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钻进过程中泥浆性能依温度、压力、固相成分会呈现复杂的变化。根据井内情况要调整比重、粘度、造壁性等性能，其中调整粘度最为复杂。利用高温高压粘度计来评价温度、压力的影响，已发表了许多论文，但均难以再现井内的实际条件。最好能在钻进现场评价这些影响。钻进过程中泥浆连续地从地表——井底——地表进行循环，温度和压力的影响一般较难测定。但在提下钻时，泥浆在井内长时间处于高温、高压环境下，这些影响却是测定的。基于这种想法，连续测定了提下钻前后从井内返出的泥浆性能以评价：
During drilling, the performance of mud will show complex changes according to temperature, pressure and solid phase composition. According to the well situation to adjust the proportion, viscosity, wall-making properties, including the adjustment of the most complex viscosity. The use of high temperature and high pressure viscometer to evaluate the effects of temperature and pressure, many papers have been published, but it is difficult to reproduce the actual conditions within the well. It is best to evaluate these effects at the drilling site. During the drilling process, the mud continuously circulates from the surface to the bottom of the ground, and the influence of temperature and pressure is generally difficult to determine. However, when drilling, mud in the well for a long time in high temperature, high pressure environment, these effects are measured. Based on this idea, the performance of the mud returning from the well before and after drilling was continuously measured to evaluate: