位置:成果数据库 > 期刊 > 期刊详情页
基于时域有限差分法的随钻声波测井仪隔声体隔声效果的数值模拟
  • 期刊名称:中国石油大学学报(自然科学版), 03期, 2009/6/20(中国期刊网数据库)
  • 时间:0
  • 分类:P631.814[天文地球—地质矿产勘探;天文地球—地质学]
  • 作者机构:[1]中国石油大学油气资源与探测国家重点实验室,北京102249
  • 相关基金:国家自然科学旗金重点项目(10534040);国家自然科学基金面上项目(40874097和40574049);高等学校博士学科点专项科研基金(20070425028)
  • 相关项目:非均匀各向异性孔隙地层井孔中的声场
中文摘要:

随钻测井环境下,钻铤纵模式波会严重干扰地层纵波的测量,因此需要使用隔声体来减弱钻铤波对地层纵波测量的干扰。采用圆柱坐标系下的交错网格技术,自行开发了一种可用于设计随钻声波测井仪器隔声体的三维时域有限差分程序。利用该程序数值模拟采用不同结构的隔声体时,硬地层井眼中的随钻单极子声波测井响应,并对这几种不同结构的隔声体性能进行评价。结果表明:采用不同结构的隔声体,对钻铤纵模式波的时延量和隔声量存在很大差异;与其他结构隔声体相比,周期性交错排列的凹槽结构的隔声体在测量地层纵波速度时具有较好的效果。

英文摘要:

Under logging while drilling (LWD) environment, the collar extensional wave would seriously disturb the measurement of formation compressional wave. Tbere(ore, the collar wave must be suppressed by isolator in order to measure the formation arrival. Based on staggered grid technique in cylindrical coordinates, a 3D finite-difference time-domain (FDTD) scheme was developed for simulation of isolator for LWD sonic tool. Sonic logging responses of monopole wave in the borehole of fast formation were simulated. The performances of several different isolators with complex geometrical structures were evaluated. The monopole waves for a fast formation were provided for LWD tools when the tools have different isolators. Simulation results show that for the isolators with different structures, the time delay and sound isolation for the collar extensional wave vary widely. A type of isolator with staggered cyclical grooves has better performance than any other isolator.

同期刊论文项目
期刊论文 37 会议论文 5
期刊论文 66 会议论文 2
同项目期刊论文