Generally, the first string of casing in a well. it may be lowered into a hole drilled into the formations near the surface and cemented in place; or it may be driven into the ground by a special pile drive (in such cases, it is sometimes called drive pipe); or it may be jetted into [...]

A short string of large-diameter casing used to keep the wellbore open and to provide a means of conveying the upflowing drilling fluid from the wellbore to the mud pit.

The first string of casing (after the conductor pipe) that is set in a well. it varies in length from a few hundred to several thousand feet. some states require a minimum length to protect freshwater sands. compare conductor pipe.

A small-diameter metal line used in wireline operations. also called slick line. compare conductor line.

A formation fluid sampling device, actually run on conductor line rather than wireline, that also logs flow and shut-in pressure in rock near the borehole. a spring mechanism holds a pad firmly against the sidewall while a piston creates a vacuum in a test chamber. formation fluids enter the tes5t chamber through a valve in [...]

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 [...]

1. an accessory system of piping to a main piping system (or another conductor) that serves to divide a flow into several parts, to combine several flows into one, or to reroute a flow to any one of several possible destinations. 2. a pipe fitting with several side outlets to connect it with other pipes. [...]

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.