Spiralling amidst a divorce and losing custody of his daughter, a man takes a dangerous job shutting down an oil refinery with a band of salt-of-the-Earth co-workers.

You should make the goal more clear in the logline. (Not too big of a criticism)

Also, the logline itself does not give off an 'Old School vibe. So you might want to add something that implies comedy in the logline.

Perhaps, instead of salt-of-the-earth, you could describe the ragtag group of refinery workers as oddball or quirky.

However, think minor changes, I believe the logline itself is almost there.

SHUTDOWN

Comps: OLD SCHOOL meets DEEP WATER HORIZON