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HWK 9 solution

# HWK 9 solution - PGE 362 Homework 9 Solution Due at the...

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PGE 362 Homework 9 Solution Due at the start of lecture on April 27 (1) Please determine the gravel mesh to use and the likely skin caused by the gravel pack using the following data set. You may use the Schwartz correlation for gravel size. (Hint - follow example 6-2 in the text.) 40 g 0.057" 500 md 30' 0 0.3" number of perforations = 120 0.7 BHT = 180 deg F BHP = 4,000 psi Casing ID = 5" Hole Diame g f perf D k h s D γ = = = = = = ter = 8.75" Estimated initial gas rate = 10 MMScf/Day According to Schwartz: ( 29 ( 29 min max 0.615 0.057 0.035" 20 mesh 1.383 0.057 0.079" 10 mesh g g D D = = 2245 = = 2245 Mesh sizes worth a total of +2 pts. The skin is: ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 10 2 4 2 1.34 11 5 10 2 4 2 5 2.45 10 96 8.75 5 / 2 1.875" 8.4 10 5 10 19,394 96 500 30 1.875 2.45 10 0.7 500 30 1.875 19,394 10,000 330.5 5 10 0.3 120 0.0243 0.3 120 g g p p x khl khl s q k D n D n l x x x s x γ β μ β - - - = + = - = = = = + = Note that turbulence is the most important part of this skin. Skin worth +1 pt.

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(2) Please determine the depth to the operating valve and the locations of the unloading valves, using the approximate technique shown in the notes, for the following well. Please show the pressure traverse graphs, which may be done in Excel or by hand. Assume the unloading injection pressure remains a constant during unloading operations. L g 7,000' 1 STB/Day/psi BHT = 175 deg F
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HWK 9 solution - PGE 362 Homework 9 Solution Due at the...

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