INTERVAL ISOLATION METHOD OF BRINE WATER INFLUX IN HORIZONTAL WELLS Russian patent published in 2014 - IPC E21B43/32 E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: method includes running in of a flexible coiled tubing, filling of the well with blocking fluid in the interval from the bottomhole up to the lower part of water influx closest to the bottomhole. Water-shutoff compound is injected and flushed to the producing formation with simultaneous running out of the flexible coiled tubing up to the upper part of water influx closest to the bottomhole. At that the rate of the well horizontal section should be several times more than the rate of the flexible coiled tubing movement in order to ensure even placement of water-shutoff compound in the producing formation. The well horizontal section is filled with blocking fluid up to the next water influx shutoff interval and isolation works are performed in sequence at each influx interval starting from the interval closest to the bottomhole. Upon isolation of the last water influx the well is closed under pressure for reaction of water shutoff elements and destruction of the blocking fluid. Thereafter the flexible tubing is run in up to the bottomhole and the well is washed in volume of at least 2 circulation cycles.

EFFECT: increased shutoff efficiency of brine water influx in horizontal wells both with cased bottomhole and open bottmhole with a slotted liner or without it.

6 dwg