Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations

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Title: Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations
Author: Viloria Ochoa, Marilyn
Abstract: This study presents a simplified and accurate procedure for selecting the rheological model which best fits the rheological properties of a given non - Newtonian fluid and introduces five new approaches to correct for tool joint losses from expansion and contraction when hydraulics is calculated . The new approaches are enlargement and contraction (E &C ) , equivalent diameter (ED ) , two different (2IDs ) , enlargement and contraction plus equivalent diameter (E &C+ED ) , and enlargement and contraction plus two different IDs (E &C+2IDs ) . In addition to the Newtonian model , seven major non -Newtonian rheological models (Bingham plastic , Power law , API , Herschel -Bulkley , Unified , Robertson and Stiff , and Casson ) provide alternatives for selecting the model that most accurately represents the shear -stress /shear -rate relationship for a given non - Newtonian fluid . The project assumes that the model which gives the lowest absolute average percent error (EAAP ) between the measured and calculated shear stresses is the best one for a given non -Newtonian fluid . The results are of great importance in achieving correct results for pressure drop and hydraulics calculations and the results are that the API rheological model (RP 13D ) provides , in general , the best prediction of rheological behavior for the mud samples considered (EAAP=1 .51 ) , followed by the Herschel -Bulkley , Robertson and Stiff , and Unified models . Results also show that corrections with E &C+2IDs and API hydraulics calculation give a good approximation to measured pump pressure with 9 % of difference between measured and calculated data .
URI: http : / /hdl .handle .net /1969 .1 /4334
Date: 2006-10-30

Citation

Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations. Available electronically from http : / /hdl .handle .net /1969 .1 /4334 .

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