Research On Optimization Of Tapping Technology Of Remaining Oil In XQ 45 Block

At present,the new shallow 45 fault oil field enters the high cycle stage of huff and puff,which is affected by the static,dynamic factors such as fault,reservoir physical property,steam channeling,edge water and recovery situation.There is a lot of issues such as low pressure,low daily level of single well,low oil-gas ratio,more shutting down wells,more inefficient and ineffective production wells,poor development efficiency.It is urgent to improve the development effect of reservoir,on the basis of comprehensive analysis of the production and development dynamics of the block,the fine geological model of XQ 45 block is established by using a method of combining deterministic modeling and stochastic modeling.Using numerical simulation method,the development history of the block is simulated,and the variation of temperature field,pressure field and remaining oil saturation field before and after development is simulated,and making a study of the distribution of remaining oil.According to the remaining oil genesis type,the oil wells are classified into five types of remaining oil wells: inter-layer difference type,intra-layer difference type,edge water effect type,inter-well enrichment type,and fault shelter type,and the corresponding evaluation criteria are established according to the remaining oil saturation and degree of recovery.On this basis,the remaining oil potential of the five types of oil Wells is quantitatively evaluated.Combining the remaining oil research and the actual production of the block,numerical simulation methods and reservoir engineering methods were used to formulate different measures for production measures for five types of oil wells,including nitrogen foam profile control,steam huff and puff for single layer,nitrogen assisted drainage and point steam flooding,and optimize the phase injection of steam,nitrogen foam slug size,gas-liquid ratio,foam agent concentration,steam injection speed,steam injection intensity,steam injection time and production speed and other concerned injection-production parameters.In order to obtain the maximum oil production,the oil-gas ratio greater than 0.2 is the best measure for the evaluation criteria,thus a set of supporting technologies for further improving recovery after high-cycle steam huff and puff in XQ45 block are concluded,which will provide guidance for subsequent fine adjustment and potential tapping of oil fields.