The problem reads: Given 5-1/2” 26 lb/ft N80 casing with 40,000 psi tension: find the reduced collapse rating (if your older copy is missing pipe weight, please assume it):
The whole problem can be solved never leaving 6 DTC 4.
The 80 clues us to an max axial stress of 80,000 psi.
Add the internal pressure to compute: (40,000 + 20,000)/80,000 = 0.75.
Enter this into the GB table (ellipse of plasticity) for -0.385.
Solve using GB equation (with collapse rating from HES Redbook of 12,650 psi) for:
12,650(0.385)+20,000 = 24,875 psi.
Any ideas on how to solve this problem using the SPE reference, not the guidebook? Its a very easy problem with the guidebook but I am really struggling to find a solution with the SPE reference book.
ReplyDeleteThis is a great question. I wouldn't study that way. Bottom line: nobody has seen the EBT so be wary. One thing I would NOT assume: just because it's not in the provided reference won't ask questions about it whilst providing the necessary data in the problem itself. That's what I would do to try and catch all those people trying to slimp by without learning the SPE texts. And these problems would probably be the dividing line between P & F.
DeleteSo were I taking it in 19 I would just do as many practice problems as possible and try to learn the material, provided reference be damned (but I would know that reference well). Heck, they could even in one year work wholly out of the approved reference, and then the following year pick a whole bunch of problems from an SPE text and give the necessary charts/data, just to catch everyone trying to slip by. IMO, the only solution is to "understand" the SPE material as best as you can. Myself, I think my 2016 practice exam will be the sort of content/timing the EBT will be like (with data provided as needed) but what do I know? I'll probably be surprised at the feedback...
I am working as many practice problems as possible along with reading my SPE texts. Here is my issue, is this problem unsolvable with the SPE reference? I personally don't want to take the risk of not understanding how to do certain problems with the SPE reference in the hope that they will provide the necessary charts and information I need to solve them in a way I am already familiar with.
ReplyDeleteI found your 2016 exam workable with the SPE reference... but only after memorizing which equations have errors. It has been a really challenging year to study for this exam and I am really appreciative of the work you have put into the providing study material.
I think you are doing good; I would be very surprised if you were asked questions that required you to memorize equations not in the Update Reference.
DeleteRather, I think you may be asked questions that tests your knowledge of what the SPE equation represents; or even provided you with the needed pieces of an equation on some problem. The only way I see to deal with this is to just do problems until the material becomes familiar.
When I took the exam in 2015 I rarely used any reference but my Guidebook, and not to find equations but rather to "center" my thinking on complex subjects. It's not a plug-n-chug exam. When you study, don't forget to focus on the notes at the end of each Guidebook chapter and review the SPE Handbook for areas you aren't familiar with. I would focus more on the word problems and let the equation-based stuff be a hit-and-miss.