玉门油田鸭西区块钻井提速关键技术

为提高玉门油田鸭西区块钻井速度,降低事故复杂,结合地层特点和钻井过程中面临的地层倾角大、井眼轨迹控制困难、PDC选型难效果差、长裸眼段摩阻扭矩大、易卡钻、易井漏等技术难题,开展了钻头改型、井眼轨迹控制、减摩扭、钻井液体系优选、事故复杂防控等关键技术研究并进行现场试验。现场试验表明:改进后的PDC钻头性能稳定,机速高;优选的钻具组合和高效能螺杆能实现优快钻井达到提速目的;优化阳离子钻井液体系能有效预防事故复杂,保证有效携岩、井壁稳定和井眼润滑,助力钻井提速;优化井眼轨迹控制减摩减扭,降低摩阻扭矩,提高钻井速度。经研究形成的鸭西区块钻井关键技术为该区块的安全高效钻井提供了技术支撑。

Key technology for drilling speed in Yaxi block of Yumen oilfield

In order to improve the drilling speed and reduce the accident in Yaxi block of Yumen oilfield,combining the formation characteristics and the face of the formation with large inclination angle,difficult borehole trajectory control,poor PDC type selection,poor effect,long open hole friction torque,easy key technical problems such as stuck drilling and easy leakage,and key technical researches such as drill bit modification,borehole trajectory control,friction reduction,drilling fluid system optimization,and complex accident prevention and control were carried out and field tests were conducted.Field tests show that the improved PDC bit performance is stable and the drilling speed is high.The preferred drilling tool combination and high-efficiency screw can achieve excellent and fast drilling to achieve the speed-up purpose.Optimizing the cationic drilling fluid system can effectively prevent complex accidents and ensure effective rock carrying,wellbore stability and wellbore lubrication help speed up drilling.Optimize wellbore trajectory control to reduce friction and torque,reduce friction torque,and increase drilling speed.The key drilling technology of Yaxi block formed by research provides technical support for the safe and efficient drilling of this block.