| 随钻声波测井钻铤模式波衰减规律研究与隔声体设计 |
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| 引用本文： | 苏远大, 庄春喜, 唐晓明. 随钻声波测井钻铤模式波衰减规律研究与隔声体设计[J]. 地球物理学报, 2011, 54(9): 2419-2428, doi: 10.3969/j.issn.0001-5733.2011.09.026 |
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| 作者姓名： | 苏远大 庄春喜 唐晓明 |
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| 作者单位： | 中国石油大学(华东)地球科学与技术学院,青岛 266555 |
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| 基金项目： | 国家高技术研究发展计划(863)课题(2007AA6Z232),国家油气重大专项(2011ZX05020-002),中国石油大学(华东)"青年教师人才建设工程"资助. |
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| 摘 要： | 随钻声波测井技术近年来发展很快,这门技术的关键技术之一是随钻仪器的隔声设计,以保证在随钻条件下有效地测量地层的声波信号.针对普遍采用的刻槽隔声技术,本文利用三维有限差分弹性波场模拟对钻铤刻槽前、后的声波响应进行了数值模拟和理论研究.通过模拟结果的理论分析给出了钻铤波固有阻带分布规律与钻铤尺寸关系和钻铤波衰减频段与刻槽宽度、深度的关系.在此基础上,设计了一种随钻声波测井隔声体结构,给出了理论声衰减曲线和典型地层井孔中的响应特征.现场实验井测试结果表明,本文设计的隔声体结构有效地消除了钻铤直达波的干扰,能够测量到高质量地层纵波的波形和时差.
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| 关 键 词： | 隔声体 钻铤模式波 声衰减 有限差分 随钻声波 |
| 收稿时间： | 2010-11-16 |
| 修稿时间： | 2011-09-01 |
LWD acoustic color mode wave attenuation character research and isolator design |
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| SU Yuan-Da, ZHUANG Chun-Xi, TANG Xiao-Ming. LWD acoustic color mode wave attenuation character research and isolator design[J]. Chinese Journal of Geophysics (in Chinese), 2011, 54(9): 2419-2428, doi: 10.3969/j.issn.0001-5733.2011.09.026 |
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| Authors: | SU Yuan-Da ZHUANG Chun-Xi TANG Xiao-Ming |
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| Affiliation: | School of Geosciences& Technology, China University of Petroleum, Qingdao 266555, China |
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| Abstract: | The acoustic logging while drilling (LWD) technology has undergone a rapid development in recent years. A key technology of the LWD acoustic measurement is the design of an acoustic isolator to suppress acoustic propagation along the drill pipe, such that the acoustic signals from formation can be effectively measured under the LWD conditions. In order to optimize the "groove cutting" technique commonly used for the LWD isolator design, we apply a 3D finite-difference elastic-wave modeling technique to simulate and analyse the acoustic response of a drill pipe before and after cutting grooves. Analyses of the simulation results reveal the relationship between in the collar's stopband characteristics (suches as center frequency and width) and collar size, and that between collar wave attenuation and the width and depth of grooves. Based on the results, a new-type LWD acoustic isolator structure is designed, and the theoretical acoustic attenuation curve and the borehole response characteristics for typical soft and hard formation conditions are obtained. The field experiment well test results indicate that an LWD acoustic tool with the new-type acoustic isolator can suppress the interfere of collar wave and measure a high quality formation compressional-wave data and slowness. |
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| Keywords: | Isolator Collar mode wave Attenuation Finite difference LWD acoustic |
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