The article describes an experience and technologies of heterogeneous Ryabchik formation AV11-2 development. Nine zones specified by the character of layers composing reservoir, depositional environment and involvement of areas into development. Permeability of zones modifies from 0,005 to
0,081 μm2. Main volume (over 90%) of remaining oil in place concentrated in medium and low-permeable zones (permeability coefficient is 0,005–0,007 μm2). For the purpose of development efficiency improvement, multistage hydraulic fracturing and drilling of horizontal wells up to 2000 m realized. Performance of hydrofrac is complicated by the presence of underlying high-productive water-saturated АВ13 formation. Hydrofracturing AV11-2 rises probability of fractures penetration into АВ13 formation. Reduction of fracture height realizes by low-volume hydrofracturing with non-crosslinked gel. This technology allows to cut fracture height in 30-60% in comparison with hydrofrac on crosslinked gel at similar proppant loading. Small-volume hydraulic fracturing on non-cross-linked gel is used to reduce the fracture height. Advanced technology of drilling in the reservoir with multilateral wells was tested in areas with contact reserves. In the zone of highly productive reservoirs, tertiary methods of enhanced oil recovery are successfully applied. Water-cut in production wells in these zones is 96-98%. To rise formation productivity sludge-forming, gel-forming and fiber-dispersed compositions are pumped into injection holes.
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