Oil & Gas Glossary 1.0

A cylindrical metal ring used to guide packers past casing obtrusions.

A cylindrical metal ring used to guide, and centralize, packers or tools inside casing.

A ring of wedges that supports a string of pipe or a threaded, tapered ring used for the same purpose.

A cylindrical ring, usually vise-shaped, employed to back up (or assist) a sealing member against extrusion under temperature and pressure.

A special type of flanged connection in which a metal ring (resting in a groove in he flange) serves as a pressure seal between the two flanges.

A conducting ring that gives current to or receives current from the brushes in a generator or motor.

An elastomer (seal) energized by pressure

To guide the end of a pipe into a coupling when making up a connection.

A sealing ring on either side of the center packing element to limit its extrusion

A circular seal common in the oilfield; requires deformation (squeeze) to energize and seal.

An internal mechanism employed in certain tools to lock cones to the mandrel

A cutoff pup joint below a packer used as a fluid entry device and/or seal assemblies guide

2. a removable lining or sleeve inserted or screwed into an opening to limit its size, resist wear or corrosion, or serve as a guide.

2. a device, similar to a casing shoe, placed at the end of other tubular goods.

A spring-actuated metal band or ring(ferrule) used to expand a liner patch when making casing repairs. See liner patch.

1. a cylindrical or tubular projection, relatively small in diameter, that extends below a downhole tool and helps to guide the tool to a designated spot (such as into the center of a portion of stuck pipe).

A device placed at the end of or beneath an object for various purposes (e.g., casing shoe guide shoe).

A flared-end sub run on the end of the tubing string to permit easy access of wireline tools into the tubing ID.

A flared-end sub run on the end of the tubing string to permit easy access of wireline tools into the tubing ID.

See guide shoe

The first casing or conductor string (generally with a diameter of 30 to 36 inches) set when drilling a well from an offshore drilling rig. It prevents sloughing of the ocean-floor formations and is a structural support for the permanent guide base and the blowout preventers.

A rod-like or tube-like extension below a downhole tool, such as a mill, that serves to guide the tool into or over another downhole tool or fish.

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 short, heavy, cylindrical steel section with a rounded bottom and attached to the bottom of the casing string. It contains a check valve and functions similarly to the float collar but also serves as a guide shoe in the casing.

1. a short, heavy, cylindrical section of steel filled with concrete and rounded at the bottom, which is placed at the end of the casing string. It prevents the casing from snagging on irregularities in the borehole as it is lowered. A passage through the center of the shoe allow drilling fluid to pass up into the casing while it is being lowered and allows cement to pass out during cementing operations. Also called casing shoe.

The pipe and special fittings used on floating offshore drilling rigs to establish a seal between the top of the wellbore, which is on the ocean floor, and the drilling equipment, located above the surface of the water. A riser pipe serves as a guide for the drill stem from the drilling vessel to the wellhead and as a conductor of drilling fluid from the well to the vessel. The riser consists of several sections of pipe and includes special devices to compensate for any movement of the drilling rig caused by waves. It is also called a marine riser.