A comparative review of modelling and controlling torsional vibrations and experimentation using laboratory setups

Patil, Parimal Arjun; Teodoriu, Cătălin

doi:10.1016/j.petrol.2013.11.008

Cited by 60 publications

(33 citation statements)

References 42 publications

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“…In the field, a control strategy, which tries to maintain the speed constant, is applied to the top drive. A PID-control law is commonly used, but there are different torsional control strategies found in the literature [10]. If the control is able to keep an almost constant speed at the top, our modeling is representative.…”

Section: Bha Bitmentioning

confidence: 99%

Hysteretic bit/rock interaction model to analyze the torsional dynamics of a drill string

Real

Batou

Ritto

et al. 2018

Mechanical Systems and Signal Processing

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The present paper proposes a novel hysteretic (non-reversible) bit/rock interaction model for the torsional dynamics of a drill string. Non-reversible means that the torque-on-bit depends not only on the bit speed, but also on the bit acceleration, producing a type of hysteretic cycle. The continuous drill string system is discretized by means of the finite element method and a reduced-order model is constructed using the normal modes of the associated conservative system. The parameters of the proposed hysteretic bit/rock interaction model is fitted with field data. The non-linear torsional vibration and the stability map of the drill string system are analyzed employing the proposed bit/rock interaction model and also a commonly used reversible model (without hysteresis). It turns out that the hysteretic model affects the stability region of the system.

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Section: Bha Bitmentioning

confidence: 99%

Hysteretic bit/rock interaction model to analyze the torsional dynamics of a drill string

Real

Batou

Ritto

et al. 2018

Mechanical Systems and Signal Processing

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“…Several researchers have developed models and carried out lab scaled experiments along with field data comparison , Dykstra et al 1994, Jogi et al 2002, Bailey et al 2008, Patil and Teodoriu 2013b. Most of the lab scaled setup do not actually drill rock but only imitate the process.…”

Section: Problem Statementmentioning

confidence: 99%

“…2.11). Patil and Teodoriu (2013b) designed a downscaled laboratory setup using law of similitude to study the effect of rotational speed, WOB, string length, string stiffness and inertia on the torsional vibration. Most of the field measurement deals with resonant frequencies and comparison of vibration amplitudes and frequencies.…”

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

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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.

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“…Recently several attempts have been made to replicate these vibrations in academic laboratories. However, in most studies the cutting process is simulated by a friction between two disks [3].…”

Section: Introductionmentioning

confidence: 99%

Suppression of Drill-String Stick-Slip Vibration

2018

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Abstract. 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 drilling rig developed at the University of Aberdeen [1] and using PDC commercial drill-bits and real rock-samples. A mathematical model of the experimental setup which takes into account the dynamics of the drill-string and the driving motor, is proposed. Then a sliding mode control method is employed to suppress stick-slip oscillations. The experimental and numerical results considering a time delay of the actuator are in a close agreement. Stick-slip vibration is eliminated and significant reduction in vibration amplitude has been observed when using the controller.

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A comparative review of modelling and controlling torsional vibrations and experimentation using laboratory setups

Cited by 60 publications

References 42 publications

Hysteretic bit/rock interaction model to analyze the torsional dynamics of a drill string

Hysteretic bit/rock interaction model to analyze the torsional dynamics of a drill string

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

Suppression of Drill-String Stick-Slip Vibration

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