1.

Which of the following is true for the ballooning effect?

A. It happens when the average pressure inside and the outside pressure of the tubing string are equal
B. It is caused by the change in the average pressure of the formation and the outside pressure of the tubing string
C. It is caused by the change in average pressure inside or the outside pressure of the tubing string
D. It happens when the change in the average pressure of the formation and the outside pressure of the tubing string are equal
Answer» D. It happens when the change in the average pressure of the formation and the outside pressure of the tubing string are equal


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