A man that marries a rich/wealthy woman and uses her for her material and monetary benefits. A man that cares more about his wife's/woman's bank account than he does about the woman.
The female equivalent is the common term "Gold Digger."
An Oildriller can be a young, good looking guy in La Jolla that provides for his recent divorcee wife in "many" ways, but does not actually love her. He is there for her whenever and benefits off her recently settled prenup bank account