At present time 43.4% of RUP PO Belorusneft’s reserves fall at hard-to-recover reserves. More than 90% of the latter are situated in lowpermeability carbonate reservoirs. Development of some reserves is complicated by significant heterogeneity of reservoir. Under such conditions drilling of downhole splitters not only leads to enlargement of well drainage area, but also allows to increase the probability of drilling in the formation with better porosity and permeability properties.

For low-permeability reservoirs it is necessary to perform bottomhole treatments and flow stimulation operations right after the drilling operation. Under these conditions one of the main criteria for choosing the geometry of downhole splitter is the possibility of selective entry into each of the drilled lateral holes.

Known technologies of selective entrance into lateral holes necessitate the application of additional elements during well construction. They can be realized in TAML Level 3 (or higher) downhole splitters. Besides, one needs to use casing strings of bigger diameter in comparison with those used in wells, which don’t have the system of selective conveyance of downhole tools. As a result, the cost of well construction substantially increases. Application of downhole splitter for development of reserves situated in low-permeability formation turns to be economically unvaible.

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