Model Development of Torsional Drillstring and Investigating Parametrically the Stick-Slips Influencing Factors

Patil, Parimal Arjun; Teodoriu, Cătălin

doi:10.1115/1.4007915

Cited by 31 publications

(9 citation statements)

References 25 publications

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“…is the weight on the bit, is the bit radius, represents the rotational direction; and µ ( ) is the bit dry friction, which follows the Karnopp friction model, and it is given in (8).…”

Section: Stick-slip Vibrationsmentioning

confidence: 99%

“…Lumped-parameter model with multiple degrees of freedom (DOFs) has been an interesting research topic for many researchers; Patil and Teodoriu [8] investigated the effect of weight on bit (WOB), rotary velocity, and drillstring stiffness on the stick-slip severity. Navarro-Lopez et al [9] conducted a study on the influence of slip motion on the drilling system by developing a more generic lumped-parameter model that takes into account the increase in drillstring length.…”

Section: Introductionmentioning

confidence: 99%

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Drill Bit Deformations in Rotary Drilling Systems under Large-Amplitude Stick-Slip Vibrations

et al. 2020

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In oil and gas industry, rotary drilling systems are used for energy exploration and productions. These types of systems are composed of two main parts: mechanical and electrical parts. The electrical part is represented by rotating motor called top drive; however, the mechanical part of the system is composed of tool string with many pipes, at the bottom end of these pipes the bit is attached to cut the rock during their contact. Since the bit is in a direct contact with rock characteristic variations, it can be under risk for heavy damage. The latter is principally caused by the fact that the rock–bit interaction term is highly nonlinear and unpredictable. In literature, many mathematical models have been proposed for rock–bit interaction, but they do not reflect the dynamic of the bit under vibrations since torsional and axial vibrations are strongly coupled and synchronized with it. In industrial development, the design of drill bit has faced many improvements in order to overcome these vibrations and mitigate unpredictable phenomena. Even though, the practical use of these drill bits confirmed that there are still many failures and damages for the new designs; moreover, bits’ virtual life become shorter than before. The objective of this study is to analyze the drill bit deformations caused by the stick-slip vibration phenomenon which is characterized by high-frequency high-amplitude in rotary drilling systems. The obtained results were validated through a case study of MWD (measurement while drilling) data of well located in a Southern Algerian oil field.

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“…is the weight on the bit, is the bit radius, represents the rotational direction; and µ ( ) is the bit dry friction, which follows the Karnopp friction model, and it is given in (8).…”

Section: Stick-slip Vibrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drill Bit Deformations in Rotary Drilling Systems under Large-Amplitude Stick-Slip Vibrations

et al. 2020

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“…During drilling, the vibration of drill string in borehole mainly includes axial vibration, torsional vibration, and lateral vibration. The axial vibration is the bit-bounce, torsional vibration shows stick-slip vibration, lateral vibration is the collision between the bit and wellbore [1][2][3][4][5]. Because the contact force between bit and bottom hole is coupled to the friction between drill string and borehole, the interaction between drill string and borehole is highly nonlinear.…”

Section: Introductionmentioning

confidence: 99%

An Improved Model to Characterize Drill-String Vibrations in Rotary Drilling Applications

Wang¹,

Ni²,

Wang³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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A specific model is elaborated for stick-slip and bit-bounce vibrations, which are dangerous dynamic phenomena typically encountered in the context of rotary drilling applications. Such a model takes into account two coupled degrees of freedom of drill-string vibrations. Moreover, it assumes a state-dependent time delay and a viscous damping for both the axial and torsional vibrations and relies on a sawtooth function to account for the cutting force fluctuation. In the frame of this theoretical approach, the influence of rock brittleness on the stability of the drill string is calculated via direct integration of the model equations. The results show that the rock brittleness has a great influence on the rotational speed and bit depth.

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“…In the process of oil field development and oil and gas reservoir exploration, drilling is a project with high-cost and high-risk characteristics. Researchers have discovered one of the factors affecting the low drilling efficiency when the harmful vibration of the drill string occurs downhole [1][2][3][4][5][6][7], which is also one of the reasons for the increase in drilling costs [8][9][10]. In order to control drilling costs and improve drilling efficiency, drill string vibration has become a long-term focus of researchers in the drilling industry [11,12].…”

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Downhole Drill String Vibration Signal

Wang

Shan

et al. 2021

Applied Sciences

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Downhole drill string vibration data can provide an effective reference for research drill string vibration during drilling. In this paper, the research group used a storage-type downhole vibration measurement equipment equipped with an orthogonal, three-axis accelerometer to measure and collect drill string vibration signals during drilling in an oil well. Based on the installation characteristics of the sensor, the relationship between the acceleration measurement value of the sensor and the center acceleration value of the drill string is obtained. Then the time-domain signals representative of the vibration in igneous rock drilling is analyzed. It can be found that the occurrence of stick-slip vibration can be judged by the regular wave packets in the time-domain signal, while the time-domain signal of whirl is disorderly. The main frequency of stick-slip vibration in the low-frequency band is 0.1221 Hz and the period of stick-slip vibration is very close to 10 s through Fast Fourier (FFT) and Short-time Fourier transform (DTFT) methods. In the process of whirling, two frequencies, respectively, 0.05341 Hz and 155.5 Hz, play a major role. The frequency 0.05341 Hz is very close to the reciprocal of the period of 20 s when the peak energy spectrum density appears, indicating that the occurrence of whirl is very likely to be related to the natural frequency of the drilling tool. Through further time-frequency analysis, it also can be found that the occurrence of whirl and stick-slip is greatly related to the use of torsional impactors and jars.

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Model Development of Torsional Drillstring and Investigating Parametrically the Stick-Slips Influencing Factors

Cited by 31 publications

References 25 publications

Drill Bit Deformations in Rotary Drilling Systems under Large-Amplitude Stick-Slip Vibrations

Drill Bit Deformations in Rotary Drilling Systems under Large-Amplitude Stick-Slip Vibrations

An Improved Model to Characterize Drill-String Vibrations in Rotary Drilling Applications

Measurement and Analysis of Downhole Drill String Vibration Signal

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