relatively small-diameter pipe that is run into a well to serve as a conduit for the passage of oil and gas to the surface.

Related Terms

• Wash Over

to release pipe that is stuck in the hole by running washover pipe. The washover pipe must have an outside diameter small enough to fit into the borehole but an inside diameter large enough to fit over the outside diameter of the stuck pipe. A rotary shoe, which cuts away the formation, mud, or whatever...

• Washpipe

1. a short length of surface-hardened pipe that fits inside the swivel and serves as a conduit for drilling fluid through the swivel. 2. sometimes used to mean washover pipe....

• Stinger

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). 2. a device for guiding pipe and lowering it to the water bottom as it is being laid...

• Orifice

an opening of a measured diameter that is used for measuring the flow of fluid through a pipe, the orifice must be of smaller diameter than the pipe diameter. It is drilled into an orifice plate held by an orifice fitting....

• Tapered String

drill pipe, tubing, sucker rods, and so forth with the diameter near the top of the well larger than the diameter below....