CML双梯度钻井瞬态井筒温压耦合场  

Transient Wellbore Temperature-Pressure Coupling Field in CML Dual Gradient Drilling

作　　者：张锐尧 肖平 朱忠喜[1] 李军[3] 关勤勤 Zhang Ruiyao;Xiao Ping;Zhu Zhongxi;Li Jun;Guan Qinqin(School of Petroleum Engineering,Yangtze University;Sinopec Oilfield Equipment Corporation;College of Petroleum Engineering,China University of Petroleum(Beijing))

机构地区：[1]长江大学石油工程学院 [2]中石化石油机械股份有限公司 [3]中国石油大学(北京)石油工程学院

出　　处：《石油机械》2023年第8期57-63,共7页China Petroleum Machinery

基　　金：国家自然科学基金联合基金项目“海相深层高温高压钻完井工程基础理论及控制方法”(U19B6003-05);国家自然科学基金项目“深水油气钻采井筒压力控制基础研究”(51734010);中国石油化工集团有限公司科研项目“特深层钻完井关键工具与装备”的部分研究成果。

摘　　要：针对CML双梯度钻井井筒温压耦合场的相关研究较少。为此,基于CML双梯度钻井的工艺特点,考虑井筒内钻井液的流动特点以及温度、压力对钻井液物性参数的综合影响,建立了井筒温压耦合场数学模型,并结合钻井数据进行了数值计算和敏感性分析。计算及分析结果表明:返回管线与海水之间为单管横掠式传热,受到周围环境温度的影响较大,其温度分布与海水温度分布类似,井筒温度对钻井液密度的影响要大于压力的影响;在CML钻井中,通过动态调节钻井液帽的高度可以灵活控制井筒压力;通过对钻井液帽高度、泵压、排量进行优化设计,可以更好地满足对目标井底压力的控制需求。所得结论可以为深入研究CML双梯度钻井的控压钻井工艺设计提供理论参考。The wellbore temperature-pressure coupling field in CML dual gradient drilling has been rarely studied.In this paper,based on the characteristics of CML dual gradient drilling technology,as well as the characteristics of drilling fluid flow in the wellbore and the comprehensive influence of temperature and pressure on the physical parameters of the drilling fluid,a mathematical model of wellbore temperature-pressure coupling field was built.Then,combined with drilling data,numerical calculation and sensitivity analysis were conducted.The calculation and analysis results show that the heat transfer between the return pipeline and the seawater is a single pipe cross swept heat transfer,which is greatly affected by the ambient temperature,the temperature distribution is similar to that of sea water,and the influence of wellbore temperature on the drilling fluid density is greater than that of pressure.In CML drilling,the wellbore pressure can be flexibly controlled by dynamically adjusting the height of the drilling fluid cap.Through optimization of drilling fluid cap height,pump pressure and displacement,the control requirements for the target bottomhole pressure can be better met.The conclusions provide a theoretical reference for the in-depth study and managed pressure technological design of CML dual gradient drilling.

关 键 词：CML双梯度钻井 温压耦合 数学模型 温度场 井筒压力 钻井液帽 

分 类 号：TE249[石油与天然气工程—油气井工程]