| 摘要 |
A method for controlling the permeability profile of a subterranean oil-bearing formation utilizing polymeric gel-forming compositions which gel in-situ. The method comprises the steps of determining an amount of polymeric gel required for profile control; introducing a first aqueous gel-forming composition in a non-gelatinous state into the formation in an amount which is a portion of the total gel requirement; and, introducing into the formation in a non-gelatinous state at least a second aqueous composition capable of forming a gel at a rate in excess of the first gel-forming composition wherein the gelation of all compositions proceeds in timed relation such that each solution gels at approximately the same time. The method so described reduces reservoir shut-in time and is especially useful in the treatment of large reservoirs.
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