生物质合成基钻井液性能评价

Performance Evaluation of Biomass Synthetic Base Drilling Fluid

张 弌 单海霞 李 彬 张晓刚 周亚贤 王中华

ZHANG Yi，SHAN Haixia，LI Bin，ZHANG Xiaogang，ZHOU Yaxian，WANG Zhonghua

针对油基钻井液在环境敏感地区使用受限的问题，以生物质合成基液LAE-12为油相，形成了一种密度1.2~2.5 g/cm3、抗温150℃的生物质合成基钻井液。研究了各添加剂加量对钻井液性能的影响，评价了钻井液抗温性、抗污染能力、抑制性、环保性等。结果表明，生物质合成基钻井液最优配方为：80%~100%基液LAE-12+20%~0 CaCl2水溶液+3%~5%有机土CNL+3%~5%乳化剂SMEMUL+2%~4%润湿剂RF-1+3%~5%降滤失剂FA-T+3% CaO+重晶石。该钻井液具有良好的流变性、滤失量控制能力、乳液稳定性、润滑性和抑制性，高温高压滤失量小于5 mL，抗水污染15%、抗钻屑污染20%、抗CaSO4污染15%、抗NaCl污染20%。钻屑吸附钻井液量小，钻井液的吸附损失率为油基钻井液的60%；钻井液废弃物可按一般工业固废处理，综合使用成本低。该生物质合成基钻井液无毒、易降解，满足环保要求。图3表8参14

In view of the limited use of oil-based drilling fluid in environmentally sensitive areas，the biomass synthetic base fluid LAE-12 was used as the oil phase to form a biomass synthetic base drilling fluid with a density of 1.2—2.5 g/cm3 and a temperature resistance of 150℃ . The effects of the amount of each additive on the performance of drilling fluid were studied，and the temperature resistance，anti-pollution ability，inhibition and environmental protection of the drilling fluid were evaluated. The results showed that the optimum formula of biomass synthetic base drilling fluid was obtained as follows：80%—100% base fluid LAE-12，20%—0 CaCl2 aqueous solution，3%—5% organic bentonite CNL，3%—5% emulsifier SMEMUL，2%—4% wetting agent RF-1， 3% —5% filtrate reducer FA-T，3% CaO and barite. The drilling fluid had good rheology，fluid loss control ability，emulsion stability，lubricity and inhibition. The high temperature and high pressure filtration was less than 5 mL. The water pollution resistance of drilling fluid could reach 15%，drilling cuttings pollution resistance was 20%，CaSO4 pollution resistance was 15% and NaCl pollution resistance was 20%. The amount of drilling fluid adsorbed by the drill cuttings was small，and the adsorption loss rate of the drilling fluid was 60% of the oil-based drilling fluid. Drilling fluid waste could be treated as general industrial solid waste，whose comprehensive utilization cost was low. The drilling fluid was nontoxic and easy to degrade，which met the requirements of environmental protection.

10.19346/j.cnki.1000-4092.2019.04.005