Sometimes we need a lot of interview questions to be always ready for the interview:

• Navigating Tough Oil and Gas Interview Questions
•  How to prepare for an oil and gas job interview
• Interview Tips for Oil and Gas Professionals
  
•  Oil & Gas Insights

This exam was in one of the personal interviews of one of the oil companies, and we collected many responses that you can read now 

and benefit from.

The First Contestant:  

- Collapse due to external pressure within the annulus. or No volume in the tubing. Down-hole pressure collapsed tubing

The Second Contest :                                         

- Negative pressure test gone wrong, pressured up backside too high and probably empty tbg or they pulled out too fast and swabbed the brine out the tubings.

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The Third Contestant:  

- Three things I can think of : 

1- Pressured annulus above max tubing collapse.

2- Parted tubing and rotated washover pipe to fish with power swivel. 

3- Dropped tubing to bottom then latched with wash over pipe.

The Fourth Contestant:

- Pressure differential on backside greater than inside tubing when pulled! Been there done that on fishing jobs easy money.

Fifth Contestant:                      

- Running production pipe in the hole on a snubbing rig closed the slips while snubbing the joint in.

Sixth Contestant:       

- While run in hole to drilling in the top hole. The jar is open. And the string is fall in the hole .. While fishing the H.W is damage like This pic

or

- Buckling effect, this can be the result of compression on the drill pipe or due to high temperature.

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Fundamental issue:

The pipes here show clear signs of plastic deformation - in simple terms, they are permanently curved. This type of problem usually occurs for several reasons:
1- Overload:
When a lot of drag or push force is applied beyond what the tube is classified for, especially during drilling or pulling, it can easily lead to bending.
2- Excessive torque:
Applying more torque than required during drilling can wrap the tube and leave it deformed.
3- Differential adhesion or hydraulic lock:
If the tube gets stuck inside the well field due to pressure differences, and uses a lot of force to free it, it can damage the tube.
4- Corrosion and fatigue:
Over time, the tube material weakens the corrosion or repeated stress, making it more likely to bend under load.
Result:
Once the tube is deformed, it is no longer safe to reuse. It is structurally weak and may fail during drilling, faltering or even causing serious problems such as loss of well control.

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