Laboratory investigation of drillstring vibrations

Khulief, Y. A.; Al‐Sulaiman, Fahad A.

doi:10.1243/09544062jmes1550

Cited by 50 publications

(16 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The DDOF model by Canudas-de-Wit et al 23 Kreuzer and Steidl 32 developed a high dimensional drillstring model consisted of 51 elements, one element represents the rotary table, one element represents the BHA, and 49 elements model the string with self-excited stick-slip vibration. The finite element (FE) method was used to model drillstring; however, most of the reported investigations concentrated on investigating the BHA. In order to understand the severe torsional and axial vibrations excited by stick-slip vibration, Khulief et al 33 used Lagrangian method and FE method to derive the motion equation of the rotating drilling system. The drillstring model included both drill-pipes and drill-collars to study the dynamics of the drilling system in the existence of stick-slip vibrations.…”

Section: Mdof Vibration Modelsmentioning

confidence: 99%

Stick–slip vibrations in oil well drillstring: A review

Tang

Guo

Zhu

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

A survey of the literature related to theoretical and experimental studies on stick-slip vibration in oilwell drillstring is carried out in this study. It aims to explain key concepts and present the existing methods for studying this phenomenon. After briefly describing the stick-slip vibration related problems, theoretical models for such phenomenon are discussed including both coupled and uncoupled models. Discussion for experimental investigations including both laboratory and field tests are hereinafter addressed. This study aims to summarize the literature related to the stick-slip vibration, and help researchers in understanding and suppressing such phenomenon.

show abstract

Section: Mdof Vibration Modelsmentioning

confidence: 99%

Stick–slip vibrations in oil well drillstring: A review

Tang

Guo

Zhu

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…Two example rigs are developed in TU Eindhoven and University of Maryland, described in detail in [35,36], respectively. Some other rigs following the same principle are presented in [37,38].…”

Section: Experimental Rigmentioning

confidence: 99%

Suppression of drill-string stick–slip vibration by sliding mode control: Numerical and experimental studies

Vaziri¹,

Kapitaniak²,

Wiercigroch³

2018

Eur. J. Appl. Math

View full text Add to dashboard Cite

We investigate experimentally and numerically suppression of drill-string torsional vibration while drilling by using a sliding mode control. The experiments are conducted on the novel experimental drill-string dynamics rig developed at the University of Aberdeen (Wiercigroch, M., 2010, Modelling and Analysis of BHA and Drill-string Vibrations) and using commercial Polycrystalline Diamond Compact (PDC) drill-bits and rock-samples. A mathematical model of the experimental setup, which takes into account the dynamics of the drill-string and the driving motor, is constructed. Physical parameters of the experimental rig are identified in order to calibrate the mathematical model and consequently to ensure robust predictions and a close agreement between experimental and numerical results for stick–slip vibration is shown. Then, a sliding mode control method is employed to suppress stick–slip vibration. A special attention is paid to prove the Lyapunov stability of the controller in presence of model parameter uncertainties by defining a robust Lyapunov function. Again experimental and numerical results for the control cases are in a close agreement. Stick–slip vibration is eliminated and a significant reduction in vibration amplitude has been observed when using the sliding controller.

show abstract

“…Numerical simulations were carried out and found that the initial string position is important for dynamic analysis of the drillstring. Another setup similar to Berlioz was constructed by Khulief and Al-Sulaiman (2009) with a shaker at the bottom of the brake to excite axial vibrations. The rig could simulate stick-slip, drillstring /wellbore contact and fluid interaction.…”

Section: Previous Studiesmentioning

confidence: 99%

Experimental Investigation of the Effects of Rotational Speed and Weight on Bit on Drillstring Vibrations, Torque and Rate of Penetration

Bavadiya

Alsaihati

Ahmed

et al. 2017

Day 3 Wed, November 15, 2017

View full text Add to dashboard Cite

Drillstring vibrations namely axial, lateral and torsional vibrations are the primary reason for downhole tool failure and reduction in rate of penetration (ROP). Factors like bit design, bottom hole assembly, bit-rock interaction, rotational speed, wellbore hydraulics, weight on bit (WOB) and drillstring-borehole interaction affect vibrations, out of which only rotational speed and WOB can be changed in real-time to minimize vibrations. It has been a topic of interest to understand and model downhole vibrations, minimize them and find an optimum range of drilling parameters to increase the drilling efficiency. This article presents the results of experimental studies conducted on a fully automated drilling rig to examine the effects of drilling parameters on drillstring vibrations, torque and rate of penetration. The study is different in terms of the high-speed range and the use of axial vibration transmitter to measure the vibration severity as per ISO standards. Experiments were performed on two different rock samples with varying strength. Perfect hole cleaning with negligible fluid flow effect was assumed. Each experiment was run for an average of six minutes collecting an average of 120 data points which were then averaged out for analysis. Parametric study was carried out to analyze the impacts of bit strength to rock strength ratio, bit constant and intrinsic specific energy on torque using existing model. As the drillstring was stiff and small, torsional oscillations were not observed and only lateral and axial vibrations were studied. Effect of drilling parameters and vibration on ROP was studied only on soft rock sample as ROP on hard rock was too small to be recorded Once the input parameters for the analytic model were methodically selected they show good agreement with the experimental data. The results of the parametric study revealed that estimation of torque relies heavily on the bit constant. Axial vibrations increased when rotational speed was near to the natural frequency of the drillstring which resulted in increase of ROP. Type of formation affected the magnitude of lateral and axial vibrations. Reducing both rotational speed and WOB helps to minimize lateral vibrations in hard formations while reducing rotational speed can effectively reduce axial vibrations.

show abstract

Laboratory investigation of drillstring vibrations

Cited by 50 publications

References 26 publications

Stick–slip vibrations in oil well drillstring: A review

Stick–slip vibrations in oil well drillstring: A review

Suppression of drill-string stick–slip vibration by sliding mode control: Numerical and experimental studies

Experimental Investigation of the Effects of Rotational Speed and Weight on Bit on Drillstring Vibrations, Torque and Rate of Penetration

Contact Info

Product

Resources

About