HORIZONTAL WELL COMPLETION METHOD Russian patent published in 2016 - IPC E21B43/27 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used for intensification of oil production from producing carbonate formations penetrated by wells with open horizontal shafts. Horizontal well completion method consists in lowering production string with starting clutches and with a funnel at end, arrangement of a funnel in range of shoe of production string, lowering flexible flush-joint pipe with jet nozzle at end inside tubing string, input of jet nozzle in horizontal well uncased and arrangement at bottom hole, at open tube valve at wellhead pumping of acid solution with creation of flow rate providing effect of "cutting" rock at open casing valve at flush-joint pipe filling borehole water solution of surfactant, closing of casing valve and forcing-through solution of surface active substance at flush-joint pipe to formation, closing valve on tube space of flexible flush-joint pipe, at closed annular and tube space through annular space acid solution is flushed in well bore, in formation with stepped pressure rise and exposure at each stage, process withhold for purpose of acid reaction with rock, washing well shaft, lifting of flexible flush-joint pipe of well, pumping of inert gas through annular space with extraction of liquid via tubing string, pumping of liquid into well killing, development of well. Wherein in horizontal bore is placed an assembly with bit, equal to diameter of horizontal shaft with drive, horizontal borehole is washed with rotation and reciprocation arrangement of direct flushing with 0.1-0.3 % solution of surfactant in formation water in volume not less than 25 m³ to clean water, assembly is lifted in vertical borehole and held for 30 minutes, then horizontal borehole is gauged by assembly to face. Pumping of acid through flexible flush-joint pipe is carried out at pressure not less than 20 MPa and flow rate of not less than 3 l/s.

EFFECT: high efficiency of acid treatment of well due to creation of hydrodynamic communication with interlayers not exposed to acid effect.

1 cl, 1 ex