Optimal monitoring position of rotary-steering downhole ranging

Wentao Dong; Hong Zhang; Yong Wang; Yumei Li; Li Fu; Jiao Wang

doi:10.1117/12.2640804

20 September 2022 Optimal monitoring position of rotary-steering downhole ranging

Wentao Dong, Hong Zhang, Yong Wang, Yumei Li, Li Fu, Jiao Wang

Proceedings Volume 12261, International Conference on Mechanical Design and Simulation (MDS 2022); 1226104 (2022) https://doi.org/10.1117/12.2640804
Event: Second International Conference on Mechanical Design and Simulation (MDS 2022), 2022, Wuhan, China

Abstract

The rotary-steering downhole closed-loop control has achieved drilling tool face regulation and control; however, the drilling distance is controlled via a command from the surface. Downhole ranging can compensate for the lack of surface control and is needed to achieve the global closed-loop control downhole. In this study, based on the basic theory of dynamics, a theoretical model of the well bottom, drill bit and -string dynamic system in guided drilling is built to simulate and analyze the regional distribution characteristics and influencing factors of drill string vibration during guided drilling. The study shows that with the increase in bit pressure, axial and lateral vibration intensities of the drill string transfer from the bottom to the wellhead and gradually weakens. The vibration stabilizes at a position higher than the neutral position of the drill string, and the comparison shows that the axial vibration intensity transfers more to the wellhead than lateral vibration under bit pressure; with the increase in rotational speed, the trend of transferring axial and lateral vibration intensities of the drill string, from the bottom to the wellhead, is similar to that under bit pressure; however, the transfer of axial and lateral vibration intensities to the wellhead is not evident with the increase in rotational speed. The study concludes that the optimal placement area of the rotary-steering downhole-ranging tool is the stable vibration region ranging from the well bottom to more than two times the distance between the neutral point and well bottom. This study can provide a reference for the study of downhole global closed-loop control.

Citation Download Citation

Wentao Dong, Hong Zhang, Yong Wang, Yumei Li, Li Fu, and Jiao Wang "Optimal monitoring position of rotary-steering downhole ranging", Proc. SPIE 12261, International Conference on Mechanical Design and Simulation (MDS 2022), 1226104 (20 September 2022); https://doi.org/10.1117/12.2640804

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KEYWORDS

Ranging

Analytical research

Mechanics

Navigation systems

Lithium

Finite element methods

Information technology

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