The effect of well path, tortuosity and drillstring design on the transmission of axial and torsional vibrations from the bit and mitigation control strategies [PDF]
, 2018 As well designs become increasingly complicated, a complete understanding of drillstring vibrations is key to maximize drilling efficiency, to reduce drillstring dysfunction and to minimize drillstring, tool, and borehole damage.
Shor, Roman J.
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The validation of metaphors [PDF]
, 1998 In this paper we introduce models as metaphors for the description of reality We consider a number of case studies of contemporary research pollution of the NorthSea the ow eld of theWadden Sea drillstring dynamics the use of metaphors in ...
Verhulst, F.
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, 2016 International audienceThis paper presents a robustness result for the use of a previously developed adaptive output-feedback controller designed for a pure wave PDE.
Bresch-Pietri, Delphine +3 more
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Optimizating Drilling Operating Parameters With Real-Time Surveillance and Mitigation System of Downhole Vibration in Deep Wells [PDF]
, 2015 Torsional vibration is the main bottleneck which leads to low efficiency of rock breaking. According to the characteristics of torsional dysfunctions performance, the paper defines three main types of stick-slip, and analyzed the relationship between ROP
CHEN, Zhixue +4 more
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Contact Dynamics of a Rotary Drillstring System in Elliptical Wellbores
MachinesAs drilling depths continue to increase in oil and gas operations, the associated downhole environment has grown more complex. Data from recent field measurements reveals significant differences between the major and minor axes of the wellbore cross ...
Haiquan Li +5 more
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Influence mechanism of the rubbing of drilling pipe for the stability of hole wall [PDF]
, 2016 The hole wall appears because of the gas drainage of the coal seam, the hole wall is divided for the elastic area and plastic area, according to the elastic mechanics and rock mechanics established borehole wall stress model, caused by gas drilling ...
Chen-xu, L. (LUO) +2 more
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Asymptotic Stabilization of the Oilwell Drillstring Torsional and Axial Vibrations
MathematicsThe paper starts from the distributed parameter models for both torsional and axial vibrations of the oilwell drillstring. While integrating several accepted features, the considered models are deduced following the Hamilton variational principle in the distributed parameter case.
Daniela Danciu, Vladimir Răsvan
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Hydromechanical method of control of drillstring torsional vibrations
Journal of Physics: Conference Series, 2020 Abstract The article discusses issues related to the vibrations of drillstring (DS). The relevance of the fight against torsional fluctuations DS and the reasons for their occurrence are analyzed. The hydromechanical method of control of torsional oscillations DS and device for its implementation is proposed. This method is characterized
K, A Bashmur +6 more
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Drill-String Vibration Suppression Using Hybrid Magnetorheological Elastomer-Fluid Absorbers
ActuatorsRotary drilling systems with PDC bits, commonly used for drilling deep wells in the production and exploration of oil and natural gas, frequently encounter severe vibrations.
Jasem M. Kamel +2 more
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Комп'ютерне моделювання коливань кружляння доліт бурильних колон у глибоких свердловинах [PDF]
, 2013 У статті розглянуто задачу комп’ютерного моделювання коливань кружляння долота бурильної колони, що обертається, в умовах його фрикційної взаємодії з поверхнею вибою свердловини, проаналізовано механізм можливого чистого кочення без ковзання та обертання
Гайдайчук, В. В. +2 more
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