File Name: theory and application of drilling fluid hydraulics .zip
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In geotechnical engineering , drilling fluid , also called drilling mud , is used to aid the drilling of boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration drilling rigs , drilling fluids are also used for much simpler boreholes, such as water wells. One of the functions of drilling mud is to carry cuttings out of the hole. The three main categories of drilling fluids are: water-based muds WBs , which can be dispersed and non-dispersed; non-aqueous muds, usually called oil-based muds OBs ; and gaseous drilling fluid, in which a wide range of gases can be used. Along with their formatives, these are used along with appropriate polymer and clay additives for drilling various oil and gas formations. The main functions of drilling fluids include providing hydrostatic pressure to prevent formation fluids from entering into the well bore, keeping the drill bit cool and clean during drilling, carrying out drill cuttings, and suspending the drill cuttings while drilling is paused and when the drilling assembly is brought in and out of the hole. The drilling fluid used for a particular job is selected to avoid formation damage and to limit corrosion.
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The estimated frictional pressure loss of fluid flow in a pipe is highly dependent on the rheological properties of the fluid. The applied curve fitting method of the viscosity curve will impact the accuracy of the modelled frictional pressure loss. This study evaluates a new approach for application of the power law model previously presented by Saasen and Ytrehus , using dimensionless shear rates, allowing for simpler comparison between fluid characteristics. The modelling approach is based on selecting an appropriate characteristic shear rate for the flow, replacing the consistency index. The curvature exponent is subsequently fitted to the shear rate region of interest. A method for evaluating the accuracy of estimated frictional pressure loss when using the new model of Saasen and Ytrehus is presented. The uncertainty evaluation of the derived model coefficients is based on the estimated probability distribution of the apparent viscosity measurements and error in the model parameter estimation.
Front Matter. Pages i-xi. PDF · Introduction. Alun Whittaker. Pages · Fluid Flow: Principles, Models, & Measurement. Alun Whittaker. Pages · The Drilling.
Previous model analyzed the following two constraint conditions, drilling pump rated pressure and rated power. In this study, three cases of HERL model are proposed according to the relationship between allowable range of drilling fluid flow rate and rated flow rate of drilling pump Q r. Furthermore, L h1 first increases and then decreases with the increase in drilling fluid flow rate, while L h2 keeps decreasing as the drilling fluid flow rate increases.
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