| 摘要 |
A polymer is disclosed which is represented by the formula <IMAGE> wherein: Y is hydrogen, ammonium, an alkali metal or an alkaline earth metal; R1 and R2 are independently hydrogen, hydroxyl, amino, nitro, sulfo, phospho, carboxy, carboxyamido groups or hydrocarbon groups of 1 to about 20 carbon atoms; R3 is hydrogen or a hydrocarbon group of from 1 to about 12 carbon atoms; R4 and R5 are independently hydrogen or alkyl groups of 1 to about 3 carbon atoms; m is a number sufficient to provide the acid or salt portion of said polymer at a level of from zero to about 90% by weight of the total weight of said polymer; n is a number sufficient to provide the amide portion of said polymer at a level of from about 10% to about 99.5% by weight of the total weight of said polymer; p is a number sufficient to provide the maleimide portion of said polymer at a level of at least about 0.2% by weight of the total weight of said polymer; and x is a number sufficient to provide said polymer with a molecular weight of at least about 100,000. A method for recovering oil from a subterranean formation comprising injecting into said formation an aqueous composition comprising a thickening amount of the foregoing polymer is also disclosed.
|
