元坝地区钻头优选技术应用研究

BIT OPTIMIZATION TECHNOLOGY IN YUANBA AREA

针对元坝地区深部地层钻速慢、钻头磨损严重的问题,根据声波时差与地层岩石可钻性之间的相关性,建立了岩石可钻性的计算模型,并结合已钻井的测井数据,对元坝地区的钻头类型进行了优选研究,分析了地层岩性的可钻性级值,提出了适用于不同地层的钻头类型推荐方案。现场应用结果统计分析表明,所选钻头类型能够很好地适应于元坝地区深部地层,对于提高机械钻速和有效进尺发挥了重要作用,进一步缩短了钻井周期。该技术为元坝地区钻头类型的优选提供了重要的技术支持和参考方案。

Aiming at the problems of slow drilling rate and heavy bit wear in deep formation of Yuanba Area, according to the correlation between acoustic interval transit time and rock drillability, this paper establishes a computing model of rock drillability, and then studies bit optimization with the well-logging data from drilled wells, analyses the drillability of formation lithology, at last recommends different bits for different formations. Application result shows that the selected bit is very suitable for deep formation. Meanwhile, it plays an important role in increasing penetration rate and effective footage. Therefore, drilling cycle has been shortened. This technology provides technical supports and references for the bit optimization.