Apparatus for centralizing pipe in a wellbore

摘要: A system for centralizing casing pipe in a wellbore includes lateral pistons the side wall of string which are movable by force applied to their inner end, from retracted position within maximum exterior profile predetermined extended will move toward central borehole. Various well operations can be performed using addition function. When deploying is pistons, they released movement fixed position. The accurately determined simple retaining mechanism involving snap ring and groove on pistons.