控压钻井井下双测点压力实时解释模型研究  

A Real-Time Interpretation Model for Downhole Pressure of Dual Measuring Points in Managed Pressure Drilling

作　　者：何淼[1] 柳贡慧[2,3] 李军[2] 李梦博 李玉洁 许明标[1] He Miao;Liu Gonghui;Li Jun;Li Mengbo;Li Yujie;Xu Mingbiao(Petroleum Engineering College,Yangtze University;College of Petroleum Engineering,China University of Petroleum(Beijing;Beijing University of Technology;CNOOC Research Institute Co.,Ltd.;Graduate School of Yangtze University)

机构地区：[1]长江大学石油工程学院,湖北省武汉市430100 [2]中国石油大学(北京)石油工程学院 [3]北京工业大学 [4]中海油研究总院有限责任公司 [5]长江大学研究生院

出　　处：《石油机械》2019年第10期1-6,共6页China Petroleum Machinery

基　　金：国家科技重大专项“涪陵页岩气水平井钻井液与固井技术研究”(2016ZX05060-015);国家自然科学基金重点项目“深水油气钻采井筒压力控制基础研究”(51734010);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”(51904034);中海油集团公司创新基金项目“基于大数据的深水钻井作业实时监测优化及精准钻井软件支持系统”

摘　　要：针对单点测量数据解释模型反演参数过于单一、不确定性问题突出及无法准确反映压力变化的问题,提出了结合无迹卡尔曼滤波技术与水力学模型的井下双测点压力实时解释模型。根据控压钻井工艺特点,确定模型的反演参数为密度校正因子和摩阻校正因子,并从理论上证明了双测点测量优于单测点测量,其反演参数更加全面。计算结果表明:双测点压力与反演参数的计算值可以根据新获取的测量值进行实时校正,其中双测点压力校正值与测量值很接近,而反演参数的计算值在其真实值附近呈小幅上下波动;反演参数的反演精度随双测点距离的增加而提高,结合工程上允许的计算误差分析,优选合理的双测点距离为30 m,这样既保证了较高的反演计算精度,同时又降低了有线钻杆的使用成本。研究结果可为井下双测点测量装置的研制与现场应用提供理论指导。Because of the insufficient inversion parameters of the single point measurement data interpretation model,the pressure change cannot be accurately revealed.To address the problem,a real-time pressure interpretation model based on downhole dual pressure measuring point data is proposed using the unscented Kalman filter method and the hydraulic model.According to the characteristics of the managed pressure drilling,the inversion parameters of the model are determined as the density correction factor and the friction correction factor.The dual measuring point is theoretically proved to be more comprehensive than single measuring point in the inversion parameters.The calculation results show that the calculated values of the dual measuring point pressure and the inversion parameters can be corrected in real time according to the newly acquired measured data.The dual measuring point pressure correction value is quite close to the measured value.The calculated value of the inversion parameter is slightly fluctuated in the vicinity of the true value.The inversion accuracy of the inversion parameters increases with the distance between the two measuring points.Combined with the calculation error allowed in the engineering,the reasonable dual measuring point distance is 30 m,which ensures high inversion accuracy while reducing the cost of using wired drill pipe.The study results can provide references and theoretical guidance for the development and field application of the downhole dual measuring point tool.

关 键 词：控压钻井 无迹卡尔曼滤波 井下双测点 实时解释 反演精度 有线钻杆 

分 类 号：TE242[石油与天然气工程—油气井工程]