MODELLING THE RHEOLOGY AND DETERMINATION OF FLUID LOSS OF DRILLING MUD FORMULATED FROM ORGANOPHYLLIC CLAY DEVELOPED FROM LOCALLY SOURCED NIGERIAN BENTONITIC CLAY

Bala Usman, S. Bilal, S. M. Shuwa

Abstract


In this work, organophyllic clay was developed from Nigerian bentonitic clay sourced from Sabon Garin Ngalda and Wyoming standard bentonite. The organophyllic clays were characterised using x-ray diffraction (XRD) and montmorillonite peaks at 2Ө of 5.8870 and 4.1060 for raw local clay and organophyllic local clay respectively was noticed, indicating that the clay is bentonitic. Water in oil emulsion drilling mud was formulated from the organophyllic clays, the rheological and filtration properties of the drilling mud formulated using oil to water ratios of 90:10 and 80:20 volume percent were measured and modelled into rheological models. 90:10 formulations were best fitted into Herschel Bulckley model with R-square values of 0.9897 and 0.9958 for organophyllic Wyoming formulation and organophyllic local bentonite respectively with sum of square errors of 0.001874 and 4.19E-04. 80:20 formulations were best fitted into Herschel Bulckley and Bingham plastic model with R-square values of 0.9996 and 0.9855 for organophyllic local clay and organophyllic Wyoming clay respectively with sum of square errors of 6.93E-05 and 0.001349559 respectively. Herschel Bulckley model was found to estimate the initial yield stress better for 90:10 and 80:20. 90:10 formulations have shown consistency indices of 0.7548 and 0.7097 for organophyllic Wyoming bentonite and organophyllic local bentonite respectively while 80:20 formulations have shown consistency indices of 0.865 and 1 indicating that the drilling muds are shear thinning. 90:20 formulations using organophyllic local sample have shown fluid loss of 14ml however, after soda ash activation with viscosifier treatment, fluid loss of 9ml was recorded. 80:20

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References


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