Method for determining the loads on the deflection module of the push-the-bit rotary steerable system

Abstract

Abstract The article presents a method for calculating the loads on the blades - elements of the deflecting module of the push-the-bit rotary steerable system for directional drilling of oil and gas wells, affecting its reliability. It is shown that the reliability of rotary steerable systems is of particular importance as the development of unconventional oil fields expands - a highcost process that increases attention to specific factors of reliability of drilling equipment. A feature of the method for calculating the loads on the deflecting blades proposed by the authors is the representation of the rotary steerable system as an absolutely elastic rod, which is acted upon by a complex of forces arising from the directional wells with horizontal wavy segments. As a result of calculations, conditions were determined under which the interaction of forces acting on the deflecting blades will create a load close to the maximum permissible values, which increases the risk of failure of the entire bottomhole assembly of the rotary steerable system. The key condition was the change in the drilling segments of directional wells from ascending to descending when drilling a horizontal section with a wave profile, as a result of which there is a multiple load drop on the deflecting blades. Based on the calculated data, with an increase in the axial load, it is recommended to adjust the drilling mode to reduce the risk of failure of the push-the-bit rotary steerable system.