基于移动边界环流的连续循环抽吸压力计算方法  

A calculation method for continuous cyclic surge pressure based on moving boundary annular flow

作　　者：于志强 刘先锋 张惠军 白振超 王越之[4] 王茜 Yu Zhiqiang;Liu Xianfeng;Zhang Huijun;Bai Zhenchao;Wang Yuezhi;Wang Xi(Bohai Driling Engineering Research Institute,CNPC,300280,Tianjin,China;Korla Branch of Bohai Drilling Engineering Co.,Ltd.,CNPC,84000,Korla,China;No.5 Dilling Branch of Bohai Drilling Engineering Co.,Ltd,CNPC.062465,Hejian,China;School of Petroleum Engineering,Yangtze University,430100,Wuhan,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司工程技术研究院,天津300280 [2]中国石油集团渤海钻探工程有限公司库尔勒分公司,库尔勒841000 [3]中国石油集团渤海钻探工程有限公司第五钻井工程分公司,河间062465 [4]长江大学石油工程学院,武汉430100

出　　处：《应用力学学报》2020年第3期1375-1380,I0032,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51874045)。

摘　　要：连续循环钻井液技术可以减缓起钻过程中的抽吸压力,针对连续循环技术在起下钻过程中的应用,基于N-S方程理论和非牛顿流体流变规律,建立了考虑移动边界环流起下钻过程中抽吸压力的计算模型;并分析了起钻速度和钻井液循环流量对抽吸压力的影响规律,对深井起钻过程中抽吸压力控制进行了初步探讨。研究结果表明,在深井起钻过程中使用连续循环技术适当地泵送钻井液能够减小抽吸压力,有助于在不增加抽吸压力的情况下提高起钻速度,节省起下钻时间。建立的连续循环条件下的抽吸压力计算方法可为深井和窄密度窗口井起下钻过程中的最优泵量设计及起下钻速度的提高提供理论参考。Continuous circulating drilling fluid can slow down the surge pressure while tripping.In order to know the surge pressure changes caused by continuous circulation while tripping,a calculation model of surge pressure during tripping is established with a moving boundary annulus flow based on the N-S equation and the rheological law of non-Newtonian fluid.The influences of tripping speed and flow rate on swab pressure are analyzed,and the swab pressure control during deep drilling is discussed.The research results show that the swab pressure can be reduced by proper pumping drilling fluid while deep well tripping.There is drilling fluid circulation in tripping,which can improve the drilling speed without increasing swab pressure and saving a lot of tripping time.The established continuous cycle surge pressure calculation method can provide a theoretical reference for designing the optimal pump volume and improving tripping speed in deep well and narrow density window well.

关 键 词：起下钻 压力波动 循环并起下钻 窄安全密度窗口 超深钻井 

分 类 号：TE21[石油与天然气工程—油气井工程] TE242