METHOD FOR OIL FIELD TREATMENT IN CARBONATE RESERVOIRS WITH KARSTIC PHENOMENA Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil field development, particularly to develop fields having carbonate reservoirs with karstic phenomena.

SUBSTANCE: method involves drilling production and injection vertical and horizontal wells; injecting water through injection wells; extracting product through production wells; determining areas characterized by maximal hypsometric mark fall; drilling additional horizontal and/or branched horizontal wells so that horizontal and/or branched horizontal wells are substantially parallel to contour lines of paleostructure surface; periodically changing well bore direction to search macrocrack, megacrack or karst zones; selecting production well having the highest output in well row spaced equal distances from injection well rows and using thereof as injection well.

EFFECT: increased well output, ultimate oil recovery and increased oil stock coverage with working space due to macrocrack, megacrack and karst zones usage for oil accumulation.

1 ex, 1 dwg