中国石油大学学报（自然科学版）2016，Vol.40Issue(6)：50-56,7.DOI:10.3969/j.issn.1673-5005.2016.06.006
随钻电磁波测井仪器结构影响的三维有限元模拟
Structural effects analysis of an electromagnetic wave propagation resistivity LWD tool by 3 D finite element method
摘要
Abstract
The effects of metal mandrel, coil substrate, antenna slot, antenna slot filling material, and shield cover of an elec-tromagnetic wave propagation resistivity logging while drilling(LWD) tool were simulated by a 3D finite element method. The results show that the low resistivity of metal mandrel, coil substrate, and shield cover can lead to significant electromagnetic signal reduction, whereas the effect of the slot filling material with high resistivity is nearly negligible. Under the consideration of mechanical strength, the attenuation of electromagnetic signal can be minimized via increasing the slot length, enlarging the space proportion of slot, and reducing the slot depth. The structural effects may result in nonlinear response changes with the formation resistivity;after eliminating the structural effects, the responses recover to change linearly with the formation resistivi-ty in a broad range, satifying the requirement of linear calibration. However, due to the decrease of magnetic flux in the coils after eliminating the structural effects, the tool responses may become smaller than those without the structural effects.关键词
随钻测井/有限元方法/仪器结构/电磁波传播Key words
logging while drilling/finite element method/instrument structure/electromagnetic wave propagation分类
天文与地球科学引用本文复制引用
许巍,柯式镇,李安宗,陈鹏,朱军,桑泉..随钻电磁波测井仪器结构影响的三维有限元模拟[J].中国石油大学学报（自然科学版）,2016,40(6):50-56,7.基金项目
国家油气重大专项(2011ZX05020-002) （2011ZX05020-002）
