METHOD FOR SECONDARY OPENING OF PRODUCTIVE BED Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: according to method, productive bed is closed by impermeable shell which tightly adjoins walls of well. This shell is chemically destructible. Then, lowered into well by string of casing pipes is filter having pipe connections telescopically extending into productive bed interval. Introduced into casing string is plug with destructible diaphragm. Diaphragm is pressure-forced downwards by means of chemically destructible viscous-resilient liquid. Volume of this liquid must be sufficient for filling up filtration holes. Casing string is subjected to cementation. Telescopic pipe connections of filter are extended. Extending operation is continued until end faces of pipe connections come in contact with chemically destructible impermeable shell. This method can be applied in oil and gas wells. It prevents contact of cement slurry with rock of productive bed. EFFECT: higher efficiency. 4 dwg