Oil-rim reservoirs contain 13% of all oil reserves in the Russian Federation and refer to hard-to-recover oil reserves. Low initial saturation and features of the geological structure make it difficult to use traditional methods of maintaining reservoir pressure. The work with sweep efficiency takes now the first place and drilling multilateral wells plays a key role at this area. The main oil reservoirs of Novoportovskoye oil and gas condensate field refer to oil-rim reservoirs of subjacent and flanking types. The ratio of Gas Cap Pore Volume to Oil Rim Pore Volume is 1:1. Based on the development experience of Novoportovskoye oilfield it is observed a continuous dynamics of the increasing horizontal part of wells from 1000 to 1500 and 2000 meters. The developing of simple and reliable domestic technology gave impetus to increasing of total horizontal part of wells to 4000 meters, which was successfully realized at well No.2116. The drilling of multilateral wells at oil-rim reservoirs allows increasing of sweep efficiency. Adaptation and application of Russian technologies with cost lower than their foreign analogues leads to well productivity increasing by 50% and NPV increasing by 45%.
New perspectives of application of development systems with multilateral wells open up. And it will allow developing even more complex low permeability oil reservoirs with gas cap.
