The tumble of the oil price brings huge impact on oil production and operation of the oilfield enterprises. There is confusion among many oilfield enterprises about how much oil should be produced for the sake of the most economic benefit. Aimed at the problem that method of determining benefit output is lack of standard，profit-benefit output model，cash flow-benefit output model and marginal revenue-benefit output model were established starting from the cost attribute and benefit evaluation. The evaluation of the benefit output of an oilfield was taken as an example. At oil prices of 50 $/bbl，the benefit output calculated from the three models was 310×104，1 967×104 and 2 416×104 t，respectively. The influence of the benefit output obtained from the three models on the production and operation of oilfield enterprises at different oil prices was analyzed. It was pointed out that oilfield enterprises should make different management strategies according to different oil prices. At high oil price，the profit-benefit output model should hold the leadership role with emphasis on development.At low oil price，the marginal revenue-benefit output model should hold the leadership role with emphasis on survival.Maintaining rational production scale is the basic for oilfield enterprise to survive and develop sustainably.