Tubing continuously wraps and unwraps over its spool and over the tubing directional arch (“gooseneck”) as it goes in and out of the well.   This bending and straightening causes an extreme amount of wear and tear. This process is known as cyclic bending and along with the internal pressure may result in a life expectancy of less than 100 cycles. Another downfall is the tendency for the walls to thin, thus increasing the diameter of the tubing as cycles increase.  Tests have shown up to 30% increase in the diameter.  This plastic type growth is sometimes referred to as ballooning.  This effect is worse on the tubing that does not rotate during deployment and the walls thin more on one side that the other.  Elongation is another effect that results from the forces of fieldwork, with reports stating up to ten feet of permanent elongation per trip!