The Effect of Drillstring Rotation on Equivalent Circulation Density: Modeling and Analysis of Field Measurements

Ahmed, Ramadan; Enfis, Majed Sadeg; Kheir, Hamza Miftah El; Laget, Morten; Saasen, Arild

doi:10.2118/135587-ms

Cited by 49 publications

(21 citation statements)

References 20 publications

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“…The flow state is classified dimensionless Reynold number which is less than 2100 for laminar flow and more than 4000 for turbulent flow. A common friction factor in laminar regime can be describe in (5), and for turbulent regime in (6). A friciton factor of transition regime is calculated using linear regression between larminar and turbulent regime.…”

Section: A No Effect Of Pipe Rotationmentioning

confidence: 99%

“…Ahmed et al [6] introduced the pressure loss ratio (PLR), which is the ratio of pressure loss while pipe rotating at that speed and pressure loss with no pipe rotation, from field measurements with dimensionless analysis expressed in (15 where is yield stress, is eccentric value, is Taylor number, and is effective Reynolds number. The default values and calculation details are followed given references.…”

Section: Ifmentioning

confidence: 99%

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Simulation of Drilling Pressure Profile in Directional Drilling and User Program Development

Panichaporn¹,

Prurapark²,

Siemanond³

2015

IJMMM

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Abstract-Maintaining wellbore stability is challenging in any drilling situation, especially when directional drilling with narrow pressure window are experienced. An imperative parameter to control wellbore stability is downhole pressure or equivalent circulating density (ECD). An accurate downhole pressure is required in order to maintain it in pressure window and also avoid drilling problems which cause interruption during drilling operation, resulting in high non-productive time. Since annular frictional pressure loss increases ECD, it becomes very challenging to estimate accurate annular pressure loss. Many experimental studies have been developed annular pressure loss prediction without validating results with field measurements. This study aims to estimate an annular pressure loss in directional drilling with or without pipe rotation using several developed models with casing program. The performance of the models are tested by comparing the results with field measurements obtained from Kam Phaeng San Basin, Thailand. The conventional annular frictional pressure loss combined with increasing-pressure-loss model gives a good agreement with field measurements, a pipe rotation effect is more influential on annular pressure loss especially in smaller annular space. In addition, a user-friendly software is also developed using MATLAB platform to predict real time downhole pressure and ECD with casing program.Index Terms-Downhole pressure, annular pressure loss, equivalent circulating density (ECD), directional drilling.

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Section: A No Effect Of Pipe Rotationmentioning

confidence: 99%

Section: Ifmentioning

confidence: 99%

Simulation of Drilling Pressure Profile in Directional Drilling and User Program Development

Panichaporn¹,

Prurapark²,

Siemanond³

2015

IJMMM

View full text Add to dashboard Cite

show abstract

“…As a result, the downhole pressures may lead to overestimation or underestimation of the swab/surge effects (Ahmed, et, al., 2010).…”

Section: Introductionmentioning

confidence: 99%

Down Hole Pressure Variation Due to Axial Stick Slip Motion Effect on Drill String

Zhao¹,

Sangesland²

2015

SPE Production and Operations Symposium

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In order to predict downhole surge and swab pressure variation due to movement of the drill pipe, the Stribeck friction model has been outlined to analysis the friction induced stick slip motion in inclined bore holes. This model describes the axial stick slip motion of the drill string through four regimes of contact including sticking, boundary lubrication, partial fluid lubrication and full lubrication. The results from the single degree of freedom (dof) model are compared with the Coulomb friction model. The results indicate significant increase in peak velocity of the lower part of the drill string and Bottom Hole Assembly (BHA) compared to the velocity of the drillstring at surface, i.e., during drill pipe connection using a MODU (Mobile Offshore Drilling Unit). Simulations also show that the wave form of the downhole drill string motion will be different compared to the surface motion due to the stick phase caused by variation of contact force between the drillstring and the borehole in the curved section of the bore hole. In long high deviated boreholes, the movement of the BHA and the corresponding surge and swab pressure during drill pipe connection will be low or negligible due to high drag force and elasticity of the drill string.

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“…In the following sections, several of these attempts are reviewed and arguments are presented showing that prediction is not straightforward. The review is based on a thorough review by Ahmed et al [1].…”

Section: Introductionmentioning

confidence: 99%

Annular Frictional Pressure Losses During Drilling—Predicting the Effect of Drillstring Rotation

Saasen

2014

Journal of Energy Resources Technology

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Controlling the annular frictional pressure losses is important in order to drill safely with overpressure without fracturing the for mation. To predict these pressure losses, however, is not straight forward. First of all, the pressure losses depend on the annulus eccentricity. Moving the drillstring to the wall generates a wider flow channel in part of the annulus which reduces the frictional pressure losses significantly. The drillstring motion itself also affects the pressure loss significantly. The drillstring rotation, even for fairly small rotation rates, creates unstable flow and sometimes turbulence in the annulus even without axial flow.Transversal motion o f the drillstring creates vortices that destabi lize the flow. Consequently, the annular frictional pressure loss is increased even though the drilling fluid becomes thinner because of added shear rate. Naturally, the rheological properties of the drilling fluid play an important role. These rheological properties include more properties than the viscosity as measured by API procedures. It is impossible to use the same frictional pressure loss model for water based and oil based drilling fluids even if their viscosity profile is equal because o f the different ways these fluids build viscosity. Water based drilling fluids are normally constructed as a polymer solution while the oil based are combi nations o f emulsions and dispersions. Furthermore, within both water based and oil based drilling fluids there are functional dif ferences. These differences may be sufficiently large to require different models for two water based drilling fluids built with dif ferent types of polymers. In addition to these phenomena washouts and tool joints will create localised pressure losses. These local ised pressure losses will again be coupled with the rheological properties of the drilling fluids. In this paper, all the above men tioned phenomena and their consequences for annular pressure losses will be discussed in detail. North Sea field data is used as an example. It is not straightforward to build general annular pressure loss models. This argument is based on flow stability analysis and the consequences o f using drilling fluids with differ ent rheological properties. These different rheological properties include shear dependent viscosity, elongational viscosity and other viscoelastic properties.

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The Effect of Drillstring Rotation on Equivalent Circulation Density: Modeling and Analysis of Field Measurements

Cited by 49 publications

References 20 publications

Simulation of Drilling Pressure Profile in Directional Drilling and User Program Development

Simulation of Drilling Pressure Profile in Directional Drilling and User Program Development

Down Hole Pressure Variation Due to Axial Stick Slip Motion Effect on Drill String

Annular Frictional Pressure Losses During Drilling—Predicting the Effect of Drillstring Rotation

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