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methods for the analysis of resistance and the drehmomentverlustes during drilling.
methods for the analysis of resistance and the drehmomentverlustes during drilling.
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机译：钻孔过程中阻力和透湿性的分析方法。
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摘要
Drilling conditions are analyzed by, for example, measuring the torque (37) applied at the surface to the drill string (11) and the effective torque (20) acting on the drill bit (14). The applied torque and effective torque are compared to determine torque loss. Likewise, applied weight on the drill string and effective weight acting on the drill bit may be measured and compared to determine drag losses. These measurements and comparisons may be done in real-time to diagnose unfavorable drilling conditions. The torque or weight measurements may be used to calculate a variable coefficient of friction acting on the drilling string. Trends in the torque or weight losses, or in the value of the coefficient of friction, may be observed on a plot of these quantities as a function of depth.
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