连续循环阀钻井技术在番禺油田大位移井的应用

番禺油田大位移井φ215.9 mm井段钻进过程中，面临井段深、稳斜段长、稳斜角度大、岩屑易堆积、钻遇断层、钻井液安全密度窗口急剧减小、全井段采用油基钻井液钻进、黏度高、静切力大等钻井技术问题。为此，引入连续循环阀钻井技术，分析了该技术在PY10-5-A1H井φ215.9 mm井段的应用效果。结果表明，全井段1 026 m当量循环密度波动值小于2.3%，井内循环压力稳定，扭矩波动平稳，平均机械钻速高达19.30 m/h，井眼清洁状况良好，减少不必要的循环划眼和短起下钻，缩短非钻进时间，提高钻井效率，安全平稳钻过断层，未发生任何漏垮卡等井下复杂情况。总结了现场应用中出现的切换循环通道瞬间对钻杆和水龙带的冲击、MWD信号传输受干扰等问题，提出了应对措施和改进方案。

Application of Continuous Circulation Drilling in Extended Reach Wells in the Panyu Oilfield

During the drilling of φ215.9 mm extended reach wells in the Panyu Oilfield, technical difficulties are encountered, such as deep well sections, long inclined sections, large inclination angles, rock debris accumulation, faults, abrupt narrowing of the safety density windows of drilling fluids, employment of oil-based drilling fluids throughout sections, high viscosity, and large gel strength. To overcome these difficulties, continuous circulation drilling is introduced, and the application of this technique in the φ215.9 mm section of the PY10-5-A1H Well is evaluated. The results demonstrate that, when the fluctuations of the full-section(1 026 m) equivalent circulating density (ECD) are less than 2.3%, the circulation pressure within the well is stable and the torque fluctuations are steady. The average penetration rate reaches 19.30 m/h, and the hole is well cleaned. Unnecessary repeated reaming and short trips are reduced, and non-drilling time is shortened to improve drilling efficiency and ensure safe and smooth drilling through faults. No complicated downhole situations such as leakage, collapse, and blockage are observed. This paper summarizes the impacts to the drill pipes and hoses at the moment when the circulation channels are switched and problems such as the disrupted transmission of measurement while drilling signals during field application. Specific measurements and improvements are suggested.