METHOD FOR EVEN SUPPLY OF LIQUID REAGENT INTO WELL Russian patent published in 2010 - IPC E21B37/06 E21B41/02 E21B47/10 

FIELD: oil and gas production.

SUBSTANCE: invention relates to oil producing industry, in particular to delivery of reagent into well and its supply into flow of bed fluid for prevention of corrosion, deposition of salts and paraffins in depth pump equipment. Method includes energising dosing pump and pumping of reagent from storage tank via feeder into well. Dosing pump is energised either from autonomous source arranged below or inside submersible electric motor (SEM) or by means of power takeoff from shaft of SEM or from coil additionally installed in SEM stator or from surface along cable. Liquid reagent is supplied to inlet of electric centrifugal pump set (ECPS). Reservoir for storage of reagent and dosing pump are fixed on ECPS below SEM. Reservoir has at least two holes, one of which is intended for supply of reagent into well, the other one - to pump bed fluid inside reservoir.

EFFECT: reduced consumption of reagent and increased overhaul period of wells operation due to even and efficient withdrawal of reagent into well.