摘要
提出一种在钻铤上切割周期性轴对称凹槽方式构建隔声体,消除钻铤模式波的方法.结果表明,其隔声效果与凹槽深度H、长度L、凹槽数目N、凹槽截面形状以及钻铤壁厚有关.选择矩形截面凹槽、减小钻铤壁厚、增加凹槽深度都可有效提高隔声体的隔声效果,该结构最高可获得约36 dB的声衰减,基本满足随钻声波测井仪器对隔声效果要求.
A sound isolator with axisymmetric periodic groove structures is given for eliminating drill collar wave.Sound isolation effect with different groove’s depth(H),length,number,section shape and thickness of the drill collar is studied.With rectangle section shape,decreasing thickness of the drill collar and increasing H,isolation effect of the acoustic isolator can be increased.It can get a maximum of 36 dB sound attenuation which meets requirement of the sound isolator in LWD.
出处
《计算物理》
EI
CSCD
北大核心
2010年第6期869-876,共8页
Chinese Journal of Computational Physics
基金
国家高技术研究发展计划(2007AA06Z232)
中国石油科技创新基金(2009D-5006-03-03)
山东省自然基金(ZR2009EL006)资助项目
关键词
随钻声波测井
隔声体
周期性结构
钻铤波
logging while drilling
acoustic isolator
periodic structure
drill collar wave