ton of jobs like that. granted, you might need a 2 yr training at a cc..
oil rigs (mentioned)
electrician
welder (insert boiler maker/pipe fitter/etc..)
machinist
tool builder
earth mover
heavy equipment operator...
sewage anything
roofer
framer/carpenter


basically anything that's dirty/indispensable and more than likely connected to oil.

cuz owns his own landscaping business; pulls 150 g's and takes home 50-60 k. Back bracking, 12 hr job though