特深孔钻探时间影响因素分析

Analysis of factors affecting the time of extra-deep hole drilling

摘要:

为提高深孔与特深孔钻探效率，本文根据钻探工艺时间分配建立了钻探时间利用率模型，并结合该模型定量分析了13000 m特深孔钻探中绳索取心与提钻取心两种工艺下各因素对钻探时间的影响。分析表明，无论采用绳索取心还是提钻取心工艺，回次进尺长度均是影响钻探时间的首要因素，但其后各影响因素的排序存在差异：前者依次为钻头寿命、立根长度及起下钻速度，后者则为立根长度、起下钻速度及孔口坐卡与拧卸时间。研究进一步证实，绳索取心钻进效率显著优于提钻取心，但通过优化回次进尺长度等关键参数可有效缩小二者间的差距。本研究揭示了特深孔钻探时间的关键影响因素及优化路径，为工艺方法评价和钻进效率提升提供了理论依据。

Abstract:

To enhance the efficiency of deep and extra-deep hole drilling， this study established a drilling time utilization model based on the time allocation of drilling processes. Using this model， we quantitatively analyzed the impact of various factors on drilling time for a 13000 m extra-deep hole， comparing wireline coring with conventional coring. The analysis reveals that regardless of the drilling method， penetration per round trip is the primary factor influencing drilling time. However， the ranking of subsequent factors differs： for wireline coring， the key subsequent factors are bit life， drill-pipe stand length， and tripping speed， in that order； for conventional coring， they are drill-pipe stand length， tripping speed， and wellhead handling time. The study further confirms that wireline coring is significantly more efficient than conventional coring， but the performance gap can be effectively narrowed by optimizing key parameters such as penetration per round trip. This research reveals the critical factors and optimization pathways for drilling time in extra-deep hole drilling， providing a theoretical foundation for the evaluation of drilling methods and the enhancement of drilling efficiency.