supported by National Natural Science Foundation of China(10705049);Beijing Natural Science Foundation(1083011);Funding Project for Academic Human Resources Development in Institutions of Higher Learning[PHR(IHLB)]
Supported by the National Natural Science Foundation of China(Grant No.10705049);the Beijing Natural Science Foundation(Grant No.1083011);Fund-ing Project for Academic Human Resources Development in Institutions of Higher Learning[PHR(IHLB)]
Based on the structural characteristic of metal drill collar for induction logging while drilling, we have given the analytical formulae of lengthways fields Ez and Hz when the tool is located in a fan-ring shaped slo...