DCX固井模拟冲洗效率评价装置的研制

为了定量分析冲洗液对渗透性地层滤饼的冲洗作用规律,研制了DCX固井模拟冲洗效率评价装置。该装置不仅可以模拟渗透性地层泥饼的形成过程,还可以评价冲洗液在不同工况下对滤饼的冲洗效率。利用该装置测试了2种冲洗液对2种不同性能钻井液在不同条件下形成泥饼的冲洗效率。结果表明:在不同因素影响下,冲洗效率差异很大,相差达到5.56%~7.76%;应根据试验数据进行综合分析评价,优选出最佳的冲洗方案来保证第二界面的清洁。该冲洗评价装置可为分析冲洗液对第二界面的冲洗规律提供新的试验手段,也可为提高第二界面的冲洗效率提供试验数据。 

Development of Cementing Evaluation Equipment DCX for Flushing Efficiency

The DCX cementing flushing evaluation simulator was developed to quantitatively analyze working mechanism of flushing fluid to filter cake at the permeable layers.The apparatus can not only simulate the cake forming process,but also simulate the flushing efficacy under the different operating conditions.With the device,a series of experiments were conducted to evaluate the flushing efficiency of two kinds of flushing fluids on cakes formed by two kinds of drilling fluids.The experimental results showed that:the flushing efficiency varied widely when influential factors changed,with the biggest disparity being 5.56%-7.76%.The best flushing program,which could ensure the cleanliness of annular interface,could be selected through comprehensive evaluation and data analysis.The apparatus offers a new means for analyzing the working mechanism of the flushing fluid and provides reliable experimental data for improving flushing efficiency.