METHOD FOR FLOW STRING PRESSURE-TESTING IN INJECTION WELL Russian patent published in 2008 - IPC E21B47/00 

FIELD: survey of boreholes or wells, particularly pressure-testing of injection well equipped with flow string.

SUBSTANCE: method involves providing well shutdown and well hookup; arranging seat for plug receiving in lower flow string part; providing flow string with lubricator at well head, wherein the lubricator has trap at upper lubricator end; dropping plug with socket for catcher receiving in flow string before flow string bottom plugging via lubricator; wherein the socket is arranged from upper side thereof; circulating liquid via flow string and hole annuity to move the plug downwards and arranging the plug in seat to plug flow string; increasing pressure in flow string and recording pressure change; providing reverse liquid circulation and lifting the plug by upward flow via flow string; providing flow velocity enough to bypass place of liquid taking from lubricator, lubricator catcher reaching by plug and plug fixation in catcher.

EFFECT: simplified pressure-testing.

1 ex, 1 dwg