METHOD FOR HORIZONTAL WELL OPERATION Russian patent published in 2012 - IPC E21B43/00 E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, a well is operated until water intrusion of production. A pipe string is lowered into a horizontal part of the well, and the annular space is filled with a cement mortar, the cement mortar is squeezed into a borehole environment via the pipe string, and squeezing is stopped, when pressures in the pipe string and the annular space are balanced, the process exposure is carried out for cement setting and hardening, the pipe string is cleaned from cement remains. The process exposure is carried out for at least 3 months with periodical research of the borehole environment with a pulse neutron generator. The process exposure is stopped after readings of the pulse neutron generator are stabilised. Using the readings of the pulse neutron generator, oil zones of a horizontal bore are identified. Oil zones are perforated from the remote end of the horizontal bore to the wellhead. Oil is withdrawn until water intrusion into a zone, the watered zone is isolated, and oil withdrawal continues.

EFFECT: higher efficiency of water inflow isolation in a horizontal bore of a producing well due to increased reliability of a blocking effect with controlled directed impact at zones of bed water inflow.

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