A New Damping Model for Nonlinear Drillstring Dynamics: Understanding the Effects of Rotation, Eccentricity, and Confined Fluid Flow and Their Impact on Unconventional Drillstring Design

Wilson, J. K.; Noynaert, Samuel F.

doi:10.2118/178817-ms

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…In this section, we include a static model for computing the wellbore annular pressures. Hence, no coupling is included such as the effect of damping of drill string vibrations due to mud flow (see, e.g., Wilson and Noynaert 4 ).…”

Section: Simulation and Resultsmentioning

confidence: 99%

“…The numerical stability dictates the performance during the simulation and accuracy of the results obtained. For second-order models used to represent drill string dynamics, the method by Newmark 28 (see, e.g., Wilson and Noynaert, 4 Butlin and Langley 37 ), Runge–Kutta, and the forward Euler methods 12,38 are among some of the more common integration schemes found in the literature. Nonlinear models comprising contact dynamics and stick-slip behavior may require a relatively short time step ( h ≈ 10 − 4 ) for convergence.…”

Section: Discussionmentioning

confidence: 99%

“…Assumption (3). The wellbore is circular, defined by the diameter d w , with its center on the curve C. Assumption (4). The rotation about the normal and binormal axes of b i is neglected, since the angular displacement about the tangent axes are larger, simplifying the modeling.…”

Section: Wellbore and Drilling System Representationmentioning

confidence: 99%

“…where superscript c denotes the geometric center, i c1 is the unit tangent vector of frame i computed from Equation (3), i c3 is the unit normal vector computed according to Equation (5), i c2 = i c1 3 i c3 is the bi-normal, and j i ; z i , and x i are the magnitudes in each of the directions. The curvature k at s i is then computed according to Equation (4).…”

Section: Kinematicsmentioning

confidence: 99%

“…3 Predicting drill string motion in three-dimensional (3D) directional wells has been researched to some extent during the past years, typically using distributed models or finite element methods (FEM). 4,5 In Aarsnes and Shor, 6 a distributed model of the torsional drill string dynamics for inclined wellbores was presented. Distributed friction was included, and the model was validated toward field data.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Modeling of drill string dynamics in directional wells for real-time simulation

et al. 2023

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Simple and computationally efficient drill string models running real-time describing motion in all axes in directional wells are important for the implementation of closed-loop control and assisted monitoring during drilling operations. This paper proposes a new simplified three-dimensional model based on a parametric curve and lumped-parameter modeling, where Kane’s method is used to establish the equations of motion. Validation of the steady-state motion and convergence for the lumped model in vertical and horizontal alignment was compared with a finite-element model. The configuration and restoring forces show good results compared with finite-element analysis. Hence, the model demonstrate the axial contraction as a function of the body restoring forces being oriented to the inertial frame, inherently producing nonlinear coupled axial tension forces. The qualitative response of the model is confirmed in simulation case studies, being showcased by a deviated J-well configuration. Traveling block velocity and top drive torque are included as actuated inputs to analyze off-bottom friction and contact along the wellbore. The model is proposed to act as a virtual sensor for drilling directional wells.

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Section: Simulation and Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Wellbore and Drilling System Representationmentioning

confidence: 99%

Section: Kinematicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of drill string dynamics in directional wells for real-time simulation

et al. 2023

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Inducing Axial Vibrations in Unconventional Wells: New Insights through Comprehensive Modeling

