Lamwila,
My best advise to you or anybody else vis-à-vis the requirements is to get in touch with Bristow or CHC international because of the current pilot shortage the goalposts keep moving.
There used to be a time where you only could get into Nigeria with at least 3500 hrs, an ATPL, twin experience and IR. Now word on the street is they are taking in expatriate co-pilots and give them a type rating as well, so get in touch and see what they requiring right now.
On the other hand also do your homework and find out what working in Nigeria really entails, don’t believe all you will read here but where there is smoke ….
All the best with your endeavours
Finalchecksplease