The Research Of Profile Control Effect Of New Chemical Profile Control Agent

Since Sazhong oilfield has accessed the stage of high containing water,the distribution of subsoil water and oil are getting more and more complicated. On the effect of inherent formation heterogeneity and secondary heterogeneity caused by the development of many years,intrabed and intraformational contradiction prominent increasingly,it causes injection darting of high permeability zone and containing water raised speeds up.Producing condition of poor reservoir is bad,which makes waterflood efficiency,conformance factor and final recovery efficiency low,and the development effect is bad.The technology used in this text can solve the problem,this technology can provide a strong measure for excavating the remaining oil in high water-cut stage and raising the development effect.But the initial viscosity of shallow profile modification is high, the proportion entering purpose layer is relatively low, these cause the effective radius of profile control small, and term of validity is about one year, so some injection Wells need to repeat shallow profile modification, connected oil well can not produce the desired result in a long period, and it influents and restricts the effect of shallow profile modification. So we need to research the main reasons affecting the term of validity of adjusting profile and solve it.In this context, we use new chemical shallow profile control agent to optimize laboratory experiments,physical simulation experiment,numerical simulation study and the field test, and triturate the profile control agent that has low initial viscosity and assorted injection technology, it makes response stage up to two years, integral development effect gains improvement obviously.Based on the selection and research, it can adjust absorbing capacity of high permeability zone autonomously, but it can not damage the profile control agent of low permeability zone that has high absolute viscosity, field parameters and radius of profile control are optimized, it makes that the profile control agent delay crosslinking time by shearing of drill cores with different permeability, and by reducing the injection pressure and decreasing the viscosity of profile control we can effectively improve the proportion entering high permeability zone, improve injection profile well. So it makes the term of validity of new profile control agent longer, it can be up to over two years and effect is better than conventional adjusting profile.