油藏物理学英文油藏物理学 (29).ppt

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1、 5)The characteristics of capillary pressure curveFig.QFig.Qualitative characteristic ofcapillarity pressure curveSwiirreducible saturation of wetting fluidPt threshold displacement pressure,corresponds to the onset of invasion of the mediumPc50 median pressure,corresponds to the nonwetting phase sa

2、turation of 50%.Mercury injection efficiency:WE=(SHgmax SHgmin)/SHgmax WE:Mercury injection efficiency;SHgmax:maximum mercury saturation;SHgmin:minimum mercury saturation The mercury injection efficiency can be regarded as the oil recovery in a strongly water-wet oil reservoir typical capillary pressure curve typical capillary pressure curve(a)Well sorted sample,with medium-size pores;(b)Nonsorted sample;(c)Well sorted sample,with large pores;(d)Well sorted sample,with fine pores;(e)Poorly sorted sample,with more fine pores;(f)Poorly sorted sample,with more large pores.