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DOWNHOLE PRESSURE CONTROL METHOD BASED ON CONTROL THEORY WITH PREDICTION MODELS AND SYSTEM THEORY

机译：基于预测模型和系统理论的控制理论的井下压力控制方法

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FIELD: oil and gas industry.SUBSTANCE: downhole pressure control method based on control theory with prediction models and system theory is referred to downhole pressure control technologies. This method includes: determination of downhole pressure, standpipe pressure, casing pressure, injection rate and output flow in process of well construction, and determination of available overflow or loss. Besides, when overflow or loss is unavailable fine adjustment of casing pressure at well mouth is carried out in compliance with low fluctuations of downhole pressure, standpipe pressure or casing pressure in order to ensure set pressure value of bottomhole pressure, standpipe pressure or vertical casing pressure. Besides, when overflow or loss is available a dynamic model of single-phase or multiphase flow is used in the well bore in order to simulate and compute location of overflow or loss and time of overflow or loss commencement. This method includes additionally: prediction of downhole pressure changes in future in process of well drilling and usage of optimisation algorithm to calculate control parameter that ensures minimum deviation of actual downhole pressure from the preset value in future. Optimisation process is repeated for the next time period upon selecting and setting of the first control parameter.EFFECT: downhole pressure control within permitted range of fluctuations according to design requirements thus implementing highly accurate pressure control.7 cl, 4 dwg
机译：领域：基于控制理论，预测模型和系统理论的井下压力控制方法被称为井下压力控制技术。该方法包括：确定井的施工过程中的井下压力，竖管压力，套管压力，注入速率和输出流量，以及确定可用的溢流或损失。此外，在无法进行溢流或损失的情况下，为了确保井底压力，竖管压力或垂直套管压力的设定压力值，根据井下压力，竖管压力或套管压力的低波动对井口的套管压力进行微调。 。此外，当溢流或损失可用时，在井筒中使用单相或多相流的动态模型，以便模拟和计算溢流或损失的位置以及溢流或损失开始的时间。该方法还包括：预测钻井过程中未来井下压力的变化，以及使用优化算法来计算控制参数，以确保将来实际井下压力与预设值的最小偏差。选择和设置第一个控制参数后，将在下一个时间段重复优化过程。效果：根据设计要求，将井下压力控制在允许的波动范围内，从而实现高度精确的压力控制。7cl，4 dwg

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