OIL FIELD DEVELOPMENT METHOD Russian patent published in 2007 - IPC E21B43/22 

FIELD: oil production, particularly to develop oil fields formed by thick fractured and cavernous fractured water-saturated carbonate seams with low reservoir properties, high oil viscosity and to develop terrigenous reservoirs.

SUBSTANCE: method involves serially injecting of gel-forming and deposit-forming compositions in reservoir; forcing thereof into reservoir; estimating productive reservoir thickness propagation through field thickness; determining injection well injectivity and admissible production string pressure; performing injection operation beginning from injection wells with high injectivity. The gel-forming composition is polymeric composition, which is injected in plugs beginning from 0.1-0.5% by weight polymer concentration up to 5-10% injection pressure increase. The second plug injection is stopped as polymer concentration reaches 0.5-2% by weight up to 10-20% injection pressure increase. The deposit-forming composition is alkaline agent or alkaline-polymeric composition in mineralized water presence. The deposit-forming composition amount to be injected ensures ratio between deposit-forming composition and gel-forming composition from 1:1 to 1:3 to provide 30-90% injection pressure increase. Then the composition is forced in reservoir with mineralized water having 1.0-1.2 g/cm³ density in amount of 1-3 well bore volumes. After then 1-3 day technological time-delay is exercised. Gel-forming composition for injection well having high injectivity additionally has filler taken in amount of 5-30% by weight. The filler is, for instance, mud powder, chalk or wood flour. Gel-forming composition is injected in reservoir along with simultaneous polymer supplying. The polymer is suspension and aqueous solution of crosslinker. Waste mineralized water with density of 1.01-1.2 g/cm³ is used for deposit-forming composition injection. Gel-forming composition and deposit-forming composition are injected in amount equal to fracture and cavern volume.

EFFECT: increased oil recovery due to improved strength of gel-forming layer, creation of barrier having increased structural properties along with maintenance of low-permeable interlayer permeability, simplified technology and increased technological effectiveness of oil field development, decreased material and labor inputs, as well as reduced fire and explosion hazard.

5 cl, 2 tbl