A production casing string is set at a depth of 15,750 ft. A cement slurry of 15.6 ppg has pumped and filled the casing from the top to the casing shoe while the annulus has 12.2 ppg drilling mud. The...

A production casing string is set at a depth of 15,750 ft. A cement slurry of 15.6 ppg has pumped and filled the casing from the top to the casing shoe while the annulus has 12.2 ppg drilling mud. The cement has been displaced by 11.7 ppg drilling mud until cement reached the top of the well. If the burst and collapse safety factors during pumping of cement have been estimated to be 3.5 for both cases, determine the collapse and burst rating of the casing.