Exam2_Fall2005_KEY

Exam2_Fall2005_KEY - PGE 310 FALL 2005 EXAM 2 Answer all...

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PGE 310 FALL 2005 EXAM 2 Answer all questions on the exam paper. If you think you need more information on any problem, make a reasonable assumption about what is missing, write down that assumption, and proceed with your answer. 0.001 0.01 0.1 1 0 5 10 15 20 25 30 porosity, % permeability, Darcy 1) 10 points Your company has drilled a step-out well on a structure near an existing field. Logs of the well indicate that the porosity around that well is 23%. A production technician collected petrophysical data from old well files on the existing field and prepared the plot shown above. Each data point represents a measurement on a single core plug taken from one of several wells in a single field. Estimate the permeability in the new well. Explain whether your answer is data-driven or model-driven . Data driven, if you interpolated a permeability value in the range of values corresponding to 23% porosity in the chart. A model-driven explanation is also possible. To get credit for a model-driven answer, you must always provide a description of the model, i.e., the physical principles being invoked, to estimate the permeability.
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2) 3 parts, 10 points each . 2105 154.0 0.180 475.0 2106 170.1 0.187 525.4 2107 177.1 0.185 495.3 2108 176.3 0.158 524.3 2109 177.7 0.193 422.0 2110 176.0 0.156 409.2 2111 178.8 0.157 489.4 2112 171.9 0.189 500.8 2113 176.1 0.182 426.0 2114 178.8 0.174 443.9 2115 174.6 0.171 439.7 2116 172.0 0.186 548.6 A text file contains the results of a wireline log run in the well of Problem 1. The file contains a total of 540 lines, of which the first few are shown above. The first column is depth in ft; the second column is slowness t ; the third column is irreducible water saturation S wi ; the fourth column is resistivity R t . You wish to estimate the permeability at each depth using the following correlation: ( 29 3 6 2 1.54 10 188 t wi R k t S - = - ∆ . Write the formulae, commands, macros , etc. that you would enter into the computer to accomplish this task in each of the following environments: a. An Excel spreadsheet . Assume that you have already successfully imported the text file into columns A through D of a spreadsheet. 2105 154 0.18 475 =0.00000154*F1*G1 =(188-B1)^3 =D1/C1^2 2106 170.1 0.187 525. 4 =0.00000154*F2*G2 =(188-B2)^3 =D2/C2^2 2107 177.1 0.185 495. 3 =0.00000154*F3*G3 =(188-B3)^3 =D3/C3^2 2108 176.3 0.158 524. 3 =0.00000154*F4*G4 =(188-B4)^3 =D4/C4^2 2109 177.7 0.193 422 =0.00000154*F5*G5 =(188-B5)^3 =D5/C5^2 2110 176 0.156 409. 2
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This test prep was uploaded on 04/06/2008 for the course PGE 310 taught by Professor Klaus during the Spring '06 term at University of Texas.

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Exam2_Fall2005_KEY - PGE 310 FALL 2005 EXAM 2 Answer all...

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