Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Experimental Comparison of PID Based RPM Control for Long Horizontal vs. Vertical Drillstring

Version 1 : Received: 26 November 2021 / Approved: 29 November 2021 / Online: 29 November 2021 (12:39:42 CET)

How to cite: Sharma, A.; Srivastava, S.; Teodoriu, C.; Stan, M. Experimental Comparison of PID Based RPM Control for Long Horizontal vs. Vertical Drillstring. Preprints 2021, 2021110536 (doi: 10.20944/preprints202111.0536.v1). Sharma, A.; Srivastava, S.; Teodoriu, C.; Stan, M. Experimental Comparison of PID Based RPM Control for Long Horizontal vs. Vertical Drillstring. Preprints 2021, 2021110536 (doi: 10.20944/preprints202111.0536.v1).

Abstract

Drilling vibrations has been identified as a key performance limiter that prevents successful energy transfer from the surface to the bit. The resultant irregular bit rotation speed causes drilling challenges like poor hole quality and reduction in rate of penetration to name a few. Amongst other vibration suppression techniques, active control of vibrations is widely used and recommended. Active control system utilizes a closed loop feedback control to continuously adapt to downhole vibrations detected at the surface. The system requires regular tuning and upgrades which is done experimentally before field deployment. The paper presents a PID based experimental tuning of horizontal and vertical strings for irregular RPM. In doing so, the paper highlights the need of having horizontal experimental setups for state-of-the-art PID tuning for downhole RPM. The settling time of irregular RPM for horizontal setup is found to be lower than the vertical configuration due to multiple contact points and increased friction coefficient.

Keywords

PID tuning; drilling vibrations; feedback control; RPM control

Subject

ENGINEERING, Control & Systems Engineering

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