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2003 Course Natural Gas Eng.

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Total No. of Questions : 8] P1275 [Total No. of Pages : 3 [3664]-311 B.E. (Petroleum Engineering) NATURAL GAS ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answers to the two sections must be written in separate answer books. 2) Question number three (3) and six (6) are compulsory. 3) Answer three questions from each section. 4) Figures to the right indicate full marks. 5) Neat diagrams should be drawn wherever necessary. 6) Use of a non-programmable calculator is allowed. 7) Assume suitable data if necessary and clearly state it. 8) Graph of z factor attached. SECTION - I Q1) a) b) Calculate the reserves in a gas field of 2000 acres, with 10 ft sand thickness, 12% porosity, 15% water saturation, BHP = 3000 psi gauge, BHT = 200 F. The natural gas has the following Mole composition: C1 = 0.85, C2 = 0.05, N2 = 0.1. [6] Find viscosity, molecular weight, specific gravity, pseudo critical properties, Z factor, Bg. Gas data : Pci, Tci are : 668, 708, 493 psia; 343, 550, 227 R. i and i are 0.01, 0.09, 0.04 and 0.001, 0.002, 0.0015 cp respectively. Explain the charts you use to correct for water? Draw the graph of viscosity and Bg versus pressure. [10] Q2) What is an inflow performance curve for a gas reservoir? What is an outflow performance curve? What is a tubing intake curve? Plot all on the same graph? What is the usefulness of this graph? Explain in detail with equations. [16] Q3) For the well with the following parameters; depth of 5790ft, gas gravity is 0.6, Pts = 2300 psia, and average temperature of the flow string is 117 F. Gas flow rate = 5MMscfd, D = 2 inches, Twf = 160 F, Ttf = 83 F, Ptf = 2122 psia, Length of tubing = 5700 ft, well is vertical. State your assumed values clearly and only do one iteration to find the flowing bottom hole pressure, and temperature and static bottom hole pressure. Tpc = 358 R, Ppc = 672 psia, [18] f = 0.015, z = 0.82. P.T.O. Q4) Derive the equation for gas metering. [16] SECTION - II Q5) a) What is the criteria for choosing a H2S removal process? b) Draw a process flow diagram showing the removal of hydrogen sulphide. [16] Q6) a) What is the maximum pressure at which a 10 inch nominal pipe size (OD = 10.75, ID = 10.02) can be operated? Calculate the maximum through put for a 40 mile pipeline of this type. Assume e/d = 0.002, c = 0.05, E = 1.0, Y = 0.4, S = 35,000 psi, Tav = 100 F, viscosity = 0.01, Z = 0.74, specific gravity = 0.7, thickness = 0.73 in. Assume 0.0 psia minimum pressure. [8] b) If half the section of the pipeline diameter is doubled, find theoretically what happens to the flow rate. [10] Q7) a) b) Draw a diagram of a centrifugal compressor and name its parts. Write a note on reciprocating compressors. Q8) Write short notes on: [6] [16] a) Pipeline efficiency and transmission factor. b) Compression processes. c) Gas hydrates. d) Two phase flow. [3664] - 311 [10] 2 Y [3664] - 311 3

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