There has been a lot of volatility in the crude oil and energy sectors in recent weeks, and it appears the winners are now separating from the losers. As crude oil creeps up from lows around $75 to current levels approaching $90 a barrel, some oil stocks are cashing in – while others are failing to adapt.

I watch more than 5,000 publicly traded companies with my Portfolio Grader tool, ranking companies by a number of fundamental and quantitative measures. This week, I have seven oil, gas and consumable fuel companies to sell.

Here they are, in alphabetical order. Each one of these stocks gets a “D” or “F” according to my research, meaning it is a “sell” or “strong sell.”

Alpha Natural Resources Inc. (NYSE:ANR) is a well known coal supplier in the United States. ANR has had a terrible 2011 thus far, dropping 67% since the start of January.

Boardwalk Pipeline Partners (NYSE:BWP) is the owner and operator of three interstate natural gas pipeline systems. While other oil companies have had successful years, BWP has sided with the broader markets and is down 16% in 2011.

Canadian Natural Resources (NYSE:CNQ) acquires, explores, develops, produces, markets and sells crude oil and natural gas. Like other stocks on this list, CNQ has been outperformed by other oil stocks — as it has dropped 31%, year-to-date.

CNOOC (NYSE:CEO) produces offshore crude oil and natural gas, and is also known as an independent oil and gas exploration and production company. CEO has tailed off in 2011 to the tune of a 27% drop over 10 and a half months.

Forest Oil Corp. (NYSE:FST) is involved with the acquisition, exploration, development and production of oil, natural gas and natural gas liquids in North America. A year-to-date slide of more than 70% has shareholders looking for a stronger oil stock to buy.

Inergy (NYSE:NRGY) is in the wholesale propane supply, marketing and distribution industries. NRGY has lost 39%, year-to-date. While some oil and fuel stocks seem recession-proof, NRGY is not one of them.

Petrobras Petroleo Brasileiro (NYSE:PBR) is an oil and gas company based in Brazil. PBR may be very well known in Brazil, but a drop of almost 37% in 2011 has made the stock anything but an attractive buy.

Get more analysis of these picks and other publicly-traded stocks with Louis Navellier’s Portfolio Grader tool, a 100% free stock-rating tool that measures both quantitative buying pressure and eight fundamental factors.