Annular Pressure Loss Predictions for Various Stand-off Devices

Yao, Dongping; Samuel, Robello

doi:10.2118/112544-ms

Cited by 6 publications

(3 citation statements)

References 4 publications

(2 reference statements)

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“…There are three possibilities to account for this complex phenomenon: Use an empirical model based on relevant experimental data, develop a physical law that uses statistical physics methods, or synthetize the results of many simulations made with a detailed computational-fluid-dynamics (CFD) model of the problem, similar to the work performed on annular pressure loss around stabilizers presented by Yao and Robello (2008). In a first approach, we have chosen a method that is based on empirical correlations because of readily available results.…”

Section: Cuttings In Suspensionmentioning

confidence: 99%

Real-Time Evaluation of Hole-Cleaning Conditions With a Transient Cuttings-Transport Model

Cayeux

Mesagan

Tanripada

et al. 2014

SPE Drilling &Amp; Completion

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During a drilling operation, a real-time analysis of surface and downhole measurements can give indications of poor hole cleaning. However, it is not always intuitive to understand how and where the cuttings are settling in the borehole because the transportation of cuttings and the formation of cuttings beds are largely influenced by the series of actions performed during the operation. With a transient cuttings-transport model, it is possible to get a continuously updated prognosis of the distribution of cuttings in suspension and in beds along the annulus. This information can be of prime importance for making decisions to deal with and prevent poor hole-cleaning conditions.A transient cuttings-transport model has been obtained by integrating closure laws for cuttings transport into a transient drilling model that accounts for both fluid transport and drillstring mechanics.This paper presents how this model was used to monitor two different drilling operations in the North Sea: one using conventional drilling and one using managed-pressure drilling (MPD). Some unknown parameters within the model (e.g., the size of the cuttings particles) were calibrated to obtain a better match with the top-side measurements (cuttings-flow rate, active pit reduction as a result of cuttings removal). With the calibrated model, the prediction of cuttings-bed locations was confirmed by actual drilling incidents such as packoffs and overpulls while tripping out of hole.On the basis of the calibrated transient cuttings-transport model, it is thereby possible to evaluate the adjustments of the drilling parameters that are necessary to stop and possibly remove the cuttings beds, thus giving the drilling team the opportunity to take remedial and preventive actions on the basis of quantitative evaluations, rather than solely on the intuition and experience of the decision makers. IntroductionDuring drilling operations, ensuring proper hole-cleaning conditions is extremely important. Otherwise, serious drilling problems can occur such as stuck-pipe incidents or packoff situations, which can lead to the fracturing of the formation and resulting mud losses. The end result of poor cuttings transport is an increase in nonproductive time. To predict how cuttings are transported, there has been performed a vast amount of experimental work and different attempts on developing appropriate cuttings-transport models. An overview of some of the work that has been performed is given by Pilehvari et al. (1999). It has turned out to be quite complex to describe the cuttings-transport process because transport is influenced by many different parameters such as wellbore geometry, inclination, fluid density, rheology, rate of penetration (ROP), drillstring rotation, flow patterns, flow rate, and cuttings size. One could divide the modeling approach into two

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Section: Cuttings In Suspensionmentioning

confidence: 99%

Real-Time Evaluation of Hole-Cleaning Conditions With a Transient Cuttings-Transport Model

Cayeux

Mesagan

Tanripada

et al. 2014

SPE Drilling &Amp; Completion

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“…One of those devices is the stand-off device (SOD), which can include centralizers, stabilizers, reamers, turbulators, and friction reduction devices (Samuel, 2008). Increased oil demand has led to increases in the number of wells drilled each year, as well as to the depth of the wells.…”

Section: Introductionmentioning

confidence: 99%

“…Tthe case of concentric drill pipe and casing analysis has been done by Yao and Samuel, 2008 and the effect of eccentricity and pipe rotation was not considered. These centralizers are fitted with a hinged collar to maintain the casing or liner in the center of the wellbore.…”

Section: Introductionmentioning

confidence: 99%

Effect of Eccentricity and Rotation on Annular Frictional Pressure Losses With Standoff Devices

Singh

Samuel

2009

All Days

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Pressure drop estimates are critical for components of the drilling process. During drilling and cementing operations, many stand-off devices, such as centralizers, reamers, and turbulators, are widely used. Few studies have explored the pressure losses arising from these attached devices in the drillstring or casing string with eccentricity and rotation, and these pressure losses are assumed to be negligible. Eccentricity between the wellbore and the stand-off devices, rotation, and the complicated geometrical designs of these devices, which relatively irregular and complicated, increase the complexity of the frictional pressure loss calculations. This study examines the effect of the various geometrical parameters of the commonly used devices, eccentricity, and rotation of the devices, flow rate, and rheological properties on the annular pressure loss using c computational fluid dynamics (CFD). For laminar flow, the 3D Navier-Stokes equation is used. The turbulent flow is based on k-ω model. This paper presents the results of the study of the alteration and effects of various rheology models on the flow profile and annular pressure losses. This parametric study explores the importance of eccentricity and device rotation and presents a simple set of comprehensive equations and guidelines to calculate the pressure losses for commonly used devices. These equations and guidelines are useful in the determination of the number of devices and of their optimum placement in the string. Although the annular pressure loss against these devices may be negligible, at times incremental pressures from the large number of stand-off devices or in a narrow clearance extended reach wells are potentially detrimental to the well. This paper also presents case studies in which the pressure losses were not negligible and stresses the importance of considering the pressure losses encountered using these devices.

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Characteristics of helical flow in slim holes and calculation of hydraulics for ultra-deep wells

Yang²,

Chen

et al. 2010

Pet. Sci.

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Due to the slim hole at the lower part of the ultra-deep and deep wells, the eccentricity and rotation of drill string and drilling fl uid properties have great effects on the annular pressure drop. This leads to the fact that conventional computational models for predicting circulating pressure drop are inapplicable to hydraulics design of deep wells. With the adoption of helical flow theory and H-B rheological model, a computational model of velocity and pressure drop of non-Newtonian fluid flow in the eccentric annulus was established for the cases where the drill string rotates. The effects of eccentricity, rotation of the drill string and the dimensions of annulus on pressure drop in the annulus were analyzed. Drilling hydraulics was given for an ultra-deep well. The results show that the annular pressure drop decreases with an increase in eccentricity and rotary speed, and increases with a decrease in annular fl ow area. There is a great difference between static mud density and equivalent circulating density during deep well drilling.

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Annular Pressure Loss Predictions for Various Stand-off Devices

Cited by 6 publications

References 4 publications

Real-Time Evaluation of Hole-Cleaning Conditions With a Transient Cuttings-Transport Model

Real-Time Evaluation of Hole-Cleaning Conditions With a Transient Cuttings-Transport Model

Effect of Eccentricity and Rotation on Annular Frictional Pressure Losses With Standoff Devices

Characteristics of helical flow in slim holes and calculation of hydraulics for ultra-deep wells

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