The first step in fishing loose junk is to identify what it is. This may be readily determined if something has been left in the hole on a trip or has been dropped into the hole accidentally. If the type and configuration of the junk is not known, you should consider making a lead-impression block. If the fish can be identified, visualize how it may be retrieved by placing another part or tool that is exactly the same as the fish in a casing nipple of an appropriate size to simulate the hole. Then the proposed fishing tools may be tried at the surface, and inappropriate ones can be ruled out. It is much cheaper to try a tool on the surface than to make a trip and retrieve nothing. The usual tools used ...
Get The Guide to Oilwell Fishing Operations, 2nd Edition now with O’Reilly online learning.
O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.