A multiphase oil mix (GOR of 800 SCF/STB) flows through a 12/64-inch wellhead choke at 200 bfpd. Choke pressure equations (Gilbert, Ros, Baxendell, or Achong) are compared. The maximum pressure difference? (A) 175 psg; (B) 150 psig; (C) 125 psig; (D) 100 psig.
See 8 FAC 2. All numbers are the same except flow is 400 bfpd. To check the answer: divide high/low answers (1405 Gilbert/1105 Achong) by 2 (703/553) and subtract: 703-553 = 150 for (B).
Of course this is just to check. Always do problems as if the answer is not hidden in the Guidebook...
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