Oil & Gas Glossary 1.0

A short length of pipe (a nipple) installed on top of the blowout preventer. The top end of the nipple is flared, or belled, to guide drill tools into the hole and usually has side connections for the fill line and mud return line.

A special nipple made up in the tubing, casing, or drill pipe string the configuration of which is such that a tool contacting it can pass through only if the tool is in the proper position or configuration.

Nipple; a device through which fluid is circulated.

In drilling, to assemble the blowout preventer stack on the wellhead at the surface.

A very short piece of pipe having threads over its entire length.

A short, threaded tubular coupling used for making connections between pipe joints and other tools.

A threaded nipple with a rounded, closed end used to stop up a hole or close off the end of a line.

A small section of pipe in the top of a tank through which a tank may be gaged.

A hanger used to lock instruments into seating nipple (pressure/temperature bombs, etc.).

Sealing members at the production tubing for landing inside the packer's seal bore.

The smaller of the side fittings on a bell nipple, used to fill the hole when drill pipe is being removed from the well.

Same as seal nipple assemblies.

A bottomhole choke run on wireline and landed in a nipple profile in the tubing string.

A mechanical arrangement that prevents the upward movement of certain pieces of equipment installed in a well. A sucker rod pump may use a mechanical hold-down for attachment to a seating nipple.

A short threaded nipple screwed into the open end of the coupling and over the threaded end of casing to protect the threads from dirt accumulation and damage. It is made of steel or plastic. Also called thread protector.