Drilling / Fishing Jars
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Fishing Tools: These are mechanical devices used to aid in the recovery of
equipment lost downhole. These devices generally fall into four classes:
- inside grappling,
- outside grappling, and
- jar or forced intensifiers.
Diagnostic devices may range from a
simple impression block made in a soft
metal, usually lead, that is dropped
rapidly onto the top of the fish so that
upon inspection at the surface, the
fisherman may be able to custom
design a tool to facilitate attachment to
and removal of the fish. Other
diagnostic tools may include electronic
instruments and even downhole sonic
or visual-bandwidth cameras.
Inside grappling device usually called spears, generally have a tapered and
threaded profile, enabling the fisherman to first guide the tool into the top of the
fish, and then thread the fishing tool into the top of the fish so that recovery