[QUOTE=DDdon;40465]I’m going to take a wild stab here and assume that what has been referred to as “Bladder Effect” is more commonly known as “Ballooning”. Below is from the SPE Bulletin Board. I offer it “as Is” with no commentaries. Hope it doesn’t add too much to the confusion.
[I]2) Wellbore Ballooning [/I]
[/QUOTE]
Thanks for your input, but Wellbore Ballooning is something different to Bladder Effect , and relates to drilling in open hole sections.
Bladder Effect is mud hydrostatic from the riser affecting the annular/rams in the BOP from above.