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Limitations of Topside Actuation for Rejecting Heave-induced Pressure Oscillations in Offshore Drilling

机译:顶部驱动抑制海上钻井中升压压力振荡的局限性

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The heave motion of a floating rig induces pressure oscillations in the well when the heave compensators are disabled during connections. In this paper we discuss several factors affecting the achievable performance when rejecting such pressure oscillations by feedforward by controlling the opening of the topside choke. Here, the well is modeled as a semilinear hyperbolic system with a predictor-based control law that achieves exact pressure tracking at one location in the well in the nominal case. The focus is on wells with large friction (i.e. deep wells with high-viscosity drilling muds), where large control inputs are required at the topside choke.
机译:当在连接期间禁用升降补偿器时,浮动钻机的升降运动在井中引起压力振荡。在本文中,我们讨论了通过控制顶部扼流圈的开口来抑制这种压力振荡时影响可实现的性能的几个因素。这里,该井被建模为具有基于预测的控制法的半线性双曲线系统,该控制法在良好的案例中在井中的一个位置实现精确的压力跟踪。重点是具有大摩擦的井(即,具有高粘度钻井泥浆的深井),在线扼流圈需要大控制输入。

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