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为了准确测量近钻头处的钻压扭矩等工程参数,利用材料力学的相关知识,定量分析了近钻头工程参数测量短接实际工况下的应力与应变特征,据此确定了测量短接传感部分的基本结构参数。使其既能保证钻井安全,又能提高测量信号的机械放大倍数,降低了微弱信号检测的难度。利用误差理论分析了影响测量短接误差的主要原因,并对应变片粘贴误差与测量短接内外压力影响进行了定量分析与计算,为应变片粘贴精度要求、测量短接内外压力影响的在线补偿等实际测量问题的解决提供依据。
In order to accurately measure the drill bit torque and other engineering parameters near the bit, the use of material mechanics knowledge, quantitative analysis of the near-bit engineering parameters measured short-circuit under the actual conditions of stress and strain characteristics, thus determining the measurement of short sensing Part of the basic structural parameters. It can not only ensure drilling safety, but also improve the mechanical magnification of the measurement signal, reducing the difficulty of weak signal detection. The error theory is used to analyze the main factors that affect the short-circuit error of measurement, and the quantitative analysis and calculation of the influence of the error of the sticking of the strain gauge and the external and internal pressure of the short-circuit are carried out. The online compensation Such as the actual measurement problems to provide the basis for the solution.