【摘要】 塔里木盆地玉北地区储层损害机理主要表现为碱敏程度中等偏强,储层水锁损害严重。针对以上损害机理,通过加入理想充填暂堵剂、无荧光仿沥青和超低渗透成膜剂,形成了钻井液优化配方,其高温高压滤失量可降至小于12 mL,岩心渗透率恢复值可达85%以上,达到储层保护的要求;建立了暂堵剂粒度分布与储层裂缝宽度上限值之间的匹配关系:当缝宽上限小于150μm可使用超细碳酸钙;当储层缝宽上限值大于150μm之后,应使用超低渗透成膜剂和无荧光仿沥青。玉北5井和玉北9井的现场试验表明,所使用的优化四开钻井液性能优良,井浆的岩心渗透率恢复值达到87%以上,对储层的保护达到预期效果。更多还原

【Abstract】 To protect the reservoirs in block of Yubei Tarim basin that are of high alkali and water sensitivity,the temporary sealing additives,bloomless asphalt and ultra-low penetration additives are applied to form a drilling fluid formulation,which the HTHP filtration rate is less than 12 mL,the core penetration recovery rate is over 85%,and the relationships between temporary sealing particle size distribution and fracture width are ultra-fine calcium carbonate can be used while the largest fracture width is less than 150 um,and if the largest fracture width is more than 150μm,the bloomless asphalt and ultra-low penetration additives can be applied.The applications in well Yubei5 and Yubei9 show that the core penetration recovery rate is over 87%,which can protect the reservoirs effectively.更多还原