摘要
核桃青皮粉末相变温度为166.0℃。将其作为水基钻井液添加剂，粉末目数大于120目的降滤失作用略好。性能评价结果表明：核桃青皮质量分数由0增至1.0%，钻井液表观黏度（AV）和塑性黏度(PV)变化较小，滤失量(FL)由12.9降至7.7 mL，降滤失率达40.3%。随着老化温度的升高，核桃青皮处理水基钻井液黏度先升高后逐渐降低，核桃青皮在水基钻井液中的降滤失作用逐渐减弱，大于160℃后失去降滤失作用。核桃青皮水提取液对膨润土的水化膨胀有明显的抑制作用，钙基膨润土在0.3%、0.5%、1.0%核桃青皮水提取液中的膨胀率（1.5 h）分别为50.18%、46.10%、39.88%，低于4.0% KCl溶液的56.51%。核桃青皮加量为0.3%时，与改性淀粉的配伍效果好于聚丙烯酰胺，前者降黏降滤失，后者增黏降滤失。与杂多糖甙(KD-03)钻井液配伍效果良好，可使FL降低0.6~0.7 mL，能强化悬浮岩屑性能、滤失造壁性和润滑性。
Abstract
The phase-transition?temperature of walnut green husk powder was 166.0℃. It was used as water-based drilling fluid additive, and the filtration reduction effect of walnut green husk with powder mesh greater than 120-mesh was slightly better than that of others. The performance evaluation results showed that when the mass fraction of walnut green husk increased from 0 to 1.0%, the apparent viscosity (AV) and plastic viscosity (PV) of drilling fluids waved unremarkably, and the fluid loss (FL) reduced from 12.9 to 7.7 mL, the filtration reduction rate reached to 40.3%. As the treatment temperature increased, AV and PV increased first and then decreased, the effect of reducing fluid loss gradually weakened and lost at more than 160℃. The walnut green husk water extract could obviously inhibit hydration and swelling of clay, and the swelling ratio of calcium bentonite in 0.3%, 0.5% and 1.0% walnut green husk water extract was 50.18%, 46.10% and 39.88%, respectively, which were lower than that of 4.0% KCl solution (56.51%). When the dosage of walnut green husk was 0.3%, the compatibility effect between it and modified starch was better than that between it and polyacrylamide. The former’s viscosity and FL reduced, and the latter’s viscosity increased and FL reduced. The compatibility between walnut green husk and heteropoly glucoside KD-03 drilling fluids was favorable whose FL decreased by 0.6—0.7 mL and the ability of suspension to cuttings, filtration properties and lubricity was improved.
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