Positive engagement indicator for wireline fishing operations

摘要

A method and apparatus are provided for enabling reliable retrieval of instrumentation packages from downhole locations. The tool string and/or the overshot device of the drill pipe can be fitted with a variety of mechanical, electrical, and/or magnetic sensors at one or more locations to enable monitoring of the capture process. Such monitoring enables the secure capture of the instrumentation package as well as retrieval of the instrument package to the surface with minimal damage to the instrumentation package, the overshot drill pipe, and any cables involved.