For logging instrument in use and promotion, the lack of system and the application of theoretical basis of indoor research means that it's difficult to form the commercial scale and restricts its development seriously. According to the operating principle of micro resistivity imaging, ultrasonic imaging, the model of the actual motion measurement and combining with the characteristics of the laboratory, we devised an analog measuring equipment for electroacoustic imaging detector, which had realized the movement of x, y, z and d four direction, devised various schemes for x, d. By using the principle of fuzzy evaluation, the membership functions and weight for various schemes of x, d directions were established. Using the principle of fuzzy evaluation, we evaluated kinds of schemes of the d and x direction comprehensively, and established the membership function and weight. The factors set and fuzzy comprehensive evaluation set were estabished through the expert scoring form and selected the optimal case, x as double linear motor transmission, d as bevel gear drive. The measurement device could provide further research of methods for imaging technology.

通过分析气体钻井井底岩石边界条件,建立了轴对称井底岩石物理模型。利用有限元方法求解,对1 000～3 000 m井深条件下的井底岩石应力场进行数值模拟计算,并对井眼轴线、井底面、井壁进行岩石力学特性分析。分析结果表明,井轴最大主应力在1.6～2.8倍井径距离后,应力逐渐低至水平地应力,破岩难度增加;井底面0.0～0.8倍井径区域存在低应力区,有利于岩石破碎;在井底面向上0.0～0.2 m井壁范围内出现拉应力增加趋势,易出现井壁失稳现象。