Rheological Study of Formate (Nacl) and Ethylene Glycol Based Drilling Fluid Using MATLAB

Bilal Sabiu, A. Bello, H.A. Adebisi
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Abstract

Non-Newtonian models are used in describing the rheology of drilling fluids. Models, such as Power Law, Bingham Plastic, and the Hershel-Buckley model are used to predict drilling fluid behaviour. Selection of the best rheological model that accurately represents the shear stress-shear rate data is optimal in determining fluid use and predicting realistic rheological behaviour. This research is aimed at studying the best rheology model to fit collected data from sodium chloride (NaCl) and ethylene glycol (EG) based drilling fluid. The assessment utilized a total of ten sets of experimental viscometry data from laboratory-formulated drilling fluid samples A to J with the varying volume of formate sodium chloride (NaCl) and ethylene glycol (EG). Using Equations relating shear rates to shear stress, MATLAB non-linear regression approach was used to determine the best of the three rheological models to fit the experimental. The Root square (R2), Adjusted Root square (Adj R2), and Root Mean Square Error (RMSE) were used in determining the goodness of fit and degree of deviation of the experimental data. data. High concentrations of both NaCl and ethylene glycols in the formulation provide a better shear rate shear stress fit. Although the ethylene glycol presence may have account for the improved fit, as Sample E, F and G despite containing high volume of the formate NaCl, the data where not effectively fitted by the models. From the results, the power law model was the least suitable with an R2 value of 0.881-0.956, Adj R2 83-96%, and a poor RSME in the range 2-9. The Herschel-Bulkley model showed an improved fit for the fluids with an R2 0.897-0.973, Adj R287- 98%, and a better RSME <3. this model also shows a good shear thinning behaviour from its three parameter consistency (n) index values. The Bingham plastic model best fits the rheology of the drilling fluid data R2 0.93-0.99, Adj R2 93-98%, and RSME of <2.
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基于MATLAB的甲酸盐/乙二醇基钻井液流变学研究
非牛顿模型用于描述钻井液的流变性。Power Law、Bingham Plastic和hershell - buckley模型等模型被用于预测钻井液行为。选择能够准确表示剪切应力-剪切速率数据的最佳流变模型是确定流体使用和预测实际流变行为的最佳选择。本研究旨在研究最佳流变性模型,以拟合氯化钠(NaCl)和乙二醇(EG)基钻井液的采集数据。该评估使用了10组实验粘度数据,这些数据来自实验室配制的钻井液样品a到J,其中含有不同体积的甲酸氯化钠(NaCl)和乙二醇(EG)。利用剪切速率与剪切应力的关系方程,利用MATLAB非线性回归方法确定三种流变模型中最适合实验的模型。采用均方根(R2)、校正均方根(Adj R2)和均方根误差(RMSE)来确定实验数据的拟合优度和偏差程度。数据。在配方中加入高浓度的NaCl和乙二醇,可获得较好的剪切速率。虽然乙二醇的存在可能是改善拟合的原因,但样品E、F和G尽管含有大量甲酸盐,但模型不能有效地拟合数据。从结果来看,幂律模型最不适合,R2为0.881 ~ 0.956,Adj R2为83 ~ 96%,RSME较差,在2 ~ 9范围内。Herschel-Bulkley模型对流体的拟合度较好,R2为0.897 ~ 0.973,Adj为R287 ~ 98%, RSME <3。该模型的三个参数一致性(n)指标值也显示出良好的剪切减薄性能。Bingham塑性模型最适合钻井液流变数据R2 0.93 ~ 0.99, Adj R2 93 ~ 98%, RSME <2。
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来源期刊
Songklanakarin Journal of Science and Technology
Songklanakarin Journal of Science and Technology Multidisciplinary-Multidisciplinary
CiteScore
1.10
自引率
0.00%
发文量
0
审稿时长
25 weeks
期刊介绍: Songklanakarin Journal of Science and Technology (SJST) aims to provide an interdisciplinary platform for the dissemination of current knowledge and advances in science and technology. Areas covered include Agricultural and Biological Sciences, Biotechnology and Agro-Industry, Chemistry and Pharmaceutical Sciences, Engineering and Industrial Research, Environmental and Natural Resources, and Physical Sciences and Mathematics. Songklanakarin Journal of Science and Technology publishes original research work, either as full length articles or as short communications, technical articles, and review articles.
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