The Study Of Profile Control With Jel Foam

Secondary recovery has been an important enhanced oil recovery method adopted at the later stage of oilfield development in China. However, due to the effect of reservoir heterogeneity,there is still about 40%-50% remaining oil kept in oil-bearing formation after polymer flooding, and how to further enhance recovery factor and keep the oil-field sustained development has become the focus of research at present. For enhance the sweep efficiency ,this paper develops the jel foam profile control technology, and the jel foam profile control technology is an new effective improved oil recovery method for heterogeneous reservior at the later stage of development, and a series of studies has been done in recent years. But it is at development stage and needs deep study in mechanisms of foam flow in porous media, influential factor and applicability. Wherefore, it is very necessary to further study the jel foam flow in heterogeneous reservoir and the effect of jel foam flooding.Based on foamer's foaming ability and stability, through laboratory experiment, several foamers used in oil field were evaluated through experiment, and affecting factors of foaming ability and stability is analysed. Based on gelation time and gelation intensity, through laboratory experiment, 4 crosslinkers were evaluated and one selected which can cross-link in 4 days and the hardness can reach D degree.Through physical model, the effects of gas-liquid ratio and permeability on jel foam flow law in porous media were studied systematically. With the gas-liquid ratio increasing, the jel foam breakthrough pressure in porous media decrease but still can be more than 8Mp/m when the gas-liquid ratio under 1:1. Under certain gas-liquid ratio and injection speed, the jel foam breakthrough pressure in porous media decrease with the permeability increasing.Through simulating heterogeneous reservoir with different permeability contrast, the jel foam profile control technology is proceed. we compared two injection system and then the effect on mobility regulatory of jel foam in heterogeneous reservoir caused by permeability contrast is analysed.