DGJ
As SASless says, there have been quite a few in Nigeria, mostly of Bristow helicopters, but also at least one of an ACN helicopter, plus numerous failed attempts. Things have quietened down now because the situation has changed there a bit and the helicopters also changed their operating practices to lessen the chances of a hijack.
From what you say, it seems you work for Schreiner, so suggest you ask some of your company colleagues in Aero Contractors.