摘要
发射换能器作为随钻方位声波测井仪的核心组件,其工作性能直接影响井周方位信息的探测精度。研究了一种适用于随钻方位测井的瓦片状声波发射换能器,利用有限元数值方法模拟了该换能器的响应特性,考察钻铤和换能器尺寸对方位声源谐振频率及水平指向性的影响。结果表明,瓦片状声波发射换能器的谐振频率随着换能器高度或开角增加而降低;钻铤以及换能器开角是影响随钻方位指向性的重要因素,存在钻铤以及减小换能器开角均使得井周方位分辨率明显提高。为随钻方位声波发射换能器设计提供了理论依据。
As the core component of LWD azimuthal tool, the radiation directivity of transducer can directly influence the detected velocity accuracy. An arcuate transducer is studied for LWD azimuthal sonic logging. We used finite element method to simulate its radiation characteristics, and the influences of collar and transmitter＇s size are investigated. Our analysis results show that resonant frequency of arcuate transducer decreased with increasing angle or height. The collar and the open angle of transducer is an important factor affecting LWD azimuthal directivity, but the collar or angle of transducer decreasing made azimuthal resolution obviously improved. It provides theoretical basis for the LWD azimuthal transducer design.
出处
《测井技术》
CAS
CSCD
2017年第3期256-259,共4页
Well Logging Technology
基金
国家自然科学基金(41474092
41604109)
关键词
随钻方位声波测井
发射换能器
谐振频率
指向性
有限元法
azimuthally LWD sonic logging
transmitting transducer
resonant frequency
directivity
finite element method
