...-pipe test-sections. Frictional pressure loss data was obtained from each section simultaneously. Flow rate, density and temperature data were obtained using a Coriolis flow meter. It was observed that the toroidal geometry results in secondary flow due to the centrifugal forces. Therefore, elevated...

... Abstract Managing drilling margins in challenging wells requires precise prediction of frictional pressure losses and equivalent circulating density (ECD). Current hydraulic models in the industry fail to accurately predict the frictional pressure losses of certain mud formulations in turbulent...

... downhole conditions with a gas influx entering the wellbore. The data experimental analysis was coupled with the effect of pipe rotation through the application of correlations. The correlations from literature show a change in the expected frictional pressure loss when comparing the rotating case...

... Abstract Annulus frictional pressure losses can be significant in certain application and should be considered in the planning phase to correctly calculate a meaningful safety margin for kick tolerance. Kick tolerance is an integral part of the well construction workflow. The formation, casing...

... results confirm that the annular frictional pressure loss in a fully eccentric annulus are significantly lesser than the values predicted by using models available in the literature for concentric annulus. CFD model includes realistic conditions like eccentric annulus and flow velocities. CFD model...

... pressure loss in a fully eccentric annulus is significantly less than the values predicted by the Narrow Slot approach, sometimes by more than 50%. In general, all the evaluated models underestimated the effect of drillpipe eccentricity on annular frictional pressure loss. However, by comparison, the newly...

... measurement equipment on surface. Frictional pressure loss is recorded at several flow rates, preferably while ramping up pump rates after making connections, and parameters associated with two- and three-parameter rheological models (e.g. the n, K and τ o parameters of the Yield Power Law (YPL) also known...

... the overall well construction phase to improve the performance of future wells. Upstream Oil & Gas well control BHP annular pressure drilling mud density SBP application pressure loss frictional pressure loss Argentina MPCD Implementation Neuquen Basin drilling operation annular...

... estimation of frictional pressure loss in the annulus is essential, especially for multilateral, extended reach and slim hole drilling applications usually encountered in shale gas and/or oil drilling. First, flow state should be determined in order to predict the pressure losses. The flow in the annulus...

... the torque acting on the drillstring as a result of contact forces. A linear temperature gradient for the formation and a constant borehole wall temperature has been assumed to simplify the model. Frictional pressure losses in the drill pipe, in the annulus, and across the bit have been incorporated...

... frictional pressure loss has motivated new researches on this subject. Drillpipe rotation has a mixed effect on the annular pressure loss. Several studies 2 , 4 - 6 , 11 , 17 reported the reduction of pressure loss due to drillstring rotation. Nonetheless, other studies 3 - 13 , 19 reported...

... open hole position, with accurate automatic pressure control in wells were margins are very small, smaller than frictional pressure losses added when circulating at drilling rate. This paper focuses in particular on the use of an advanced transient model for automatic choke regulation. Other aspects...

..., and by weighing cuttings flushed out of the flow loop. Test parameters recorded during the experiments were: liquid and gas injection rates, cuttings weight in injection and removal towers, mixture density, friction pressure loss, pressure and temperature in the annulus. Two flow patterns, stationary cuttings...

... Abstract Maintaining optimum circulation rates is important in aerated mud drilling operations. However, reliable predictions of the optimum rates require accurate modeling of the frictional pressure loss at bottom-hole conditions. This paper presents a mechanistic model for underbalanced...

... in this study. Results from each of the three approaches are compared with experimental and field data. The differences between the calculated and measured bottom-hole pressures (hence ECD) are within a range of about ±8%. In terms of the frictional pressure losses in the annulus, this range increases to about...

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