METHOD TO REPAIR CASING STRING WITHOUT REDUCTION OF THROUGHPUT DIAMETER

摘要

FIELD: mining.;SUBSTANCE: method includes lowering, installation and expansion of a metal plaster in the repair interval. At the same time the plaster prior to lowering is equipped with an anchor, at the bottom - with a block having a check valve made of easily drilled material, after lowering into the installation interval, the anchor is fixed relative to the casing string by development of an excessive internal pressure, the metal plaster is expanded to the diameter equal tot he inner diameter of the casing string together with the casing string and with cement compaction behind the string, afterwards the block is broken.;EFFECT: higher quality and reliability of casing strings repair by metal plasters, reduced costs due to reduction of lowering and lifting operations.;2 dwg