NEW YORK (TheStreet) - Petrohawk Energy (HK), Bill Barett (BBG), Comstock Resources (CRK) and Forest Oil (FST) clocked smart gains during the past week, while Core Laboratories (CLB), Energy Transfer Equity (ETE), Lufkin Industries (LUFK) and TransAtlantic Petroleum (TAT - Get Report) fared badly.

Among the advancers for the week, Petrohawk Energy topped the charts, gaining 63%. Bill Barett jumped 17%. Bill Barett stock was raised to outperform at Wells Fargo.

Comstock Resources rose 15.7%, Forest Oil Corporation edged up 15.2% and Pioneer Natural Resources ( PXD - Get Report) moved up 14.3%.

Range Resources ( RRC - Get Report) advanced 14.4% after the management announced an 8% increase in second-quarter production volume from the prior year quarter and a 10% boost in 2011 production. Meanwhile, the company's price realization for the quarter increased 11%.

Other movers were Pioneer Natural Resources ( PXD - Get Report), up 14.3%, while Cabot Oil & Gas ( COG - Get Report) rose 14% and Berry Petroleum Company ( BRY) improved 13.3%.

EQT Corporation ( EQT - Get Report) edged up 12.7% after the stock was raised to outperform from neutral at Robert Baird with a price target of $66 per share.

Chesapeake Energy ( CHK - Get Report) moved up 12.5% and Bloomberg reports that the company is likely to announce a new natural gas discovery in the Utica Shale formation shortly.

Oasis Petroleum ( OAS - Get Report) advanced 12.4% and Whiting Petroleum ( WLL - Get Report) increased 12.3%.

Stocks like Swift Energy ( SFY), Denbury Resources ( DNR - Get Report), Nabors Industries ( NBR - Get Report) and Gran Tierra Energy ( GTE - Get Report) gained more than 10% during the week.

Southwestern Energy ( SWN - Get Report) soared 11% after the stock's target price was raised to $57 per share from $48 at Howard Weil.

Core Laboratories was the top laggard, down 5.8%, while Energy Transfer Equity lost 4.5%, Lufkin Industries erased 3.8% and TransAtlantic Petroleum reduced 3.2%.

CNOOC ( CEO) trimmed 3.2% as the company intends to purchase Opti Canada, an oil-sands producer. Jefferies Group believes that it is a high-risk buy for CNOOC. The brokerage values Opti's production at about $275,000 per barrels per day and estimates proved and probable reserves at $3.54 a barrel.

Energy Transfer Partners ( ETP) fell 2.9% after S&P cut the company's outlook to negative from stable.

Other losers included Frontline ( FRO - Get Report), Spectra Energy Partners ( SEP), Teekay Offshore Partners ( TOO - Get Report), Targa Resources Partners ( NGLS) and Williams Partners ( WPZ).