可循环微泡沫钻井液的微泡粒径影响因素研究

Effect Factors of Microbubble Size in Recirculated Micro-Foam Drilling Fluid

采用显微照相技术结合NanoMeasurerl．2粒径分析软件研究了搅拌速率、搅拌时间、稳泡剂黄原胶（XC）和自制起泡剂DBA2-14（两性双子表面活性剂）的浓度对微泡沫粒径的影响。结果表明，高速搅拌和增加稳泡剂浓度有利于形成均匀、细小、稳定的泡沫，而搅拌时间和起泡荆的浓度对微泡沫粒径无显著影响。制备微泡沫体系的最佳条件为：0．4％羧甲基纤维素钠（HV-CMC）、0．4％XC、0．2％DBA搅拌速率10000r／min，搅拌时间2min。微泡沫粒径在23．58--109．65岬，平均直径为71．87μm。微泡沫粒径随静置时间的延长逐渐增大，静置12h后的微泡沫平均粒径小于200lun。

The effects of mixing rate, mixing time, concentrations of foam stabilizer xanthan gum （XC） and homemade surfactant DBA2 on the size of microbubbles were investigated using microscopic-imaging technique combined with Nano Measurerl.2 size analysis software. The results showed that high mixing rate and increasing XC concentration were beneficial to generate homogeneous distribution, fine and stable bubbles. However, the bubble size did not change significantly as the mixing time and surfaetant concentration different. The optimum reaction condition of microbubble system was obtained as follows： 0.4% sodium carboxymethylcellulose （HV-CMC）, 0.4% XC, 0.2% DBA24, 10000 r/min mixing rate and 2 min mixing time. The corresponding size of mierobubble was between 23.58 lain and 109.65 trn with a mean size of 71.87 pmo The microbubbles would slowly grow bigger with the lapse of standing time, but its size did not exceed 200 μm after 12 hrs.