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<p>A multi-physics coupling model is proposed. It is designed for dynamic push-the-bit rotary steerable systems to address Build-Up Rate enhancement in deep, complex wells. Internal flow characteristics of the actuator are integrated with the nonlinear mechanics of the Bottom Hole Assembly (BHA). Interactions of multiple factors are considered in the model. These factors include fluid rheology, channel topology, and tool geometry. The model’s reliability is verified. Comparisons are made between full-scale bench tests and field drilling data. Nonlinear mapping laws governing hydraulic energy–mechanical structure–macroscopic trajectory are revealed: (1) Steering performance is actively driven by the flow rate. A significant quadratic positive correlation with lateral force is exhibited. (2) Impedance matching and cascaded expansion principles must be followed in channel design. Lateral force is inversely regulated by the restrictor area in an exponential manner. Distinct flow dead zones and saturation characteristics are observed in diversion ports. (3) Linear doubling and nonlinear enhancement of BUR are achieved by altering the steering arm length and conduction window, respectively. This is realized while hydraulic thrust is kept constant. A theoretical basis is provided by these findings. Structural optimization and field parameter selection for dynamic push-the-bit RSS are supported.</p>

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Mechanism Study on Build-Up Rate Enhancement for Dynamic Push-the-Bit Rotary Steerable Systems

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Wei Chen,
  • Bo-tao Zhou,
  • Wen-ting Liu,
  • Yu-ting Zhou

摘要

A multi-physics coupling model is proposed. It is designed for dynamic push-the-bit rotary steerable systems to address Build-Up Rate enhancement in deep, complex wells. Internal flow characteristics of the actuator are integrated with the nonlinear mechanics of the Bottom Hole Assembly (BHA). Interactions of multiple factors are considered in the model. These factors include fluid rheology, channel topology, and tool geometry. The model’s reliability is verified. Comparisons are made between full-scale bench tests and field drilling data. Nonlinear mapping laws governing hydraulic energy–mechanical structure–macroscopic trajectory are revealed: (1) Steering performance is actively driven by the flow rate. A significant quadratic positive correlation with lateral force is exhibited. (2) Impedance matching and cascaded expansion principles must be followed in channel design. Lateral force is inversely regulated by the restrictor area in an exponential manner. Distinct flow dead zones and saturation characteristics are observed in diversion ports. (3) Linear doubling and nonlinear enhancement of BUR are achieved by altering the steering arm length and conduction window, respectively. This is realized while hydraulic thrust is kept constant. A theoretical basis is provided by these findings. Structural optimization and field parameter selection for dynamic push-the-bit RSS are supported.