Prevention ways of BHA sticking to the wall of well

We consider prevention issues of BHA sticking as a result of its sticking to the well wall. The technological decisions on repeated reduction of the area of BHA contact with a clay crust by use of intermediate basic elements of different de- sign which have the diameter bigger than the weighted pipes, but smaller than the chisel are provided. On the basis of calculations of the intense - deformed condition of BHA in the space limited to well walls, we received the depend- ences defining placement of basic elements depending on a ratio of diameters of pipes and basic elements, and an antiaircraft corner of a rectilinear site of well.