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Tubing is a relatively small-diameter pipe that is run into a well to serve as a conduit to introduce tools, equipment and fluids into the well and for the passage of oil and gas to the field surface facilities for processing.
Tubing must be adequately strong to resist loads and deformations associated with production and workovers.
Further, tubing must be sized to support the expected rates of production of oil and gas.
Tubing is specified by grade, outer diameter, weight, and connection.
API tubing grades correspond to casing grades with the exception of P grade tubing
Tubing comes with threaded and coupled, non-upset and external upset ends.
Non Upset and Flush Joint Tubing are common in completions operations as the slick OD of the tubing allows it to pass through restrEUE and VAM (forms of External Upset) tubing is common in production strings, because of the benefit that cutting threads into the tubing ends does not reduce the body strength.
Two Step Threaded Tubing is common in work and well testing strings as it can have "gas tight" properties.