دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a fishing tool that is attached to tubing or drill pipe and lowered over the outside wall of pipe or sucker rods lost or stuck in the wellbore. A friction de- vice in the overshot, usually either a basket or a spiral grapple, firmly grips the pipe, allowing the fish to be pulled from the hole.

n: a fishing tool that is attached to the drill pipe and is lowered over the fish and engages externally. An overshot can also be used to recover a wireline survey tool (single shot).

a fishing tool designed to slip over the fish and grasp the outside.