抗高温环保型有机硅钻井液的研究

利用有机硅降滤失剂研制出了抗220℃高温的环保型有机硅钻井液,并对其流变性能、降滤失性能、抗盐抗钙污染能力、抑制性能、悬浮稳定性、生物毒性和生物降解性进行了评价;利用SEM观察了有机硅钻井液滤饼的形态。实验结果表明,密度为1.16,1.50,1.90 g/cm3的3种有机硅钻井液在150～220℃下老化16 h后均具有良好的流变性能、降滤失性能和抑制页岩水化膨胀的能力,有机硅钻井液经高温老化后形成的滤饼薄而致密;在220℃下老化16 h后的有机硅钻井液具有一定的抗盐抗钙污染能力,悬浮稳定性好,生物毒性达到了排放标准,且具有良好的生物降解性。

Environmental-Friendly Temperature-Resistant Organosilicon Drilling Fluid

A new environmentally-friendly organosilicon drilling fluid with 220 ℃ temperature resistance was prepared by using organosilicon fluid loss additives.The rheological property,filtration property,salt and calcium tolerance,inhibition,suspension stability,biological toxicity and biodegradability of the organosilicon drilling fluid were investigated.The morphology of organosilicon drilling fluid filter cakes was observed by means of SEM.The results showed that the three organosilicon drilling fluids with 1.16,1.50,1.90 g/cm3density had excellent rheological property,filtration property and inhibition of the cutting hydration expansion of shale after being aged at 150-220 ℃ for 16 h,and the organosilicon drilling fluid filter cakes were compact and thin.The organosilicon drilling fluid has favorable salt and calcium tolerance and excellent suspension stability,its biological toxicity is up to discharging standard and it can be biodegraded easily after being aged at 220 ℃ for 16 h.