皖页1HF井油基钻井液技术研究及应用

Research and application of oil-based drilling fluid technology for Well Wanye1HF

摘要:

针对皖页1HF水平井用油基钻井液性能的要求，开展了密度1.3 g/cm3和抗温120 ℃钻井液体系的优选与评价。以0号柴油为基础油，通过分析主乳、辅乳、润湿剂、有机土和降滤失剂对体系性能的影响，优选出5种因素的最优配比，并对优选配方进行了密度和抗温性能的评价，确定油基钻井液体系为主乳4%、辅乳1.5%、润湿剂1%、有机土3.5%、降滤失剂5%，该体系经过120 ℃老化16 h后，塑性粘度33 mPa·s，动切力9 Pa，平均破乳电压735 V，高温高压滤失量1.8 mL；该体系在皖页1HF井现场应用中性能稳定。

Abstract:

This paper addresses the performance requirements on oil-based drilling fluid for drilling of the horizontal well Wanye1HF. The drilling fluid system with density of 1.3g/cm3 and temperature resistance of 120℃ was optimized and evaluated. The effects of 5 main components: emulsifier, auxiliary emulsifier, wetting agent, organic clay and filter loss reducer on the system performance were analyzed to find out the optimum ratio of the 5 components. Then the density gradient and temperature gradient were evaluated for the optimum formula to determine the drilling fluid system suitable for the shale gas block. The system was applied in the field at Well Wanye1HF, and achieved good performance.