PROCESSING METHOD OF CARBONATE OIL RESERVOIR Russian patent published in 2017 - IPC E21B43/32 E21B43/27 

FIELD: petroleum industry.

SUBSTANCE: invention refers to the petroleum industry and may be used during the acid processing of carbonate oil reservoirs with the water-oil contact in the wells with open horizontal shafts. According to the method, a well is performed or selected with the open shaft in a production carbonate reservoir. In this well, the sites of at least 2 m long are selected for processing. The acid processing is performed. For this purpose, a flexible coupling-free pipe with the paired packers on its end and the hydromonitor nozzle between the packers is descended into the shaft. After the descent of these pipes with packers and hydromonitor nozzles into the corresponding site, the packers are puckered. The solution of surface-active substance in the set volume is pumped through these flexible coupling-free pipes and hydromonitor nozzles. The soak period is performed. Then, a gel is pumped, which is selected according to the condition of impossibility of its pumping into a reservoir at a pressure, at which the acid will be pumped later, as well as capable for thickening after some period of time following its pumping into the open shaft of a well. The soak period is performed within the time required for subsidence of the gel into the bottom part of the shaft and its thickening. After that, the acid is pumped under pressure. The soak period is performed for the reaction of the acid solution with the reservoir. Then, the gel solvent is pumped into the well in the volume of at least equal to the volume of the pumped gel. The horizontal shaft of the well is washed; the packers are unpackered and remove from the well, as well as the flexible coupling-free pipe with the hydromonotor nozzle and packers.

EFFECT: increasing of process efficiency of the acid processing.

1 dwg, 1 ex