During drilling fluid preparation, ultrasonic oscillations were introduced into water-bentonite suspension incorporating sulfonated wood coal (SMC) by a specially designed device. The influences of ultrasonic oscillations on fluid loss and rheological performances of the drilling fluid as well as mechanism of ultrasonic action were investigated. The experimental results showed that the filtrate volume decreased with the increase of ultrasonic time till a certain extent and then leveled off. In the presence of ultrasound, shorter time of 15 min and mild intensity of 250 W could lead to a satisfactory result in fluid loss properties, including the reasonable filtrate volume and thin and compact filter cakes. With increasing ultrasonic intensity, the fluid loss properties changed relatively little but various rheological data of the drilling fluids always increased. Adsorption tests through total organic carbon, infrared spectrum and thermogravimetic analyses as well as clay particle size analysis confirmed that as compared with the conventional agitation, ultrasound-assisted mud preparation could not only increase adsorbed amount of SMC on bentonite but also decrease average clay particle diameter attributed to acoustic cavitation. A plausible mechanism based on sonochemical thermodynamics is proposed to explain the improvement of the colloidal structure and performances of drilling fluid.

在准备钻井液期间，通过特殊设计的装置将超声振荡引入掺有磺化木煤（SMC）的水-膨润土悬浮液中。研究了超声振荡对钻井液的流失，流变性能的影响以及超声作用机理。实验结果表明，随着超声时间的增加，滤液体积逐渐减小直至一定程度，然后趋于平稳。在存在超声波的情况下，较短的15分钟时间和250 W的适度强度可能会导致令人满意的流体损失性能，包括合理的滤液体积和稀薄的滤饼。随着超声波强度的增加，流体损失特性的变化相对较小，但钻井液的各种流变数据始终在增加。通过总有机碳，红外光谱和热重分析以及粘土粒度分析进行的吸附测试证实，与常规搅拌相比，超声辅助泥浆制备不仅可以增加膨润土上SMC的吸附量，而且可以降低平均粘土粒径归因于声空化。提出了一种基于声化学热力学的合理机制来解释胶体结构的改进和钻井液的性能。红外光谱和热重分析以及粘土粒度分析证实，与常规搅拌相比，超声辅助泥浆制备不仅可以增加膨润土上SMC的吸附量，而且可以降低声空化的平均粘土粒径。提出了一种基于声化学热力学的合理机制来解释胶体结构的改进和钻井液的性能。红外光谱和热重分析以及粘土粒度分析证实，与常规搅拌相比，超声辅助泥浆制备不仅可以增加膨润土上SMC的吸附量，而且可以降低声空化的平均粘土粒径。提出了一种基于声化学热力学的合理机制来解释胶体结构的改进和钻井液的性能。