摘要
综合应用动态压井系统的无隔水管领眼钻井技术是处理深水含浅层流地层地质灾害的有效手段之一。针对无隔水管钻井技术特点,进行了无隔水管领眼钻井技术在深水含浅层流地层的适应性分析。基于油气井流体力学和渗流理论,考虑了浅层流实时钻进过程中地层漏失或侵入井筒动态过程的影响,建立了无隔水管钻进的平衡方程、连续性方程、运动方程和辅助方程,为钻井水力参数的设计与求解提供了依据,并以南中国海W-X01井为例,对计算方法进行验算与对比分析。现场实例计算表明:钻井液排量、钻进速度、钻杆转速是无隔水管海水钻进过程中的主要控制性施工参数,通过施工参数可调整环空压耗大小,进而控制井底压力;环空压耗随钻井液排量的增大而增大,且领眼尺寸越小环空压耗增大的趋势越大;同时,环空压耗随钻杆转速的增大而增大。此方法可以用于指导深水含浅层流地层的无隔水管领眼钻进设计与施工。
Shaiow water flow^ （ SWF） as a kind of geologic hazard is common in riserless drilling of deepwatershallowlayer, and it is proved that riserless pilot hole drilling technology with DKDsystem is an effective method todeal with this issue, the suitability was analysed by studying the riserless pilot hole drilling technology characteris-tics to the layer witli SWF. Based on the oil well fluid mechanics and porous medium fluid mechanics, considering the influence of shallowlaminar flowin the process of the formation and the dynamic process of the wellbore,the equilibrium equation, continuity equation, motion equation and auxiliary equation were establisiied. The calculation and comparative analysis witii this hydraulic parameter calculation was conducted on W- X01 Well in South ChinaSea. The results show that the key factors of construction control when riserlesss drilling is drill fluid displacement, drilling rate and drill pipe rotation rate, and the annuli pressure loss which will affect the bottom hole pressure will change by controlling these three parameters. The annuli pressure loss will increase with the delivery rate, and it will obtain more sharp increasing trend when the wellbore is smaller, and also it will increase as the drill pipe rotation rate increases. The method could be used as a guideline when designing and conducting a riserless pilot hole drilling in deepwater layer with shallowwater flow.
出处
《科学技术与工程》
北大核心
2017年第30期28-33,共6页
Science Technology and Engineering
基金
国家自然科学基金(51434009
512742145)资助
关键词
深水钻井
浅层流
无隔水管
领眼钻井
水力参数
deepwater drilling shallow water flow riserless drilling pilot hole drilling hydraulic parameter
