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介绍了一种空气雾化钻井井壁稳定性模拟实验装置,该装置雾化效果好,雾化液量、风速、温度可调节,可很好地模拟液滴与岩心的相互作用和高速气流对井壁的剪切作用。提出两种评价井壁稳定性的方法:井壁针入度法和井径法。针入度和井径均可用针入度仪测定。针入度法能敏感地反映岩心与雾化空气之间因物理化学作用所引起的岩心强度的变化;井径法能反映岩心遇雾时吸水膨胀和风速对井壁剪切冲蚀作用的综合结果。这两种评价方法重现性好,规律性强。
A simulation experiment device for the wellbore stability of air atomized drilling is introduced. The device has good atomization effect, adjustable atomization volume, wind speed and temperature, which can well simulate the interaction between droplet and core and high-speed airflow Shear wall shear effect. Two methods for evaluating wellbore stability are put forward: well wall penetration method and caliper method. Penetration and caliper can be measured with a needle penetration meter. The penetration method can sensitively reflect the change of core strength caused by the physicochemical interaction between the core and the atomized air. The well diameter method can reflect the combination of water swelling and wind speed on the shear and erosion of the shaft lining when the core encounters mist result. Both evaluation methods have good reproducibility and regularity.