METHOD OF SUPPLYING REAGENTS INTO FLOWING GAS-CONDENSATE WELL Russian patent published in 2001 - IPC

FIELD: oil producing industry; applicable in supply of corrosion inhibitor into flowing wells for protection of pipes from corrosion. SUBSTANCE: method involves regulation of passage time of reagent through annular space for formation of protective film. Time of passage of reagent is regulated by injection of displacing fluid. Amount of reagent is determined by its total consumption for formation of protective film on internal surface of casing pipes. Total consumption value includes losses for dissolving and mixing of reagent with formation products, with its subsequent withdrawal from well. Time of reagent passage along annular space shall not be less than that required for formation of protective film on internal surface of casing string and on external surface of tubing string. Time of reagent passage through tubing string together with carried from bottom-hole formation shall not be less than that needed for formation of protective film on its internal surfaces. Time of reagent passage through tubing string is regulated by volume of withdrawal of formation products. Density of mixture of formation products and reagent shall not exceed rated value. EFFECT: reduced consumption of reagent, prevented spontaneous killing of well in injection of corrosion inhibitor into flowing gas-condensate well.