| 摘要 |
The invention relates to a method for liquidation of inter-pipe and annular gas flow in wells of gas, gas-condensate and oil-gas-condensate beds. The method includes geo-physical investigations and treatment of annular space by method of “slide plugging” with plugging solution with following blowing with gas and pumping in water solution of chlorides of calcium and/or magnesium to annular space. On pumps in to annular space in fluid and hot state at temperature 80-90 °C sealing composition as solution of saponified tall oil pitch in diethyleneglycol or its worked-out analog and additionally 0.5-2.0 % of surface-active substance of non-ionic type (from group neonol AF9-(4÷6), ES-2, twin-80, ripox-6, savenol-NWP, savenol-SWP, naftochim-1, phosphatidine) or cationic type (from group cationic fat, oleodine), and sealing compositions with low viscosity are held in annular space in process of “sliding plugging” for gel plug with high cohesion strength that is suspension of fine-disperse water-swelling polymer in gel solution of acryl polymer (polyacrylamide, hydrolyzed polyacrylonitrile, carboxymethylcellulose) or structured invert emulsion on basis of oil-fat concentrates. Increase of reliability, strength and durability of gas-conductive sections is provided. |
