Borehole drill pipe continuous side entry or exit apparatus and method

摘要

A side entry sub for use in a drill pipe string which permits continuous injection and/or removal of a wireline equipped with analitical instruments within the hollow of the pipe without interrupting the connection or resulting communication between the wireline and tool apparatus. The operation is performed with the top power device connected to the drill pipe string and may be used during pressure application of drilling mud. Such a device permits location of a stuck pipe without disassembly of the top power drive.