Татарский Государственный Научно-Исследовательский И Проектный Институт Нефтяной Промышленности
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FIELD: mechanical engineering. SUBSTANCE: expanding members are made up as truncated segments of a ball and mounted on axles. The expanding members bear on the planes of the housing which form a pyramid whose top lies at the axis of the housing from the side of the rear portion of the expander. The expander is lowered on a column of drilling pipes into a well wherein it rolls over the inner surface of the overlapping member, straights and expands it until it tightly abuts against the walls of the well. EFFECT: enhanced efficiency. 2 cl, 4 dwg