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2003 Course Reservoir Eng. - II

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Total No. of Questions : 8] P1276 [Total No. of Pages : 4 [3664]-315 B.E. (Petroleum Engineering) RESERVOIR ENGINEERING - II (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 No. 7(seven) is compulsory. Out of remaining attempt any three questions from Section - I any two questions from Section - II. 3) Figures to the right indicate full marks. 4) Neat diagrams should be drawn wherever necessary. 5) Use of a non-programmable calculator, log-log, semi-log paper is allowed. 6) Assume suitable data if necessary. 7) If you attempt Question No.7(seven), detach Figure one(1) from the question paper and attach it inside the answer booklet. SECTION - I Q1) a) Derive the Buckley Leverette equation and explain its usefullness. [6] b) Derive the fractional flow equation for two phases and draw and explain different fractional flow curves. [10] Q2) Explain all the thermal EOR techniques. [16] Q3) Explain surfactant polymer flood in detail. [16] Q4) Explain CO2 miscible and immiscible EOR. [18] SECTION - II Q5) What is history matching? Explain in detail the procedure. [16] Q6) a) Given a one-dimensional reservoir, with the following data, set up the matrix using the Implicit method. L = 500 ft, ct = 5E-6, P(x, 0) = 5000 psi, P(500, t) = 5000 psi, P(0, t) = 50 psi, viscosity = 5cp, permeability = 5 md, porosity = 20%. [12] b) Show the solution profiles for different times on a P-x diagram and the steady state solution. [4] P.T.O. Q7) Hanofer Oil Field, Eastern Europe, has an isopach map and production history from one of its wells given in Figure 1 and 2. In figure 2, series 2 denotes actual production and series 3 denotes simulated production. Assume any other data and clearly state it. If you attempt this question, attach figure 1 inside the answer booklet. Discovery Date : Jan, 86 No. of producing wells One (shown by triangle) Formation type limestone Depth 5000 ft Average Porosity 11% Average Permeability 43 md Average water saturation 17% Reservoir Temperature 154F Initial Reservoir Pressure 2422 psia Drive Mechanism Water Drive Oil Gravity 25 API a) Where will you drill the next well? To what depth? Explain [5] b) What waterflood pattern do you recommend? Show it on the isopach map stating clearly injectors and producers. When do you recommend the initiation of the water flood project? Why? [5] c) Which EOR process would you recommend? When do you recommend the EOR project be started? Why? [5] d) What changes in the waterflood pattern would you recommend for the EOR process? [3] Q8) Answer the questions according to the Hanofer field in Eastern Europe. Refer to Question 7 for all the data. a) Why does the production increase and then decrease twice? [6] b) In what year will the well produce 150 BOPD? Explain with mathematical calculations. [6] c) A simulation of the well is done as shown in the figure? State possible errors in your simulator. [4] [3664]-315 2 [3664]-315 3 vvvv [3664]-315 4

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