# Petroleum Production Operations Questions and Answers – Completion Equipment – Effect of Pressure and Temperature Changes

This set of Petroleum Production Operations Assessment Questions and Answers focuses on ” Completion Equipment – Effect of Pressure and Temperature Changes”.

1. Changes in pressure and temperature can unseat a packer.
a) True
b) False

Explanation: The statement is true. Changes in pressure and temperature can unseat a packer if the packer is not properly seated in the casing wall. With changes in pressure and temperature expansion or compression takes place and if this happens then the elastomers or rubber element may unseat from its place.

2. What is Hooke’s Law?
a) Strain in a solid body is directly proportional to the applied stress without the elastic limit of that solid body under consideration
b) Strain in a solid body is directly proportional to the applied stress within the elastic limit of that body under consideration
c) Strain in a solid body is inversely proportional to the applied stress within the elastic limit of that solid body under consideration
d) Strain in a solid body is inversely proportional to the applied stress without the elastic limit of that solid body under consideration

Explanation: Hooke’s law is a law of physics that states that the Strain in a solid body is directly proportional to the applied stress within the elastic limit of that body under consideration.

3. 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

Explanation: Ballooning is the effect that can be seen in Oil and Industry in the upstream section. It is caused by the change in average pressure inside or the outside pressure of the tubing string. When the change in average pressure inside is greater than the outside pressure of the tubing string then it is called a Ballooning effect and the reverse is termed as Reverse Ballooning. In Ballooning effect the length of the string decreases but in reverse ballooning effect the length of the string increases.

4. The pressure changes can unseat the packer.
a) True
b) False

Explanation: The statement is true. The pressure changes can unseat the packer. A force is generated or induced due to the pressure changes inside the tubing and the annulus. So, thermal expansion takes place because as the pressure is rising, temperatures too increase. Hence, the packer unseats.

5. What is Packer Setting Force?
a) The tensile force used to set the packer
b) The initial compressive or tensile force used to set the packer
c) The initial compressive force used to set the packer
d) The force used to retrieve the packer

Explanation: To set a packer at a particular depth the completion engineers have to set this properly in place. For the packer to set, an initial compressive or tensile force is used to set the packer and this force is termed as the Packer Setting Force.
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6. Which of the following is true for Pipe Buckling?
a) It happens when the average pressure inside and the outside pressure of the tubing string are equal and shortening of length because of the tubing being in a spiral shape
b) It is caused by the change in the average pressure of the formation and the outside pressure of the tubing string and shortening of length because of the tubing being in straight shape
c) It is caused when the average pressure inside the tubing string is greater than the outside pressure of the tubing string and shortening of length because of the tubing being in a spiral shape
d) It happens when the change in the average pressure of the formation and the outside pressure of the tubing string are equal

Explanation: Pipe Buckling happens when the average pressure inside the tubing string is greater than the outside pressure of the tubing string. This always shortens the length of the Pipe. The tubing is shortened by deformed into a spiral shape.

Sanfoundry Global Education & Learning Series – Petroleum Production Operations.