The Evaluation Of The Recoverable Reserves In Daqing Oil Field

The original evaluation method of recoverable reserve already could not meet requirements with the development of the oilfield development technology since the Daqing oil field put into develop. Therefore this thesis analyze various application condition and applicable condition of evaluation method of recoverable reserve at home and abroad. On this basis this paper studied deeply the separate oil layer recovery efficiency using the methods of numerical simulation and statistical analysis;it also studied deeply the mechanism which the casing damage influenced recoverable reserve; The displacement characteristics curves trend and influencing factors which has an effect on enhanced oil recovery for polymer flooding block are analyzed. The main research results and understanding as follows:1. The influencing factors which effected recoverable reserve of casing damaged well are determined using real data statistical analysis in casing damaged well, Using numerical simulation study, we establish methods including water-oil ratio and recovery percent and make casing damage effecting recoverable reserve quantitative and increase storage measures effect evaluation more objective. These methods provide reliable basis for the development planning scheme compilation of oil field .2. According to the problem that reservoir physical property has big difference between Fuyang and Putaohua peripheral oilfields, we improve empirical formula of the original recovery ratio calculation formula ,and provide recovery ratio calculation formula for different oil layer. Compared with the dynamic method , calculation error of the calculation results using this formula is below 5%. Among them, the evaluation result calculation error of Fuyang oil field improved 10%.3. The determination method of separate oil layer parameters which evaluate water flooding encryption effect for tertiary oil recovery is established using many core data and indoor experimental data statistical analysis, which solves the problem of water flooding increasing recoverable reserve evaluation of infill well of tertiary oil recovery. 4. Through comparative analysis of the displacement curve in the end polymer flooding block, the recurrence adjusting method of displacement curve for evaluaterating incremental recoverable reserve is put out. We build the relationship between incremental recoverable reserve and geologic condition,injection parameter using multiple regression method and provide polyfactorial empirical statistical method for long term planning establishment. The calculation results are dependable after field experience certification.5. According the feature of geology and development in Lasaxing oil field of Daqing, this thesis provides economical recoverable reserve evaluation criterion of clascification wells and gives the economic limit determination methods of clascification wells and lays a foundation for evaluating economical recoverable reserve of clascification wells.