Research On The Variation And Prediction Of Oil Production Rate Of Low Permeability Oilfields

Daqing periphery developed oilfields are reservoirs of low permeability, low production and low abundance, as marginal fields with poor economic benefit and great water flooding development challenges. With further water flooding development, more inherent issues and problems gradually emerge than normal oilfield,such as scattered remaining oil distribution,water cut rising quickly ,production declining quickly,bad water injection responsing,low oil production rate and disable effectively driving. For economically,rationally and effectively development of the Daqing periphery developed oilfields,it is very necessary to analyse the water flooding character and the output variation. Since the low permeability reservoir has threshold pressure,we should take it into account in the analysis.In this paper, according to the geological features and production performance of the Daqing periphery developed oilfields, the developed reservoir are divided into four comprehensive categories and researched based on reservoir geological classification, development level classification and development degree classification. Basing on the characteristic of low permeability reservoirs, the applications of different types water flooding characteristic curves and oil rate prediction models in low permeability reservoir are studied systematically. Some influence factors of the oil output variation analysis are deeply discussed,the rational descriptions accord with fact are gained for different types developed reservoires. The water flooding the variation and Prediction of oil production rate of different types developed reserviores are analysed systematically,meanwhile the preferential models of production forecast for different types developed reservoires are presented. With this understanding integrated the water flooding characteristic curves method and oil rate prediction models,the development indexes are forecasted for representative reserviores. It is indicated that the result of predication is reasonable. It provides evidence for formulating oilfield development project design and water flooding adjustment in Daqing periphery developed oilfields.