A standardized measure of casing-strength properties. since most oilfield casing is of approximately the same chemistry (typically steel), and differs only in the heat treatment applied, the grading system provides for standardized strengths of casing to be manufactured and used in wellbores. the first part of the nomenclature, a letter, refers to the tensile strength. [...]

A flanged fitting that supports the tubing string, seals off pressure between the casing and the outside of the tubing, and provides a connection that supports the christmas tree.

A casing in which the outside diameter of the joint is the same as the outside diameter of the casing itself.

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

A sealing device used to close off the annular space around the kelly in drilling with pressure at the surface, usually installed above the main blowout preventers. a rotating head makes it possible to drill ahead even when there is pressure in the annulus that the weight of the drilling fluid is not overcoming; the [...]

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 [...]

An accessory attached o the top of the drill pipe or tubing to form a connection with the mud system to permit circulation of the drilling mud. in some cases, it is also a rotating head.

A circular device with a frictional gripping arrangement of slips and packing rings used to suspend casing from a casinghead in a well

The location of the bottom of a string of casing that is cemented in a well. typically, a casing shoe is made up on the end of the casing at this point.

The entire length of all the joints of casing run in a well. most casing joints are manufactured to specifications established by api, although non-api specification casing is available for special situations. casing manufactured to api specifications is available in three length ranges.
a joint of range 1 casing is 16 to 25 feet long; [...]

The force exerted by a column of liquid expressed by the height of the liquid above the point at which the pressure is measured. although “head” refers to distance or height, it is used to express pressure, since the force of the liquid column is directly proportional to its height. also called head or hydrostatic [...]

Commonly called casinghead gas; gas that is produced with oil or from the casing head of an oil well.

Blade tool used to scrape away junk or debris from inside casing; run on pipe or tubing.

A procedure whereby the formation immediately below the casing shoe is subjected to a pressure equal to the pressure expected to be exerted later by a higher drilling glut density or by the sum of a higher drilling fluid density and back-pressure created by a kick.

(oil well gas) is associated and dissolved gas produced along with crude oil from oil completions.