| 多极源随钻声波测井实验分析 |
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| 引用本文： | 王军,Zhu Zhenya,郑晓波.多极源随钻声波测井实验分析[J].地球物理学报,2016,59(5):1909-1919. |
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| 作者姓名： | 王军 Zhu Zhenya 郑晓波 |
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| 作者单位： | 1. 哈尔滨工业大学航天学院, 哈尔滨 150001;2. 美国麻省理工学院地球、大气与行星科学系, 波士顿 MA 02139 |
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| 基金项目： | 国家自然科学基金(41304091),国家54批博士后基金(2013M541357),黑龙江省留学归国科学基金(LC201420),中央高校基本科研业务费专项资金(HIT.NSRIF.2014028)资助. |
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| 摘 要： | 本文针对随钻声波测井中钻铤波干扰地层声波测量的问题,设计了小尺寸随钻声波测井探头,在实验室内开展了多极源(单极源、偶极源和四极源)随钻声波测井实验研究.先在水池中对裸露的探头进行了随钻测量,记录到了沿钻铤传播的直达钻铤波,并获得了不同声源激发的钻铤波速度.之后在砂岩和有机玻璃模型中进行了随钻声波测井实验,观测到多极源随钻测井的全波波形,并通过与水池中实验结果的对比,分析了井中钻铤波的传播特性.特别地,在偶极随钻测井实验中不仅记录到了偶极一阶钻铤波,还观测到对弯曲波干扰较大的偶极二阶钻铤波,进而研究了不同声源频率下该波群的响应特性及其对弯曲波测量的影响.此外,基于单极源和偶极源随钻声波测井实验数据,本文发现:随着声源频率的增加,单极和偶极钻铤波的传播特性不同,但它们在测井全波中的相对幅度均降低,进而可从测井全波中较好地提取地层的声波速度.本文实验结果对随钻声波测井仪器设计及测井数据解释具有重要意义.
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| 关 键 词： | 随钻测井 地层波速 钻铤波 频率响应 |
| 收稿时间： | 2014-10-22 |
Experimental analysis on acoustic LWD with multipole source |
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| WANG Jun,ZHU Zhenya,ZHENG Xiao-Bo.Experimental analysis on acoustic LWD with multipole source[J].Chinese Journal of Geophysics,2016,59(5):1909-1919. |
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| Authors: | WANG Jun ZHU Zhenya ZHENG Xiao-Bo |
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| Institution: | 1. Department of Astronautics and Mechanics, Harbin Institute of Technology, Harbin 150001, China;2. Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Boston, MA 02139, USA |
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| Abstract: | The acoustic logging while drilling (LWD) is an important technology in the petroleum exploration, but the collar waves propagated along the collar from source to receiver make it difficult to measure the P wave and S wave velocities. In this paper, the properties of multipole collar waves are studied from acoustic LWD experiments with a scaled laboratory detector that is built with monopole,dipole and quadrupole modes. We first measure the collar waves with a infinite liquid model when the detector is put in a water tank. The collar waves are recorded with multipole sources. Then we conduct acoustic LWD measurements in sandstone and Lucite borehole models. The frequency responses of collar waves are analyzed and compared with results obtained from the liquid model. Specially, the one and two order collar waves excited by the dipole source are recorded, their influences on the measurements of flexural wave are analyzed later. Based on the full waves measured with monopole and dipole sources, it is found that the relative amplitude of collar waves can be effectively reduced with the increasing source frequency, so that the formation waves can be measured well. This study is useful for the design of LWD detector and the data interpretation. |
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| Keywords: | LWD Formation velocity Collar wave Frequency response |
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