Exam 2 with Answer Key - Petroleum Production - 2014 | C&PE 627, Exams of Engineering

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Me ery CPE 627 EXAM II - 2014 /) 4. See the attached plot of P vs Np, and the IPR’s for 5651 and 4000 reservoir pressures. The productivity index is 0.17 bpd/psi and pi = 5651 psia, but this is reflected in the plots. The frictional pressure drop is 0.6*q psi.. (qis bpd) The oil gravity is 0.85 g/cc and the wellhead pressure is 150 psia, and the well is 8000 ft deep. a. What is the initial production rate? b. What is the rate at pe = 4000 psia c. How long does it take for the pressure to drop to 4000 psi? (use average rate for 5651 > 4000 ) . Suppose we have a well on pump which delivers 0.05 BBL/stroke. The productivity index is 0.20 STBD/psi. We “shoot the well” and discover that when it is not pumping, the fluid level is at 3260 ft. The well is 7000 ft deep. The oil is gas free (dead oil) and has a specific gravity of 0.90. The casing is open at the top. You may ignore friction. a. What is the reservoir pressure? b. If we need a minimum of 300 feet of oil on top of the pump, what will the maximum production rate be? c. If our pump is set at 3 strokes per minute, what should the fluid level end up at?. . Suppose we have a gas well which delivers 400 psia gas at 120 F to the wellhead. The gas gravity is 0.65 and the ratio of Cp/Cv is 4.2. he choke coefficient is 0.9. We would like to “choke” the well to 500 MSCFD. a. What is the critical downstream pressure to achieve choked flow? b. What diameter in 64ths of an inch choke would we use? (you may assume choked flow for part b .. remember to just use (P2/P1)c instead of (p2/p1) for choked flow .. its not trial and error..)