| 摘要 |
A drilling fluid is provided that comprises a non-ionic or cationic polymer having general formulae I or II. The drilling fluid may be used in drilling or other oilfield operations to prevent or limit the accretion of hydrocarbons to metal components when these are in contact with highly viscous hydrocarbons such as those present in formations containing heavy crude oil or tar sand. (see formula I) (see formula II) |
