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Acid Examples - PGE 362 Acid Examples(1 A sample acid test...

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PGE 362 Acid Examples (1) A sample acid test has been performed using 15% HCl and a limestone core. The data is shown below. Please compute the core porosity after acid break through. Math must be shown for full credit. ( 29 2 2 1.27 cm = core diameter 7.62 cm = core length 0.09 original porosity fraction 2 ml = acid injected at live acid break through 1.27 7.62 0.09 0.868 ml 2 1.27 2 7.62 2 0.207 bt pore bt d L V V V φ π π φ φ = = = = = = = = = = (2) How much acid is required to perform the following 15% HCl acid job? Math must be shown for full credit. ( 29 ( 29 2 2 100' 3' 0.2' 0.1 1.5 7.48 3 0.2 100 0.1 1.5 3158 gal s w bt HF h r r PV V φ π = = = = = = - =
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(3) On the same graph, please plot the skin as a function of acid penetration radius from the well bore for HCL in a carbonate and HF in sandstone. Stop the graph when the acid reaches the damage radius. General equations must at least be shown for full credit. 0.2' 3' 10 md 1 md For HF acid in a sandstone: 1 ln For HCL acid in a carbonate: ln ln In both equations the acid penetration radius = w s s s s a s s s
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