Study On The Production Decline Law In The Low Permeability Reservoir Of Daqing Placanticline Peripheral Oilfield

The reservoir type of daqing placanticline peripheral oilfield is complex and the heterogeneity is very strong, so daqing placanticline peripheral oilfield is a kind of boundary oil field which is difficult for water flooding, and the economic benefit is poor. With the continually embedment of water flooding, the intrinsic conflicts and problems of"low permeability, low production, low abundance"reservoirs are gradually uncovered: the poor effect of water injection, low oil recovery rate,the speedy production declining and the difficulty to stabilize oil production. Additionally, the focus of development in periphery oilfield is on the productivity construction of the new area since the start of exploitation,there is few study on the law of production decline. Therefore, in this paper we adopt theoretical analysis, statistical methods and so on, to discover the dynamic change law in oilfield production through analysis and research in detail. According to the study of development mechanism of low permeability reservoir, combining with the real production performance in oil field, we analysed the law of production declining, predicted the out put , established the composite modification method,and provided the technical data for working out the development plan of the peripheral low permeability reservoir.This paper analyse the production decline law in daqing placanticline peripheral oilfield and the influencing factors of the production decline law, establish relevant equation, and work out the weight of each index. Combining with the reality in oilfield, we put forward the approach to slower production declining, analyse the variation of production for each type of block by the numbers. According to percolation theory in low permeability reservoir,derivated the production declining equation of low permeability reservoir. Based on the geological characters of daqing placanticline peripheral oilfield, the developed blocks are described in 4 aspects. The optimizing patterns are worked out aimed at different types of block. Ultimately, we analyse the adjustment effects and potential of peripheral developed blocks,and establish the countermeasures for each type of block. Consequently, this paper provide theoretical foundation to improve the development effect of daqing peripheral developed oil field,and to slower production declining,to coach the preparation of oilfield development programming project for peripheral"low permeability, low production, low abundance"reservoirs , and to predict oilfield output effectively.