دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an expandable, cylindrically shaped gripping mechanism that is fitted into an overshot to retrieve fish from the borehole. See grapple.

to mill a piece of equipment (and often to catch it with an overshot).

n: fishing equipment used to recover wireline tools stuck in the hole when the wireline or cable is intact. It consists of a cable hanger, spear point rope socket, spearhead overshot, conventional overshots, drill pipe, and elevators.

n: A tool for fishing casing.

n: see casing-patch tool.

n: a special tool with a rubber packer or lead seal that is used to repair casing. When casing is damaged downhole, a cut is made below the damaged casing, the damaged casing and the casing above it are pulled from the well, and the damaged casing is removed from the casing string. The tool is made up and lowered into the well on the casing until it engages the top of the casing that remains in the well, and a rubber packer or lead seal in the tool forms a seal with the casing that is in the well. The casing-patch tool is an overshot1ike device and is sometimes called a casing overshot.

n: A kind of tool for casing with rubber packer or sealing. Used for repairing casing.

an overshot fishing tool with a bottom cutter surface to allow milling the top slips or all the slips prior to retrieving a packer.

n: an external gripping tool that allows direct circulation through the tool and the fish to keep the wellbore lubricated during fishing. See overshot.

n: The tool of fishing drill tool. Consisted by outer barrel, rubber packing element and slip system. Fishing the junk by hitching the exine of the junk.