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.

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.

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 [...]

The distance across a circle, measured through its center. in the measure of pipe diameters, the inside diameter is that of the interior circle and the outside diameter that of the exterior circle.

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 [...]

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 [...]

Pressure of the annular fluid on the casing at the surface when a well is shut in.

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.

The tendency of liquids to maintain as small a surface as possible. it is caused by the cohesive attraction between the molecules of liquid.

Drill pipe, drill collars, casing, or tubing that has inadvertently become immovable in the hole. sticking may occur when drilling is in progress, when casing is being run in the hole, or when the drill pipe is being hoisted.

A small-diameter hydraulic line used to operate downhole completion equipment such as the surface controlled subsurface safety valve (scssv). most systems operated by control line operate on a fail-safe basis. in this mode, the control line remains pressurized at all times. any leak or failure results in loss of control line pressure, acting to close the safety [...]

A long, hollow cylinder, usually steel, through which fluids are conducted. oilfield tubular goods are casing (including liners), drill pipe, tubing, or line pipe

An auxiliary part (such as a coupling, elbow, tee, or cross) used for connecting lengths of pipe.

A blowout preventer that uses pipe rams as the closing elements. see pipe ram.

Pipe in which the outside diameter of the joint is the same as the outside diameter of the tube. pipe may also be internally flush-joint.