Анотація:
New and simple construction of special technical tool and mathematical model of nonoriented
bottom drilling string assemblies on its base have been offered. This construction use to ensure design
profile parameters during drilling slant portion of the deviated and horizontal well in condition of
hole roundness loss. In base of analytical research have been specified that this technological solution
allows to ensure required path and technical – economic performances well drilling with using
assemblies with least number of support - centring elements in condition of caving.