Rotary Steerable Drilling Dynamics and Associated BHA Changes to Improve Overall BHA Performance and Reliability

Abstract

During the advanced development phase of a push-the-bit rotary steerable system (RSS), downhole drilling dynamics were captured utilizing high-frequency embedded drilling dynamics sensors distributed throughout the bottom-hole assembly (BHA). The RSS development testing was conducted in a challenging pocket of the Delaware Basin in the Permian Region of North America. This specific Delaware area has proven difficult to drill with conventional steerable motors due to rapid shoulder wear on the bit and sliding difficulties (Sugiura et al. 2022). The initial RSS BHAs were designed based on the directional objectives of the well. As the runs and wells progressed, the multiple embedded drilling dynamics sensor data, BHA/bit component wear and reliability, and drilling performance were all analyzed. From these learnings, systematic BHA changes were implemented and measured. This process continued until the drilling pace, reliability and repeatability were at an acceptable level for the project. This paper details the drilling dynamics, drilling parameters, BHA configurations, formations, and logic for BHA/drilling parameter changes in the 12 ¼-in. intermediate section.