Nkechiyere Adaobi!
Field Petrol has long been identified as a scam and has still remained that way 4 all I can remember. Please do check the post titled "Detailed List of Noted Scammers" if u have any doubt next time. I'm sure u will find the name of the company sending u a fake job invite on the list.
http://www.naijahotjobs.com/engineer...-scams-146081/