Determination of the Loads on the Steering Module of the Push-the-Bit Rotary Steerable System in the Context of Its Reliability

elements of a bias unit of the push-the-bit rotary steerab
a specific factor of system reliability, which becomes especially
important as the share of the development of unconventional oil
fields grows. It is a high-cost process that increases requirements for
the reliability of drilling equipment. The basic principle of the
proposed idea is the representation of the module of a rotary
steerable system as an absolutely elastic rod, which is acted upon by
a complex of forces arising from the directional and horizontal
undulating well profiles. Under certain conditions, the interaction of
these forces, resulting in the load on the steering pad, can approach
the maximum values, which increases the risk of failure of the
entire bottom-hole assembly of the rotary controlled system. This
article substantiates the phenomenon of multiple load drops on the
steering pad in the process of changing the drilling interval of
directional wells from ascending to descending when drilling a
horizontal section with a wave profile. In this regard, based on the
analysis of the weight on bit effect on the steering pad load, it is
recommended to adjust the drilling mode to reduce the risk of
failure of the push-the-bit rotary steerable system. The advantage of
the presented method, along with computational efficiency and
visualization, is applicability for load analysis not only for push
bit rotary steerable systems but also for the most modern combined
systems. Attention is also paid to the possibility of reducing the load
on the steering pedals by changing the concentratio
in the drilling mud upon the condition of follow
effect of these changes on the rotary steerable systems operation.