OIL FIELD DEVELOPMENT METHOD Russian patent published in 2006 - IPC E21B43/24 

FIELD: oil production industry, particularly for highly-viscous oil and bituminous field development.

SUBSTANCE: method involves drilling vertical production and injection wells; drilling additional holes from vertical wells; injecting working agent through additional bores of injection wells and extracting product through additional holes of production wells. Vertical flows of formation fluid are provided for low-permeable field zones development. To provide above vertical flow gently dipping additional holes are drilled from vertical injection wells in upper part of productive bed. Gently ascending holes are drilled from vertical production wells in lower parts of productive bed. Works to prevent working agent injection through vertical holes of injection wells and to facilitate product extraction through vertical holes of production wells are carried out. The works include injecting isolation materials in perforation intervals. The working agent is heat carrier agent, which is injected through gently dipping additional holes in upper part of productive bed. Product is extracted from lower part of productive bed through gently ascending holes of production wells. Heat carrier agent injection mode is defined by degree of productive bed heating and product extraction is performed with maximal differential pressure draw-down along with maintaining minimal liquid level in productive wells so that heated oil flows via gently ascending holes to vertical productive wells.

EFFECT: increased oil recovery.

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