METHOD FOR FLUSHING OF PROPPANT PLUG IN GAS OR GAS-CONDENSATE WELL ON COMPLETION OF HYDRAULIC RUPTURE OF BED Russian patent published in 2009 - IPC E21B37/00 

FIELD: oil and gas production.

SUBSTANCE: invention is related to oil and gas production industry, in particular to technologies for flushing of proppant plugs of high thickness. Method includes stepwise lowering of flexible pipe in process of flushing with the rate of 0.1 m/sec, flushing of well bore and stepped deepening of flexible pipe at the depth of 1-3 m with a rate of 0.001 m/sec with permanent supply of aerated flushing liquid and with maintenance of 100 % circulation output from well at each stage of flexible pipe deepening. At each stage at least two cycles of circulation are carried out. Minimum difference is maintained between pressure of flushing liquid column in annular space and pressure of this liquid absorption with a hydraulic rupture crack with the help of an external source of gaseous agent in the form of compressor and nitrogen-booster plant in complex with the remaining equipment.

EFFECT: improved efficiency of flushing, provision of process parametre control.

1 dwg