METHOD OF DEVELOPMENT OF CARBONATE RESERVOIR WITH WATER-OIL ZONES Russian patent published in 2016 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: method of development of carbonate reservoir with water-oil zones involves drilling of horizontal wells, running on the pipe string to horizontal part of shafts of pumps and filters, determining the profile of oil inflow to the well shaft, acid treatment of the collector, withdrawal of production well. Profile of the horizontal hole is in the central part of the header, into open horizontal borehole is run in two pipe strings with diameter 1.5-2 inches, strings are telemetrically oriented one above another. One or more series-connected pumps are installed on the lower string in the centre of the shaft. On the upper string along the whole length of the barrel are arranged in-series connected filters, perforation holes of which are located along one line along the length of filters, these holes are telemetrically oriented towards the bed roof. Packer is installed higher than reservoir roof in the casing string. At the stopped pump acid is supplied to the pipe string with filters, flushed by process water under pressure 0.5-1.0 from pressure of hydraulic fracturing of rocks and in volume not less than that of the pipe string, through which the acid is injected. After reaction of acid with rock, via same string, reaction products are extracted until oil appears, then pump is set into operation in horizontal shaft. If an oil flow rate by more than 50 % of oil flow rate after acid treatment of the process of pumping of acid is repeated with 1.1-2.0 times increase in injection acid volume in comparison with pumping of acid in the previous cycle.

EFFECT: increasing oil recovery of inhomogeneous carbonate reservoir.

1 cl, 1 dwg