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    Method for controlling well bore pressure based on model prediction control theory and systems theory
    2.
    发明申请
    Method for controlling well bore pressure based on model prediction control theory and systems theory 有权
    基于模型预测控制理论和系统理论的井筒压力控制方法

    公开(公告)号：US20140262246A1

    公开(公告)日：2014-09-18

    申请号：US14351573

    申请日：2011-11-04

    申请人： Zhilin Li ,  Bin Dong ,  Haifang Sun ,  Liexiang Han ,  Runde Xiao ,  Bo Yang ,  Gui Tang ,  Qiulai Xue ,  Qiang Wei ,  Guojun Tang ,  Xing Zuo

    发明人： Zhilin Li ,  Bin Dong ,  Haifang Sun ,  Liexiang Han ,  Runde Xiao ,  Bo Yang ,  Gui Tang ,  Qiulai Xue ,  Qiang Wei ,  Guojun Tang ,  Xing Zuo

    IPC分类号： E21B41/00 ,  E21B47/10

    CPC分类号： E21B49/00 ,  E21B21/08 ,  E21B41/0092 ,  E21B47/1025

    摘要： A method for controlling well bore pressure based on model prediction control theory and systems theory, which belongs to the field of well bore pressure control technique, includes: detecting a well bottom pressure, a stand pipe pressure, a casing pressure, an injection flow rate and an outlet flow rate during construction process, and determining the presence of overflow or leakage; if there is no overflow or leakage, then fine-adjusting the wellhead casing pressure according to the slight fluctuations of the well bottom pressure, the stand pipe pressure or the casing pressure, ensuring that the well bottom pressure, the stand pipe pressure or the casing pressure are at a set value; if there is overflow or leakage, then using a well bore multi-phase flow dynamic model to simulate and calculate the overflow or leakage position and starting time of the overflow or leakage, predicting the variation over a future time period of the well bore pressure in the well drilling process, and utilizing an optimization algorithm to calculate the control parameter under a minimum of an actual well bottom pressure difference during the future period; and repeating the optimization process for the next time period after a first control parameter is selected and set. The present method enables the well bore pressure to be controlled within the allowable fluctuation range of a project, thus achieving precise pressure control.

    摘要翻译： 基于井眼压力控制技术领域的模型预测控制理论和系统理论，控制井筒压力的方法包括：检测井底压力，立管压力，套管压力，喷射流量 和施工过程中的出口流量，并确定溢出或泄漏的存在; 如果没有溢出或泄漏，则根据井底压力，立管压力或套管压力的轻微波动来微调井口套管压力，确保井底压力，立管压力或套管 压力处于设定值; 如果有溢流或泄漏，则使用井筒多相流动力学模型来模拟和计算溢流或泄漏位置以及溢流或泄漏的开始时间，预测未来时间段内井筒压力的变化 钻井过程，并利用优化算法在未来期间在最小实际井底压力差下计算控制参数; 并且在选择和设置第一控制参数之后，重复下一时间段的优化处理。 本方法能够将井筒压力控制在工程的容许波动范围内，从而实现精确的压力控制。