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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 | |