The Sabanchinskoye oil field was discovered in 1963, commercial production started in 1973 with waterflooding. The carried out research allowed the several conclusions. In the Sabanchinskoye oil field characterized by complex geology and heterogeneity of oil reservoirs, a combined waterflooding system proved to be effective. This system involves perimeter waterflooding and regular waterflooding, in the latter, line drive waterflooding dominates. Line drive waterflooding of the Sabanchinskoye oil field Bobric formation makes it possible to maintain formation pressure at a level of ±10 % of the original in-situ pressure, to attain the planned oil recovery in the drilled blocks, and to develop oil reserves from bottom to surface. Application of various EOR methods improved displacement efficiency and allowed drainage of by-passed zones. The fourth stage of the field development witnessed decrease of effectiveness of production enhancement operations. This means that the waterflooding process has to be optimized, cyclic waterflooding has to be considered, operation modes need to be changed, and innovation technologies have to be applied on a field scale.
Cyclic waterflooding was carried out in one experimental and five pilot blocks of the Sabanchinskoye field Bobric formation. The injection volumes were changed, and the period of half-cycle was extended to 20 days. For two years of pilot production, 35000 tons of additional oil were extracted, produced water decreased by 885200 tons.
For the first time since 1984, the production decline curve was on the up, and from the year-earlier period (2014), oil production from the field increased.References
1. Khisamov R.S., Khabibrakhmanov A.G., Yartiev A.F. et al., Sabanchinskoe
neftyanoe mestorozhdenie: istoriya, analiz razrabotki, perspektivy (Sabanchinskoye
oil field: the history, development analysis, perspectives),
Kazan’: Ikhlas Publ., 2016, 320 p.
2. Patent no. 2471971 RF, MPK E 21 V 43/20, Development method of nonhomogeneous
oil deposit, Inventors: Bakirov I.M., Idiyatullina Z.S.,
Bakirov A.I., Ramazanov R.G., Nasybullin A.V., Vladimirov I.V.
