FinalKey(2007)

# FinalKey(2007) - Final Exam Key PGE 331 Fundamentals of Reservoir Engineering Open book notes Read each problem carefully and show all work 1

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Final Exam Key PGE 331 Fundamentals of Reservoir Engineering Open book, notes. Read each problem carefully and show all work. 1. Definitions (2 points each) In your own words define the following: a. Grid block A finite region of space over which material balances are written in reservoir simulation. b. Saturation pressure The pressure at which another phase appears c. Explicit Explicit means in plain sight. In simulation it is a sequential (marching) procedure in which pressures at one time level are calculated directly from another, without matrix inversion. d. Well model An equation describing the relationship between a well rate and the pressure drawdown (cell pressure-well pressure) in a numerical simulator. e. Solution gas drive A mechanism of primary production wherein the reservoir pressure is partially supported by gas evolution from solution. f. Constraint A recurrent quantity specified as input to a numerical simulation, usually as an upper or lower limit. g. Stabilized flow A flow condition where all the pressures in a reservoir decrease at the same rate, The rate of decrease may be zero. 2. Depletion Schematics. There is no calculation required in this problem. I expect your curves to be internally consistent and to be correct with respect to the points we have covered in class and in the text. 1

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The figures on the next pages show the depletion history (dotted lines) of a single-layer reservoir being drained by a two wells in primary recovery. Both wells have the same bottom hole flowing pressure and the same productivity index. At the times indicated below, one of the wells is shut in. Sketch (no calculation required) the curves (use solid lines) for the reservoir rate, the bottom hole flowing pressure in the remaining well, the average pressure, and the cumulative production after shut it. a. (10 points) The second well is closed in the constant rate period when the flow is stabilized. Grading: 2 pts. start of stabilized flow 4 pts. doubling of drawdown 2 pts. decrease of plateau length 2 pts. consistency of diagram b. (10 points) The second well is closed at the exact onset of the two-well depletion period. Grading:
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## This note was uploaded on 02/13/2012 for the course PGE 323K taught by Professor Lake during the Spring '08 term at University of Texas at Austin.

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FinalKey(2007) - Final Exam Key PGE 331 Fundamentals of Reservoir Engineering Open book notes Read each problem carefully and show all work 1

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