| 近钻头井斜动态测量重力加速度信号提取方法研究 |
| |
| 引用本文： | 张文秀,陈文轩,底青云,孙云涛,杨永友,郑健.近钻头井斜动态测量重力加速度信号提取方法研究[J].地球物理学报,2017,60(11):4174-4183. |
| |
| 作者姓名： | 张文秀 陈文轩 底青云 孙云涛 杨永友 郑健 |
| |
| 作者单位： | 中国科学院地质与地球物理研究所/中国科学院地球科学研究院(筹) 中国科学院页岩气与地质工程重点实验室, 北京 100029 |
| |
| 基金项目： | 中国科学院战略性先导科技专项（B类）课题"水平钻井高精度地质导向技术"（XDB10040100），中国科学院重点部署项目课题"随钻方位声波成像测井技术研究"（ZDRW-ZS-2016-1-1）资助. |
| |
| 摘 要： | 利用加速度计进行近钻头井斜动态测量时,钻具的高速旋转,井下强振动、强冲击环境给重力加速度测量带来极大干扰,如何从干扰噪声中有效提取重力加速度信号对于提高井斜角和工具面角的测量精度至关重要.根据重力加速度径向和切向分量为周期性信号,轴向分量为近似直流信号,离心加速度为缓慢变化信号,振动和冲击加速度为随机信号的特征,提出一种基于互相关检测的重力加速度信号提取方法,选择径向或切向磁力计信号作为参考信号.利用相关检测方法分别对仿真数据、实验室旋转测试数据和振动测试数据进行处理,并计算了井斜角和工具面角,结果表明相关检测方法可以有效提取重力加速度信号,基于MEMS加速度计的井斜角测量精度优于0.5°,工具面角变化连续平滑,满足井斜动态测量需求.通过进一步开展实际钻井环境测试,该方法有望应用于近钻头地质导向系统或旋转导向钻井系统等需要近钻头井斜动态测量的场合.
|
| 关 键 词： | 近钻头 井斜动态测量 离心加速度 振动和冲击 信号提取 |
| 收稿时间： | 2016-12-30 |
An investigation of the extraction method of gravitational acceleration signal for at-bit dynamic inclination measurement |
| |
| ZHANG Wen-Xiu,CHEN Wen-Xuan,DI Qing-Yun,SUN Yun-Tao,YANG Yong-You,ZHENG Jian.An investigation of the extraction method of gravitational acceleration signal for at-bit dynamic inclination measurement[J].Chinese Journal of Geophysics,2017,60(11):4174-4183. |
| |
| Authors: | ZHANG Wen-Xiu CHEN Wen-Xuan DI Qing-Yun SUN Yun-Tao YANG Yong-You ZHENG Jian |
| |
| Institution: | Key Laboratory of Shale Gas and Engineering, Institute of Geology and Geophysics, Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China |
| |
| Abstract: | The gravitational acceleration signals are disturbed intensively by the high-speed rotation of the drill string and strong vibration and shock in downhole harsh environment for at-bit dynamic inclination measurement. It is crucial that a method is founded to extract gravitational acceleration signals effectively from the complex interferences for improving the accuracy of the inclination angle and tool face angle. Based on the characteristics that radial and tangential components of the gravity are periodic signals, the axial component is DC signal approximately, the centrifugal acceleration signal varies with rotating speed very slowly, the vibration and shock acceleration are random signals, and this paper presents a method of correlation detection for extracting gravitational acceleration signals. The radial or tangential magnetometer signal is selected as the reference signal. The acceleration data from simulation, rotary testing and vibration testing which was collected by MEMS accelerometer have been processed. The results show that the centrifugal acceleration, vibration acceleration and shock acceleration signals are cancelled effectively. The accuracy of inclination angle is better than half of one degree and it meets the need for at-bit dynamic inclination measurement. The proposed method in the paper is expected to be applied in the fields of inclination dynamic measurement for at-bit geosteering system or rotary steerable drilling system after actual drilling environmental testing. |
| |
| Keywords: | At-bit Dynamic inclination measurement Centrifugal acceleration Vibration and shock Signal extraction |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
