Exercise 2 Viscosity and Mud Weight

Exercise 2 Viscosity and Mud Weight - Lab Report 2 Weight...

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Lab Report 2 – Weight Control and Mud Rheology MEMO Total Points Possible +10. To: District Drilling Engineer From: student name MEMO Style +0.5 pt Re: Determine the correct model for the mud. Determine how much barite to use to increase the density of the mud. Recommendations and Conclusions: This section first followed by the discussion +0.5 pt Based on the rheometer data shown in the discussion section this mud is a Herschel- Bulkley fluid. The fluid exhibits a yield stress of 5.3 lb/100 sq ft and can be modeled using equation (1). ( 29 0.67833 f 2 f 2 n f 2 19.17 0.0202 .......... (1) lb shear stress 100 ft lb yield stress = 19.17 100 ft lb -sec consistency index = 0.2 100 ft flow behavior index = 0.67 dimensionle n o o n τ μγ γ μ = + = + = = = = ( 29 ss In order to increase the density of a 1500 bbl mud system from 9.5 to 11 ppg, the mud system should discard 120 bbls of 9.5 ppg mud. After this 130,700 lbs of barite will be needed to raise the mud weight to 11 ppg. One gallon of fresh water per 100 lbs of barite should be added to keep viscosity at the current level. The total fresh water needed is 31 bbls. If the system weight must be increased to 13 ppg at a future date the mud system will need to discard 175 bbls of 11 ppg mud before adding 190,600 lbs of barite.
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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 at Austin.

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Exercise 2 Viscosity and Mud Weight - Lab Report 2 Weight...

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