Moving carrier for intervention modules in a well, such as a dissolution pipeline.

摘要

Appts. for supporting selected examination and repair modules at any desired level inside a vertical pipe (I) comprises a second pipe (3) which is above pipe (I) and accommodates a carriage (3) which an be lowered into pipe (I) on the end of one or more chains (15) moved by a stepping motor and ratchet drive on the wall of pipe (3). A flexible cable (5) including electrical and/or fluid flow ducts connects external power supplies and monitors to the carriage (13) whose lower section carries the modules.