| 摘要 |
Prevention of inflow of water into the wells or shafts which are already drilled or are being drilled, by means of a polyacrylamide gel cross-linked with a dialdehyde is disclosed. An aqueous solution of non-hydrolyzed polyacrylamide, with a molecular weight higher than 2,000,000 and with a pH of at least 6.5, is used. A progressive plugging or clogging of the water-productive zone is obtained and the gel which is formed is stable over time and does not undergo any syneresis. |
