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2003 Course Reservoir Eng. - I

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Total No. of Questions : 8] [Total No. of Pages :8 P1382 [3664] - 308 B.E. (Petroleum Engineering) RESERVOIR ENGINEERING - I (412381) (2003 Course) Time : 3 Hours] Instructions to the candidates: 1) 2) 3) 4) 5) 6) 7) 8) [Max. Marks:100 Answers to the two sections should be written in separate answer books. Questions No. 4 (four) and 8 (eight) are compulsory. Out of remaining attempt any two questions from each section. Figures to the right indicate full marks. Neat diagrams must be drawn wherever necessary. Use of a non-programmable calculator, log-log, semi-log paper is allowed Assume suitable data, if necessary. If you attempt question 6, detach Figure 3 and attach inside the answer booklet. If you attempt question 7, detach Figure 1 & 2 and attach inside the answer booklet. SECTION - I Q1) a) What is reservoir engineering and how are its objectives accomplished?[6] b) c) Explain in detail classification of reserves and how are they calculated?[6] What are drive indices? [4] Q2) a) Derive the material balance equation for an undersaturated reservoir considering rock and fluid expansion. [8] An undersaturated, volumetric reservoir has the following properties: Pi = 4000 psia, Pb = 2500 psia, Sw = 30%, porosity =10%, cw = 3E-6, ct = 5E-6, Boi = 1.300 bbl/STB at 4000 psia, and Bo = 1.320 bbl/STB at 3000 psia. i) Calculate total pore volume, connate water volume and hydrocarbon volume at 4000 psia, and 3000 psia. (express in bbl/acre-ft). ii) Calculate the stock tank oil in place at 4000 psia and 3000 psia. iii) Calculate the average compressibility of oil between 4000 psia and 3000 psia relative to the volume at 4000 psia. iv) Calculate the fractional recovery at 3000 psia by two different methods. [8] b) P.T.O. P.T.O.

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