ESSENTIAL PROPERTIES

The properties of coiled tubing are essential in the manufacturing process, depending on how it will be used. The extreme pressure in the bottom of the well bore, bottomhole pressure, can have grave effects on tubing if anything goes astray. The first major property is the yield strength the tubing can have. This is predetermined of course, and can range from 55,000 PSI to 120,000 PSI. The tubing must have enough mechanical strength to withstand the combination of forces inflicted on the job, sufficient stiffness to run down the hole to the requires depth and push with the required force, yet light in weight to reduce logistics and cost all along with the maximum possible operational existence. To design the CT up to its greatest potential, numerous tests are run in labs simulating the exact working conditions that the CT will endure. This is a very sophisticated process with the use of simulators and countless irritations with all different types of tubing. Tubing has a wide range of wall thickness, material, and diameter. The thickness can even range on a single spool of tubing if needed.

Jake Flora, Petroleum Engineer, ASRC, Alaska

Tubing that has collapsed from exceeded pressure in the inner annulus of the wellbore.