The critical buckling load, developed by Dawson and Paslay, is generally accepted as the limiting criteria for pushing tubing into a highly deviated hole. This criteria severely limits the distance coiled tubing can be pushed into a highly deviated hole. Using actual case studies, this paper demonstrates that it is possible to safely push tubing into a highly deviated hole with compressive loads significantly higher than this critical buckling load. In some cases it has been assumed that applying internal pressure in the tubing stiffens the tubing, allowing it to be pushed farther into the hole. This paper also summarizes references which show that internal pressure in the tubing does not increase the tubing stiffness.

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