METHOD OF DEVELOPMENT OF WATER-OIL FIELD Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in development of water-oil fields whose producing formations have water-bearing zone. SUBSTANCE: method includes drilling of field by design pattern, dividing of wells into categories depending on thickness of transition zone or impermeable interlayer in producing formation. Wells relating to the first category with thickness of transition zone or impermeable interlayer of up to 1.5 m are used as injection ones. Wells of the second category have corresponding thickness of 1.5-3 m. Wells of the third category have said thickness above 3m. These wells are used as producing. Producing formation is tapped by perforation. Formed in wells of the second category with thickness of transition zone or impermeable interlayer of 1.5-3 m before their operation as producing ones is watertight barrier in water-bearing part of water-oil formation under transition zone or impermeable interlayer with thickness whose total value together with transition zone or impermeable interlayer amounts up to within 5 m. Oil-bearing part of formation in wells of the second and third categories are tapped with use of drilling or hydromechanical perforators. EFFECT: higher efficiency of method and saving of expenditures.