FIELD: oil and gas production.
SUBSTANCE: in compliance with proposed method, top section of production tubing is cut and extracted. Permanent cement plug is fitted in well flooded parent hole. Opening is cut above said plug in parent hole production tubing and extra hole is drilled not extending beyond parent hole of flooded well bottom zone to arrange shoe 2-3 mm above gas-water contact (GWC). Said extra hole is cased by casing liner and cemented. Said liner is perforated some 5-7 m above GWC to produce water-shutoff holes. Water-shutoff agent if injected via said holes to displace water down into bed to make water-shutoff shield. Water-shutoff composition forced through process holes for water-shutoff is made up by plasticised oil-well cement composition with increased penetrating capacity. Water-shutoff cement bridging from oil-well normal-density cement is arranged in liner to cover aforesaid process holes. After cement curing and testing cement bridging for strength and tightness, liner is perforated at productive bed top section to develop the well.
EFFECT: additional production of gas at minimum repair costs.
3 ex, 1 dwg
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