声波测井单极换能器的近似理论分析  

Theoretical Approximation of Monopole Transducers for Acoustic Logging Tools

作　　者：贺国芬 路涛[1] 吴迪 醋云彦 伍莹[1] 陈渝 HE Guofen;LU Tao;WU Di;CU Yunyan;WU Ying;CHEN Yu(Technology Center, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710077, China;Well Logging Key Laboratory, CNPC, Xi’an, Shaanxi 710077, China;LWD Center, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710054, China)

机构地区：[1]中国石油集团测井有限公司技术中心,陕西西安710077 [2]中国石油天然气集团公司测井重点实验室,陕西西安710077 [3]中国石油集团测井有限公司随钻测井中心,陕西西安710054

出　　处：《测井技术》2020年第2期146-150,共5页Well Logging Technology

基　　金：“十三五”国家科技重大专项“高精度油气测井技术与装备研发及应用”(2017ZX050191001);中国石油天然气集团公司重大科技专项“230 ℃170 MPa小直径测井系列研制与优化”(2019B-3707)。

摘　　要：提出一种声波测井单极换能器的近似理论模型,将换能器的振动近似等效为径向的一维振动,并根据声波波动理论与压电理论推导得到了换能器的理论响应解。在此基础上计算分析2种换能器结构的响应特性,计算结果与利用COMSOL软件的计算结果进行对比,两者基本一致,证实所提出的声波测井单极换能器近似理论模型的正确性。As the most important part of an acoustic logging tool,the transducer should be specially designed so that it can shoot acoustic wave with strong power,less noises and appropriate frequency.This paper presents an approximate theoretical model which approximates the motion of the transducer to radial 1D vibration,and solves the theoretical response based on the acoustic wave theory and the piezoelectric theory,then analyzes the influences of materials and sizes on the signals shot by the transducer,and finally analyzes the response characteristics of two kinds of transducers.The approximate theoretical model improves calculation more significantly than a finite element model.And the results almost agree with those from COMSOL software,indicating the theoretical model of monopole transducers is effective.

关 键 词：声波测井 单极换能器 近似理论模型 声压激发强度 材料 频率响应 

分 类 号：P631.84[天文地球—地质矿产勘探]