By Louis Navellier of
Oil Stocks to BuyNewpark Resources ( NR). The drilling fluid systems and well site management company recently reported better-than-expected Q2 results on higher drilling activity in the U.S., along with increased sales related to the Deepwater Horizon spill. The company's also seen its share price explode. Year to date, the stock is up 94%. RPC ( RES). This oil field services and equipment company also recently posted some very strong second-quarter earnings results, including revenue that nearly doubled to $252.9 million during the prior year. Along with the big earnings, the company also increased its quarterly dividend by 50%. RES shares are up 75% year to date, clearly showing that buyers have embraced this stock. Superior Well Services ( SWSI). This well site solutions provider showed strong recent earnings, but the bigger news here is the company is soon to be purchased by oil and gas drilling giant Nabors Industries ( NBR) . The Nabors buyout offer comes at a near 18% premium to SWSI's share price as of Aug. 9. Considering that SWSI stock has climbed 55% year to date, it's no surprise that this winning drilling services firm gets an "A" from Portfolio Grader.