Study On Economical Evaluation Method Of Reservoir Development In The Late High Water Cut Period

Currently, our country's central and eastern oilfields have successively been in the late stage of high water cut period. The oilfield development becomes more and more difficult, and the cost is becoming more and more high, the economic efficiency is not obvious. On the other hand, with China's accession to the WTO and oil corporations listing, oil corporations began to enter the international market. As the profitability of the corporation, how to maximize profits have become major problems for oil corporations.In this paper,the economical limit of reservoir development in the late high water cut period is studied.The computational method such parameters as oil well's economical limit water cut rate and output, economical limit recoverable reserves, economical limit well density, economical limit increased output of treatment and economical limit oil output per day of average single well are studied. The result gives the late high water cut period reservoir a method to judge oil well's economical effect.For the late high water cut period reservoir, to make measures to stabilize the oilfield production is an inevitable problem. The computational method of increased output of the reservoir measures in the late high water cut period is studied.The COP(cumulative oil production)-Time method is adoptd to fit the past output, and the result is effective.Three ways are given to calculate the increased output.The economical evaluation of reservoir development, which mainly refers to the economical evaluation of development program, is evaluated by GA-FCE-AHP, which adopts genetic algorithm to solve weight and to revise judge matrix. The application of GA-FCE-AHP shows its utility and validity. For convience,the software of economical evaluation is also prorammed.