Wilson

Noynaert

2017

SPE/IADC Drilling Conference and Exhibition

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Axial Excitation Tools, or AETs, are known to help improve ROP in modern horizontal wells. These devices instigate an axial vibration in the drillstring, which then propagates along the length of the horizontal assembly. The improvement in ROP is thought to originate from a more effective WOB transfer due to this induced axial movement from the AET. However, the exact mechanics of how these tools affect the drillstring is not known due to a lack of adequate modeling. Additionally, little work has been done to examine the potential consequences of inducing an axial resonance within the drillstring while utilizing these types of tools. This study explores these questions through advanced dynamic modeling. Using a newly-developed, validated, comprehensive drillstring model, the dynamic response of the drillstring, due to the axial excitation provided by an AET, is examined via a forced-frequency approach. The resulting sensitivity analysis illustrates the dependence of the system on the various operational and structural characteristics of the drillstring. Parameters examined include applied WOB, wellbore trajectory, design characteristics of the AET, and various boundary conditions. Nonlinear time- domain simulations are also conducted in order to quantify how AETs affect the axial force transfer to the bit. It is shown that various operational parameters will have a noticeable impact on the dynamic response of the drillstring when inducing axial vibrations while drilling. This observation suggests the necessity to properly plan for the use of AETs in order to avoid unnecessary failures of downhole components and subsequent non-productive time (NPT). While the modeling itself is advanced, the outputs are designed to help visualize the response of the system in a "user-friendly" manner, reducing the learning curve and bridging the gap between the "tech-savvy" and non-technical personnel. This study presents an efficient way of determining the potential of harmful vibrations when drilling with an Axial Excitation Tool. The modeling approach shown is comprehensive and provides new insights into the fundamental operation of these types of tools and how axial excitations help to improve drilling efficiencies. Results presented show that induced vibrations do not simply "reduce friction," as is so often claimed; instead, these tools generate a dynamic axial force, oscillating about the average value, which may help work past "tight-spots" along the well. In turn, this would give the impression of reduced friction along the wellbore based on hook load measurements.

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Dynamics Vibration Prediction and Comparison with Downhole Data Measurements in Unconventional Wells

Mahjoub¹,

Nguyen²,

Menand³

et al. 2020

IADC/SPE International Drilling Conference and Exhibition

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During drilling operations, high drillstring vibrations may originate from various sources, namely, the bit-rock interaction, drillstring-wellbore contacts, stick-slip phenomena, fluid-structure interaction, and mass unbalances. Excessive vibrations may induce drilling equipment failures (fatigue, cracking, washouts, and ruptures), which can be costly and catastrophic. Therefore, it is crucial to accurately model the drillstring dynamics in order to help drilling engineers make better decisions and avoid harmful vibrational effects. This paper proposes a numerical model developed in the time domain to estimate the drillstring lateral, axial, and torsional dynamics. It is based on the finite element method coupled with the Craig-Bampton reduction method (Craig and Bampton 1968) to reduce computation time. The drillstring-wellbore contact forces are automatically determined and may occur on both tool-joints and drill pipe bodies, and the drilling fluid is accounted for by its inertial and frictional effects. The efficiency, accuracy, and predictive capacities of the model are assessed by comparing the computational results to downhole measurements for a case study of a non-conventional well. A good agreement for both lateral and torsional vibrations is obtained. The numerical results are used for a more detailed analysis on the lateral and torsional vibrations of the system. The evolution of lateral acceleration, from a forward to backward whirling tendency on the system, can then be assessed with the use of a spectral analysis. The novelty of this dynamics model is that it can portray a realistic geometry of a drilling assembly in 3D curved wells with the fluid presence and gives a complete study of the coupling phenomena between the axial, torsional, and lateral vibrations. The use of this novel dynamics model along with downhole data acquisition and wired pipe technology is one of the essential steps towards drilling automation to provide a better mitigation of drillstring vibrations.

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A New Damping Model for Nonlinear Drillstring Dynamics: Understanding the Effects of Rotation, Eccentricity, and Confined Fluid Flow and Their Impact on Unconventional Drillstring Design

Cited by 6 publications

References 21 publications

Modeling of drill string dynamics in directional wells for real-time simulation

Modeling of drill string dynamics in directional wells for real-time simulation

Inducing Axial Vibrations in Unconventional Wells: New Insights through Comprehensive Modeling

Dynamics Vibration Prediction and Comparison with Downhole Data Measurements in Unconventional Wells

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