Injection Water Quality Indicators Of Low Permeability Reservoir Development

Low permeability reservoir has a high rate in all reservoirs in our country. According to incomplete statistics, the proved reserves is about 40×108 tons whose permeability is lower than 50×10-3um3 and is about 25 percent of all the proved reserves. From the "eighth five" years, there is 8.3×108 tons proved reserves had been used and produced 1000 × 103 tons of crude oil every year. It is becoming more and more important.For low permeability reservoir, waterflood development is the most popular method. In waterflooding, the quality of water injection not only has influence on the efficiency of the process system but also on the index and result of oilfield development. After the analysis of seepage flow mechanism of the reservoir, this article theoretically derivates the theory of frontal advance of low permeability reservoir water drive oil and establish the computing method and theory of water-oil relative permeability low permeability reservoir. Using volume factor adjustment, this article research the variety rule of water content in waterflood development of low permeability reservoir. On the basis of the study between water quality adaptation extent coefficient and relative permeability, this article establish the method of the water injection quality influence the index of reservoir and production well. According to this, the article studies the index of reservoir development influenced by water injection quality( area conformance factor, vertical conformance factor , volume conformance factor , oil displacement efficiency and recovery efficiency etc) and studies the variety rule of production well influenced by water injection quality( adsorption capacity, productivity index and liquid productivity index).This study presents a theory for the manufacture of the standard of water injection quality.