巴彦浩特探区钻井液技术初探

巴彦浩特探区钻井液工艺技术的重点是，解决疏松砂砾岩地层水涌漏同层、侏罗系地层水的HCO3^-污染及可能出现的火成岩地层井塌复杂。结合内蒙古巴彦浩特探区地层和井身结构特点，采用了两性聚合物／氯化钾钻井液和氯化钾／石膏-聚磺钻井液体系。该体系抑制能力强，性能稳定．容易实现低固相、低密度近平衡钻井，保护储层效果好。对复杂情况采取了有针对性的处理办法：平稳操作和合理的钻井工程措施是预防水层涌漏同层和火成岩井塌复杂的重要手段；用井场易得的固井水泥或石膏配合烧碱处理HCO3^-污染简便易行；处理火成岩井塌复杂，控制合适的钻井液性能是必要的。

An investigation of drilling fluid technology in Bayan Hot,Inner Mongolia

The key for drilling fluid technology in Bayan Hot area of Inner Mongolia is to solve the prob- lems of well kick and circulation loss at the same loosened glutenite layer, HCO3- contamination in the Jurassic system formation and protenial hole sloughing in igneous rock formation. Thus, amphoteric polymers/potassium chloride drilling fluid and potassium chloride/gypsum-polysulfonate drilling fluid have been used, and their performance characteristics have been presented. Investigation has shown that the drilling fluid has strong inhibition ability and its properties remain stable; by using this system, with near balanced drilling technology, the reservoir are well reserved. In addition, pertinence treatment meansures are also presented for complex accidents: smooth operation and reasonable engineering measures are thek-eys to prevent well kicks and circulation loss in the same layer and hole sloughing in igneous rock formation; using cement or gypsum mixed with sodiumhydroxide on site to cope with HCO3- contamination is effective.