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Unformatted text preview: PGE 430 Lab Exercise 8 To: Rig 79 From: Student Name Date: TA Version – memo style +0.5 pt Re: Viscosity problems on Rig 79. _______________________________________________________________________ _ Rig 79 has a salt water mud viscosity that is too high. The mud viscosity is so high that the pumps must be run at a slow speed to keep the circulating pressure below the maximum allowed. At the slow pump speed the hole is not being properly cleaned, even with the high viscosity. Recommendations for solving this problem and a discussion follow. Recommendations: A review of Figure 2.29 in the reference reveals that the figure is good only for fresh water base mud. The mud being used is a salt saturated mud with 6% diesel oil. A new graph shown as Figure 1 has been constructed for use with salt saturated mud with 6% diesel oil. Using this figure it can be seen that the total solids in the mud being used on Rig 79 exceed the maximum recommended amount. This results in the high viscosity seen. The solids should be reduced to below 32% by volume....
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This note was uploaded on 02/13/2012 for the course PGE 430 taught by Professor Chenevert during the Spring '06 term at University of Texas.
- Spring '06