According to strain coordination condition, the force and deformation state formulas of casing, cement loop and stratum are derived.
根据应变协调条件，推导出了套管、水泥环及地层受力变形状态的计算公式。
Different closed loop poles are selected according to the damping ratio and dead time, and simple formulas are provided for the calculation.
按照阻尼比和模型的延迟时间选择不同的闭环极点，并且为计算提供了简单的公式。
After making a lot of mathematical calculations by use of the mathematical-physical method, the formulas describing the gas unsteady flow in various loop networks are obtained.
然后应用数学物理方法，经过一系列的数学演算过程，最后得出描述各类环形管网内气体不稳定流动规律的数学表达式。
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