摘要
在实钻测井中,复杂的作业环境(仪器旋转、井眼倾斜、井眼不规则等)导致钻井液间隙无规律变化,而随钻密度成像仪测量精度对钻井液间隙变化非常敏感,传统的补偿密度校正算法已经很难满足日益复杂的实钻环境。随着地层评价要求的不断提高,在前人提出的井径加权和采集时间加权技术基础上,基于仿真和仪器实验数据对传统补偿密度算法和井径加权算法的测量精度进行了验证性研究。结果表明,井径加权校正算法要优于补偿密度校正算法,模拟仿真的测量误差减少了约37.5%,刻度实验测量误差分布更为集中。现场试验表明,同时采用采集时间加权技术和井径加权技术,钻井液间隙为0~15 mm时的校正量为±0.01 g/cm^(3)、钻井液间隙为15~20 mm时的校正量为±0.02 g/cm^(3),可有效抵消无规律的井眼尺寸变化带来的测量误差。
In real drilling,complex operating environment(such as rotation,wellbore inclination,irregular borehole,etc.)leads to irregular changes in mud gap.The measurement accuracy of density imaging tool while drilling is very sensitive to the change of wellbore gap.The traditional compensation density correction has been difficult to meet the increasingly complex real drilling environment.With the requirement of stratum evaluation increasing,the caliper weighting and acquisition time weighting techniques have been put forward.Based on the Monte Carlo simulation and calibration experiments,the traditional compensation density algorithm and caliper weighting algorithm are studied and verified.The results show that the correction of caliper weighting algorithm is better,the error of simulation data is reduced by about 37.5%,and the error distribution of calibration data is more concentrated.The field experiment shows that the correction range is±0.01 g/cm^(3)when the mud gap is 0~15 mm,and±0.02 g/cm^(3)when the mud gap is 15~20 mm,which can effectively offset the measurement error caused by the irregular wellbore.
作者
安旅行
陈辉
骆庆锋
岳爱忠
AN Lyuxing;CHEN Hui;LUO Qingfeng;YUE Aizhong(Logging Technology Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China)
出处
《测井技术》
CAS
2023年第1期1-6,共6页
Well Logging Technology
基金
中国石油集团测井有限公司课题“随钻孔隙度系列优化升级与集成配套”(CPL2021A02)
中国石油集团测井有限公司课题“测井仪器环境校正方法及图版配套与软件开发”(CPL2022-9C01)。
关键词
井径加权技术
采集时间加权技术
随钻密度成像仪
蒙特卡罗
地层密度
caliper weighting technique
acquisition time weighting technique
density imaging tool while drilling
Monte Carlo
formation density
