The instance proves that this methods can calculate out the variation tendency of the parameters accurately in some time, and can be used in discerning bottom well operating modes.
实例证明，用该方法能较准确的计算出一段时间内某钻进参数的变化趋势，可以用于井内工况识别。
The methods and procedures for determining the parameters in those models were defined, and the rules of variation of some parameters with change of direction were studied.
拟定了求定模型参数的方法和步骤，研究了参数随方向变化的规律。
In this paper, the methods of variation of parameters for salving the Vacco dynamical equations are given.
本文使用全微分法和常数变易法，从不同角度给出伯努利方程通解的公式。
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