摘要
深井和超深井钻井过程中井下温度高、井内钻具承受的拉力大,导致随钻测量的井深误差较大。为此,考虑不同井深处井内温度、热膨胀系数、钻具轴向力和钻具规格等因素的影响,在测点处对井内钻具分段,结合井下温度随钻测量结果和井内钻具受力分析结果,建立了随钻测量井深的热膨胀校正模型和弹性拉伸校正模型,以及计算热膨胀校正误差限和弹性拉伸校正误差限的模型,并给出了随钻测量井深热膨胀和弹性拉伸校正后的井眼位置不确定性计算方法。实例计算表明,超深井钻井过程中由热膨胀和弹性拉伸导致的井内钻具伸长量可达10 m以上;随钻测量井深进行热膨胀和弹性拉伸校正后,可以显著减小测点垂深误差和误差椭球的大小。研究结果为提高井深随钻测量精度与科学计算井眼位置不确定性提供了理论依据。
When drilling deep and ultra-deep wells,the high downhole temperature and the large tensile force on the drilling tools in the well result in a large well depth error measured with measurement with drilling(MWD).Therefore,the influence of downhole temperature,thermal expansion coefficient,axial force of drilling tools,and specifications of drilling tools in different well depths was considered,and the drilling tools in the well were segmented at the measurement point.According to the results of the downhole temperature measured with MWD and the force analysis of drilling tools in the well,models of thermal expansion and elastic tension correction for the well depth measured with MWD were established.In addition,the models for the calculation of the error limits of the thermal expansion correction and the elastic tension correction,as well as the calculation method of wellbore position uncertainty after correcting thermal expansion and elastic tension errors of measured well depth with MWD were given.The example calculations demonstrate that during the drilling of ultra-deep wells,the elongation of drilling tools in the well caused by thermal expansion and elastic tension can reach more than 10 m.By correcting the thermal expansion and elastic tension of the measured depth with MWD,the vertical depth errors and the size of the error ellipsoid of the measurement points can be significantly reduced.The results provide a theoretical basis for improving the accuracy of well depth measured with MWD and scientific calculation of wellbore position uncertainty.
作者
刁斌斌
高德利
刘喆
吴华鹏
DIAO Binbin;GAO Deli;LIU Zhe;WU Huapeng(MOE Key Laboratory of Petroleum Engineering(China University of Petroleum(Beijing)),Beijing,102249,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2024年第2期181-186,共6页
Petroleum Drilling Techniques
基金
国家自然科学基金重点项目“复杂结构‘井工厂’立体设计建设基础研究”(编号:52234002)
国家自然科学基金面上项目“邻井套管柱对近钻头磁信标磁场分布的影响与主动磁测距井眼防碰机制研究”(编号:51974336)联合资助。
关键词
超深井
井深
误差校正
井眼位置不确定性
热膨胀
弹性拉伸
ultra-deep well
well depth
error correction
wellbore position uncertainty
thermal expansion
elastic tension
