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A generalized quasi-static model of drill string system

机译：钻柱系统的广义准静态模型

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摘要

Accurate prediction of the drilling status needs an effective inversion calculation of the relevant parameters of the drill string system. In the previous studies, the inversion calculation was done by a trial and error method of low efficiency. To overcome this shortcoming, an automatic generalized quasi-static model of high efficiency of the drill string system is proposed in this paper. Firstly, the general form of the quasi-static model of drill string system (forward model) is given. However, practice has proven that the calculated results from the forward model are usually not consistent with the measured results of the drill string system. Then, the relevant deviations in the forward calculation are analyzed, and an inversion model is proposed to revise the model parameters. Different forms of the inversion models in the drilling design and actual drilling stages are given. Thirdly, the forward model and inversion model are further combined into a unity, namely generalized model. The generalized model is not only an advanced model depicting the drill string system, but also a powerful tool applied to practice. At last, the application of the generalized model to a real field is discussed. (C) 2015 Elsevier B.V. All Tights reserved.
机译：准确预测钻井状态需要对钻柱系统相关参数进行有效的反演计算。在以前的研究中，反演是通过低效率的反复试验法进行的。为克服这一缺点，本文提出了一种高效的钻柱系统自动广义准静态模型。首先，给出了钻柱系统准静态模型（正向模型）的一般形式。但是，实践证明，正向模型的计算结果通常与钻柱系统的测量结果不一致。然后，分析了正向计算中的相关偏差，并提出了一个反演模型来修正模型参数。给出了钻井设计和实际钻井阶段反演模型的不同形式。第三，将正向模型和反演模型进一步组合为一个统一的模型，即广义模型。广义模型不仅是描述钻柱系统的高级模型，而且是应用于实践的强大工具。最后，讨论了广义模型在实际领域中的应用。 （C）2015 Elsevier B.V.版权所有。

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