Nowadays the problem of increasing oil recovery factor from the reservoirs being at the late stage of their development is a very acute one. Basing at the example of high-permeable pay of Bobrikovskian horizon saturated with high-viscous oil we illustrate the efficiency in applying the enhanced fluid recovery methods. It is scientifically proved that the procedure of fluid forced recovery (FFR) is one of the most effective and efficient methods in stimulating oil recovery and reducing the fluid rate drop; this procedure also gives the increase in reservoir sweep displacement efficiency. But the nature of reservoir physical and chemical properties, the parameters of well water-cut, at what stage of reservoir development we can get the highest process effect while using the methods of FFR as well as the influence of FFR upon the oil recovery rate are still in doubts by now.
The procedure used at the considered object was initiated at the end of drilling-out stage, when we have seen the significant drop in oil productivity rate and faced the problem of high water-cutting at the stage of oil production. The application of FFR procedure from wells and the growth in oil water-cut quickly enabled to neutralize the effect of water-oil mixture viscosity growth in a process of its displacement. The method to evaluate the FFR efficiency through the multiple oil and fluid production rate increase verifies its high practical application effectiveness. Application of FFR procedure at all the stages of object development process enabled not only to increase well productivity rates and, respectively, annual oil production rates, as is proved by extrapolation empirical method of field development monitoring, but also to increase oil recovery factor. The confidence in geological structure, the amount of OOIP in considered reservoir, the detailed study of object heterogeneity and adequate evaluation of physical and chemical properties of reservoir fluid permitted us to use a set of hydro-dynamic development methods at pay B-2, including water-flooding, FFR and horizontal bore-hole drilling that finally resulted in reaching high oil recovery factor.
References
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