Sometimes there will be meters at a location with a pipeline installed to it. The oil is then pumped through the meter then measured. It becomes custody of the purchaser at that point, and is now...
'Campo petrolífero' or 'Jazida petrolífera' may be Portuguese equivalents of 'oil field'.The word 'campo', which literally means 'field', is a masculine noun whose singular definite article is 'o'...