苏里格气田水平井S77-5-8钻井液技术

Drilling Fluid Technology of Horizontal Well S77-5-8in Sulige Gas Field

苏里格地区二叠系井壁失稳问题一直是油田勘探与开发的技术难点,采用适当密度的钻井液技术是复杂地层钻井成功的关键。通过分析该地层不稳定因素及钻井液施工技术难点,对钻井液的配伍进行改进,优选适合该地区的聚磺钻井液体系。该钻井液体系具有良好的流变性、造壁性、润滑性和抑制性。现场应用表明,该钻井液体系对该地区顺利钻进、井下安全及油气层保护有非常好的效果。

The problem of borehole instability in Dyas of Sulige region has been kept as a major difficulty in the exploration and development. The key of successful drilling of complex lithological formation is to use drilling fluid with appropriate density. This paper analyzes and researches the labile factor of Sulige region Dyas complex formation and the difficulties to the implementation of drilling fluid technology, improves the compatibility of the drilling fluid and optimized polysulfonate drilling fluid system as the appropriate drilling fluid. The drilling fluid system has good rheological, building capacity, oiliness and rejection capability. Application result shows that the drilling fluid is useful to the easy drilling, underground safety and hydrocarbon reservoir protection.