Abstract: A system and method for extracting a resource from a reservoir repeatedly alternates between injecting a fluid and injecting a gas into the reservoir. A rate and/or an amount of each of the fluid and the gas that is injected into the reservoir is defined by a first fluid-and-gas ratio function that designates different ratios as a function of time. The ratios designate the rate and/or the amount of the fluid that is injected into the reservoir to the rate and/or the amount of the gas that is injected into the reservoir. The rate and/or the amount at which the fluid and/or the gas is injected into the reservoir is changed according to the ratios designated by the first fluid-and-gas ratio function as time progresses.

Abstract: System includes one or more processors that are configured to perform iterations of the following until a predetermined condition is satisfied. The one or more processors are configured to select a modified trial schedule. The modified trial schedule is selected based on initial fluid-extraction data and initial trial schedules and, if available, prior modified trial schedules and prior modified fluid-extraction data from prior iterations. The one or more processors are configured to receive modified fluid-extraction data generated by execution of the modified trial schedule with a designated model of the reservoir. The one or more processors are also configured to update the surrogate model with the modified fluid-extraction data and the modified trial schedule. For at least a plurality of the iterations, the modified trial schedule is selected, at least in part, to reduce uncertainty in a sample space as characterized by the surrogate model.

Abstract: A method includes a first injection phase that includes injecting a first gas-based fluid into a subterranean formation at a first pressure that exceeds a fracture pressure of the subterranean formation. The method also includes a second injection phase that includes injecting a second gas-based fracturing fluid into the subterranean formation at a second pressure that exceeds a minimum miscibility pressure of the second gas-based fluid, followed by a shut in period. The method further includes a third injection phase that includes injecting the first gas-based fluid or a third gas-based fluid into the subterranean formation at the first fracture pressure or at a third pressure exceeding the fracture pressure of the subterranean formation. The first gas-based fluid, second gas-based fluid, and third gas-based fluid include carbon dioxide (CO2).

Abstract: System includes one or more processors that are configured to perform iterations of the following until a predetermined condition is satisfied. The one or more processors are configured to select a modified trial schedule. The modified trial schedule is selected based on initial fluid-extraction data and initial trial schedules and, if available, prior modified trial schedules and prior modified fluid-extraction data from prior iterations. The one or more processors are configured to receive modified fluid-extraction data generated by execution of the modified trial schedule with a designated model of the reservoir. The one or more processors are also configured to update the surrogate model with the modified fluid-extraction data and the modified trial schedule. For at least a plurality of the iterations, the modified trial schedule is selected, at least in part, to reduce uncertainty in a sample space as characterized by the surrogate model.

Abstract: The disclosed method comprises a first injection phase that comprises injecting a first gas-based fluid into a subterranean formation at a first pressure that exceeds a fracture pressure of the subterranean formation. A second injection phase occurs that comprises injecting a second gas-based fracturing fluid into the subterranean formation at a second pressure that exceeds a minimum miscibility pressure of the second gas-based fluid, followed by a shut in period. A third injection phase is performed that comprises injecting the first gas-based fluid or a third gas-based fluid into the subterranean formation at the first fracture pressure or at a third pressure exceeding the fracture pressure of the subterranean formation. In one embodiment, the first gas-based fluid, second gas-based fluid, and third gas-based fluid comprise carbon dioxide (CO2).

Abstract: A system and method for extracting a resource from a reservoir repeatedly alternates between injecting a fluid and injecting a gas into the reservoir. A rate and/or an amount of each of the fluid and the gas that is injected into the reservoir is defined by a first fluid-and-gas ratio function that designates different ratios as a function of time. The ratios designate the rate and/or the amount of the fluid that is injected into the reservoir to the rate and/or the amount of the gas that is injected into the reservoir. The rate and/or the amount at which the fluid and/or the gas is injected into the reservoir is changed according to the ratios designated by the first fluid-and-gas ratio function as time progresses.