Problem 1. NG, SG 0.70 through ½" choke at 500 psig, 140 dF. 2,900 MCF/day is closest to: (A) 20% high (B) 10% high (C) Accurate (D) 10% low.
This solution is shown in the Guidebook 8 FAC 1-2. At said conditions, z = ~0.95 (find using 9 PVT 2 with preferred z chart; the Guidebook walks one through the psuedocritcal calculations).
Once you have z, flow computes to 2,900 MCF/day or (C). Note the Guidebook comment how estimating z = 1 gets you close, but this problem demands an exact answer, so you can't risk estimating.
How do you use the table on 9 PVT 2 to get an exact value of "z"?
ReplyDeleteYou use the chart to get Ppc & Tpr, then equ for Pppr & Tpr, then z-chart (get from TS1 or TS8). The Guidebook walks you through the steps up until the z-chart.
DeleteTS1/TS8?
Deletesir, my question is different, Can you tell me the names Of different "Science Laws " Like :-Darcy Law,Stoke's Law for slip velocity calculations, ... used in petroleum industry.
ReplyDeleteTHank YOU
Clearly one cannot list EVERY "science law" used in the "petroleum industry". Think about it: the laws are used, plus the boundary of petroleum science, must be defined first.
DeleteOn the exam you would have to be given a list (multiple choice) to choose from. But there is no way to build a comprehensive list until you first define your boundaries.
how to get a free pdf of M. A. Mian Petroleum Engineering Handbook for the Practicing Engineer, Volume. 1
ReplyDeletesir, i am searching for M A Mian book which you have suggested , but I couldn't find its free pdf on internet, can you help me get this book.
ReplyDeleteemail id - adityasahu9600@gmail.com
thank you very much
It's out of print and I think it's a Google book for sale.
Deleteok sir, thank you for your reply, I thought you might be having this book in pdf form, and you may send me this through email.
Deletethank you
Hi David, I understand this question and have used your guidebook to come up with the correct answer.
ReplyDeleteHowever, if using only the 2019 Update Reference guide that will be provided during the exam, I can not find a way to solve this problem. The Rawlins equation in the Reference Guide (chapter 4, pg 111) is in a different form.
I appreciate your insight,
Paul
Paul, since this is the first year for EBT I could easily see tons of problems with enough "input" data and equations to test the engineer's knowledge. I wouldn't worry about the details but rather try to get the concepts. Even word problems can be given that don't reference direct equations at all but rather test understanding. That's the intent of this problem, not to plug and chug. I think it dangerous to get too caught up in the new reference, except possibly as a memory anchor, to help one remember concepts. Hope this helps!
DeleteAny new test guides or information out for the 2020 CBT exam?
ReplyDeleteI'm updating the 2016 practice problems using the CBT provided resource and putting this on the blog. This year I will update this problem set using the new CBT reference methodology so as to "wean" folk off the Guidebook during the exam. The GB is still useful for studying but you really need to do the problems using the new Reference Guide (provided with the exam)
DeleteCan anyone confirm that the 2020 CBT exam will be arranged by discipline? ie drilling, reservoir, production, formation evaluation, etc. ?? thanks --JAT
ReplyDeleteRead the comments on the 2020 exam for this answer.
DeleteHi David,
ReplyDeleteFor this question I see you provided a table of C values that goes up to a 3/4" Orifice. If the orifice size was greater than 3/4" (say 1" or 1.5") how would you go about calculating this C value?
Since the exam is now closed book, this isn't the sort of problem that would be given without the necessary inputs given...but it would likely test your knowledge of the the C value represents. Is this what you are getting at? And does this answer your question?
DeleteYes, I'd like to know, what does the C value represent?
ReplyDelete