Scientific Drilling International (SDI), a U.S. oil directional drilling firm, has been offered to potential buyers at a valuation of more than $500 million.

The prospective sale of SDI comes at a time when oilfield services firms have enjoyed some financial benefits from rising crude prices.

Private equity companies likely to aim at the SDI's business, with a goal to buy, fix it up, and take it public.

The company’s precision-drilling services operate in an advanced technology segment of a market that is projected to have $3.57 billion in revenue this year.