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

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 tubing. Down-hole pressure collapsed tubing

The Second Contest :                                         
- Negative pressure test gone wrong,pressured up back side to high and probably empty tbg or they pulled out too fast and swabbed the brine out the tubings.

The Third Contestant:  
- Three things I can think of : 
1- Pressured annulus above max tubing collapse .
2- Parted tubing and rotated washover pipe on 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 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 drill pipe or due to high temperature.

The seventh contestant:
- Waited too long to fill pipe when running in long string. That probably started floating back out of the hole n had to chain it down before realized had to fill pipe on way in hole.
The eighth contestant:
Defferntial pressure between annular & inside tubing due to not filling either in or out tbg during RIH, Could happen while setting hydraulic packer


This was a Mud Pump Pulsation Dampener. Any idea what happened?


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

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:

" Not drained properly in the cold? Froze and the expansion blew it? "
The second Contestant:

"Wrong type of gas in colder climates. Probably froze and expanded. Usually when you don't use Nitrogen"

The Third Contestant:

"That is cast. Must have been damaged during handling or quality issue and that led to the parting when under pressure"

The Fourth Contestant:

"The pop off valve didn't work properly or a plug bit may do it "

Fifth Contestant:

"If it was filled with oxygen? The bladder would be in outer space.Likely frozen or a valve shut a pop valve not working"

Sixth Contestant:

"My guess would be they probably didn't drain it when they left for a few days and it froze and cracked and then when they come back and fired the rig up and when the bladder expanded it finished blowing it out"

The seventh Contestant:

"Bag leaked and they were running high pressure cavitation likely gave it away"

Eighth Contestant:

"Someone charged the dampener with oxygen instead of nitrogen"

Ninth Contestant:

"Maybe Nitrogen cylinder use in filling the pulsation dampener contain some % of Oxygen or the reset gauge not working and over pressure burst the pulsation dampener"

Tenth Contestant:

"To much pressure. Pressure hammer. Liquid and air causes pressure hammer.!!"

Eleventh Contestant:

"There was no pressure relief valve installed in the line coming from the pump."