Authors: A.V. Epikhin, V.S. Zhironkin, J. Janočko

Title of the article: Influence of loads on reliability of rotary steerable system of directional drilling of "Push-the-bit" type.

Year: 2020, Issue: 3, Pages: 45-57

Branch of knowledge: 25.00.21 Theoretical foundations of the design of mining systems

Index UDK: 622.24.05

DOI: 10.26730/1999-4125-2020-3-45-57

Abstract: The article presents an original approach to the study of loads on the elements of the steering module of a rotary steerable system "Push-the-Bit" as a specific factor of the system's reliability, which becomes especially important as the share of unconventional oil fields development grows – a high-cost process that increases reliability requirements for drilling equipment. The main principle is to represent the module of the rotary steerable system as an absolutely elastic rod, which is acted upon by a complex of forces arising during drilling of inclined and horizontal undulating wells. Under certain conditions, the interaction of the forces, resulting in the load on the steering blade, can approach the maximum values, which increases the risk of failure of the entire assembly. The article substantiates the phenomenon of multiple load drops on the steering blade during the change of the drilling interval from ascending to descending during the horizontal section with a wave profile. Based on the analysis of the influence of the axial load on the load on the steering blade, it is recommended to adjust the drilling mode to reduce the risk of failure of "Push-the-Bit" system. The advantage of the proposed method is its applicability for analyzing the loads on steering modules not only for “Push-the-Bit” systems, but also for the most modern combined ones (Schlumberger Archer, etc.). Attention is also paid to the possibility of reducing the load on the steering blade by changing the concentration of the lubricating additive in the drilling fluid, subject to further studies.

Key words: drilling rotary steerable system “push-the-bit” steering blade load reliability

Receiving date: 18.08.2020

Publication date: 30.09.2020

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