes assembling of profile overlapping device with cylindrical areas at the ends consisting of shaped tubes sections connected by welding along profile end faces, note that the sections are rigidly connected between themselves, mounting of shoe overlapping device with back-pressure valve from below, and from above flaring device with roll-forming head located in the upper cylindrical area of the overlapping device, descending of the overlapping device into mounting area in the well via the string connected between themselves by means of flaring device connection, extension of profile areas by pressure and final pressing of the overlapping device against the well walls by roll-forming head. Note that the sections are manufactured from not less than three shaped tubes without cylindrical areas except upper and lower sections that are equipped by corresponding cylindrical areas. All non-detachable connections of the sections are made of welded joints of corresponding profile face ends, note that expanding of upper cylindrical area is done by flaring device, after that this area is calibrated by roll-forming head with string lifting before final pressing.

EFFECT: structure simplification, time and material expenses are decreased.

2 cl, 1 dwg