Predicting Development Index Of Daqing Mid-Sa Oilfield At Later High Water Stage

Daqing oilfield has been in the later high water cut stage, the development became more and more difficult, the trend movement of layer series became more and more complicated, and the workload of development indexs prediction became more and more onerous. The precision of development prediction methods and math model can't content the need of development programming, especially in the situation that water-polymer drive oilfield development, upward layer polymer flooding in the second type of reservoirs during the period of the eleventh five-year plan and alkali-surfactant-polymer(ASP) flooding has dived into the industrialized application, it cry for choosing appropriate development indexs prediction methods from departed methods, lucubrating development methods furthermore aimed at newly increase production block. For the sake of advancing predicted precision and work efficiency, it need put those methods into compute programe.The paper, based on practical experience of later high water cut stage block and lease experiments, analysis and discuss the change law of main production target of polymerfooding in the main production zone(water cut, liquid production, oil production), accordingto dynamic and static data of wells in later high water cut stage industrialization block combined with numerical simulation theory calculation. The priorities are the diversification characteristics of each targetin the later high water cut stage. According to diversification characteristics of these targets, the paper based on the relationship of Hubbert model, generlized Weng model, exponential decline medol with waterflooding characteristic curve and material balance equation, build up waterplooding development prediction models. For the polymerflooding oilfield, applied generalized Weng model and Rayleigh model combined with meth model, builed up polymerflooding development prediction models. Parameters of models are calculated by the way of computer program and so that a simple, fast way have been gained to predict production target of later high water cut stage flooding. Furthermore those prediction methods are applied in Midsa blocks and can meet the demand of precision by verifying. For confirm reasonable production scale and establish scientific development plan, it also has important meaning.