De or het olieboring?

The correct Dutch article is:

de olieboring

Rule Words ending in -ing: almost always de. See the rule

How to use olieboring

the olieboringde olieboring
this olieboringdeze olieboring
that olieboringdie olieboring
our olieboringonze olieboring
your olieboringjouw olieboring
every olieboringelke olieboring
which olieboring?welke olieboring?
a big olieboring / the big olieboringeen grote olieboring, de grote olieboring