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2003 Course Deepwater Technology

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Total No. of Questions : 12] [Total No. of Pages : 4 [3764]-383 P1496 B.E. (Petroleum) DEEPWATER TECHNOLOGY (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data if necessary. SECTION - I Q1) a) Discuss different classes, selection criteria & uses of ROV S in brief.[9] b) Write the importance of pre spud activity as penetration test and exploration test in details. [9] OR Q2) a) What is centre of gravity? Discuss the effect of following on C.G. [8] i) Effect of adding weight. ii) Effect of shifting weight. iii) Effect of removing weight. b) Draw sketch of an offshore drill ship, indicate different translational & rotational motions and types of environmental forces acting on it. [6] c) Explain: i) Q3) a) b) Ballast control. ii) Metacentre. Discuss different types of mooring lines and forces acting on mooring lines. [2] Discuss following riser components. i) c) [4] LMRP. ii) Lower flex joint. [6] iii) Mud boost line. Discuss structural design & forces acting on legs of jack up rig in brief.[8] P.T.O. OR Q4) a) Discuss different tubular joints to form a truss structure of a platform with suitable sketch. [6] b) A two cylinder drilling motion compensator, shown in the following figure is used to support 12000 ft of drill pipe in a vertical well. The adjusted weight of the drill pipe is 21.6 ppf in air, buoyed weight is 17.6 ppf. The outside dia of each motion compensator piston is 12 inches & the piston rod are 6 inches O.D. The density of steel is 65.5 ppg. i) What regulated air pressure is needed for the compensator to support? ii) The buoyed weight of drill collar? iii) What is the mud weight in the hole? [6] c) Find % offset if displacement is 100 ft & water depth is 2000 ft. [2] d) Sources of error in GPS system. [2] Q5) a) [3764]-383 Discuss step by step operations in lowering of temporary guide base, 36 hole drilling, lowering of casing & cementation. (36 ). [10] 2 b) What are different well design issues in deep water drilling? Discuss any one in detail. [6] OR Q6) a) Write short notes on: i) b) Gas hydrate. [10] ii) Down hole problems. Discuss formation integrity test and its importance in detail. [6] SECTION - II Q7) a) Explain Driller s method of well control for subsea operations. If SICP = 700 psi choke line friction loss is 200 psi. How to carry out CLFL reduction? Calculate SICP. [9] b) Discuss different types subsea vertical trees for completion, compare with suitable sketch. [9] OR Q8) a) b) Draw subsea BOP stack and procedure for pressure test. [9] A liner is planned for well. A 30 bbl cement excess volume will be used, cement will be pumped at 5 bbl/min, which generate 1000 & 200 psi friction pressure in the drill string and annulus respectively, above the liner top. The mud & cement densities are 14.4 & 16.4 ppg respectively. Determine if lost circulation will occur at any of the following conditions. i) The 30 bbl excess volume is above the liner top in static condition. ii) The 30 bbl excess volume pumped out of the hole via annulus. iii) The 30 bbl excess volume is pumped out of hole via drill pipe. Data: Drill pipe = 9,400 ft, 4.5 OD, capacity 0.01422 bbl/ft. Liner top 9,400 ft, liner depth 12,000 ft, casing seat 10,000 ft. Annulus capacity 0.05 bbl/ft, fracture gradient at 10,000 ft = 16.8 ppg.[9] Q9) a) Compare the vertical & horizontal separators from the point of advantages, disadvantages & working principle. [8] b) Discuss the deep water field planning & development considerations.[8] OR [3764]-383 3 Q10)a) What is pressure maintenance? Discuss any one EOR technique in detail. [8] b) Write different types of production platforms. Discuss design criteria.[8] Q11)a) b) Discuss reservoir field development & planning in detail. [8] Describe pipeline design consideration in brief. [8] OR Q12)Write short notes on: [16] a) Reservoir simulation. b) Storage tank. c) Logistic consideration in drilling, production. d) Handling & transportation of oil & gas. Y [3764]-383 4

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