Problem 54. Isolated volumetric reservoir with single new well flows at 100 BOPD until pseudosteady-state reached/maintained & BHP falls 130 psi over 100 hours. Reservoir 0.00001 1/psi & oil FVF 1.3 bbl/STB. Reservoir volume estimate (MMRB):
(A) 4.2
(B) Not enough info.
(C) 0.42
(D) 2.1.
Same problem shown on 12 WLT 3. Just watch units:
[0.234(100)1.3]/[1E-5(130/100)] = 2,340 Mcf/5.615 cf/bbl = 416,741 RB (C).
Original Question in the companion book does not specify if we need to calculate pore volume. It said "best estimate of reservoir volume". When I read this I think bulk volume and thus this question does not have enough information because there is no porosity. So its really subjective as to how you read the problem, you almost have to be an attorney at reservoir engineering to get some of these correct.
ReplyDeleteI'm not sure I get "there is no porosity" comment. Can you elaborate?
DeleteHello Dave, is this equation found on 12 WLT 3 found anywhere in the SPE Reference Guide? I would've thought the answer was "not enough information" if you are solely using the material balance equation on page 3 where we would need to know aquifer size, influx, and connate water saturations. Any insight would be appreciated. Thanks.
ReplyDeleteHi, in 2016 there was no Reference Guide (the exam was open book). So those exams, while still quite good for practice in 2021 will require you to use other source material. Don't worry about it; the exam writers can give you whatever info they need on each problem. It's only my recent practice tests that exclusively use the Reference Guide; be aware there are not a lot of practice problems out there that only use the RG (my 2021 in one) so you will need to get used to using some other material when practicing. It shouldn't be a big deal, but you will need to go the RG first and learn it well before using other sources. Hope this helps!
DeletePlease disregard my last question, I see that the equation is on page 16 under 1.4 Well Performance. I would think it would fall in the material balance section...
ReplyDelete