| 摘要 |
DOWNHOLE DETECTION 5 A system for use in downhole detection comprises a downhole arrangement defining a throughbore and a tool deployable through the throughbore of the downhole arrangement. The system further comprises a primary electromagnetic element provided on one of the downhole arrangement and the deployable tool and a secondary electromagnetic element provided on the other of the downhole 10 arrangement and the deployable tool, wherein the primary and secondary electromagnetic elements are configurable for electromagnetic coupling therebetween. Such a system may be used for determining a status and/or an identity of a downhole tool in an oil or gas well from a determined degree of electromagnetic coupling between the primary and secondary electromagnetic elements. The abstract to be accompanied by Figures 1(a) and 1(b) when published. N '-N- U'-' "N~~ 'N N" -K ~*'~ <N ""-'4) N. fl'>' ~fl p -.. 2' I H' <N. ~ U, N H "'N '~ ~' z -'N NS ~ ~ H IL I H -'N-' I' N, ~ -N-- '/ ''N.4 &N$N "-"4'4-~ N N, '~' N, * N '~ v*t~ A' N ~ 'N, ~--'4j~ < ~j~ -~ L S |
