| 摘要 |
Residual oil remaining in geological deposits is recovered by pumping through the deposit an aqueous solution comprising a polymeric material, such as polyacrylamide, and alkali, such as soda ash (Na2CO3). The concentration of the polymeric material is such that the viscosity of the aqueous solution is at least about 50% the viscosity of oil. The concentration of alkali is adjusted to a value which will produce an approximate minimum value for the interfacial tension between the aqueous solution and crude oil which is less than 0.1 dyne/cm. |
