Geometrical optics approach can only calculate the high frequency approach solution of drilling bit vibration source wave equation in non caustic area but it become invalid in caustic area.
由于几何光学法求解钻头震源波动方程的高频近似解有局限性，即在焦散区失效，故只能计算非焦散区的高频近似解。
Low penetration as well as drilling incidents of high frequency resulted from problems caused by leakage, gas migration, collapsing sticking, well kick, blowout and so forth.
且常发生井漏、气侵、坍塌性卡钻、井涌与井喷等井下复杂问题，导致机械钻速低与钻井事故频发。
And we have CNC, CJK, Punch press, high-frequency heating machine, argon arc welding machine , drilling machine….
拥有数控车床，冲床，仪表车，锯床，高频电热机。脉冲氩弧焊机，电焊机，钻床等设备。
And we have CNC, CJK, Punch press, high-frequency heating machine, argon arc welding machine , drilling machine….
拥有数控车床，冲床，仪表车，锯床，高频电热机。脉冲氩弧焊机，电焊机，钻床等设备。
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