Abstract: For the high temperature and high salinity reservoir,Shengli oilfield has developed some new oil displacement systems in recent years,such as heterogeneous system and emulsion surfactant system.The oil displacement mechanisms of these new systems are obviously different from the traditional ones,and could not be described by the commercial numerical simulation software effectively;while the self-developed numerical simulation software is slow in calculation and not suitable for large-scale field application.Based on the SLCHEM,a proprietary chemical flooding numerical simulation software,we established a B-PPG throughput factor-based mathematical model of heterogeneous combination flooding and the mathematical model describing emulsification and viscosification by emulsion surfactant flooding,after the laboratory experiments and study of mechanisms.Through these models,we carried out in-lab fitting and put the models into application,verifying the rationality and accuracy of the mathematical models.In addition,the sequential implicit algorithm,the parallel algorithm and the alternating direction algorithm were applied to fast run the models of mega node scale.The efficiency test for the calculation was carried out through the conceptual model,and the results show that it needs 2.9 hours to run a model with 1 million grids,116 wells and 5 years’ production history.The laboratory test and field application show that,compared with the commercial software,the modified SLCHEM software can realize accurate fitting between the in-lab experimental results and field performance indexes of the new oil displacement systems,so it could provide effective technical support for plan optimization and performance analysis of chemical flooding.

Key words: fast solving algorithm, numerical simulation, seepage mechanism, heterogeneous phase, emulsion surfactant, chemical flooding, EOR, oil field development