WELL INHIBITION METHOD Russian patent published in 2020 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for inhibitory protection of tubing and underground equipment of well, including at development of wells with low reservoir pressure. When implementing the method, prior to supplying the inhibitor to the well, work on cleaning the tubing string is performed by feeding gaseous nitrogen into it until steady pressure is established at the wellhead. Supply of the inhibitor to the well is performed in the sprayed form with flow of gaseous nitrogen, and after completion of the inhibitor supply the supply of gaseous nitrogen is continued in the volume equal to or greater than spent for cleaning of the production tubing string until the inhibitor is completely displaced into the bottomhole zone of the well. After supply of gaseous nitrogen, the well is maintained in idle mode for at least 24 hours to ensure adsorption of corrosion inhibitor into the bottomhole formation zone. Well start-up into operation directly in the flowline of well pipeline at operating mode.

EFFECT: reliable corrosion protection, reduced negative effect of excess pressure of hydrostatic column of inhibitor on productive formation, excluding further performance of additional works on intensification of well inflow and its idle time, reduction of losses of well flow rate after performance of works on inhibition.

1 cl, 2 tbl