Automatic control system is the core technology of managed pressure drilling (MPD). Multilevel hierarchical logic control strategy was introduced into MPD control system. There are three control levels,feedback control (level I ),forecasting and monitoring control (level Ⅱ ) and multi-objective optimization (level Ⅲ). A multi-level hierarchical intelligent control strategy was designed. The paper demonstrated the reliability of multi-level hierarchical control strategy and work characteristics. A model predictive control (MPC) algorithm was introduced in level II. Combined with real-time data,flow model and the control loop system analysis, the paper developed a continuous data updating method for drilling borehole flow model and mechanics model. The method and process the control real-time bottom-hole pressure was provided, which established a solid foundation for speeding up of MPD automatic control system development.%自动控制系统是控压钻井的核心技术,是控压钻井作业成功的关键.在控压钻井自动控制系统中引入了分级递阶智能控制的概念,将控制系统分为反馈控制、预测和监测控制和多目标优化控制3个层次,建立了分级智能控制的概念设计,并论证了多级控制策略的可靠性和工作特点;同时在参数预测与监测控制中引入了模型预测控制算法(MPC),结合实时数据测量、流动模型和控制回路的系统分析,提出了一种持续对井眼流动模型和钻井力学模型进行数据更新的方法,并给出了控压钻井井底压力实时模型预测控制的方法和流程.
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