An Instrumented Bit: A Necessary Step to the Intelligent BHA

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.

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“…Apart from the mathematical models, field tests on the stick–slip and whirl were also carried out by many researchers. 2,81,83–85…”

Section: Stick–slip Vibration Coupling 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

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“…As depicted in these figures, stick-slip oscillations are accompanied by a decrease of the mean side (or lateral) acceleration. These data have been recorded downhole using the instrumented bit developed by Security-DBS (Lesseultre and Lamine 1998). Pragmatically in the field, it is sometimes necessary to pull the bit off-bottom in order to arrest the torsional vibrations (Brett 1992).…”

Section: Field and Laboratory Observationsmentioning

confidence: 99%

Influence of bit-rock interaction on stick-slip vibrations of PDC bits

Richard¹,

Detournay²,

Fear³

et al. 2002

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper describes a new approach to understand the causes of stick-slip vibrations experienced by PDC bits. This new model takes into consideration not only the axial and torsional modes of vibration, but also the coupling between these two modes through bit-rock interaction laws, which are consistent with laboratory results from single cutter experiments. These interaction laws, which account for both frictional contact and cutting processes at the bit-rock interface, are formulated in terms of the depth of cut, a variable that brings into the equations the position of the bit at a previous a priori unknown time. They also account for potential loss of frictional contact between the wear-flats and the rock. The delayed and coupled nature of this interaction is ultimately responsible for the occurrence of self-excited vibrations, which can degenerate into stick-slip oscillations under certain conditions. The features of the torsional vibrations that are predicted with this model are well in accordance with field observations. Furthermore, the results reveal that the model predicts apparent rate effects as an inherent outcome of the nature of the bit-rock interface.

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“…For this purpose, various tools have been developed for measuring downhole drilling parameters. [1][2][3][4][5][6] By subtracting buoyancy from measured data, the value can meet the accuracy requirement of WOB on the well site. 3 H Zhang and colleagues [4][5][6] conducted measuring error analysis, sensor characteristic analysis, and surface calibrating system calibration.…”

Section: Introductionmentioning

confidence: 99%

A study on weight-on-bit data correction method of a near-bit measuring tool

Meng

Liu³

et al. 2019

Advances in Mechanical Engineering

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The real weight on bit is difficult to observe or estimate in highly deviated wells and extended-reach wells since complex loads are acted on drill string. Near-bit measurement while drilling tools, which are generally used to address this issue, can only measure axial forces based on axial strains instead of the real WOB. Axial forces on near-bit drill string are mainly controlled by buoyancy force of drilling fluid, circulating pressure, and other factors. To some extent, the measured data can be corrected by force analysis. It should be noted that experiments must be conducted to study the influences of differential pressure and temperature on measured WOB data of near-bit measuring tool. This article presents calculating method of real WOB via correction of measured data, based on force analysis of a self-developed near-bit measuring tool and experiments on influences of differential pressure and downhole temperature. Field test indicates that higher deviation angle will lead to a greater difference between real WOB and the indicated value at wellhead. Multi-well testing data verification indicates that this method is effective and reliable in extracting real WOB, and helpful to accurately identify the running state of bottom-hole assembly.

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An Instrumented Bit: A Necessary Step to the Intelligent BHA

Cited by 14 publications

References 0 publications

Stick–slip vibrations in oil well drillstring: A review

Stick–slip vibrations in oil well drillstring: A review

Influence of bit-rock interaction on stick-slip vibrations of PDC bits

A study on weight-on-bit data correction method of a near-bit measuring tool

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