![]() ![]() Accurate hydraulics estimations are greatly important for managed pressure drilling (MPD) systems. Accurate hydraulics pressure prediction is of great interest in drilling during the planning phase (hydraulics design) and the execution phase for detection and identification of drilling problems in a real-time manner. In most drilling operation, single-phase liquid muds are used (as is focused in this work), whereas multiphase fluids such as aerated muds may be used in some specific situations (Guo et al. The fluid pressure varies widely along the circulation loop including the standpipe, the drill-string, across the bit nozzles and along the annular space. The use of this coefficient removes the necessity of using rather complex mud rheological models such as the Herschel–Bulkley model. The findings also showed that this enhanced effect is independent of the mud type. This is considered a significant contribution to accurate calculation of borehole hydraulics and in-time detection and identification of borehole problems and reduction of invisible lost time. By applying this coefficient, the estimated pressure losses are increased to compensate the under-estimation of the Bingham Plastic model. The results showed that applying a correction coefficient of 1.08–1.12 to turbulent pressure loss equations (depending on borehole size and mud type) improves the pressure loss estimation. ![]() The range of the coefficient was determined in field applications for different hole sizes and mud types. This coefficient encompasses the effects of the drill pipe tool joints and other effects in estimation of pressure losses. In this study, the Bingham Plastic model has been modified by applying a coefficient to its turbulent pressure loss calculations. ![]() Accurate pressure drop estimation is important for drill string and bit nozzles design and optimized fluid circulations as well as identifying the drilling problems such as bit nozzle(s) washout or plugging. ![]()
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