小井眼超深井井筒温度预测模型及降温方法研究  

Research on Wellbore Temperature Prediction Model and Cooling Method of Ultra-deep Well with Small Hole

作　　者：刘涛 何淼[1,2] 张亚 陈鑫 阚正玉 王世鸣 LIU Tao;HE Miao;ZHANG Ya;CHEN Xin;KAN Zhengyu;WANG Shiming(School of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,China;Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan,Hubei 430100,China;Jingzhou Jiahua Technology Co.,Ltd.,Jingzhou,Hubei 434000,China;Tianjin Huizhu Petroleum Equipment Technology Co.,Ltd.,Tianjin 300350,China;Tianjin Key Laboratory of Oil,Gas and Geothermal Completion Tools,Tianjin 300350,China)

机构地区：[1]长江大学石油工程学院 [2]油气钻采工程湖北省重点实验室•长江大学 [3]荆州嘉华科技有限公司 [4]天津汇铸石油设备科技有限公司 [5]天津市油气与地热完井工具重点实验室

出　　处：《钻采工艺》2024年第3期65-72,共8页Drilling & Production Technology

基　　金：国家自然科学基金青年项目“基于数据驱动的深水钻井溢流智能识别与反演解释研究”(编号:51904034)。

摘　　要：顺北区块超深小井眼钻井井底高温问题突出,明确井筒温度场分布规律并探讨高效降温方法对于保障该地区钻井安全具有重要工程意义。文章基于超深小井眼钻井工艺,综合考虑钻井液黏性耗散、钻柱偏心和旋转及钻头破岩等多种热源项对井筒温度的影响,建立了适用于小井眼超深井的井筒瞬态传热模型,并提出针对性的降温方法,然后采用MWD实测数据及商业软件Drillbench进行对比验证,本模型预测值与随钻数据更为吻合,误差在2%以内;钻柱隔热可降低井底温度33℃,钻井提速、增加排量等其它方法可使井底温度降低3~10℃,采用地面降温法的降温效率呈现显著的边际递减效应,即井越深其降温能力越有限。针对单一降温方法降温效果不够显著,建议综合多种降温方法有效降低井筒温度。本研究成果可为小井眼超深井的井筒温度准确预测和降温方法优选提供理论指导。The problem of bottom hole high temperature is prominent in the ultra-deep small hole drilling in Shunbei block.It is of great engineering significance to clarify the distribution law of wellbore temperature field and explore efficient cooling method to ensure the drilling safety in this area.Based on the ultra-deep small hole drilling process,this paper established a transient wellbore heat transfer model suitable for ultra-deep small holes using measured MWD data and commercial software Drillbench for comparison and verification,considering the effects of various heat sources such as drilling fluid viscosity dissipation,drill string eccentricity,rotation and bit rock breaking on wellbore temperature.The predicted value of this model is more consistent with the data while drilling,and the error is less than 2%.The results show that the thermal insulation of drill string can reduce the bottom hole temperature by 33℃,and other methods such as drilling speed and displacement can reduce the bottom hole temperature by 3~10℃.The cooling efficiency of surface cooling method shows a significant marginal decreasing effect,that is,the deeper the well,the more limited the cooling capacity.At present,the cooling effect of single cooling method is not significant enough,so it is suggested to combine multiple cooling methods to effectively reduce the wellbore temperature.This study can provide theoretical guidance for accurate prediction of wellbore temperature and optimization of cooling method in ultra-deep wells with small holes.

关 键 词：井筒温度场 小井眼 降温方法 超深井 

分 类 号：TE246[石油与天然气工程—油气井工程]