NEW YORK ( TheStreet) -- Apco Oil and Gas International ( APAGF), SandRidge Energy ( SD) and McMoRan Exploration ( MMR) were top gainers last week, while YPF ( YPF) Nexen ( NXY) and Bankers Petroleum ( BNKJF) headed the losers' list last week.Apco Oil and Gas and Sandridge Energy topped charts with gains of around 15.8% and 14.1%, respectively. McMoRan Exploration advanced 12.4% during the week on a probable takeover by Chevron ( CVX). Other prominent winners for the week include RPC ( RES) and Superior Energy Services ( SPN), up 12.2% and 10.7%, respectively. Nabors Industries ( NBR) swung 10.7% higher after named a long research tactical idea at Morgan Stanley. JX Holdings ( JXHLY) surged 9.5% after JX Nippon Oil & Energy, its refining unit, resumed operations at its Negishi refinery near Tokyo. The company restarted the 120,000 barrels per day (bpd) crude distillation unit and 150,000 bpd distillation unit. Shipments by truck have resumed, while seaborne shipments remain suspended, a company official said. Valero Energy ( VLO) rose 9.5% last week. The company restarted units including a heavy oil cracker at its Corpus Christi West refinery in Texas, a company spokesperson confirmed. Others movers include Lufkin Industries ( LUFK), Energy XXI Bermuda ( EXXI) and Comstock Resources ( CRK), each delivering gains of around 9%. EOG Resources ( EOG) advanced 8.9% after EOG Resources-Canada announced that Encana ( ECA) agreed to acquire a 30% stake in its planned natural gas liquefaction and export facility on British Columbia's west coast and the associated Pacific Trail Pipelines. EOG would sell 19% equity interest, while another joint partner Apache Canada would part 11% to Encana. CNOOC ( CEO) gained 8.7% during the week. Several analysts reiterated a buy on the stock after the company delivered results above street expectations. The company's earnings increased 85% year-over-year, driven by higher oil and gas output and realized oil prices. New fields in Nigeria and Bohai Bay contributed largely to the upsurge in oil and gas production last year, and realized oil prices climbed 28% to $77.6 per barrel. Frontier Oil ( FTO) and Santos ( SSLTY) were up 8.7% and 8.6%, respectively. Holly ( HOC) advanced 8.6% after analysts at BofA/Merrill upgraded the stock to buy from neutral.