Analysis of amplitude-phase functions of the drill string as a component of automation systemAnalysis of amplitude-phase functions of the drill string as a component of automation system

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.120544

Keywords:

drilling process, amplitude-phase characteristics, drill string, energoinformational approach, automated system

Abstract

We determined amplitude-phase frequency functions of the drill string for translational motion while drilling with immersed engines. It was established that amplitude-phase characteristic of the drill string changes with increasing depth of the well. When drilling in hard rocks, it is advisable to use cushion subs in order to reduce the level of reflected wave of mechanical stresses. To eliminate the impact of the reflected wave, it is necessary to apply a bit feed drive with absolutely soft mechanical characteristics.

We performed analysis of dynamic modes of the process of drilling wells as a control object based on provisions of the synergetic theory of information. It is proposed to employ energoinformational approach to analyze processes in the system of control over well drilling. This is due to the fact that the drilling process evolves over time and functions under conditions of the a priori and current uncertainty in terms of parameters and structure of the object. Since such a system develops over time, it undergoes changes in the structure of design of the drill string. Therefore, in order to resolve tasks on control over the process of drilling, it is necessary to know how dynamic properties of the column change depending on depth.

We identified five modes of operation in the process of drilling as a complex dynamic system: equilibrium, ordered, sorted-chaotic, randomly-ordered, and chaotic. This makes it possible to solve an important applied problem of determining amplitude-phase characteristics of the drill string depending on depth of the well, and to use them for mathematical substantiation of automated control system over drilling. 

Author Biographies

Vitaliai Kropyvnytska, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Computer Systems and Networks 

Taras Humeniuk, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD

Department of Computer Systems and Networks 

Natalya Sabat, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD

Department of Computer Systems and Networks

Georgiy Sementsov, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Doctor of Technical Sciences, Professor

Department of automation computer-integrated technologies

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Published

2018-01-11

How to Cite

Kropyvnytska, V., Humeniuk, T., Sabat, N., & Sementsov, G. (2018). Analysis of amplitude-phase functions of the drill string as a component of automation systemAnalysis of amplitude-phase functions of the drill string as a component of automation system. Eastern-European Journal of Enterprise Technologies, 1(2 (91), 48–58. https://doi.org/10.15587/1729-4061.2018.120544

Issue

Vol. 1 No. 2 (91) (2018): Information technology. Industry control systems

Section

Industry control systems

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Copyright (c) 2018 Vitaliai Kropyvnytska, Taras Humeniuk, Natalya Sabat, Georgiy Sementsov

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