RECOVERY OF SELF-SQUEEZING GAS WELL WITH ABNORMALLY LOW SEAM PRESSURE Russian patent published in 2015 - IPC E21B43/00 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to recovery of said well located at multihorizon field. Proposed process comprises injection of isolating composition via well tubing string and fitting of "liquid" packer below tubing string shoe. Then, flow tubing above "liquid" packer is filled with killing fluid. Tubing string is withdrawn from the well. Deflector wedge is fitted inside tubing string. Lateral opening is cut in tubing string above overlaying high-pressure productive bed. Side hole is bored through said bed to extend through its entire depth to make side hole face occur nearby said high-pressure productive bed. Casing string with filter is lowered into bored side hole. Casing string is cemented above filter to the roof of top high-pressure productive bed and said wedge is withdrawn. Hanger with latch joint arranged at its inner surface is lowered on temporary string. Said hanger is fitted inside flow string under side opening. Oil string provided with side opening is lowered into flow string till interaction with latch device so that side openings of both strings are located opposite each other. Then, influx from lateral hole is initiated to remove killing fluid from the well. Then, liner with centring funnel at its shoe and packer hanger at its top is lowered on flexible pipe inside oil string to "liquid" packer. Solvent is injected via said liner. Said solvent destructs said "liquid" packer its residues falling on the face. Now liner is lowered to bottom holes of perforation interval of the bottom low-pressure productive bed. Liner is suspended in oil string above side opening of oil string. Flexible pipe is withdrawn from the well to place the well in operation.

EFFECT: efficient recovery.

7 dwg