深水钻井液关键技术研究

Research on Deepwater Drilling Fluids Key Technology

分析了深水钻井液面临的技术难题,认为深水钻井所面临的主要问题有深水低温问题、深水浅层含气砂岩所引起的气体水合物生成问题、海底泥岩稳定性问题及钻井液用量大、井眼清洗困难等问题。根据深水钻井中出现的问题和面临的困难,指出了深水钻井液应具有良好的低温流变性、悬浮携岩能力、页岩稳定性、环保性能及综合成本低等特点。调研了国外常用的深水钻井液体系,研制了深水钻井液水合物抑制性评价试验装置,探讨了深水钻井液中水合物的形成规律及机理,优选了深水钻井液用水合物抑制剂及其配方。在优选深水钻井液用处理剂的基础上,得出了深水钻井液的最终配方,并进行了全面的性能评价。最后,根据我国深水钻井液技术研究的现状,提出了下一步的研究重点。

The technical problems of deepwater drilling fluid were analyzed based on the research on key technology in deep water drilling and completion＇,a National High Technology Research and Devel opment Program of China. The main problems are believed to be low temperature rheology control, the hydrate formation from natural gas in shallow sand formation, the shale stability of sea bed, the large consumption of drilling fluid and the difficulty in borehole cleaning. The performance and characteristic of deepwater drilling fluids are described. The research on deepwater drilling fluids abroad was investigated. An experimental equipment to evaluate deepwater drilling fluid hydrate inhibition was developed. The development and mechanism of hydrate formation in deepwater drilling fluid was discussed. Deepwater drilling fluids hydrate inhibitors was optimized. The formula for deepwater drilling fluid was obtained and its performance was evaluated comprehensively. According to the study of deepwater drilling fluid technology status ,research priorities for next step was suggested.