Patent ID: 10914150

Abstract:
In a dual injection method for hydrocarbon reservoir management, a production well is formed from a surface of a subterranean hydrocarbon reservoir to a hydrocarbon-bearing zone in the reservoir. A first injection well and a second injection well are formed from the surface to a first depth and a second depth, respectively, in a water-bearing zone below the hydrocarbon-bearing zone, the second depth shallower than the first depth. A first injectant of a first type and a second injectant of a second type injected into the water-bearing zone through the first injection well and the second injection well, respectively. The second injectant is injected to sweep hydrocarbons in the hydrocarbon-bearing zone toward the production well. The first injectant is injected to sweep the second injectant toward the hydrocarbon-bearing zone. At least a portion of the hydrocarbons in the hydrocarbon-bearing zone are produced through the production well.