Abstract: With PetroChina entering stock market,the maximization of enterprise business value and investment capital becomes its final goal and is also requested by its shareholders. Hence,it has to optimize resource allocation and reduce cost in order to obtain maximum profit and attract capital. Carrying out benefit evaluation is just to meet this requirement of the marketed company, providing scientific basis for correct working out an annual development plan of the oilfield. This paper presents the benefit evaluation process,including the principle,standard and discriminant of evaluation and its classification, etc. In addition, the chart of economic limit can be as a guide for old field stimulation and investment decision making,and apply ioi popularization to other fields.

Key words: oilfield development, benefit, evaluation, value, management