垂直钻井系统PowerV技术首次在川西高陡构造X01井的应用效果

Application of the PowerV vertical drilling system to Well X01 in high dip structures of the western Sichuan Basin

PowerV垂直钻井技术（以下简称PowerV）是一项高陡构造直井防斜提速钻井技术，合理选配钻头、控制钻井液性能指标等成为运用该技术的关键。为此，以PowerV的结构、工作原理及钻具组合要求为指导，分析其在四川盆地西部高陡构造X01井的首次应用试验情况，该井在0316．5mm井眼的933-2757m井段实钻，PowerV钻进井段井斜小于1．2°；与常规组合的钻井相比较，钻速提高4倍；与邻井相同井段的钻井效果相比，PowerV钻具组合使用了较高的钻压和转速钻进，机械钻速成倍提高。试验结果表明：①选择性能较好的进口钻头可以节约起下钻时间；⑦使用全套固控设备的时间应占循环时间的85％以上，以保证入井钻井液性能：③要求循环系统具备较高的承压能力才能够保证PowerV垂直钻井系统对压降的基本需求。结论认为，该技术有利于高陡构造的井身质量控制，大幅度提高了钻速，具有较好的推广价值和应用前景。

The PowerV vertical drilling technology （＂PowerV＂） is a deviation-control ROP enhancement technology for vertical wells in high dip structures. Essentially, it is necessary to select bits rationally and control performance indicators of drilling fluid. In this paper, the first trail application of PowerV to Well X01 in the high dip structure, western Sichuan Basin, was analyzed in terms of its structures, working principles and BHA （bottom hole assembly） requirements. In the 933-2 757 m interval of the Ф316.5 mm hole, the deviation of the borehole drilled by PowerV is less than 1.2° and the ROP （rate of penetration） is 4 times higher than that of conventional BHAs. Com- pared with the drilling results of the same interval in the neighboring well, PowerV doubles the ROP by virtue of higher WOB （weight on bit） and RPM （revolution per minute）. Test results show that the trip time can be cut down by adopting the imported bits with better per- formance; that the operation time of complete solid control equipment should account for over 85% of the circulation period to ensure the satisfactory performance of drilling fluid in the well; and that the pressure resistance of the circulation system should be high enough to meet the basic pressure drop requirement of PowerV. It is concluded that PowerV can be used to control the wellbore quality in high dip structures and increase ROP significantly, thus having great spreading values and application prospects.