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钻柱中粘滑振动的数值与实验研究。

Numerical and experimental studies of stick-slip oscillations in drill-strings.

作者信息

Liu Yang, Páez Chávez Joseph, De Sa Rulston, Walker Scott

机构信息

1College of Engineering Mathematics and Physical Sciences, University of Exeter, Rennes Drive, Exeter, EX4 4RN UK.

2Faculty of Natural Sciences and Mathematics, Center for Applied Dynamical Systems and Computational Methods (CADSCOM), Escuela Superior Politécnica del Litoral, P.O. Box 09-01-5863, Guayaquil, Ecuador.

出版信息

Nonlinear Dyn. 2017;90(4):2959-2978. doi: 10.1007/s11071-017-3855-9. Epub 2017 Oct 31.

DOI:10.1007/s11071-017-3855-9
PMID:32009736
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6959376/
Abstract

The cyclic nature of the stick-slip phenomenon may cause catastrophic failures in drill-strings or at the very least could lead to the wear of expensive equipment. Therefore, it is important to study the drilling parameters which can lead to stick-slip, in order to develop appropriate control methods for suppression. This paper studies the stick-slip oscillations encountered in drill-strings from both numerical and experimental points of view. The numerical part is carried out based on path-following methods for non-smooth dynamical systems, with a special focus on the multistability in drill-strings. Our analysis shows that, under a certain parameter window, the multistability can be used to steer the response of the drill-strings from a sticking equilibrium or stick-slip oscillation to an equilibrium with constant drill-bit rotation. In addition, a small-scale downhole drilling rig was implemented to conduct a parametric study of the stick-slip phenomenon. The parametric study involves the use of two flexible shafts with varying mechanical properties to observe the effects that would have on stick-slip during operation. Our experimental results demonstrate that varying some of the mechanical properties of the drill-string could in fact control the nature of stick-slip oscillations.

摘要

粘滑现象的周期性可能会导致钻柱出现灾难性故障，或者至少会导致昂贵设备的磨损。因此，研究可能导致粘滑的钻井参数非常重要，以便开发适当的抑制控制方法。本文从数值和实验两个角度研究了钻柱中遇到的粘滑振动。数值部分基于非光滑动力系统的路径跟踪方法进行，特别关注钻柱中的多稳定性。我们的分析表明，在一定的参数窗口下，多稳定性可用于将钻柱的响应从粘附平衡或粘滑振动引导至钻头匀速旋转的平衡状态。此外，还搭建了一台小型井下钻机来对粘滑现象进行参数研究。该参数研究涉及使用两根机械性能不同的挠性轴，以观察其在运行过程中对粘滑的影响。我们的实验结果表明，改变钻柱的一些机械性能实际上可以控制粘滑振动的性质。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ea16/6959376/aad06ab82e09/11071_2017_3855_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ea16/6959376/1f173b857902/11071_2017_3855_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ea16/6959376/5e39504528bc/11071_2017_3855_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ea16/6959376/c86aa457f6f2/11071_2017_3855_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ea16/6959376/1a564ec39f56/11071_2017_3855_Fig11_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ea16/6959376/351a347c2b88/11071_2017_3855_Fig15_HTML.jpg

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